[PATCH v3 1/3] omap3 gpmc: functionality enhancement
Sukumar Ghorai
s-ghorai at ti.com
Tue May 18 07:16:27 EDT 2010
few functions added in gpmc module and to be used by other drivers like NAND.
E.g.: - ioctl function
- ecc functions
Signed-off-by: Sukumar Ghorai <s-ghorai at ti.com>
---
arch/arm/mach-omap2/gpmc.c | 246 +++++++++++++++++++++++++++++++-
arch/arm/plat-omap/include/plat/gpmc.h | 35 ++++-
drivers/mtd/nand/omap2.c | 4 +-
3 files changed, 274 insertions(+), 11 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index 5bc3ca0..7e6d821
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -46,8 +46,9 @@
#define GPMC_ECC_CONFIG 0x1f4
#define GPMC_ECC_CONTROL 0x1f8
#define GPMC_ECC_SIZE_CONFIG 0x1fc
+#define GPMC_ECC1_RESULT 0x200
-#define GPMC_CS0 0x60
+#define GPMC_CS0_BASE 0x60
#define GPMC_CS_SIZE 0x30
#define GPMC_MEM_START 0x00000000
@@ -92,7 +93,9 @@ struct omap3_gpmc_regs {
static struct resource gpmc_mem_root;
static struct resource gpmc_cs_mem[GPMC_CS_NUM];
static DEFINE_SPINLOCK(gpmc_mem_lock);
-static unsigned gpmc_cs_map;
+static unsigned int gpmc_cs_map; /* flag for cs which are initialized */
+static int gpmc_pref_used = -EINVAL; /* cs using prefetch engine */
+static int gpmc_ecc_used = -EINVAL; /* cs using ecc engine */
static void __iomem *gpmc_base;
@@ -108,11 +111,27 @@ static u32 gpmc_read_reg(int idx)
return __raw_readl(gpmc_base + idx);
}
+static void gpmc_cs_write_byte(int cs, int idx, u8 val)
+{
+ void __iomem *reg_addr;
+
+ reg_addr = gpmc_base + GPMC_CS0_BASE + (cs * GPMC_CS_SIZE) + idx;
+ __raw_writeb(val, reg_addr);
+}
+
+static u8 gpmc_cs_read_byte(int cs, int idx)
+{
+ void __iomem *reg_addr;
+
+ reg_addr = gpmc_base + GPMC_CS0_BASE + (cs * GPMC_CS_SIZE) + idx;
+ return __raw_readb(reg_addr);
+}
+
void gpmc_cs_write_reg(int cs, int idx, u32 val)
{
void __iomem *reg_addr;
- reg_addr = gpmc_base + GPMC_CS0 + (cs * GPMC_CS_SIZE) + idx;
+ reg_addr = gpmc_base + GPMC_CS0_BASE + (cs * GPMC_CS_SIZE) + idx;
__raw_writel(val, reg_addr);
}
@@ -120,7 +139,7 @@ u32 gpmc_cs_read_reg(int cs, int idx)
{
void __iomem *reg_addr;
- reg_addr = gpmc_base + GPMC_CS0 + (cs * GPMC_CS_SIZE) + idx;
+ reg_addr = gpmc_base + GPMC_CS0_BASE + (cs * GPMC_CS_SIZE) + idx;
return __raw_readl(reg_addr);
}
@@ -419,8 +438,100 @@ void gpmc_cs_free(int cs)
EXPORT_SYMBOL(gpmc_cs_free);
/**
+ * gpmc_hwcontrol - hardware specific access (read/ write) control
+ * @cs: chip select number
+ * @cmd: command type
+ * @write: 1 for write; 0 for read
+ * @wval: value to write
+ * @rval: read pointer
+ */
+int gpmc_hwcontrol(int cs, int cmd, int write, int wval, int *rval)
+{
+ u32 regval = 0;
+
+ if (!write && !rval)
+ return -EINVAL;
+
+ switch (cmd) {
+ case GPMC_STATUS_BUFFER:
+ regval = gpmc_read_reg(GPMC_STATUS);
+ /* 1 : buffer is available to write */
+ *rval = regval & GPMC_STATUS_BUFF_EMPTY;
+ break;
+
+ case GPMC_GET_SET_IRQ_STATUS:
+ if (write)
+ gpmc_write_reg(GPMC_IRQSTATUS, wval);
+ else
+ *rval = gpmc_read_reg(GPMC_IRQSTATUS);
+ break;
+
+ case GPMC_PREFETCH_FIFO_CNT:
+ regval = gpmc_read_reg(GPMC_PREFETCH_STATUS);
+ *rval = GPMC_PREFETCH_STATUS_FIFO_CNT(regval);
+ break;
+
+ case GPMC_PREFETCH_COUNT:
+ regval = gpmc_read_reg(GPMC_PREFETCH_STATUS);
+ *rval = GPMC_PREFETCH_STATUS_COUNT(regval);
+ break;
+
+ case GPMC_CONFIG_WP:
+ regval = gpmc_read_reg(GPMC_CONFIG);
+ if (wval)
+ regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
+ else
+ regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */
+ gpmc_write_reg(GPMC_CONFIG, regval);
+ break;
+
+ case GPMC_CONFIG_RDY_BSY:
+ regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
+ regval |= WR_RD_PIN_MONITORING;
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
+ break;
+
+ case GPMC_CONFIG_DEV_SIZE:
+ regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
+ regval |= GPMC_CONFIG1_DEVICESIZE(wval);
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
+ break;
+
+ case GPMC_CONFIG_DEV_TYPE:
+ regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
+ regval |= GPMC_CONFIG1_DEVICETYPE(wval);
+ if (wval == GPMC_DEVICETYPE_NOR)
+ regval |= GPMC_CONFIG1_MUXADDDATA;
+ gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
+ break;
+
+ case GPMC_NAND_COMMAND:
+ gpmc_cs_write_byte(cs, GPMC_CS_NAND_COMMAND, wval);
+ break;
+
+ case GPMC_NAND_ADDRESS:
+ gpmc_cs_write_byte(cs, GPMC_CS_NAND_ADDRESS, wval);
+ break;
+
+ case GPMC_NAND_DATA:
+ if (write)
+ gpmc_cs_write_byte(cs, GPMC_CS_NAND_DATA, wval);
+ else
+ *rval = gpmc_cs_read_byte(cs, GPMC_CS_NAND_DATA);
+ break;
+
+ default:
+ printk(KERN_ERR "gpmc_hwcontrol: Not supported\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(gpmc_hwcontrol);
+
+/**
* gpmc_prefetch_enable - configures and starts prefetch transfer
- * @cs: nand cs (chip select) number
+ * @cs: cs (chip select) number
* @dma_mode: dma mode enable (1) or disable (0)
* @u32_count: number of bytes to be transferred
* @is_write: prefetch read(0) or write post(1) mode
@@ -430,6 +541,11 @@ int gpmc_prefetch_enable(int cs, int dma_mode,
{
uint32_t prefetch_config1;
+ if (gpmc_pref_used == -EINVAL)
+ gpmc_pref_used = cs;
+ else
+ return -EBUSY;
+
if (!(gpmc_read_reg(GPMC_PREFETCH_CONTROL))) {
/* Set the amount of bytes to be prefetched */
gpmc_write_reg(GPMC_PREFETCH_CONFIG2, u32_count);
@@ -456,13 +572,20 @@ EXPORT_SYMBOL(gpmc_prefetch_enable);
/**
* gpmc_prefetch_reset - disables and stops the prefetch engine
*/
-void gpmc_prefetch_reset(void)
+int gpmc_prefetch_reset(int cs)
{
+ if (gpmc_pref_used == cs)
+ gpmc_pref_used = -EINVAL;
+ else
+ return -EINVAL;
+
/* Stop the PFPW engine */
gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x0);
/* Reset/disable the PFPW engine */
gpmc_write_reg(GPMC_PREFETCH_CONFIG1, 0x0);
+
+ return 0;
}
EXPORT_SYMBOL(gpmc_prefetch_reset);
@@ -615,3 +738,114 @@ void omap3_gpmc_restore_context(void)
}
}
#endif /* CONFIG_ARCH_OMAP3 */
+
+/**
+ * gpmc_ecc_init - initialize hw ecc for device in GPMC controller
+ * @cs: chip select number
+ * @ecc_size: number of bytes for ecc generation
+ */
+
+int gpmc_ecc_init(int cs, int ecc_size)
+{
+ unsigned int val = 0x0;
+
+ /* check if ecc engine already by another cs */
+ if (gpmc_ecc_used == -EINVAL)
+ gpmc_ecc_used = cs;
+ else
+ return -EBUSY;
+
+ /* read ecc control register */
+ val = gpmc_read_reg(GPMC_ECC_CONTROL);
+
+ /* clear ecc and enable bits */
+ val = ((0x00000001<<8) | 0x00000001);
+ gpmc_write_reg(GPMC_ECC_CONTROL, val);
+
+ /* Read from ECC Size Config Register */
+ val = gpmc_read_reg(GPMC_ECC_SIZE_CONFIG);
+
+ /* program ecc and result sizes */
+ val = ((((ecc_size >> 1) - 1) << 22) | (0x0000000F));
+ gpmc_write_reg(GPMC_ECC_SIZE_CONFIG, val);
+
+ return 0;
+}
+
+/**
+ * gpmc_calculate_ecc - generate non-inverted ecc bytes
+ * @cs: chip select number
+ * @dat: data pointer over which ecc is computed
+ * @ecc_code: ecc code buffer
+ *
+ * Using non-inverted ECC is considered ugly since writing a blank
+ * page (padding) will clear the ECC bytes. This is not a problem as long
+ * no one is trying to write data on the seemingly unused page. Reading
+ * an erased page will produce an ECC mismatch between generated and read
+ * ECC bytes that has to be dealt with separately.
+ */
+int gpmc_calculate_ecc(int cs, const u_char *dat, u_char *ecc_code)
+{
+ unsigned int val = 0x0;
+
+ if (gpmc_ecc_used != cs)
+ return -EINVAL;
+
+ /* read ecc result */
+ val = gpmc_read_reg(GPMC_ECC1_RESULT);
+ *ecc_code++ = val; /* P128e, ..., P1e */
+ *ecc_code++ = val >> 16; /* P128o, ..., P1o */
+ /* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */
+ *ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0);
+
+ return 0;
+}
+
+/**
+ * gpmc_enable_hwecc - enable hardware ecc functionality
+ * @cs: chip select number
+ * @mode: read/write mode
+ * @dev_width: device bus width(1 for x16, 0 for x8)
+ */
+int gpmc_enable_hwecc(int cs, int mode, int dev_width)
+{
+ unsigned int val;
+
+ if (gpmc_ecc_used != cs)
+ return -EINVAL;
+
+ switch (mode) {
+ case GPMC_ECC_READ:
+ gpmc_write_reg(GPMC_ECC_CONTROL, 0x101);
+ break;
+ case GPMC_ECC_READSYN:
+ gpmc_write_reg(GPMC_ECC_CONTROL, 0x100);
+ break;
+ case GPMC_ECC_WRITE:
+ gpmc_write_reg(GPMC_ECC_CONTROL, 0x101);
+ break;
+ default:
+ printk(KERN_INFO "Error: Unrecognized Mode[%d]!\n", mode);
+ break;
+ }
+
+ /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
+ val = (dev_width << 7) | (cs << 1) | (0x1);
+ gpmc_write_reg(GPMC_ECC_CONFIG, val);
+ return 0;
+}
+
+/**
+ * gmpc_ecc_reset - release the HW ECC in GPMC controller
+ * @cs: Chip select number
+ */
+int gpmc_ecc_reset(int cs)
+{
+ if (gpmc_ecc_used == cs)
+ gpmc_ecc_used = -EINVAL;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
diff --git a/arch/arm/plat-omap/include/plat/gpmc.h b/arch/arm/plat-omap/include/plat/gpmc.h
index 145838a..67a3442
--- a/arch/arm/plat-omap/include/plat/gpmc.h
+++ b/arch/arm/plat-omap/include/plat/gpmc.h
@@ -27,8 +27,24 @@
#define GPMC_CONFIG 0x50
#define GPMC_STATUS 0x54
-#define GPMC_CS0_BASE 0x60
-#define GPMC_CS_SIZE 0x30
+
+/* Control Commands */
+#define GPMC_CONFIG_WP 0x00000001
+#define GPMC_CONFIG_RDY_BSY 0x00000002
+#define GPMC_CONFIG_DEV_SIZE 0x00000003
+#define GPMC_CONFIG_DEV_TYPE 0x00000004
+#define GPMC_NAND_COMMAND 0x00000005
+#define GPMC_NAND_ADDRESS 0x00000006
+#define GPMC_NAND_DATA 0x00000007
+#define GPMC_STATUS_BUFFER 0x00000008 /* 1: buffer is available to write */
+#define GPMC_PREFETCH_FIFO_CNT 0x00000009 /* bytes available in FIFO for r/w */
+#define GPMC_PREFETCH_COUNT 0x0000000A /* remaining bytes to be read/write*/
+#define GPMC_GET_SET_IRQ_STATUS 0x0000000B
+
+/* ECC commands */
+#define GPMC_ECC_READ 0 /* Reset Hardware ECC for read */
+#define GPMC_ECC_WRITE 1 /* Reset Hardware ECC for write */
+#define GPMC_ECC_READSYN 2 /* Reset before syndrom is read back */
#define GPMC_CONFIG1_WRAPBURST_SUPP (1 << 31)
#define GPMC_CONFIG1_READMULTIPLE_SUPP (1 << 30)
@@ -56,6 +72,14 @@
#define GPMC_CONFIG1_FCLK_DIV4 (GPMC_CONFIG1_FCLK_DIV(3))
#define GPMC_CONFIG7_CSVALID (1 << 6)
+#define GPMC_DEVICETYPE_NOR 0
+#define GPMC_DEVICETYPE_NAND 2
+#define GPMC_CONFIG_WRITEPROTECT 0x00000010
+#define GPMC_STATUS_BUFF_EMPTY 0x00000001
+#define WR_RD_PIN_MONITORING 0x00600000
+#define GPMC_PREFETCH_STATUS_FIFO_CNT(val) ((val & 0x7f000000) >> 24)
+#define GPMC_PREFETCH_STATUS_COUNT(val) (val & 0x00003fff)
+
/*
* Note that all values in this struct are in nanoseconds, while
* the register values are in gpmc_fck cycles.
@@ -108,10 +132,15 @@ extern int gpmc_cs_set_reserved(int cs, int reserved);
extern int gpmc_cs_reserved(int cs);
extern int gpmc_prefetch_enable(int cs, int dma_mode,
unsigned int u32_count, int is_write);
-extern void gpmc_prefetch_reset(void);
+extern int gpmc_prefetch_reset(int cs);
extern int gpmc_prefetch_status(void);
extern void omap3_gpmc_save_context(void);
extern void omap3_gpmc_restore_context(void);
extern void gpmc_init(void);
+extern int gpmc_hwcontrol(int cs, int cmd, int write, int wval, int *rval);
+int gpmc_ecc_init(int cs, int ecc_size);
+int gpmc_enable_hwecc(int cs, int mode, int dev_width);
+int gpmc_calculate_ecc(int cs, const u_char *dat, u_char *ecc_code);
+int gpmc_ecc_reset(int cs);
#endif
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 7545568..206406b
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -316,7 +316,7 @@ static void omap_read_buf_pref(struct mtd_info *mtd, u_char *buf, int len)
} while (len);
/* disable and stop the PFPW engine */
- gpmc_prefetch_reset();
+ gpmc_prefetch_reset(info->gpmc_cs);
}
}
@@ -360,7 +360,7 @@ static void omap_write_buf_pref(struct mtd_info *mtd,
}
/* disable and stop the PFPW engine */
- gpmc_prefetch_reset();
+ gpmc_prefetch_reset(info->gpmc_cs);
}
}
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