* [PATCH 1/3 v2] mtd omap2 nand driver: extend to work with omap3 boards
@ 2008-08-04 15:58 Dirk Behme
2008-08-04 16:27 ` Koen Kooi
0 siblings, 1 reply; 2+ messages in thread
From: Dirk Behme @ 2008-08-04 15:58 UTC (permalink / raw)
To: linux-omap@vger.kernel.org; +Cc: Steve Sakoman
[-- Attachment #1: Type: text/plain, Size: 267 bytes --]
From: Teerth Reddy <teerth@ti.com>, Steve Sakoman <steve@sakoman.com>,
Dirk Behme <dirk.behme@gmail.com>
Extend omap2 mtd nand driver to work with ARCH_OMAP3 boards
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
[-- Attachment #2: 1_nand.txt --]
[-- Type: text/plain, Size: 13292 bytes --]
Index: linux-beagle/drivers/mtd/nand/Kconfig
===================================================================
--- linux-beagle.orig/drivers/mtd/nand/Kconfig
+++ linux-beagle/drivers/mtd/nand/Kconfig
@@ -70,10 +70,10 @@ config MTD_NAND_AMS_DELTA
Support for NAND flash on Amstrad E3 (Delta).
config MTD_NAND_OMAP2
- tristate "NAND Flash device on OMAP 2420H4/2430SDP boards"
- depends on (ARM && ARCH_OMAP2 && MTD_NAND)
+ tristate "NAND Flash device on OMAP2 and OMAP3"
+ depends on ARM && MTD_NAND && (ARCH_OMAP2 || ARCH_OMAP3)
help
- Support for NAND flash on Texas Instruments 2430SDP/2420H4 platforms.
+ Support for NAND flash on Texas Instruments OMAP2 and OMAP3 platforms.
config MTD_NAND_OMAP
tristate "NAND Flash device on OMAP H3/H2/P2 boards"
Index: linux-beagle/drivers/mtd/nand/omap2.c
===================================================================
--- linux-beagle.orig/drivers/mtd/nand/omap2.c
+++ linux-beagle/drivers/mtd/nand/omap2.c
@@ -111,15 +111,6 @@
static const char *part_probes[] = { "cmdlinepart", NULL };
#endif
-static int hw_ecc = 1;
-
-/* new oob placement block for use with hardware ecc generation */
-static struct nand_ecclayout omap_hw_eccoob = {
- .eccbytes = 12,
- .eccpos = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
- .oobfree = {{16, 32}, {33, 63} },
-};
-
struct omap_nand_info {
struct nand_hw_control controller;
struct omap_nand_platform_data *pdata;
@@ -133,6 +124,13 @@ struct omap_nand_info {
void __iomem *gpmc_cs_baseaddr;
void __iomem *gpmc_baseaddr;
};
+
+/*
+ * omap_nand_wp - This function enable or disable the Write Protect feature on
+ * NAND device
+ * @mtd: MTD device structure
+ * @mode: WP ON/OFF
+ */
static void omap_nand_wp(struct mtd_info *mtd, int mode)
{
struct omap_nand_info *info = container_of(mtd,
@@ -189,11 +187,11 @@ static void omap_hwcontrol(struct mtd_in
}
/*
-* omap_read_buf - read data from NAND controller into buffer
-* @mtd: MTD device structure
-* @buf: buffer to store date
-* @len: number of bytes to read
-*/
+ * omap_read_buf - read data from NAND controller into buffer
+ * @mtd: MTD device structure
+ * @buf: buffer to store date
+ * @len: number of bytes to read
+ */
static void omap_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
struct omap_nand_info *info = container_of(mtd,
@@ -207,11 +205,11 @@ static void omap_read_buf(struct mtd_inf
}
/*
-* omap_write_buf - write buffer to NAND controller
-* @mtd: MTD device structure
-* @buf: data buffer
-* @len: number of bytes to write
-*/
+ * omap_write_buf - write buffer to NAND controller
+ * @mtd: MTD device structure
+ * @buf: data buffer
+ * @len: number of bytes to write
+ */
static void omap_write_buf(struct mtd_info *mtd, const u_char * buf, int len)
{
struct omap_nand_info *info = container_of(mtd,
@@ -250,10 +248,16 @@ static int omap_verify_buf(struct mtd_in
return 0;
}
+#ifdef CONFIG_MTD_NAND_OMAP_HWECC
+/*
+ * omap_hwecc_init-Initialize the Hardware ECC for NAND flash in GPMC controller
+ * @mtd: MTD device structure
+ */
static void omap_hwecc_init(struct mtd_info *mtd)
{
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
+ register struct nand_chip *chip = mtd->priv;
unsigned long val = 0x0;
/* Read from ECC Control Register */
@@ -264,16 +268,15 @@ static void omap_hwecc_init(struct mtd_i
/* Read from ECC Size Config Register */
val = __raw_readl(info->gpmc_baseaddr + GPMC_ECC_SIZE_CONFIG);
- /* ECCSIZE1=512 | ECCSIZE0=8bytes | Select eccResultsize[0123] */
- val = ((0x000000FF<<22) | (0x00000003<<12) | (0x0000000F));
+ /* ECCSIZE1=512 | Select eccResultsize[0-3] */
+ val = ((((chip->ecc.size >> 1) - 1) << 22) | (0x0000000F));
__raw_writel(val, info->gpmc_baseaddr + GPMC_ECC_SIZE_CONFIG);
-
-
}
/*
- * This function will generate true ECC value, which can be used
+ * gen_true_ecc - This function will generate true ECC value, which can be used
* when correcting data read from NAND flash memory core
+ * @ecc_buf: buffer to store ecc code
*/
static void gen_true_ecc(u8 *ecc_buf)
{
@@ -289,8 +292,12 @@ static void gen_true_ecc(u8 *ecc_buf)
}
/*
- * This function compares two ECC's and indicates if there is an error.
- * If the error can be corrected it will be corrected to the buffer
+ * omap_compare_ecc - This function compares two ECC's and indicates if there
+ * is an error. If the error can be corrected it will be corrected to the
+ * buffer
+ * @ecc_data1: ecc code from nand spare area
+ * @ecc_data2: ecc code from hardware register obtained from hardware ecc
+ * @page_data: page data
*/
static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */
u8 *ecc_data2, /* read from register */
@@ -409,6 +416,14 @@ static int omap_compare_ecc(u8 *ecc_data
}
}
+/*
+ * omap_correct_data - Compares the ecc read from nand spare area with ECC
+ * registers values and corrects one bit error if it has occured
+ * @mtd: MTD device structure
+ * @dat: page data
+ * @read_ecc: ecc read from nand flash
+ * @calc_ecc: ecc read from ECC registers
+ */
static int omap_correct_data(struct mtd_info *mtd, u_char * dat,
u_char * read_ecc, u_char * calc_ecc)
{
@@ -436,65 +451,64 @@ static int omap_correct_data(struct mtd_
}
/*
-** Generate non-inverted ECC bytes.
-**
-** Using noninverted ECC can be considered ugly since writing a blank
-** page ie. padding will clear the ECC bytes. This is no problem as long
-** nobody 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.
-*/
+ * omap_calcuate_ecc - Generate non-inverted ECC bytes.
+ * Using noninverted ECC can be considered ugly since writing a blank
+ * page ie. padding will clear the ECC bytes. This is no problem as long
+ * nobody 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.
+ * @mtd: MTD device structure
+ * @dat: The pointer to data on which ecc is computed
+ * @ecc_code: The ecc_code buffer
+ */
static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
u_char *ecc_code)
{
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
unsigned long val = 0x0;
- unsigned long reg, n;
-
- /* Ex NAND_ECC_HW12_2048 */
- if ((info->nand.ecc.mode == NAND_ECC_HW) &&
- (info->nand.ecc.size == 2048))
- n = 4;
- else
- n = 1;
+ unsigned long reg;
/* Start Reading from HW ECC1_Result = 0x200 */
reg = (unsigned long)(info->gpmc_baseaddr + GPMC_ECC1_RESULT);
- while (n--) {
- val = __raw_readl(reg);
- *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);
- reg += 4;
- }
+ val = __raw_readl(reg);
+ *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);
+ reg += 4;
return 0;
-} /* omap_calculate_ecc */
+}
+/*
+ * omap_enable_hwecc - This function enables the hardware ecc functionality
+ * @mtd: MTD device structure
+ * @mode: Read/Write mode
+ */
static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
{
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
+ register struct nand_chip *chip = mtd->priv;
+ unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
unsigned long val = __raw_readl(info->gpmc_baseaddr + GPMC_ECC_CONFIG);
switch (mode) {
case NAND_ECC_READ :
__raw_writel(0x101, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
- /* ECC 16 bit col) | ( CS 0 ) | ECC Enable */
- val = (1 << 7) | (0x0) | (0x1) ;
+ /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
+ val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
break;
case NAND_ECC_READSYN :
- __raw_writel(0x100, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
- /* ECC 16 bit col) | ( CS 0 ) | ECC Enable */
- val = (1 << 7) | (0x0) | (0x1) ;
+ __raw_writel(0x100, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
+ /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
+ val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
break;
case NAND_ECC_WRITE :
__raw_writel(0x101, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
- /* ECC 16 bit col) | ( CS 0 ) | ECC Enable */
- val = (1 << 7) | (0x0) | (0x1) ;
+ /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
+ val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
break;
default:
DEBUG(MTD_DEBUG_LEVEL0, "Error: Unrecognized Mode[%d]!\n",
@@ -504,7 +518,38 @@ static void omap_enable_hwecc(struct mtd
__raw_writel(val, info->gpmc_baseaddr + GPMC_ECC_CONFIG);
}
+#endif
+
+/*
+ * omap_wait - Wait function is called during Program and erase
+ * operations and the way it is called from MTD layer, we should wait
+ * till the NAND chip is ready after the programming/erase operation
+ * has completed.
+ * @mtd: MTD device structure
+ * @chip: NAND Chip structure
+ */
+static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
+{
+ register struct nand_chip *this = mtd->priv;
+ struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
+ mtd);
+ int status = 0;
+
+ this->IO_ADDR_W = (void *) info->gpmc_cs_baseaddr +
+ GPMC_CS_NAND_COMMAND;
+ this->IO_ADDR_R = (void *) info->gpmc_cs_baseaddr + GPMC_CS_NAND_DATA;
+
+ while (!(status & 0x40)) {
+ __raw_writeb(NAND_CMD_STATUS & 0xFF, this->IO_ADDR_W);
+ status = __raw_readb(this->IO_ADDR_R);
+ }
+ return status;
+}
+/*
+ * omap_dev_ready - calls the platform specific dev_ready function
+ * @mtd: MTD device structure
+ */
static int omap_dev_ready(struct mtd_info *mtd)
{
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
@@ -534,7 +579,7 @@ static int __devinit omap_nand_probe(str
struct omap_nand_info *info;
struct omap_nand_platform_data *pdata;
int err;
- unsigned long val;
+ unsigned long val;
pdata = pdev->dev.platform_data;
@@ -568,15 +613,20 @@ static int __devinit omap_nand_probe(str
}
/* Enable RD PIN Monitoring Reg */
- val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
- val |= WR_RD_PIN_MONITORING;
- gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
+ if (pdata->dev_ready) {
+ val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
+ val |= WR_RD_PIN_MONITORING;
+ gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
+ }
val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG7);
val &= ~(0xf << 8);
val |= (0xc & 0xf) << 8;
gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG7, val);
+ /* NAND write protect off */
+ omap_nand_wp(&info->mtd, NAND_WP_OFF);
+
if (!request_mem_region(info->phys_base, NAND_IO_SIZE,
pdev->dev.driver->name)) {
err = -EBUSY;
@@ -597,29 +647,39 @@ static int __devinit omap_nand_probe(str
info->nand.write_buf = omap_write_buf;
info->nand.verify_buf = omap_verify_buf;
- info->nand.dev_ready = omap_dev_ready;
- info->nand.chip_delay = 0;
-
- /* Options */
- info->nand.options = NAND_BUSWIDTH_16;
- info->nand.options |= NAND_SKIP_BBTSCAN;
-
- if (hw_ecc) {
- /* init HW ECC */
- omap_hwecc_init(&info->mtd);
-
- info->nand.ecc.calculate = omap_calculate_ecc;
- info->nand.ecc.hwctl = omap_enable_hwecc;
- info->nand.ecc.correct = omap_correct_data;
- info->nand.ecc.mode = NAND_ECC_HW;
- info->nand.ecc.bytes = 12;
- info->nand.ecc.size = 2048;
- info->nand.ecc.layout = &omap_hw_eccoob;
-
+ /*
+ * If RDY/BSY line is connected to OMAP then use the omap ready funcrtion
+ * and the generic nand_wait function which reads the status register
+ * after monitoring the RDY/BSY line.Otherwise use a standard chip delay
+ * which is slightly more than tR (AC Timing) of the NAND device and read
+ * status register until you get a failure or success
+ */
+ if (pdata->dev_ready) {
+ info->nand.dev_ready = omap_dev_ready;
+ info->nand.chip_delay = 0;
} else {
- info->nand.ecc.mode = NAND_ECC_SOFT;
+ info->nand.waitfunc = omap_wait;
+ info->nand.chip_delay = 50;
}
+ info->nand.options |= NAND_SKIP_BBTSCAN;
+ if ((gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1) & 0x3000)
+ == 0x1000)
+ info->nand.options |= NAND_BUSWIDTH_16;
+
+#ifdef CONFIG_MTD_NAND_OMAP_HWECC
+ info->nand.ecc.bytes = 3;
+ info->nand.ecc.size = 512;
+ info->nand.ecc.calculate = omap_calculate_ecc;
+ info->nand.ecc.hwctl = omap_enable_hwecc;
+ info->nand.ecc.correct = omap_correct_data;
+ info->nand.ecc.mode = NAND_ECC_HW;
+
+ /* init HW ECC */
+ omap_hwecc_init(&info->mtd);
+#else
+ info->nand.ecc.mode = NAND_ECC_SOFT;
+#endif
/* DIP switches on some boards change between 8 and 16 bit
* bus widths for flash. Try the other width if the first try fails.
@@ -642,8 +702,6 @@ static int __devinit omap_nand_probe(str
#endif
add_mtd_device(&info->mtd);
- omap_nand_wp(&info->mtd, NAND_WP_OFF);
-
platform_set_drvdata(pdev, &info->mtd);
return 0;
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH 1/3 v2] mtd omap2 nand driver: extend to work with omap3 boards
2008-08-04 15:58 [PATCH 1/3 v2] mtd omap2 nand driver: extend to work with omap3 boards Dirk Behme
@ 2008-08-04 16:27 ` Koen Kooi
0 siblings, 0 replies; 2+ messages in thread
From: Koen Kooi @ 2008-08-04 16:27 UTC (permalink / raw)
To: Dirk Behme; +Cc: linux-omap@vger.kernel.org, Steve Sakoman
[-- Attachment #1: Type: text/plain, Size: 14419 bytes --]
Acked-by: Koen Kooi <koen at openembedded dot org>
Op 4 aug 2008, om 17:58 heeft Dirk Behme het volgende geschreven:
> From: Teerth Reddy <teerth@ti.com>, Steve Sakoman
> <steve@sakoman.com>, Dirk Behme <dirk.behme@gmail.com>
>
> Extend omap2 mtd nand driver to work with ARCH_OMAP3 boards
>
> Signed-off-by: Steve Sakoman <steve@sakoman.com>
> Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
>
> Index: linux-beagle/drivers/mtd/nand/Kconfig
> ===================================================================
> --- linux-beagle.orig/drivers/mtd/nand/Kconfig
> +++ linux-beagle/drivers/mtd/nand/Kconfig
> @@ -70,10 +70,10 @@ config MTD_NAND_AMS_DELTA
> Support for NAND flash on Amstrad E3 (Delta).
>
> config MTD_NAND_OMAP2
> - tristate "NAND Flash device on OMAP 2420H4/2430SDP boards"
> - depends on (ARM && ARCH_OMAP2 && MTD_NAND)
> + tristate "NAND Flash device on OMAP2 and OMAP3"
> + depends on ARM && MTD_NAND && (ARCH_OMAP2 || ARCH_OMAP3)
> help
> - Support for NAND flash on Texas Instruments 2430SDP/
> 2420H4 platforms.
> + Support for NAND flash on Texas Instruments OMAP2 and
> OMAP3 platforms.
>
> config MTD_NAND_OMAP
> tristate "NAND Flash device on OMAP H3/H2/P2 boards"
> Index: linux-beagle/drivers/mtd/nand/omap2.c
> ===================================================================
> --- linux-beagle.orig/drivers/mtd/nand/omap2.c
> +++ linux-beagle/drivers/mtd/nand/omap2.c
> @@ -111,15 +111,6 @@
> static const char *part_probes[] = { "cmdlinepart", NULL };
> #endif
>
> -static int hw_ecc = 1;
> -
> -/* new oob placement block for use with hardware ecc generation */
> -static struct nand_ecclayout omap_hw_eccoob = {
> - .eccbytes = 12,
> - .eccpos = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
> - .oobfree = {{16, 32}, {33, 63} },
> -};
> -
> struct omap_nand_info {
> struct nand_hw_control controller;
> struct omap_nand_platform_data *pdata;
> @@ -133,6 +124,13 @@ struct omap_nand_info {
> void __iomem *gpmc_cs_baseaddr;
> void __iomem *gpmc_baseaddr;
> };
> +
> +/*
> + * omap_nand_wp - This function enable or disable the Write Protect
> feature on
> + * NAND device
> + * @mtd: MTD device structure
> + * @mode: WP ON/OFF
> + */
> static void omap_nand_wp(struct mtd_info *mtd, int mode)
> {
> struct omap_nand_info *info = container_of(mtd,
> @@ -189,11 +187,11 @@ static void omap_hwcontrol(struct mtd_in
> }
>
> /*
> -* omap_read_buf - read data from NAND controller into buffer
> -* @mtd: MTD device structure
> -* @buf: buffer to store date
> -* @len: number of bytes to read
> -*/
> + * omap_read_buf - read data from NAND controller into buffer
> + * @mtd: MTD device structure
> + * @buf: buffer to store date
> + * @len: number of bytes to read
> + */
> static void omap_read_buf(struct mtd_info *mtd, u_char *buf, int len)
> {
> struct omap_nand_info *info = container_of(mtd,
> @@ -207,11 +205,11 @@ static void omap_read_buf(struct mtd_inf
> }
>
> /*
> -* omap_write_buf - write buffer to NAND controller
> -* @mtd: MTD device structure
> -* @buf: data buffer
> -* @len: number of bytes to write
> -*/
> + * omap_write_buf - write buffer to NAND controller
> + * @mtd: MTD device structure
> + * @buf: data buffer
> + * @len: number of bytes to write
> + */
> static void omap_write_buf(struct mtd_info *mtd, const u_char * buf,
> int len)
> {
> struct omap_nand_info *info = container_of(mtd,
> @@ -250,10 +248,16 @@ static int omap_verify_buf(struct mtd_in
> return 0;
> }
>
> +#ifdef CONFIG_MTD_NAND_OMAP_HWECC
> +/*
> + * omap_hwecc_init-Initialize the Hardware ECC for NAND flash in
> GPMC controller
> + * @mtd: MTD device structure
> + */
> static void omap_hwecc_init(struct mtd_info *mtd)
> {
> struct omap_nand_info *info = container_of(mtd, struct
> omap_nand_info,
> mtd);
> + register struct nand_chip *chip = mtd->priv;
> unsigned long val = 0x0;
>
> /* Read from ECC Control Register */
> @@ -264,16 +268,15 @@ static void omap_hwecc_init(struct mtd_i
>
> /* Read from ECC Size Config Register */
> val = __raw_readl(info->gpmc_baseaddr + GPMC_ECC_SIZE_CONFIG);
> - /* ECCSIZE1=512 | ECCSIZE0=8bytes | Select eccResultsize[0123] */
> - val = ((0x000000FF<<22) | (0x00000003<<12) | (0x0000000F));
> + /* ECCSIZE1=512 | Select eccResultsize[0-3] */
> + val = ((((chip->ecc.size >> 1) - 1) << 22) | (0x0000000F));
> __raw_writel(val, info->gpmc_baseaddr + GPMC_ECC_SIZE_CONFIG);
> -
> -
> }
>
> /*
> - * This function will generate true ECC value, which can be used
> + * gen_true_ecc - This function will generate true ECC value, which
> can be used
> * when correcting data read from NAND flash memory core
> + * @ecc_buf: buffer to store ecc code
> */
> static void gen_true_ecc(u8 *ecc_buf)
> {
> @@ -289,8 +292,12 @@ static void gen_true_ecc(u8 *ecc_buf)
> }
>
> /*
> - * This function compares two ECC's and indicates if there is an
> error.
> - * If the error can be corrected it will be corrected to the buffer
> + * omap_compare_ecc - This function compares two ECC's and
> indicates if there
> + * is an error. If the error can be corrected it will be corrected
> to the
> + * buffer
> + * @ecc_data1: ecc code from nand spare area
> + * @ecc_data2: ecc code from hardware register obtained from
> hardware ecc
> + * @page_data: page data
> */
> static int omap_compare_ecc(u8 *ecc_data1, /* read from NAND memory */
> u8 *ecc_data2, /* read from register */
> @@ -409,6 +416,14 @@ static int omap_compare_ecc(u8 *ecc_data
> }
> }
>
> +/*
> + * omap_correct_data - Compares the ecc read from nand spare area
> with ECC
> + * registers values and corrects one bit error if it has occured
> + * @mtd: MTD device structure
> + * @dat: page data
> + * @read_ecc: ecc read from nand flash
> + * @calc_ecc: ecc read from ECC registers
> + */
> static int omap_correct_data(struct mtd_info *mtd, u_char * dat,
> u_char * read_ecc, u_char * calc_ecc)
> {
> @@ -436,65 +451,64 @@ static int omap_correct_data(struct mtd_
> }
>
> /*
> -** Generate non-inverted ECC bytes.
> -**
> -** Using noninverted ECC can be considered ugly since writing a blank
> -** page ie. padding will clear the ECC bytes. This is no problem as
> long
> -** nobody 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.
> -*/
> + * omap_calcuate_ecc - Generate non-inverted ECC bytes.
> + * Using noninverted ECC can be considered ugly since writing a blank
> + * page ie. padding will clear the ECC bytes. This is no problem as
> long
> + * nobody 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.
> + * @mtd: MTD device structure
> + * @dat: The pointer to data on which ecc is computed
> + * @ecc_code: The ecc_code buffer
> + */
> static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
> u_char *ecc_code)
> {
> struct omap_nand_info *info = container_of(mtd, struct
> omap_nand_info,
> mtd);
> unsigned long val = 0x0;
> - unsigned long reg, n;
> -
> - /* Ex NAND_ECC_HW12_2048 */
> - if ((info->nand.ecc.mode == NAND_ECC_HW) &&
> - (info->nand.ecc.size == 2048))
> - n = 4;
> - else
> - n = 1;
> + unsigned long reg;
>
> /* Start Reading from HW ECC1_Result = 0x200 */
> reg = (unsigned long)(info->gpmc_baseaddr + GPMC_ECC1_RESULT);
> - while (n--) {
> - val = __raw_readl(reg);
> - *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);
> - reg += 4;
> - }
> + val = __raw_readl(reg);
> + *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);
> + reg += 4;
>
> return 0;
> -} /* omap_calculate_ecc */
> +}
>
> +/*
> + * omap_enable_hwecc - This function enables the hardware ecc
> functionality
> + * @mtd: MTD device structure
> + * @mode: Read/Write mode
> + */
> static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
> {
> struct omap_nand_info *info = container_of(mtd, struct
> omap_nand_info,
> mtd);
> + register struct nand_chip *chip = mtd->priv;
> + unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
> unsigned long val = __raw_readl(info->gpmc_baseaddr +
> GPMC_ECC_CONFIG);
>
> switch (mode) {
> case NAND_ECC_READ :
> __raw_writel(0x101, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
> - /* ECC 16 bit col) | ( CS 0 ) | ECC Enable */
> - val = (1 << 7) | (0x0) | (0x1) ;
> + /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
> + val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
> break;
> case NAND_ECC_READSYN :
> - __raw_writel(0x100, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
> - /* ECC 16 bit col) | ( CS 0 ) | ECC Enable */
> - val = (1 << 7) | (0x0) | (0x1) ;
> + __raw_writel(0x100, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
> + /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
> + val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
> break;
> case NAND_ECC_WRITE :
> __raw_writel(0x101, info->gpmc_baseaddr + GPMC_ECC_CONTROL);
> - /* ECC 16 bit col) | ( CS 0 ) | ECC Enable */
> - val = (1 << 7) | (0x0) | (0x1) ;
> + /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
> + val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
> break;
> default:
> DEBUG(MTD_DEBUG_LEVEL0, "Error: Unrecognized Mode[%d]!\n",
> @@ -504,7 +518,38 @@ static void omap_enable_hwecc(struct mtd
>
> __raw_writel(val, info->gpmc_baseaddr + GPMC_ECC_CONFIG);
> }
> +#endif
> +
> +/*
> + * omap_wait - Wait function is called during Program and erase
> + * operations and the way it is called from MTD layer, we should wait
> + * till the NAND chip is ready after the programming/erase operation
> + * has completed.
> + * @mtd: MTD device structure
> + * @chip: NAND Chip structure
> + */
> +static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
> +{
> + register struct nand_chip *this = mtd->priv;
> + struct omap_nand_info *info = container_of(mtd, struct
> omap_nand_info,
> + mtd);
> + int status = 0;
> +
> + this->IO_ADDR_W = (void *) info->gpmc_cs_baseaddr +
> + GPMC_CS_NAND_COMMAND;
> + this->IO_ADDR_R = (void *) info->gpmc_cs_baseaddr +
> GPMC_CS_NAND_DATA;
> +
> + while (!(status & 0x40)) {
> + __raw_writeb(NAND_CMD_STATUS & 0xFF, this->IO_ADDR_W);
> + status = __raw_readb(this->IO_ADDR_R);
> + }
> + return status;
> +}
>
> +/*
> + * omap_dev_ready - calls the platform specific dev_ready function
> + * @mtd: MTD device structure
> + */
> static int omap_dev_ready(struct mtd_info *mtd)
> {
> struct omap_nand_info *info = container_of(mtd, struct
> omap_nand_info,
> @@ -534,7 +579,7 @@ static int __devinit omap_nand_probe(str
> struct omap_nand_info *info;
> struct omap_nand_platform_data *pdata;
> int err;
> - unsigned long val;
> + unsigned long val;
>
>
> pdata = pdev->dev.platform_data;
> @@ -568,15 +613,20 @@ static int __devinit omap_nand_probe(str
> }
>
> /* Enable RD PIN Monitoring Reg */
> - val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
> - val |= WR_RD_PIN_MONITORING;
> - gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
> + if (pdata->dev_ready) {
> + val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1);
> + val |= WR_RD_PIN_MONITORING;
> + gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG1, val);
> + }
>
> val = gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG7);
> val &= ~(0xf << 8);
> val |= (0xc & 0xf) << 8;
> gpmc_cs_write_reg(info->gpmc_cs, GPMC_CS_CONFIG7, val);
>
> + /* NAND write protect off */
> + omap_nand_wp(&info->mtd, NAND_WP_OFF);
> +
> if (!request_mem_region(info->phys_base, NAND_IO_SIZE,
> pdev->dev.driver->name)) {
> err = -EBUSY;
> @@ -597,29 +647,39 @@ static int __devinit omap_nand_probe(str
> info->nand.write_buf = omap_write_buf;
> info->nand.verify_buf = omap_verify_buf;
>
> - info->nand.dev_ready = omap_dev_ready;
> - info->nand.chip_delay = 0;
> -
> - /* Options */
> - info->nand.options = NAND_BUSWIDTH_16;
> - info->nand.options |= NAND_SKIP_BBTSCAN;
> -
> - if (hw_ecc) {
> - /* init HW ECC */
> - omap_hwecc_init(&info->mtd);
> -
> - info->nand.ecc.calculate = omap_calculate_ecc;
> - info->nand.ecc.hwctl = omap_enable_hwecc;
> - info->nand.ecc.correct = omap_correct_data;
> - info->nand.ecc.mode = NAND_ECC_HW;
> - info->nand.ecc.bytes = 12;
> - info->nand.ecc.size = 2048;
> - info->nand.ecc.layout = &omap_hw_eccoob;
> -
> + /*
> + * If RDY/BSY line is connected to OMAP then use the omap ready
> funcrtion
> + * and the generic nand_wait function which reads the status register
> + * after monitoring the RDY/BSY line.Otherwise use a standard chip
> delay
> + * which is slightly more than tR (AC Timing) of the NAND device
> and read
> + * status register until you get a failure or success
> + */
> + if (pdata->dev_ready) {
> + info->nand.dev_ready = omap_dev_ready;
> + info->nand.chip_delay = 0;
> } else {
> - info->nand.ecc.mode = NAND_ECC_SOFT;
> + info->nand.waitfunc = omap_wait;
> + info->nand.chip_delay = 50;
> }
>
> + info->nand.options |= NAND_SKIP_BBTSCAN;
> + if ((gpmc_cs_read_reg(info->gpmc_cs, GPMC_CS_CONFIG1) & 0x3000)
> + == 0x1000)
> + info->nand.options |= NAND_BUSWIDTH_16;
> +
> +#ifdef CONFIG_MTD_NAND_OMAP_HWECC
> + info->nand.ecc.bytes = 3;
> + info->nand.ecc.size = 512;
> + info->nand.ecc.calculate = omap_calculate_ecc;
> + info->nand.ecc.hwctl = omap_enable_hwecc;
> + info->nand.ecc.correct = omap_correct_data;
> + info->nand.ecc.mode = NAND_ECC_HW;
> +
> + /* init HW ECC */
> + omap_hwecc_init(&info->mtd);
> +#else
> + info->nand.ecc.mode = NAND_ECC_SOFT;
> +#endif
>
> /* DIP switches on some boards change between 8 and 16 bit
> * bus widths for flash. Try the other width if the first try fails.
> @@ -642,8 +702,6 @@ static int __devinit omap_nand_probe(str
> #endif
> add_mtd_device(&info->mtd);
>
> - omap_nand_wp(&info->mtd, NAND_WP_OFF);
> -
> platform_set_drvdata(pdev, &info->mtd);
>
> return 0;
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2008-08-04 15:58 [PATCH 1/3 v2] mtd omap2 nand driver: extend to work with omap3 boards Dirk Behme
2008-08-04 16:27 ` Koen Kooi
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