[U-Boot] [PATCH 6/6] am335x_evm: am33xx_spl_board_init function and scale core frequency

Dan Murphy
2013-07-23T18:46:53Z

On 07/19/2013 02:00 PM, Tom Rini wrote:
> 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/include/asm/arch-am33xx/clocks_am33xx.h | 8 ++
> board/ti/am335x/board.c | 155 ++++++++++++++++++++++
> include/configs/am335x_evm.h | 4 +
> 3 files changed, 167 insertions(+)
>
> diff --git a/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h b/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
> index 89b63d9..834f24f 100644
> --- a/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
> +++ b/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
> @@ -24,6 +24,14 @@
> #define CONFIG_SYS_MPUCLK 550
> #endif
>
> +/* 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
> +
> extern void pll_init(void);
> extern void enable_emif_clocks(void);
> extern void enable_dmm_clocks(void);
> diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
> index fdbe26c..6544931 100644
> --- a/board/ti/am335x/board.c
> +++ b/board/ti/am335x/board.c
> @@ -33,6 +33,8 @@
> #include <i2c.h>
> #include <miiphy.h>
> #include <cpsw.h>
> +#include <power/tps65217.h>
> +#include <power/tps65910.h>
> #include "board.h"
>
> DECLARE_GLOBAL_DATA_PTR;
> @@ -282,6 +284,159 @@ int spl_start_uboot(void)
> }
> #endif
>
> +void am33xx_spl_board_init(void)
> +{
> + int mpu_vdd, mpu_pll, sil_rev;
> +
> + /* Assume PG 1.0 */
> + mpu_pll = MPUPLL_M_720;
> +
> + sil_rev = readl(&cdev->deviceid) >> 28;
> + if (sil_rev == 1)
> + /* PG 2.0, efuse may not be set. */
> + mpu_pll = 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:
> + mpu_pll = MPUPLL_M_1000;
> + break;
> + case AM335X_ZCZ_800:
> + mpu_pll = MPUPLL_M_800;
> + break;
> + case AM335X_ZCZ_720:
> + mpu_pll = MPUPLL_M_720;
> + break;
> + case AM335X_ZCZ_600:
> + case AM335X_ZCE_600:
> + mpu_pll = MPUPLL_M_600;
> + break;
> + case AM335X_ZCZ_300:
> + case AM335X_ZCE_300:
> + mpu_pll = MPUPLL_M_300;
> + break;
> + }
> + }
> +
> + if (board_is_bone() || board_is_bone_lt()) {
> + /* BeagleBone PMIC Code */
> + int usb_cur_lim;
> +
> + /*
> + * Only perform PMIC configurations if board rev > A1
> + * on Beaglebone White
> + */
> + if (board_is_bone() && !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()) {
> + uchar pmic_status_reg;
> + if (tps65217_reg_read(STATUS, &pmic_status_reg))
> + return;
> + if (!(pmic_status_reg & PWR_SRC_AC_BITMASK)) {
> + puts("No AC power, disabling frequency switch\n");
> + return;
> + }
> + }
> +
> + /*
> + * Increase USB current limit to 1300mA or 1800mA and set
> + * the MPU voltage controller as needed.
> + */
> + if (mpu_pll == MPUPLL_M_1000) {
> + usb_cur_lim = USB_INPUT_CUR_LIMIT_1800MA;
> + mpu_vdd = DCDC_VOLT_SEL_1325MV;
> + } else {
> + usb_cur_lim = USB_INPUT_CUR_LIMIT_1300MA;
> + mpu_vdd = DCDC_VOLT_SEL_1275MV;
> + }
> +
> + if (tps65217_reg_write(PROT_LEVEL_NONE, POWER_PATH,
> + usb_cur_lim, USB_INPUT_CUR_LIMIT_MASK))
> + printf("tps65217_reg_write failure\n");

puts("...") when we don't have format characters, thanks.

> +
> +
> + /* Set DCDC2 (MPU) voltage */
> + if (tps65217_voltage_update(DEFDCDC2, mpu_vdd)) {
> + printf("tps65217_voltage_update failure\n");

Same as above

> + return;
> + }
> +
> + /* Set LDO3, LDO4 output voltage to 3.3V */
> + if (tps65217_reg_write(PROT_LEVEL_2, DEFLS1,
> + LDO_VOLTAGE_OUT_3_3, LDO_MASK))
> + printf("tps65217_reg_write failure\n");

Same as above

> +
> + if (tps65217_reg_write(PROT_LEVEL_2, DEFLS2,
> + LDO_VOLTAGE_OUT_3_3, LDO_MASK))
> + printf("tps65217_reg_write failure\n");

Same as above

> + } else {
> + uchar buf[4];
> +
> + /*
> + * 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;
> +
> + /* VDD1/2 voltage selection register access by control i/f */
> + if (i2c_read(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1,
> + buf, 1))

Would it not be better to have an API in the pmic driver file that you can call to access the pmic
instead of calling the pmic explicitly?

> + return;
> +
> + buf[0] |= TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C;
> +
> + if (i2c_write(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1,
> + buf, 1))

Would it not be better to have an API in the pmic driver file that you can call to access the pmic
instead of calling the pmic explicitly?

> + return;
> +
> + /* Depending on MPU clock we need different MPU VDD */
> +
> + /* Default to PG1.0/PG2.0 values. */
> + mpu_vdd = TPS65910_OP_REG_SEL_1_1_3;
> +
> + if (sil_rev >= 2) {
> + switch (mpu_pll) {
> + case MPUPLL_M_1000:
> + mpu_vdd = TPS65910_OP_REG_SEL_1_3_2_5;
> + break;
> + case MPUPLL_M_800:
> + mpu_vdd = TPS65910_OP_REG_SEL_1_2_6;
> + break;
> + case MPUPLL_M_720:
> + mpu_vdd = TPS65910_OP_REG_SEL_1_2_0;
> + break;
> + case MPUPLL_M_600:
> + case MPUPLL_M_300:
> + mpu_vdd = TPS65910_OP_REG_SEL_1_1_3;
> + break;
> + }
> + }
> +
> + /* 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 */
> + mpu_pll_config_val(mpu_pll);
> +}
> #endif
>
> /*
> diff --git a/include/configs/am335x_evm.h b/include/configs/am335x_evm.h
> index c5a6d4b..60c87a3 100644
> --- a/include/configs/am335x_evm.h
> +++ b/include/configs/am335x_evm.h
> @@ -289,6 +289,9 @@
> #define CONFIG_SYS_I2C_EEPROM_ADDR_LEN 2
> #define CONFIG_SYS_I2C_MULTI_EEPROMS
>
> +#define CONFIG_POWER_TPS65217
> +#define CONFIG_POWER_TPS65910
> +
> #define CONFIG_OMAP_GPIO
>
> #define CONFIG_BAUDRATE 115200
> @@ -352,6 +355,7 @@
> #define CONFIG_SPL_LIBCOMMON_SUPPORT
> #define CONFIG_SPL_LIBDISK_SUPPORT
> #define CONFIG_SPL_LIBGENERIC_SUPPORT
> +#define CONFIG_SPL_POWER_SUPPORT
> #define CONFIG_SPL_SERIAL_SUPPORT
> #define CONFIG_SPL_GPIO_SUPPORT
> #define CONFIG_SPL_YMODEM_SUPPORT

--
------------------
Dan Murphy