acpi: Add support for a generic power sequence

Add a way for devices to enable and disable themselves using ACPI code
that updates GPIOs. This takes several timing parameters and supports
enable, reset and stop.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h
index 62b1295..e7db7bf 100644 (file)
--- a/include/acpi/acpi_device.h
+++ b/include/acpi/acpi_device.h
@@ -342,4 +342,46 @@ int acpi_device_write_i2c_dev(struct acpi_ctx *ctx, const struct udevice *dev);
  */
 int acpi_device_write_spi_dev(struct acpi_ctx *ctx, const struct udevice *dev);
 
+/**
+ * acpi_device_add_power_res() - Add a basic PowerResource block for a device
+ *
+ * This includes GPIOs to control enable, reset and stop operation of the
+ * device. Each GPIO is optional, but at least one must be provided.
+ * This can be applied to any device that has power control, so is fairly
+ * generic.
+ *
+ * Reset - Put the device into / take the device out of reset.
+ * Enable - Enable / disable power to device.
+ * Stop - Stop / start operation of device.
+ *
+ * @ctx: ACPI context pointer
+ * @tx_state_val: Mask to use to toggle the TX state on the GPIO pin, e,g.
+ *     PAD_CFG0_TX_STATE
+ * @dw0_read: Name to use to read dw0, e.g. "\\_SB.GPC0"
+ * @dw0_write: Name to use to read dw0, e.g. "\\_SB.SPC0"
+ * @reset_gpio: GPIO used to take device out of reset or to put it into reset
+ * @reset_delay_ms: Delay to be inserted after device is taken out of reset
+ *     (_ON method delay)
+ * @reset_off_delay_ms: Delay to be inserted after device is put into reset
+ *     (_OFF method delay)
+ * @enable_gpio: GPIO used to enable device
+ * @enable_delay_ms: Delay to be inserted after device is enabled
+ * @enable_off_delay_ms: Delay to be inserted after device is disabled
+ *     (_OFF method delay)
+ * @stop_gpio: GPIO used to stop operation of device
+ * @stop_delay_ms: Delay to be inserted after disabling stop (_ON method delay)
+ * @stop_off_delay_ms: Delay to be inserted after enabling stop.
+ *     (_OFF method delay)
+ *
+ * @return 0 if OK, -ve if at least one GPIO is not provided
+ */
+int acpi_device_add_power_res(struct acpi_ctx *ctx, u32 tx_state_val,
+                             const char *dw0_read, const char *dw0_write,
+                             const struct gpio_desc *reset_gpio,
+                             uint reset_delay_ms, uint reset_off_delay_ms,
+                             const struct gpio_desc *enable_gpio,
+                             uint enable_delay_ms, uint enable_off_delay_ms,
+                             const struct gpio_desc *stop_gpio,
+                             uint stop_delay_ms, uint stop_off_delay_ms);
+
 #endif

diff --git a/lib/acpi/acpi_device.c b/lib/acpi/acpi_device.c
index b628fa1..c66cafc 100644 (file)
--- a/lib/acpi/acpi_device.c
+++ b/lib/acpi/acpi_device.c
@@ -386,6 +386,105 @@ int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx,
        return pin;
 }
 
+/* PowerResource() with Enable and/or Reset control */
+int acpi_device_add_power_res(struct acpi_ctx *ctx, u32 tx_state_val,
+                             const char *dw0_read, const char *dw0_write,
+                             const struct gpio_desc *reset_gpio,
+                             uint reset_delay_ms, uint reset_off_delay_ms,
+                             const struct gpio_desc *enable_gpio,
+                             uint enable_delay_ms, uint enable_off_delay_ms,
+                             const struct gpio_desc *stop_gpio,
+                             uint stop_delay_ms, uint stop_off_delay_ms)
+{
+       static const char *const power_res_dev_states[] = { "_PR0", "_PR3" };
+       struct acpi_gpio reset, enable, stop;
+       bool has_reset, has_enable, has_stop;
+       int ret;
+
+       gpio_get_acpi(reset_gpio, &reset);
+       gpio_get_acpi(enable_gpio, &enable);
+       gpio_get_acpi(stop_gpio, &stop);
+       has_reset = reset.pins[0];
+       has_enable = enable.pins[0];
+       has_stop = stop.pins[0];
+
+       if (!has_reset && !has_enable && !has_stop)
+               return -EINVAL;
+
+       /* PowerResource (PRIC, 0, 0) */
+       acpigen_write_power_res(ctx, "PRIC", 0, 0, power_res_dev_states,
+                               ARRAY_SIZE(power_res_dev_states));
+
+       /* Method (_STA, 0, NotSerialized) { Return (0x1) } */
+       acpigen_write_sta(ctx, 0x1);
+
+       /* Method (_ON, 0, Serialized) */
+       acpigen_write_method_serialized(ctx, "_ON", 0);
+       if (reset_gpio) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &reset, true);
+               if (ret)
+                       return log_msg_ret("reset1", ret);
+       }
+       if (has_enable) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &enable, true);
+               if (ret)
+                       return log_msg_ret("enable1", ret);
+               if (enable_delay_ms)
+                       acpigen_write_sleep(ctx, enable_delay_ms);
+       }
+       if (has_reset) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &reset, false);
+               if (ret)
+                       return log_msg_ret("reset2", ret);
+               if (reset_delay_ms)
+                       acpigen_write_sleep(ctx, reset_delay_ms);
+       }
+       if (has_stop) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &stop, false);
+               if (ret)
+                       return log_msg_ret("stop1", ret);
+               if (stop_delay_ms)
+                       acpigen_write_sleep(ctx, stop_delay_ms);
+       }
+       acpigen_pop_len(ctx);           /* _ON method */
+
+       /* Method (_OFF, 0, Serialized) */
+       acpigen_write_method_serialized(ctx, "_OFF", 0);
+       if (has_stop) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &stop, true);
+               if (ret)
+                       return log_msg_ret("stop2", ret);
+               if (stop_off_delay_ms)
+                       acpigen_write_sleep(ctx, stop_off_delay_ms);
+       }
+       if (has_reset) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &reset, true);
+               if (ret)
+                       return log_msg_ret("reset3", ret);
+               if (reset_off_delay_ms)
+                       acpigen_write_sleep(ctx, reset_off_delay_ms);
+       }
+       if (has_enable) {
+               ret = acpigen_set_enable_tx_gpio(ctx, tx_state_val, dw0_read,
+                                                dw0_write, &enable, false);
+               if (ret)
+                       return log_msg_ret("enable2", ret);
+               if (enable_off_delay_ms)
+                       acpigen_write_sleep(ctx, enable_off_delay_ms);
+       }
+       acpigen_pop_len(ctx);           /* _OFF method */
+
+       acpigen_pop_len(ctx);           /* PowerResource PRIC */
+
+       return 0;
+}
+
 /* ACPI 6.3 section 6.4.3.8.2.1 - I2cSerialBus() */
 static void acpi_device_write_i2c(struct acpi_ctx *ctx,
                                  const struct acpi_i2c *i2c)

diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c
index 9b699fc..9e7a928 100644 (file)
--- a/test/dm/acpigen.c
+++ b/test/dm/acpigen.c
@@ -806,3 +806,71 @@ static int dm_test_acpi_gpio_toggle(struct unit_test_state *uts)
        return 0;
 }
 DM_TEST(dm_test_acpi_gpio_toggle, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test writing ACPI code to output power-sequence info */
+static int dm_test_acpi_power_seq(struct unit_test_state *uts)
+{
+       struct gpio_desc reset, enable, stop;
+       const uint addr = 0xc00dc, addr_act_low = 0x80012;
+       const int txbit = BIT(2);
+       struct acpi_ctx *ctx;
+       struct udevice *dev;
+       u8 *ptr;
+
+       ut_assertok(acpi_test_alloc_context_size(&ctx, 400));
+
+       ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));
+       ut_asserteq_str("a-test", dev->name);
+       ut_assertok(gpio_request_by_name(dev, "test2-gpios", 0, &reset, 0));
+       ut_assertok(gpio_request_by_name(dev, "test2-gpios", 1, &enable, 0));
+       ut_assertok(gpio_request_by_name(dev, "test2-gpios", 2, &stop, 0));
+       ptr = acpigen_get_current(ctx);
+
+       ut_assertok(acpi_device_add_power_res(ctx, txbit, "\\_SB.GPC0",
+                                             "\\_SB.SPC0", &reset, 2, 3,
+                                             &enable, 4, 5, &stop, 6, 7));
+       ut_asserteq(0x186, acpigen_get_current(ctx) - ptr);
+       ut_asserteq_strn("PRIC", (char *)ptr + 0x18);
+
+       /* First the 'ON' sequence - spot check */
+       ut_asserteq_strn("_ON_", (char *)ptr + 0x38);
+
+       /* reset set */
+       ut_asserteq(addr + reset.offset, get_unaligned((u32 *)(ptr + 0x49)));
+       ut_asserteq(OR_OP, ptr[0x52]);
+
+       /* enable set */
+       ut_asserteq(addr + enable.offset, get_unaligned((u32 *)(ptr + 0x72)));
+       ut_asserteq(OR_OP, ptr[0x7b]);
+
+       /* reset clear */
+       ut_asserteq(addr + reset.offset, get_unaligned((u32 *)(ptr + 0x9f)));
+       ut_asserteq(NOT_OP, ptr[0xa8]);
+
+       /* stop set (disable, active low) */
+       ut_asserteq(addr_act_low + stop.offset,
+                   get_unaligned((u32 *)(ptr + 0xcf)));
+       ut_asserteq(OR_OP, ptr[0xd8]);
+
+       /* Now the 'OFF' sequence */
+       ut_asserteq_strn("_OFF", (char *)ptr + 0xf4);
+
+       /* stop clear (enable, active low) */
+       ut_asserteq(addr_act_low + stop.offset,
+                   get_unaligned((u32 *)(ptr + 0x105)));
+       ut_asserteq(NOT_OP, ptr[0x10e]);
+
+       /* reset clear */
+       ut_asserteq(addr + reset.offset, get_unaligned((u32 *)(ptr + 0x135)));
+       ut_asserteq(OR_OP, ptr[0x13e]);
+
+       /* enable clear */
+       ut_asserteq(addr + enable.offset, get_unaligned((u32 *)(ptr + 0x162)));
+       ut_asserteq(NOT_OP, ptr[0x16b]);
+
+       free_context(&ctx);
+
+       return 0;
+}
+
+DM_TEST(dm_test_acpi_power_seq, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);