diff options
author | Manuel Lauss <manuel.lauss@googlemail.com> | 2011-12-08 14:42:10 +0400 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2011-12-08 14:42:10 +0400 |
commit | b67a1a02d463b5b298cc718ca971738fe20f0ab9 (patch) | |
tree | 3523ca7826a356e1bf1a8ac878056a4fbeb73434 /drivers/mtd/nand/au1550nd.c | |
parent | 1c043f16a01c144305e952025e883b55706f2450 (diff) | |
download | linux-b67a1a02d463b5b298cc718ca971738fe20f0ab9.tar.xz |
MTD: nand: make au1550nd.c a platform_driver
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).
Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: linux-mtd@lists.infradead.org
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2875/
Patchwork: https://patchwork.linux-mips.org/patch/3160/
Acked-by: Artem Bityutskiy <dedekind1@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/mtd/nand/au1550nd.c')
-rw-r--r-- | drivers/mtd/nand/au1550nd.c | 298 |
1 files changed, 123 insertions, 175 deletions
diff --git a/drivers/mtd/nand/au1550nd.c b/drivers/mtd/nand/au1550nd.c index 7dd3700f2303..73abbc3e093e 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); }; /** @@ -259,24 +243,25 @@ 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); @@ -284,7 +269,7 @@ 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: @@ -331,9 +316,10 @@ 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); @@ -354,9 +340,9 @@ 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); @@ -369,10 +355,10 @@ 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 || @@ -390,11 +376,12 @@ 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); @@ -440,121 +427,79 @@ 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; + pd = pdev->dev.platform_data; + if (!pd) { + dev_err(&pdev->dev, "missing platform data\n"); + return -ENODEV; } -#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); - } - 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; @@ -565,54 +510,57 @@ 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); + struct au1550nd_ctx *ctx = platform_get_drvdata(pdev); + struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - /* Free the MTD device structure */ - kfree(au1550_mtd); - - /* 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), +}; + +module_platform_driver(au1550nd_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Embedded Edge, LLC"); |