[PATCH 14/18] MTD: nand: make au1550nd.c a platform_driver
Manuel Lauss
manuel.lauss at googlemail.com
Tue Nov 1 15:03:40 EDT 2011
Transform the au1550nd.c driver into a platform_driver and hook it
up in the PB1550 board (gen_nand works fine on the DB1550, but since
I don't have a PB1550 to test this driver stays for now).
Cc: linux-mtd at lists.infradead.org
Signed-off-by: Manuel Lauss <manuel.lauss at googlemail.com>
---
Tested on the DB1550 as well.
I'd like for this to go in via the MIPS tree if at all possible.
arch/mips/alchemy/devboards/pb1550.c | 66 ++++++
arch/mips/include/asm/mach-au1x00/au1550nd.h | 16 ++
drivers/mtd/nand/au1550nd.c | 308 +++++++++++---------------
3 files changed, 215 insertions(+), 175 deletions(-)
create mode 100644 arch/mips/include/asm/mach-au1x00/au1550nd.h
diff --git a/arch/mips/alchemy/devboards/pb1550.c b/arch/mips/alchemy/devboards/pb1550.c
index e4a00a5..b37e7de 100644
--- a/arch/mips/alchemy/devboards/pb1550.c
+++ b/arch/mips/alchemy/devboards/pb1550.c
@@ -24,6 +24,7 @@
#include <linux/platform_device.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>
+#include <asm/mach-au1x00/au1550nd.h>
#include <asm/mach-au1x00/gpio.h>
#include <asm/mach-db1x00/bcsr.h>
#include "platform.h"
@@ -131,6 +132,67 @@ static struct platform_device pb1550_i2c_dev = {
.resource = au1550_psc2_res,
};
+static struct mtd_partition pb1550_nand_parts[] = {
+ [0] = {
+ .name = "NAND FS 0",
+ .offset = 0,
+ .size = 8 * 1024 * 1024,
+ },
+ [1] = {
+ .name = "NAND FS 1",
+ .offset = MTDPART_OFS_APPEND,
+ .size = MTDPART_SIZ_FULL,
+ },
+};
+
+static struct au1550nd_platdata pb1550_nand_pd = {
+ .parts = pb1550_nand_parts,
+ .num_parts = ARRAY_SIZE(pb1550_nand_parts),
+ .devwidth = 0, /* x8 NAND default, needs fixing up */
+};
+
+static struct resource pb1550_nand_res[] = {
+ [0] = {
+ .start = 0x20000000,
+ .end = 0x20000fff,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct platform_device pb1550_nand_dev = {
+ .name = "au1550-nand",
+ .id = -1,
+ .resource = pb1550_nand_res,
+ .num_resources = ARRAY_SIZE(pb1550_nand_res),
+ .dev = {
+ .platform_data = &pb1550_nand_pd,
+ },
+};
+
+static void __init pb1550_nand_setup(void)
+{
+ int boot_swapboot = (au_readl(MEM_STSTAT) & (0x7 << 1)) |
+ ((bcsr_read(BCSR_STATUS) >> 6) & 0x1);
+
+ switch (boot_swapboot) {
+ case 0:
+ case 2:
+ case 8:
+ case 0xC:
+ case 0xD:
+ /* x16 NAND Flash */
+ pb1550_nand_pd.devwidth = 1;
+ /* fallthrough */
+ case 1:
+ case 9:
+ case 3:
+ case 0xE:
+ case 0xF:
+ /* x8 NAND, already set up */
+ platform_device_register(&pb1550_nand_dev);
+ }
+}
+
static int __init pb1550_dev_init(void)
{
int swapped;
@@ -168,6 +230,10 @@ static int __init pb1550_dev_init(void)
AU1000_PCMCIA_IO_PHYS_ADDR + 0x008010000 - 1,
AU1550_GPIO201_205_INT, AU1550_GPIO1_INT, 0, 0, 1);
+ /* NAND setup */
+ gpio_direction_input(206); /* GPIO206 high */
+ pb1550_nand_setup();
+
swapped = bcsr_read(BCSR_STATUS) & BCSR_STATUS_PB1550_SWAPBOOT;
db1x_register_norflash(128 * 1024 * 1024, 4, swapped);
platform_device_register(&pb1550_pci_host);
diff --git a/arch/mips/include/asm/mach-au1x00/au1550nd.h b/arch/mips/include/asm/mach-au1x00/au1550nd.h
new file mode 100644
index 0000000..ad4c0a0
--- /dev/null
+++ b/arch/mips/include/asm/mach-au1x00/au1550nd.h
@@ -0,0 +1,16 @@
+/*
+ * platform data for the Au1550 NAND driver
+ */
+
+#ifndef _AU1550ND_H_
+#define _AU1550ND_H_
+
+#include <linux/mtd/partitions.h>
+
+struct au1550nd_platdata {
+ struct mtd_partition *parts;
+ int num_parts;
+ int devwidth; /* 0 = 8bit device, 1 = 16bit device */
+};
+
+#endif
diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c
index fa5736b..bdebd5c 100644
--- a/drivers/mtd/nand/au1550nd.c
+++ b/drivers/mtd/nand/au1550nd.c
@@ -17,35 +17,19 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
+#include <linux/platform_device.h>
#include <asm/io.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1550nd.h>
-#ifdef CONFIG_MIPS_PB1550
-#include <asm/mach-pb1x00/pb1550.h>
-#elif defined(CONFIG_MIPS_DB1550)
-#include <asm/mach-db1x00/db1x00.h>
-#endif
-#include <asm/mach-db1x00/bcsr.h>
-/*
- * MTD structure for NAND controller
- */
-static struct mtd_info *au1550_mtd = NULL;
-static void __iomem *p_nand;
-static int nand_width = 1; /* default x8 */
-static void (*au1550_write_byte)(struct mtd_info *, u_char);
+struct au1550nd_ctx {
+ struct mtd_info info;
+ struct nand_chip chip;
-/*
- * Define partitions for flash device
- */
-static const struct mtd_partition partition_info[] = {
- {
- .name = "NAND FS 0",
- .offset = 0,
- .size = 8 * 1024 * 1024},
- {
- .name = "NAND FS 1",
- .offset = MTDPART_OFS_APPEND,
- .size = MTDPART_SIZ_FULL}
+ int cs;
+ void __iomem *base;
+ void (*write_byte)(struct mtd_info *, u_char);
};
/**
@@ -262,24 +246,25 @@ static int au_verify_buf16(struct mtd_info *mtd, const u_char *buf, int len)
static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
{
- register struct nand_chip *this = mtd->priv;
+ struct au1550nd_ctx *ctx = container_of(mtd, struct au1550nd_ctx, info);
+ struct nand_chip *this = mtd->priv;
switch (cmd) {
case NAND_CTL_SETCLE:
- this->IO_ADDR_W = p_nand + MEM_STNAND_CMD;
+ this->IO_ADDR_W = ctx->base + MEM_STNAND_CMD;
break;
case NAND_CTL_CLRCLE:
- this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
+ this->IO_ADDR_W = ctx->base + MEM_STNAND_DATA;
break;
case NAND_CTL_SETALE:
- this->IO_ADDR_W = p_nand + MEM_STNAND_ADDR;
+ this->IO_ADDR_W = ctx->base + MEM_STNAND_ADDR;
break;
case NAND_CTL_CLRALE:
- this->IO_ADDR_W = p_nand + MEM_STNAND_DATA;
+ this->IO_ADDR_W = ctx->base + MEM_STNAND_DATA;
/* FIXME: Nobody knows why this is necessary,
* but it works only that way */
udelay(1);
@@ -287,7 +272,7 @@ static void au1550_hwcontrol(struct mtd_info *mtd, int cmd)
case NAND_CTL_SETNCE:
/* assert (force assert) chip enable */
- au_writel((1 << (4 + NAND_CS)), MEM_STNDCTL);
+ au_writel((1 << (4 + ctx->cs)), MEM_STNDCTL);
break;
case NAND_CTL_CLRNCE:
@@ -334,9 +319,10 @@ static void au1550_select_chip(struct mtd_info *mtd, int chip)
*/
static void au1550_command(struct mtd_info *mtd, unsigned command, int column, int page_addr)
{
- register struct nand_chip *this = mtd->priv;
+ struct au1550nd_ctx *ctx = container_of(mtd, struct au1550nd_ctx, info);
+ struct nand_chip *this = mtd->priv;
int ce_override = 0, i;
- ulong flags;
+ unsigned long flags = 0;
/* Begin command latch cycle */
au1550_hwcontrol(mtd, NAND_CTL_SETCLE);
@@ -357,9 +343,9 @@ static void au1550_command(struct mtd_info *mtd, unsigned command, int column, i
column -= 256;
readcmd = NAND_CMD_READ1;
}
- au1550_write_byte(mtd, readcmd);
+ ctx->write_byte(mtd, readcmd);
}
- au1550_write_byte(mtd, command);
+ ctx->write_byte(mtd, command);
/* Set ALE and clear CLE to start address cycle */
au1550_hwcontrol(mtd, NAND_CTL_CLRCLE);
@@ -372,10 +358,10 @@ static void au1550_command(struct mtd_info *mtd, unsigned command, int column, i
/* Adjust columns for 16 bit buswidth */
if (this->options & NAND_BUSWIDTH_16)
column >>= 1;
- au1550_write_byte(mtd, column);
+ ctx->write_byte(mtd, column);
}
if (page_addr != -1) {
- au1550_write_byte(mtd, (u8)(page_addr & 0xff));
+ ctx->write_byte(mtd, (u8)(page_addr & 0xff));
if (command == NAND_CMD_READ0 ||
command == NAND_CMD_READ1 ||
@@ -393,11 +379,12 @@ static void au1550_command(struct mtd_info *mtd, unsigned command, int column, i
au1550_hwcontrol(mtd, NAND_CTL_SETNCE);
}
- au1550_write_byte(mtd, (u8)(page_addr >> 8));
+ ctx->write_byte(mtd, (u8)(page_addr >> 8));
/* One more address cycle for devices > 32MiB */
if (this->chipsize > (32 << 20))
- au1550_write_byte(mtd, (u8)((page_addr >> 16) & 0x0f));
+ ctx->write_byte(mtd,
+ ((page_addr >> 16) & 0x0f));
}
/* Latch in address */
au1550_hwcontrol(mtd, NAND_CTL_CLRALE);
@@ -443,121 +430,79 @@ static void au1550_command(struct mtd_info *mtd, unsigned command, int column, i
while(!this->dev_ready(mtd));
}
-
-/*
- * Main initialization routine
- */
-static int __init au1xxx_nand_init(void)
+static int __devinit find_nand_cs(unsigned long nand_base)
{
- struct nand_chip *this;
- u16 boot_swapboot = 0; /* default value */
- int retval;
- u32 mem_staddr;
- u32 nand_phys;
-
- /* Allocate memory for MTD device structure and private data */
- au1550_mtd = kzalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
- if (!au1550_mtd) {
- printk("Unable to allocate NAND MTD dev structure.\n");
- return -ENOMEM;
- }
-
- /* Get pointer to private data */
- this = (struct nand_chip *)(&au1550_mtd[1]);
-
- /* Link the private data with the MTD structure */
- au1550_mtd->priv = this;
- au1550_mtd->owner = THIS_MODULE;
-
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1000_STATIC_MEM_PHYS_ADDR);
+ unsigned long addr, staddr, start, mask, end;
+ int i;
- /* MEM_STNDCTL: disable ints, disable nand boot */
- au_writel(0, MEM_STNDCTL);
+ for (i = 0; i < 4; i++) {
+ addr = 0x1000 + (i * 0x10); /* CSx */
+ staddr = __raw_readl(base + addr + 0x08); /* STADDRx */
+ /* figure out the decoded range of this CS */
+ start = (staddr << 4) & 0xfffc0000;
+ mask = (staddr << 18) & 0xfffc0000;
+ end = (start | (start - 1)) & ~(start ^ mask);
+ if ((nand_base >= start) && (nand_base < end))
+ return i;
+ }
-#ifdef CONFIG_MIPS_PB1550
- /* set gpio206 high */
- gpio_direction_input(206);
+ return -ENODEV;
+}
- boot_swapboot = (au_readl(MEM_STSTAT) & (0x7 << 1)) | ((bcsr_read(BCSR_STATUS) >> 6) & 0x1);
+static int __devinit au1550nd_probe(struct platform_device *pdev)
+{
+ struct au1550nd_platdata *pd;
+ struct au1550nd_ctx *ctx;
+ struct nand_chip *this;
+ struct resource *r;
+ int ret, cs;
- switch (boot_swapboot) {
- case 0:
- case 2:
- case 8:
- case 0xC:
- case 0xD:
- /* x16 NAND Flash */
- nand_width = 0;
- break;
- case 1:
- case 9:
- case 3:
- case 0xE:
- case 0xF:
- /* x8 NAND Flash */
- nand_width = 1;
- break;
- default:
- printk("Pb1550 NAND: bad boot:swap\n");
- retval = -EINVAL;
- goto outmem;
- }
-#endif
-
- /* Configure chip-select; normally done by boot code, e.g. YAMON */
-#ifdef NAND_STCFG
- if (NAND_CS == 0) {
- au_writel(NAND_STCFG, MEM_STCFG0);
- au_writel(NAND_STTIME, MEM_STTIME0);
- au_writel(NAND_STADDR, MEM_STADDR0);
+ pd = pdev->dev.platform_data;
+ if (!pd) {
+ dev_err(&pdev->dev, "missing platform data\n");
+ return -ENODEV;
}
- if (NAND_CS == 1) {
- au_writel(NAND_STCFG, MEM_STCFG1);
- au_writel(NAND_STTIME, MEM_STTIME1);
- au_writel(NAND_STADDR, MEM_STADDR1);
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx) {
+ dev_err(&pdev->dev, "no memory for NAND context\n");
+ return -ENOMEM;
}
- if (NAND_CS == 2) {
- au_writel(NAND_STCFG, MEM_STCFG2);
- au_writel(NAND_STTIME, MEM_STTIME2);
- au_writel(NAND_STADDR, MEM_STADDR2);
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r) {
+ dev_err(&pdev->dev, "no NAND memory resource\n");
+ ret = -ENODEV;
+ goto out1;
}
- if (NAND_CS == 3) {
- au_writel(NAND_STCFG, MEM_STCFG3);
- au_writel(NAND_STTIME, MEM_STTIME3);
- au_writel(NAND_STADDR, MEM_STADDR3);
+ if (request_mem_region(r->start, resource_size(r), "au1550-nand")) {
+ dev_err(&pdev->dev, "cannot claim NAND memory area\n");
+ ret = -ENOMEM;
+ goto out1;
}
-#endif
-
- /* Locate NAND chip-select in order to determine NAND phys address */
- mem_staddr = 0x00000000;
- if (((au_readl(MEM_STCFG0) & 0x7) == 0x5) && (NAND_CS == 0))
- mem_staddr = au_readl(MEM_STADDR0);
- else if (((au_readl(MEM_STCFG1) & 0x7) == 0x5) && (NAND_CS == 1))
- mem_staddr = au_readl(MEM_STADDR1);
- else if (((au_readl(MEM_STCFG2) & 0x7) == 0x5) && (NAND_CS == 2))
- mem_staddr = au_readl(MEM_STADDR2);
- else if (((au_readl(MEM_STCFG3) & 0x7) == 0x5) && (NAND_CS == 3))
- mem_staddr = au_readl(MEM_STADDR3);
-
- if (mem_staddr == 0x00000000) {
- printk("Au1xxx NAND: ERROR WITH NAND CHIP-SELECT\n");
- kfree(au1550_mtd);
- return 1;
+
+ ctx->base = ioremap_nocache(r->start, 0x1000);
+ if (!ctx->base) {
+ dev_err(&pdev->dev, "cannot remap NAND memory area\n");
+ ret = -ENODEV;
+ goto out2;
}
- nand_phys = (mem_staddr << 4) & 0xFFFC0000;
- p_nand = ioremap(nand_phys, 0x1000);
+ this = &ctx->chip;
+ ctx->info.priv = this;
+ ctx->info.owner = THIS_MODULE;
- /* make controller and MTD agree */
- if (NAND_CS == 0)
- nand_width = au_readl(MEM_STCFG0) & (1 << 22);
- if (NAND_CS == 1)
- nand_width = au_readl(MEM_STCFG1) & (1 << 22);
- if (NAND_CS == 2)
- nand_width = au_readl(MEM_STCFG2) & (1 << 22);
- if (NAND_CS == 3)
- nand_width = au_readl(MEM_STCFG3) & (1 << 22);
+ /* figure out which CS# r->start belongs to */
+ cs = find_nand_cs(r->start);
+ if (cs < 0) {
+ dev_err(&pdev->dev, "cannot detect NAND chipselect\n");
+ ret = -ENODEV;
+ goto out3;
+ }
+ ctx->cs = cs;
- /* Set address of hardware control function */
this->dev_ready = au1550_device_ready;
this->select_chip = au1550_select_chip;
this->cmdfunc = au1550_command;
@@ -568,54 +513,67 @@ static int __init au1xxx_nand_init(void)
this->options = NAND_NO_AUTOINCR;
- if (!nand_width)
+ if (pd->devwidth)
this->options |= NAND_BUSWIDTH_16;
- this->read_byte = (!nand_width) ? au_read_byte16 : au_read_byte;
- au1550_write_byte = (!nand_width) ? au_write_byte16 : au_write_byte;
+ this->read_byte = (pd->devwidth) ? au_read_byte16 : au_read_byte;
+ ctx->write_byte = (pd->devwidth) ? au_write_byte16 : au_write_byte;
this->read_word = au_read_word;
- this->write_buf = (!nand_width) ? au_write_buf16 : au_write_buf;
- this->read_buf = (!nand_width) ? au_read_buf16 : au_read_buf;
- this->verify_buf = (!nand_width) ? au_verify_buf16 : au_verify_buf;
-
- /* Scan to find existence of the device */
- if (nand_scan(au1550_mtd, 1)) {
- retval = -ENXIO;
- goto outio;
+ this->write_buf = (pd->devwidth) ? au_write_buf16 : au_write_buf;
+ this->read_buf = (pd->devwidth) ? au_read_buf16 : au_read_buf;
+ this->verify_buf = (pd->devwidth) ? au_verify_buf16 : au_verify_buf;
+
+ ret = nand_scan(&ctx->info, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "NAND scan failed with %d\n", ret);
+ goto out3;
}
- /* Register the partitions */
- mtd_device_register(au1550_mtd, partition_info,
- ARRAY_SIZE(partition_info));
+ mtd_device_register(&ctx->info, pd->parts, pd->num_parts);
return 0;
- outio:
- iounmap(p_nand);
-
- outmem:
- kfree(au1550_mtd);
- return retval;
+out3:
+ iounmap(ctx->base);
+out2:
+ release_mem_region(r->start, resource_size(r));
+out1:
+ kfree(ctx);
+ return ret;
}
-module_init(au1xxx_nand_init);
-
-/*
- * Clean up routine
- */
-static void __exit au1550_cleanup(void)
+static int __devexit au1550nd_remove(struct platform_device *pdev)
{
- /* Release resources, unregister device */
- nand_release(au1550_mtd);
-
- /* Free the MTD device structure */
- kfree(au1550_mtd);
+ struct au1550nd_ctx *ctx = platform_get_drvdata(pdev);
+ struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- /* Unmap */
- iounmap(p_nand);
+ nand_release(&ctx->info);
+ iounmap(ctx->base);
+ release_mem_region(r->start, 0x1000);
+ kfree(ctx);
+ return 0;
}
-module_exit(au1550_cleanup);
+static struct platform_driver au1550nd_driver = {
+ .driver = {
+ .name = "au1550-nand",
+ .owner = THIS_MODULE,
+ },
+ .probe = au1550nd_probe,
+ .remove = __devexit_p(au1550nd_remove),
+};
+
+static int __init au1550nd_load(void)
+{
+ return platform_driver_register(&au1550nd_driver);
+};
+
+static void __exit au1550nd_exit(void)
+{
+ platform_driver_unregister(&au1550nd_driver);
+};
+module_init(au1550nd_load);
+module_exit(au1550nd_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Embedded Edge, LLC");
--
1.7.7.1
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