exynos5: Add DT based driver for SMC911X ethernet

Add device tree based ethernet driver for SMC911X controller on
SMDK5250 boards.

Signed-off-by: Hatim Ali <hatim.rv@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/include/asm/arch-exynos/sromc.h

@@ -48,4 +48,22 @@ struct s5p_sromc {
 /* Configure the Band Width and Bank Control Regs for required SROMC Bank */
 void s5p_config_sromc(u32 srom_bank, u32 srom_bw_conf, u32 srom_bc_conf);
 
+enum {
+	FDT_SROM_PMC,
+	FDT_SROM_TACP,
+	FDT_SROM_TAH,
+	FDT_SROM_TCOH,
+	FDT_SROM_TACC,
+	FDT_SROM_TCOS,
+	FDT_SROM_TACS,
+
+	FDT_SROM_TIMING_COUNT,
+};
+
+struct fdt_sromc {
+	u8 bank;	/* srom bank number */
+	u8 width;	/* bus width in bytes */
+	unsigned int timing[FDT_SROM_TIMING_COUNT]; /* timing parameters */
+};
+
 #endif /* __ASM_ARCH_SROMC_H_ */

board/samsung/smdk5250/smdk5250.c

@@ -21,6 +21,7 @@
  */
 
 #include <common.h>
+#include <fdtdec.h>
 #include <asm/io.h>
 #include <i2c.h>
 #include <netdev.h>
@@ -34,34 +35,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#ifdef CONFIG_SMC911X
-static int smc9115_pre_init(void)
-{
-	u32 smc_bw_conf, smc_bc_conf;
-	int err;
-
-	/* Ethernet needs data bus width of 16 bits */
-	smc_bw_conf = SROMC_DATA16_WIDTH(CONFIG_ENV_SROM_BANK)
-			| SROMC_BYTE_ENABLE(CONFIG_ENV_SROM_BANK);
-
-	smc_bc_conf = SROMC_BC_TACS(0x01) | SROMC_BC_TCOS(0x01)
-			| SROMC_BC_TACC(0x06) | SROMC_BC_TCOH(0x01)
-			| SROMC_BC_TAH(0x0C)  | SROMC_BC_TACP(0x09)
-			| SROMC_BC_PMC(0x01);
-
-	/* Select and configure the SROMC bank */
-	err = exynos_pinmux_config(PERIPH_ID_SROMC,
-				CONFIG_ENV_SROM_BANK | PINMUX_FLAG_16BIT);
-	if (err) {
-		debug("SROMC not configured\n");
-		return err;
-	}
-
-	s5p_config_sromc(CONFIG_ENV_SROM_BANK, smc_bw_conf, smc_bc_conf);
-	return 0;
-}
-#endif
-
 int board_init(void)
 {
 	gd->bd->bi_boot_params = (PHYS_SDRAM_1 + 0x100UL);
@@ -122,12 +95,94 @@ void dram_init_banksize(void)
 							PHYS_SDRAM_8_SIZE);
 }
 
+#ifdef CONFIG_OF_CONTROL
+static int decode_sromc(const void *blob, struct fdt_sromc *config)
+{
+	int err;
+	int node;
+
+	node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SROMC);
+	if (node < 0) {
+		debug("Could not find SROMC node\n");
+		return node;
+	}
+
+	config->bank = fdtdec_get_int(blob, node, "bank", 0);
+	config->width = fdtdec_get_int(blob, node, "width", 2);
+
+	err = fdtdec_get_int_array(blob, node, "srom-timing", config->timing,
+			FDT_SROM_TIMING_COUNT);
+	if (err < 0) {
+		debug("Could not decode SROMC configuration\n");
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	return 0;
+}
+#endif
+
 int board_eth_init(bd_t *bis)
 {
 #ifdef CONFIG_SMC911X
-	if (smc9115_pre_init())
+	u32 smc_bw_conf, smc_bc_conf;
+	struct fdt_sromc config;
+	fdt_addr_t base_addr;
+	int node;
+
+#ifdef CONFIG_OF_CONTROL
+	node = decode_sromc(gd->fdt_blob, &config);
+	if (node < 0) {
+		debug("%s: Could not find sromc configuration\n", __func__);
+		return 0;
+	}
+	node = fdtdec_next_compatible(gd->fdt_blob, node, COMPAT_SMSC_LAN9215);
+	if (node < 0) {
+		debug("%s: Could not find lan9215 configuration\n", __func__);
+		return 0;
+	}
+
+	/* We now have a node, so any problems from now on are errors */
+	base_addr = fdtdec_get_addr(gd->fdt_blob, node, "reg");
+	if (base_addr == FDT_ADDR_T_NONE) {
+		debug("%s: Could not find lan9215 address\n", __func__);
 		return -1;
-	return smc911x_initialize(0, CONFIG_SMC911X_BASE);
+	}
+#else
+	/* Non-FDT configuration - bank number and timing parameters*/
+	config.bank = CONFIG_ENV_SROM_BANK;
+	config.width = 2;
+
+	config.timing[FDT_SROM_TACS] = 0x01;
+	config.timing[FDT_SROM_TCOS] = 0x01;
+	config.timing[FDT_SROM_TACC] = 0x06;
+	config.timing[FDT_SROM_TCOH] = 0x01;
+	config.timing[FDT_SROM_TAH] = 0x0C;
+	config.timing[FDT_SROM_TACP] = 0x09;
+	config.timing[FDT_SROM_PMC] = 0x01;
+	base_addr = CONFIG_SMC911X_BASE;
+#endif
+
+	/* Ethernet needs data bus width of 16 bits */
+	if (config.width != 2) {
+		debug("%s: Unsupported bus width %d\n", __func__,
+			config.width);
+		return -1;
+	}
+	smc_bw_conf = SROMC_DATA16_WIDTH(config.bank)
+			| SROMC_BYTE_ENABLE(config.bank);
+
+	smc_bc_conf = SROMC_BC_TACS(config.timing[FDT_SROM_TACS])   |\
+			SROMC_BC_TCOS(config.timing[FDT_SROM_TCOS]) |\
+			SROMC_BC_TACC(config.timing[FDT_SROM_TACC]) |\
+			SROMC_BC_TCOH(config.timing[FDT_SROM_TCOH]) |\
+			SROMC_BC_TAH(config.timing[FDT_SROM_TAH])   |\
+			SROMC_BC_TACP(config.timing[FDT_SROM_TACP]) |\
+			SROMC_BC_PMC(config.timing[FDT_SROM_PMC]);
+
+	/* Select and configure the SROMC bank */
+	exynos_pinmux_config(PERIPH_ID_SROMC, config.bank);
+	s5p_config_sromc(config.bank, smc_bw_conf, smc_bc_conf);
+	return smc911x_initialize(0, base_addr);
 #endif
 	return 0;
 }