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mtd: nand: ams-delta: drop omap_read/write, use ioremap 

There is a common requirement for not using OMAP specific omap_readw() /
omap_writew() function calls in drivers/, but replace them with
readw() / writew() on ioremap()ped addresses passed from arch/ instead.

The patch implements this idea for the Amstrad Delta NAND driver. To be
able to use the modified driver, the board file is updated with the
platform device I/O resource declaration, which is passed from there.

Created and tested against linux-2.6.37-rc5, on top of recent patch
'MTD: NAND: ams-delta: convert to platform driver'.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Janusz Krzysztofik 2010-12-15 15:43:44 +01:00 committed by David Woodhouse
parent dcf12463c3
commit eaca491f75
2 changed files with 55 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm/mach-omap1/board-ams-delta.c
View File

@ -181,9 +181,20 @@ static struct omap_board_config_kernel ams_delta_config[] = {
{ OMAP_TAG_LCD, &ams_delta_lcd_config },
};
static struct resource ams_delta_nand_resources[] = {
[0] = {
.start = OMAP1_MPUIO_BASE,
.end = OMAP1_MPUIO_BASE +
OMAP_MPUIO_IO_CNTL + sizeof(u32) - 1,
.flags = IORESOURCE_MEM,
},
};
static struct platform_device ams_delta_nand_device = {
.name = "ams-delta-nand",
.id = -1
.id = -1,
.num_resources = ARRAY_SIZE(ams_delta_nand_resources),
.resource = ams_delta_nand_resources,
};
static struct resource ams_delta_kp_resources[] = {

49
drivers/mtd/nand/ams-delta.c
View File

@ -5,6 +5,7 @@
*
* Derived from drivers/mtd/toto.c
* Converted to platform driver by Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
* Partially stolen from drivers/mtd/nand/plat_nand.c
*
* 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
@ -63,9 +64,10 @@ static struct mtd_partition partition_info[] = {
static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte)
{
struct nand_chip *this = mtd->priv;
void __iomem *io_base = this->priv;
omap_writew(0, (OMAP1_MPUIO_BASE + OMAP_MPUIO_IO_CNTL));
omap_writew(byte, this->IO_ADDR_W);
writew(0, io_base + OMAP_MPUIO_IO_CNTL);
writew(byte, this->IO_ADDR_W);
ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NWE, 0);
ndelay(40);
ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NWE,
@ -76,11 +78,12 @@ static u_char ams_delta_read_byte(struct mtd_info *mtd)
{
u_char res;
struct nand_chip *this = mtd->priv;
void __iomem *io_base = this->priv;
ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NRE, 0);
ndelay(40);
omap_writew(~0, (OMAP1_MPUIO_BASE + OMAP_MPUIO_IO_CNTL));
res = omap_readw(this->IO_ADDR_R);
writew(~0, io_base + OMAP_MPUIO_IO_CNTL);
res = readw(this->IO_ADDR_R);
ams_delta_latch2_write(AMS_DELTA_LATCH2_NAND_NRE,
AMS_DELTA_LATCH2_NAND_NRE);
@ -155,8 +158,13 @@ static int ams_delta_nand_ready(struct mtd_info *mtd)
static int __devinit ams_delta_init(struct platform_device *pdev)
{
struct nand_chip *this;
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
void __iomem *io_base;
int err = 0;
if (!res)
return -ENXIO;
/* Allocate memory for MTD device structure and private data */
ams_delta_mtd = kmalloc(sizeof(struct mtd_info) +
sizeof(struct nand_chip), GFP_KERNEL);
@ -178,9 +186,25 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
/* Link the private data with the MTD structure */
ams_delta_mtd->priv = this;
if (!request_mem_region(res->start, resource_size(res),
dev_name(&pdev->dev))) {
dev_err(&pdev->dev, "request_mem_region failed\n");
err = -EBUSY;
goto out_free;
}
io_base = ioremap(res->start, resource_size(res));
if (io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n");
err = -EIO;
goto out_release_io;
}
this->priv = io_base;
/* Set address of NAND IO lines */
this->IO_ADDR_R = (OMAP1_MPUIO_BASE + OMAP_MPUIO_INPUT_LATCH);
this->IO_ADDR_W = (OMAP1_MPUIO_BASE + OMAP_MPUIO_OUTPUT);
this->IO_ADDR_R = io_base + OMAP_MPUIO_INPUT_LATCH;
this->IO_ADDR_W = io_base + OMAP_MPUIO_OUTPUT;
this->read_byte = ams_delta_read_byte;
this->write_buf = ams_delta_write_buf;
this->read_buf = ams_delta_read_buf;
@ -196,6 +220,8 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
this->chip_delay = 30;
this->ecc.mode = NAND_ECC_SOFT;
platform_set_drvdata(pdev, io_base);
/* Set chip enabled, but */
ams_delta_latch2_write(NAND_MASK, AMS_DELTA_LATCH2_NAND_NRE |
AMS_DELTA_LATCH2_NAND_NWE |
@ -215,6 +241,11 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
goto out;
out_mtd:
platform_set_drvdata(pdev, NULL);
iounmap(io_base);
out_release_io:
release_mem_region(res->start, resource_size(res));
out_free:
kfree(ams_delta_mtd);
out:
return err;
@ -225,9 +256,15 @@ static int __devinit ams_delta_init(struct platform_device *pdev)
*/
static int __devexit ams_delta_cleanup(struct platform_device *pdev)
{
void __iomem *io_base = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* Release resources, unregister device */
nand_release(ams_delta_mtd);
iounmap(io_base);
release_mem_region(res->start, resource_size(res));
/* Free the MTD device structure */
kfree(ams_delta_mtd);