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author | Marek Vasut <marek.vasut@gmail.com> | 2010-07-28 03:32:05 +0200 |
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committer | Eric Miao <eric.y.miao@gmail.com> | 2010-08-05 14:32:47 +0800 |
commit | e6a8ef54774fb01f0cf7c6d3679c76a0b60fab3b (patch) | |
tree | 495af67ab5461584fa0655ba45464802464ab75c | |
parent | 02a453e4a5a7ca8c8801140f412d327686112e4e (diff) | |
download | op-kernel-dev-e6a8ef54774fb01f0cf7c6d3679c76a0b60fab3b.zip op-kernel-dev-e6a8ef54774fb01f0cf7c6d3679c76a0b60fab3b.tar.gz |
[ARM] pxa/balloon3: Add NAND driver
The NAND support is implemented through the gen_nand driver.
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
-rw-r--r-- | arch/arm/mach-pxa/balloon3.c | 151 | ||||
-rw-r--r-- | arch/arm/mach-pxa/include/mach/balloon3.h | 28 |
2 files changed, 176 insertions, 3 deletions
diff --git a/arch/arm/mach-pxa/balloon3.c b/arch/arm/mach-pxa/balloon3.c index 6f594bd..e2eb0b7 100644 --- a/arch/arm/mach-pxa/balloon3.c +++ b/arch/arm/mach-pxa/balloon3.c @@ -27,6 +27,8 @@ #include <linux/mtd/partitions.h> #include <linux/types.h> #include <linux/i2c/pcf857x.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/physmap.h> #include <asm/setup.h> #include <asm/mach-types.h> @@ -530,6 +532,154 @@ static inline void balloon3_i2c_init(void) {} #endif /****************************************************************************** + * NAND + ******************************************************************************/ +#if defined(CONFIG_MTD_NAND_PLATFORM)||defined(CONFIG_MTD_NAND_PLATFORM_MODULE) +static uint16_t balloon3_ctl = + BALLOON3_NAND_CONTROL_FLCE0 | BALLOON3_NAND_CONTROL_FLCE1 | + BALLOON3_NAND_CONTROL_FLCE2 | BALLOON3_NAND_CONTROL_FLCE3 | + BALLOON3_NAND_CONTROL_FLWP; + +static void balloon3_nand_cmd_ctl(struct mtd_info *mtd, int cmd, unsigned int ctrl) +{ + struct nand_chip *this = mtd->priv; + + if (ctrl & NAND_CTRL_CHANGE) { + if (ctrl & NAND_CLE) + balloon3_ctl |= BALLOON3_NAND_CONTROL_FLCLE; + else + balloon3_ctl &= ~BALLOON3_NAND_CONTROL_FLCLE; + + if (ctrl & NAND_ALE) + balloon3_ctl |= BALLOON3_NAND_CONTROL_FLALE; + else + balloon3_ctl &= ~BALLOON3_NAND_CONTROL_FLALE; + + __raw_writel(balloon3_ctl, BALLOON3_NAND_CONTROL_REG); + } + + if (cmd != NAND_CMD_NONE) + writeb(cmd, this->IO_ADDR_W); +} + +static void balloon3_nand_select_chip(struct mtd_info *mtd, int chip) +{ + if (chip < 0 || chip > 3) + return; + + balloon3_ctl |= BALLOON3_NAND_CONTROL_FLCE0 | + BALLOON3_NAND_CONTROL_FLCE1 | + BALLOON3_NAND_CONTROL_FLCE2 | + BALLOON3_NAND_CONTROL_FLCE3; + + /* Deassert correct nCE line */ + balloon3_ctl &= ~(BALLOON3_NAND_CONTROL_FLCE0 << chip); + + __raw_writew(balloon3_ctl, BALLOON3_NAND_CONTROL_REG); +} + +static int balloon3_nand_probe(struct platform_device *pdev) +{ + void __iomem *temp_map; + uint16_t ver; + int ret; + + __raw_writew(BALLOON3_NAND_CONTROL2_16BIT, BALLOON3_NAND_CONTROL2_REG); + + ver = __raw_readw(BALLOON3_FPGA_VER); + if (ver > 0x0201) + pr_warn("The FPGA code, version 0x%04x, is newer than rel-0.3. " + "NAND support might be broken in this version!", ver); + + /* Power up the NAND chips */ + ret = gpio_request(BALLOON3_GPIO_RUN_NAND, "NAND"); + if (ret) + goto err1; + + ret = gpio_direction_output(BALLOON3_GPIO_RUN_NAND, 1); + if (ret) + goto err2; + + gpio_set_value(BALLOON3_GPIO_RUN_NAND, 1); + + /* Deassert all nCE lines and write protect line */ + __raw_writel(balloon3_ctl, BALLOON3_NAND_CONTROL_REG); + return 0; + +err2: + gpio_free(BALLOON3_GPIO_RUN_NAND); +err1: + return ret; +} + +static void balloon3_nand_remove(struct platform_device *pdev) +{ + /* Power down the NAND chips */ + gpio_set_value(BALLOON3_GPIO_RUN_NAND, 0); + gpio_free(BALLOON3_GPIO_RUN_NAND); +} + +static struct mtd_partition balloon3_partition_info[] = { + [0] = { + .name = "Boot", + .offset = 0, + .size = SZ_4M, + }, + [1] = { + .name = "RootFS", + .offset = MTDPART_OFS_APPEND, + .size = MTDPART_SIZ_FULL + }, +}; + +static const char *balloon3_part_probes[] = { "cmdlinepart", NULL }; + +struct platform_nand_data balloon3_nand_pdata = { + .chip = { + .nr_chips = 4, + .chip_offset = 0, + .nr_partitions = ARRAY_SIZE(balloon3_partition_info), + .partitions = balloon3_partition_info, + .chip_delay = 50, + .part_probe_types = balloon3_part_probes, + }, + .ctrl = { + .hwcontrol = 0, + .dev_ready = 0, + .select_chip = balloon3_nand_select_chip, + .cmd_ctrl = balloon3_nand_cmd_ctl, + .probe = balloon3_nand_probe, + .remove = balloon3_nand_remove, + }, +}; + +static struct resource balloon3_nand_resource[] = { + [0] = { + .start = BALLOON3_NAND_BASE, + .end = BALLOON3_NAND_BASE + 0x4, + .flags = IORESOURCE_MEM, + }, +}; + +static struct platform_device balloon3_nand = { + .name = "gen_nand", + .num_resources = ARRAY_SIZE(balloon3_nand_resource), + .resource = balloon3_nand_resource, + .id = -1, + .dev = { + .platform_data = &balloon3_nand_pdata, + } +}; + +static void __init balloon3_nand_init(void) +{ + platform_device_register(&balloon3_nand); +} +#else +static inline void balloon3_nand_init(void) {} +#endif + +/****************************************************************************** * Machine init ******************************************************************************/ static void __init balloon3_init(void) @@ -547,6 +697,7 @@ static void __init balloon3_init(void) balloon3_lcd_init(); balloon3_leds_init(); balloon3_mmc_init(); + balloon3_nand_init(); balloon3_nor_init(); balloon3_ts_init(); balloon3_udc_init(); diff --git a/arch/arm/mach-pxa/include/mach/balloon3.h b/arch/arm/mach-pxa/include/mach/balloon3.h index 238f887..eec92e6 100644 --- a/arch/arm/mach-pxa/include/mach/balloon3.h +++ b/arch/arm/mach-pxa/include/mach/balloon3.h @@ -31,12 +31,15 @@ enum balloon3_features { #define BALLOON3_CF_CONTROL_REG (BALLOON3_FPGA_VIRT + 0x00e00008) /* FPGA / CPLD version register */ #define BALLOON3_FPGA_VER (BALLOON3_FPGA_VIRT + 0x00e0001c) +/* FPGA / CPLD registers for NAND flash */ +#define BALLOON3_NAND_BASE (PXA_CS4_PHYS + 0x00e00000) +#define BALLOON3_NAND_IO_REG (BALLOON3_FPGA_VIRT + 0x00e00000) +#define BALLOON3_NAND_CONTROL2_REG (BALLOON3_FPGA_VIRT + 0x00e00010) +#define BALLOON3_NAND_STAT_REG (BALLOON3_FPGA_VIRT + 0x00e00010) +#define BALLOON3_NAND_CONTROL_REG (BALLOON3_FPGA_VIRT + 0x00e00014) -#define BALLOON3_NANDIO_IO_REG (BALLOON3_FPGA_VIRT + 0x00e00000) /* fpga/cpld interrupt control register */ #define BALLOON3_INT_CONTROL_REG (BALLOON3_FPGA_VIRT + 0x00e0000C) -#define BALLOON3_NANDIO_CTL2_REG (BALLOON3_FPGA_VIRT + 0x00e00010) -#define BALLOON3_NANDIO_CTL_REG (BALLOON3_FPGA_VIRT + 0x00e00014) #define BALLOON3_VERSION_REG (BALLOON3_FPGA_VIRT + 0x00e0001c) #define BALLOON3_SAMOSA_ADDR_REG (BALLOON3_FPGA_VIRT + 0x00c00000) @@ -56,6 +59,22 @@ enum balloon3_features { #define BALLOON3_BP_CF_NRDY_IRQ BALLOON3_IRQ(0) #define BALLOON3_BP_NSTSCHG_IRQ BALLOON3_IRQ(1) +/* NAND Control register */ +#define BALLOON3_NAND_CONTROL_FLWP (1 << 7) +#define BALLOON3_NAND_CONTROL_FLSE (1 << 6) +#define BALLOON3_NAND_CONTROL_FLCE3 (1 << 5) +#define BALLOON3_NAND_CONTROL_FLCE2 (1 << 4) +#define BALLOON3_NAND_CONTROL_FLCE1 (1 << 3) +#define BALLOON3_NAND_CONTROL_FLCE0 (1 << 2) +#define BALLOON3_NAND_CONTROL_FLALE (1 << 1) +#define BALLOON3_NAND_CONTROL_FLCLE (1 << 0) + +/* NAND Status register */ +#define BALLOON3_NAND_STAT_RNB (1 << 0) + +/* NAND Control2 register */ +#define BALLOON3_NAND_CONTROL2_16BIT (1 << 0) + /* GPIOs for irqs */ #define BALLOON3_GPIO_AUX_NIRQ (94) #define BALLOON3_GPIO_CODEC_IRQ (95) @@ -69,6 +88,9 @@ enum balloon3_features { #define BALLOON3_GPIO_S0_CD (105) +/* NAND */ +#define BALLOON3_GPIO_RUN_NAND (102) + /* PCF8574A Leds */ #define BALLOON3_PCF_GPIO_BASE 160 #define BALLOON3_PCF_GPIO_LED0 (BALLOON3_PCF_GPIO_BASE + 0) |