[PATCH RESEND 2/2] MTD: autcpu12-nvram: Convert driver to platform_device
Alexander Shiyan
shc_work at mail.ru
Wed Aug 15 12:28:06 EDT 2012
Because we can have a single kernel to support multiple machines, we
need to make loading specific drivers for the target platform only.
For this, driver is converted to the platform driver.
Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
---
arch/arm/mach-clps711x/autcpu12.c | 19 +++++
drivers/mtd/maps/Kconfig | 2 +-
drivers/mtd/maps/autcpu12-nvram.c | 150 ++++++++++++++++++++-----------------
3 files changed, 101 insertions(+), 70 deletions(-)
diff --git a/arch/arm/mach-clps711x/autcpu12.c b/arch/arm/mach-clps711x/autcpu12.c
index 3fb79a1..3287191 100644
--- a/arch/arm/mach-clps711x/autcpu12.c
+++ b/arch/arm/mach-clps711x/autcpu12.c
@@ -23,6 +23,8 @@
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
#include <mach/hardware.h>
#include <asm/sizes.h>
@@ -62,9 +64,26 @@ void __init autcpu12_map_io(void)
iotable_init(autcpu12_io_desc, ARRAY_SIZE(autcpu12_io_desc));
}
+static struct resource autcpu12_nvram_resource[] __initdata = {
+ DEFINE_RES_MEM_NAMED(AUTCPU12_PHYS_NVRAM, SZ_128K, "SRAM"),
+};
+
+static struct platform_device autcpu12_nvram_pdev __initdata = {
+ .name = "autcpu12_nvram",
+ .id = -1,
+ .resource = autcpu12_nvram_resource,
+ .num_resources = ARRAY_SIZE(autcpu12_nvram_resource),
+};
+
+static void __init autcpu12_init(void)
+{
+ platform_device_register(&autcpu12_nvram_pdev);
+}
+
MACHINE_START(AUTCPU12, "autronix autcpu12")
/* Maintainer: Thomas Gleixner */
.atag_offset = 0x20000,
+ .init_machine = autcpu12_init,
.map_io = autcpu12_map_io,
.init_irq = clps711x_init_irq,
.timer = &clps711x_timer,
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 5ba2458..283f922 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -373,7 +373,7 @@ config MTD_FORTUNET
have such a board, say 'Y'.
config MTD_AUTCPU12
- tristate "NV-RAM mapping AUTCPU12 board"
+ bool "NV-RAM mapping AUTCPU12 board"
depends on ARCH_AUTCPU12
help
This enables access to the NV-RAM on autronix autcpu12 board.
diff --git a/drivers/mtd/maps/autcpu12-nvram.c b/drivers/mtd/maps/autcpu12-nvram.c
index 0598d52..6f9ab62 100644
--- a/drivers/mtd/maps/autcpu12-nvram.c
+++ b/drivers/mtd/maps/autcpu12-nvram.c
@@ -15,44 +15,57 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
*/
+#include <linux/sizes.h>
-#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
-#include <linux/ioport.h>
#include <linux/init.h>
-#include <asm/io.h>
-#include <asm/sizes.h>
-#include <mach/hardware.h>
-#include <mach/autcpu12.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
-#include <linux/mtd/partitions.h>
-
-
-static struct mtd_info *sram_mtd;
-struct map_info autcpu12_sram_map = {
- .name = "SRAM",
- .size = 32768,
- .bankwidth = 4,
- .phys = 0x12000000,
+struct autcpu12_nvram_priv {
+ struct mtd_info *mtd;
+ struct map_info map;
};
-static int __init init_autcpu12_sram (void)
+static int __devinit autcpu12_nvram_probe(struct platform_device *pdev)
{
map_word tmp, save0, save1;
+ struct resource *res;
+ struct autcpu12_nvram_priv *priv;
int err;
- autcpu12_sram_map.virt = ioremap(0x12000000, SZ_128K);
- if (!autcpu12_sram_map.virt) {
- printk("Failed to ioremap autcpu12 NV-RAM space\n");
- err = -EIO;
+ priv = devm_kzalloc(&pdev->dev,
+ sizeof(struct autcpu12_nvram_priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to get memory resource\n");
+ err = -ENOENT;
goto out;
}
- simple_map_init(&autcpu12_sram_map);
+
+ priv->map.bankwidth = 4;
+ priv->map.phys = res->start;
+ priv->map.size = resource_size(res);
+ priv->map.virt = devm_request_and_ioremap(&pdev->dev, res);
+ strcpy((char *)priv->map.name, res->name);
+ if (!priv->map.virt) {
+ dev_err(&pdev->dev, "failed to remap mem resource\n");
+ err = -EBUSY;
+ goto out;
+ }
+
+ simple_map_init(&priv->map);
/*
* Check for 32K/128K
@@ -62,67 +75,66 @@ static int __init init_autcpu12_sram (void)
* Read and check result on ofs 0x0
* Restore contents
*/
- save0 = map_read(&autcpu12_sram_map, 0);
- save1 = map_read(&autcpu12_sram_map, 0x10000);
+ save0 = map_read(&priv->map, 0);
+ save1 = map_read(&priv->map, 0x10000);
tmp.x[0] = ~save0.x[0];
- map_write(&autcpu12_sram_map, tmp, 0x10000);
- /* if we find this pattern on 0x0, we have 32K size
- * restore contents and exit
- */
- tmp = map_read(&autcpu12_sram_map, 0);
- if (!map_word_equal(&autcpu12_sram_map, tmp, save0)) {
- map_write(&autcpu12_sram_map, save0, 0x0);
- goto map;
- }
- /* We have a 128K found, restore 0x10000 and set size
- * to 128K
- */
- map_write(&autcpu12_sram_map, save1, 0x10000);
- autcpu12_sram_map.size = SZ_128K;
-
-map:
- sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map);
- if (!sram_mtd) {
- printk("NV-RAM probe failed\n");
+ map_write(&priv->map, tmp, 0x10000);
+ tmp = map_read(&priv->map, 0);
+ /* if we find this pattern on 0x0, we have 32K size */
+ if (!map_word_equal(&priv->map, tmp, save0)) {
+ map_write(&priv->map, save0, 0x0);
+ priv->map.size = SZ_32K;
+ } else
+ map_write(&priv->map, save1, 0x10000);
+
+ priv->mtd = do_map_probe("map_ram", &priv->map);
+ if (!priv->mtd) {
+ dev_err(&pdev->dev, "probing failed\n");
err = -ENXIO;
- goto out_ioremap;
+ goto out;
}
- sram_mtd->owner = THIS_MODULE;
- sram_mtd->erasesize = 16;
-
- if (mtd_device_register(sram_mtd, NULL, 0)) {
- printk("NV-RAM device addition failed\n");
- err = -ENOMEM;
- goto out_probe;
+ priv->mtd->owner = THIS_MODULE;
+ priv->mtd->erasesize = 16;
+ priv->mtd->dev.parent = &pdev->dev;
+ if (!mtd_device_register(priv->mtd, NULL, 0)) {
+ dev_info(&pdev->dev,
+ "NV-RAM device size %ldKiB registered on AUTCPU12\n",
+ priv->map.size / SZ_1K);
+ return 0;
}
- printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K);
-
- return 0;
-
-out_probe:
- map_destroy(sram_mtd);
- sram_mtd = 0;
+ map_destroy(priv->mtd);
+ dev_err(&pdev->dev, "NV-RAM device addition failed\n");
+ err = -ENOMEM;
-out_ioremap:
- iounmap((void *)autcpu12_sram_map.virt);
out:
+ devm_kfree(&pdev->dev, priv);
+
return err;
}
-static void __exit cleanup_autcpu12_maps(void)
+static int __devexit autcpu12_nvram_remove(struct platform_device *pdev)
{
- if (sram_mtd) {
- mtd_device_unregister(sram_mtd);
- map_destroy(sram_mtd);
- iounmap((void *)autcpu12_sram_map.virt);
- }
+ struct autcpu12_nvram_priv *priv = platform_get_drvdata(pdev);
+
+ mtd_device_unregister(priv->mtd);
+ map_destroy(priv->mtd);
+ devm_kfree(&pdev->dev, priv);
+
+ return 0;
}
-module_init(init_autcpu12_sram);
-module_exit(cleanup_autcpu12_maps);
+static struct platform_driver autcpu12_nvram_driver = {
+ .driver = {
+ .name = "autcpu12_nvram",
+ .owner = THIS_MODULE,
+ },
+ .probe = autcpu12_nvram_probe,
+ .remove = __devexit_p(autcpu12_nvram_remove),
+};
+module_platform_driver(autcpu12_nvram_driver);
MODULE_AUTHOR("Thomas Gleixner");
-MODULE_DESCRIPTION("autcpu12 NV-RAM map driver");
+MODULE_DESCRIPTION("autcpu12 NVRAM map driver");
MODULE_LICENSE("GPL");
--
1.7.8.6
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