From 0244d84f4c13e9a5aea302f7d679a5b6216708a2 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 21 Aug 2013 14:27:05 +0300 Subject: acpi-dma, doc: append managed function to the list ACPI DMA provides managed function to register the slave DMA controller in the internal container. This patch anounces that function in the corresponding documentation file. Signed-off-by: Andy Shevchenko Cc: Rob Landley Signed-off-by: Vinod Koul --- Documentation/driver-model/devres.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation') diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index b4671459857f..2850110b343a 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -293,3 +293,6 @@ PWM PHY devm_usb_get_phy() devm_usb_put_phy() + +SLAVE DMA ENGINE + devm_acpi_dma_controller_register() -- cgit v1.2.3 From dcfec3c09890120d86d4e86887074c76763075ca Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 20 Aug 2013 10:04:32 +0200 Subject: dma: imx-sdma: Add ROM script addresses to driver This adds the ROM script addresses for i.MX25, i.MX5x and i.MX6 to the SDMA driver needed for the driver to work without additional firmware. The ROM script addresses are SoC specific and in some cases even tapeout specific. This patch adds the ROM script addresses only for SoCs which do not have a tapeout specific SDMA ROM, because currently it's unclear how this case should be handled. Signed-off-by: Sascha Hauer Acked-by: Shawn Guo Signed-off-by: Vinod Koul --- .../devicetree/bindings/dma/fsl-imx-sdma.txt | 7 +- drivers/dma/imx-sdma.c | 100 ++++++++++++++++++++- 2 files changed, 105 insertions(+), 2 deletions(-) (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt index 68cee4f5539f..4fa814d38321 100644 --- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt +++ b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt @@ -1,7 +1,12 @@ * Freescale Smart Direct Memory Access (SDMA) Controller for i.MX Required properties: -- compatible : Should be "fsl,-sdma" +- compatible : Should be "fsl,imx31-sdma", "fsl,imx31-to1-sdma", + "fsl,imx31-to2-sdma", "fsl,imx35-sdma", "fsl,imx35-to1-sdma", + "fsl,imx35-to2-sdma", "fsl,imx51-sdma", "fsl,imx53-sdma" or + "fsl,imx6q-sdma". The -to variants should be preferred since they + allow to determnine the correct ROM script addresses needed for + the driver to work without additional firmware. - reg : Should contain SDMA registers location and length - interrupts : Should contain SDMA interrupt - #dma-cells : Must be <3>. diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index e62be230d2fc..59bf9f59fcaa 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -308,6 +308,7 @@ struct sdma_firmware_header { struct sdma_driver_data { int chnenbl0; int num_events; + struct sdma_script_start_addrs *script_addrs; }; struct sdma_engine { @@ -331,18 +332,110 @@ struct sdma_driver_data sdma_imx31 = { .num_events = 32, }; +static struct sdma_script_start_addrs sdma_script_imx25 = { + .ap_2_ap_addr = 729, + .uart_2_mcu_addr = 904, + .per_2_app_addr = 1255, + .mcu_2_app_addr = 834, + .uartsh_2_mcu_addr = 1120, + .per_2_shp_addr = 1329, + .mcu_2_shp_addr = 1048, + .ata_2_mcu_addr = 1560, + .mcu_2_ata_addr = 1479, + .app_2_per_addr = 1189, + .app_2_mcu_addr = 770, + .shp_2_per_addr = 1407, + .shp_2_mcu_addr = 979, +}; + +struct sdma_driver_data sdma_imx25 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx25, +}; + struct sdma_driver_data sdma_imx35 = { .chnenbl0 = SDMA_CHNENBL0_IMX35, .num_events = 48, }; +static struct sdma_script_start_addrs sdma_script_imx51 = { + .ap_2_ap_addr = 642, + .uart_2_mcu_addr = 817, + .mcu_2_app_addr = 747, + .mcu_2_shp_addr = 961, + .ata_2_mcu_addr = 1473, + .mcu_2_ata_addr = 1392, + .app_2_per_addr = 1033, + .app_2_mcu_addr = 683, + .shp_2_per_addr = 1251, + .shp_2_mcu_addr = 892, +}; + +struct sdma_driver_data sdma_imx51 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx51, +}; + +static struct sdma_script_start_addrs sdma_script_imx53 = { + .ap_2_ap_addr = 642, + .app_2_mcu_addr = 683, + .mcu_2_app_addr = 747, + .uart_2_mcu_addr = 817, + .shp_2_mcu_addr = 891, + .mcu_2_shp_addr = 960, + .uartsh_2_mcu_addr = 1032, + .spdif_2_mcu_addr = 1100, + .mcu_2_spdif_addr = 1134, + .firi_2_mcu_addr = 1193, + .mcu_2_firi_addr = 1290, +}; + +struct sdma_driver_data sdma_imx53 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx53, +}; + +static struct sdma_script_start_addrs sdma_script_imx6q = { + .ap_2_ap_addr = 642, + .uart_2_mcu_addr = 817, + .mcu_2_app_addr = 747, + .per_2_per_addr = 6331, + .uartsh_2_mcu_addr = 1032, + .mcu_2_shp_addr = 960, + .app_2_mcu_addr = 683, + .shp_2_mcu_addr = 891, + .spdif_2_mcu_addr = 1100, + .mcu_2_spdif_addr = 1134, +}; + +struct sdma_driver_data sdma_imx6q = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx6q, +}; + static struct platform_device_id sdma_devtypes[] = { { + .name = "imx25-sdma", + .driver_data = (unsigned long)&sdma_imx25, + }, { .name = "imx31-sdma", .driver_data = (unsigned long)&sdma_imx31, }, { .name = "imx35-sdma", .driver_data = (unsigned long)&sdma_imx35, + }, { + .name = "imx51-sdma", + .driver_data = (unsigned long)&sdma_imx51, + }, { + .name = "imx53-sdma", + .driver_data = (unsigned long)&sdma_imx53, + }, { + .name = "imx6q-sdma", + .driver_data = (unsigned long)&sdma_imx6q, }, { /* sentinel */ } @@ -350,8 +443,11 @@ static struct platform_device_id sdma_devtypes[] = { MODULE_DEVICE_TABLE(platform, sdma_devtypes); static const struct of_device_id sdma_dt_ids[] = { - { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, }, + { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, }, + { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, }, + { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, }, { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, }, + { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sdma_dt_ids); @@ -1424,6 +1520,8 @@ static int __init sdma_probe(struct platform_device *pdev) if (ret) goto err_init; + if (sdma->drvdata->script_addrs) + sdma_add_scripts(sdma, sdma->drvdata->script_addrs); if (pdata && pdata->script_addrs) sdma_add_scripts(sdma, pdata->script_addrs); -- cgit v1.2.3 From 4981c4dc194efb18f0e9a02f1b43e926f2f0d2bb Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Fri, 2 Aug 2013 16:50:36 +0200 Subject: DMA: shdma: switch DT mode to use configuration data from a match table This facilitates DMAC DT support by eliminating the need in AUXDATA and avoiding creating complex DT data. This also fits well with DMAC devices, of which SoCs often have multiple identical copies and it is perfectly valid to use a single configuration data set for all of them. Signed-off-by: Guennadi Liakhovetski Signed-off-by: Vinod Koul --- Documentation/devicetree/bindings/dma/shdma.txt | 61 +- drivers/dma/sh/Makefile | 2 + drivers/dma/sh/shdma-base.c | 15 +- drivers/dma/sh/shdma-of.c | 3 - drivers/dma/sh/shdma.c | 944 ----------------------- drivers/dma/sh/shdma.h | 1 + drivers/dma/sh/shdmac.c | 952 ++++++++++++++++++++++++ drivers/dma/sh/sudmac.c | 3 +- include/linux/shdma-base.h | 2 +- 9 files changed, 1002 insertions(+), 981 deletions(-) delete mode 100644 drivers/dma/sh/shdma.c create mode 100644 drivers/dma/sh/shdmac.c (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/dma/shdma.txt b/Documentation/devicetree/bindings/dma/shdma.txt index c15994aa1939..2a3f3b8946b9 100644 --- a/Documentation/devicetree/bindings/dma/shdma.txt +++ b/Documentation/devicetree/bindings/dma/shdma.txt @@ -22,42 +22,51 @@ Optional properties (currently unused): * DMA controller Required properties: -- compatible: should be "renesas,shdma" +- compatible: should be of the form "renesas,shdma-", where should + be replaced with the desired SoC model, e.g. + "renesas,shdma-r8a73a4" for the system DMAC on r8a73a4 SoC Example: - dmac: dma-mux0 { + dmac: dma-multiplexer@0 { compatible = "renesas,shdma-mux"; #dma-cells = <1>; - dma-channels = <6>; + dma-channels = <20>; dma-requests = <256>; - reg = <0 0>; /* Needed for AUXDATA */ - #address-cells = <1>; - #size-cells = <1>; + #address-cells = <2>; + #size-cells = <2>; ranges; - dma0: shdma@fe008020 { - compatible = "renesas,shdma"; - reg = <0xfe008020 0x270>, - <0xfe009000 0xc>; + dma0: dma-controller@e6700020 { + compatible = "renesas,shdma-r8a73a4"; + reg = <0 0xe6700020 0 0x89e0>; interrupt-parent = <&gic>; - interrupts = <0 34 4 - 0 28 4 - 0 29 4 - 0 30 4 - 0 31 4 - 0 32 4 - 0 33 4>; + interrupts = <0 220 4 + 0 200 4 + 0 201 4 + 0 202 4 + 0 203 4 + 0 204 4 + 0 205 4 + 0 206 4 + 0 207 4 + 0 208 4 + 0 209 4 + 0 210 4 + 0 211 4 + 0 212 4 + 0 213 4 + 0 214 4 + 0 215 4 + 0 216 4 + 0 217 4 + 0 218 4 + 0 219 4>; interrupt-names = "error", "ch0", "ch1", "ch2", "ch3", - "ch4", "ch5"; - }; - - dma1: shdma@fe018020 { - ... - }; - - dma2: shdma@fe028020 { - ... + "ch4", "ch5", "ch6", "ch7", + "ch8", "ch9", "ch10", "ch11", + "ch12", "ch13", "ch14", "ch15", + "ch16", "ch17", "ch18", "ch19"; }; }; diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile index c962138dde96..893ee095f93c 100644 --- a/drivers/dma/sh/Makefile +++ b/drivers/dma/sh/Makefile @@ -1,3 +1,5 @@ obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o obj-$(CONFIG_SH_DMAE) += shdma.o +shdma-y := shdmac.o +shdma-objs := $(shdma-y) obj-$(CONFIG_SUDMAC) += sudmac.o diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c index c5ea256c2819..d94ab592cc1b 100644 --- a/drivers/dma/sh/shdma-base.c +++ b/drivers/dma/sh/shdma-base.c @@ -171,7 +171,8 @@ static struct shdma_desc *shdma_get_desc(struct shdma_chan *schan) return NULL; } -static int shdma_setup_slave(struct shdma_chan *schan, int slave_id) +static int shdma_setup_slave(struct shdma_chan *schan, int slave_id, + dma_addr_t slave_addr) { struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); const struct shdma_ops *ops = sdev->ops; @@ -179,7 +180,7 @@ static int shdma_setup_slave(struct shdma_chan *schan, int slave_id) if (schan->dev->of_node) { match = schan->hw_req; - ret = ops->set_slave(schan, match, true); + ret = ops->set_slave(schan, match, slave_addr, true); if (ret < 0) return ret; @@ -194,7 +195,7 @@ static int shdma_setup_slave(struct shdma_chan *schan, int slave_id) if (test_and_set_bit(slave_id, shdma_slave_used)) return -EBUSY; - ret = ops->set_slave(schan, match, false); + ret = ops->set_slave(schan, match, slave_addr, false); if (ret < 0) { clear_bit(slave_id, shdma_slave_used); return ret; @@ -236,7 +237,7 @@ bool shdma_chan_filter(struct dma_chan *chan, void *arg) if (!schan->dev->of_node && match >= slave_num) return false; - ret = ops->set_slave(schan, match, true); + ret = ops->set_slave(schan, match, 0, true); if (ret < 0) return false; @@ -259,7 +260,7 @@ static int shdma_alloc_chan_resources(struct dma_chan *chan) */ if (slave) { /* Legacy mode: .private is set in filter */ - ret = shdma_setup_slave(schan, slave->slave_id); + ret = shdma_setup_slave(schan, slave->slave_id, 0); if (ret < 0) goto esetslave; } else { @@ -680,7 +681,9 @@ static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, * channel, while using it... */ config = (struct dma_slave_config *)arg; - ret = shdma_setup_slave(schan, config->slave_id); + ret = shdma_setup_slave(schan, config->slave_id, + config->direction == DMA_DEV_TO_MEM ? + config->src_addr : config->dst_addr); if (ret < 0) return ret; break; diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c index 11bcb05cd79c..2acf7b62d6b6 100644 --- a/drivers/dma/sh/shdma-of.c +++ b/drivers/dma/sh/shdma-of.c @@ -45,9 +45,6 @@ static int shdma_of_probe(struct platform_device *pdev) const struct of_dev_auxdata *lookup = pdev->dev.platform_data; int ret; - if (!lookup) - return -EINVAL; - ret = of_dma_controller_register(pdev->dev.of_node, shdma_of_xlate, pdev); if (ret < 0) diff --git a/drivers/dma/sh/shdma.c b/drivers/dma/sh/shdma.c deleted file mode 100644 index 3b4bee933dd7..000000000000 --- a/drivers/dma/sh/shdma.c +++ /dev/null @@ -1,944 +0,0 @@ -/* - * Renesas SuperH DMA Engine support - * - * base is drivers/dma/flsdma.c - * - * Copyright (C) 2011-2012 Guennadi Liakhovetski - * Copyright (C) 2009 Nobuhiro Iwamatsu - * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. - * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. - * - * This is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * - DMA of SuperH does not have Hardware DMA chain mode. - * - MAX DMA size is 16MB. - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "../dmaengine.h" -#include "shdma.h" - -#define SH_DMAE_DRV_NAME "sh-dma-engine" - -/* Default MEMCPY transfer size = 2^2 = 4 bytes */ -#define LOG2_DEFAULT_XFER_SIZE 2 -#define SH_DMA_SLAVE_NUMBER 256 -#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1) - -/* - * Used for write-side mutual exclusion for the global device list, - * read-side synchronization by way of RCU, and per-controller data. - */ -static DEFINE_SPINLOCK(sh_dmae_lock); -static LIST_HEAD(sh_dmae_devices); - -/* - * Different DMAC implementations provide different ways to clear DMA channels: - * (1) none - no CHCLR registers are available - * (2) one CHCLR register per channel - 0 has to be written to it to clear - * channel buffers - * (3) one CHCLR per several channels - 1 has to be written to the bit, - * corresponding to the specific channel to reset it - */ -static void channel_clear(struct sh_dmae_chan *sh_dc) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_dc); - const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel + - sh_dc->shdma_chan.id; - u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0; - - __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset); -} - -static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) -{ - __raw_writel(data, sh_dc->base + reg); -} - -static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) -{ - return __raw_readl(sh_dc->base + reg); -} - -static u16 dmaor_read(struct sh_dmae_device *shdev) -{ - void __iomem *addr = shdev->chan_reg + DMAOR; - - if (shdev->pdata->dmaor_is_32bit) - return __raw_readl(addr); - else - return __raw_readw(addr); -} - -static void dmaor_write(struct sh_dmae_device *shdev, u16 data) -{ - void __iomem *addr = shdev->chan_reg + DMAOR; - - if (shdev->pdata->dmaor_is_32bit) - __raw_writel(data, addr); - else - __raw_writew(data, addr); -} - -static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_dc); - - __raw_writel(data, sh_dc->base + shdev->chcr_offset); -} - -static u32 chcr_read(struct sh_dmae_chan *sh_dc) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_dc); - - return __raw_readl(sh_dc->base + shdev->chcr_offset); -} - -/* - * Reset DMA controller - * - * SH7780 has two DMAOR register - */ -static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) -{ - unsigned short dmaor; - unsigned long flags; - - spin_lock_irqsave(&sh_dmae_lock, flags); - - dmaor = dmaor_read(shdev); - dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); - - spin_unlock_irqrestore(&sh_dmae_lock, flags); -} - -static int sh_dmae_rst(struct sh_dmae_device *shdev) -{ - unsigned short dmaor; - unsigned long flags; - - spin_lock_irqsave(&sh_dmae_lock, flags); - - dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); - - if (shdev->pdata->chclr_present) { - int i; - for (i = 0; i < shdev->pdata->channel_num; i++) { - struct sh_dmae_chan *sh_chan = shdev->chan[i]; - if (sh_chan) - channel_clear(sh_chan); - } - } - - dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); - - dmaor = dmaor_read(shdev); - - spin_unlock_irqrestore(&sh_dmae_lock, flags); - - if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { - dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n"); - return -EIO; - } - if (shdev->pdata->dmaor_init & ~dmaor) - dev_warn(shdev->shdma_dev.dma_dev.dev, - "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", - dmaor, shdev->pdata->dmaor_init); - return 0; -} - -static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) -{ - u32 chcr = chcr_read(sh_chan); - - if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) - return true; /* working */ - - return false; /* waiting */ -} - -static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_chan); - const struct sh_dmae_pdata *pdata = shdev->pdata; - int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | - ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); - - if (cnt >= pdata->ts_shift_num) - cnt = 0; - - return pdata->ts_shift[cnt]; -} - -static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_chan); - const struct sh_dmae_pdata *pdata = shdev->pdata; - int i; - - for (i = 0; i < pdata->ts_shift_num; i++) - if (pdata->ts_shift[i] == l2size) - break; - - if (i == pdata->ts_shift_num) - i = 0; - - return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | - ((i << pdata->ts_high_shift) & pdata->ts_high_mask); -} - -static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) -{ - sh_dmae_writel(sh_chan, hw->sar, SAR); - sh_dmae_writel(sh_chan, hw->dar, DAR); - sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); -} - -static void dmae_start(struct sh_dmae_chan *sh_chan) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_chan); - u32 chcr = chcr_read(sh_chan); - - if (shdev->pdata->needs_tend_set) - sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); - - chcr |= CHCR_DE | shdev->chcr_ie_bit; - chcr_write(sh_chan, chcr & ~CHCR_TE); -} - -static void dmae_init(struct sh_dmae_chan *sh_chan) -{ - /* - * Default configuration for dual address memory-memory transfer. - * 0x400 represents auto-request. - */ - u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, - LOG2_DEFAULT_XFER_SIZE); - sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); - chcr_write(sh_chan, chcr); -} - -static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) -{ - /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ - if (dmae_is_busy(sh_chan)) - return -EBUSY; - - sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); - chcr_write(sh_chan, val); - - return 0; -} - -static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_chan); - const struct sh_dmae_pdata *pdata = shdev->pdata; - const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id]; - void __iomem *addr = shdev->dmars; - unsigned int shift = chan_pdata->dmars_bit; - - if (dmae_is_busy(sh_chan)) - return -EBUSY; - - if (pdata->no_dmars) - return 0; - - /* in the case of a missing DMARS resource use first memory window */ - if (!addr) - addr = shdev->chan_reg; - addr += chan_pdata->dmars; - - __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), - addr); - - return 0; -} - -static void sh_dmae_start_xfer(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - struct sh_dmae_desc *sh_desc = container_of(sdesc, - struct sh_dmae_desc, shdma_desc); - dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n", - sdesc->async_tx.cookie, sh_chan->shdma_chan.id, - sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar); - /* Get the ld start address from ld_queue */ - dmae_set_reg(sh_chan, &sh_desc->hw); - dmae_start(sh_chan); -} - -static bool sh_dmae_channel_busy(struct shdma_chan *schan) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - return dmae_is_busy(sh_chan); -} - -static void sh_dmae_setup_xfer(struct shdma_chan *schan, - int slave_id) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - - if (slave_id >= 0) { - const struct sh_dmae_slave_config *cfg = - sh_chan->config; - - dmae_set_dmars(sh_chan, cfg->mid_rid); - dmae_set_chcr(sh_chan, cfg->chcr); - } else { - dmae_init(sh_chan); - } -} - -/* - * Find a slave channel configuration from the contoller list by either a slave - * ID in the non-DT case, or by a MID/RID value in the DT case - */ -static const struct sh_dmae_slave_config *dmae_find_slave( - struct sh_dmae_chan *sh_chan, int match) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_chan); - const struct sh_dmae_pdata *pdata = shdev->pdata; - const struct sh_dmae_slave_config *cfg; - int i; - - if (!sh_chan->shdma_chan.dev->of_node) { - if (match >= SH_DMA_SLAVE_NUMBER) - return NULL; - - for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) - if (cfg->slave_id == match) - return cfg; - } else { - for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) - if (cfg->mid_rid == match) { - sh_chan->shdma_chan.slave_id = cfg->slave_id; - return cfg; - } - } - - return NULL; -} - -static int sh_dmae_set_slave(struct shdma_chan *schan, - int slave_id, bool try) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id); - if (!cfg) - return -ENXIO; - - if (!try) - sh_chan->config = cfg; - - return 0; -} - -static void dmae_halt(struct sh_dmae_chan *sh_chan) -{ - struct sh_dmae_device *shdev = to_sh_dev(sh_chan); - u32 chcr = chcr_read(sh_chan); - - chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); - chcr_write(sh_chan, chcr); -} - -static int sh_dmae_desc_setup(struct shdma_chan *schan, - struct shdma_desc *sdesc, - dma_addr_t src, dma_addr_t dst, size_t *len) -{ - struct sh_dmae_desc *sh_desc = container_of(sdesc, - struct sh_dmae_desc, shdma_desc); - - if (*len > schan->max_xfer_len) - *len = schan->max_xfer_len; - - sh_desc->hw.sar = src; - sh_desc->hw.dar = dst; - sh_desc->hw.tcr = *len; - - return 0; -} - -static void sh_dmae_halt(struct shdma_chan *schan) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - dmae_halt(sh_chan); -} - -static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - - if (!(chcr_read(sh_chan) & CHCR_TE)) - return false; - - /* DMA stop */ - dmae_halt(sh_chan); - - return true; -} - -static size_t sh_dmae_get_partial(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, - shdma_chan); - struct sh_dmae_desc *sh_desc = container_of(sdesc, - struct sh_dmae_desc, shdma_desc); - return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << - sh_chan->xmit_shift; -} - -/* Called from error IRQ or NMI */ -static bool sh_dmae_reset(struct sh_dmae_device *shdev) -{ - bool ret; - - /* halt the dma controller */ - sh_dmae_ctl_stop(shdev); - - /* We cannot detect, which channel caused the error, have to reset all */ - ret = shdma_reset(&shdev->shdma_dev); - - sh_dmae_rst(shdev); - - return ret; -} - -static irqreturn_t sh_dmae_err(int irq, void *data) -{ - struct sh_dmae_device *shdev = data; - - if (!(dmaor_read(shdev) & DMAOR_AE)) - return IRQ_NONE; - - sh_dmae_reset(shdev); - return IRQ_HANDLED; -} - -static bool sh_dmae_desc_completed(struct shdma_chan *schan, - struct shdma_desc *sdesc) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, - struct sh_dmae_chan, shdma_chan); - struct sh_dmae_desc *sh_desc = container_of(sdesc, - struct sh_dmae_desc, shdma_desc); - u32 sar_buf = sh_dmae_readl(sh_chan, SAR); - u32 dar_buf = sh_dmae_readl(sh_chan, DAR); - - return (sdesc->direction == DMA_DEV_TO_MEM && - (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) || - (sdesc->direction != DMA_DEV_TO_MEM && - (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf); -} - -static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) -{ - /* Fast path out if NMIF is not asserted for this controller */ - if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) - return false; - - return sh_dmae_reset(shdev); -} - -static int sh_dmae_nmi_handler(struct notifier_block *self, - unsigned long cmd, void *data) -{ - struct sh_dmae_device *shdev; - int ret = NOTIFY_DONE; - bool triggered; - - /* - * Only concern ourselves with NMI events. - * - * Normally we would check the die chain value, but as this needs - * to be architecture independent, check for NMI context instead. - */ - if (!in_nmi()) - return NOTIFY_DONE; - - rcu_read_lock(); - list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { - /* - * Only stop if one of the controllers has NMIF asserted, - * we do not want to interfere with regular address error - * handling or NMI events that don't concern the DMACs. - */ - triggered = sh_dmae_nmi_notify(shdev); - if (triggered == true) - ret = NOTIFY_OK; - } - rcu_read_unlock(); - - return ret; -} - -static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { - .notifier_call = sh_dmae_nmi_handler, - - /* Run before NMI debug handler and KGDB */ - .priority = 1, -}; - -static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, - int irq, unsigned long flags) -{ - const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; - struct shdma_dev *sdev = &shdev->shdma_dev; - struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); - struct sh_dmae_chan *sh_chan; - struct shdma_chan *schan; - int err; - - sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan), - GFP_KERNEL); - if (!sh_chan) { - dev_err(sdev->dma_dev.dev, - "No free memory for allocating dma channels!\n"); - return -ENOMEM; - } - - schan = &sh_chan->shdma_chan; - schan->max_xfer_len = SH_DMA_TCR_MAX + 1; - - shdma_chan_probe(sdev, schan, id); - - sh_chan->base = shdev->chan_reg + chan_pdata->offset; - - /* set up channel irq */ - if (pdev->id >= 0) - snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), - "sh-dmae%d.%d", pdev->id, id); - else - snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), - "sh-dma%d", id); - - err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id); - if (err) { - dev_err(sdev->dma_dev.dev, - "DMA channel %d request_irq error %d\n", - id, err); - goto err_no_irq; - } - - shdev->chan[id] = sh_chan; - return 0; - -err_no_irq: - /* remove from dmaengine device node */ - shdma_chan_remove(schan); - return err; -} - -static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) -{ - struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; - struct shdma_chan *schan; - int i; - - shdma_for_each_chan(schan, &shdev->shdma_dev, i) { - BUG_ON(!schan); - - shdma_chan_remove(schan); - } - dma_dev->chancnt = 0; -} - -static void sh_dmae_shutdown(struct platform_device *pdev) -{ - struct sh_dmae_device *shdev = platform_get_drvdata(pdev); - sh_dmae_ctl_stop(shdev); -} - -static int sh_dmae_runtime_suspend(struct device *dev) -{ - return 0; -} - -static int sh_dmae_runtime_resume(struct device *dev) -{ - struct sh_dmae_device *shdev = dev_get_drvdata(dev); - - return sh_dmae_rst(shdev); -} - -#ifdef CONFIG_PM -static int sh_dmae_suspend(struct device *dev) -{ - return 0; -} - -static int sh_dmae_resume(struct device *dev) -{ - struct sh_dmae_device *shdev = dev_get_drvdata(dev); - int i, ret; - - ret = sh_dmae_rst(shdev); - if (ret < 0) - dev_err(dev, "Failed to reset!\n"); - - for (i = 0; i < shdev->pdata->channel_num; i++) { - struct sh_dmae_chan *sh_chan = shdev->chan[i]; - - if (!sh_chan->shdma_chan.desc_num) - continue; - - if (sh_chan->shdma_chan.slave_id >= 0) { - const struct sh_dmae_slave_config *cfg = sh_chan->config; - dmae_set_dmars(sh_chan, cfg->mid_rid); - dmae_set_chcr(sh_chan, cfg->chcr); - } else { - dmae_init(sh_chan); - } - } - - return 0; -} -#else -#define sh_dmae_suspend NULL -#define sh_dmae_resume NULL -#endif - -const struct dev_pm_ops sh_dmae_pm = { - .suspend = sh_dmae_suspend, - .resume = sh_dmae_resume, - .runtime_suspend = sh_dmae_runtime_suspend, - .runtime_resume = sh_dmae_runtime_resume, -}; - -static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan) -{ - struct sh_dmae_chan *sh_chan = container_of(schan, - struct sh_dmae_chan, shdma_chan); - - /* - * Implicit BUG_ON(!sh_chan->config) - * This is an exclusive slave DMA operation, may only be called after a - * successful slave configuration. - */ - return sh_chan->config->addr; -} - -static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i) -{ - return &((struct sh_dmae_desc *)buf)[i].shdma_desc; -} - -static const struct shdma_ops sh_dmae_shdma_ops = { - .desc_completed = sh_dmae_desc_completed, - .halt_channel = sh_dmae_halt, - .channel_busy = sh_dmae_channel_busy, - .slave_addr = sh_dmae_slave_addr, - .desc_setup = sh_dmae_desc_setup, - .set_slave = sh_dmae_set_slave, - .setup_xfer = sh_dmae_setup_xfer, - .start_xfer = sh_dmae_start_xfer, - .embedded_desc = sh_dmae_embedded_desc, - .chan_irq = sh_dmae_chan_irq, - .get_partial = sh_dmae_get_partial, -}; - -static int sh_dmae_probe(struct platform_device *pdev) -{ - const struct sh_dmae_pdata *pdata = pdev->dev.platform_data; - unsigned long irqflags = IRQF_DISABLED, - chan_flag[SH_DMAE_MAX_CHANNELS] = {}; - int errirq, chan_irq[SH_DMAE_MAX_CHANNELS]; - int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; - struct sh_dmae_device *shdev; - struct dma_device *dma_dev; - struct resource *chan, *dmars, *errirq_res, *chanirq_res; - - /* get platform data */ - if (!pdata || !pdata->channel_num) - return -ENODEV; - - chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); - /* DMARS area is optional */ - dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); - /* - * IRQ resources: - * 1. there always must be at least one IRQ IO-resource. On SH4 it is - * the error IRQ, in which case it is the only IRQ in this resource: - * start == end. If it is the only IRQ resource, all channels also - * use the same IRQ. - * 2. DMA channel IRQ resources can be specified one per resource or in - * ranges (start != end) - * 3. iff all events (channels and, optionally, error) on this - * controller use the same IRQ, only one IRQ resource can be - * specified, otherwise there must be one IRQ per channel, even if - * some of them are equal - * 4. if all IRQs on this controller are equal or if some specific IRQs - * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be - * requested with the IRQF_SHARED flag - */ - errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!chan || !errirq_res) - return -ENODEV; - - shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device), - GFP_KERNEL); - if (!shdev) { - dev_err(&pdev->dev, "Not enough memory\n"); - return -ENOMEM; - } - - dma_dev = &shdev->shdma_dev.dma_dev; - - shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); - if (IS_ERR(shdev->chan_reg)) - return PTR_ERR(shdev->chan_reg); - if (dmars) { - shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars); - if (IS_ERR(shdev->dmars)) - return PTR_ERR(shdev->dmars); - } - - if (!pdata->slave_only) - dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); - if (pdata->slave && pdata->slave_num) - dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); - - /* Default transfer size of 32 bytes requires 32-byte alignment */ - dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; - - shdev->shdma_dev.ops = &sh_dmae_shdma_ops; - shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc); - err = shdma_init(&pdev->dev, &shdev->shdma_dev, - pdata->channel_num); - if (err < 0) - goto eshdma; - - /* platform data */ - shdev->pdata = pdata; - - if (pdata->chcr_offset) - shdev->chcr_offset = pdata->chcr_offset; - else - shdev->chcr_offset = CHCR; - - if (pdata->chcr_ie_bit) - shdev->chcr_ie_bit = pdata->chcr_ie_bit; - else - shdev->chcr_ie_bit = CHCR_IE; - - platform_set_drvdata(pdev, shdev); - - pm_runtime_enable(&pdev->dev); - err = pm_runtime_get_sync(&pdev->dev); - if (err < 0) - dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); - - spin_lock_irq(&sh_dmae_lock); - list_add_tail_rcu(&shdev->node, &sh_dmae_devices); - spin_unlock_irq(&sh_dmae_lock); - - /* reset dma controller - only needed as a test */ - err = sh_dmae_rst(shdev); - if (err) - goto rst_err; - -#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) - chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); - - if (!chanirq_res) - chanirq_res = errirq_res; - else - irqres++; - - if (chanirq_res == errirq_res || - (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) - irqflags = IRQF_SHARED; - - errirq = errirq_res->start; - - err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags, - "DMAC Address Error", shdev); - if (err) { - dev_err(&pdev->dev, - "DMA failed requesting irq #%d, error %d\n", - errirq, err); - goto eirq_err; - } - -#else - chanirq_res = errirq_res; -#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ - - if (chanirq_res->start == chanirq_res->end && - !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { - /* Special case - all multiplexed */ - for (; irq_cnt < pdata->channel_num; irq_cnt++) { - if (irq_cnt < SH_DMAE_MAX_CHANNELS) { - chan_irq[irq_cnt] = chanirq_res->start; - chan_flag[irq_cnt] = IRQF_SHARED; - } else { - irq_cap = 1; - break; - } - } - } else { - do { - for (i = chanirq_res->start; i <= chanirq_res->end; i++) { - if (irq_cnt >= SH_DMAE_MAX_CHANNELS) { - irq_cap = 1; - break; - } - - if ((errirq_res->flags & IORESOURCE_BITS) == - IORESOURCE_IRQ_SHAREABLE) - chan_flag[irq_cnt] = IRQF_SHARED; - else - chan_flag[irq_cnt] = IRQF_DISABLED; - dev_dbg(&pdev->dev, - "Found IRQ %d for channel %d\n", - i, irq_cnt); - chan_irq[irq_cnt++] = i; - } - - if (irq_cnt >= SH_DMAE_MAX_CHANNELS) - break; - - chanirq_res = platform_get_resource(pdev, - IORESOURCE_IRQ, ++irqres); - } while (irq_cnt < pdata->channel_num && chanirq_res); - } - - /* Create DMA Channel */ - for (i = 0; i < irq_cnt; i++) { - err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); - if (err) - goto chan_probe_err; - } - - if (irq_cap) - dev_notice(&pdev->dev, "Attempting to register %d DMA " - "channels when a maximum of %d are supported.\n", - pdata->channel_num, SH_DMAE_MAX_CHANNELS); - - pm_runtime_put(&pdev->dev); - - err = dma_async_device_register(&shdev->shdma_dev.dma_dev); - if (err < 0) - goto edmadevreg; - - return err; - -edmadevreg: - pm_runtime_get(&pdev->dev); - -chan_probe_err: - sh_dmae_chan_remove(shdev); - -#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) -eirq_err: -#endif -rst_err: - spin_lock_irq(&sh_dmae_lock); - list_del_rcu(&shdev->node); - spin_unlock_irq(&sh_dmae_lock); - - pm_runtime_put(&pdev->dev); - pm_runtime_disable(&pdev->dev); - - platform_set_drvdata(pdev, NULL); - shdma_cleanup(&shdev->shdma_dev); -eshdma: - synchronize_rcu(); - - return err; -} - -static int sh_dmae_remove(struct platform_device *pdev) -{ - struct sh_dmae_device *shdev = platform_get_drvdata(pdev); - struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; - struct resource *res; - int errirq = platform_get_irq(pdev, 0); - - dma_async_device_unregister(dma_dev); - - if (errirq > 0) - free_irq(errirq, shdev); - - spin_lock_irq(&sh_dmae_lock); - list_del_rcu(&shdev->node); - spin_unlock_irq(&sh_dmae_lock); - - pm_runtime_disable(&pdev->dev); - - sh_dmae_chan_remove(shdev); - shdma_cleanup(&shdev->shdma_dev); - - platform_set_drvdata(pdev, NULL); - - synchronize_rcu(); - - return 0; -} - -static const struct of_device_id sh_dmae_of_match[] = { - { .compatible = "renesas,shdma", }, - { } -}; -MODULE_DEVICE_TABLE(of, sh_dmae_of_match); - -static struct platform_driver sh_dmae_driver = { - .driver = { - .owner = THIS_MODULE, - .pm = &sh_dmae_pm, - .name = SH_DMAE_DRV_NAME, - .of_match_table = sh_dmae_of_match, - }, - .remove = sh_dmae_remove, - .shutdown = sh_dmae_shutdown, -}; - -static int __init sh_dmae_init(void) -{ - /* Wire up NMI handling */ - int err = register_die_notifier(&sh_dmae_nmi_notifier); - if (err) - return err; - - return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); -} -module_init(sh_dmae_init); - -static void __exit sh_dmae_exit(void) -{ - platform_driver_unregister(&sh_dmae_driver); - - unregister_die_notifier(&sh_dmae_nmi_notifier); -} -module_exit(sh_dmae_exit); - -MODULE_AUTHOR("Nobuhiro Iwamatsu "); -MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME); diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h index 3d9dca177860..ff2f93b612ca 100644 --- a/drivers/dma/sh/shdma.h +++ b/drivers/dma/sh/shdma.h @@ -31,6 +31,7 @@ struct sh_dmae_chan { void __iomem *base; char dev_id[16]; /* unique name per DMAC of channel */ int pm_error; + dma_addr_t slave_addr; }; struct sh_dmae_device { diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c new file mode 100644 index 000000000000..a47b70879e05 --- /dev/null +++ b/drivers/dma/sh/shdmac.c @@ -0,0 +1,952 @@ +/* + * Renesas SuperH DMA Engine support + * + * base is drivers/dma/flsdma.c + * + * Copyright (C) 2011-2012 Guennadi Liakhovetski + * Copyright (C) 2009 Nobuhiro Iwamatsu + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * - DMA of SuperH does not have Hardware DMA chain mode. + * - MAX DMA size is 16MB. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../dmaengine.h" +#include "shdma.h" + +#define SH_DMAE_DRV_NAME "sh-dma-engine" + +/* Default MEMCPY transfer size = 2^2 = 4 bytes */ +#define LOG2_DEFAULT_XFER_SIZE 2 +#define SH_DMA_SLAVE_NUMBER 256 +#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1) + +/* + * Used for write-side mutual exclusion for the global device list, + * read-side synchronization by way of RCU, and per-controller data. + */ +static DEFINE_SPINLOCK(sh_dmae_lock); +static LIST_HEAD(sh_dmae_devices); + +/* + * Different DMAC implementations provide different ways to clear DMA channels: + * (1) none - no CHCLR registers are available + * (2) one CHCLR register per channel - 0 has to be written to it to clear + * channel buffers + * (3) one CHCLR per several channels - 1 has to be written to the bit, + * corresponding to the specific channel to reset it + */ +static void channel_clear(struct sh_dmae_chan *sh_dc) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel + + sh_dc->shdma_chan.id; + u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0; + + __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset); +} + +static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) +{ + __raw_writel(data, sh_dc->base + reg); +} + +static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) +{ + return __raw_readl(sh_dc->base + reg); +} + +static u16 dmaor_read(struct sh_dmae_device *shdev) +{ + void __iomem *addr = shdev->chan_reg + DMAOR; + + if (shdev->pdata->dmaor_is_32bit) + return __raw_readl(addr); + else + return __raw_readw(addr); +} + +static void dmaor_write(struct sh_dmae_device *shdev, u16 data) +{ + void __iomem *addr = shdev->chan_reg + DMAOR; + + if (shdev->pdata->dmaor_is_32bit) + __raw_writel(data, addr); + else + __raw_writew(data, addr); +} + +static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + __raw_writel(data, sh_dc->base + shdev->chcr_offset); +} + +static u32 chcr_read(struct sh_dmae_chan *sh_dc) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + return __raw_readl(sh_dc->base + shdev->chcr_offset); +} + +/* + * Reset DMA controller + * + * SH7780 has two DMAOR register + */ +static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) +{ + unsigned short dmaor; + unsigned long flags; + + spin_lock_irqsave(&sh_dmae_lock, flags); + + dmaor = dmaor_read(shdev); + dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); + + spin_unlock_irqrestore(&sh_dmae_lock, flags); +} + +static int sh_dmae_rst(struct sh_dmae_device *shdev) +{ + unsigned short dmaor; + unsigned long flags; + + spin_lock_irqsave(&sh_dmae_lock, flags); + + dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); + + if (shdev->pdata->chclr_present) { + int i; + for (i = 0; i < shdev->pdata->channel_num; i++) { + struct sh_dmae_chan *sh_chan = shdev->chan[i]; + if (sh_chan) + channel_clear(sh_chan); + } + } + + dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); + + dmaor = dmaor_read(shdev); + + spin_unlock_irqrestore(&sh_dmae_lock, flags); + + if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { + dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n"); + return -EIO; + } + if (shdev->pdata->dmaor_init & ~dmaor) + dev_warn(shdev->shdma_dev.dma_dev.dev, + "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", + dmaor, shdev->pdata->dmaor_init); + return 0; +} + +static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = chcr_read(sh_chan); + + if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) + return true; /* working */ + + return false; /* waiting */ +} + +static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | + ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); + + if (cnt >= pdata->ts_shift_num) + cnt = 0; + + return pdata->ts_shift[cnt]; +} + +static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + int i; + + for (i = 0; i < pdata->ts_shift_num; i++) + if (pdata->ts_shift[i] == l2size) + break; + + if (i == pdata->ts_shift_num) + i = 0; + + return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | + ((i << pdata->ts_high_shift) & pdata->ts_high_mask); +} + +static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) +{ + sh_dmae_writel(sh_chan, hw->sar, SAR); + sh_dmae_writel(sh_chan, hw->dar, DAR); + sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); +} + +static void dmae_start(struct sh_dmae_chan *sh_chan) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + u32 chcr = chcr_read(sh_chan); + + if (shdev->pdata->needs_tend_set) + sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); + + chcr |= CHCR_DE | shdev->chcr_ie_bit; + chcr_write(sh_chan, chcr & ~CHCR_TE); +} + +static void dmae_init(struct sh_dmae_chan *sh_chan) +{ + /* + * Default configuration for dual address memory-memory transfer. + * 0x400 represents auto-request. + */ + u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, + LOG2_DEFAULT_XFER_SIZE); + sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); + chcr_write(sh_chan, chcr); +} + +static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) +{ + /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ + if (dmae_is_busy(sh_chan)) + return -EBUSY; + + sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); + chcr_write(sh_chan, val); + + return 0; +} + +static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id]; + void __iomem *addr = shdev->dmars; + unsigned int shift = chan_pdata->dmars_bit; + + if (dmae_is_busy(sh_chan)) + return -EBUSY; + + if (pdata->no_dmars) + return 0; + + /* in the case of a missing DMARS resource use first memory window */ + if (!addr) + addr = shdev->chan_reg; + addr += chan_pdata->dmars; + + __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), + addr); + + return 0; +} + +static void sh_dmae_start_xfer(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n", + sdesc->async_tx.cookie, sh_chan->shdma_chan.id, + sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar); + /* Get the ld start address from ld_queue */ + dmae_set_reg(sh_chan, &sh_desc->hw); + dmae_start(sh_chan); +} + +static bool sh_dmae_channel_busy(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + return dmae_is_busy(sh_chan); +} + +static void sh_dmae_setup_xfer(struct shdma_chan *schan, + int slave_id) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + + if (slave_id >= 0) { + const struct sh_dmae_slave_config *cfg = + sh_chan->config; + + dmae_set_dmars(sh_chan, cfg->mid_rid); + dmae_set_chcr(sh_chan, cfg->chcr); + } else { + dmae_init(sh_chan); + } +} + +/* + * Find a slave channel configuration from the contoller list by either a slave + * ID in the non-DT case, or by a MID/RID value in the DT case + */ +static const struct sh_dmae_slave_config *dmae_find_slave( + struct sh_dmae_chan *sh_chan, int match) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + const struct sh_dmae_slave_config *cfg; + int i; + + if (!sh_chan->shdma_chan.dev->of_node) { + if (match >= SH_DMA_SLAVE_NUMBER) + return NULL; + + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) + if (cfg->slave_id == match) + return cfg; + } else { + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) + if (cfg->mid_rid == match) { + sh_chan->shdma_chan.slave_id = i; + return cfg; + } + } + + return NULL; +} + +static int sh_dmae_set_slave(struct shdma_chan *schan, + int slave_id, dma_addr_t slave_addr, bool try) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id); + if (!cfg) + return -ENXIO; + + if (!try) { + sh_chan->config = cfg; + sh_chan->slave_addr = slave_addr ? : cfg->addr; + } + + return 0; +} + +static void dmae_halt(struct sh_dmae_chan *sh_chan) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + u32 chcr = chcr_read(sh_chan); + + chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); + chcr_write(sh_chan, chcr); +} + +static int sh_dmae_desc_setup(struct shdma_chan *schan, + struct shdma_desc *sdesc, + dma_addr_t src, dma_addr_t dst, size_t *len) +{ + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + + if (*len > schan->max_xfer_len) + *len = schan->max_xfer_len; + + sh_desc->hw.sar = src; + sh_desc->hw.dar = dst; + sh_desc->hw.tcr = *len; + + return 0; +} + +static void sh_dmae_halt(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + dmae_halt(sh_chan); +} + +static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + + if (!(chcr_read(sh_chan) & CHCR_TE)) + return false; + + /* DMA stop */ + dmae_halt(sh_chan); + + return true; +} + +static size_t sh_dmae_get_partial(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << + sh_chan->xmit_shift; +} + +/* Called from error IRQ or NMI */ +static bool sh_dmae_reset(struct sh_dmae_device *shdev) +{ + bool ret; + + /* halt the dma controller */ + sh_dmae_ctl_stop(shdev); + + /* We cannot detect, which channel caused the error, have to reset all */ + ret = shdma_reset(&shdev->shdma_dev); + + sh_dmae_rst(shdev); + + return ret; +} + +static irqreturn_t sh_dmae_err(int irq, void *data) +{ + struct sh_dmae_device *shdev = data; + + if (!(dmaor_read(shdev) & DMAOR_AE)) + return IRQ_NONE; + + sh_dmae_reset(shdev); + return IRQ_HANDLED; +} + +static bool sh_dmae_desc_completed(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + u32 sar_buf = sh_dmae_readl(sh_chan, SAR); + u32 dar_buf = sh_dmae_readl(sh_chan, DAR); + + return (sdesc->direction == DMA_DEV_TO_MEM && + (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) || + (sdesc->direction != DMA_DEV_TO_MEM && + (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf); +} + +static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) +{ + /* Fast path out if NMIF is not asserted for this controller */ + if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) + return false; + + return sh_dmae_reset(shdev); +} + +static int sh_dmae_nmi_handler(struct notifier_block *self, + unsigned long cmd, void *data) +{ + struct sh_dmae_device *shdev; + int ret = NOTIFY_DONE; + bool triggered; + + /* + * Only concern ourselves with NMI events. + * + * Normally we would check the die chain value, but as this needs + * to be architecture independent, check for NMI context instead. + */ + if (!in_nmi()) + return NOTIFY_DONE; + + rcu_read_lock(); + list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { + /* + * Only stop if one of the controllers has NMIF asserted, + * we do not want to interfere with regular address error + * handling or NMI events that don't concern the DMACs. + */ + triggered = sh_dmae_nmi_notify(shdev); + if (triggered == true) + ret = NOTIFY_OK; + } + rcu_read_unlock(); + + return ret; +} + +static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { + .notifier_call = sh_dmae_nmi_handler, + + /* Run before NMI debug handler and KGDB */ + .priority = 1, +}; + +static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, + int irq, unsigned long flags) +{ + const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; + struct shdma_dev *sdev = &shdev->shdma_dev; + struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); + struct sh_dmae_chan *sh_chan; + struct shdma_chan *schan; + int err; + + sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan), + GFP_KERNEL); + if (!sh_chan) { + dev_err(sdev->dma_dev.dev, + "No free memory for allocating dma channels!\n"); + return -ENOMEM; + } + + schan = &sh_chan->shdma_chan; + schan->max_xfer_len = SH_DMA_TCR_MAX + 1; + + shdma_chan_probe(sdev, schan, id); + + sh_chan->base = shdev->chan_reg + chan_pdata->offset; + + /* set up channel irq */ + if (pdev->id >= 0) + snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), + "sh-dmae%d.%d", pdev->id, id); + else + snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), + "sh-dma%d", id); + + err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id); + if (err) { + dev_err(sdev->dma_dev.dev, + "DMA channel %d request_irq error %d\n", + id, err); + goto err_no_irq; + } + + shdev->chan[id] = sh_chan; + return 0; + +err_no_irq: + /* remove from dmaengine device node */ + shdma_chan_remove(schan); + return err; +} + +static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) +{ + struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; + struct shdma_chan *schan; + int i; + + shdma_for_each_chan(schan, &shdev->shdma_dev, i) { + BUG_ON(!schan); + + shdma_chan_remove(schan); + } + dma_dev->chancnt = 0; +} + +static void sh_dmae_shutdown(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + sh_dmae_ctl_stop(shdev); +} + +static int sh_dmae_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int sh_dmae_runtime_resume(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + + return sh_dmae_rst(shdev); +} + +#ifdef CONFIG_PM +static int sh_dmae_suspend(struct device *dev) +{ + return 0; +} + +static int sh_dmae_resume(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + int i, ret; + + ret = sh_dmae_rst(shdev); + if (ret < 0) + dev_err(dev, "Failed to reset!\n"); + + for (i = 0; i < shdev->pdata->channel_num; i++) { + struct sh_dmae_chan *sh_chan = shdev->chan[i]; + + if (!sh_chan->shdma_chan.desc_num) + continue; + + if (sh_chan->shdma_chan.slave_id >= 0) { + const struct sh_dmae_slave_config *cfg = sh_chan->config; + dmae_set_dmars(sh_chan, cfg->mid_rid); + dmae_set_chcr(sh_chan, cfg->chcr); + } else { + dmae_init(sh_chan); + } + } + + return 0; +} +#else +#define sh_dmae_suspend NULL +#define sh_dmae_resume NULL +#endif + +const struct dev_pm_ops sh_dmae_pm = { + .suspend = sh_dmae_suspend, + .resume = sh_dmae_resume, + .runtime_suspend = sh_dmae_runtime_suspend, + .runtime_resume = sh_dmae_runtime_resume, +}; + +static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + + /* + * Implicit BUG_ON(!sh_chan->config) + * This is an exclusive slave DMA operation, may only be called after a + * successful slave configuration. + */ + return sh_chan->slave_addr; +} + +static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i) +{ + return &((struct sh_dmae_desc *)buf)[i].shdma_desc; +} + +static const struct shdma_ops sh_dmae_shdma_ops = { + .desc_completed = sh_dmae_desc_completed, + .halt_channel = sh_dmae_halt, + .channel_busy = sh_dmae_channel_busy, + .slave_addr = sh_dmae_slave_addr, + .desc_setup = sh_dmae_desc_setup, + .set_slave = sh_dmae_set_slave, + .setup_xfer = sh_dmae_setup_xfer, + .start_xfer = sh_dmae_start_xfer, + .embedded_desc = sh_dmae_embedded_desc, + .chan_irq = sh_dmae_chan_irq, + .get_partial = sh_dmae_get_partial, +}; + +static const struct of_device_id sh_dmae_of_match[] = { + {} +}; +MODULE_DEVICE_TABLE(of, sh_dmae_of_match); + +static int sh_dmae_probe(struct platform_device *pdev) +{ + const struct sh_dmae_pdata *pdata; + unsigned long irqflags = IRQF_DISABLED, + chan_flag[SH_DMAE_MAX_CHANNELS] = {}; + int errirq, chan_irq[SH_DMAE_MAX_CHANNELS]; + int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; + struct sh_dmae_device *shdev; + struct dma_device *dma_dev; + struct resource *chan, *dmars, *errirq_res, *chanirq_res; + + if (pdev->dev.of_node) + pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data; + else + pdata = pdev->dev.platform_data; + + /* get platform data */ + if (!pdata || !pdata->channel_num) + return -ENODEV; + + chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); + /* DMARS area is optional */ + dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); + /* + * IRQ resources: + * 1. there always must be at least one IRQ IO-resource. On SH4 it is + * the error IRQ, in which case it is the only IRQ in this resource: + * start == end. If it is the only IRQ resource, all channels also + * use the same IRQ. + * 2. DMA channel IRQ resources can be specified one per resource or in + * ranges (start != end) + * 3. iff all events (channels and, optionally, error) on this + * controller use the same IRQ, only one IRQ resource can be + * specified, otherwise there must be one IRQ per channel, even if + * some of them are equal + * 4. if all IRQs on this controller are equal or if some specific IRQs + * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be + * requested with the IRQF_SHARED flag + */ + errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!chan || !errirq_res) + return -ENODEV; + + shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device), + GFP_KERNEL); + if (!shdev) { + dev_err(&pdev->dev, "Not enough memory\n"); + return -ENOMEM; + } + + dma_dev = &shdev->shdma_dev.dma_dev; + + shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); + if (IS_ERR(shdev->chan_reg)) + return PTR_ERR(shdev->chan_reg); + if (dmars) { + shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars); + if (IS_ERR(shdev->dmars)) + return PTR_ERR(shdev->dmars); + } + + if (!pdata->slave_only) + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + if (pdata->slave && pdata->slave_num) + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + + /* Default transfer size of 32 bytes requires 32-byte alignment */ + dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; + + shdev->shdma_dev.ops = &sh_dmae_shdma_ops; + shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc); + err = shdma_init(&pdev->dev, &shdev->shdma_dev, + pdata->channel_num); + if (err < 0) + goto eshdma; + + /* platform data */ + shdev->pdata = pdata; + + if (pdata->chcr_offset) + shdev->chcr_offset = pdata->chcr_offset; + else + shdev->chcr_offset = CHCR; + + if (pdata->chcr_ie_bit) + shdev->chcr_ie_bit = pdata->chcr_ie_bit; + else + shdev->chcr_ie_bit = CHCR_IE; + + platform_set_drvdata(pdev, shdev); + + pm_runtime_enable(&pdev->dev); + err = pm_runtime_get_sync(&pdev->dev); + if (err < 0) + dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); + + spin_lock_irq(&sh_dmae_lock); + list_add_tail_rcu(&shdev->node, &sh_dmae_devices); + spin_unlock_irq(&sh_dmae_lock); + + /* reset dma controller - only needed as a test */ + err = sh_dmae_rst(shdev); + if (err) + goto rst_err; + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) + chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); + + if (!chanirq_res) + chanirq_res = errirq_res; + else + irqres++; + + if (chanirq_res == errirq_res || + (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) + irqflags = IRQF_SHARED; + + errirq = errirq_res->start; + + err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags, + "DMAC Address Error", shdev); + if (err) { + dev_err(&pdev->dev, + "DMA failed requesting irq #%d, error %d\n", + errirq, err); + goto eirq_err; + } + +#else + chanirq_res = errirq_res; +#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ + + if (chanirq_res->start == chanirq_res->end && + !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { + /* Special case - all multiplexed */ + for (; irq_cnt < pdata->channel_num; irq_cnt++) { + if (irq_cnt < SH_DMAE_MAX_CHANNELS) { + chan_irq[irq_cnt] = chanirq_res->start; + chan_flag[irq_cnt] = IRQF_SHARED; + } else { + irq_cap = 1; + break; + } + } + } else { + do { + for (i = chanirq_res->start; i <= chanirq_res->end; i++) { + if (irq_cnt >= SH_DMAE_MAX_CHANNELS) { + irq_cap = 1; + break; + } + + if ((errirq_res->flags & IORESOURCE_BITS) == + IORESOURCE_IRQ_SHAREABLE) + chan_flag[irq_cnt] = IRQF_SHARED; + else + chan_flag[irq_cnt] = IRQF_DISABLED; + dev_dbg(&pdev->dev, + "Found IRQ %d for channel %d\n", + i, irq_cnt); + chan_irq[irq_cnt++] = i; + } + + if (irq_cnt >= SH_DMAE_MAX_CHANNELS) + break; + + chanirq_res = platform_get_resource(pdev, + IORESOURCE_IRQ, ++irqres); + } while (irq_cnt < pdata->channel_num && chanirq_res); + } + + /* Create DMA Channel */ + for (i = 0; i < irq_cnt; i++) { + err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); + if (err) + goto chan_probe_err; + } + + if (irq_cap) + dev_notice(&pdev->dev, "Attempting to register %d DMA " + "channels when a maximum of %d are supported.\n", + pdata->channel_num, SH_DMAE_MAX_CHANNELS); + + pm_runtime_put(&pdev->dev); + + err = dma_async_device_register(&shdev->shdma_dev.dma_dev); + if (err < 0) + goto edmadevreg; + + return err; + +edmadevreg: + pm_runtime_get(&pdev->dev); + +chan_probe_err: + sh_dmae_chan_remove(shdev); + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) +eirq_err: +#endif +rst_err: + spin_lock_irq(&sh_dmae_lock); + list_del_rcu(&shdev->node); + spin_unlock_irq(&sh_dmae_lock); + + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + platform_set_drvdata(pdev, NULL); + shdma_cleanup(&shdev->shdma_dev); +eshdma: + synchronize_rcu(); + + return err; +} + +static int sh_dmae_remove(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; + struct resource *res; + int errirq = platform_get_irq(pdev, 0); + + dma_async_device_unregister(dma_dev); + + if (errirq > 0) + free_irq(errirq, shdev); + + spin_lock_irq(&sh_dmae_lock); + list_del_rcu(&shdev->node); + spin_unlock_irq(&sh_dmae_lock); + + pm_runtime_disable(&pdev->dev); + + sh_dmae_chan_remove(shdev); + shdma_cleanup(&shdev->shdma_dev); + + platform_set_drvdata(pdev, NULL); + + synchronize_rcu(); + + return 0; +} + +static struct platform_driver sh_dmae_driver = { + .driver = { + .owner = THIS_MODULE, + .pm = &sh_dmae_pm, + .name = SH_DMAE_DRV_NAME, + .of_match_table = sh_dmae_of_match, + }, + .remove = sh_dmae_remove, + .shutdown = sh_dmae_shutdown, +}; + +static int __init sh_dmae_init(void) +{ + /* Wire up NMI handling */ + int err = register_die_notifier(&sh_dmae_nmi_notifier); + if (err) + return err; + + return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); +} +module_init(sh_dmae_init); + +static void __exit sh_dmae_exit(void) +{ + platform_driver_unregister(&sh_dmae_driver); + + unregister_die_notifier(&sh_dmae_nmi_notifier); +} +module_exit(sh_dmae_exit); + +MODULE_AUTHOR("Nobuhiro Iwamatsu "); +MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME); diff --git a/drivers/dma/sh/sudmac.c b/drivers/dma/sh/sudmac.c index 4808b45141b4..4600b429603e 100644 --- a/drivers/dma/sh/sudmac.c +++ b/drivers/dma/sh/sudmac.c @@ -150,7 +150,8 @@ static const struct sudmac_slave_config *sudmac_find_slave( return NULL; } -static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, bool try) +static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, + dma_addr_t slave_addr, bool try) { struct sudmac_chan *sc = to_chan(schan); const struct sudmac_slave_config *cfg = sudmac_find_slave(sc, slave_id); diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h index 31cf89fb1d5b..f92c0a43c54c 100644 --- a/include/linux/shdma-base.h +++ b/include/linux/shdma-base.h @@ -96,7 +96,7 @@ struct shdma_ops { dma_addr_t (*slave_addr)(struct shdma_chan *); int (*desc_setup)(struct shdma_chan *, struct shdma_desc *, dma_addr_t, dma_addr_t, size_t *); - int (*set_slave)(struct shdma_chan *, int, bool); + int (*set_slave)(struct shdma_chan *, int, dma_addr_t, bool); void (*setup_xfer)(struct shdma_chan *, int); void (*start_xfer)(struct shdma_chan *, struct shdma_desc *); struct shdma_desc *(*embedded_desc)(void *, int); -- cgit v1.2.3 From 8e6152bc660e69f526c6bf163ff0ebfdab90f6cf Mon Sep 17 00:00:00 2001 From: Zhangfei Gao Date: Tue, 27 Aug 2013 10:20:10 +0800 Subject: dmaengine: Add hisilicon k3 DMA engine driver Add dmaengine driver for hisilicon k3 platform based on virt_dma Signed-off-by: Zhangfei Gao Tested-by: Kai Yang Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul --- Documentation/devicetree/bindings/dma/k3dma.txt | 46 ++ drivers/dma/Kconfig | 9 + drivers/dma/Makefile | 1 + drivers/dma/k3dma.c | 837 ++++++++++++++++++++++++ 4 files changed, 893 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/k3dma.txt create mode 100644 drivers/dma/k3dma.c (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/dma/k3dma.txt b/Documentation/devicetree/bindings/dma/k3dma.txt new file mode 100644 index 000000000000..23f8d712c3ce --- /dev/null +++ b/Documentation/devicetree/bindings/dma/k3dma.txt @@ -0,0 +1,46 @@ +* Hisilicon K3 DMA controller + +See dma.txt first + +Required properties: +- compatible: Should be "hisilicon,k3-dma-1.0" +- reg: Should contain DMA registers location and length. +- interrupts: Should contain one interrupt shared by all channel +- #dma-cells: see dma.txt, should be 1, para number +- dma-channels: physical channels supported +- dma-requests: virtual channels supported, each virtual channel + have specific request line +- clocks: clock required + +Example: + +Controller: + dma0: dma@fcd02000 { + compatible = "hisilicon,k3-dma-1.0"; + reg = <0xfcd02000 0x1000>; + #dma-cells = <1>; + dma-channels = <16>; + dma-requests = <27>; + interrupts = <0 12 4>; + clocks = <&pclk>; + status = "disable"; + }; + +Client: +Use specific request line passing from dmax +For example, i2c0 read channel request line is 18, while write channel use 19 + + i2c0: i2c@fcb08000 { + compatible = "snps,designware-i2c"; + dmas = <&dma0 18 /* read channel */ + &dma0 19>; /* write channel */ + dma-names = "rx", "tx"; + }; + + i2c1: i2c@fcb09000 { + compatible = "snps,designware-i2c"; + dmas = <&dma0 20 /* read channel */ + &dma0 21>; /* write channel */ + dma-names = "rx", "tx"; + }; + diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 6825957c97fb..2945ff084a04 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -300,6 +300,15 @@ config DMA_JZ4740 select DMA_ENGINE select DMA_VIRTUAL_CHANNELS +config K3_DMA + tristate "Hisilicon K3 DMA support" + depends on ARCH_HI3xxx + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support the DMA engine for Hisilicon K3 platform + devices. + config DMA_ENGINE bool diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 5e0f2ef85614..8c97941df273 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o obj-$(CONFIG_DMA_OMAP) += omap-dma.o obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o +obj-$(CONFIG_K3_DMA) += k3dma.o diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c new file mode 100644 index 000000000000..ef7bc85d0b6d --- /dev/null +++ b/drivers/dma/k3dma.c @@ -0,0 +1,837 @@ +/* + * Copyright (c) 2013 Linaro Ltd. + * Copyright (c) 2013 Hisilicon Limited. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "virt-dma.h" + +#define DRIVER_NAME "k3-dma" +#define DMA_ALIGN 3 +#define DMA_MAX_SIZE 0x1ffc + +#define INT_STAT 0x00 +#define INT_TC1 0x04 +#define INT_ERR1 0x0c +#define INT_ERR2 0x10 +#define INT_TC1_MASK 0x18 +#define INT_ERR1_MASK 0x20 +#define INT_ERR2_MASK 0x24 +#define INT_TC1_RAW 0x600 +#define INT_ERR1_RAW 0x608 +#define INT_ERR2_RAW 0x610 +#define CH_PRI 0x688 +#define CH_STAT 0x690 +#define CX_CUR_CNT 0x704 +#define CX_LLI 0x800 +#define CX_CNT 0x810 +#define CX_SRC 0x814 +#define CX_DST 0x818 +#define CX_CFG 0x81c +#define AXI_CFG 0x820 +#define AXI_CFG_DEFAULT 0x201201 + +#define CX_LLI_CHAIN_EN 0x2 +#define CX_CFG_EN 0x1 +#define CX_CFG_MEM2PER (0x1 << 2) +#define CX_CFG_PER2MEM (0x2 << 2) +#define CX_CFG_SRCINCR (0x1 << 31) +#define CX_CFG_DSTINCR (0x1 << 30) + +struct k3_desc_hw { + u32 lli; + u32 reserved[3]; + u32 count; + u32 saddr; + u32 daddr; + u32 config; +} __aligned(32); + +struct k3_dma_desc_sw { + struct virt_dma_desc vd; + dma_addr_t desc_hw_lli; + size_t desc_num; + size_t size; + struct k3_desc_hw desc_hw[0]; +}; + +struct k3_dma_phy; + +struct k3_dma_chan { + u32 ccfg; + struct virt_dma_chan vc; + struct k3_dma_phy *phy; + struct list_head node; + enum dma_transfer_direction dir; + dma_addr_t dev_addr; + enum dma_status status; +}; + +struct k3_dma_phy { + u32 idx; + void __iomem *base; + struct k3_dma_chan *vchan; + struct k3_dma_desc_sw *ds_run; + struct k3_dma_desc_sw *ds_done; +}; + +struct k3_dma_dev { + struct dma_device slave; + void __iomem *base; + struct tasklet_struct task; + spinlock_t lock; + struct list_head chan_pending; + struct k3_dma_phy *phy; + struct k3_dma_chan *chans; + struct clk *clk; + u32 dma_channels; + u32 dma_requests; +}; + +#define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave) + +static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan) +{ + return container_of(chan, struct k3_dma_chan, vc.chan); +} + +static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on) +{ + u32 val = 0; + + if (on) { + val = readl_relaxed(phy->base + CX_CFG); + val |= CX_CFG_EN; + writel_relaxed(val, phy->base + CX_CFG); + } else { + val = readl_relaxed(phy->base + CX_CFG); + val &= ~CX_CFG_EN; + writel_relaxed(val, phy->base + CX_CFG); + } +} + +static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d) +{ + u32 val = 0; + + k3_dma_pause_dma(phy, false); + + val = 0x1 << phy->idx; + writel_relaxed(val, d->base + INT_TC1_RAW); + writel_relaxed(val, d->base + INT_ERR1_RAW); + writel_relaxed(val, d->base + INT_ERR2_RAW); +} + +static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw) +{ + writel_relaxed(hw->lli, phy->base + CX_LLI); + writel_relaxed(hw->count, phy->base + CX_CNT); + writel_relaxed(hw->saddr, phy->base + CX_SRC); + writel_relaxed(hw->daddr, phy->base + CX_DST); + writel_relaxed(AXI_CFG_DEFAULT, phy->base + AXI_CFG); + writel_relaxed(hw->config, phy->base + CX_CFG); +} + +static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy) +{ + u32 cnt = 0; + + cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10); + cnt &= 0xffff; + return cnt; +} + +static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy) +{ + return readl_relaxed(phy->base + CX_LLI); +} + +static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d) +{ + return readl_relaxed(d->base + CH_STAT); +} + +static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on) +{ + if (on) { + /* set same priority */ + writel_relaxed(0x0, d->base + CH_PRI); + + /* unmask irq */ + writel_relaxed(0xffff, d->base + INT_TC1_MASK); + writel_relaxed(0xffff, d->base + INT_ERR1_MASK); + writel_relaxed(0xffff, d->base + INT_ERR2_MASK); + } else { + /* mask irq */ + writel_relaxed(0x0, d->base + INT_TC1_MASK); + writel_relaxed(0x0, d->base + INT_ERR1_MASK); + writel_relaxed(0x0, d->base + INT_ERR2_MASK); + } +} + +static irqreturn_t k3_dma_int_handler(int irq, void *dev_id) +{ + struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id; + struct k3_dma_phy *p; + struct k3_dma_chan *c; + u32 stat = readl_relaxed(d->base + INT_STAT); + u32 tc1 = readl_relaxed(d->base + INT_TC1); + u32 err1 = readl_relaxed(d->base + INT_ERR1); + u32 err2 = readl_relaxed(d->base + INT_ERR2); + u32 i, irq_chan = 0; + + while (stat) { + i = __ffs(stat); + stat &= (stat - 1); + if (likely(tc1 & BIT(i))) { + p = &d->phy[i]; + c = p->vchan; + if (c) { + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + vchan_cookie_complete(&p->ds_run->vd); + p->ds_done = p->ds_run; + spin_unlock_irqrestore(&c->vc.lock, flags); + } + irq_chan |= BIT(i); + } + if (unlikely((err1 & BIT(i)) || (err2 & BIT(i)))) + dev_warn(d->slave.dev, "DMA ERR\n"); + } + + writel_relaxed(irq_chan, d->base + INT_TC1_RAW); + writel_relaxed(err1, d->base + INT_ERR1_RAW); + writel_relaxed(err2, d->base + INT_ERR2_RAW); + + if (irq_chan) { + tasklet_schedule(&d->task); + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + +static int k3_dma_start_txd(struct k3_dma_chan *c) +{ + struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device); + struct virt_dma_desc *vd = vchan_next_desc(&c->vc); + + if (!c->phy) + return -EAGAIN; + + if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d)) + return -EAGAIN; + + if (vd) { + struct k3_dma_desc_sw *ds = + container_of(vd, struct k3_dma_desc_sw, vd); + /* + * fetch and remove request from vc->desc_issued + * so vc->desc_issued only contains desc pending + */ + list_del(&ds->vd.node); + c->phy->ds_run = ds; + c->phy->ds_done = NULL; + /* start dma */ + k3_dma_set_desc(c->phy, &ds->desc_hw[0]); + return 0; + } + c->phy->ds_done = NULL; + c->phy->ds_run = NULL; + return -EAGAIN; +} + +static void k3_dma_tasklet(unsigned long arg) +{ + struct k3_dma_dev *d = (struct k3_dma_dev *)arg; + struct k3_dma_phy *p; + struct k3_dma_chan *c, *cn; + unsigned pch, pch_alloc = 0; + + /* check new dma request of running channel in vc->desc_issued */ + list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) { + spin_lock_irq(&c->vc.lock); + p = c->phy; + if (p && p->ds_done) { + if (k3_dma_start_txd(c)) { + /* No current txd associated with this channel */ + dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx); + /* Mark this channel free */ + c->phy = NULL; + p->vchan = NULL; + } + } + spin_unlock_irq(&c->vc.lock); + } + + /* check new channel request in d->chan_pending */ + spin_lock_irq(&d->lock); + for (pch = 0; pch < d->dma_channels; pch++) { + p = &d->phy[pch]; + + if (p->vchan == NULL && !list_empty(&d->chan_pending)) { + c = list_first_entry(&d->chan_pending, + struct k3_dma_chan, node); + /* remove from d->chan_pending */ + list_del_init(&c->node); + pch_alloc |= 1 << pch; + /* Mark this channel allocated */ + p->vchan = c; + c->phy = p; + dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc); + } + } + spin_unlock_irq(&d->lock); + + for (pch = 0; pch < d->dma_channels; pch++) { + if (pch_alloc & (1 << pch)) { + p = &d->phy[pch]; + c = p->vchan; + if (c) { + spin_lock_irq(&c->vc.lock); + k3_dma_start_txd(c); + spin_unlock_irq(&c->vc.lock); + } + } + } +} + +static int k3_dma_alloc_chan_resources(struct dma_chan *chan) +{ + return 0; +} + +static void k3_dma_free_chan_resources(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + unsigned long flags; + + spin_lock_irqsave(&d->lock, flags); + list_del_init(&c->node); + spin_unlock_irqrestore(&d->lock, flags); + + vchan_free_chan_resources(&c->vc); + c->ccfg = 0; +} + +static enum dma_status k3_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + struct k3_dma_phy *p; + struct virt_dma_desc *vd; + unsigned long flags; + enum dma_status ret; + size_t bytes = 0; + + ret = dma_cookie_status(&c->vc.chan, cookie, state); + if (ret == DMA_SUCCESS) + return ret; + + spin_lock_irqsave(&c->vc.lock, flags); + p = c->phy; + ret = c->status; + + /* + * If the cookie is on our issue queue, then the residue is + * its total size. + */ + vd = vchan_find_desc(&c->vc, cookie); + if (vd) { + bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size; + } else if ((!p) || (!p->ds_run)) { + bytes = 0; + } else { + struct k3_dma_desc_sw *ds = p->ds_run; + u32 clli = 0, index = 0; + + bytes = k3_dma_get_curr_cnt(d, p); + clli = k3_dma_get_curr_lli(p); + index = (clli - ds->desc_hw_lli) / sizeof(struct k3_desc_hw); + for (; index < ds->desc_num; index++) { + bytes += ds->desc_hw[index].count; + /* end of lli */ + if (!ds->desc_hw[index].lli) + break; + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); + dma_set_residue(state, bytes); + return ret; +} + +static void k3_dma_issue_pending(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + /* add request to vc->desc_issued */ + if (vchan_issue_pending(&c->vc)) { + spin_lock(&d->lock); + if (!c->phy) { + if (list_empty(&c->node)) { + /* if new channel, add chan_pending */ + list_add_tail(&c->node, &d->chan_pending); + /* check in tasklet */ + tasklet_schedule(&d->task); + dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc); + } + } + spin_unlock(&d->lock); + } else + dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc); + spin_unlock_irqrestore(&c->vc.lock, flags); +} + +static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst, + dma_addr_t src, size_t len, u32 num, u32 ccfg) +{ + if ((num + 1) < ds->desc_num) + ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) * + sizeof(struct k3_desc_hw); + ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN; + ds->desc_hw[num].count = len; + ds->desc_hw[num].saddr = src; + ds->desc_hw[num].daddr = dst; + ds->desc_hw[num].config = ccfg; +} + +static struct dma_async_tx_descriptor *k3_dma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_desc_sw *ds; + size_t copy = 0; + int num = 0; + + if (!len) + return NULL; + + num = DIV_ROUND_UP(len, DMA_MAX_SIZE); + ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC); + if (!ds) { + dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc); + return NULL; + } + ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]); + ds->size = len; + ds->desc_num = num; + num = 0; + + if (!c->ccfg) { + /* default is memtomem, without calling device_control */ + c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN; + c->ccfg |= (0xf << 20) | (0xf << 24); /* burst = 16 */ + c->ccfg |= (0x3 << 12) | (0x3 << 16); /* width = 64 bit */ + } + + do { + copy = min_t(size_t, len, DMA_MAX_SIZE); + k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg); + + if (c->dir == DMA_MEM_TO_DEV) { + src += copy; + } else if (c->dir == DMA_DEV_TO_MEM) { + dst += copy; + } else { + src += copy; + dst += copy; + } + len -= copy; + } while (len); + + ds->desc_hw[num-1].lli = 0; /* end of link */ + return vchan_tx_prep(&c->vc, &ds->vd, flags); +} + +static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen, + enum dma_transfer_direction dir, unsigned long flags, void *context) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_desc_sw *ds; + size_t len, avail, total = 0; + struct scatterlist *sg; + dma_addr_t addr, src = 0, dst = 0; + int num = sglen, i; + + if (sgl == 0) + return NULL; + + for_each_sg(sgl, sg, sglen, i) { + avail = sg_dma_len(sg); + if (avail > DMA_MAX_SIZE) + num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1; + } + + ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC); + if (!ds) { + dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc); + return NULL; + } + ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]); + ds->desc_num = num; + num = 0; + + for_each_sg(sgl, sg, sglen, i) { + addr = sg_dma_address(sg); + avail = sg_dma_len(sg); + total += avail; + + do { + len = min_t(size_t, avail, DMA_MAX_SIZE); + + if (dir == DMA_MEM_TO_DEV) { + src = addr; + dst = c->dev_addr; + } else if (dir == DMA_DEV_TO_MEM) { + src = c->dev_addr; + dst = addr; + } + + k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg); + + addr += len; + avail -= len; + } while (avail); + } + + ds->desc_hw[num-1].lli = 0; /* end of link */ + ds->size = total; + return vchan_tx_prep(&c->vc, &ds->vd, flags); +} + +static int k3_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, + unsigned long arg) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + struct dma_slave_config *cfg = (void *)arg; + struct k3_dma_phy *p = c->phy; + unsigned long flags; + u32 maxburst = 0, val = 0; + enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + LIST_HEAD(head); + + switch (cmd) { + case DMA_SLAVE_CONFIG: + if (cfg == NULL) + return -EINVAL; + c->dir = cfg->direction; + if (c->dir == DMA_DEV_TO_MEM) { + c->ccfg = CX_CFG_DSTINCR; + c->dev_addr = cfg->src_addr; + maxburst = cfg->src_maxburst; + width = cfg->src_addr_width; + } else if (c->dir == DMA_MEM_TO_DEV) { + c->ccfg = CX_CFG_SRCINCR; + c->dev_addr = cfg->dst_addr; + maxburst = cfg->dst_maxburst; + width = cfg->dst_addr_width; + } + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + case DMA_SLAVE_BUSWIDTH_2_BYTES: + case DMA_SLAVE_BUSWIDTH_4_BYTES: + case DMA_SLAVE_BUSWIDTH_8_BYTES: + val = __ffs(width); + break; + default: + val = 3; + break; + } + c->ccfg |= (val << 12) | (val << 16); + + if ((maxburst == 0) || (maxburst > 16)) + val = 16; + else + val = maxburst - 1; + c->ccfg |= (val << 20) | (val << 24); + c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN; + + /* specific request line */ + c->ccfg |= c->vc.chan.chan_id << 4; + break; + + case DMA_TERMINATE_ALL: + dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc); + + /* Prevent this channel being scheduled */ + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + + /* Clear the tx descriptor lists */ + spin_lock_irqsave(&c->vc.lock, flags); + vchan_get_all_descriptors(&c->vc, &head); + if (p) { + /* vchan is assigned to a pchan - stop the channel */ + k3_dma_terminate_chan(p, d); + c->phy = NULL; + p->vchan = NULL; + p->ds_run = p->ds_done = NULL; + } + spin_unlock_irqrestore(&c->vc.lock, flags); + vchan_dma_desc_free_list(&c->vc, &head); + break; + + case DMA_PAUSE: + dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc); + if (c->status == DMA_IN_PROGRESS) { + c->status = DMA_PAUSED; + if (p) { + k3_dma_pause_dma(p, false); + } else { + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + } + } + break; + + case DMA_RESUME: + dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc); + spin_lock_irqsave(&c->vc.lock, flags); + if (c->status == DMA_PAUSED) { + c->status = DMA_IN_PROGRESS; + if (p) { + k3_dma_pause_dma(p, true); + } else if (!list_empty(&c->vc.desc_issued)) { + spin_lock(&d->lock); + list_add_tail(&c->node, &d->chan_pending); + spin_unlock(&d->lock); + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); + break; + default: + return -ENXIO; + } + return 0; +} + +static void k3_dma_free_desc(struct virt_dma_desc *vd) +{ + struct k3_dma_desc_sw *ds = + container_of(vd, struct k3_dma_desc_sw, vd); + + kfree(ds); +} + +static struct of_device_id k3_pdma_dt_ids[] = { + { .compatible = "hisilicon,k3-dma-1.0", }, + {} +}; +MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids); + +static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct k3_dma_dev *d = ofdma->of_dma_data; + unsigned int request = dma_spec->args[0]; + + if (request > d->dma_requests) + return NULL; + + return dma_get_slave_channel(&(d->chans[request].vc.chan)); +} + +static int k3_dma_probe(struct platform_device *op) +{ + struct k3_dma_dev *d; + const struct of_device_id *of_id; + struct resource *iores; + int i, ret, irq = 0; + + iores = platform_get_resource(op, IORESOURCE_MEM, 0); + if (!iores) + return -EINVAL; + + d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + + d->base = devm_request_and_ioremap(&op->dev, iores); + if (!d->base) + return -EADDRNOTAVAIL; + + of_id = of_match_device(k3_pdma_dt_ids, &op->dev); + if (of_id) { + of_property_read_u32((&op->dev)->of_node, + "dma-channels", &d->dma_channels); + of_property_read_u32((&op->dev)->of_node, + "dma-requests", &d->dma_requests); + } + + d->clk = devm_clk_get(&op->dev, NULL); + if (IS_ERR(d->clk)) { + dev_err(&op->dev, "no dma clk\n"); + return PTR_ERR(d->clk); + } + + irq = platform_get_irq(op, 0); + ret = devm_request_irq(&op->dev, irq, + k3_dma_int_handler, IRQF_DISABLED, DRIVER_NAME, d); + if (ret) + return ret; + + /* init phy channel */ + d->phy = devm_kzalloc(&op->dev, + d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL); + if (d->phy == NULL) + return -ENOMEM; + + for (i = 0; i < d->dma_channels; i++) { + struct k3_dma_phy *p = &d->phy[i]; + + p->idx = i; + p->base = d->base + i * 0x40; + } + + INIT_LIST_HEAD(&d->slave.channels); + dma_cap_set(DMA_SLAVE, d->slave.cap_mask); + dma_cap_set(DMA_MEMCPY, d->slave.cap_mask); + d->slave.dev = &op->dev; + d->slave.device_alloc_chan_resources = k3_dma_alloc_chan_resources; + d->slave.device_free_chan_resources = k3_dma_free_chan_resources; + d->slave.device_tx_status = k3_dma_tx_status; + d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy; + d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg; + d->slave.device_issue_pending = k3_dma_issue_pending; + d->slave.device_control = k3_dma_control; + d->slave.copy_align = DMA_ALIGN; + d->slave.chancnt = d->dma_requests; + + /* init virtual channel */ + d->chans = devm_kzalloc(&op->dev, + d->dma_requests * sizeof(struct k3_dma_chan), GFP_KERNEL); + if (d->chans == NULL) + return -ENOMEM; + + for (i = 0; i < d->dma_requests; i++) { + struct k3_dma_chan *c = &d->chans[i]; + + c->status = DMA_IN_PROGRESS; + INIT_LIST_HEAD(&c->node); + c->vc.desc_free = k3_dma_free_desc; + vchan_init(&c->vc, &d->slave); + } + + /* Enable clock before accessing registers */ + ret = clk_prepare_enable(d->clk); + if (ret < 0) { + dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret); + return ret; + } + + k3_dma_enable_dma(d, true); + + ret = dma_async_device_register(&d->slave); + if (ret) + return ret; + + ret = of_dma_controller_register((&op->dev)->of_node, + k3_of_dma_simple_xlate, d); + if (ret) + goto of_dma_register_fail; + + spin_lock_init(&d->lock); + INIT_LIST_HEAD(&d->chan_pending); + tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d); + platform_set_drvdata(op, d); + dev_info(&op->dev, "initialized\n"); + + return 0; + +of_dma_register_fail: + dma_async_device_unregister(&d->slave); + return ret; +} + +static int k3_dma_remove(struct platform_device *op) +{ + struct k3_dma_chan *c, *cn; + struct k3_dma_dev *d = platform_get_drvdata(op); + + dma_async_device_unregister(&d->slave); + of_dma_controller_free((&op->dev)->of_node); + + list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) { + list_del(&c->vc.chan.device_node); + tasklet_kill(&c->vc.task); + } + tasklet_kill(&d->task); + clk_disable_unprepare(d->clk); + return 0; +} + +static int k3_dma_suspend(struct device *dev) +{ + struct k3_dma_dev *d = dev_get_drvdata(dev); + u32 stat = 0; + + stat = k3_dma_get_chan_stat(d); + if (stat) { + dev_warn(d->slave.dev, + "chan %d is running fail to suspend\n", stat); + return -1; + } + k3_dma_enable_dma(d, false); + clk_disable_unprepare(d->clk); + return 0; +} + +static int k3_dma_resume(struct device *dev) +{ + struct k3_dma_dev *d = dev_get_drvdata(dev); + int ret = 0; + + ret = clk_prepare_enable(d->clk); + if (ret < 0) { + dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret); + return ret; + } + k3_dma_enable_dma(d, true); + return 0; +} + +SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend, k3_dma_resume); + +static struct platform_driver k3_pdma_driver = { + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + .pm = &k3_dma_pmops, + .of_match_table = k3_pdma_dt_ids, + }, + .probe = k3_dma_probe, + .remove = k3_dma_remove, +}; + +module_platform_driver(k3_pdma_driver); + +MODULE_DESCRIPTION("Hisilicon k3 DMA Driver"); +MODULE_ALIAS("platform:k3dma"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3