mtd: pxa3xx_nand: enable multiple chip select support
Current pxa3xx_nand controller has two chip select which
both be workable. This patch enable this feature.
Update platform driver to support this feature.
Another notice should be taken that:
When you want to use this feature, you should not enable the
keep configuration feature, for two chip select could be
attached with different nand chip. The different page size
and timing requirement make the keep configuration impossible.
Signed-off-by: Lei Wen <leiwen@marvell.com>
diff --git a/arch/arm/mach-mmp/aspenite.c b/arch/arm/mach-mmp/aspenite.c
index 06b5fa8..c4996f3 100644
--- a/arch/arm/mach-mmp/aspenite.c
+++ b/arch/arm/mach-mmp/aspenite.c
@@ -167,8 +167,9 @@
static struct pxa3xx_nand_platform_data aspenite_nand_info = {
.enable_arbiter = 1,
- .parts = aspenite_nand_partitions,
- .nr_parts = ARRAY_SIZE(aspenite_nand_partitions),
+ .num_cs = 1,
+ .parts[0] = aspenite_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(aspenite_nand_partitions),
};
static struct i2c_board_info aspenite_i2c_info[] __initdata = {
diff --git a/arch/arm/mach-pxa/cm-x300.c b/arch/arm/mach-pxa/cm-x300.c
index b6a5134..eac3846 100644
--- a/arch/arm/mach-pxa/cm-x300.c
+++ b/arch/arm/mach-pxa/cm-x300.c
@@ -424,8 +424,9 @@
static struct pxa3xx_nand_platform_data cm_x300_nand_info = {
.enable_arbiter = 1,
.keep_config = 1,
- .parts = cm_x300_nand_partitions,
- .nr_parts = ARRAY_SIZE(cm_x300_nand_partitions),
+ .num_cs = 1,
+ .parts[0] = cm_x300_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(cm_x300_nand_partitions),
};
static void __init cm_x300_init_nand(void)
diff --git a/arch/arm/mach-pxa/colibri-pxa3xx.c b/arch/arm/mach-pxa/colibri-pxa3xx.c
index 3f9be41..2b8ca0d 100644
--- a/arch/arm/mach-pxa/colibri-pxa3xx.c
+++ b/arch/arm/mach-pxa/colibri-pxa3xx.c
@@ -139,8 +139,9 @@
static struct pxa3xx_nand_platform_data colibri_nand_info = {
.enable_arbiter = 1,
.keep_config = 1,
- .parts = colibri_nand_partitions,
- .nr_parts = ARRAY_SIZE(colibri_nand_partitions),
+ .num_cs = 1,
+ .parts[0] = colibri_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(colibri_nand_partitions),
};
void __init colibri_pxa3xx_init_nand(void)
diff --git a/arch/arm/mach-pxa/littleton.c b/arch/arm/mach-pxa/littleton.c
index 8f97e15..cd9fda3 100644
--- a/arch/arm/mach-pxa/littleton.c
+++ b/arch/arm/mach-pxa/littleton.c
@@ -325,8 +325,9 @@
static struct pxa3xx_nand_platform_data littleton_nand_info = {
.enable_arbiter = 1,
- .parts = littleton_nand_partitions,
- .nr_parts = ARRAY_SIZE(littleton_nand_partitions),
+ .num_cs = 1,
+ .parts[0] = littleton_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(littleton_nand_partitions),
};
static void __init littleton_init_nand(void)
diff --git a/arch/arm/mach-pxa/mxm8x10.c b/arch/arm/mach-pxa/mxm8x10.c
index b5a8fd3..90928d6 100644
--- a/arch/arm/mach-pxa/mxm8x10.c
+++ b/arch/arm/mach-pxa/mxm8x10.c
@@ -389,10 +389,11 @@
};
static struct pxa3xx_nand_platform_data mxm_8x10_nand_info = {
- .enable_arbiter = 1,
- .keep_config = 1,
- .parts = mxm_8x10_nand_partitions,
- .nr_parts = ARRAY_SIZE(mxm_8x10_nand_partitions)
+ .enable_arbiter = 1,
+ .keep_config = 1,
+ .num_cs = 1,
+ .parts[0] = mxm_8x10_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(mxm_8x10_nand_partitions)
};
static void __init mxm_8x10_nand_init(void)
diff --git a/arch/arm/mach-pxa/raumfeld.c b/arch/arm/mach-pxa/raumfeld.c
index bbcd905..6a2f353 100644
--- a/arch/arm/mach-pxa/raumfeld.c
+++ b/arch/arm/mach-pxa/raumfeld.c
@@ -346,8 +346,9 @@
static struct pxa3xx_nand_platform_data raumfeld_nand_info = {
.enable_arbiter = 1,
.keep_config = 1,
- .parts = raumfeld_nand_partitions,
- .nr_parts = ARRAY_SIZE(raumfeld_nand_partitions),
+ .num_cs = 1,
+ .parts[0] = raumfeld_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(raumfeld_nand_partitions),
};
/**
diff --git a/arch/arm/mach-pxa/zylonite.c b/arch/arm/mach-pxa/zylonite.c
index 15ec66b..90fbf87 100644
--- a/arch/arm/mach-pxa/zylonite.c
+++ b/arch/arm/mach-pxa/zylonite.c
@@ -366,8 +366,9 @@
static struct pxa3xx_nand_platform_data zylonite_nand_info = {
.enable_arbiter = 1,
- .parts = zylonite_nand_partitions,
- .nr_parts = ARRAY_SIZE(zylonite_nand_partitions),
+ .num_cs = 1,
+ .parts[0] = zylonite_nand_partitions,
+ .nr_parts[0] = ARRAY_SIZE(zylonite_nand_partitions),
};
static void __init zylonite_init_nand(void)
diff --git a/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h b/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h
index 442301f..c42f39f 100644
--- a/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h
+++ b/arch/arm/plat-pxa/include/plat/pxa3xx_nand.h
@@ -41,6 +41,19 @@
struct pxa3xx_nand_timing *timing; /* NAND Flash timing */
};
+/*
+ * Current pxa3xx_nand controller has two chip select which
+ * both be workable.
+ *
+ * Notice should be taken that:
+ * When you want to use this feature, you should not enable the
+ * keep configuration feature, for two chip select could be
+ * attached with different nand chip. The different page size
+ * and timing requirement make the keep configuration impossible.
+ */
+
+/* The max num of chip select current support */
+#define NUM_CHIP_SELECT (2)
struct pxa3xx_nand_platform_data {
/* the data flash bus is shared between the Static Memory
@@ -52,8 +65,11 @@
/* allow platform code to keep OBM/bootloader defined NFC config */
int keep_config;
- const struct mtd_partition *parts;
- unsigned int nr_parts;
+ /* indicate how many chip selects will be used */
+ int num_cs;
+
+ const struct mtd_partition *parts[NUM_CHIP_SELECT];
+ unsigned int nr_parts[NUM_CHIP_SELECT];
const struct pxa3xx_nand_flash * flash;
size_t num_flash;
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 97b6894..9eb7f87 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -130,6 +130,7 @@
/* page size of attached chip */
unsigned int page_size;
int use_ecc;
+ int cs;
/* calculated from pxa3xx_nand_flash data */
unsigned int col_addr_cycles;
@@ -165,9 +166,10 @@
struct pxa_dma_desc *data_desc;
dma_addr_t data_desc_addr;
- struct pxa3xx_nand_host *host;
+ struct pxa3xx_nand_host *host[NUM_CHIP_SELECT];
unsigned int state;
+ int cs;
int use_ecc; /* use HW ECC ? */
int use_dma; /* use DMA ? */
int is_ready;
@@ -226,7 +228,7 @@
/* Define a default flash type setting serve as flash detecting only */
#define DEFAULT_FLASH_TYPE (&builtin_flash_types[0])
-const char *mtd_names[] = {"pxa3xx_nand-0", NULL};
+const char *mtd_names[] = {"pxa3xx_nand-0", "pxa3xx_nand-1", NULL};
#define NDTR0_tCH(c) (min((c), 7) << 19)
#define NDTR0_tCS(c) (min((c), 7) << 16)
@@ -268,7 +270,7 @@
static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info)
{
- struct pxa3xx_nand_host *host = info->host;
+ struct pxa3xx_nand_host *host = info->host[info->cs];
int oob_enable = host->reg_ndcr & NDCR_SPARE_EN;
info->data_size = host->page_size;
@@ -295,7 +297,7 @@
*/
static void pxa3xx_nand_start(struct pxa3xx_nand_info *info)
{
- struct pxa3xx_nand_host *host = info->host;
+ struct pxa3xx_nand_host *host = info->host[info->cs];
uint32_t ndcr;
ndcr = host->reg_ndcr;
@@ -420,6 +422,15 @@
{
struct pxa3xx_nand_info *info = devid;
unsigned int status, is_completed = 0;
+ unsigned int ready, cmd_done;
+
+ if (info->cs == 0) {
+ ready = NDSR_FLASH_RDY;
+ cmd_done = NDSR_CS0_CMDD;
+ } else {
+ ready = NDSR_RDY;
+ cmd_done = NDSR_CS1_CMDD;
+ }
status = nand_readl(info, NDSR);
@@ -441,11 +452,11 @@
handle_data_pio(info);
}
}
- if (status & NDSR_CS0_CMDD) {
+ if (status & cmd_done) {
info->state = STATE_CMD_DONE;
is_completed = 1;
}
- if (status & NDSR_FLASH_RDY) {
+ if (status & ready) {
info->is_ready = 1;
info->state = STATE_READY;
}
@@ -480,9 +491,11 @@
{
uint16_t cmd;
int addr_cycle, exec_cmd;
- struct pxa3xx_nand_host *host = info->host;
- struct mtd_info *mtd = host->mtd;
+ struct pxa3xx_nand_host *host;
+ struct mtd_info *mtd;
+ host = info->host[info->cs];
+ mtd = host->mtd;
addr_cycle = 0;
exec_cmd = 1;
@@ -492,8 +505,11 @@
info->oob_size = 0;
info->use_ecc = 0;
info->is_ready = 0;
- info->ndcb0 = 0;
info->retcode = ERR_NONE;
+ if (info->cs != 0)
+ info->ndcb0 = NDCB0_CSEL;
+ else
+ info->ndcb0 = 0;
switch (command) {
case NAND_CMD_READ0:
@@ -637,6 +653,17 @@
if (host->reg_ndcr & NDCR_DWIDTH_M)
column /= 2;
+ /*
+ * There may be different NAND chip hooked to
+ * different chip select, so check whether
+ * chip select has been changed, if yes, reset the timing
+ */
+ if (info->cs != host->cs) {
+ info->cs = host->cs;
+ nand_writel(info, NDTR0CS0, host->ndtr0cs0);
+ nand_writel(info, NDTR1CS0, host->ndtr1cs0);
+ }
+
info->state = STATE_PREPARED;
exec_cmd = prepare_command_pool(info, command, column, page_addr);
if (exec_cmd) {
@@ -778,7 +805,7 @@
{
struct platform_device *pdev = info->pdev;
struct pxa3xx_nand_platform_data *pdata = pdev->dev.platform_data;
- struct pxa3xx_nand_host *host = info->host;
+ struct pxa3xx_nand_host *host = info->host[info->cs];
uint32_t ndcr = 0x0; /* enable all interrupts */
if (f->page_size != 2048 && f->page_size != 512) {
@@ -822,7 +849,11 @@
static int pxa3xx_nand_detect_config(struct pxa3xx_nand_info *info)
{
- struct pxa3xx_nand_host *host = info->host;
+ /*
+ * We set 0 by hard coding here, for we don't support keep_config
+ * when there is more than one chip attached to the controller
+ */
+ struct pxa3xx_nand_host *host = info->host[0];
uint32_t ndcr = nand_readl(info, NDCR);
if (ndcr & NDCR_PAGE_SZ) {
@@ -884,9 +915,9 @@
static int pxa3xx_nand_sensing(struct pxa3xx_nand_info *info)
{
- struct mtd_info *mtd = info->host->mtd;
+ struct mtd_info *mtd;
int ret;
-
+ mtd = info->host[info->cs]->mtd;
/* use the common timing to make a try */
ret = pxa3xx_nand_config_flash(info, &builtin_flash_types[0]);
if (ret)
@@ -917,7 +948,8 @@
ret = pxa3xx_nand_sensing(info);
if (ret) {
- dev_info(&info->pdev->dev, "There is no nand chip on cs 0!\n");
+ dev_info(&info->pdev->dev, "There is no chip on cs %d!\n",
+ info->cs);
return ret;
}
@@ -996,41 +1028,47 @@
static int alloc_nand_resource(struct platform_device *pdev)
{
+ struct pxa3xx_nand_platform_data *pdata;
struct pxa3xx_nand_info *info;
struct pxa3xx_nand_host *host;
struct nand_chip *chip;
struct mtd_info *mtd;
struct resource *r;
- int ret, irq;
+ int ret, irq, cs;
- info = kzalloc(sizeof(*info) + sizeof(*mtd) + sizeof(*host),
- GFP_KERNEL);
+ pdata = pdev->dev.platform_data;
+ info = kzalloc(sizeof(*info) + (sizeof(*mtd) +
+ sizeof(*host)) * pdata->num_cs, GFP_KERNEL);
if (!info) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
- mtd = (struct mtd_info *)(&info[1]);
- chip = (struct nand_chip *)(&mtd[1]);
- host = (struct pxa3xx_nand_host *)chip;
info->pdev = pdev;
- info->host = host;
- host->mtd = mtd;
- host->info_data = info;
- mtd->priv = host;
- mtd->owner = THIS_MODULE;
+ for (cs = 0; cs < pdata->num_cs; cs++) {
+ mtd = (struct mtd_info *)((unsigned int)&info[1] +
+ (sizeof(*mtd) + sizeof(*host)) * cs);
+ chip = (struct nand_chip *)(&mtd[1]);
+ host = (struct pxa3xx_nand_host *)chip;
+ info->host[cs] = host;
+ host->mtd = mtd;
+ host->cs = cs;
+ host->info_data = info;
+ mtd->priv = host;
+ mtd->owner = THIS_MODULE;
- chip->ecc.read_page = pxa3xx_nand_read_page_hwecc;
- chip->ecc.write_page = pxa3xx_nand_write_page_hwecc;
- chip->controller = &info->controller;
- chip->waitfunc = pxa3xx_nand_waitfunc;
- chip->select_chip = pxa3xx_nand_select_chip;
- chip->cmdfunc = pxa3xx_nand_cmdfunc;
- chip->read_word = pxa3xx_nand_read_word;
- chip->read_byte = pxa3xx_nand_read_byte;
- chip->read_buf = pxa3xx_nand_read_buf;
- chip->write_buf = pxa3xx_nand_write_buf;
- chip->verify_buf = pxa3xx_nand_verify_buf;
+ chip->ecc.read_page = pxa3xx_nand_read_page_hwecc;
+ chip->ecc.write_page = pxa3xx_nand_write_page_hwecc;
+ chip->controller = &info->controller;
+ chip->waitfunc = pxa3xx_nand_waitfunc;
+ chip->select_chip = pxa3xx_nand_select_chip;
+ chip->cmdfunc = pxa3xx_nand_cmdfunc;
+ chip->read_word = pxa3xx_nand_read_word;
+ chip->read_byte = pxa3xx_nand_read_byte;
+ chip->read_buf = pxa3xx_nand_read_buf;
+ chip->write_buf = pxa3xx_nand_write_buf;
+ chip->verify_buf = pxa3xx_nand_verify_buf;
+ }
spin_lock_init(&chip->controller->lock);
init_waitqueue_head(&chip->controller->wq);
@@ -1128,12 +1166,14 @@
static int pxa3xx_nand_remove(struct platform_device *pdev)
{
struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
+ struct pxa3xx_nand_platform_data *pdata;
struct resource *r;
- int irq;
+ int irq, cs;
if (!info)
return 0;
+ pdata = pdev->dev.platform_data;
platform_set_drvdata(pdev, NULL);
irq = platform_get_irq(pdev, 0);
@@ -1153,7 +1193,8 @@
clk_disable(info->clk);
clk_put(info->clk);
- nand_release(info->host->mtd);
+ for (cs = 0; cs < pdata->num_cs; cs++)
+ nand_release(info->host[cs]->mtd);
kfree(info);
return 0;
}
@@ -1162,7 +1203,7 @@
{
struct pxa3xx_nand_platform_data *pdata;
struct pxa3xx_nand_info *info;
- int ret;
+ int ret, cs, probe_success;
pdata = pdev->dev.platform_data;
if (!pdata) {
@@ -1177,41 +1218,69 @@
}
info = platform_get_drvdata(pdev);
- if (pxa3xx_nand_scan(info->host->mtd)) {
- dev_err(&pdev->dev, "failed to scan nand\n");
+ probe_success = 0;
+ for (cs = 0; cs < pdata->num_cs; cs++) {
+ info->cs = cs;
+ ret = pxa3xx_nand_scan(info->host[cs]->mtd);
+ if (ret) {
+ dev_warn(&pdev->dev, "failed to scan nand at cs %d\n",
+ cs);
+ continue;
+ }
+
+ ret = mtd_device_parse_register(info->host[cs]->mtd, NULL, 0,
+ pdata->parts[cs], pdata->nr_parts[cs]);
+ if (!ret)
+ probe_success = 1;
+ }
+
+ if (!probe_success) {
pxa3xx_nand_remove(pdev);
return -ENODEV;
}
- return mtd_device_parse_register(info->host->mtd, NULL, 0,
- pdata->parts, pdata->nr_parts);
+ return 0;
}
#ifdef CONFIG_PM
static int pxa3xx_nand_suspend(struct platform_device *pdev, pm_message_t state)
{
struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
- struct mtd_info *mtd = info->mtd;
+ struct pxa3xx_nand_platform_data *pdata;
+ struct mtd_info *mtd;
+ int cs;
+ pdata = pdev->dev.platform_data;
if (info->state) {
dev_err(&pdev->dev, "driver busy, state = %d\n", info->state);
return -EAGAIN;
}
- mtd->suspend(mtd);
+ for (cs = 0; cs < pdata->num_cs; cs++) {
+ mtd = info->host[cs]->mtd;
+ mtd->suspend(mtd);
+ }
+
return 0;
}
static int pxa3xx_nand_resume(struct platform_device *pdev)
{
struct pxa3xx_nand_info *info = platform_get_drvdata(pdev);
- struct mtd_info *mtd = info->mtd;
+ struct pxa3xx_nand_platform_data *pdata;
+ struct mtd_info *mtd;
+ int cs;
+ pdata = pdev->dev.platform_data;
/* We don't want to handle interrupt without calling mtd routine */
disable_int(info, NDCR_INT_MASK);
- nand_writel(info, NDTR0CS0, info->host->ndtr0cs0);
- nand_writel(info, NDTR1CS0, info->host->ndtr1cs0);
+ /*
+ * Directly set the chip select to a invalid value,
+ * then the driver would reset the timing according
+ * to current chip select at the beginning of cmdfunc
+ */
+ info->cs = 0xff;
/*
* As the spec says, the NDSR would be updated to 0x1800 when
@@ -1220,7 +1289,11 @@
* all status before resume
*/
nand_writel(info, NDSR, NDSR_MASK);
- mtd->resume(mtd);
+ for (cs = 0; cs < pdata->num_cs; cs++) {
+ mtd = info->host[cs]->mtd;
+ mtd->resume(mtd);
+ }
+
return 0;
}
#else