[PATCH v2 5/5] lib: utils/reset: Add generic da9063 reset driver
Nikita Shubin
nikita.shubin at maquefel.me
Fri Oct 15 06:19:25 PDT 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.
Signed-off-by: Nikita Shubin <n.shubin at yadro.com>
---
v1 -> v2:
- changed to sub dts node da9063-reset instead of relying on dlg,da9063
- added priority dts node
- return priority system_reset_check either readed from dts or default 1
---
lib/utils/reset/fdt_reset.c | 2 +
lib/utils/reset/fdt_reset_da9063.c | 214 +++++++++++++++++++++++++++++
lib/utils/reset/objects.mk | 1 +
3 files changed, 217 insertions(+)
create mode 100644 lib/utils/reset/fdt_reset_da9063.c
diff --git a/lib/utils/reset/fdt_reset.c b/lib/utils/reset/fdt_reset.c
index 168bb0c..92f37b0 100644
--- a/lib/utils/reset/fdt_reset.c
+++ b/lib/utils/reset/fdt_reset.c
@@ -18,6 +18,7 @@ extern struct fdt_reset fdt_reset_htif;
extern struct fdt_reset fdt_reset_sifive_test;
extern struct fdt_reset fdt_reset_sunxi_wdt;
extern struct fdt_reset fdt_reset_thead;
+extern struct fdt_reset fdt_reset_da9063;
static struct fdt_reset *reset_drivers[] = {
&fdt_poweroff_gpio,
@@ -26,6 +27,7 @@ static struct fdt_reset *reset_drivers[] = {
&fdt_reset_sifive_test,
&fdt_reset_sunxi_wdt,
&fdt_reset_thead,
+ &fdt_reset_da9063,
};
int fdt_reset_init(void)
diff --git a/lib/utils/reset/fdt_reset_da9063.c b/lib/utils/reset/fdt_reset_da9063.c
new file mode 100644
index 0000000..e3c9ced
--- /dev/null
+++ b/lib/utils/reset/fdt_reset_da9063.c
@@ -0,0 +1,214 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 YADRO
+ *
+ * Authors:
+ * Nikita Shubin <nshubin at yadro.com>
+ */
+
+#include <libfdt.h>
+#include <sbi/sbi_error.h>
+#include <sbi/sbi_console.h>
+#include <sbi/sbi_ecall_interface.h>
+#include <sbi/sbi_hart.h>
+#include <sbi/sbi_system.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/i2c/fdt_i2c.h>
+#include <sbi_utils/reset/fdt_reset.h>
+
+#define DA9063_REG_PAGE_CON 0x00
+#define DA9063_REG_CONTROL_A 0x0e
+#define DA9063_REG_CONTROL_C 0x10
+#define DA9063_REG_CONTROL_F 0x13
+#define DA9063_REG_DEVICE_ID 0x81
+
+#define DA9063_CONTROL_A_CP_EN (1 << 7)
+#define DA9063_CONTROL_A_M_POWER1_EN (1 << 6)
+#define DA9063_CONTROL_A_M_POWER_EN (1 << 5)
+#define DA9063_CONTROL_A_M_SYSTEM_EN (1 << 4)
+#define DA9063_CONTROL_A_STANDBY (1 << 3)
+#define DA9063_CONTROL_A_POWER1_EN (1 << 2)
+#define DA9063_CONTROL_A_POWER_EN (1 << 1)
+#define DA9063_CONTROL_A_SYSTEM_EN (1 << 0)
+
+#define DA9063_CONTROL_F_WAKEUP (1 << 2)
+#define DA9063_CONTROL_F_SHUTDOWN (1 << 1)
+#define DA9063_CONTROL_F_WATCHDOG (1 << 0)
+
+#define DA9063_CONTROL_C_DEF_SUPPLY (1 << 7)
+#define DA9063_CONTROL_C_SLEW_RATE (1 << 4)
+#define DA9063_CONTROL_C_OTPREAD_EN (1 << 3)
+#define DA9063_CONTROL_C_AUTO_BOOT (1 << 2)
+#define DA9063_CONTROL_C_DEBOUNCING (1 << 0)
+
+#define PMIC_CHIP_ID_DA9063 0x61
+
+static struct {
+ struct i2c_adapter *adapter;
+ uint32_t reg;
+ u8 priority;
+} da9063 = {
+ .priority = 1
+};
+
+static int da9063_system_reset_check(u32 type, u32 reason)
+{
+ switch (type) {
+ case SBI_SRST_RESET_TYPE_SHUTDOWN:
+ case SBI_SRST_RESET_TYPE_COLD_REBOOT:
+ case SBI_SRST_RESET_TYPE_WARM_REBOOT:
+ return da9063.priority;
+ }
+
+ return 0;
+}
+
+static inline int da9063_sanity_check(struct i2c_adapter *adap, uint32_t reg)
+{
+ uint8_t val;
+ int rc = i2c_adapter_smbus_reg_write(adap, reg, DA9063_REG_PAGE_CON, 0x02);
+
+ if (rc)
+ return rc;
+
+ /* check set page*/
+ rc = i2c_adapter_smbus_reg_read(adap, reg, 0x0, &val);
+ if (rc)
+ return rc;
+
+ if (val != 0x02)
+ return SBI_ENODEV;
+
+ /* read and check device id */
+ rc = i2c_adapter_smbus_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_smbus_reg_write(adap, da9063.reg,
+ DA9063_REG_PAGE_CON, 0x00);
+
+ if (rc)
+ return rc;
+
+ return i2c_adapter_smbus_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_smbus_reg_write(adap, da9063.reg,
+ DA9063_REG_PAGE_CON, 0x00);
+
+ if (rc)
+ return rc;
+
+ rc = i2c_adapter_smbus_reg_write(adap, da9063.reg,
+ DA9063_REG_CONTROL_F, DA9063_CONTROL_F_WAKEUP);
+ if (rc)
+ return rc;
+
+ return i2c_adapter_smbus_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) {
+ /* may include clock init */
+ i2c_adapter_configure(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_dev, i2c_bus, len;
+ const fdt32_t *val;
+ struct i2c_adapter *adapter;
+ uint64_t addr;
+
+ /* find dlg,da9063 parent node */
+ i2c_dev = fdt_parent_offset(fdt, nodeoff);
+ if (i2c_dev < 0)
+ return i2c_dev;
+
+ rc = fdt_get_node_addr_size(fdt, i2c_dev, 0, &addr, NULL);
+ if (rc)
+ return rc;
+
+ da9063.reg = addr;
+ val = fdt_getprop(fdt, nodeoff, "priority", &len);
+ if (len > 0)
+ da9063.priority = fdt32_to_cpu(*val);
+
+ /* find i2c bus parent node */
+ i2c_bus = fdt_parent_offset(fdt, i2c_dev);
+ 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 = "da9063-reset", .data = (void *)TRUE },
+ { },
+};
+
+struct fdt_reset fdt_reset_da9063 = {
+ .match_table = da9063_reset_match,
+ .init = da9063_reset_init,
+};
diff --git a/lib/utils/reset/objects.mk b/lib/utils/reset/objects.mk
index 6c95db3..cfe4c09 100644
--- a/lib/utils/reset/objects.mk
+++ b/lib/utils/reset/objects.mk
@@ -14,3 +14,4 @@ libsbiutils-objs-y += reset/fdt_reset_sifive_test.o
libsbiutils-objs-y += reset/fdt_reset_sunxi_wdt.o
libsbiutils-objs-y += reset/fdt_reset_thead.o
libsbiutils-objs-y += reset/fdt_reset_thead_asm.o
+libsbiutils-objs-y += reset/fdt_reset_da9063.o
--
2.31.1
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