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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2021 SiFive
- * Copyright (c) 2021 YADRO
- *
- * Authors:
- * David Abdurachmanov <david.abdurachmanov@sifive.com>
- * Nikita Shubin <n.shubin@yadro.com>
- */
- #include <platform_override.h>
- #include <libfdt.h>
- #include <sbi/sbi_error.h>
- #include <sbi/sbi_hart.h>
- #include <sbi/sbi_system.h>
- #include <sbi/sbi_console.h>
- #include <sbi_utils/fdt/fdt_helper.h>
- #include <sbi_utils/fdt/fdt_fixup.h>
- #include <sbi_utils/reset/fdt_reset.h>
- #include <sbi_utils/i2c/fdt_i2c.h>
- #define DA9063_REG_PAGE_CON 0x00
- #define DA9063_REG_CONTROL_A 0x0e
- #define DA9063_REG_CONTROL_D 0x11
- #define DA9063_REG_CONTROL_F 0x13
- #define DA9063_REG_DEVICE_ID 0x81
- #define DA9063_CONTROL_A_M_POWER1_EN (1 << 6)
- #define DA9063_CONTROL_A_M_POWER_EN (1 << 5)
- #define DA9063_CONTROL_A_STANDBY (1 << 3)
- #define DA9063_CONTROL_D_TWDSCALE_MASK 0x07
- #define DA9063_CONTROL_F_WAKEUP (1 << 2)
- #define DA9063_CONTROL_F_SHUTDOWN (1 << 1)
- #define PMIC_CHIP_ID_DA9063 0x61
- static struct {
- struct i2c_adapter *adapter;
- uint32_t reg;
- } da9063;
- static int da9063_system_reset_check(u32 type, u32 reason)
- {
- switch (type) {
- case SBI_SRST_RESET_TYPE_SHUTDOWN:
- return 1;
- case SBI_SRST_RESET_TYPE_COLD_REBOOT:
- case SBI_SRST_RESET_TYPE_WARM_REBOOT:
- return 255;
- }
- return 0;
- }
- static inline int da9063_sanity_check(struct i2c_adapter *adap, uint32_t reg)
- {
- uint8_t val;
- int rc = i2c_adapter_reg_write(adap, reg, DA9063_REG_PAGE_CON, 0x02);
- if (rc)
- return rc;
- /* check set page*/
- rc = i2c_adapter_reg_read(adap, reg, 0x0, &val);
- if (rc)
- return rc;
- if (val != 0x02)
- return SBI_ENODEV;
- /* read and check device id */
- rc = i2c_adapter_reg_read(adap, reg, DA9063_REG_DEVICE_ID, &val);
- if (rc)
- return rc;
- if (val != PMIC_CHIP_ID_DA9063)
- return SBI_ENODEV;
- return 0;
- }
- static inline int da9063_stop_watchdog(struct i2c_adapter *adap, uint32_t reg)
- {
- uint8_t val;
- int rc = i2c_adapter_reg_write(adap, reg,
- DA9063_REG_PAGE_CON, 0x00);
- if (rc)
- return rc;
- rc = i2c_adapter_reg_read(adap, reg, DA9063_REG_CONTROL_D, &val);
- if (rc)
- return rc;
- if ((val & DA9063_CONTROL_D_TWDSCALE_MASK) == 0)
- return 0;
- val &= ~DA9063_CONTROL_D_TWDSCALE_MASK;
- return i2c_adapter_reg_write(adap, reg, DA9063_REG_CONTROL_D, val);
- }
- static inline int da9063_shutdown(struct i2c_adapter *adap, uint32_t reg)
- {
- int rc = i2c_adapter_reg_write(adap, reg,
- DA9063_REG_PAGE_CON, 0x00);
- if (rc)
- return rc;
- return i2c_adapter_reg_write(adap, reg,
- DA9063_REG_CONTROL_F,
- DA9063_CONTROL_F_SHUTDOWN);
- }
- static inline int da9063_reset(struct i2c_adapter *adap, uint32_t reg)
- {
- int rc = i2c_adapter_reg_write(adap, reg,
- DA9063_REG_PAGE_CON, 0x00);
- if (rc)
- return rc;
- rc = i2c_adapter_reg_write(adap, reg,
- DA9063_REG_CONTROL_F,
- DA9063_CONTROL_F_WAKEUP);
- if (rc)
- return rc;
- return i2c_adapter_reg_write(adap, reg,
- DA9063_REG_CONTROL_A,
- DA9063_CONTROL_A_M_POWER1_EN |
- DA9063_CONTROL_A_M_POWER_EN |
- DA9063_CONTROL_A_STANDBY);
- }
- static void da9063_system_reset(u32 type, u32 reason)
- {
- struct i2c_adapter *adap = da9063.adapter;
- uint32_t reg = da9063.reg;
- int rc;
- if (adap) {
- /* sanity check */
- rc = da9063_sanity_check(adap, reg);
- if (rc) {
- sbi_printf("%s: chip is not da9063 PMIC\n", __func__);
- goto skip_reset;
- }
- switch (type) {
- case SBI_SRST_RESET_TYPE_SHUTDOWN:
- da9063_shutdown(adap, reg);
- break;
- case SBI_SRST_RESET_TYPE_COLD_REBOOT:
- case SBI_SRST_RESET_TYPE_WARM_REBOOT:
- da9063_stop_watchdog(adap, reg);
- da9063_reset(adap, reg);
- break;
- }
- }
- skip_reset:
- sbi_hart_hang();
- }
- static struct sbi_system_reset_device da9063_reset_i2c = {
- .name = "da9063-reset",
- .system_reset_check = da9063_system_reset_check,
- .system_reset = da9063_system_reset
- };
- static int da9063_reset_init(void *fdt, int nodeoff,
- const struct fdt_match *match)
- {
- int rc, i2c_bus;
- struct i2c_adapter *adapter;
- uint64_t addr;
- /* we are dlg,da9063 node */
- rc = fdt_get_node_addr_size(fdt, nodeoff, 0, &addr, NULL);
- if (rc)
- return rc;
- da9063.reg = addr;
- /* find i2c bus parent node */
- i2c_bus = fdt_parent_offset(fdt, nodeoff);
- if (i2c_bus < 0)
- return i2c_bus;
- /* i2c adapter get */
- rc = fdt_i2c_adapter_get(fdt, i2c_bus, &adapter);
- if (rc)
- return rc;
- da9063.adapter = adapter;
- sbi_system_reset_add_device(&da9063_reset_i2c);
- return 0;
- }
- static const struct fdt_match da9063_reset_match[] = {
- { .compatible = "dlg,da9063", .data = (void *)true },
- { },
- };
- struct fdt_reset fdt_reset_da9063 = {
- .match_table = da9063_reset_match,
- .init = da9063_reset_init,
- };
- static u64 sifive_fu740_tlbr_flush_limit(const struct fdt_match *match)
- {
- /*
- * Needed to address CIP-1200 errata on SiFive FU740
- * Title: Instruction TLB can fail to respect a non-global SFENCE
- * Workaround: Flush the TLB using SFENCE.VMA x0, x0
- * See Errata_FU740-C000_20210205 from
- * https://www.sifive.com/boards/hifive-unmatched
- */
- return 0;
- }
- static int sifive_fu740_final_init(bool cold_boot,
- const struct fdt_match *match)
- {
- int rc;
- void *fdt = fdt_get_address();
- if (cold_boot) {
- rc = fdt_reset_driver_init(fdt, &fdt_reset_da9063);
- if (rc)
- sbi_printf("%s: failed to find da9063 for reset\n",
- __func__);
- }
- return 0;
- }
- static const struct fdt_match sifive_fu740_match[] = {
- { .compatible = "sifive,fu740" },
- { .compatible = "sifive,fu740-c000" },
- { .compatible = "sifive,hifive-unmatched-a00" },
- { },
- };
- const struct platform_override sifive_fu740 = {
- .match_table = sifive_fu740_match,
- .tlbr_flush_limit = sifive_fu740_tlbr_flush_limit,
- .final_init = sifive_fu740_final_init,
- };
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