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-rw-r--r--lib/acpi/acpi_device.c823
1 files changed, 823 insertions, 0 deletions
diff --git a/lib/acpi/acpi_device.c b/lib/acpi/acpi_device.c
new file mode 100644
index 0000000000..3c75b6d962
--- /dev/null
+++ b/lib/acpi/acpi_device.c
@@ -0,0 +1,823 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generation of tables for particular device types
+ *
+ * Copyright 2019 Google LLC
+ * Mostly taken from coreboot file of the same name
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <irq.h>
+#include <log.h>
+#include <usb.h>
+#include <acpi/acpigen.h>
+#include <acpi/acpi_device.h>
+#include <acpi/acpigen.h>
+#include <asm-generic/gpio.h>
+#include <dm/acpi.h>
+
+/**
+ * acpi_device_path_fill() - Find the root device and build a path from there
+ *
+ * This recursively reaches back to the root device and progressively adds path
+ * elements until the device is reached.
+ *
+ * @dev: Device to return path of
+ * @buf: Buffer to hold the path
+ * @buf_len: Length of buffer
+ * @cur: Current position in the buffer
+ * @return new position in buffer after adding @dev, or -ve on error
+ */
+static int acpi_device_path_fill(const struct udevice *dev, char *buf,
+ size_t buf_len, int cur)
+{
+ char name[ACPI_NAME_MAX];
+ int next = 0;
+ int ret;
+
+ ret = acpi_get_name(dev, name);
+ if (ret)
+ return ret;
+
+ /*
+ * Make sure this name segment will fit, including the path segment
+ * separator and possible NULL terminator, if this is the last segment.
+ */
+ if (cur + strlen(name) + 2 > buf_len)
+ return -ENOSPC;
+
+ /* Walk up the tree to the root device */
+ if (dev_get_parent(dev)) {
+ next = acpi_device_path_fill(dev_get_parent(dev), buf, buf_len,
+ cur);
+ if (next < 0)
+ return next;
+ }
+
+ /* Fill in the path from the root device */
+ next += snprintf(buf + next, buf_len - next, "%s%s",
+ dev_get_parent(dev) && *name ? "." : "", name);
+
+ return next;
+}
+
+int acpi_device_path(const struct udevice *dev, char *buf, int maxlen)
+{
+ int ret;
+
+ ret = acpi_device_path_fill(dev, buf, maxlen, 0);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+int acpi_device_scope(const struct udevice *dev, char *scope, int maxlen)
+{
+ int ret;
+
+ if (!dev_get_parent(dev))
+ return log_msg_ret("noparent", -EINVAL);
+
+ ret = acpi_device_path_fill(dev_get_parent(dev), scope, maxlen, 0);
+ if (ret < 0)
+ return log_msg_ret("fill", ret);
+
+ return 0;
+}
+
+enum acpi_dev_status acpi_device_status(const struct udevice *dev)
+{
+ return ACPI_DSTATUS_ALL_ON;
+}
+
+/**
+ * largeres_write_len_f() - Write a placeholder word value
+ *
+ * Write a forward length for a large resource (2 bytes)
+ *
+ * @return pointer to the zero word (for fixing up later)
+ */
+static void *largeres_write_len_f(struct acpi_ctx *ctx)
+{
+ u8 *p = acpigen_get_current(ctx);
+
+ acpigen_emit_word(ctx, 0);
+
+ return p;
+}
+
+/**
+ * largeres_fill_from_len() - Fill in a length value
+ *
+ * This calculated the number of bytes since the provided @start and writes it
+ * to @ptr, which was previous returned by largeres_write_len_f().
+ *
+ * @ptr: Word to update
+ * @start: Start address to count from to calculated the length
+ */
+static void largeres_fill_from_len(struct acpi_ctx *ctx, char *ptr, u8 *start)
+{
+ u16 len = acpigen_get_current(ctx) - start;
+
+ ptr[0] = len & 0xff;
+ ptr[1] = (len >> 8) & 0xff;
+}
+
+/**
+ * largeres_fill_len() - Fill in a length value, excluding the length itself
+ *
+ * Fill in the length field with the value calculated from after the 16bit
+ * field to acpigen current. This is useful since the length value does not
+ * include the length field itself.
+ *
+ * This calls acpi_device_largeres_fill_len() passing @ptr + 2 as @start
+ *
+ * @ptr: Word to update.
+ */
+static void largeres_fill_len(struct acpi_ctx *ctx, void *ptr)
+{
+ largeres_fill_from_len(ctx, ptr, ptr + sizeof(u16));
+}
+
+/* ACPI 6.3 section 6.4.3.6: Extended Interrupt Descriptor */
+static int acpi_device_write_interrupt(struct acpi_ctx *ctx,
+ const struct acpi_irq *irq)
+{
+ void *desc_length;
+ u8 flags;
+
+ if (!irq->pin)
+ return -ENOENT;
+
+ /* This is supported by GpioInt() but not Interrupt() */
+ if (irq->polarity == ACPI_IRQ_ACTIVE_BOTH)
+ return -EINVAL;
+
+ /* Byte 0: Descriptor Type */
+ acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_INTERRUPT);
+
+ /* Byte 1-2: Length (filled in later) */
+ desc_length = largeres_write_len_f(ctx);
+
+ /*
+ * Byte 3: Flags
+ * [7:5]: Reserved
+ * [4]: Wake (0=NO_WAKE 1=WAKE)
+ * [3]: Sharing (0=EXCLUSIVE 1=SHARED)
+ * [2]: Polarity (0=HIGH 1=LOW)
+ * [1]: Mode (0=LEVEL 1=EDGE)
+ * [0]: Resource (0=PRODUCER 1=CONSUMER)
+ */
+ flags = BIT(0); /* ResourceConsumer */
+ if (irq->mode == ACPI_IRQ_EDGE_TRIGGERED)
+ flags |= BIT(1);
+ if (irq->polarity == ACPI_IRQ_ACTIVE_LOW)
+ flags |= BIT(2);
+ if (irq->shared == ACPI_IRQ_SHARED)
+ flags |= BIT(3);
+ if (irq->wake == ACPI_IRQ_WAKE)
+ flags |= BIT(4);
+ acpigen_emit_byte(ctx, flags);
+
+ /* Byte 4: Interrupt Table Entry Count */
+ acpigen_emit_byte(ctx, 1);
+
+ /* Byte 5-8: Interrupt Number */
+ acpigen_emit_dword(ctx, irq->pin);
+
+ /* Fill in Descriptor Length (account for len word) */
+ largeres_fill_len(ctx, desc_length);
+
+ return 0;
+}
+
+int acpi_device_write_interrupt_irq(struct acpi_ctx *ctx,
+ const struct irq *req_irq)
+{
+ struct acpi_irq irq;
+ int ret;
+
+ ret = irq_get_acpi(req_irq, &irq);
+ if (ret)
+ return log_msg_ret("get", ret);
+ ret = acpi_device_write_interrupt(ctx, &irq);
+ if (ret)
+ return log_msg_ret("write", ret);
+
+ return irq.pin;
+}
+
+/* ACPI 6.3 section 6.4.3.8.1 - GPIO Interrupt or I/O */
+int acpi_device_write_gpio(struct acpi_ctx *ctx, const struct acpi_gpio *gpio)
+{
+ void *start, *desc_length;
+ void *pin_table_offset, *vendor_data_offset, *resource_offset;
+ u16 flags = 0;
+ int pin;
+
+ if (gpio->type > ACPI_GPIO_TYPE_IO)
+ return -EINVAL;
+
+ start = acpigen_get_current(ctx);
+
+ /* Byte 0: Descriptor Type */
+ acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_GPIO);
+
+ /* Byte 1-2: Length (fill in later) */
+ desc_length = largeres_write_len_f(ctx);
+
+ /* Byte 3: Revision ID */
+ acpigen_emit_byte(ctx, ACPI_GPIO_REVISION_ID);
+
+ /* Byte 4: GpioIo or GpioInt */
+ acpigen_emit_byte(ctx, gpio->type);
+
+ /*
+ * Byte 5-6: General Flags
+ * [15:1]: 0 => Reserved
+ * [0]: 1 => ResourceConsumer
+ */
+ acpigen_emit_word(ctx, 1 << 0);
+
+ switch (gpio->type) {
+ case ACPI_GPIO_TYPE_INTERRUPT:
+ /*
+ * Byte 7-8: GPIO Interrupt Flags
+ * [15:5]: 0 => Reserved
+ * [4]: Wake (0=NO_WAKE 1=WAKE)
+ * [3]: Sharing (0=EXCLUSIVE 1=SHARED)
+ * [2:1]: Polarity (0=HIGH 1=LOW 2=BOTH)
+ * [0]: Mode (0=LEVEL 1=EDGE)
+ */
+ if (gpio->irq.mode == ACPI_IRQ_EDGE_TRIGGERED)
+ flags |= 1 << 0;
+ if (gpio->irq.shared == ACPI_IRQ_SHARED)
+ flags |= 1 << 3;
+ if (gpio->irq.wake == ACPI_IRQ_WAKE)
+ flags |= 1 << 4;
+
+ switch (gpio->irq.polarity) {
+ case ACPI_IRQ_ACTIVE_HIGH:
+ flags |= 0 << 1;
+ break;
+ case ACPI_IRQ_ACTIVE_LOW:
+ flags |= 1 << 1;
+ break;
+ case ACPI_IRQ_ACTIVE_BOTH:
+ flags |= 2 << 1;
+ break;
+ }
+ break;
+
+ case ACPI_GPIO_TYPE_IO:
+ /*
+ * Byte 7-8: GPIO IO Flags
+ * [15:4]: 0 => Reserved
+ * [3]: Sharing (0=EXCLUSIVE 1=SHARED)
+ * [2]: 0 => Reserved
+ * [1:0]: IO Restriction
+ * 0 => IoRestrictionNone
+ * 1 => IoRestrictionInputOnly
+ * 2 => IoRestrictionOutputOnly
+ * 3 => IoRestrictionNoneAndPreserve
+ */
+ flags |= gpio->io_restrict & 3;
+ if (gpio->io_shared)
+ flags |= 1 << 3;
+ break;
+ }
+ acpigen_emit_word(ctx, flags);
+
+ /*
+ * Byte 9: Pin Configuration
+ * 0x01 => Default (no configuration applied)
+ * 0x02 => Pull-up
+ * 0x03 => Pull-down
+ * 0x04-0x7F => Reserved
+ * 0x80-0xff => Vendor defined
+ */
+ acpigen_emit_byte(ctx, gpio->pull);
+
+ /* Byte 10-11: Output Drive Strength in 1/100 mA */
+ acpigen_emit_word(ctx, gpio->output_drive_strength);
+
+ /* Byte 12-13: Debounce Timeout in 1/100 ms */
+ acpigen_emit_word(ctx, gpio->interrupt_debounce_timeout);
+
+ /* Byte 14-15: Pin Table Offset, relative to start */
+ pin_table_offset = largeres_write_len_f(ctx);
+
+ /* Byte 16: Reserved */
+ acpigen_emit_byte(ctx, 0);
+
+ /* Byte 17-18: Resource Source Name Offset, relative to start */
+ resource_offset = largeres_write_len_f(ctx);
+
+ /* Byte 19-20: Vendor Data Offset, relative to start */
+ vendor_data_offset = largeres_write_len_f(ctx);
+
+ /* Byte 21-22: Vendor Data Length */
+ acpigen_emit_word(ctx, 0);
+
+ /* Fill in Pin Table Offset */
+ largeres_fill_from_len(ctx, pin_table_offset, start);
+
+ /* Pin Table, one word for each pin */
+ for (pin = 0; pin < gpio->pin_count; pin++)
+ acpigen_emit_word(ctx, gpio->pins[pin]);
+
+ /* Fill in Resource Source Name Offset */
+ largeres_fill_from_len(ctx, resource_offset, start);
+
+ /* Resource Source Name String */
+ acpigen_emit_string(ctx, gpio->resource);
+
+ /* Fill in Vendor Data Offset */
+ largeres_fill_from_len(ctx, vendor_data_offset, start);
+
+ /* Fill in GPIO Descriptor Length (account for len word) */
+ largeres_fill_len(ctx, desc_length);
+
+ return gpio->pins[0];
+}
+
+int acpi_device_write_gpio_desc(struct acpi_ctx *ctx,
+ const struct gpio_desc *desc)
+{
+ struct acpi_gpio gpio;
+ int ret;
+
+ ret = gpio_get_acpi(desc, &gpio);
+ if (ret)
+ return log_msg_ret("desc", ret);
+ ret = acpi_device_write_gpio(ctx, &gpio);
+ if (ret < 0)
+ return log_msg_ret("gpio", ret);
+
+ return ret;
+}
+
+int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx,
+ struct udevice *dev, const char *prop)
+{
+ struct irq req_irq;
+ int pin;
+ int ret;
+
+ ret = irq_get_by_index(dev, 0, &req_irq);
+ if (!ret) {
+ ret = acpi_device_write_interrupt_irq(ctx, &req_irq);
+ if (ret < 0)
+ return log_msg_ret("irq", ret);
+ pin = ret;
+ } else {
+ struct gpio_desc req_gpio;
+
+ ret = gpio_request_by_name(dev, prop, 0, &req_gpio,
+ GPIOD_IS_IN);
+ if (ret)
+ return log_msg_ret("no gpio", ret);
+ ret = acpi_device_write_gpio_desc(ctx, &req_gpio);
+ if (ret < 0)
+ return log_msg_ret("gpio", ret);
+ pin = ret;
+ }
+
+ 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)
+{
+ void *desc_length, *type_length;
+
+ /* Byte 0: Descriptor Type */
+ acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_SERIAL_BUS);
+
+ /* Byte 1+2: Length (filled in later) */
+ desc_length = largeres_write_len_f(ctx);
+
+ /* Byte 3: Revision ID */
+ acpigen_emit_byte(ctx, ACPI_I2C_SERIAL_BUS_REVISION_ID);
+
+ /* Byte 4: Resource Source Index is Reserved */
+ acpigen_emit_byte(ctx, 0);
+
+ /* Byte 5: Serial Bus Type is I2C */
+ acpigen_emit_byte(ctx, ACPI_SERIAL_BUS_TYPE_I2C);
+
+ /*
+ * Byte 6: Flags
+ * [7:2]: 0 => Reserved
+ * [1]: 1 => ResourceConsumer
+ * [0]: 0 => ControllerInitiated
+ */
+ acpigen_emit_byte(ctx, 1 << 1);
+
+ /*
+ * Byte 7-8: Type Specific Flags
+ * [15:1]: 0 => Reserved
+ * [0]: 0 => 7bit, 1 => 10bit
+ */
+ acpigen_emit_word(ctx, i2c->mode_10bit);
+
+ /* Byte 9: Type Specific Revision ID */
+ acpigen_emit_byte(ctx, ACPI_I2C_TYPE_SPECIFIC_REVISION_ID);
+
+ /* Byte 10-11: I2C Type Data Length */
+ type_length = largeres_write_len_f(ctx);
+
+ /* Byte 12-15: I2C Bus Speed */
+ acpigen_emit_dword(ctx, i2c->speed);
+
+ /* Byte 16-17: I2C Slave Address */
+ acpigen_emit_word(ctx, i2c->address);
+
+ /* Fill in Type Data Length */
+ largeres_fill_len(ctx, type_length);
+
+ /* Byte 18+: ResourceSource */
+ acpigen_emit_string(ctx, i2c->resource);
+
+ /* Fill in I2C Descriptor Length */
+ largeres_fill_len(ctx, desc_length);
+}
+
+/**
+ * acpi_device_set_i2c() - Set up an ACPI I2C struct from a device
+ *
+ * The value of @scope is not copied, but only referenced. This implies the
+ * caller has to ensure it stays valid for the lifetime of @i2c.
+ *
+ * @dev: I2C device to convert
+ * @i2c: Place to put the new structure
+ * @scope: Scope of the I2C device (this is the controller path)
+ * @return chip address of device
+ */
+static int acpi_device_set_i2c(const struct udevice *dev, struct acpi_i2c *i2c,
+ const char *scope)
+{
+ struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
+ struct udevice *bus = dev_get_parent(dev);
+
+ memset(i2c, '\0', sizeof(*i2c));
+ i2c->address = chip->chip_addr;
+ i2c->mode_10bit = 0;
+
+ /*
+ * i2c_bus->speed_hz is set if this device is probed, but if not we
+ * must use the device tree
+ */
+ i2c->speed = dev_read_u32_default(bus, "clock-frequency",
+ I2C_SPEED_STANDARD_RATE);
+ i2c->resource = scope;
+
+ return i2c->address;
+}
+
+int acpi_device_write_i2c_dev(struct acpi_ctx *ctx, const struct udevice *dev)
+{
+ char scope[ACPI_PATH_MAX];
+ struct acpi_i2c i2c;
+ int ret;
+
+ ret = acpi_device_scope(dev, scope, sizeof(scope));
+ if (ret)
+ return log_msg_ret("scope", ret);
+ ret = acpi_device_set_i2c(dev, &i2c, scope);
+ if (ret < 0)
+ return log_msg_ret("set", ret);
+ acpi_device_write_i2c(ctx, &i2c);
+
+ return ret;
+}
+
+#ifdef CONFIG_SPI
+/* ACPI 6.1 section 6.4.3.8.2.2 - SpiSerialBus() */
+static void acpi_device_write_spi(struct acpi_ctx *ctx, const struct acpi_spi *spi)
+{
+ void *desc_length, *type_length;
+ u16 flags = 0;
+
+ /* Byte 0: Descriptor Type */
+ acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_SERIAL_BUS);
+
+ /* Byte 1+2: Length (filled in later) */
+ desc_length = largeres_write_len_f(ctx);
+
+ /* Byte 3: Revision ID */
+ acpigen_emit_byte(ctx, ACPI_SPI_SERIAL_BUS_REVISION_ID);
+
+ /* Byte 4: Resource Source Index is Reserved */
+ acpigen_emit_byte(ctx, 0);
+
+ /* Byte 5: Serial Bus Type is SPI */
+ acpigen_emit_byte(ctx, ACPI_SERIAL_BUS_TYPE_SPI);
+
+ /*
+ * Byte 6: Flags
+ * [7:2]: 0 => Reserved
+ * [1]: 1 => ResourceConsumer
+ * [0]: 0 => ControllerInitiated
+ */
+ acpigen_emit_byte(ctx, BIT(1));
+
+ /*
+ * Byte 7-8: Type Specific Flags
+ * [15:2]: 0 => Reserveda
+ * [1]: 0 => ActiveLow, 1 => ActiveHigh
+ * [0]: 0 => FourWire, 1 => ThreeWire
+ */
+ if (spi->wire_mode == SPI_3_WIRE_MODE)
+ flags |= BIT(0);
+ if (spi->device_select_polarity == SPI_POLARITY_HIGH)
+ flags |= BIT(1);
+ acpigen_emit_word(ctx, flags);
+
+ /* Byte 9: Type Specific Revision ID */
+ acpigen_emit_byte(ctx, ACPI_SPI_TYPE_SPECIFIC_REVISION_ID);
+
+ /* Byte 10-11: SPI Type Data Length */
+ type_length = largeres_write_len_f(ctx);
+
+ /* Byte 12-15: Connection Speed */
+ acpigen_emit_dword(ctx, spi->speed);
+
+ /* Byte 16: Data Bit Length */
+ acpigen_emit_byte(ctx, spi->data_bit_length);
+
+ /* Byte 17: Clock Phase */
+ acpigen_emit_byte(ctx, spi->clock_phase);
+
+ /* Byte 18: Clock Polarity */
+ acpigen_emit_byte(ctx, spi->clock_polarity);
+
+ /* Byte 19-20: Device Selection */
+ acpigen_emit_word(ctx, spi->device_select);
+
+ /* Fill in Type Data Length */
+ largeres_fill_len(ctx, type_length);
+
+ /* Byte 21+: ResourceSource String */
+ acpigen_emit_string(ctx, spi->resource);
+
+ /* Fill in SPI Descriptor Length */
+ largeres_fill_len(ctx, desc_length);
+}
+
+/**
+ * acpi_device_set_spi() - Set up an ACPI SPI struct from a device
+ *
+ * The value of @scope is not copied, but only referenced. This implies the
+ * caller has to ensure it stays valid for the lifetime of @spi.
+ *
+ * @dev: SPI device to convert
+ * @spi: Place to put the new structure
+ * @scope: Scope of the SPI device (this is the controller path)
+ * @return 0 (always)
+ */
+static int acpi_device_set_spi(const struct udevice *dev, struct acpi_spi *spi,
+ const char *scope)
+{
+ struct dm_spi_slave_platdata *plat;
+ struct spi_slave *slave = dev_get_parent_priv(dev);
+
+ plat = dev_get_parent_platdata(slave->dev);
+ memset(spi, '\0', sizeof(*spi));
+ spi->device_select = plat->cs;
+ spi->device_select_polarity = SPI_POLARITY_LOW;
+ spi->wire_mode = SPI_4_WIRE_MODE;
+ spi->speed = plat->max_hz;
+ spi->data_bit_length = slave->wordlen;
+ spi->clock_phase = plat->mode & SPI_CPHA ?
+ SPI_CLOCK_PHASE_SECOND : SPI_CLOCK_PHASE_FIRST;
+ spi->clock_polarity = plat->mode & SPI_CPOL ?
+ SPI_POLARITY_HIGH : SPI_POLARITY_LOW;
+ spi->resource = scope;
+
+ return 0;
+}
+
+int acpi_device_write_spi_dev(struct acpi_ctx *ctx, const struct udevice *dev)
+{
+ char scope[ACPI_PATH_MAX];
+ struct acpi_spi spi;
+ int ret;
+
+ ret = acpi_device_scope(dev, scope, sizeof(scope));
+ if (ret)
+ return log_msg_ret("scope", ret);
+ ret = acpi_device_set_spi(dev, &spi, scope);
+ if (ret)
+ return log_msg_ret("set", ret);
+ acpi_device_write_spi(ctx, &spi);
+
+ return 0;
+}
+#endif /* CONFIG_SPI */
+
+static const char *acpi_name_from_id(enum uclass_id id)
+{
+ switch (id) {
+ case UCLASS_USB_HUB:
+ /* Root Hub */
+ return "RHUB";
+ /* DSDT: acpi/northbridge.asl */
+ case UCLASS_NORTHBRIDGE:
+ return "MCHC";
+ /* DSDT: acpi/lpc.asl */
+ case UCLASS_LPC:
+ return "LPCB";
+ /* DSDT: acpi/xhci.asl */
+ case UCLASS_USB:
+ /* This only supports USB3.0 controllers at present */
+ return "XHCI";
+ case UCLASS_PWM:
+ return "PWM";
+ default:
+ return NULL;
+ }
+}
+
+static int acpi_check_seq(const struct udevice *dev)
+{
+ if (dev->req_seq == -1) {
+ log_warning("Device '%s' has no seq\n", dev->name);
+ return log_msg_ret("no seq", -ENXIO);
+ }
+
+ return dev->req_seq;
+}
+
+/* If you change this function, add test cases to dm_test_acpi_get_name() */
+int acpi_device_infer_name(const struct udevice *dev, char *out_name)
+{
+ enum uclass_id parent_id = UCLASS_INVALID;
+ enum uclass_id id;
+ const char *name = NULL;
+
+ id = device_get_uclass_id(dev);
+ if (dev_get_parent(dev))
+ parent_id = device_get_uclass_id(dev_get_parent(dev));
+
+ if (id == UCLASS_SOUND)
+ name = "HDAS";
+ else if (id == UCLASS_PCI)
+ name = "PCI0";
+ else if (device_is_on_pci_bus(dev))
+ name = acpi_name_from_id(id);
+ if (!name) {
+ switch (parent_id) {
+ case UCLASS_USB: {
+ struct usb_device *udev = dev_get_parent_priv(dev);
+
+ sprintf(out_name, udev->speed >= USB_SPEED_SUPER ?
+ "HS%02d" : "FS%02d", udev->portnr);
+ name = out_name;
+ break;
+ }
+ default:
+ break;
+ }
+ }
+ if (!name) {
+ int num;
+
+ switch (id) {
+ /* DSDT: acpi/lpss.asl */
+ case UCLASS_SERIAL:
+ num = acpi_check_seq(dev);
+ if (num < 0)
+ return num;
+ sprintf(out_name, "URT%d", num);
+ name = out_name;
+ break;
+ case UCLASS_I2C:
+ num = acpi_check_seq(dev);
+ if (num < 0)
+ return num;
+ sprintf(out_name, "I2C%d", num);
+ name = out_name;
+ break;
+ case UCLASS_SPI:
+ num = acpi_check_seq(dev);
+ if (num < 0)
+ return num;
+ sprintf(out_name, "SPI%d", num);
+ name = out_name;
+ break;
+ default:
+ break;
+ }
+ }
+ if (!name) {
+ log_warning("No name for device '%s'\n", dev->name);
+ return -ENOENT;
+ }
+ if (name != out_name)
+ acpi_copy_name(out_name, name);
+
+ return 0;
+}
generated by cgit (git 2.34.1) at 2025-01-08 10:03:22 +0000