davinci: Handle pinmux conflict between mmc/sd and nor flash

On DA850/OMAP-L138 EVM, MMC/SD and NOR Flash share
some of the AEMIF pins. This patch prints out a warning
during booting, if both MMC/SD and NOR Flash are enabled
in kernel menuconfig.

If both MMC/SD and NOR Flash are enabled, only MMC/SD
will work correctly.

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 42 insertions, 21 deletions

diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index 70a2f487da95..f2946a0cf6f6 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -244,6 +244,20 @@ static void __init da850_evm_init_nor(void)
         iounmap(aemif_addr);
 }
 
+#if defined(CONFIG_MTD_PHYSMAP) || \
+    defined(CONFIG_MTD_PHYSMAP_MODULE)
+#define HAS_NOR 1
+#else
+#define HAS_NOR 0
+#endif
+
+#if defined(CONFIG_MMC_DAVINCI) || \
+    defined(CONFIG_MMC_DAVINCI_MODULE)
+#define HAS_MMC 1
+#else
+#define HAS_MMC 0
+#endif
+
 static __init void da850_evm_init(void)
 {
         struct davinci_soc_info *soc_info = &davinci_soc_info;
@@ -298,27 +312,34 @@ static __init void da850_evm_init(void)
                 pr_warning("da830_evm_init: watchdog registration failed: %d\n",
                                 ret);
 
-        ret = da8xx_pinmux_setup(da850_mmcsd0_pins);
-        if (ret)
-                pr_warning("da850_evm_init: mmcsd0 mux setup failed: %d\n",
-                                ret);
-
-        ret = gpio_request(DA850_MMCSD_CD_PIN, "MMC CD\n");
-        if (ret)
-                pr_warning("da850_evm_init: can not open GPIO %d\n",
-                                DA850_MMCSD_CD_PIN);
-        gpio_direction_input(DA850_MMCSD_CD_PIN);
-
-        ret = gpio_request(DA850_MMCSD_WP_PIN, "MMC WP\n");
-        if (ret)
-                pr_warning("da850_evm_init: can not open GPIO %d\n",
-                                DA850_MMCSD_WP_PIN);
-        gpio_direction_input(DA850_MMCSD_WP_PIN);
-
-        ret = da8xx_register_mmcsd0(&da850_mmc_config);
-        if (ret)
-                pr_warning("da850_evm_init: mmcsd0 registration failed: %d\n",
-                                ret);
+        if (HAS_MMC) {
+                if (HAS_NOR)
+                        pr_warning("WARNING: both NOR Flash and MMC/SD are "
+                                "enabled, but they share AEMIF pins.\n"
+                                "\tDisable one of them.\n");
+
+                ret = da8xx_pinmux_setup(da850_mmcsd0_pins);
+                if (ret)
+                        pr_warning("da850_evm_init: mmcsd0 mux setup failed:"
+                                        " %d\n", ret);
+
+                ret = gpio_request(DA850_MMCSD_CD_PIN, "MMC CD\n");
+                if (ret)
+                        pr_warning("da850_evm_init: can not open GPIO %d\n",
+                                        DA850_MMCSD_CD_PIN);
+                gpio_direction_input(DA850_MMCSD_CD_PIN);
+
+                ret = gpio_request(DA850_MMCSD_WP_PIN, "MMC WP\n");
+                if (ret)
+                        pr_warning("da850_evm_init: can not open GPIO %d\n",
+                                        DA850_MMCSD_WP_PIN);
+                gpio_direction_input(DA850_MMCSD_WP_PIN);
+
+                ret = da8xx_register_mmcsd0(&da850_mmc_config);
+                if (ret)
+                        pr_warning("da850_evm_init: mmcsd0 registration failed:"
+                                        " %d\n", ret);
+        }
 
         davinci_serial_init(&da850_evm_uart_config);