karo: tx53: setup PMIC to use BURST mode for better efficiency

diff --git a/board/karo/tx53/tx53.c b/board/karo/tx53/tx53.c
index 4ed1764126f1c0f501aace01a23660c87f32adae..cfc63e8f7d4eb530282451dcdee7837f189fbd14 100644 (file)
--- a/board/karo/tx53/tx53.c
+++ b/board/karo/tx53/tx53.c
@@ -20,6 +20,7 @@
 #include <errno.h>
 #include <libfdt.h>
 #include <fdt_support.h>
+#include <i2c.h>
 #include <lcd.h>
 #include <netdev.h>
 #include <mmc.h>
@@ -186,6 +187,126 @@ static void tx53_print_cpuinfo(void)
        print_reset_cause();
 }
 
+enum LTC3589_REGS {
+       LTC3589_SCR1 = 0x07,
+       LTC3589_CLIRQ = 0x21,
+       LTC3589_B1DTV1 = 0x23,
+       LTC3589_B1DTV2 = 0x24,
+       LTC3589_VRRCR = 0x25,
+       LTC3589_B2DTV1 = 0x26,
+       LTC3589_B2DTV2 = 0x27,
+       LTC3589_B3DTV1 = 0x29,
+       LTC3589_B3DTV2 = 0x2a,
+       LTC3589_L2DTV1 = 0x32,
+       LTC3589_L2DTV2 = 0x33,
+};
+
+#define LTC3589_PGOOD_MASK     (1 << 5)
+
+#define LTC3589_CLK_RATE_LOW   (1 << 5)
+
+#define VDD_LDO2_10mV          vout_to_vref(1325 * 10, 2)
+#define VDD_CORE_10mV          vout_to_vref(1240 * 10, 3)
+#define VDD_SOC_10mV           vout_to_vref(1325 * 10, 4)
+#define VDD_BUCK3_10mV         vout_to_vref(2500 * 10, 5)
+
+#ifndef CONFIG_SYS_TX53_HWREV_2
+/* LDO2 vref divider */
+#define R1_2   180
+#define R2_2   191
+/* BUCK1 vref divider */
+#define R1_3   150
+#define R2_3   180
+/* BUCK2 vref divider */
+#define R1_4   180
+#define R2_4   191
+/* BUCK3 vref divider */
+#define R1_5   270
+#define R2_5   100
+#else
+/* no dividers on vref */
+#define R1_2   0
+#define R2_2   1
+#define R1_3   0
+#define R2_3   1
+#define R1_4   0
+#define R2_4   1
+#define R1_5   0
+#define R2_5   1
+#endif
+
+/* calculate voltages in 10mV */
+#define R1(idx)                        R1_##idx
+#define R2(idx)                        R2_##idx
+
+#define vout_to_vref(vout, idx)        ((vout) * R2(idx) / (R1(idx) + R2(idx)))
+#define vref_to_vout(vref, idx)        ((vref) * (R1(idx) + R2(idx)) / R2(idx))
+
+#define mV_to_regval(mV)       (((((mV) < 3625) ? 3625 : (mV)) - 3625) / 125)
+#define regval_to_mV(v)                (((v) * 125 + 3625))
+
+static struct pmic_regs {
+       enum LTC3589_REGS addr;
+       u8 val;
+} ltc3589_regs[] = {
+       { LTC3589_SCR1, 0x55, }, /* burst mode for all regulators */
+
+       { LTC3589_L2DTV1, mV_to_regval(VDD_LDO2_10mV) | LTC3589_PGOOD_MASK, },
+       { LTC3589_L2DTV2, mV_to_regval(VDD_LDO2_10mV) | LTC3589_CLK_RATE_LOW, },
+
+       { LTC3589_B1DTV1, mV_to_regval(VDD_CORE_10mV) | LTC3589_PGOOD_MASK, },
+       { LTC3589_B1DTV2, mV_to_regval(VDD_CORE_10mV) | LTC3589_CLK_RATE_LOW, },
+
+       { LTC3589_B2DTV1, mV_to_regval(VDD_SOC_10mV) | LTC3589_PGOOD_MASK, },
+       { LTC3589_B2DTV2, mV_to_regval(VDD_SOC_10mV) | LTC3589_CLK_RATE_LOW, },
+
+       { LTC3589_B3DTV1, mV_to_regval(VDD_BUCK3_10mV) | LTC3589_PGOOD_MASK, },
+       { LTC3589_B3DTV2, mV_to_regval(VDD_BUCK3_10mV) | LTC3589_CLK_RATE_LOW, },
+
+       { LTC3589_CLIRQ, 0, }, /* clear all interrupt flags */
+};
+
+static int setup_pmic_voltages(void)
+{
+       int ret;
+       unsigned char value;
+       int i;
+
+       ret = i2c_probe(CONFIG_SYS_I2C_SLAVE);
+       if (ret != 0) {
+               printf("Failed to initialize I2C\n");
+               return ret;
+       }
+
+       ret = i2c_read(CONFIG_SYS_I2C_SLAVE, 0x11, 1, &value, 1);
+       if (ret) {
+               printf("%s: i2c_read error: %d\n", __func__, ret);
+               return ret;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(ltc3589_regs); i++) {
+               ret = i2c_read(CONFIG_SYS_I2C_SLAVE, ltc3589_regs[i].addr, 1,
+                               &value, 1);
+               debug("Writing %02x to reg %02x (%02x)\n",
+                       ltc3589_regs[i].val, ltc3589_regs[i].addr, value);
+               ret = i2c_write(CONFIG_SYS_I2C_SLAVE, ltc3589_regs[i].addr, 1,
+                               &ltc3589_regs[i].val, 1);
+               if (ret) {
+                       printf("%s: failed to write PMIC register %02x: %d\n",
+                               __func__, ltc3589_regs[i].addr, ret);
+                       return ret;
+               }
+       }
+       printf("VDDCORE set to %3d.%dmV\n",
+               vref_to_vout(regval_to_mV(mV_to_regval(VDD_CORE_10mV)), 3) / 10,
+               vref_to_vout(regval_to_mV(mV_to_regval(VDD_CORE_10mV)), 3) % 10);
+
+       printf("VDDSOC  set to %3d.%dmV\n",
+               vref_to_vout(regval_to_mV(mV_to_regval(VDD_SOC_10mV)), 4) / 10,
+               vref_to_vout(regval_to_mV(mV_to_regval(VDD_SOC_10mV)), 4) % 10);
+       return 0;
+}
+
 int board_early_init_f(void)
 {
        struct mxc_ccm_reg *ccm_regs = (void *)CCM_BASE_ADDR;
@@ -226,8 +347,16 @@ int board_early_init_f(void)
 
 int board_init(void)
 {
+       int ret;
+
        /* Address of boot parameters */
        gd->bd->bi_boot_params = PHYS_SDRAM_1 + 0x1000;
+
+       ret = setup_pmic_voltages();
+       if (ret) {
+               printf("Failed to setup PMIC voltages\n");
+               hang();
+       }
        return 0;
 }
 

diff --git a/include/configs/tx53.h b/include/configs/tx53.h
index 896abc8bc93465854aa94804f63bd4d9d31f728d..717b053866cbf1a1a6332bcebf39d45dc93168dc 100644 (file)
--- a/include/configs/tx53.h
+++ b/include/configs/tx53.h
@@ -152,6 +152,7 @@
 #define CONFIG_CMD_MTDPARTS
 #define CONFIG_CMD_BOOTCE
 #define CONFIG_CMD_TIME
+#define CONFIG_CMD_I2C
 #define CONFIG_CMD_MEMTEST
 
 /*
@@ -185,6 +186,18 @@
 #define CONFIG_BOOTP_DNS
 #endif
 
+/*
+ * I2C Configs
+ */
+#ifdef CONFIG_CMD_I2C
+#define CONFIG_HARD_I2C
+#define CONFIG_I2C_MXC
+#define CONFIG_SYS_I2C_BASE            I2C1_BASE_ADDR
+#define CONFIG_SYS_I2C_MX6_PORT1
+#define CONFIG_SYS_I2C_SPEED           400000
+#define CONFIG_SYS_I2C_SLAVE           0x34
+#endif
+
 /*
  * NAND flash driver
  */