[PATCH v3 2/2] mmc: host: s3cmci: allow probing from device tree

From: Sergio Prado
Date: Fri Jan 13 2017 - 10:06:34 EST

Allows configuring Samsung S3C24XX MMC/SD/SDIO controller using a device
tree.

Signed-off-by: Sergio Prado <sergio.prado@xxxxxxxxxxxxxx>
---
drivers/mmc/host/s3cmci.c | 298 ++++++++++++++++++++++++----------------------
drivers/mmc/host/s3cmci.h | 3 +-
2 files changed, 158 insertions(+), 143 deletions(-)

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 932a4b1fed33..55535b65e0b3 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -23,6 +23,10 @@
#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 <linux/mmc/slot-gpio.h>

#include <plat/gpio-cfg.h>
#include <mach/dma.h>
@@ -127,6 +131,22 @@ enum dbg_channels {
dbg_conf = (1 << 8),
};

+struct s3cmci_variant_data {
+ int s3c2440_compatible;
+};
+
+static const struct s3cmci_variant_data s3c2410_s3cmci_variant_data = {
+ .s3c2440_compatible = 0,
+};
+
+static const struct s3cmci_variant_data s3c2412_s3cmci_variant_data = {
+ .s3c2440_compatible = 1,
+};
+
+static const struct s3cmci_variant_data s3c2440_s3cmci_variant_data = {
+ .s3c2440_compatible = 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;
@@ -730,7 +750,7 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)
goto clear_status_bits;

/* Check for FIFO failure */
- if (host->is2440) {
+ if (host->variant->s3c2440_compatible) {
if (mci_fsta & S3C2440_SDIFSTA_FIFOFAIL) {
dbg(host, dbg_err, "FIFO failure\n");
host->mrq->data->error = -EILSEQ;
@@ -806,21 +826,6 @@ static irqreturn_t s3cmci_irq(int irq, void *dev_id)

}

-/*
- * ISR for the CardDetect Pin
-*/
-
-static irqreturn_t s3cmci_irq_cd(int irq, void *dev_id)
-{
- struct s3cmci_host *host = (struct s3cmci_host *)dev_id;
-
- dbg(host, dbg_irq, "card detect\n");
-
- mmc_detect_change(host->mmc, msecs_to_jiffies(500));
-
- return IRQ_HANDLED;
-}
-
static void s3cmci_dma_done_callback(void *arg)
{
struct s3cmci_host *host = arg;
@@ -912,7 +917,7 @@ static void finalize_request(struct s3cmci_host *host)
if (s3cmci_host_usedma(host))
dmaengine_terminate_all(host->dma);

- if (host->is2440) {
+ if (host->variant->s3c2440_compatible) {
/* Clear failure register and reset fifo. */
writel(S3C2440_SDIFSTA_FIFORESET |
S3C2440_SDIFSTA_FIFOFAIL,
@@ -1025,7 +1030,7 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
dcon |= S3C2410_SDIDCON_XFER_RXSTART;
}

- if (host->is2440) {
+ if (host->variant->s3c2440_compatible) {
dcon |= S3C2440_SDIDCON_DS_WORD;
dcon |= S3C2440_SDIDCON_DATSTART;
}
@@ -1044,7 +1049,7 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)

/* write TIMER register */

- if (host->is2440) {
+ if (host->variant->s3c2440_compatible) {
writel(0x007FFFFF, host->base + S3C2410_SDITIMER);
} else {
writel(0x0000FFFF, host->base + S3C2410_SDITIMER);
@@ -1176,19 +1181,6 @@ static void s3cmci_send_request(struct mmc_host *mmc)
s3cmci_enable_irq(host, true);
}

-static int s3cmci_card_present(struct mmc_host *mmc)
-{
- struct s3cmci_host *host = mmc_priv(mmc);
- struct s3c24xx_mci_pdata *pdata = host->pdata;
- int ret;
-
- if (pdata->no_detect)
- return -ENOSYS;
-
- ret = gpio_get_value(pdata->gpio_detect) ? 0 : 1;
- return ret ^ pdata->detect_invert;
-}
-
static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct s3cmci_host *host = mmc_priv(mmc);
@@ -1197,7 +1189,7 @@ static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
host->cmd_is_stop = 0;
host->mrq = mrq;

- if (s3cmci_card_present(mmc) == 0) {
+ if (mmc_gpio_get_cd(mmc) == 0) {
dbg(host, dbg_err, "%s: no medium present\n", __func__);
host->mrq->cmd->error = -ENOMEDIUM;
mmc_request_done(mmc, mrq);
@@ -1241,22 +1233,24 @@ 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);

- if (!host->is2440)
+ if (!host->variant->s3c2440_compatible)
mci_con |= S3C2410_SDICON_FIFORESET;

break;

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)
+ if (host->variant->s3c2440_compatible)
mci_con |= S3C2440_SDICON_SDRESET;

if (host->pdata->set_power)
@@ -1294,21 +1288,6 @@ static void s3cmci_reset(struct s3cmci_host *host)
writel(con, host->base + S3C2410_SDICON);
}

-static int s3cmci_get_ro(struct mmc_host *mmc)
-{
- struct s3cmci_host *host = mmc_priv(mmc);
- struct s3c24xx_mci_pdata *pdata = host->pdata;
- int ret;
-
- if (pdata->no_wprotect)
- return 0;
-
- ret = gpio_get_value(pdata->gpio_wprotect) ? 1 : 0;
- ret ^= pdata->wprotect_invert;
-
- return ret;
-}
-
static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct s3cmci_host *host = mmc_priv(mmc);
@@ -1352,8 +1331,8 @@ static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
static struct mmc_host_ops s3cmci_ops = {
.request = s3cmci_request,
.set_ios = s3cmci_set_ios,
- .get_ro = s3cmci_get_ro,
- .get_cd = s3cmci_card_present,
+ .get_ro = mmc_gpio_get_ro,
+ .get_cd = mmc_gpio_get_cd,
.enable_sdio_irq = s3cmci_enable_sdio_irq,
};

@@ -1429,7 +1408,7 @@ static int s3cmci_state_show(struct seq_file *seq, void *v)
seq_printf(seq, "Register base = 0x%08x\n", (u32)host->base);
seq_printf(seq, "Clock rate = %ld\n", host->clk_rate);
seq_printf(seq, "Prescale = %d\n", host->prescaler);
- seq_printf(seq, "is2440 = %d\n", host->is2440);
+ seq_printf(seq, "S3C2440 compatible = %d\n", host->variant->s3c2440_compatible);
seq_printf(seq, "IRQ = %d\n", host->irq);
seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
@@ -1544,21 +1523,15 @@ 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;
+ struct mmc_host *mmc = host->mmc;
+ struct s3c24xx_mci_pdata *pdata;
+ 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->variant = (const struct s3cmci_variant_data *)
+ 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));
@@ -1568,25 +1541,103 @@ static int s3cmci_probe(struct platform_device *pdev)
for (i--; i >= S3C2410_GPE(5); i--)
gpio_free(i);

- goto probe_free_host;
+ return ret;
}
}

+ if (!pdev->dev.platform_data)
+ pdev->dev.platform_data = &s3cmci_def_pdata;
+
+ pdata = pdev->dev.platform_data;
+
+ if (pdata->no_wprotect)
+ mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
+
+ if (pdata->no_detect)
+ mmc->caps |= MMC_CAP_NEEDS_POLL;
+
+ if (pdata->wprotect_invert);
+ mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+
+ if (pdata->detect_invert)
+ mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+
+ if (gpio_is_valid(pdata->gpio_detect)) {
+ ret = mmc_gpio_request_cd(mmc, pdata->gpio_detect, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "error requesting GPIO for CD %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ if (gpio_is_valid(pdata->gpio_wprotect)) {
+ ret = mmc_gpio_request_ro(mmc, pdata->gpio_wprotect);
+ if (ret) {
+ dev_err(&pdev->dev, "error requesting GPIO for WP %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int s3cmci_probe_dt(struct s3cmci_host *host)
+{
+ struct platform_device *pdev = host->pdev;
+ struct s3c24xx_mci_pdata *pdata;
+ struct mmc_host *mmc = host->mmc;
+ int ret;
+
+ host->variant = of_device_get_match_data(&pdev->dev);
+ if (!host->variant)
+ return -ENODEV;
+
+ ret = mmc_of_parse(mmc);
+ if (ret)
+ return ret;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ 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) {
- pdev->dev.platform_data = &s3cmci_def_pdata;
- host->pdata = &s3cmci_def_pdata;
- }

spin_lock_init(&host->complete_lock);
tasklet_init(&host->pio_tasklet, pio_tasklet, (unsigned long) host);

- if (is2440) {
+ if (host->variant->s3c2440_compatible) {
host->sdiimsk = S3C2440_SDIIMSK;
host->sdidata = S3C2440_SDIDATA;
host->clk_div = 1;
@@ -1644,43 +1695,6 @@ static int s3cmci_probe(struct platform_device *pdev)
disable_irq(host->irq);
host->irq_state = false;

- if (!host->pdata->no_detect) {
- ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
- if (ret) {
- dev_err(&pdev->dev, "failed to get detect gpio\n");
- goto probe_free_irq;
- }
-
- host->irq_cd = gpio_to_irq(host->pdata->gpio_detect);
-
- if (host->irq_cd >= 0) {
- if (request_irq(host->irq_cd, s3cmci_irq_cd,
- IRQF_TRIGGER_RISING |
- IRQF_TRIGGER_FALLING,
- DRIVER_NAME, host)) {
- dev_err(&pdev->dev,
- "can't get card detect irq.\n");
- ret = -ENOENT;
- goto probe_free_gpio_cd;
- }
- } else {
- dev_warn(&pdev->dev,
- "host detect has no irq available\n");
- gpio_direction_input(host->pdata->gpio_detect);
- }
- } else
- host->irq_cd = -1;
-
- if (!host->pdata->no_wprotect) {
- ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
- if (ret) {
- dev_err(&pdev->dev, "failed to get writeprotect\n");
- goto probe_free_irq_cd;
- }
-
- gpio_direction_input(host->pdata->gpio_wprotect);
- }
-
/* Depending on the dma state, get a DMA channel to use. */

if (s3cmci_host_usedma(host)) {
@@ -1688,7 +1702,7 @@ static int s3cmci_probe(struct platform_device *pdev)
ret = PTR_ERR_OR_ZERO(host->dma);
if (ret) {
dev_err(&pdev->dev, "cannot get DMA channel.\n");
- goto probe_free_gpio_wp;
+ goto probe_free_irq;
}
}

@@ -1730,7 +1744,7 @@ static int s3cmci_probe(struct platform_device *pdev)

dbg(host, dbg_debug,
"probe: mode:%s mapped mci_base:%p irq:%u irq_cd:%u dma:%p.\n",
- (host->is2440?"2440":""),
+ (host->variant->s3c2440_compatible?"2440":""),
host->base, host->irq, host->irq_cd, host->dma);

ret = s3cmci_cpufreq_register(host);
@@ -1767,18 +1781,6 @@ static int s3cmci_probe(struct platform_device *pdev)
if (s3cmci_host_usedma(host))
dma_release_channel(host->dma);

- probe_free_gpio_wp:
- if (!host->pdata->no_wprotect)
- gpio_free(host->pdata->gpio_wprotect);
-
- probe_free_gpio_cd:
- if (!host->pdata->no_detect)
- gpio_free(host->pdata->gpio_detect);
-
- probe_free_irq_cd:
- if (host->irq_cd >= 0)
- free_irq(host->irq_cd, host);
-
probe_free_irq:
free_irq(host->irq, host);

@@ -1789,8 +1791,9 @@ 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);
@@ -1817,7 +1820,6 @@ static int s3cmci_remove(struct platform_device *pdev)
{
struct mmc_host *mmc = platform_get_drvdata(pdev);
struct s3cmci_host *host = mmc_priv(mmc);
- struct s3c24xx_mci_pdata *pd = host->pdata;
int i;

s3cmci_shutdown(pdev);
@@ -1831,15 +1833,9 @@ static int s3cmci_remove(struct platform_device *pdev)

free_irq(host->irq, host);

- if (!pd->no_wprotect)
- gpio_free(pd->gpio_wprotect);
-
- 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));
@@ -1848,16 +1844,33 @@ 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_variant_data,
+ },
+ {
+ .compatible = "samsung,s3c2412-sdi",
+ .data = &s3c2412_s3cmci_variant_data,
+ },
+ {
+ .compatible = "samsung,s3c2440-sdi",
+ .data = &s3c2440_s3cmci_variant_data,
+ },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
+
static const struct platform_device_id s3cmci_driver_ids[] = {
{
.name = "s3c2410-sdi",
- .driver_data = 0,
+ .driver_data = (kernel_ulong_t) &s3c2410_s3cmci_variant_data,
}, {
.name = "s3c2412-sdi",
- .driver_data = 1,
+ .driver_data = (kernel_ulong_t) &s3c2412_s3cmci_variant_data,
}, {
.name = "s3c2440-sdi",
- .driver_data = 1,
+ .driver_data = (kernel_ulong_t) &s3c2440_s3cmci_variant_data,
},
{ }
};
@@ -1867,6 +1880,7 @@ 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,
diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index 30c2c0dd1bc8..e9fe48915a2e 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -33,7 +33,8 @@ struct s3cmci_host {
unsigned long real_rate;
u8 prescaler;

- int is2440;
+ const struct s3cmci_variant_data *variant;
+
unsigned sdiimsk;
unsigned sdidata;

--
1.9.1