This patch adds FDT support for DWMMC, by reading the DWMMC node data
from the device tree and initialising DWMMC channels as per data
obtained from the node.
Signed-off-by: Vivek Gautam <gautam.vi...@samsung.com>
Signed-off-by: Amar <amarendra...@samsung.com>
Acked-by: Simon Glass <s...@chromium.org>
---
Changes since V1:
1)Updated code to have same signature for the function
exynos_dwmci_init() for both FDT and non-FDT versions.
2)Updated code to pass device_id parameter to the function
exynos5_mmc_set_clk_div() instead of index.
3)Updated code to decode the value of "samsung,width" from FDT.
4)Channel index is computed instead of getting from FDT.
Changes since V2:
1)Updation of commit message and resubmition of proper patch set.
Changes since V3:
1)Replaced the new function exynos5_mmc_set_clk_div() with the
existing function set_mmc_clk(). set_mmc_clk() will do the purpose.
2)Computation of FSYS block clock divisor (pre-ratio) is added.
Changes since V4:
1)Replaced "unsigned int exynos_dwmmc_init(int index, int bus_width)"
with
int exynos_dwmci_add_port(int, u32, inth, u32)
i)exynos_dwmmc_add_port() will be used by non-FDT boards.
ii)In FDT case, exynos_dwmmc_init(const void *blob) will use
exynos_dwmmc_add_port() for every channel enabled in device
node.
2)Changed the computation method of mmc clock divisor.
3)Updated exynos_dwmmc_init() to compute the 'clksel_val' within the
function.
Changes since V5:
1)Updated in response to review comments and changed the mmc clock value
from 50MHz to 52MHz.
Changes since V6:
No change.
arch/arm/include/asm/arch-exynos/dwmmc.h | 11 +--
drivers/mmc/exynos_dw_mmc.c | 127 ++++++++++++++++++++++++++++---
include/dwmmc.h | 3 +
3 files changed, 124 insertions(+), 17 deletions(-)
diff --git a/arch/arm/include/asm/arch-exynos/dwmmc.h
b/arch/arm/include/asm/arch-exynos/dwmmc.h
index 8acdf9b..3b147b8 100644
--- a/arch/arm/include/asm/arch-exynos/dwmmc.h
+++ b/arch/arm/include/asm/arch-exynos/dwmmc.h
@@ -27,10 +27,7 @@
#define DWMCI_SET_DRV_CLK(x) ((x) << 16)
#define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
-int exynos_dwmci_init(u32 regbase, int bus_width, int index);
-
-static inline unsigned int exynos_dwmmc_init(int index, int bus_width)
-{
- unsigned int base = samsung_get_base_mmc() + (0x10000 * index);
- return exynos_dwmci_init(base, bus_width, index);
-}
+#ifdef CONFIG_OF_CONTROL
+int exynos_dwmmc_init(const void *blob);
+#endif
+int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32 clksel);
diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
index 72a31b7..4238dd9 100644
--- a/drivers/mmc/exynos_dw_mmc.c
+++ b/drivers/mmc/exynos_dw_mmc.c
@@ -19,39 +19,146 @@
*/
#include <common.h>
-#include <malloc.h>
#include <dwmmc.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+#include <malloc.h>
#include <asm/arch/dwmmc.h>
#include <asm/arch/clk.h>
+#include <asm/arch/pinmux.h>
-static char *EXYNOS_NAME = "EXYNOS DWMMC";
+#define DWMMC_MAX_CH_NUM 4
+#define DWMMC_MAX_FREQ 52000000
+#define DWMMC_MIN_FREQ 400000
+#define DWMMC_MMC0_CLKSEL_VAL 0x03030001
+#define DWMMC_MMC2_CLKSEL_VAL 0x03020001
+/*
+ * Function used as callback function to initialise the
+ * CLKSEL register for every mmc channel.
+ */
static void exynos_dwmci_clksel(struct dwmci_host *host)
{
- u32 val;
- val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
- DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(0);
+ dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val);
+}
- dwmci_writel(host, DWMCI_CLKSEL, val);
+unsigned int exynos_dwmci_get_clk(int dev_index)
+{
+ return get_mmc_clk(dev_index);
}
-int exynos_dwmci_init(u32 regbase, int bus_width, int index)
+/*
+ * This function adds the mmc channel to be registered with mmc core.
+ * index - mmc channel number.
+ * regbase - register base address of mmc channel specified in 'index'.
+ * bus_width - operating bus width of mmc channel specified in 'index'.
+ * clksel - value to be written into CLKSEL register in case of FDT.
+ * NULL in case od non-FDT.
+ */
+int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32 clksel)
{
struct dwmci_host *host = NULL;
+ unsigned int div;
+ unsigned long freq, sclk;
host = malloc(sizeof(struct dwmci_host));
if (!host) {
printf("dwmci_host malloc fail!\n");
return 1;
}
+ /* request mmc clock vlaue of 52MHz. */
+ freq = 52000000;
+ sclk = get_mmc_clk(index);
+ div = DIV_ROUND_UP(sclk, freq);
+ /* set the clock divisor for mmc */
+ set_mmc_clk(index, div);
- host->name = EXYNOS_NAME;
+ host->name = "EXYNOS DWMMC";
host->ioaddr = (void *)regbase;
host->buswidth = bus_width;
+
+ if (clksel) {
+ host->clksel_val = clksel;
+ } else {
+ if (0 == index)
+ host->clksel_val = DWMMC_MMC0_CLKSEL_VAL;
+ if (2 == index)
+ host->clksel_val = DWMMC_MMC2_CLKSEL_VAL;
+ }
+
host->clksel = exynos_dwmci_clksel;
host->dev_index = index;
+ host->mmc_clk = exynos_dwmci_get_clk;
+ /* Add the mmc channel to be registered with mmc core */
+ if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
+ debug("dwmmc%d registration failed\n", index);
+ return -1;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_OF_CONTROL
+int exynos_dwmmc_init(const void *blob)
+{
+ int index, bus_width;
+ int node_list[DWMMC_MAX_CH_NUM];
+ int err = 0, dev_id, flag, count, i;
+ u32 clksel_val, base, timing[3];
+
+ count = fdtdec_find_aliases_for_id(blob, "mmc",
+ COMPAT_SAMSUNG_EXYNOS5_DWMMC, node_list,
+ DWMMC_MAX_CH_NUM);
+
+ for (i = 0; i < count; i++) {
+ int node = node_list[i];
+
+ if (node <= 0)
+ continue;
- add_dwmci(host, 52000000, 400000);
+ /* Extract device id for each mmc channel */
+ dev_id = pinmux_decode_periph_id(blob, node);
+ /* Get the bus width from the device node */
+ bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
+ if (bus_width <= 0) {
+ debug("DWMMC: Can't get bus-width\n");
+ return -1;
+ }
+ if (8 == bus_width)
+ flag = PINMUX_FLAG_8BIT_MODE;
+ else
+ flag = PINMUX_FLAG_NONE;
+
+ /* config pinmux for each mmc channel */
+ err = exynos_pinmux_config(dev_id, flag);
+ if (err) {
+ debug("DWMMC not configured\n");
+ return err;
+ }
+
+ index = dev_id - PERIPH_ID_SDMMC0;
+
+ /* Get the base address from the device node */
+ base = fdtdec_get_addr(blob, node, "reg");
+ if (!base) {
+ debug("DWMMC: Can't get base address\n");
+ return -1;
+ }
+ /* Extract the timing info from the node */
+ err = fdtdec_get_int_array(blob, node, "samsung,timing",
+ timing, 3);
+ if (err) {
+ debug("Can't get sdr-timings for divider\n");
+ return -1;
+ }
+
+ clksel_val = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
+ DWMCI_SET_DRV_CLK(timing[1]) |
+ DWMCI_SET_DIV_RATIO(timing[2]));
+ /* Initialise each mmc channel */
+ err = exynos_dwmci_add_port(index, base, bus_width, clksel_val);
+ if (err)
+ debug("dwmmc Channel-%d init failed\n", index);
+ }
return 0;
}
-
+#endif
diff --git a/include/dwmmc.h b/include/dwmmc.h
index c8b1d40..e142f3e 100644
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -123,6 +123,8 @@
#define MSIZE(x) ((x) << 28)
#define RX_WMARK(x) ((x) << 16)
#define TX_WMARK(x) (x)
+#define RX_WMARK_SHIFT 16
+#define RX_WMARK_MASK (0xfff << RX_WMARK_SHIFT)
#define DWMCI_IDMAC_OWN (1 << 31)
#define DWMCI_IDMAC_CH (1 << 4)
@@ -144,6 +146,7 @@ struct dwmci_host {
unsigned int bus_hz;
int dev_index;
int buswidth;
+ u32 clksel_val;
u32 fifoth_val;
struct mmc *mmc;
--
1.8.0
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