staging: gpib: use ioport_map

The tnt4882 backend has a rather elabolate way of abstracting the
PIO and MMIO based hardware variants, duplicating the functionality
of ioport_map() in a less portable way.

Change it to use ioport_map() with ioread8()/iowrite8() to do
this more easily.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241213064959.1045243-2-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 23 insertions, 89 deletions

diff --git a/drivers/staging/gpib/Kconfig b/drivers/staging/gpib/Kconfig
index 275dbc32b28d..81510db3072e 100644
--- a/drivers/staging/gpib/Kconfig
+++ b/drivers/staging/gpib/Kconfig
@@ -66,6 +66,7 @@ config GPIB_NI_PCI_ISA
 	depends on HAS_IOPORT
 	depends on !X86_PAE
 	depends on PCMCIA || !PCMCIA
+	depends on HAS_IOPORT_MAP
 	select GPIB_COMMON
 	select GPIB_NEC7210
 	help
diff --git a/drivers/staging/gpib/common/gpib_os.c b/drivers/staging/gpib/common/gpib_os.c
index f25e7c458581..0fb93a9f395f 100644
--- a/drivers/staging/gpib/common/gpib_os.c
+++ b/drivers/staging/gpib/common/gpib_os.c
@@ -116,56 +116,6 @@ int io_timed_out(gpib_board_t *board)
 	return 0;
 }
 
-void writeb_wrapper(unsigned int value, void *address)
-{
-	writeb(value, address);
-};
-EXPORT_SYMBOL(writeb_wrapper);
-
-void writew_wrapper(unsigned int value, void *address)
-{
-	writew(value, address);
-};
-EXPORT_SYMBOL(writew_wrapper);
-
-unsigned int readb_wrapper(void *address)
-{
-	return readb(address);
-};
-EXPORT_SYMBOL(readb_wrapper);
-
-unsigned int readw_wrapper(void *address)
-{
-	return readw(address);
-};
-EXPORT_SYMBOL(readw_wrapper);
-
-#ifdef CONFIG_HAS_IOPORT
-void outb_wrapper(unsigned int value, void *address)
-{
-	outb(value, (unsigned long)(address));
-};
-EXPORT_SYMBOL(outb_wrapper);
-
-void outw_wrapper(unsigned int value, void *address)
-{
-	outw(value, (unsigned long)(address));
-};
-EXPORT_SYMBOL(outw_wrapper);
-
-unsigned int inb_wrapper(void *address)
-{
-	return inb((unsigned long)(address));
-};
-EXPORT_SYMBOL(inb_wrapper);
-
-unsigned int inw_wrapper(void *address)
-{
-	return inw((unsigned long)(address));
-};
-EXPORT_SYMBOL(inw_wrapper);
-#endif
-
 /* this is a function instead of a constant because of Suse
  * defining HZ to be a function call to get_hz()
  */
diff --git a/drivers/staging/gpib/include/gpibP.h b/drivers/staging/gpib/include/gpibP.h
index 5fc42b645ab7..b97da577ba33 100644
--- a/drivers/staging/gpib/include/gpibP.h
+++ b/drivers/staging/gpib/include/gpibP.h
@@ -16,6 +16,7 @@
 
 #include <linux/fs.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
 
 void gpib_register_driver(gpib_interface_t *interface, struct module *mod);
 void gpib_unregister_driver(gpib_interface_t *interface);
@@ -35,16 +36,5 @@ extern gpib_board_t board_array[GPIB_MAX_NUM_BOARDS];
 
 extern struct list_head registered_drivers;
 
-#include <linux/io.h>
-
-void writeb_wrapper(unsigned int value, void *address);
-unsigned int readb_wrapper(void *address);
-void outb_wrapper(unsigned int value, void *address);
-unsigned int inb_wrapper(void *address);
-void writew_wrapper(unsigned int value, void *address);
-unsigned int readw_wrapper(void *address);
-void outw_wrapper(unsigned int value, void *address);
-unsigned int inw_wrapper(void *address);
-
 #endif	// _GPIB_P_H
 
diff --git a/drivers/staging/gpib/tnt4882/tnt4882_gpib.c b/drivers/staging/gpib/tnt4882/tnt4882_gpib.c
index e49a952fa0d8..408a123e9542 100644
--- a/drivers/staging/gpib/tnt4882/tnt4882_gpib.c
+++ b/drivers/staging/gpib/tnt4882/tnt4882_gpib.c
@@ -45,10 +45,6 @@ struct tnt4882_priv {
 	unsigned short imr0_bits;
 	unsigned short imr3_bits;
 	unsigned short auxg_bits;	// bits written to auxiliary register G
-	void (*io_writeb)(unsigned int value, void *address);
-	void (*io_writew)(unsigned int value, void *address);
-	unsigned int (*io_readb)(void *address);
-	unsigned int (*io_readw)(void *address);
 };
 
 // interface functions
@@ -104,17 +100,17 @@ static const int atgpib_iosize = 32;
 /* paged io */
 static inline unsigned int tnt_paged_readb(struct tnt4882_priv *priv, unsigned long offset)
 {
-	priv->io_writeb(AUX_PAGEIN, priv->nec7210_priv.iobase + AUXMR * priv->nec7210_priv.offset);
+	iowrite8(AUX_PAGEIN, priv->nec7210_priv.iobase + AUXMR * priv->nec7210_priv.offset);
 	udelay(1);
-	return priv->io_readb(priv->nec7210_priv.iobase + offset);
+	return ioread8(priv->nec7210_priv.iobase + offset);
 }
 
 static inline void tnt_paged_writeb(struct tnt4882_priv *priv, unsigned int value,
 				    unsigned long offset)
 {
-	priv->io_writeb(AUX_PAGEIN, priv->nec7210_priv.iobase + AUXMR * priv->nec7210_priv.offset);
+	iowrite8(AUX_PAGEIN, priv->nec7210_priv.iobase + AUXMR * priv->nec7210_priv.offset);
 	udelay(1);
-	priv->io_writeb(value, priv->nec7210_priv.iobase + offset);
+	iowrite8(value, priv->nec7210_priv.iobase + offset);
 }
 
 /* readb/writeb wrappers */
@@ -134,7 +130,7 @@ static inline unsigned short tnt_readb(struct tnt4882_priv *priv, unsigned long
 		switch (priv->nec7210_priv.type) {
 		case TNT4882:
 		case TNT5004:
-			retval = priv->io_readb(address);
+			retval = ioread8(address);
 			break;
 		case NAT4882:
 			retval = tnt_paged_readb(priv, offset - tnt_pagein_offset);
@@ -149,7 +145,7 @@ static inline unsigned short tnt_readb(struct tnt4882_priv *priv, unsigned long
 		}
 		break;
 	default:
-		retval = priv->io_readb(address);
+		retval = ioread8(address);
 		break;
 	}
 	spin_unlock_irqrestore(register_lock, flags);
@@ -170,7 +166,7 @@ static inline void tnt_writeb(struct tnt4882_priv *priv, unsigned short value, u
 		switch (priv->nec7210_priv.type) {
 		case TNT4882:
 		case TNT5004:
-			priv->io_writeb(value, address);
+			iowrite8(value, address);
 			break;
 		case NAT4882:
 			tnt_paged_writeb(priv, value, offset - tnt_pagein_offset);
@@ -183,7 +179,7 @@ static inline void tnt_writeb(struct tnt4882_priv *priv, unsigned short value, u
 		}
 		break;
 	default:
-		priv->io_writeb(value, address);
+		iowrite8(value, address);
 		break;
 	}
 	spin_unlock_irqrestore(register_lock, flags);
@@ -288,7 +284,7 @@ static int drain_fifo_words(struct tnt4882_priv *tnt_priv, uint8_t *buffer, int
 	while (fifo_word_available(tnt_priv) && count + 2 <= num_bytes)	{
 		short word;
 
-		word = tnt_priv->io_readw(nec_priv->iobase + FIFOB);
+		word = ioread16(nec_priv->iobase + FIFOB);
 		buffer[count++] = word & 0xff;
 		buffer[count++] = (word >> 8) & 0xff;
 	}
@@ -573,7 +569,7 @@ static int generic_write(gpib_board_t *board, uint8_t *buffer, size_t length,
 			word = buffer[count++] & 0xff;
 			if (count < length)
 				word |= (buffer[count++] << 8) & 0xff00;
-			tnt_priv->io_writew(word, nec_priv->iobase + FIFOB);
+			iowrite16(word, nec_priv->iobase + FIFOB);
 		}
 //  avoid unnecessary HR_NFF interrupts
 //		tnt_priv->imr3_bits |= HR_NFF;
@@ -1269,10 +1265,6 @@ int ni_pci_attach(gpib_board_t *board, const gpib_board_config_t *config)
 	if (tnt4882_allocate_private(board))
 		return -ENOMEM;
 	tnt_priv = board->private_data;
-	tnt_priv->io_writeb = writeb_wrapper;
-	tnt_priv->io_readb = readb_wrapper;
-	tnt_priv->io_writew = writew_wrapper;
-	tnt_priv->io_readw = readw_wrapper;
 	nec_priv = &tnt_priv->nec7210_priv;
 	nec_priv->type = TNT4882;
 	nec_priv->read_byte = nec7210_locking_iomem_read_byte;
@@ -1408,10 +1400,6 @@ static int ni_isa_attach_common(gpib_board_t *board, const gpib_board_config_t *
 	if (tnt4882_allocate_private(board))
 		return -ENOMEM;
 	tnt_priv = board->private_data;
-	tnt_priv->io_writeb = outb_wrapper;
-	tnt_priv->io_readb = inb_wrapper;
-	tnt_priv->io_writew = outw_wrapper;
-	tnt_priv->io_readw = inw_wrapper;
 	nec_priv = &tnt_priv->nec7210_priv;
 	nec_priv->type = chipset;
 	nec_priv->read_byte = nec7210_locking_ioport_read_byte;
@@ -1438,7 +1426,9 @@ static int ni_isa_attach_common(gpib_board_t *board, const gpib_board_config_t *
 		pr_err("tnt4882: failed to allocate ioports\n");
 		return -1;
 	}
-	nec_priv->iobase = iobase;
+	nec_priv->iobase = ioport_map(iobase, atgpib_iosize);
+	if (!nec_priv->iobase)
+		return -1;
 
 	// get irq
 	if (request_irq(irq, tnt4882_interrupt, isr_flags, "atgpib", board)) {
@@ -1479,6 +1469,8 @@ void ni_isa_detach(gpib_board_t *board)
 		if (tnt_priv->irq)
 			free_irq(tnt_priv->irq, board);
 		if (nec_priv->iobase)
+			ioport_unmap(nec_priv->iobase);
+		if (nec_priv->iobase)
 			release_region((unsigned long)(nec_priv->iobase), atgpib_iosize);
 		if (tnt_priv->pnp_dev)
 			pnp_device_detach(tnt_priv->pnp_dev);
@@ -1817,10 +1809,6 @@ int ni_pcmcia_attach(gpib_board_t *board, const gpib_board_config_t *config)
 	if (tnt4882_allocate_private(board))
 		return -ENOMEM;
 	tnt_priv = board->private_data;
-	tnt_priv->io_writeb = outb_wrapper;
-	tnt_priv->io_readb = inb_wrapper;
-	tnt_priv->io_writew = outw_wrapper;
-	tnt_priv->io_readw = inw_wrapper;
 	nec_priv = &tnt_priv->nec7210_priv;
 	nec_priv->type = TNT4882;
 	nec_priv->read_byte = nec7210_locking_ioport_read_byte;
@@ -1835,7 +1823,10 @@ int ni_pcmcia_attach(gpib_board_t *board, const gpib_board_config_t *config)
 		return -EIO;
 	}
 
-	nec_priv->iobase = (void *)(unsigned long)curr_dev->resource[0]->start;
+	nec_priv->iobase = ioport_map(curr_dev->resource[0]->start,
+					resource_size(curr_dev->resource[0]));
+	if (!nec_priv->iobase)
+		return -1;
 
 	// get irq
 	if (request_irq(curr_dev->irq, tnt4882_interrupt, isr_flags, "tnt4882", board))	{
@@ -1860,6 +1851,8 @@ void ni_pcmcia_detach(gpib_board_t *board)
 		nec_priv = &tnt_priv->nec7210_priv;
 		if (tnt_priv->irq)
 			free_irq(tnt_priv->irq, board);
+		if (nec_priv->iobase)
+			ioport_unmap(nec_priv->iobase);
 		if (nec_priv->iobase) {
 			tnt4882_board_reset(tnt_priv, board);
 			release_region((unsigned long)nec_priv->iobase, pcmcia_gpib_iosize);