Signed-off-by: Raphaël Poggi <poggi.r...@gmail.com>
---
drivers/mtd/nand/atmel_nand.c | 111 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 110 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 2246602..910ecc3 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -28,6 +28,10 @@
#include <init.h>
#include <gpio.h>
+#include <of.h>
+#include <of_gpio.h>
+#include <of_mtd.h>
+
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
@@ -1038,6 +1042,92 @@ static void atmel_nand_hwctl(struct mtd_info *mtd, int
mode)
#endif
}
+static int atmel_nand_of_init(struct atmel_nand_host *host, struct device_node
*np)
+{
+ u32 val;
+ u32 offset[2];
+ int ecc_mode;
+ struct atmel_nand_data *board = host->board;
+ enum of_gpio_flags flags = 0;
+
+ if (!IS_ENABLED(CONFIG_OFDEVICE))
+ return -ENOSYS;
+
+ if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
+ if (val >= 32) {
+ dev_err(host->dev, "invalid addr-offset %u\n", val);
+ return -EINVAL;
+ }
+ board->ale = val;
+ }
+
+ if (of_property_read_u32(np, "atmel,nand-cmd-offset", &val) == 0) {
+ if (val >= 32) {
+ dev_err(host->dev, "invalid cmd-offset %u\n", val);
+ return -EINVAL;
+ }
+ board->cle = val;
+ }
+
+ ecc_mode = of_get_nand_ecc_mode(np);
+
+ board->ecc_mode = ecc_mode < 0 ? NAND_ECC_SOFT : ecc_mode;
+
+ board->on_flash_bbt = of_get_nand_on_flash_bbt(np);
+
+ if (of_get_nand_bus_width(np) == 16)
+ board->bus_width_16 = 1;
+
+ board->rdy_pin = of_get_gpio_flags(np, 0, &flags);
+ board->enable_pin = of_get_gpio(np, 1);
+ board->det_pin = of_get_gpio(np, 2);
+
+ board->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc");
+
+ if (!(board->ecc_mode == NAND_ECC_HW) || !board->has_pmecc)
+ return 0; /* Not using PMECC */
+
+ /* use PMECC, get correction capability, sector size and lookup
+ * table offset.
+ * If correction bits and sector size are not specified, then
+ * find
+ * them from NAND ONFI parameters.
+ */
+ if (of_property_read_u32(np, "atmel,pmecc-cap", &val) == 0) {
+ if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
(val != 24)) {
+ dev_err(host->dev, "Unsupported PMECC correction
capability: %d"
+ " should be 2, 4, 8, 12 or 24\n", val);
+ return -EINVAL;
+ }
+
+ board->pmecc_corr_cap = (u8)val;
+ }
+
+ if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) == 0) {
+ if ((val != 512) && (val != 1024)) {
+ dev_err(host->dev, "Unsupported PMECC sector
size: %d"
+ " should be 512 or 1024 bytes\n", val);
+ return -EINVAL;
+ }
+
+ board->pmecc_sector_size = (u16)val;
+ }
+
+ if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset",
offset, 2) != 0) {
+ dev_err(host->dev, "Cannot get PMECC lookup table offset\n");
+ return -EINVAL;
+ }
+
+ if (!offset[0] && !offset[1]) {
+ dev_err(host->dev, "Invalid PMECC lookup table offset\n");
+ return -EINVAL;
+ }
+
+ board->pmecc_lookup_table_offset = (board->pmecc_sector_size == 512) ?
offset[0] : offset[1];
+
+ return 0;
+}
+
static int atmel_hw_nand_init_params(struct device_d *dev,
struct atmel_nand_host *host)
{
@@ -1093,7 +1183,7 @@ static int atmel_hw_nand_init_params(struct device_d *dev,
*/
static int __init atmel_nand_probe(struct device_d *dev)
{
- struct atmel_nand_data *pdata = dev->platform_data;
+ struct atmel_nand_data *pdata = NULL;
struct atmel_nand_host *host;
struct mtd_info *mtd;
struct nand_chip *nand_chip;
@@ -1111,6 +1201,18 @@ static int __init atmel_nand_probe(struct device_d *dev)
host->board = pdata;
host->dev = dev;
+ if (dev->device_node) {
+ res = atmel_nand_of_init(host, dev->device_node);
+ if (res)
+ goto err_no_card;
+ } else {
+ pdata = kzalloc(sizeof(struct atmel_nand_data), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ memcpy(host->board, dev->platform_data, sizeof(struct
atmel_nand_data));
+ }
+
nand_chip->priv = host; /* link the private data structures */
mtd->priv = nand_chip;
mtd->parent = dev;
@@ -1245,13 +1347,20 @@ err_hw_ecc:
err_scan_ident:
err_no_card:
atmel_nand_disable(host);
+ kfree(pdata);
kfree(host);
return res;
}
+static struct of_device_id atmel_nand_dt_ids[] = {
+ { .compatible = "atmel,at91rm9200-nand" },
+ { /* sentinel */ }
+};
+
static struct driver_d atmel_nand_driver = {
.name = "atmel_nand",
.probe = atmel_nand_probe,
+ .of_compatible = DRV_OF_COMPAT(atmel_nand_dt_ids),
};
device_platform_driver(atmel_nand_driver);
--
1.7.9.5
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