FMC2 IP supports up to 4 chip select. On MP1 SoC, only 2 of them are
available when on MP25 SoC, the 4 chip select are available.
Let's use a platform data structure for parameters that will differ.
Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
---
Changes in v2:
- V1 patch 10, 11 and 12 have been squashed and reworked.
- a platform data structure is handling the difference between MP1 and MP25.
drivers/mtd/nand/raw/stm32_fmc2_nand.c | 54 +++++++++++++++++++++-----
1 file changed, 45 insertions(+), 9 deletions(-)
diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index a7db7b675514..264556939a00 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/mtd/rawnand.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
@@ -37,7 +38,7 @@
#define FMC2_MAX_SG 16
/* Max chip enable */
-#define FMC2_MAX_CE 2
+#define FMC2_MAX_CE 4
/* Max ECC buffer length */
#define FMC2_MAX_ECC_BUF_LEN (FMC2_BCHDSRS_LEN * FMC2_MAX_SG)
@@ -243,6 +244,13 @@ static inline struct stm32_fmc2_nand *to_fmc2_nand(struct nand_chip *chip)
return container_of(chip, struct stm32_fmc2_nand, chip);
}
+struct stm32_fmc2_nfc;
+
+struct stm32_fmc2_nfc_data {
+ int max_ncs;
+ int (*set_cdev)(struct stm32_fmc2_nfc *nfc);
+};
+
struct stm32_fmc2_nfc {
struct nand_controller base;
struct stm32_fmc2_nand nand;
@@ -256,6 +264,7 @@ struct stm32_fmc2_nfc {
phys_addr_t data_phys_addr[FMC2_MAX_CE];
struct clk *clk;
u8 irq_state;
+ const struct stm32_fmc2_nfc_data *data;
struct dma_chan *dma_tx_ch;
struct dma_chan *dma_rx_ch;
@@ -1809,7 +1818,7 @@ static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc,
return ret;
}
- if (cs >= FMC2_MAX_CE) {
+ if (cs >= nfc->data->max_ncs) {
dev_err(nfc->dev, "invalid reg value: %d\n", cs);
return -EINVAL;
}
@@ -1915,9 +1924,17 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
nand_controller_init(&nfc->base);
nfc->base.ops = &stm32_fmc2_nfc_controller_ops;
- ret = stm32_fmc2_nfc_set_cdev(nfc);
- if (ret)
- return ret;
+ nfc->data = of_device_get_match_data(dev);
+ if (!nfc->data)
+ return -EINVAL;
+
+ if (nfc->data->set_cdev) {
+ ret = nfc->data->set_cdev(nfc);
+ if (ret)
+ return ret;
+ } else {
+ nfc->cdev = dev->parent;
+ }
ret = stm32_fmc2_nfc_parse_dt(nfc);
if (ret)
@@ -1936,7 +1953,7 @@ static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
if (nfc->dev == nfc->cdev)
start_region = 1;
- for (chip_cs = 0, mem_region = start_region; chip_cs < FMC2_MAX_CE;
+ for (chip_cs = 0, mem_region = start_region; chip_cs < nfc->data->max_ncs;
chip_cs++, mem_region += 3) {
if (!(nfc->cs_assigned & BIT(chip_cs)))
continue;
@@ -2092,7 +2109,7 @@ static int __maybe_unused stm32_fmc2_nfc_resume(struct device *dev)
stm32_fmc2_nfc_wp_disable(nand);
- for (chip_cs = 0; chip_cs < FMC2_MAX_CE; chip_cs++) {
+ for (chip_cs = 0; chip_cs < nfc->data->max_ncs; chip_cs++) {
if (!(nfc->cs_assigned & BIT(chip_cs)))
continue;
@@ -2105,9 +2122,28 @@ static int __maybe_unused stm32_fmc2_nfc_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(stm32_fmc2_nfc_pm_ops, stm32_fmc2_nfc_suspend,
stm32_fmc2_nfc_resume);
+static const struct stm32_fmc2_nfc_data stm32_fmc2_nfc_mp1_data = {
+ .max_ncs = 2,
+ .set_cdev = stm32_fmc2_nfc_set_cdev,
+};
+
+static const struct stm32_fmc2_nfc_data stm32_fmc2_nfc_mp25_data = {
+ .max_ncs = 4,
+};
+
static const struct of_device_id stm32_fmc2_nfc_match[] = {
- {.compatible = "st,stm32mp15-fmc2"},
- {.compatible = "st,stm32mp1-fmc2-nfc"},
+ {
+ .compatible = "st,stm32mp15-fmc2",
+ .data = &stm32_fmc2_nfc_mp1_data,
+ },
+ {
+ .compatible = "st,stm32mp1-fmc2-nfc",
+ .data = &stm32_fmc2_nfc_mp1_data,
+ },
+ {
+ .compatible = "st,stm32mp25-fmc2-nfc",
+ .data = &stm32_fmc2_nfc_mp25_data,
+ },
{}
};
MODULE_DEVICE_TABLE(of, stm32_fmc2_nfc_match);
--
2.25.1
