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

From: Ulf Hansson
Date: Thu Jan 19 2017 - 06:11:24 EST

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On 13 January 2017 at 16:05, Sergio Prado <sergio.prado@xxxxxxxxxxxxxx> wrote:
> Allows configuring Samsung S3C24XX MMC/SD/SDIO controller using a device
> tree.
>
> Signed-off-by: Sergio Prado <sergio.prado@xxxxxxxxxxxxxx>

Looks good to me. Waiting for Rob's ack for the DT changes in patch1
(needed a re-spin) before I queue it.

Kind regards
Uffe

> ---
> 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
>

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