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>

1 files changed, 134 insertions, 0 deletions

diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index cc04426..6135f07 100644
--- a/board/ti/am335x/board.c
+++ b/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;