This series adds support for configuring Samsung's S3C24XX MMC/SD/SDIO
controller via device tree.
Tested on FriendlyARM mini2440, based on s3c2440 SoC.
Changes since v1:
- pinctrl description removed from DT binding
- unit and label on DT binding renamed to mmc
Sergio Prado (2):
dt-bindings: mmc: add DT binding for S3C24XX MMC/SD/SDIO controller
mmc: host: s3cmci: allow probing from device tree
.../devicetree/bindings/mmc/samsung,s3cmci.txt | 34 +++++
drivers/mmc/host/s3cmci.c | 155 +++++++++++++++++----
2 files changed, 165 insertions(+), 24 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mmc/samsung,s3cmci.txt
--
1.9.1
Adds the device tree bindings description for Samsung S3C24XX
MMC/SD/SDIO controller, used as a connectivity interface with external
MMC, SD and SDIO storage mediums.
Signed-off-by: Sergio Prado <[email protected]>
Acked-by: Rob Herring <[email protected]>
---
.../devicetree/bindings/mmc/samsung,s3cmci.txt | 34 ++++++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/samsung,s3cmci.txt
diff --git a/Documentation/devicetree/bindings/mmc/samsung,s3cmci.txt b/Documentation/devicetree/bindings/mmc/samsung,s3cmci.txt
new file mode 100644
index 000000000000..d09dbf4b3824
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/samsung,s3cmci.txt
@@ -0,0 +1,34 @@
+* Samsung's S3C24XX MMC/SD/SDIO controller device tree bindings
+
+Samsung's S3C24XX MMC/SD/SDIO controller is used as a connectivity interface
+with external MMC, SD and SDIO storage mediums.
+
+This file documents differences between the core mmc properties described by
+mmc.txt and the properties used by the Samsung S3C24XX MMC/SD/SDIO controller
+implementation.
+
+Required SoC Specific Properties:
+- compatible: should be one of the following
+ - "samsung,s3c2410-sdi": for controllers compatible with s3c2410
+ - "samsung,s3c2412-sdi": for controllers compatible with s3c2412
+ - "samsung,s3c2440-sdi": for controllers compatible with s3c2440
+- clocks: Should reference the controller clock
+- clock-names: Should contain "sdi"
+
+Example:
+ mmc0: mmc@5a000000 {
+ compatible = "samsung,s3c2440-sdi";
+ pinctrl-names = "default";
+ pinctrl-0 = <&sdi_pins>;
+ reg = <0x5a000000 0x100000>;
+ interrupts = <0 0 21 3>;
+ clocks = <&clocks PCLK_SDI>;
+ clock-names = "sdi";
+ bus-width = <4>;
+ cd-gpios = <&gpg 8 GPIO_ACTIVE_LOW>;
+ wp-gpios = <&gph 8 GPIO_ACTIVE_LOW>;
+ };
+
+ Note: This example shows both SoC specific and board specific properties
+ in a single device node. The properties can be actually be separated
+ into SoC specific node and board specific node.
--
1.9.1
Allows configuring Samsung S3C24XX MMC/SD/SDIO controller using a device
tree.
Signed-off-by: Sergio Prado <[email protected]>
---
drivers/mmc/host/s3cmci.c | 155 +++++++++++++++++++++++++++++++++++++++-------
1 file changed, 131 insertions(+), 24 deletions(-)
diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 932a4b1fed33..bfeb90e8ffee 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -23,6 +23,9 @@
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <plat/gpio-cfg.h>
#include <mach/dma.h>
@@ -127,6 +130,22 @@ enum dbg_channels {
dbg_conf = (1 << 8),
};
+struct s3cmci_drv_data {
+ int is2440;
+};
+
+static const struct s3cmci_drv_data s3c2410_s3cmci_drv_data = {
+ .is2440 = 0,
+};
+
+static const struct s3cmci_drv_data s3c2412_s3cmci_drv_data = {
+ .is2440 = 1,
+};
+
+static const struct s3cmci_drv_data s3c2440_s3cmci_drv_data = {
+ .is2440 = 1,
+};
+
static const int dbgmap_err = dbg_fail;
static const int dbgmap_info = dbg_info | dbg_conf;
static const int dbgmap_debug = dbg_err | dbg_debug;
@@ -1241,8 +1260,9 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
case MMC_POWER_ON:
case MMC_POWER_UP:
/* Configure GPE5...GPE10 pins in SD mode */
- s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
- S3C_GPIO_PULL_NONE);
+ if (!host->pdev->dev.of_node)
+ s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
+ S3C_GPIO_PULL_NONE);
if (host->pdata->set_power)
host->pdata->set_power(ios->power_mode, ios->vdd);
@@ -1254,7 +1274,8 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
case MMC_POWER_OFF:
default:
- gpio_direction_output(S3C2410_GPE(5), 0);
+ if (!host->pdev->dev.of_node)
+ gpio_direction_output(S3C2410_GPE(5), 0);
if (host->is2440)
mci_con |= S3C2440_SDICON_SDRESET;
@@ -1544,21 +1565,12 @@ static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
#endif /* CONFIG_DEBUG_FS */
-static int s3cmci_probe(struct platform_device *pdev)
+static int s3cmci_probe_pdata(struct s3cmci_host *host)
{
- struct s3cmci_host *host;
- struct mmc_host *mmc;
- int ret;
- int is2440;
- int i;
+ struct platform_device *pdev = host->pdev;
+ int i, ret;
- is2440 = platform_get_device_id(pdev)->driver_data;
-
- mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
- if (!mmc) {
- ret = -ENOMEM;
- goto probe_out;
- }
+ host->is2440 = platform_get_device_id(pdev)->driver_data;
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
ret = gpio_request(i, dev_name(&pdev->dev));
@@ -1568,14 +1580,90 @@ static int s3cmci_probe(struct platform_device *pdev)
for (i--; i >= S3C2410_GPE(5); i--)
gpio_free(i);
- goto probe_free_host;
+ return ret;
}
}
+ return 0;
+}
+
+static int s3cmci_probe_dt(struct s3cmci_host *host)
+{
+ struct platform_device *pdev = host->pdev;
+ struct s3c24xx_mci_pdata *pdata;
+ const struct s3cmci_drv_data *drvdata;
+ struct mmc_host *mmc = host->mmc;
+ int gpio, ret;
+
+ drvdata = of_device_get_match_data(&pdev->dev);
+ if (!drvdata)
+ return -ENODEV;
+
+ host->is2440 = drvdata->is2440;
+
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ return ret;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->ocr_avail = mmc->ocr_avail;
+
+ if (mmc->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
+ pdata->no_wprotect = 1;
+
+ if (mmc->caps & MMC_CAP_NEEDS_POLL)
+ pdata->no_detect = 1;
+
+ if (mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH)
+ pdata->wprotect_invert = 1;
+
+ if (mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)
+ pdata->detect_invert = 1;
+
+ gpio = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
+ if (gpio_is_valid(gpio)) {
+ pdata->gpio_detect = gpio;
+ gpio_free(gpio);
+ }
+
+ gpio = of_get_named_gpio(pdev->dev.of_node, "wp-gpios", 0);
+ if (gpio_is_valid(gpio)) {
+ pdata->gpio_wprotect = gpio;
+ gpio_free(gpio);
+ }
+
+ pdev->dev.platform_data = pdata;
+
+ return 0;
+}
+
+static int s3cmci_probe(struct platform_device *pdev)
+{
+ struct s3cmci_host *host;
+ struct mmc_host *mmc;
+ int ret;
+ int i;
+
+ mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
+ if (!mmc) {
+ ret = -ENOMEM;
+ goto probe_out;
+ }
+
host = mmc_priv(mmc);
host->mmc = mmc;
host->pdev = pdev;
- host->is2440 = is2440;
+
+ if (pdev->dev.of_node)
+ ret = s3cmci_probe_dt(host);
+ else
+ ret = s3cmci_probe_pdata(host);
+
+ if (ret)
+ goto probe_free_host;
host->pdata = pdev->dev.platform_data;
if (!host->pdata) {
@@ -1586,7 +1674,7 @@ static int s3cmci_probe(struct platform_device *pdev)
spin_lock_init(&host->complete_lock);
tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
- if (is2440) {
+ if (host->is2440) {
host->sdiimsk = S3C2440_SDIIMSK;
host->sdidata = S3C2440_SDIDATA;
host->clk_div = 1;
@@ -1789,8 +1877,9 @@ static int s3cmci_probe(struct platform_device *pdev)
release_mem_region(host->mem->start, resource_size(host->mem));
probe_free_gpio:
- for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
- gpio_free(i);
+ if (!pdev->dev.of_node)
+ for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
+ gpio_free(i);
probe_free_host:
mmc_free_host(mmc);
@@ -1837,9 +1926,9 @@ static int s3cmci_remove(struct platform_device *pdev)
if (!pd->no_detect)
gpio_free(pd->gpio_detect);
- for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
- gpio_free(i);
-
+ if (!pdev->dev.of_node)
+ for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
+ gpio_free(i);
iounmap(host->base);
release_mem_region(host->mem->start, resource_size(host->mem));
@@ -1848,6 +1937,23 @@ static int s3cmci_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id s3cmci_dt_match[] = {
+ {
+ .compatible = "samsung,s3c2410-sdi",
+ .data = &s3c2410_s3cmci_drv_data,
+ },
+ {
+ .compatible = "samsung,s3c2412-sdi",
+ .data = &s3c2412_s3cmci_drv_data,
+ },
+ {
+ .compatible = "samsung,s3c2440-sdi",
+ .data = &s3c2440_s3cmci_drv_data,
+ },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
+
static const struct platform_device_id s3cmci_driver_ids[] = {
{
.name = "s3c2410-sdi",
@@ -1867,6 +1973,7 @@ static int s3cmci_remove(struct platform_device *pdev)
static struct platform_driver s3cmci_driver = {
.driver = {
.name = "s3c-sdi",
+ .of_match_table = s3cmci_dt_match,
},
.id_table = s3cmci_driver_ids,
.probe = s3cmci_probe,
--
1.9.1
On 9 December 2016 at 14:14, Sergio Prado <[email protected]> wrote:
> Allows configuring Samsung S3C24XX MMC/SD/SDIO controller using a device
> tree.
>
> Signed-off-by: Sergio Prado <[email protected]>
> ---
> drivers/mmc/host/s3cmci.c | 155 +++++++++++++++++++++++++++++++++++++++-------
> 1 file changed, 131 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
> index 932a4b1fed33..bfeb90e8ffee 100644
> --- a/drivers/mmc/host/s3cmci.c
> +++ b/drivers/mmc/host/s3cmci.c
> @@ -23,6 +23,9 @@
> #include <linux/gpio.h>
> #include <linux/irq.h>
> #include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
>
> #include <plat/gpio-cfg.h>
> #include <mach/dma.h>
> @@ -127,6 +130,22 @@ enum dbg_channels {
> dbg_conf = (1 << 8),
> };
>
> +struct s3cmci_drv_data {
> + int is2440;
This doesn't say much.
Please use a more descriptive variable name and rename the struct to
perhaps "variant_data", because I guess that is what this is?
> +};
> +
> +static const struct s3cmci_drv_data s3c2410_s3cmci_drv_data = {
> + .is2440 = 0,
> +};
> +
> +static const struct s3cmci_drv_data s3c2412_s3cmci_drv_data = {
> + .is2440 = 1,
> +};
> +
> +static const struct s3cmci_drv_data s3c2440_s3cmci_drv_data = {
> + .is2440 = 1,
> +};
> +
> static const int dbgmap_err = dbg_fail;
> static const int dbgmap_info = dbg_info | dbg_conf;
> static const int dbgmap_debug = dbg_err | dbg_debug;
> @@ -1241,8 +1260,9 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> case MMC_POWER_ON:
> case MMC_POWER_UP:
> /* Configure GPE5...GPE10 pins in SD mode */
> - s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
> - S3C_GPIO_PULL_NONE);
> + if (!host->pdev->dev.of_node)
> + s3c_gpio_cfgall_range(S3C2410_GPE(5), 6, S3C_GPIO_SFN(2),
> + S3C_GPIO_PULL_NONE);
>
> if (host->pdata->set_power)
> host->pdata->set_power(ios->power_mode, ios->vdd);
> @@ -1254,7 +1274,8 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>
> case MMC_POWER_OFF:
> default:
> - gpio_direction_output(S3C2410_GPE(5), 0);
> + if (!host->pdev->dev.of_node)
> + gpio_direction_output(S3C2410_GPE(5), 0);
>
> if (host->is2440)
> mci_con |= S3C2440_SDICON_SDRESET;
> @@ -1544,21 +1565,12 @@ static inline void s3cmci_debugfs_remove(struct s3cmci_host *host) { }
>
> #endif /* CONFIG_DEBUG_FS */
>
> -static int s3cmci_probe(struct platform_device *pdev)
> +static int s3cmci_probe_pdata(struct s3cmci_host *host)
> {
> - struct s3cmci_host *host;
> - struct mmc_host *mmc;
> - int ret;
> - int is2440;
> - int i;
> + struct platform_device *pdev = host->pdev;
> + int i, ret;
>
> - is2440 = platform_get_device_id(pdev)->driver_data;
> -
> - mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
> - if (!mmc) {
> - ret = -ENOMEM;
> - goto probe_out;
> - }
> + host->is2440 = platform_get_device_id(pdev)->driver_data;
>
> for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++) {
> ret = gpio_request(i, dev_name(&pdev->dev));
> @@ -1568,14 +1580,90 @@ static int s3cmci_probe(struct platform_device *pdev)
> for (i--; i >= S3C2410_GPE(5); i--)
> gpio_free(i);
>
> - goto probe_free_host;
> + return ret;
> }
> }
>
> + return 0;
> +}
> +
> +static int s3cmci_probe_dt(struct s3cmci_host *host)
> +{
> + struct platform_device *pdev = host->pdev;
> + struct s3c24xx_mci_pdata *pdata;
> + const struct s3cmci_drv_data *drvdata;
> + struct mmc_host *mmc = host->mmc;
> + int gpio, ret;
> +
> + drvdata = of_device_get_match_data(&pdev->dev);
> + if (!drvdata)
> + return -ENODEV;
> +
> + host->is2440 = drvdata->is2440;
Instead of copying only the member, perhaps assign a host->variant
pointer to the drvdata instead, as that allows to extend the
information for the variant to cover more things than only "is2440",
while going forward.
In other words:
host->variant = of_device_get_match_data(&pdev->dev);
> +
> + ret = mmc_of_parse(mmc);
> + if (ret)
> + return ret;
> +
> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENOMEM;
> +
> + pdata->ocr_avail = mmc->ocr_avail;
> +
> + if (mmc->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
> + pdata->no_wprotect = 1;
> +
> + if (mmc->caps & MMC_CAP_NEEDS_POLL)
> + pdata->no_detect = 1;
> +
> + if (mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH)
> + pdata->wprotect_invert = 1;
> +
> + if (mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH)
> + pdata->detect_invert = 1;
> +
> + gpio = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
This should already be covered via mmc_of_parse().
> + if (gpio_is_valid(gpio)) {
> + pdata->gpio_detect = gpio;
> + gpio_free(gpio);
> + }
> +
> + gpio = of_get_named_gpio(pdev->dev.of_node, "wp-gpios", 0);
This should already be covered via mmc_of_parse().
> + if (gpio_is_valid(gpio)) {
> + pdata->gpio_wprotect = gpio;
> + gpio_free(gpio);
> + }
> +
> + pdev->dev.platform_data = pdata;
> +
> + return 0;
> +}
> +
> +static int s3cmci_probe(struct platform_device *pdev)
> +{
> + struct s3cmci_host *host;
> + struct mmc_host *mmc;
> + int ret;
> + int i;
> +
> + mmc = mmc_alloc_host(sizeof(struct s3cmci_host), &pdev->dev);
> + if (!mmc) {
> + ret = -ENOMEM;
> + goto probe_out;
> + }
> +
> host = mmc_priv(mmc);
> host->mmc = mmc;
> host->pdev = pdev;
> - host->is2440 = is2440;
> +
> + if (pdev->dev.of_node)
> + ret = s3cmci_probe_dt(host);
> + else
> + ret = s3cmci_probe_pdata(host);
> +
> + if (ret)
> + goto probe_free_host;
>
> host->pdata = pdev->dev.platform_data;
> if (!host->pdata) {
> @@ -1586,7 +1674,7 @@ static int s3cmci_probe(struct platform_device *pdev)
> spin_lock_init(&host->complete_lock);
> tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);
>
> - if (is2440) {
> + if (host->is2440) {
> host->sdiimsk = S3C2440_SDIIMSK;
> host->sdidata = S3C2440_SDIDATA;
> host->clk_div = 1;
> @@ -1789,8 +1877,9 @@ static int s3cmci_probe(struct platform_device *pdev)
> release_mem_region(host->mem->start, resource_size(host->mem));
>
> probe_free_gpio:
> - for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
> - gpio_free(i);
> + if (!pdev->dev.of_node)
> + for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
> + gpio_free(i);
>
> probe_free_host:
> mmc_free_host(mmc);
> @@ -1837,9 +1926,9 @@ static int s3cmci_remove(struct platform_device *pdev)
> if (!pd->no_detect)
> gpio_free(pd->gpio_detect);
>
> - for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
> - gpio_free(i);
> -
> + if (!pdev->dev.of_node)
> + for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
> + gpio_free(i);
>
> iounmap(host->base);
> release_mem_region(host->mem->start, resource_size(host->mem));
> @@ -1848,6 +1937,23 @@ static int s3cmci_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static const struct of_device_id s3cmci_dt_match[] = {
> + {
> + .compatible = "samsung,s3c2410-sdi",
> + .data = &s3c2410_s3cmci_drv_data,
> + },
> + {
> + .compatible = "samsung,s3c2412-sdi",
> + .data = &s3c2412_s3cmci_drv_data,
> + },
> + {
> + .compatible = "samsung,s3c2440-sdi",
> + .data = &s3c2440_s3cmci_drv_data,
> + },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
> +
> static const struct platform_device_id s3cmci_driver_ids[] = {
> {
> .name = "s3c2410-sdi",
> @@ -1867,6 +1973,7 @@ static int s3cmci_remove(struct platform_device *pdev)
> static struct platform_driver s3cmci_driver = {
> .driver = {
> .name = "s3c-sdi",
> + .of_match_table = s3cmci_dt_match,
> },
> .id_table = s3cmci_driver_ids,
> .probe = s3cmci_probe,
> --
> 1.9.1
>
Kind regards
Uffe