google/fizz: Set BJ max current and voltage

This patch makes coreboot set the max current and voltage for barrel jack
adapters.

BUG=b:64442692
BRANCH=none
TEST=Boot Fizz. Use chgsup console command to verify the max current and
voltage are set as expected.

Change-Id: Ifebee09096e0935cc7d3e53920a251b0496d3c55
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://review.coreboot.org/22623
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/fizz/mainboard.c

@@ -37,9 +37,64 @@
  */
 #define GET_TYPEC_PL2(w)   (9 * (w) / 10)
 
+#define OEM_ID_COUNT	3
+#define SKU_ID_COUNT	7
+
+/* List of BJ adapters shipped with Fizz or its variants */
+enum bj_adapter {
+	BJ_UNKNOWN,
+	BJ_65W_19V,
+	BJ_90W_19V,
+	BJ_65W_19P5V,
+	BJ_90W_19P5V,
+	BJ_COUNT,
+};
+
+/* BJ adapter specs */
+static const struct {
+	uint16_t current_lim; /* in mA */
+	uint16_t voltage_lim; /* in mV */
+} bj_adapters[] = {
+	[BJ_65W_19V] = { .current_lim = 3420, .voltage_lim = 19000 },
+	[BJ_90W_19V] = { .current_lim = 4740, .voltage_lim = 19000 },
+	[BJ_65W_19P5V] = { .current_lim = 3330, .voltage_lim = 19500 },
+	[BJ_90W_19P5V] = { .current_lim = 4620, .voltage_lim = 19500 },
+};
+
+/*
+ * The table showing which device is shipped with which BJ adapter.
+ *
+ *        | SKU0     SKU1     ...
+ *   OEM0 | AdapterX AdapterZ ...
+ *   OEM1 | AdapterY ...
+ *   ...  |
+ */
+static const enum bj_adapter bj_adapter_table[OEM_ID_COUNT][SKU_ID_COUNT] = {
+	{ BJ_65W_19P5V, BJ_65W_19P5V, BJ_90W_19P5V, BJ_90W_19P5V,
+			BJ_90W_19P5V, BJ_90W_19P5V, BJ_65W_19P5V },
+	{ BJ_65W_19V, BJ_65W_19V, BJ_UNKNOWN, BJ_UNKNOWN,
+			BJ_90W_19V, BJ_90W_19V, BJ_UNKNOWN },
+	{ BJ_65W_19V, BJ_65W_19V, BJ_90W_19V, BJ_90W_19V,
+			BJ_90W_19V, BJ_90W_19V, BJ_65W_19V },
+};
+
 static const char *oem_id = "GOOGLE";
 static const char *oem_table_id = "FIZZ";
 
+static uint8_t board_sku_id(void)
+{
+	static int id = -1;
+	const gpio_t sku_id_gpios[] = {
+		GPIO_SKU_ID0,
+		GPIO_SKU_ID1,
+		GPIO_SKU_ID2,
+		GPIO_SKU_ID3,
+	};
+	if (id < 0)
+		id = gpio_base2_value(sku_id_gpios, ARRAY_SIZE(sku_id_gpios));
+	return id;
+}
+
 /*
  * mainboard_get_pl2
  *
@@ -50,25 +105,16 @@ static const char *oem_table_id = "FIZZ";
  */
 static u32 mainboard_get_pl2(void)
 {
-	const gpio_t sku_id_gpios[] = {
-		GPIO_SKU_ID0,
-		GPIO_SKU_ID1,
-		GPIO_SKU_ID2,
-		GPIO_SKU_ID3,
-	};
 	enum usb_chg_type type;
 	u32 watts;
 
 	int rv = google_chromeec_get_usb_pd_power_info(&type, &watts);
-	int sku_id;
 
 	/* If we can't get charger info or not PD charger, assume barrel jack */
 	if (rv != 0 || type != USB_CHG_TYPE_PD) {
 		/* using the barrel jack, get PL2 based on sku id */
 		watts = FIZZ_PL2_OTHERS;
-		sku_id = gpio_base2_value(sku_id_gpios,
+		if (board_sku_id() == FIZZ_SKU_ID_I7_U42)
-					  ARRAY_SIZE(sku_id_gpios));
-		if (sku_id == FIZZ_SKU_ID_I7_U42)
 			watts = FIZZ_PL2_I7_U42;
 	} else
 		watts = GET_TYPEC_PL2(watts);
@@ -78,16 +124,15 @@ static u32 mainboard_get_pl2(void)
 
 static uint8_t board_oem_id(void)
 {
-	static int board_oem_id = -1;
+	static int id = -1;
 	const gpio_t oem_id_gpios[] = {
 		GPIO_OEM_ID1,
 		GPIO_OEM_ID2,
 		GPIO_OEM_ID3,
 	};
-	if (board_oem_id < 0)
+	if (id < 0)
-		board_oem_id = gpio_base2_value(oem_id_gpios,
+		id = gpio_base2_value(oem_id_gpios, ARRAY_SIZE(oem_id_gpios));
-						ARRAY_SIZE(oem_id_gpios));
+	return id;
-	return board_oem_id;
 }
 
 const char *smbios_mainboard_sku(void)
@@ -130,6 +175,36 @@ static unsigned long mainboard_write_acpi_tables(
 	return end_addr;
 }
 
+/*
+ * Set max current and voltage for a barrel jack adapter based on {OEM, SKU}.
+ * If this fails, the limit will remain unchanged = default values, which make
+ * the system run under safe but under-rated power.
+ * If a BJ adapter isn't plugged, this is a no-op.
+ */
+static void set_bj_adapter_limit(void)
+{
+	uint8_t oem = board_oem_id();
+	uint8_t sku = board_sku_id();
+	enum bj_adapter bj;
+
+	if (oem >= OEM_ID_COUNT || sku >= SKU_ID_COUNT) {
+		printk(BIOS_ERR, "Unrecognized OEM or SKU: %d/%d\n", oem, sku);
+		return;
+	}
+
+	bj = bj_adapter_table[oem][sku];
+	if (bj <= BJ_UNKNOWN || BJ_COUNT <= bj) {
+		printk(BIOS_ERR, "Invalid BJ adapter ID: %d\n", bj);
+		return;
+	}
+	printk(BIOS_INFO, "Setting BJ limit: %dmA/%dmV\n",
+	       bj_adapters[bj].current_lim, bj_adapters[bj].voltage_lim);
+	if (google_chromeec_override_dedicated_charger_limit(
+			bj_adapters[bj].current_lim,
+			bj_adapters[bj].voltage_lim))
+		printk(BIOS_ERR, "Failed to set BJ limit\n");
+}
+
 static void mainboard_enable(device_t dev)
 {
 	device_t root = SA_DEV_ROOT;
@@ -137,6 +212,8 @@ static void mainboard_enable(device_t dev)
 
 	conf->tdp_pl2_override = mainboard_get_pl2();
 
+	set_bj_adapter_limit();
+
 	dev->ops->init = mainboard_init;
 	dev->ops->acpi_inject_dsdt_generator = chromeos_dsdt_generator;
 	dev->ops->write_acpi_tables = mainboard_write_acpi_tables;