drivers/intel/mipi_camera: Add camera power resource to SSDT

This change adds support function to parse entries in the devicetree to
generate PowerResource entries for the MIPI camera.

Change-Id: I31e198b50acf2c64035aff9cb054fbe3602dd83e
Signed-off-by: Sugnan Prabhu S <sugnan.prabhu.s@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41624
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 159 insertions, 0 deletions

diff --git a/src/drivers/intel/mipi_camera/camera.c b/src/drivers/intel/mipi_camera/camera.c
index 03e5ab65db..f32f744f8f 100644
--- a/src/drivers/intel/mipi_camera/camera.c
+++ b/src/drivers/intel/mipi_camera/camera.c
@@ -17,6 +17,7 @@
 #define DEFAULT_REMOTE_NAME	"\\_SB.PCI0.CIO2"
 #define CIO2_PCI_DEV		0x14
 #define CIO2_PCI_FN		0x3
+#define POWER_RESOURCE_NAME	"PRIC"
 
 /*
  * This implementation assumes there is only 1 endpoint at each end of every data port. It also
@@ -435,6 +436,58 @@ static void camera_fill_vcm(const struct device *dev)
 	acpi_dp_write(dsd);
 }
 
+static void fill_power_res_sequence(struct drivers_intel_mipi_camera_config *config,
+				    struct operation_seq *seq)
+{
+	unsigned int i;
+	uint8_t index;
+	uint8_t gpio_num;
+
+	for (i = 0; i < seq->ops_cnt; i++) {
+		switch (seq->ops[i].type) {
+		case IMGCLK:
+			index = seq->ops[i].index;
+			if (seq->ops[i].action == ENABLE) {
+				acpigen_emit_namestring("MCON");
+				acpigen_write_byte(config->clk_panel.clks[index].clknum);
+				acpigen_write_byte(config->clk_panel.clks[index].freq);
+			} else if (seq->ops[i].action == DISABLE) {
+				acpigen_emit_namestring("MCOF");
+				acpigen_write_byte(config->clk_panel.clks[index].clknum);
+			} else {
+				acpigen_write_debug_string("Unsupported clock action");
+				printk(BIOS_ERR, "Unsupported clock action: %x\n",
+				       seq->ops[i].action);
+				printk(BIOS_ERR, "OS camera driver will likely not work");
+			}
+
+			break;
+		case GPIO:
+			index = seq->ops[i].index;
+			gpio_num = config->gpio_panel.gpio[index].gpio_num;
+			if (seq->ops[i].action == ENABLE) {
+				acpigen_soc_set_tx_gpio(gpio_num);
+			} else if (seq->ops[i].action == DISABLE) {
+				acpigen_soc_clear_tx_gpio(gpio_num);
+			} else {
+				acpigen_write_debug_string("Unsupported GPIO action");
+				printk(BIOS_ERR, "Unsupported GPIO action: %x\n",
+				       seq->ops[i].action);
+				printk(BIOS_ERR, "OS camera driver will likely not work");
+			}
+
+			break;
+		default:
+			printk(BIOS_ERR, "Unsupported power operation: %x\n", seq->ops[i].type);
+			printk(BIOS_ERR, "OS camera driver will likely not work");
+			break;
+		}
+
+		if (seq->ops[i].delay_ms)
+			acpigen_write_sleep(seq->ops[i].delay_ms);
+	}
+}
+
 static void write_pci_camera_device(const struct device *dev)
 {
 	struct drivers_intel_mipi_camera_config *config = dev->chip_info;
@@ -467,6 +520,40 @@ static void write_i2c_camera_device(const struct device *dev, const char *scope)
 
 	acpigen_write_device(acpi_device_name(dev));
 
+	/* add power resource */
+	if (config->has_power_resource) {
+		acpigen_write_power_res(POWER_RESOURCE_NAME, 0, 0, NULL, 0);
+		acpigen_write_name_integer("STA", 0);
+		acpigen_write_STA_ext("STA");
+
+		acpigen_write_method_serialized("_ON", 0);
+		acpigen_write_if();
+		acpigen_emit_byte(LEQUAL_OP);
+		acpigen_emit_namestring("STA");
+		acpigen_write_integer(0);
+
+		fill_power_res_sequence(config, &config->on_seq);
+
+		acpigen_write_store_op_to_namestr(1, "STA");
+		acpigen_pop_len(); /* if */
+		acpigen_pop_len(); /* _ON */
+
+		/* _OFF operations */
+		acpigen_write_method_serialized("_OFF", 0);
+		acpigen_write_if();
+		acpigen_emit_byte(LEQUAL_OP);
+		acpigen_emit_namestring("STA");
+		acpigen_write_integer(1);
+
+		fill_power_res_sequence(config, &config->off_seq);
+
+		acpigen_write_store_op_to_namestr(0, "STA");
+		acpigen_pop_len(); /* if */
+		acpigen_pop_len(); /* _ON */
+
+		acpigen_pop_len(); /* Power Resource */
+	}
+
 	if (config->device_type == INTEL_ACPI_CAMERA_SENSOR)
 		acpigen_write_name_integer("_ADR", 0);
 
@@ -519,6 +606,17 @@ static void write_camera_device_common(const struct device *dev)
 		acpigen_write_name_integer("CAMD", config->device_type);
 	}
 
+	if (config->pr0 || config->has_power_resource) {
+		acpigen_write_name("_PR0");
+		acpigen_write_package(1);
+		if (config->pr0)
+			acpigen_emit_namestring(config->pr0); /* External power resource */
+		else
+			acpigen_emit_namestring(POWER_RESOURCE_NAME);
+
+		acpigen_pop_len(); /* _PR0 */
+	}
+
 	switch (config->device_type) {
 	case INTEL_ACPI_CAMERA_CIO2:
 		camera_fill_cio2(dev);
diff --git a/src/drivers/intel/mipi_camera/chip.h b/src/drivers/intel/mipi_camera/chip.h
index 92d3eac6cf..d133f7df86 100644
--- a/src/drivers/intel/mipi_camera/chip.h
+++ b/src/drivers/intel/mipi_camera/chip.h
@@ -10,6 +10,18 @@
 #define MAX_PWDB_ENTRIES	12
 #define MAX_PORT_ENTRIES	4
 #define MAX_LINK_FREQ_ENTRIES	4
+#define MAX_CLK_CONFIGS		2
+#define MAX_GPIO_CONFIGS	4
+#define MAX_PWR_OPS		5
+
+#define SEQ_OPS_CLK_ENABLE(ind, delay) \
+	{ .type = IMGCLK, .index = (ind), .action = ENABLE, .delay_ms = (delay) }
+#define SEQ_OPS_CLK_DISABLE(ind, delay) \
+	{ .type = IMGCLK, .index = (ind), .action = DISABLE, .delay_ms = (delay) }
+#define SEQ_OPS_GPIO_ENABLE(ind, delay) \
+	{ .type = GPIO, .index = (ind), .action = ENABLE, .delay_ms = (delay) }
+#define SEQ_OPS_GPIO_DISABLE(ind, delay) \
+	{ .type = GPIO, .index = (ind), .action = DISABLE, .delay_ms = (delay) }
 
 enum camera_device_type {
 	DEV_TYPE_SENSOR = 0,
@@ -57,6 +69,47 @@ enum intel_power_action_type {
 	INTEL_ACPI_CAMERA_GPIO,
 };
 
+enum ctrl_type {
+	IMGCLK = 1,
+	GPIO
+};
+
+enum action_type {
+	ENABLE = 1,
+	DISABLE
+};
+
+struct clk_config {
+	/* IMGCLKOUT_x being used for a port */
+	uint8_t clknum;
+	/* frequency setting: 0:24Mhz, 1:19.2 Mhz */
+	uint8_t freq;
+} __packed;
+
+struct gpio_config {
+	uint8_t gpio_num;
+} __packed;
+
+struct clock_ctrl_panel {
+	struct clk_config clks[MAX_CLK_CONFIGS];
+} __packed;
+
+struct gpio_ctrl_panel {
+	struct gpio_config gpio[MAX_GPIO_CONFIGS];
+} __packed;
+
+struct operation_type {
+	enum ctrl_type type;
+	uint8_t index;
+	enum action_type action;
+	uint32_t delay_ms;
+} __packed;
+
+struct operation_seq {
+	struct operation_type ops[MAX_PWR_OPS];
+	uint8_t ops_cnt;
+} __packed;
+
 struct intel_ssdb {
 	uint8_t version;			/* Current version */
 	uint8_t sensor_card_sku;		/* CRD Board type */
@@ -122,6 +175,11 @@ struct intel_pwdb {
 } __packed;
 
 struct drivers_intel_mipi_camera_config {
+	struct clock_ctrl_panel clk_panel;
+	struct gpio_ctrl_panel gpio_panel;
+	struct operation_seq on_seq;
+	struct operation_seq off_seq;
+
 	struct intel_ssdb ssdb;
 	struct intel_pwdb pwdb[MAX_PWDB_ENTRIES];
 	enum intel_camera_device_type device_type;
@@ -130,6 +188,7 @@ struct drivers_intel_mipi_camera_config {
 	const char *acpi_name;
 	const char *chip_name;
 	unsigned int acpi_uid;
+	const char *pr0;
 
 	/* Settings specific to CIO2 device */
 	uint32_t cio2_num_ports;
@@ -163,6 +222,8 @@ struct drivers_intel_mipi_camera_config {
 
 	/* Settings specific to vcm */
 	const char *vcm_compat;
+	/* Does the device have a power resource entries */
+	bool has_power_resource;
 };
 
 #endif