[U-Boot] [PATCH v9] mmc: atmel_sdhci: Convert to the driver model support

Wenyou Yang
2016-07-29T00:40:46Z

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@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
---

Changes in v9:
- Add Reviewed-by tag.

Changes in v8:
- Make atmel_sdhci_get_clk() to get clock device.
- Use ulong type for gck_rate.
- Remove meaningless type casting before dev->name.

Changes in v7:
- Add support for using driver model for block devices and MMC operations.
- Change clk_client.h -> clk.h to adapt to clk API conversion.

Changes in v6:
- Remove unnecessary white space.
- Use sdhci_read(), instead of readl().
- Remove the local variables min_clk.

Changes in v5:
- Add Reviewed-by tag.

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 | 127 ++++++++++++++++++++++++++++++++++++++++++++++
include/sdhci.h | 2 +
3 files changed, 139 insertions(+)

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 79cf18f..49b325e 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -34,6 +34,16 @@ 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 && BLK && DM_MMC_OPS && 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..8a4f347 100644
--- a/drivers/mmc/atmel_sdhci.c
+++ b/drivers/mmc/atmel_sdhci.c
@@ -6,12 +6,15 @@
*/

#include <common.h>
+#include <clk.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 +41,127 @@ int atmel_sdhci_init(void *regbase, u32 id)

return 0;
}
+
+#else
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct atmel_sdhci_plat {
+ struct mmc_config cfg;
+ struct mmc mmc;
+};
+
+static int atmel_sdhci_get_clk(struct udevice *dev, int index, struct clk *clk)
+{
+ struct udevice *dev_clk;
+ int periph, ret;
+
+ ret = clk_get_by_index(dev, index, 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;
+
+ return 0;
+}
+
+static int atmel_sdhci_probe(struct udevice *dev)
+{
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+ struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
+ struct sdhci_host *host = dev_get_priv(dev);
+ u32 max_clk;
+ u32 caps, caps_1;
+ u32 clk_base, clk_mul;
+ ulong gck_rate;
+ struct clk clk;
+ int ret;
+
+ ret = atmel_sdhci_get_clk(dev, 0, &clk);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(&clk);
+ if (ret)
+ return ret;
+
+ host->name = 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);
+
+ caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+ clk_base = (caps & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
+ caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
+ clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
+ gck_rate = clk_base * 1000000 * (clk_mul + 1);
+
+ ret = atmel_sdhci_get_clk(dev, 1, &clk);
+ if (ret)
+ return ret;
+
+ ret = clk_set_rate(&clk, gck_rate);
+ if (ret)
+ return ret;
+
+ max_clk = clk_get_rate(&clk);
+ if (!max_clk)
+ return -EINVAL;
+
+ ret = sdhci_setup_cfg(&plat->cfg, dev->name, host->bus_width,
+ caps, max_clk, ATMEL_SDHC_MIN_FREQ,
+ host->version, host->quirks, 0);
+ if (ret)
+ return ret;
+
+ host->mmc = &plat->mmc;
+ host->mmc->dev = dev;
+ host->mmc->priv = host;
+ upriv->mmc = host->mmc;
+
+ clk_free(&clk);
+
+ return sdhci_probe(dev);
+}
+
+static int atmel_sdhci_bind(struct udevice *dev)
+{
+ struct atmel_sdhci_plat *plat = dev_get_platdata(dev);
+ int ret;
+
+ ret = sdhci_bind(dev, &plat->mmc, &plat->cfg);
+ if (ret)
+ return ret;
+
+ 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,
+ .ops = &sdhci_ops,
+ .bind = atmel_sdhci_bind,
+ .probe = atmel_sdhci_probe,
+ .priv_auto_alloc_size = sizeof(struct sdhci_host),
+ .platdata_auto_alloc_size = sizeof(struct atmel_sdhci_plat),
+};
+#endif
diff --git a/include/sdhci.h b/include/sdhci.h
index c4d3b55..fdc0032 100644
--- a/include/sdhci.h
+++ b/include/sdhci.h
@@ -166,6 +166,8 @@
#define SDHCI_CAN_64BIT 0x10000000

#define SDHCI_CAPABILITIES_1 0x44
+#define SDHCI_CLOCK_MUL_MASK 0x00FF0000
+#define SDHCI_CLOCK_MUL_SHIFT 16

#define SDHCI_MAX_CURRENT 0x48

--
2.7.4