mmc: dw_mmc: Probe the MMC from OF

[karo-tx-uboot.git] / drivers / mmc / socfpga_dw_mmc.c

diff --git a/drivers/mmc/socfpga_dw_mmc.c b/drivers/mmc/socfpga_dw_mmc.c
index eb69aed9dfb48cfa462489eb3e7fe99664e2d234..8076761e06e0d44bcc0924864d94c40c450a434e 100644 (file)
--- a/drivers/mmc/socfpga_dw_mmc.c
+++ b/drivers/mmc/socfpga_dw_mmc.c
@@ -6,6 +6,8 @@
 
 #include <common.h>
 #include <malloc.h>
+#include <fdtdec.h>
+#include <libfdt.h>
 #include <dwmmc.h>
 #include <errno.h>
 #include <asm/arch/dwmmc.h>
@@ -42,34 +44,87 @@ static void socfpga_dwmci_clksel(struct dwmci_host *host)
                CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
 }
 
-int socfpga_dwmmc_init(u32 regbase, int bus_width, int index)
+static int socfpga_dwmci_of_probe(const void *blob, int node, const int idx)
 {
+       /* FIXME: probe from DT eventually too/ */
+       const unsigned long clk = cm_get_mmc_controller_clk_hz();
+
        struct dwmci_host *host;
-       unsigned long clk = cm_get_mmc_controller_clk_hz();
+       fdt_addr_t reg_base;
+       int bus_width, fifo_depth;
 
        if (clk == 0) {
-               printf("%s: MMC clock is zero!", __func__);
+               printf("DWMMC%d: MMC clock is zero!", idx);
                return -EINVAL;
        }
 
-       /* calloc for zero init */
-       host = calloc(1, sizeof(struct dwmci_host));
-       if (!host) {
-               printf("%s: calloc() failed!\n", __func__);
-               return -ENOMEM;
+       /* Get the register address from the device node */
+       reg_base = fdtdec_get_addr(blob, node, "reg");
+       if (!reg_base) {
+               printf("DWMMC%d: Can't get base address\n", idx);
+               return -EINVAL;
+       }
+
+       /* Get the bus width from the device node */
+       bus_width = fdtdec_get_int(blob, node, "bus-width", 0);
+       if (bus_width <= 0) {
+               printf("DWMMC%d: Can't get bus-width\n", idx);
+               return -EINVAL;
        }
 
+       fifo_depth = fdtdec_get_int(blob, node, "fifo-depth", 0);
+       if (fifo_depth < 0) {
+               printf("DWMMC%d: Can't get FIFO depth\n", idx);
+               return -EINVAL;
+       }
+
+       /* Allocate the host */
+       host = calloc(1, sizeof(*host));
+       if (!host)
+               return -ENOMEM;
+
        host->name = "SOCFPGA DWMMC";
-       host->ioaddr = (void *)regbase;
+       host->ioaddr = (void *)reg_base;
        host->buswidth = bus_width;
        host->clksel = socfpga_dwmci_clksel;
-       host->dev_index = index;
-       /* fixed clock divide by 4 which due to the SDMMC wrapper */
+       host->dev_index = idx;
+       /* Fixed clock divide by 4 which due to the SDMMC wrapper */
        host->bus_hz = clk;
        host->fifoth_val = MSIZE(0x2) |
-               RX_WMARK(CONFIG_SOCFPGA_DWMMC_FIFO_DEPTH / 2 - 1) |
-               TX_WMARK(CONFIG_SOCFPGA_DWMMC_FIFO_DEPTH / 2);
+               RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth / 2);
 
        return add_dwmci(host, host->bus_hz, 400000);
 }
 
+static int socfpga_dwmci_process_node(const void *blob, int nodes[],
+                                     int count)
+{
+       int i, node, ret;
+
+       for (i = 0; i < count; i++) {
+               node = nodes[i];
+               if (node <= 0)
+                       continue;
+
+               ret = socfpga_dwmci_of_probe(blob, node, i);
+               if (ret) {
+                       printf("%s: failed to decode dev %d\n", __func__, i);
+                       return ret;
+               }
+       }
+       return 0;
+}
+
+int socfpga_dwmmc_init(const void *blob)
+{
+       int nodes[2];   /* Max. two controllers. */
+       int ret, count;
+
+       count = fdtdec_find_aliases_for_id(blob, "mmc",
+                                          COMPAT_ALTERA_SOCFPGA_DWMMC,
+                                          nodes, ARRAY_SIZE(nodes));
+
+       ret = socfpga_dwmci_process_node(blob, nodes, count);
+
+       return ret;
+}