[PATCH v4] platform: sifive_fu740: add platform reset driver
Nikita Shubin
nikita.shubin at maquefel.me
Wed Nov 10 01:42:30 PST 2021
From: Nikita Shubin <n.shubin at yadro.com>
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 at canonical.com>
Reviewed-by: Alexandre Ghiti <alexandre.ghiti at canonical.com>
Tested-by: Alexandre Ghiti <alexandre.ghiti at canonical.com>
Signed-off-by: Nikita Shubin <n.shubin at yadro.com>
---
v3->v4:
- moved all code to generic/sifive_fu740.c
---
platform/generic/sifive_fu740.c | 192 ++++++++++++++++++++++++++++++++
1 file changed, 192 insertions(+)
diff --git a/platform/generic/sifive_fu740.c b/platform/generic/sifive_fu740.c
index c8325d3..dde5926 100644
--- a/platform/generic/sifive_fu740.c
+++ b/platform/generic/sifive_fu740.c
@@ -2,14 +2,190 @@
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 SiFive
+ * Copyright (c) 2021 YADRO
*
* Authors:
* David Abdurachmanov <david.abdurachmanov at sifive.com>
+ * Nikita Shubin <n.shubin at 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;
+ }
+
+ while
+ (1);
+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 +199,21 @@ 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 *)
+{
+ 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 +224,5 @@ 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,
};
--
2.31.1
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