[PATCH v3 11/27] mtd: nand: omap: Clean up device tree support
From: Roger Quadros
Date: Fri Sep 18 2015 - 10:55:54 EST
Move NAND specific device tree parsing to NAND driver.
The NAND controller node must have a compatible id, register space
resource and interrupt resource.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
arch/arm/mach-omap2/gpmc-nand.c | 5 +-
drivers/memory/omap-gpmc.c | 135 ++++++--------------------
drivers/mtd/nand/omap2.c | 136 +++++++++++++++++++++++----
include/linux/platform_data/mtd-nand-omap2.h | 3 +-
4 files changed, 147 insertions(+), 132 deletions(-)
diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
index ffe646a..e07ca27 100644
--- a/arch/arm/mach-omap2/gpmc-nand.c
+++ b/arch/arm/mach-omap2/gpmc-nand.c
@@ -95,10 +95,7 @@ int gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data,
gpmc_nand_res[1].start = gpmc_get_irq();
memset(&s, 0, sizeof(struct gpmc_settings));
- if (gpmc_nand_data->of_node)
- gpmc_read_settings_dt(gpmc_nand_data->of_node, &s);
- else
- gpmc_set_legacy(gpmc_nand_data, &s);
+ gpmc_set_legacy(gpmc_nand_data, &s);
s.device_nand = true;
diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index e75226d..b09e1bc 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -29,7 +29,6 @@
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/omap-gpmc.h>
-#include <linux/mtd/nand.h>
#include <linux/pm_runtime.h>
#include <linux/platform_data/mtd-nand-omap2.h>
@@ -1716,105 +1715,6 @@ static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
of_property_read_bool(np, "gpmc,time-para-granularity");
}
-#if IS_ENABLED(CONFIG_MTD_NAND)
-
-static const char * const nand_xfer_types[] = {
- [NAND_OMAP_PREFETCH_POLLED] = "prefetch-polled",
- [NAND_OMAP_POLLED] = "polled",
- [NAND_OMAP_PREFETCH_DMA] = "prefetch-dma",
- [NAND_OMAP_PREFETCH_IRQ] = "prefetch-irq",
-};
-
-static int gpmc_probe_nand_child(struct platform_device *pdev,
- struct device_node *child)
-{
- u32 val;
- const char *s;
- struct gpmc_timings gpmc_t;
- struct omap_nand_platform_data *gpmc_nand_data;
-
- if (of_property_read_u32(child, "reg", &val) < 0) {
- dev_err(&pdev->dev, "%s has no 'reg' property\n",
- child->full_name);
- return -ENODEV;
- }
-
- gpmc_nand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_nand_data),
- GFP_KERNEL);
- if (!gpmc_nand_data)
- return -ENOMEM;
-
- gpmc_nand_data->cs = val;
- gpmc_nand_data->of_node = child;
-
- /* Detect availability of ELM module */
- gpmc_nand_data->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0);
- if (gpmc_nand_data->elm_of_node == NULL)
- gpmc_nand_data->elm_of_node =
- of_parse_phandle(child, "elm_id", 0);
-
- /* select ecc-scheme for NAND */
- if (of_property_read_string(child, "ti,nand-ecc-opt", &s)) {
- pr_err("%s: ti,nand-ecc-opt not found\n", __func__);
- return -ENODEV;
- }
-
- if (!strcmp(s, "sw"))
- gpmc_nand_data->ecc_opt = OMAP_ECC_HAM1_CODE_SW;
- else if (!strcmp(s, "ham1") ||
- !strcmp(s, "hw") || !strcmp(s, "hw-romcode"))
- gpmc_nand_data->ecc_opt =
- OMAP_ECC_HAM1_CODE_HW;
- else if (!strcmp(s, "bch4"))
- if (gpmc_nand_data->elm_of_node)
- gpmc_nand_data->ecc_opt =
- OMAP_ECC_BCH4_CODE_HW;
- else
- gpmc_nand_data->ecc_opt =
- OMAP_ECC_BCH4_CODE_HW_DETECTION_SW;
- else if (!strcmp(s, "bch8"))
- if (gpmc_nand_data->elm_of_node)
- gpmc_nand_data->ecc_opt =
- OMAP_ECC_BCH8_CODE_HW;
- else
- gpmc_nand_data->ecc_opt =
- OMAP_ECC_BCH8_CODE_HW_DETECTION_SW;
- else if (!strcmp(s, "bch16"))
- if (gpmc_nand_data->elm_of_node)
- gpmc_nand_data->ecc_opt =
- OMAP_ECC_BCH16_CODE_HW;
- else
- pr_err("%s: BCH16 requires ELM support\n", __func__);
- else
- pr_err("%s: ti,nand-ecc-opt invalid value\n", __func__);
-
- /* select data transfer mode for NAND controller */
- if (!of_property_read_string(child, "ti,nand-xfer-type", &s))
- for (val = 0; val < ARRAY_SIZE(nand_xfer_types); val++)
- if (!strcasecmp(s, nand_xfer_types[val])) {
- gpmc_nand_data->xfer_type = val;
- break;
- }
-
- gpmc_nand_data->flash_bbt = of_get_nand_on_flash_bbt(child);
-
- val = of_get_nand_bus_width(child);
- if (val == 16)
- gpmc_nand_data->devsize = NAND_BUSWIDTH_16;
-
- gpmc_read_timings_dt(child, &gpmc_t);
- gpmc_nand_init(gpmc_nand_data, &gpmc_t);
-
- return 0;
-}
-#else
-static int gpmc_probe_nand_child(struct platform_device *pdev,
- struct device_node *child)
-{
- return 0;
-}
-#endif
-
#if IS_ENABLED(CONFIG_MTD_ONENAND)
static int gpmc_probe_onenand_child(struct platform_device *pdev,
struct device_node *child)
@@ -1933,9 +1833,34 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
goto err;
}
- ret = of_property_read_u32(child, "bank-width", &gpmc_s.device_width);
- if (ret < 0)
- goto err;
+ if (of_node_cmp(child->name, "nand") == 0) {
+ /* NAND specific setup */
+ u32 val;
+
+ val = of_get_nand_bus_width(child);
+ switch (val) {
+ case 8:
+ gpmc_s.device_width = GPMC_DEVWIDTH_8BIT;
+ break;
+ case 16:
+ gpmc_s.device_width = GPMC_DEVWIDTH_16BIT;
+ break;
+ default:
+ dev_err(&pdev->dev, "%s: invalid 'nand-bus-width'\n",
+ child->name);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /* disable write protect */
+ gpmc_configure(GPMC_CONFIG_WP, 0);
+ gpmc_s.device_nand = true;
+ } else {
+ ret = of_property_read_u32(child, "bank-width",
+ &gpmc_s.device_width);
+ if (ret < 0)
+ goto err;
+ }
ret = gpmc_cs_program_settings(cs, &gpmc_s);
if (ret < 0)
@@ -2018,9 +1943,7 @@ static int gpmc_probe_dt(struct platform_device *pdev)
if (!child->name)
continue;
- if (of_node_cmp(child->name, "nand") == 0)
- ret = gpmc_probe_nand_child(pdev, child);
- else if (of_node_cmp(child->name, "onenand") == 0)
+ if (of_node_cmp(child->name, "onenand") == 0)
ret = gpmc_probe_onenand_child(pdev, child);
else
ret = gpmc_probe_generic_child(pdev, child);
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index c35405c..228f498 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_mtd.h>
#include <linux/mtd/nand_bch.h>
#include <linux/platform_data/elm.h>
@@ -177,6 +178,8 @@ struct omap_nand_info {
struct gpmc_nand_regs reg;
struct gpmc_nand_ops *ops;
/* generated at runtime depending on ECC algorithm and layout selected */
+ bool flash_bbt;
+ /* generated at runtime depending on ECC algorithm and layout */
struct nand_ecclayout oobinfo;
/* fields specific for BCHx_HW ECC scheme */
struct device *elm_dev;
@@ -1668,10 +1671,84 @@ static bool omap2_nand_ecc_check(struct omap_nand_info *info,
return true;
}
+static const char * const nand_xfer_types[] = {
+ [NAND_OMAP_PREFETCH_POLLED] = "prefetch-polled",
+ [NAND_OMAP_POLLED] = "polled",
+ [NAND_OMAP_PREFETCH_DMA] = "prefetch-dma",
+ [NAND_OMAP_PREFETCH_IRQ] = "prefetch-irq",
+};
+
+static int omap_get_dt_info(struct device *dev, struct omap_nand_info *info)
+{
+ struct device_node *child = dev->of_node;
+ int i;
+ const char *s;
+
+ /* In old bindings, CS num is embedded in reg property */
+ if (of_property_read_u32(child, "reg", &info->gpmc_cs) < 0) {
+ dev_err(dev, "reg not found in DT\n");
+ return -EINVAL;
+ }
+
+ /* detect availability of ELM module. Won't be present pre-OMAP4 */
+ info->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0);
+ if (!info->elm_of_node)
+ dev_dbg(dev, "ti,elm-id not in DT\n");
+
+ /* select ecc-scheme for NAND */
+ if (of_property_read_string(child, "ti,nand-ecc-opt", &s)) {
+ dev_err(dev, "ti,nand-ecc-opt not found\n");
+ return -EINVAL;
+ }
+
+ if (!strcmp(s, "sw")) {
+ info->ecc_opt = OMAP_ECC_HAM1_CODE_SW;
+ } else if (!strcmp(s, "ham1") ||
+ !strcmp(s, "hw") || !strcmp(s, "hw-romcode")) {
+ info->ecc_opt = OMAP_ECC_HAM1_CODE_HW;
+ } else if (!strcmp(s, "bch4")) {
+ if (info->elm_of_node)
+ info->ecc_opt = OMAP_ECC_BCH4_CODE_HW;
+ else
+ info->ecc_opt = OMAP_ECC_BCH4_CODE_HW_DETECTION_SW;
+ } else if (!strcmp(s, "bch8")) {
+ if (info->elm_of_node)
+ info->ecc_opt = OMAP_ECC_BCH8_CODE_HW;
+ else
+ info->ecc_opt = OMAP_ECC_BCH8_CODE_HW_DETECTION_SW;
+ } else if (!strcmp(s, "bch16")) {
+ info->ecc_opt = OMAP_ECC_BCH16_CODE_HW;
+ } else {
+ dev_err(dev, "unrecognized value for ti,nand-ecc-opt\n");
+ return -EINVAL;
+ }
+
+ /* select data transfer mode */
+ if (!of_property_read_string(child, "ti,nand-xfer-type", &s)) {
+ for (i = 0; i < ARRAY_SIZE(nand_xfer_types); i++) {
+ if (!strcasecmp(s, nand_xfer_types[i])) {
+ info->xfer_type = i;
+ goto next;
+ }
+ }
+
+ dev_err(dev, "unrecognized value for ti,nand-xfer-type\n");
+ return -EINVAL;
+ }
+
+next:
+ of_get_nand_on_flash_bbt(child);
+
+ if (of_get_nand_bus_width(child) == 16)
+ info->devsize = NAND_BUSWIDTH_16;
+
+ return 0;
+}
+
static int omap_nand_probe(struct platform_device *pdev)
{
struct omap_nand_info *info;
- struct omap_nand_platform_data *pdata;
+ struct omap_nand_platform_data *pdata = NULL;
struct mtd_info *mtd;
struct nand_chip *nand_chip;
struct nand_ecclayout *ecclayout;
@@ -1682,33 +1759,42 @@ static int omap_nand_probe(struct platform_device *pdev)
unsigned oob_index;
struct resource *res;
struct mtd_part_parser_data ppdata = {};
-
- pdata = dev_get_platdata(&pdev->dev);
- if (pdata == NULL) {
- dev_err(&pdev->dev, "platform data missing\n");
- return -ENODEV;
- }
+ struct device *dev = &pdev->dev;
info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
- platform_set_drvdata(pdev, info);
+ info->pdev = pdev;
+ if (dev->of_node) {
+ if (omap_get_dt_info(dev, info))
+ return -EINVAL;
+ } else {
+ pdata = dev_get_platdata(&pdev->dev);
+ if (!pdata) {
+ dev_err(&pdev->dev, "platform data missing\n");
+ return -EINVAL;
+ }
+
+ info->gpmc_cs = pdata->cs;
+ info->reg = pdata->reg;
+ info->of_node = pdata->of_node;
+ info->ecc_opt = pdata->ecc_opt;
+ info->dev_ready = pdata->dev_ready;
+ info->xfer_type = pdata->xfer_type;
+ info->devsize = pdata->devsize;
+ info->elm_of_node = pdata->elm_of_node;
+ info->flash_bbt = pdata->flash_bbt;
+ }
+
+ platform_set_drvdata(pdev, info);
info->ops = gpmc_omap_get_nand_ops(&info->reg, info->gpmc_cs);
if (!info->ops) {
dev_err(&pdev->dev, "Failed to get GPMC->NAND interface\n");
return -ENODEV;
}
- info->pdev = pdev;
- info->gpmc_cs = pdata->cs;
- info->of_node = pdata->of_node;
- info->ecc_opt = pdata->ecc_opt;
- info->dev_ready = pdata->dev_ready;
- info->xfer_type = pdata->xfer_type;
- info->devsize = pdata->devsize;
- info->elm_of_node = pdata->elm_of_node;
mtd = &info->mtd;
mtd->priv = &info->nand;
@@ -1744,7 +1830,7 @@ static int omap_nand_probe(struct platform_device *pdev)
nand_chip->chip_delay = 50;
}
- if (pdata->flash_bbt)
+ if (info->flash_bbt)
nand_chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
else
nand_chip->options |= NAND_SKIP_BBTSCAN;
@@ -2049,9 +2135,13 @@ scan_tail:
goto return_error;
}
- ppdata.of_node = pdata->of_node;
- mtd_device_parse_register(mtd, NULL, &ppdata, pdata->parts,
- pdata->nr_parts);
+ if (dev->of_node) {
+ ppdata.of_node = dev->of_node;
+ mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
+
+ } else {
+ mtd_device_register(mtd, pdata->parts, pdata->nr_parts);
+ }
platform_set_drvdata(pdev, mtd);
@@ -2083,11 +2173,17 @@ static int omap_nand_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id omap_nand_ids[] = {
+ { .compatible = "ti,omap2-nand", },
+ {},
+};
+
static struct platform_driver omap_nand_driver = {
.probe = omap_nand_probe,
.remove = omap_nand_remove,
.driver = {
.name = DRIVER_NAME,
+ .of_match_table = of_match_ptr(omap_nand_ids),
},
};
diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h
index a067f58..ff27e5a 100644
--- a/include/linux/platform_data/mtd-nand-omap2.h
+++ b/include/linux/platform_data/mtd-nand-omap2.h
@@ -76,11 +76,10 @@ struct omap_nand_platform_data {
int devsize;
enum omap_ecc ecc_opt;
- /* for passing the partitions */
- struct device_node *of_node;
struct device_node *elm_of_node;
/* deprecated */
struct gpmc_nand_regs reg;
+ struct device_node *of_node;
};
#endif
--
2.1.4
--
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