am335x_evm: am33xx_spl_board_init function and scale core frequency

Add a am33xx_spl_board_init (and enable the PMICs) that we may see,
depending on the board we are running on.  In all cases, we see if we
can rely on the efuse_sma register to tell us the maximum speed.  In the
case of Beaglebone White, we need to make sure we are on AC power, and
are on later than rev A1, and then we can ramp up to the PG1.0 maximum
of 720Mhz.  In the case of Beaglebone Black, we are either on PG2.0 that
supports 1GHz or PG2.1.  As PG2.0 may or may not have efuse_sma set, we
cannot rely on this probe.  In the case of the GP EVM, EVM SK and IDK we
need to rely on the efuse_sma if we are on PG2.1, and the defaults for
PG1.0/2.0.

Signed-off-by: Tom Rini <trini@ti.com>

arch/arm/cpu/armv7/am33xx/sys_info.c

@@ -17,6 +17,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/clock.h>
+#include <power/tps65910.h>
 
 struct ctrl_stat *cstat = (struct ctrl_stat *)CTRL_BASE;
 
@@ -119,3 +120,59 @@ int print_cpuinfo(void)
 	return 0;
 }
 #endif	/* CONFIG_DISPLAY_CPUINFO */
+
+#ifdef CONFIG_AM33XX
+int am335x_get_efuse_mpu_max_freq(struct ctrl_dev *cdev)
+{
+	int sil_rev;
+
+	sil_rev = readl(&cdev->deviceid) >> 28;
+
+	if (sil_rev == 1)
+		/* PG 2.0, efuse may not be set. */
+		return MPUPLL_M_800;
+	else if (sil_rev >= 2) {
+		/* Check what the efuse says our max speed is. */
+		int efuse_arm_mpu_max_freq;
+		efuse_arm_mpu_max_freq = readl(&cdev->efuse_sma);
+		switch ((efuse_arm_mpu_max_freq & DEVICE_ID_MASK)) {
+		case AM335X_ZCZ_1000:
+			return MPUPLL_M_1000;
+		case AM335X_ZCZ_800:
+			return MPUPLL_M_800;
+		case AM335X_ZCZ_720:
+			return MPUPLL_M_720;
+		case AM335X_ZCZ_600:
+		case AM335X_ZCE_600:
+			return MPUPLL_M_600;
+		case AM335X_ZCZ_300:
+		case AM335X_ZCE_300:
+			return MPUPLL_M_300;
+		}
+	}
+
+	/* PG 1.0 or otherwise unknown, use the PG1.0 max */
+	return MPUPLL_M_720;
+}
+
+int am335x_get_tps65910_mpu_vdd(int sil_rev, int frequency)
+{
+	/* For PG2.1 and later, we have one set of values. */
+	if (sil_rev >= 2) {
+		switch (frequency) {
+		case MPUPLL_M_1000:
+			return TPS65910_OP_REG_SEL_1_3_2_5;
+		case MPUPLL_M_800:
+			return TPS65910_OP_REG_SEL_1_2_6;
+		case MPUPLL_M_720:
+			return TPS65910_OP_REG_SEL_1_2_0;
+		case MPUPLL_M_600:
+		case MPUPLL_M_300:
+			return TPS65910_OP_REG_SEL_1_1_3;
+		}
+	}
+
+	/* Default to PG1.0/PG2.0 values. */
+	return TPS65910_OP_REG_SEL_1_1_3;
+}
+#endif

arch/arm/include/asm/arch-am33xx/clocks_am33xx.h

@@ -11,9 +11,17 @@
 #ifndef _CLOCKS_AM33XX_H_
 #define _CLOCKS_AM33XX_H_
 
+/* MAIN PLL Fdll supported frequencies */
+#define MPUPLL_M_1000	1000
+#define MPUPLL_M_800	800
+#define MPUPLL_M_720	720
+#define MPUPLL_M_600	600
+#define MPUPLL_M_550	550
+#define MPUPLL_M_300	300
+
 /* MAIN PLL Fdll = 550 MHz, by default */
 #ifndef CONFIG_SYS_MPUCLK
-#define CONFIG_SYS_MPUCLK	550
+#define CONFIG_SYS_MPUCLK	MPUPLL_M_550
 #endif
 
 #define UART_RESET		(0x1 << 1)

arch/arm/include/asm/arch-am33xx/sys_proto.h

@@ -10,6 +10,7 @@
 
 #ifndef _SYS_PROTO_H_
 #define _SYS_PROTO_H_
+#include <asm/arch/cpu.h>
 
 #define BOARD_REV_ID	0x0
 
@@ -43,4 +44,6 @@ u32 wait_on_value(u32, u32, void *, u32);
 void enable_norboot_pin_mux(void);
 #endif
 void am33xx_spl_board_init(void);
+int am335x_get_efuse_mpu_max_freq(struct ctrl_dev *cdev);
+int am335x_get_tps65910_mpu_vdd(int sil_rev, int frequency);
 #endif

board/ti/am335x/board.c

@@ -26,6 +26,8 @@
 #include <i2c.h>
 #include <miiphy.h>
 #include <cpsw.h>
+#include <power/tps65217.h>
+#include <power/tps65910.h>
 #include "board.h"
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -244,6 +246,138 @@ const struct dpll_params dpll_ddr_evm_sk = {
 const struct dpll_params dpll_ddr_bone_black = {
 		400, OSC-1, 1, -1, -1, -1, -1};
 
+void am33xx_spl_board_init(void)
+{
+	struct am335x_baseboard_id header;
+	struct dpll_params dpll_mpu = {0, OSC-1, 1, -1, -1, -1, -1};
+	int mpu_vdd;
+
+	if (read_eeprom(&header) < 0)
+		puts("Could not get board ID.\n");
+
+	/* Get the frequency */
+	dpll_mpu.m = am335x_get_efuse_mpu_max_freq(cdev);
+
+	if (board_is_bone(&header) || board_is_bone_lt(&header)) {
+		/* BeagleBone PMIC Code */
+		int usb_cur_lim;
+
+		/*
+		 * Only perform PMIC configurations if board rev > A1
+		 * on Beaglebone White
+		 */
+		if (board_is_bone(&header) && !strncmp(header.version,
+						       "00A1", 4))
+			return;
+
+		if (i2c_probe(TPS65217_CHIP_PM))
+			return;
+
+		/*
+		 * On Beaglebone White we need to ensure we have AC power
+		 * before increasing the frequency.
+		 */
+		if (board_is_bone(&header)) {
+			uchar pmic_status_reg;
+			if (tps65217_reg_read(TPS65217_STATUS,
+					      &pmic_status_reg))
+				return;
+			if (!(pmic_status_reg & TPS65217_PWR_SRC_AC_BITMASK)) {
+				puts("No AC power, disabling frequency switch\n");
+				return;
+			}
+		}
+
+		/*
+		 * Override what we have detected since we know if we have
+		 * a Beaglebone Black it supports 1GHz.
+		 */
+		if (board_is_bone_lt(&header))
+			dpll_mpu.m = MPUPLL_M_1000;
+
+		/*
+		 * Increase USB current limit to 1300mA or 1800mA and set
+		 * the MPU voltage controller as needed.
+		 */
+		if (dpll_mpu.m == MPUPLL_M_1000) {
+			usb_cur_lim = TPS65217_USB_INPUT_CUR_LIMIT_1800MA;
+			mpu_vdd = TPS65217_DCDC_VOLT_SEL_1325MV;
+		} else {
+			usb_cur_lim = TPS65217_USB_INPUT_CUR_LIMIT_1300MA;
+			mpu_vdd = TPS65217_DCDC_VOLT_SEL_1275MV;
+		}
+
+		if (tps65217_reg_write(TPS65217_PROT_LEVEL_NONE,
+				       TPS65217_POWER_PATH,
+				       usb_cur_lim,
+				       TPS65217_USB_INPUT_CUR_LIMIT_MASK))
+			puts("tps65217_reg_write failure\n");
+
+
+		/* Set DCDC2 (MPU) voltage */
+		if (tps65217_voltage_update(TPS65217_DEFDCDC2, mpu_vdd)) {
+			puts("tps65217_voltage_update failure\n");
+			return;
+		}
+
+		/*
+		 * Set LDO3, LDO4 output voltage to 3.3V for Beaglebone.
+		 * Set LDO3 to 1.8V and LDO4 to 3.3V for Beaglebone Black.
+		 */
+		if (board_is_bone(&header)) {
+			if (tps65217_reg_write(TPS65217_PROT_LEVEL_2,
+					       TPS65217_DEFLS1,
+					       TPS65217_LDO_VOLTAGE_OUT_3_3,
+					       TPS65217_LDO_MASK))
+				puts("tps65217_reg_write failure\n");
+		} else {
+			if (tps65217_reg_write(TPS65217_PROT_LEVEL_2,
+					       TPS65217_DEFLS1,
+					       TPS65217_LDO_VOLTAGE_OUT_1_8,
+					       TPS65217_LDO_MASK))
+				puts("tps65217_reg_write failure\n");
+		}
+
+		if (tps65217_reg_write(TPS65217_PROT_LEVEL_2,
+				       TPS65217_DEFLS2,
+				       TPS65217_LDO_VOLTAGE_OUT_3_3,
+				       TPS65217_LDO_MASK))
+			puts("tps65217_reg_write failure\n");
+	} else {
+		int sil_rev;
+
+		/*
+		 * The GP EVM, IDK and EVM SK use a TPS65910 PMIC.  For all
+		 * MPU frequencies we support we use a CORE voltage of
+		 * 1.1375V.  For MPU voltage we need to switch based on
+		 * the frequency we are running at.
+		 */
+		if (i2c_probe(TPS65910_CTRL_I2C_ADDR))
+			return;
+
+		/*
+		 * Depending on MPU clock and PG we will need a different
+		 * VDD to drive at that speed.
+		 */
+		sil_rev = readl(&cdev->deviceid) >> 28;
+		mpu_vdd = am335x_get_tps65910_mpu_vdd(sil_rev, dpll_mpu.m);
+
+		/* Tell the TPS65910 to use i2c */
+		tps65910_set_i2c_control();
+
+		/* First update MPU voltage. */
+		if (tps65910_voltage_update(MPU, mpu_vdd))
+			return;
+
+		/* Second, update the CORE voltage. */
+		if (tps65910_voltage_update(CORE, TPS65910_OP_REG_SEL_1_1_3))
+			return;
+	}
+
+	/* Set MPU Frequency to what we detected now that voltages are set */
+	do_setup_dpll(&dpll_mpu_regs, &dpll_mpu);
+}
+
 const struct dpll_params *get_dpll_ddr_params(void)
 {
 	struct am335x_baseboard_id header;

include/configs/am335x_evm.h

@@ -189,8 +189,13 @@
 #define CONFIG_SYS_I2C_EEPROM_ADDR_LEN	2
 #define CONFIG_SYS_I2C_MULTI_EEPROMS
 
+/* PMIC support */
+#define CONFIG_POWER_TPS65217
+#define CONFIG_POWER_TPS65910
+
 /* SPL */
 #ifndef CONFIG_NOR_BOOT
+#define CONFIG_SPL_POWER_SUPPORT
 #define CONFIG_SPL_YMODEM_SUPPORT
 
 /* CPSW support */