diff options
| author | Nikita Shubin <n.shubin@yadro.com> | 2021-11-10 12:42:30 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-11-12 10:29:20 +0530 |
| commit | f3744967c6b595c0caba164468b4b32b9c027dfd (patch) | |
| tree | 16b52e6d6cfba7dc5fbacd39fa28136d535a4d3b | |
| parent | 13a1158d24f6462ecf17d63e0c2325994180deac (diff) | |
platform: sifive_fu740: add platform reset driver
da9063 PMIC can be used to reset/shutdown the
Sifive Unmatched board.
shutdown is done simply by writing SHUTDOWN bit to
DA9063_REG_CONTROL_F register.
reset via setting WAKEUP bit in DA9063_REG_CONTROL_F
register followed by masking POWER and POWER1 domains
and setting STANDBY bit in DA9063_REG_CONTROL_A,
originally discovered by Alexandre Ghiti on linux-riscv
maillists.
Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Tested-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
| -rw-r--r-- | platform/generic/sifive_fu740.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/platform/generic/sifive_fu740.c b/platform/generic/sifive_fu740.c index c8325d3..3152152 100644 --- a/platform/generic/sifive_fu740.c +++ b/platform/generic/sifive_fu740.c @@ -2,14 +2,191 @@ * 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_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_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_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_shutdown(struct i2c_adapter *adap, uint32_t reg) +{ + int rc = i2c_adapter_reg_write(adap, da9063.reg, + DA9063_REG_PAGE_CON, 0x00); + + if (rc) + return rc; + + return i2c_adapter_reg_write(adap, da9063.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, da9063.reg, + DA9063_REG_PAGE_CON, 0x00); + + if (rc) + return rc; + + rc = i2c_adapter_reg_write(adap, da9063.reg, + DA9063_REG_CONTROL_F, + DA9063_CONTROL_F_WAKEUP); + if (rc) + return rc; + + return i2c_adapter_reg_write(adap, da9063.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_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) { @@ -23,6 +200,22 @@ static u64 sifive_fu740_tlbr_flush_limit(const struct fdt_match *match) 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" }, @@ -33,4 +226,5 @@ static const struct fdt_match sifive_fu740_match[] = { 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, }; |