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authorStephen Warren <swarren@nvidia.com>2016-08-05 16:10:33 -0600
committerTom Warren <twarren@nvidia.com>2016-08-15 10:26:13 -0700
commitc04930762d433aeef94d8c910fa65461d43b9016 (patch)
treeaaaba6abac8bf12b304289a4cc2558f8e7c5f42d /drivers/mmc
parent34f1c9fe14172b89141254522e73ebfb6493554e (diff)
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mmc: tegra: port to standard clock/reset APIs
Tegra186 supports the new standard clock and reset APIs. Older Tegra SoCs still use custom APIs. Enhance the Tegra MMC driver so that it can operate with either set of APIs. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/tegra_mmc.c64
1 files changed, 55 insertions, 9 deletions
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index 023ba3c..f0a39a6 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -9,6 +9,7 @@
#include <bouncebuf.h>
#include <common.h>
+#include <dm/device.h>
#include <errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
@@ -20,6 +21,15 @@
#include <asm/arch-tegra/tegra_mmc.h>
#include <mmc.h>
+/*
+ * FIXME: TODO: This driver contains a number of ifdef CONFIG_TEGRA186 that
+ * should not be present. These are needed because newer Tegra SoCs support
+ * only the standard clock/reset APIs, whereas older Tegra SoCs support only
+ * a custom Tegra-specific API. ASAP the older Tegra SoCs' code should be
+ * fixed to implement the standard APIs, and all drivers converted to solely
+ * use the new standard APIs, with no ifdefs.
+ */
+
DECLARE_GLOBAL_DATA_PTR;
struct mmc_host mmc_host[CONFIG_SYS_MMC_MAX_DEVICE];
@@ -360,11 +370,14 @@ static void mmc_change_clock(struct mmc_host *host, uint clock)
*/
if (clock == 0)
goto out;
-#ifndef CONFIG_TEGRA186
+#ifdef CONFIG_TEGRA186
+ {
+ ulong rate = clk_set_rate(&host->clk, clock);
+ div = (rate + clock - 1) / clock;
+ }
+#else
clock_adjust_periph_pll_div(host->mmc_id, CLOCK_ID_PERIPH, clock,
&div);
-#else
- div = (20000000 + clock - 1) / clock;
#endif
debug("div = %d\n", div);
@@ -539,6 +552,9 @@ static int do_mmc_init(int dev_index, bool removable)
{
struct mmc_host *host;
struct mmc *mmc;
+#ifdef CONFIG_TEGRA186
+ int ret;
+#endif
/* DT should have been read & host config filled in */
host = &mmc_host[dev_index];
@@ -550,7 +566,21 @@ static int do_mmc_init(int dev_index, bool removable)
gpio_get_number(&host->cd_gpio));
host->clock = 0;
-#ifndef CONFIG_TEGRA186
+
+#ifdef CONFIG_TEGRA186
+ ret = reset_assert(&host->reset_ctl);
+ if (ret)
+ return ret;
+ ret = clk_enable(&host->clk);
+ if (ret)
+ return ret;
+ ret = clk_set_rate(&host->clk, 20000000);
+ if (IS_ERR_VALUE(ret))
+ return ret;
+ ret = reset_deassert(&host->reset_ctl);
+ if (ret)
+ return ret;
+#else
clock_start_periph_pll(host->mmc_id, CLOCK_ID_PERIPH, 20000000);
#endif
@@ -577,11 +607,7 @@ static int do_mmc_init(int dev_index, bool removable)
* (actually 52MHz)
*/
host->cfg.f_min = 375000;
-#ifndef CONFIG_TEGRA186
host->cfg.f_max = 48000000;
-#else
- host->cfg.f_max = 375000;
-#endif
host->cfg.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
@@ -613,7 +639,27 @@ static int mmc_get_config(const void *blob, int node, struct mmc_host *host,
return -FDT_ERR_NOTFOUND;
}
-#ifndef CONFIG_TEGRA186
+#ifdef CONFIG_TEGRA186
+ {
+ /*
+ * FIXME: This variable should go away when the MMC device
+ * actually is a udevice.
+ */
+ struct udevice dev;
+ int ret;
+ dev.of_offset = node;
+ ret = reset_get_by_name(&dev, "sdmmc", &host->reset_ctl);
+ if (ret) {
+ debug("reset_get_by_index() failed: %d\n", ret);
+ return ret;
+ }
+ ret = clk_get_by_name(&dev, "sdmmc", &host->clk);
+ if (ret) {
+ debug("clk_get_by_index() failed: %d\n", ret);
+ return ret;
+ }
+ }
+#else
host->mmc_id = clock_decode_periph_id(blob, node);
if (host->mmc_id == PERIPH_ID_NONE) {
debug("%s: could not decode periph id\n", __func__);