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authorStephen Warren <swarren@nvidia.com>2016-05-12 12:11:23 -0600
committerTom Warren <twarren@nvidia.com>2016-05-31 11:22:59 -0700
commit39f633320c569a5d975d2d051ff2683db27bd021 (patch)
tree675be1ed00fe4a4e47c851da627b15681e2cda05
parent074a1fdd27953aacb59346c83baaf443335ea04e (diff)
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mmc: tegra: add basic Tegra186 support
Tegra186's MMC controller needs to be explicitly identified. Add another compatible value for it. Tegra186 will use an entirely different clock/reset control mechanism to existing chips, and will use standard clock/reset APIs rather than the existing Tegra-specific custom APIs. The driver support for that isn't ready yet, so simply disable all clock/reset usage if compiling for Tegra186. This must happen at compile time rather than run-time since the custom APIs won't even be compiled in on Tegra186. In the long term, the plan would be to convert the existing custom APIs to standard APIs and get rid of the ifdefs completely. The system's main eMMC will work without any clock/reset support, since the firmware will have already initialized the controller in order to load U-Boot. Hence the driver is useful even in this apparently crippled state. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
-rw-r--r--arch/arm/include/asm/arch-tegra/tegra_mmc.h2
-rw-r--r--drivers/mmc/tegra_mmc.c32
-rw-r--r--include/fdtdec.h1
-rw-r--r--lib/fdtdec.c1
4 files changed, 35 insertions, 1 deletions
diff --git a/arch/arm/include/asm/arch-tegra/tegra_mmc.h b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
index a20bdaa..75e56c4 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_mmc.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_mmc.h
@@ -134,7 +134,9 @@ struct mmc_host {
int id; /* device id/number, 0-3 */
int enabled; /* 1 to enable, 0 to disable */
int width; /* Bus Width, 1, 4 or 8 */
+#ifndef CONFIG_TEGRA186
enum periph_id mmc_id; /* Peripheral ID: PERIPH_ID_... */
+#endif
struct gpio_desc cd_gpio; /* Change Detect GPIO */
struct gpio_desc pwr_gpio; /* Power GPIO */
struct gpio_desc wp_gpio; /* Write Protect GPIO */
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index 573819a..c9d9432 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -11,8 +11,10 @@
#include <common.h>
#include <asm/gpio.h>
#include <asm/io.h>
+#ifndef CONFIG_TEGRA186
#include <asm/arch/clock.h>
#include <asm/arch-tegra/clk_rst.h>
+#endif
#include <asm/arch-tegra/mmc.h>
#include <asm/arch-tegra/tegra_mmc.h>
#include <mmc.h>
@@ -357,8 +359,12 @@ static void mmc_change_clock(struct mmc_host *host, uint clock)
*/
if (clock == 0)
goto out;
+#ifndef CONFIG_TEGRA186
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);
writew(0, &host->reg->clkcon);
@@ -543,7 +549,9 @@ static int do_mmc_init(int dev_index, bool removable)
gpio_get_number(&host->cd_gpio));
host->clock = 0;
+#ifndef CONFIG_TEGRA186
clock_start_periph_pll(host->mmc_id, CLOCK_ID_PERIPH, 20000000);
+#endif
if (dm_gpio_is_valid(&host->pwr_gpio))
dm_gpio_set_value(&host->pwr_gpio, 1);
@@ -568,7 +576,11 @@ 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;
@@ -600,11 +612,13 @@ static int mmc_get_config(const void *blob, int node, struct mmc_host *host,
return -FDT_ERR_NOTFOUND;
}
+#ifndef CONFIG_TEGRA186
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__);
return -FDT_ERR_NOTFOUND;
}
+#endif
/*
* NOTE: mmc->bus_width is determined by mmc.c dynamically.
@@ -624,7 +638,13 @@ static int mmc_get_config(const void *blob, int node, struct mmc_host *host,
*removablep = !fdtdec_get_bool(blob, node, "non-removable");
debug("%s: found controller at %p, width = %d, periph_id = %d\n",
- __func__, host->reg, host->width, host->mmc_id);
+ __func__, host->reg, host->width,
+#ifndef CONFIG_TEGRA186
+ host->mmc_id
+#else
+ -1
+#endif
+ );
return 0;
}
@@ -668,6 +688,16 @@ void tegra_mmc_init(void)
const void *blob = gd->fdt_blob;
debug("%s entry\n", __func__);
+ /* See if any Tegra186 MMC controllers are present */
+ count = fdtdec_find_aliases_for_id(blob, "sdhci",
+ COMPAT_NVIDIA_TEGRA186_SDMMC, node_list,
+ CONFIG_SYS_MMC_MAX_DEVICE);
+ debug("%s: count of Tegra186 sdhci nodes is %d\n", __func__, count);
+ if (process_nodes(blob, node_list, count)) {
+ printf("%s: Error processing T186 mmc node(s)!\n", __func__);
+ return;
+ }
+
/* See if any Tegra210 MMC controllers are present */
count = fdtdec_find_aliases_for_id(blob, "sdhci",
COMPAT_NVIDIA_TEGRA210_SDMMC, node_list,
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 37d482a..54e3d81 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -123,6 +123,7 @@ enum fdt_compat_id {
COMPAT_NVIDIA_TEGRA124_SOR, /* Tegra 124 Serial Output Resource */
COMPAT_NVIDIA_TEGRA124_PMC, /* Tegra 124 power mgmt controller */
COMPAT_NVIDIA_TEGRA20_DC, /* Tegra 2 Display controller */
+ COMPAT_NVIDIA_TEGRA186_SDMMC, /* Tegra186 SDMMC controller */
COMPAT_NVIDIA_TEGRA210_SDMMC, /* Tegra210 SDMMC controller */
COMPAT_NVIDIA_TEGRA124_SDMMC, /* Tegra124 SDMMC controller */
COMPAT_NVIDIA_TEGRA30_SDMMC, /* Tegra30 SDMMC controller */
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 70acc29..ab002e9 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -30,6 +30,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
COMPAT(NVIDIA_TEGRA124_SOR, "nvidia,tegra124-sor"),
COMPAT(NVIDIA_TEGRA124_PMC, "nvidia,tegra124-pmc"),
COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
+ COMPAT(NVIDIA_TEGRA186_SDMMC, "nvidia,tegra186-sdhci"),
COMPAT(NVIDIA_TEGRA210_SDMMC, "nvidia,tegra210-sdhci"),
COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),