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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>
This commit is contained in:
Nikita Shubin 2021-11-10 12:42:30 +03:00 committed by Anup Patel
parent 13a1158d24
commit f3744967c6
1 changed files with 194 additions and 0 deletions
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194
platform/generic/sifive_fu740.c
View File

@ -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,
};