[U-Boot] [PATCH v4] mmc: atmel_sdhci: Convert to the driver model support

[Wenyou Yang]

Convert the driver to the driver model while retaining the existing
legacy code. This allows the driver to support boards that have
converted to driver model as well as those that have not.

Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
---

Changes in v4:
 - Update the clk API based on [PATCH] clk: convert API to match
   reset/mailbox fstyle (http://patchwork.ozlabs.org/patch/625342/).
 - Remove check on dev_get_parent() return.
 - Fixed the return value, such as -ENODEV->-EINVAL.

Changes in v3:
 - Remove the redundant log print.

Changes in v2:
 - Add clock support, include enabling peripheral clock and
   generated clock.
 - Retain the existing legacy code to support boards which have not
   converted to driver model.

 drivers/mmc/Kconfig       | 10 +++++
 drivers/mmc/atmel_sdhci.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index c80efc3..518c624 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -25,6 +25,16 @@ config MSM_SDHCI
           SD 3.0 specifications. Both SD and eMMC devices are supported.
 	  Card-detect gpios are not supported.
 
+config ATMEL_SDHCI
+	bool "Atmel SDHCI controller support"
+	depends on DM_MMC && ARCH_AT91
+	help
+	  This enables support for the Atmel SDHCI controller, which supports
+	  the embedded MultiMedia Card (e.MMC) Specification V4.51, the SD
+	  Memory Card Specification V3.0, and the SDIO V3.0 specification.
+	  It is compliant with the SD Host Controller Standard V3.0
+	  specification.
+
 config ROCKCHIP_DWMMC
 	bool "Rockchip SD/MMC controller support"
 	depends on DM_MMC && OF_CONTROL
diff --git a/drivers/mmc/atmel_sdhci.c b/drivers/mmc/atmel_sdhci.c
index 24b68b6..a68d192 100644
--- a/drivers/mmc/atmel_sdhci.c
+++ b/drivers/mmc/atmel_sdhci.c
@@ -6,12 +6,16 @@
  */
 
 #include <common.h>
+#include <clk_client.h>
+#include <dm.h>
 #include <malloc.h>
 #include <sdhci.h>
 #include <asm/arch/clk.h>
 
 #define ATMEL_SDHC_MIN_FREQ	400000
 
+#ifndef CONFIG_DM_MMC
+
 int atmel_sdhci_init(void *regbase, u32 id)
 {
 	struct sdhci_host *host;
@@ -38,3 +42,98 @@ int atmel_sdhci_init(void *regbase, u32 id)
 
 	return 0;
 }
+
+#else
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int atmel_sdhci_probe(struct udevice *dev)
+{
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+	struct sdhci_host *host = dev_get_priv(dev);
+	u32 max_clk, min_clk = ATMEL_SDHC_MIN_FREQ;
+	u32 caps0, caps1;
+	u32 clk_base, clk_mul;
+	u32 gck_rate;
+	struct udevice *dev_clk;
+	struct clk clk;
+	int periph, ret;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return ret;
+
+	periph = fdtdec_get_uint(gd->fdt_blob, clk.dev->of_offset, "reg", -1);
+	if (periph < 0)
+		return -EINVAL;
+
+	dev_clk = dev_get_parent(clk.dev);
+	ret = clk_request(dev_clk, &clk);
+	if (ret)
+		return ret;
+
+	clk.id = periph;
+	ret = clk_enable(&clk);
+	if (ret)
+		return ret;
+
+	host->name = (char *)dev->name;
+	host->ioaddr = (void *)dev_get_addr(dev);
+
+	host->quirks = 0;
+	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
+
+	host->bus_width	= fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					 "bus-width", 4);
+
+	caps0 = readl(host->ioaddr + SDHCI_CAPABILITIES);
+	caps1 = readl(host->ioaddr + SDHCI_CAPABILITIES_1);
+	clk_base = (caps0 & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
+	clk_mul = (caps1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
+	gck_rate = clk_base * 1000000 * (clk_mul + 1);
+
+	ret = clk_get_by_index(dev, 1, &clk);
+	if (ret)
+		return ret;
+
+	periph = fdtdec_get_uint(gd->fdt_blob, clk.dev->of_offset, "reg", -1);
+	if (periph < 0)
+		return -EINVAL;
+
+	dev_clk = dev_get_parent(clk.dev);
+	ret = clk_request(dev_clk, &clk);
+	if (ret)
+		return ret;
+
+	clk.id = periph;
+	ret = clk_set_rate(&clk, gck_rate);
+	if (ret)
+		return ret;
+
+	max_clk = clk_get_rate(&clk);
+	if (!max_clk)
+		return -EINVAL;
+
+	add_sdhci(host, max_clk, min_clk);
+
+	upriv->mmc = host->mmc;
+
+	clk_free(&clk);
+
+	return 0;
+}
+
+static const struct udevice_id atmel_sdhci_ids[] = {
+	{ .compatible = "atmel,sama5d2-sdhci" },
+	{ }
+};
+
+U_BOOT_DRIVER(atmel_sdhci_drv) = {
+	.name		= "atmel_sdhci",
+	.id		= UCLASS_MMC,
+	.of_match	= atmel_sdhci_ids,
+	.probe		= atmel_sdhci_probe,
+	.priv_auto_alloc_size = sizeof(struct sdhci_host),
+};
+
+#endif
-- 
2.7.4