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-rw-r--r--plat/brcm/board/stingray/driver/swreg.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/plat/brcm/board/stingray/driver/swreg.c b/plat/brcm/board/stingray/driver/swreg.c
new file mode 100644
index 0000000..a5b5b9f
--- /dev/null
+++ b/plat/brcm/board/stingray/driver/swreg.c
@@ -0,0 +1,375 @@
+/*
+ * Copyright (c) 2017 - 2020, Broadcom
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <lib/mmio.h>
+
+#include <sr_utils.h>
+#include <swreg.h>
+
+#define MIN_VOLT 760000
+#define MAX_VOLT 1060000
+
+#define BSTI_WRITE 0x1
+#define BSTI_READ 0x2
+#define BSTI_COMMAND_TA 0x2
+#define BSTI_COMMAND_DATA 0xFF
+#define BSTI_CONTROL_VAL 0x81
+#define BSTI_CONTROL_BUSY 0x100
+#define BSTI_TOGGLE_BIT 0x2
+#define BSTI_CONFI_DONE_MASK 0xFFFFFFFD
+#define BSTI_REG_DATA_MASK 0xFFFF
+#define BSTI_CMD(sb, op, pa, ra, ta, data) \
+ ((((sb) & 0x3) << 30) | (((op) & 0x3) << 28) | \
+ (((pa) & 0x1F) << 23) | (((ra) & 0x1F) << 18) | \
+ (((ta) & 0x3) << 16) | (data))
+
+#define PHY_REG0 0x0
+#define PHY_REG1 0x1
+#define PHY_REG4 0x4
+#define PHY_REG5 0x5
+#define PHY_REG6 0x6
+#define PHY_REG7 0x7
+#define PHY_REGC 0xc
+
+#define IHOST_VDDC_DATA 0x560
+#define DDR_CORE_DATA 0x2560
+#define UPDATE_POS_EDGE(data, set) ((data) | ((set) << 1))
+
+/*
+ * Formula for SR A2 reworked board:
+ * step = ((vol/(1.4117 * 0.98)) - 500000)/3125
+ * where,
+ * vol - input voltage
+ * 500000 - Reference voltage
+ * 3125 - one step value
+ */
+#define A2_VOL_REF 500000
+#define ONE_STEP_VALUE 3125
+#define VOL_DIV(vol) (((vol*10000ull)/(14117*98ull)) * 100ull)
+#define STEP_VALUE(vol) \
+ ((((((VOL_DIV(vol)) - A2_VOL_REF) / ONE_STEP_VALUE) & 0xFF) << 8) | 4)
+
+#define B0_VOL_REF ((500000/100)*98)
+#define B0_ONE_STEP_VALUE 3125
+/*
+ * Formula for SR B0 chip for IHOST12/03 and VDDC_CORE
+ * step = ((vol/1.56) - (500000 * 0.98))/3125
+ * where,
+ * vol - input voltage
+ * 500000 - Reference voltage
+ * 3125 - one step value
+ */
+#define B0_VOL_DIV(vol) (((vol)*100ull)/156)
+#define B0_STEP_VALUE(vol) \
+ ((((((B0_VOL_DIV(vol)) - B0_VOL_REF) / B0_ONE_STEP_VALUE) \
+ & 0xFF) << 8) | 4)
+
+/*
+ * Formula for SR B0 chip for DDR-CORE
+ * step = ((vol/1) - (500000 * 0.98))/3125
+ * where,
+ * vol - input voltage
+ * 500000 - Reference voltage
+ * 3125 - one step value
+ */
+#define B0_DDR_VDDC_VOL_DIV(vol) ((vol)/1)
+#define B0_DDR_VDDC_STEP_VALUE(vol) \
+ ((((((B0_DDR_VDDC_VOL_DIV(vol)) - B0_VOL_REF) / B0_ONE_STEP_VALUE) \
+ & 0xFF) << 8) | 4)
+
+#define MAX_SWREG_CNT 8
+#define MAX_ADDR_PER_SWREG 16
+#define MAX_REG_ADDR 0xF
+#define MIN_REG_ADDR 0x0
+
+static const char *sw_reg_name[MAX_SWREG_CNT] = {
+ "DDR_VDDC",
+ "IHOST03",
+ "IHOST12",
+ "IHOST_ARRAY",
+ "DDRIO_SLAVE",
+ "VDDC_CORE",
+ "VDDC1",
+ "DDRIO_MASTER"
+};
+
+/* firmware values for all SWREG for 3.3V input operation */
+static const uint16_t swreg_fm_data_bx[MAX_SWREG_CNT][MAX_ADDR_PER_SWREG] = {
+ /* DDR logic: Power Domains independent of 12v or 3p3v */
+ {0x25E0, 0x2D54, 0x0EC6, 0x01EC, 0x28BB, 0x1144, 0x0200, 0x69C0,
+ 0x0010, 0x0EDF, 0x90D7, 0x8000, 0x820C, 0x0003, 0x0001, 0x0000},
+
+ /* ihost03, 3p3V */
+ {0x05E0, 0x39E5, 0x03C1, 0x007C, 0x8BA9, 0x4444, 0x3300, 0x6B80,
+ 0x003F, 0x0FFF, 0x90D7, 0x8000, 0x240C, 0x0003, 0x0001, 0x0000},
+
+ /* ihost12 3p3v */
+ {0x05E0, 0x39E5, 0x03C1, 0x007C, 0x8BA9, 0x4444, 0x3300, 0x6B80,
+ 0x003F, 0x0FFF, 0x90D7, 0x8000, 0x240C, 0x0003, 0x0001, 0x0000},
+
+ /* ihost array */
+ {0x25E0, 0x2D94, 0x0EC6, 0x01EC, 0x2ABB, 0x1144, 0x0340, 0x69C0,
+ 0x0010, 0x0EDF, 0x90D7, 0x8000, 0x860C, 0x0003, 0x0001, 0x0000},
+
+ /* ddr io slave : 3p3v */
+ {0x0560, 0x4438, 0x0000, 0x001F, 0x8028, 0x4444, 0x0300, 0x4380,
+ 0x003F, 0x0FFF, 0x10D7, 0x8000, 0xA70C, 0x0003, 0x0001, 0x0000},
+
+ /* core master 3p3v */
+ {0x05E0, 0x39E5, 0x03C1, 0x007C, 0x8BA9, 0x4444, 0x3300, 0x6B80,
+ 0x003F, 0x0FFF, 0x90D7, 0x8000, 0x240C, 0x0003, 0x0001, 0x0000},
+
+ /* core slave 3p3v */
+ {0x0560, 0x4438, 0x0000, 0x001F, 0x8028, 0x4444, 0x0300, 0x4380,
+ 0x003F, 0x0FFF, 0x10D7, 0x8000, 0x240C, 0x0003, 0x0001, 0x0000},
+
+ /* ddr io master : 3p3v */
+ {0x05E0, 0x39E5, 0x03C1, 0x007C, 0x8BA9, 0x4444, 0x3300, 0x6B80,
+ 0x003F, 0x0FFF, 0x90D7, 0x8000, 0xA70C, 0x0003, 0x0001, 0x0000},
+};
+
+#define FM_DATA swreg_fm_data_bx
+
+static int swreg_poll(void)
+{
+ uint32_t data;
+ int retry = 100;
+
+ do {
+ data = mmio_read_32(BSTI_CONTROL_OFFSET);
+ if ((data & BSTI_CONTROL_BUSY) != BSTI_CONTROL_BUSY)
+ return 0;
+ retry--;
+ udelay(1);
+ } while (retry > 0);
+
+ return -ETIMEDOUT;
+}
+
+static int write_swreg_config(enum sw_reg reg_id, uint32_t addr, uint32_t data)
+{
+ uint32_t cmd;
+ int ret;
+
+ cmd = BSTI_CMD(0x1, BSTI_WRITE, reg_id, addr, BSTI_COMMAND_TA, data);
+ mmio_write_32(BSTI_CONTROL_OFFSET, BSTI_CONTROL_VAL);
+ mmio_write_32(BSTI_COMMAND_OFFSET, cmd);
+ ret = swreg_poll();
+ if (ret) {
+ ERROR("Failed to write swreg %s addr 0x%x\n",
+ sw_reg_name[reg_id-1], addr);
+ return ret;
+ }
+ return ret;
+}
+
+static int read_swreg_config(enum sw_reg reg_id, uint32_t addr, uint32_t *data)
+{
+ uint32_t cmd;
+ int ret;
+
+ cmd = BSTI_CMD(0x1, BSTI_READ, reg_id, addr, BSTI_COMMAND_TA, PHY_REG0);
+ mmio_write_32(BSTI_CONTROL_OFFSET, BSTI_CONTROL_VAL);
+ mmio_write_32(BSTI_COMMAND_OFFSET, cmd);
+ ret = swreg_poll();
+ if (ret) {
+ ERROR("Failed to read swreg %s addr 0x%x\n",
+ sw_reg_name[reg_id-1], addr);
+ return ret;
+ }
+
+ *data = mmio_read_32(BSTI_COMMAND_OFFSET);
+ *data &= BSTI_REG_DATA_MASK;
+ return ret;
+}
+
+static int swreg_config_done(enum sw_reg reg_id)
+{
+ uint32_t read_data;
+ int ret;
+
+ ret = read_swreg_config(reg_id, PHY_REG0, &read_data);
+ if (ret)
+ return ret;
+
+ read_data &= BSTI_CONFI_DONE_MASK;
+ read_data |= BSTI_TOGGLE_BIT;
+ ret = write_swreg_config(reg_id, PHY_REG0, read_data);
+ if (ret)
+ return ret;
+
+ ret = read_swreg_config(reg_id, PHY_REG0, &read_data);
+ if (ret)
+ return ret;
+
+ read_data &= BSTI_CONFI_DONE_MASK;
+ ret = write_swreg_config(reg_id, PHY_REG0, read_data);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+
+#ifdef DUMP_SWREG
+static void dump_swreg_firmware(void)
+{
+ enum sw_reg reg_id;
+ uint32_t data;
+ int addr;
+ int ret;
+
+ for (reg_id = DDR_VDDC; reg_id <= DDRIO_MASTER; reg_id++) {
+ INFO("SWREG: %s\n", sw_reg_name[reg_id - 1]);
+ for (addr = MIN_REG_ADDR; addr <= MAX_REG_ADDR; addr++) {
+ ret = read_swreg_config(reg_id, addr, &data);
+ if (ret)
+ ERROR("Failed to read offset %d\n", addr);
+ INFO("\t0x%x: 0x%04x\n", addr, data);
+ }
+ }
+}
+#endif
+
+int set_swreg(enum sw_reg reg_id, uint32_t micro_volts)
+{
+ uint32_t step, programmed_step;
+ uint32_t data = IHOST_VDDC_DATA;
+ int ret;
+
+ if ((micro_volts > MAX_VOLT) || (micro_volts < MIN_VOLT)) {
+ ERROR("input voltage out-of-range\n");
+ ret = -EINVAL;
+ goto failed;
+ }
+
+ ret = read_swreg_config(reg_id, PHY_REGC, &programmed_step);
+ if (ret)
+ goto failed;
+
+ if (reg_id == DDR_VDDC)
+ step = B0_DDR_VDDC_STEP_VALUE(micro_volts);
+ else
+ step = B0_STEP_VALUE(micro_volts);
+
+ if ((step >> 8) != (programmed_step >> 8)) {
+ ret = write_swreg_config(reg_id, PHY_REGC, step);
+ if (ret)
+ goto failed;
+
+ if (reg_id == DDR_VDDC)
+ data = DDR_CORE_DATA;
+
+ ret = write_swreg_config(reg_id, PHY_REG0,
+ UPDATE_POS_EDGE(data, 1));
+ if (ret)
+ goto failed;
+
+ ret = write_swreg_config(reg_id, PHY_REG0,
+ UPDATE_POS_EDGE(data, 0));
+ if (ret)
+ goto failed;
+ }
+
+ INFO("%s voltage updated to %duV\n", sw_reg_name[reg_id-1],
+ micro_volts);
+ return ret;
+
+failed:
+ /*
+ * Stop booting if voltages are not set
+ * correctly. Booting will fail at random point
+ * if we continue with wrong voltage settings.
+ */
+ ERROR("Failed to set %s voltage to %duV\n", sw_reg_name[reg_id-1],
+ micro_volts);
+ assert(0);
+
+ return ret;
+}
+
+/* Update SWREG firmware for all power domain for A2 chip */
+int swreg_firmware_update(void)
+{
+ enum sw_reg reg_id;
+ uint32_t data;
+ int addr;
+ int ret;
+
+ /* write firmware values */
+ for (reg_id = DDR_VDDC; reg_id <= DDRIO_MASTER; reg_id++) {
+ /* write higher location first */
+ for (addr = MAX_REG_ADDR; addr >= MIN_REG_ADDR; addr--) {
+ ret = write_swreg_config(reg_id, addr,
+ FM_DATA[reg_id - 1][addr]);
+ if (ret)
+ goto exit;
+ }
+ }
+
+ /* trigger SWREG firmware update */
+ for (reg_id = DDR_VDDC; reg_id <= DDRIO_MASTER; reg_id++) {
+ /*
+ * Slave regulator doesn't have to be updated,
+ * Updating Master is enough
+ */
+ if ((reg_id == DDRIO_SLAVE) || (reg_id == VDDC1))
+ continue;
+
+ ret = swreg_config_done(reg_id);
+ if (ret) {
+ ERROR("Failed to trigger SWREG firmware update for %s\n"
+ , sw_reg_name[reg_id-1]);
+ return ret;
+ }
+ }
+
+ for (reg_id = DDR_VDDC; reg_id <= DDRIO_MASTER; reg_id++) {
+ /*
+ * IHOST_ARRAY will be used on some boards like STRATUS and
+ * there will not be any issue even if it is updated on other
+ * boards where it is not used.
+ */
+ if (reg_id == IHOST_ARRAY)
+ continue;
+
+ for (addr = MIN_REG_ADDR; addr <= MAX_REG_ADDR; addr++) {
+ ret = read_swreg_config(reg_id, addr, &data);
+ if (ret || (!ret &&
+ (data != FM_DATA[reg_id - 1][addr]))) {
+ ERROR("swreg fm update failed: %s at off %d\n",
+ sw_reg_name[reg_id - 1], addr);
+ ERROR("Read val: 0x%x, expected val: 0x%x\n",
+ data, FM_DATA[reg_id - 1][addr]);
+ return -1;
+ }
+ }
+ }
+
+ INFO("Updated SWREG firmware\n");
+
+#ifdef DUMP_SWREG
+ dump_swreg_firmware();
+#endif
+ return ret;
+
+exit:
+ /*
+ * Stop booting if swreg firmware update fails.
+ * Booting will fail at random point if we
+ * continue with wrong voltage settings.
+ */
+ ERROR("Failed to update firmware for %s SWREG\n",
+ sw_reg_name[reg_id-1]);
+ assert(0);
+
+ return ret;
+}
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