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Subject[PATCH 1/5] mmc: sdhci: make sdhci-esdhc-imx driver self registered
Date
The patch turns the common stuff to in sdhci-pltfm.c into functions,
and add sdhci-esdhc-imx its own .probe and .remove which in turn call
into the common functions, so that sdhci-esdhc-imx driver registers
itself and keep all sdhci-esdhc-imx specific things like
sdhci_esdhc_imx_pdata away from sdhci-pltfm.c which is common.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
drivers/mmc/host/sdhci-esdhc-imx.c | 98 +++++++++++++++++++++++++++++-------
drivers/mmc/host/sdhci-pltfm.c | 84 +++++++++++++++++++++++++++++--
drivers/mmc/host/sdhci-pltfm.h | 11 ++++-
3 files changed, 169 insertions(+), 24 deletions(-)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 9b82910..6585620 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -100,15 +100,39 @@ static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
return clk_get_rate(pltfm_host->clk) / 256 / 16;
}

-static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata)
+static struct sdhci_ops sdhci_esdhc_ops = {
+ .read_w = esdhc_readw_le,
+ .write_w = esdhc_writew_le,
+ .write_b = esdhc_writeb_le,
+ .set_clock = esdhc_set_clock,
+ .get_max_clock = esdhc_pltfm_get_max_clock,
+ .get_min_clock = esdhc_pltfm_get_min_clock,
+};
+
+static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
+ .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_ADMA,
+ /* ADMA has issues. Might be fixable */
+ .ops = &sdhci_esdhc_ops,
+};
+
+static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
{
- struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_host *host;
struct clk *clk;
+ int ret;
+
+ host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata);
+ if (!host)
+ return -ENOMEM;
+
+ pltfm_host = sdhci_priv(host);

clk = clk_get(mmc_dev(host->mmc), NULL);
if (IS_ERR(clk)) {
dev_err(mmc_dev(host->mmc), "clk err\n");
- return PTR_ERR(clk);
+ ret = PTR_ERR(clk);
+ goto err_clk_get;
}
clk_enable(clk);
pltfm_host->clk = clk;
@@ -120,30 +144,68 @@ static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pd
if (cpu_is_mx25() || cpu_is_mx35())
host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK;

+ ret = sdhci_add_host(host);
+ if (ret)
+ goto err_add_host;
+
return 0;
+
+err_add_host:
+ clk_disable(pltfm_host->clk);
+ clk_put(pltfm_host->clk);
+err_clk_get:
+ sdhci_pltfm_free(pdev);
+ return ret;
}

-static void esdhc_pltfm_exit(struct sdhci_host *host)
+static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev)
{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ int dead = 0;
+ u32 scratch;
+
+ dead = 0;
+ scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+ if (scratch == (u32)-1)
+ dead = 1;
+
+ sdhci_remove_host(host, dead);

clk_disable(pltfm_host->clk);
clk_put(pltfm_host->clk);
+
+ sdhci_pltfm_free(pdev);
+
+ return 0;
}

-static struct sdhci_ops sdhci_esdhc_ops = {
- .read_w = esdhc_readw_le,
- .write_w = esdhc_writew_le,
- .write_b = esdhc_writeb_le,
- .set_clock = esdhc_set_clock,
- .get_max_clock = esdhc_pltfm_get_max_clock,
- .get_min_clock = esdhc_pltfm_get_min_clock,
+static struct platform_driver sdhci_esdhc_imx_driver = {
+ .driver = {
+ .name = "sdhci-esdhc-imx",
+ .owner = THIS_MODULE,
+ },
+ .probe = sdhci_esdhc_imx_probe,
+ .remove = __devexit_p(sdhci_esdhc_imx_remove),
+#ifdef CONFIG_PM
+ .suspend = sdhci_pltfm_suspend,
+ .resume = sdhci_pltfm_resume,
+#endif
};

-struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
- .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_ADMA,
- /* ADMA has issues. Might be fixable */
- .ops = &sdhci_esdhc_ops,
- .init = esdhc_pltfm_init,
- .exit = esdhc_pltfm_exit,
-};
+static int __init sdhci_esdhc_imx_init(void)
+{
+ return platform_driver_register(&sdhci_esdhc_imx_driver);
+}
+
+static void __exit sdhci_esdhc_imx_exit(void)
+{
+ platform_driver_unregister(&sdhci_esdhc_imx_driver);
+}
+
+module_init(sdhci_esdhc_imx_init);
+module_exit(sdhci_esdhc_imx_exit);
+
+MODULE_DESCRIPTION("SDHCI driver for i.MX eSDHC");
+MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
index ccc04ac..38b8cb4 100644
--- a/drivers/mmc/host/sdhci-pltfm.c
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -44,6 +44,83 @@
static struct sdhci_ops sdhci_pltfm_ops = {
};

+struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
+ struct sdhci_pltfm_data *pdata)
+{
+ struct sdhci_host *host;
+ struct sdhci_pltfm_host *pltfm_host;
+ struct resource *iomem;
+ int ret;
+
+ iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iomem) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ if (resource_size(iomem) < 0x100)
+ dev_err(&pdev->dev, "Invalid iomem size!\n");
+
+ /* Some PCI-based MFD need the parent here */
+ if (pdev->dev.parent != &platform_bus)
+ host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
+ else
+ host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
+
+ if (IS_ERR(host)) {
+ ret = PTR_ERR(host);
+ goto err;
+ }
+
+ pltfm_host = sdhci_priv(host);
+
+ host->hw_name = "SDHCI";
+ if (pdata && pdata->ops)
+ host->ops = pdata->ops;
+ else
+ host->ops = &sdhci_pltfm_ops;
+ if (pdata)
+ host->quirks = pdata->quirks;
+ host->irq = platform_get_irq(pdev, 0);
+
+ if (!request_mem_region(iomem->start, resource_size(iomem),
+ mmc_hostname(host->mmc))) {
+ dev_err(&pdev->dev, "cannot request region\n");
+ ret = -EBUSY;
+ goto err_request;
+ }
+
+ host->ioaddr = ioremap(iomem->start, resource_size(iomem));
+ if (!host->ioaddr) {
+ dev_err(&pdev->dev, "failed to remap registers\n");
+ ret = -ENOMEM;
+ goto err_remap;
+ }
+
+ platform_set_drvdata(pdev, host);
+
+ return host;
+
+err_remap:
+ release_mem_region(iomem->start, resource_size(iomem));
+err_request:
+ sdhci_free_host(host);
+err:
+ pr_err("%s failed %d\n", __func__, ret);
+ return NULL;
+}
+
+void sdhci_pltfm_free(struct platform_device *pdev)
+{
+ struct sdhci_host *host = platform_get_drvdata(pdev);
+ struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ iounmap(host->ioaddr);
+ release_mem_region(iomem->start, resource_size(iomem));
+ sdhci_free_host(host);
+ platform_set_drvdata(pdev, NULL);
+}
+
/*****************************************************************************\
* *
* Device probing/removal *
@@ -198,9 +275,6 @@ static const struct platform_device_id sdhci_pltfm_ids[] = {
#ifdef CONFIG_MMC_SDHCI_CNS3XXX
{ "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
#endif
-#ifdef CONFIG_MMC_SDHCI_ESDHC_IMX
- { "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata },
-#endif
#ifdef CONFIG_MMC_SDHCI_DOVE
{ "sdhci-dove", (kernel_ulong_t)&sdhci_dove_pdata },
#endif
@@ -212,14 +286,14 @@ static const struct platform_device_id sdhci_pltfm_ids[] = {
MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);

#ifdef CONFIG_PM
-static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
+int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
{
struct sdhci_host *host = platform_get_drvdata(dev);

return sdhci_suspend_host(host, state);
}

-static int sdhci_pltfm_resume(struct platform_device *dev)
+int sdhci_pltfm_resume(struct platform_device *dev)
{
struct sdhci_host *host = platform_get_drvdata(dev);

diff --git a/drivers/mmc/host/sdhci-pltfm.h b/drivers/mmc/host/sdhci-pltfm.h
index c67523d..8357eba 100644
--- a/drivers/mmc/host/sdhci-pltfm.h
+++ b/drivers/mmc/host/sdhci-pltfm.h
@@ -13,6 +13,7 @@

#include <linux/clk.h>
#include <linux/types.h>
+#include <linux/platform_device.h>
#include <linux/mmc/sdhci-pltfm.h>

struct sdhci_pltfm_host {
@@ -21,9 +22,17 @@ struct sdhci_pltfm_host {
};

extern struct sdhci_pltfm_data sdhci_cns3xxx_pdata;
-extern struct sdhci_pltfm_data sdhci_esdhc_imx_pdata;
extern struct sdhci_pltfm_data sdhci_dove_pdata;
extern struct sdhci_pltfm_data sdhci_tegra_pdata;
extern struct sdhci_pltfm_data sdhci_tegra_dt_pdata;

+struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
+ struct sdhci_pltfm_data *pdata);
+void sdhci_pltfm_free(struct platform_device *pdev);
+
+#ifdef CONFIG_PM
+int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state);
+int sdhci_pltfm_resume(struct platform_device *dev);
+#endif
+
#endif /* _DRIVERS_MMC_SDHCI_PLTFM_H */
--
1.7.1


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