On 02/24/2012 06:53 PM, Thomas Abraham wrote:
> Dear Mr. Chung,
>
> This has been in the todo list for a long time. Thanks for the patch.
> With the use of device tree and sdhci-pltfm driver, it should be
> possible to avoid dependency with platform code.
I'm working for using sdhci-pltfm. And in mmc-next tree, latest your patch is merged.
(using device-tree). So i rework this patch.
Right. this is the todo list. And need more discussion.
Main goal is to use the sdhci-pltfm.
>
> There are few comments below.
>
> On 14 February 2012 10:33, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote:
>> This patch is change to use the sdhci-pltfm.c
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
>> signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>> ---
>> drivers/mmc/host/sdhci-s3c.c | 218 ++++++++++++++----------------------------
>> 1 files changed, 71 insertions(+), 147 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
>> index 1af756e..a651c1e 100644
>> --- a/drivers/mmc/host/sdhci-s3c.c
>> +++ b/drivers/mmc/host/sdhci-s3c.c
>> @@ -26,6 +26,7 @@
>> #include <plat/sdhci.h>
>> #include <plat/regs-sdhci.h>
>>
>> +#include "sdhci-pltfm.h"
>> #include "sdhci.h"
>>
>> #define MAX_BUS_CLK (4)
>> @@ -41,9 +42,7 @@
>> * @clk_bus: The clocks that are available for the SD/MMC bus clock.
>> */
>> struct sdhci_s3c {
>> - struct sdhci_host *host;
>> struct platform_device *pdev;
>> - struct resource *ioarea;
>> struct s3c_sdhci_platdata *pdata;
>> unsigned int cur_clk;
>
> Would it be possible to remove cur_clk and only use pltfm_host->clk ?
Good point, cur_clk can be removed.
>
>> int ext_cd_irq;
>> @@ -53,11 +52,6 @@ struct sdhci_s3c {
>> struct clk *clk_bus[MAX_BUS_CLK];
>> };
>>
>> -static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
>> -{
>> - return sdhci_priv(host);
>> -}
>> -
>> /**
>> * get_curclk - convert ctrl2 register to clock source number
>> * @ctrl2: Control2 register value.
>> @@ -72,7 +66,8 @@ static u32 get_curclk(u32 ctrl2)
>>
>> static void sdhci_s3c_check_sclk(struct sdhci_host *host)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_s3c *ourhost = pltfm_host->priv;
>> u32 tmp = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
>>
>> if (get_curclk(tmp) != ourhost->cur_clk) {
>> @@ -92,13 +87,13 @@ static void sdhci_s3c_check_sclk(struct sdhci_host *host)
>> */
>> static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_s3c *ourhost = pltfm_host->priv;
>> struct clk *busclk;
>> unsigned int rate, max;
>> int clk;
>>
>> /* note, a reset will reset the clock source */
>> -
>> sdhci_s3c_check_sclk(host);
>>
>> for (max = 0, clk = 0; clk < MAX_BUS_CLK; clk++) {
>> @@ -163,7 +158,8 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
>> */
>> static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_s3c *ourhost = pltfm_host->priv;
>> unsigned int best = UINT_MAX;
>> unsigned int delta;
>> int best_src = 0;
>> @@ -233,7 +229,8 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
>> */
>> static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_s3c *ourhost = pltfm_host->priv;
>> unsigned int delta, min = UINT_MAX;
>> int src;
>>
>> @@ -251,27 +248,27 @@ static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
>> /* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
>> static unsigned int sdhci_cmu_get_max_clock(struct sdhci_host *host)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>>
>> - return clk_round_rate(ourhost->clk_bus[ourhost->cur_clk], UINT_MAX);
>> + return clk_round_rate(pltfm_host->clk, UINT_MAX);
>> }
>>
>> /* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
>> static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>>
>> /*
>> * initial clock can be in the frequency range of
>> * 100KHz-400KHz, so we set it as max value.
>> */
>> - return clk_round_rate(ourhost->clk_bus[ourhost->cur_clk], 400000);
>> + return clk_round_rate(pltfm_host->clk, 400000);
>> }
>>
>> /* sdhci_cmu_set_clock - callback on clock change.*/
>> static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
>> {
>> - struct sdhci_s3c *ourhost = to_s3c(host);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>>
>> /* don't bother if the clock is going off */
>> if (clock == 0)
>> @@ -279,7 +276,7 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
>>
>> sdhci_s3c_set_clock(host, clock);
>>
>> - clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
>> + clk_set_rate(pltfm_host->clk, clock);
>>
>> host->clock = clock;
>> }
>> @@ -382,52 +379,50 @@ static void sdhci_s3c_setup_card_detect_gpio(struct sdhci_s3c *sc)
>> }
>> }
>>
>> +static struct sdhci_pltfm_data sdhci_s3c_pdata = {
>> + .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
>> + SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_NO_BUSY_IRQ |
>> + SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 |
>> + SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
>> + SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
>> + SDHCI_QUIRK_32BIT_DMA_ADDR | SDHCI_QUIRK_32BIT_DMA_SIZE,
>> + .ops = &sdhci_s3c_ops,
>> +};
>> +
>> static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>> {
>> struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data;
>> struct device *dev = &pdev->dev;
>> + struct sdhci_pltfm_host *pltfm_host;
>> + struct sdhci_pltfm_data *pltfm_pdata = &sdhci_s3c_pdata;
>> struct sdhci_host *host;
>> struct sdhci_s3c *sc;
>> - struct resource *res;
>> - int ret, irq, ptr, clks;
>> -
>> - if (!pdata) {
>> - dev_err(dev, "no device data specified\n");
>> - return -ENOENT;
>> - }
>> + int ret, ptr, clks;
>>
>> - irq = platform_get_irq(pdev, 0);
>> - if (irq < 0) {
>> - dev_err(dev, "no irq specified\n");
>> - return irq;
>> - }
>> -
>> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> - if (!res) {
>> - dev_err(dev, "no memory specified\n");
>> - return -ENOENT;
>> - }
>> -
>> - host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
>> + host = sdhci_pltfm_init(pdev, pltfm_pdata);
>> if (IS_ERR(host)) {
>> dev_err(dev, "sdhci_alloc_host() failed\n");
>> return PTR_ERR(host);
>> }
>>
>> - sc = sdhci_priv(host);
>> + sc = kzalloc(sizeof(struct sdhci_s3c), GFP_KERNEL);
>> + if (!sc) {
>> + ret = -ENOMEM;
>> + goto err_alloc_host;
>> + }
>> +
>> + pltfm_host = sdhci_priv(host);
>> + pltfm_host->priv = sc;
>>
>> - sc->host = host;
>> sc->pdev = pdev;
>> - sc->pdata = pdata;
>> + sc->pdata = pdev->dev.platform_data;
>> sc->ext_cd_gpio = -1; /* invalid gpio number */
>>
>> - platform_set_drvdata(pdev, host);
>> -
>> sc->clk_io = clk_get(dev, "hsmmc");
>> if (IS_ERR(sc->clk_io)) {
>> dev_err(dev, "failed to get io clock\n");
>> ret = PTR_ERR(sc->clk_io);
>> - goto err_io_clk;
>> + goto err_alloc_host;
>> }
>>
>> /* enable the local io clock and keep it running for the moment. */
>> @@ -439,9 +434,8 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>>
>> snprintf(name, 14, "mmc_busclk.%d", ptr);
>> clk = clk_get(dev, name);
>> - if (IS_ERR(clk)) {
>> + if (IS_ERR(clk))
>> continue;
>> - }
>>
>> clks++;
>> sc->clk_bus[ptr] = clk;
>> @@ -450,7 +444,7 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>> * save current clock index to know which clock bus
>> * is used later in overriding functions.
>> */
>> - sc->cur_clk = ptr;
>> + pltfm_host->clk = clk;
>
> The sc->cur_clk and pltfm_host->clk are being used interchangeably
> here. It would be better to use pltfm_host->clk and remove clk_clk
> member from driver private data.
Right.
>
>>
>> clk_enable(clk);
>>
>> @@ -464,53 +458,17 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>> goto err_no_busclks;
>> }
>>
>> - sc->ioarea = request_mem_region(res->start, resource_size(res),
>> - mmc_hostname(host->mmc));
>> - if (!sc->ioarea) {
>> - dev_err(dev, "failed to reserve register area\n");
>> - ret = -ENXIO;
>> - goto err_req_regs;
>> - }
>> -
>> - host->ioaddr = ioremap_nocache(res->start, resource_size(res));
>> - if (!host->ioaddr) {
>> - dev_err(dev, "failed to map registers\n");
>> - ret = -ENXIO;
>> - goto err_req_regs;
>> - }
>> -
>> /* Ensure we have minimal gpio selected CMD/CLK/Detect */
>> - if (pdata->cfg_gpio)
>> - pdata->cfg_gpio(pdev, pdata->max_width);
>> -
>> - host->hw_name = "samsung-hsmmc";
>> - host->ops = &sdhci_s3c_ops;
>> - host->quirks = 0;
>> - host->irq = irq;
>> -
>> - /* Setup quirks for the controller */
>> - host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
>> - host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
>> + if (sc->pdata->cfg_gpio)
>> + sc->pdata->cfg_gpio(pdev, sc->pdata->max_width);
>>
>> #ifndef CONFIG_MMC_SDHCI_S3C_DMA
>> -
>> /* we currently see overruns on errors, so disable the SDMA
>> * support as well. */
>> host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
>>
>> #endif /* CONFIG_MMC_SDHCI_S3C_DMA */
>>
>> - /* It seems we do not get an DATA transfer complete on non-busy
>> - * transfers, not sure if this is a problem with this specific
>> - * SDHCI block, or a missing configuration that needs to be set. */
>> - host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;
>> -
>> - /* This host supports the Auto CMD12 */
>> - host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
>> -
>> - /* Samsung SoCs need BROKEN_ADMA_ZEROLEN_DESC */
>> - host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;
>> -
>> if (pdata->cd_type == S3C_SDHCI_CD_NONE ||
>> pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
>> host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
>> @@ -518,17 +476,14 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>> if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
>> host->mmc->caps = MMC_CAP_NONREMOVABLE;
>>
>> + /* It supports additional host capabilities if needed */
>> if (pdata->host_caps)
>> - host->mmc->caps |= pdata->host_caps;
>> -
>> - if (pdata->pm_caps)
>> - host->mmc->pm_caps |= pdata->pm_caps;
>> + host->mmc->caps |= sc->pdata->host_caps;
>>
>> - host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
>> - SDHCI_QUIRK_32BIT_DMA_SIZE);
>> + host->mmc->caps2 |= MMC_CAP2_BROKEN_VOLTAGE;
>>
>> - /* HSMMC on Samsung SoCs uses SDCLK as timeout clock */
>> - host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;
>> + if (pdata->pm_caps)
>> + host->mmc->pm_caps |= sc->pdata->pm_caps;
>>
>> /*
>> * If controller does not have internal clock divider,
>> @@ -540,10 +495,6 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>> sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
>> }
>>
>> - /* It supports additional host capabilities if needed */
>> - if (pdata->host_caps)
>> - host->mmc->caps |= pdata->host_caps;
>> -
>> ret = sdhci_add_host(host);
>> if (ret) {
>> dev_err(dev, "sdhci_add_host() failed\n");
>> @@ -561,24 +512,21 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
>>
>> return 0;
>>
>> - err_add_host:
>> - release_resource(sc->ioarea);
>> - kfree(sc->ioarea);
>> -
>> - err_req_regs:
>> +err_add_host:
>> for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
>> if (sc->clk_bus[ptr]) {
>> clk_disable(sc->clk_bus[ptr]);
>> clk_put(sc->clk_bus[ptr]);
>> }
>> }
>> -
>> - err_no_busclks:
>> +err_no_busclks:
>> clk_disable(sc->clk_io);
>> clk_put(sc->clk_io);
>>
>> - err_io_clk:
>> - sdhci_free_host(host);
>> + kfree(sc);
>> +err_alloc_host:
>> + sdhci_pltfm_free(pdev);
>> + dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
>>
>> return ret;
>> }
>> @@ -587,8 +535,9 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
>> {
>> struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data;
>> struct sdhci_host *host = platform_get_drvdata(pdev);
>> - struct sdhci_s3c *sc = sdhci_priv(host);
>> - int ptr;
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_s3c *sc = pltfm_host->priv;
>> + int ptr, ret;
>>
>> if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_cleanup)
>> pdata->ext_cd_cleanup(&sdhci_s3c_notify_change);
>> @@ -599,9 +548,9 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
>> if (gpio_is_valid(sc->ext_cd_gpio))
>> gpio_free(sc->ext_cd_gpio);
>>
>> - sdhci_remove_host(host, 1);
>> + ret = sdhci_pltfm_unregister(pdev);
>>
>> - for (ptr = 0; ptr < 3; ptr++) {
>> + for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
>> if (sc->clk_bus[ptr]) {
>> clk_disable(sc->clk_bus[ptr]);
>> clk_put(sc->clk_bus[ptr]);
>> @@ -610,54 +559,29 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
>> clk_disable(sc->clk_io);
>> clk_put(sc->clk_io);
>>
>> - iounmap(host->ioaddr);
>> - release_resource(sc->ioarea);
>> - kfree(sc->ioarea);
>> -
>> - sdhci_free_host(host);
>> - platform_set_drvdata(pdev, NULL);
>> -
>> - return 0;
>> -}
>> -
>> -#ifdef CONFIG_PM
>> -
>> -static int sdhci_s3c_suspend(struct device *dev)
>> -{
>> - struct sdhci_host *host = dev_get_drvdata(dev);
>> -
>> - return sdhci_suspend_host(host);
>> -}
>> -
>> -static int sdhci_s3c_resume(struct device *dev)
>> -{
>> - struct sdhci_host *host = dev_get_drvdata(dev);
>> -
>> - return sdhci_resume_host(host);
>> + return ret;
>> }
>>
>> -static const struct dev_pm_ops sdhci_s3c_pmops = {
>> - .suspend = sdhci_s3c_suspend,
>> - .resume = sdhci_s3c_resume,
>> -};
>> -
>> -#define SDHCI_S3C_PMOPS (&sdhci_s3c_pmops)
>> -
>> -#else
>> -#define SDHCI_S3C_PMOPS NULL
>> -#endif
>> -
>> static struct platform_driver sdhci_s3c_driver = {
>> .probe = sdhci_s3c_probe,
>> .remove = __devexit_p(sdhci_s3c_remove),
>> .driver = {
>> .owner = THIS_MODULE,
>> .name = "s3c-sdhci",
>> - .pm = SDHCI_S3C_PMOPS,
>
> The SDHCI_PLTFM_PMOPS could be used here since the s3c specific ops
> have been removed.
Right...I will fix.
>
>> },
>> };
>>
>> -module_platform_driver(sdhci_s3c_driver);
>> +static int __init sdhci_s3c_init(void)
>> +{
>> + return platform_driver_register(&sdhci_s3c_driver);
>> +}
>> +module_init(sdhci_s3c_init);
>> +
>> +static void __exit sdhci_s3c_exit(void)
>> +{
>> + platform_driver_unregister(&sdhci_s3c_driver);
>> +}
>> +module_exit(sdhci_s3c_exit);
>
> Any reason to expand this into a boilerplate again?
It's my mis-understanding. there is no reason.
Best Regards,
Jaehoon Chung
>
>>
>> MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
>> MODULE_AUTHOR("Ben Dooks, <ben@xxxxxxxxxxxx>");
>
> Thanks,
> Thomas.
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