3 files changed, 272 insertions, 0 deletions
diff --git a/drivers/allwinner/axp/axp803.c b/drivers/allwinner/axp/axp803.c
new file mode 100644
index 0000000..19a9549
--- /dev/null
+++ b/drivers/allwinner/axp/axp803.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <drivers/allwinner/axp.h>
+
+const uint8_t axp_chip_id = AXP803_CHIP_ID;
+const char *const axp_compatible = "x-powers,axp803";
+
+#if SUNXI_SETUP_REGULATORS == 1
+const struct axp_regulator axp_regulators[] = {
+	{"aldo1",  700, 3300, 100, NA, 0x28, 0x13, 5},
+	{"dcdc1", 1600, 3400, 100, NA, 0x20, 0x10, 0},
+	{"dcdc5",  800, 1840,  10, 32, 0x24, 0x10, 4},
+	{"dcdc6",  600, 1520,  10, 50, 0x25, 0x10, 5},
+	{"dldo1",  700, 3300, 100, NA, 0x15, 0x12, 3},
+	{"dldo2",  700, 4200, 100, 27, 0x16, 0x12, 4},
+	{"dldo3",  700, 3300, 100, NA, 0x17, 0x12, 5},
+	{"dldo4",  700, 3300, 100, NA, 0x18, 0x12, 6},
+	{"fldo1",  700, 1450,  50, NA, 0x1c, 0x13, 2},
+	{}
+};
+#endif
diff --git a/drivers/allwinner/axp/axp805.c b/drivers/allwinner/axp/axp805.c
new file mode 100644
index 0000000..3a03fec
--- /dev/null
+++ b/drivers/allwinner/axp/axp805.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <drivers/allwinner/axp.h>
+
+const uint8_t axp_chip_id = AXP805_CHIP_ID;
+const char *const axp_compatible = "x-powers,axp805";
+
+#if SUNXI_SETUP_REGULATORS == 1
+/*
+ * The "dcdcd" split changes the step size by a factor of 5, not 2;
+ * disallow values above the split to maintain accuracy.
+ */
+const struct axp_regulator axp_regulators[] = {
+	{"dcdca",  600, 1520,  10, 50, 0x12, 0x10, 0},
+	{"dcdcb", 1000, 2550,  50, NA, 0x13, 0x10, 1},
+	{"dcdcc",  600, 1520,  10, 50, 0x14, 0x10, 2},
+	{"dcdcd",  600, 1500,  20, NA, 0x15, 0x10, 3},
+	{"dcdce", 1100, 3400, 100, NA, 0x16, 0x10, 4},
+	{"aldo1",  700, 3300, 100, NA, 0x17, 0x10, 5},
+	{"aldo2",  700, 3300, 100, NA, 0x18, 0x10, 6},
+	{"aldo3",  700, 3300, 100, NA, 0x19, 0x10, 7},
+	{"bldo1",  700, 1900, 100, NA, 0x20, 0x11, 0},
+	{"bldo2",  700, 1900, 100, NA, 0x21, 0x11, 1},
+	{"bldo3",  700, 1900, 100, NA, 0x22, 0x11, 2},
+	{"bldo4",  700, 1900, 100, NA, 0x23, 0x11, 3},
+	{"cldo1",  700, 3300, 100, NA, 0x24, 0x11, 4},
+	{"cldo2",  700, 4200, 100, 27, 0x25, 0x11, 5},
+	{"cldo3",  700, 3300, 100, NA, 0x26, 0x11, 6},
+	{}
+};
+#endif
diff --git a/drivers/allwinner/axp/common.c b/drivers/allwinner/axp/common.c
new file mode 100644
index 0000000..f1250b0
--- /dev/null
+++ b/drivers/allwinner/axp/common.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+
+#include <libfdt.h>
+
+#include <common/debug.h>
+#include <drivers/allwinner/axp.h>
+
+int axp_check_id(void)
+{
+	int ret;
+
+	ret = axp_read(0x03);
+	if (ret < 0)
+		return ret;
+
+	ret &= 0xcf;
+	if (ret != axp_chip_id) {
+		ERROR("PMIC: Found unknown PMIC %02x\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+int axp_clrsetbits(uint8_t reg, uint8_t clr_mask, uint8_t set_mask)
+{
+	uint8_t val;
+	int ret;
+
+	ret = axp_read(reg);
+	if (ret < 0)
+		return ret;
+
+	val = (ret & ~clr_mask) | set_mask;
+
+	return axp_write(reg, val);
+}
+
+void axp_power_off(void)
+{
+	/* Set "power disable control" bit */
+	axp_setbits(0x32, BIT(7));
+}
+
+#if SUNXI_SETUP_REGULATORS == 1
+/*
+ * Retrieve the voltage from a given regulator DTB node.
+ * Both the regulator-{min,max}-microvolt properties must be present and
+ * have the same value. Return that value in millivolts.
+ */
+static int fdt_get_regulator_millivolt(const void *fdt, int node)
+{
+	const fdt32_t *prop;
+	uint32_t min_volt;
+
+	prop = fdt_getprop(fdt, node, "regulator-min-microvolt", NULL);
+	if (prop == NULL)
+		return -EINVAL;
+	min_volt = fdt32_to_cpu(*prop);
+
+	prop = fdt_getprop(fdt, node, "regulator-max-microvolt", NULL);
+	if (prop == NULL)
+		return -EINVAL;
+
+	if (fdt32_to_cpu(*prop) != min_volt)
+		return -EINVAL;
+
+	return min_volt / 1000;
+}
+
+static int setup_regulator(const void *fdt, int node,
+			   const struct axp_regulator *reg)
+{
+	uint8_t val;
+	int mvolt;
+
+	mvolt = fdt_get_regulator_millivolt(fdt, node);
+	if (mvolt < reg->min_volt || mvolt > reg->max_volt)
+		return -EINVAL;
+
+	val = (mvolt / reg->step) - (reg->min_volt / reg->step);
+	if (val > reg->split)
+		val = ((val - reg->split) / 2) + reg->split;
+
+	axp_write(reg->volt_reg, val);
+	axp_setbits(reg->switch_reg, BIT(reg->switch_bit));
+
+	INFO("PMIC: %s voltage: %d.%03dV\n", reg->dt_name,
+	     mvolt / 1000, mvolt % 1000);
+
+	return 0;
+}
+
+static bool is_node_disabled(const void *fdt, int node)
+{
+	const char *cell;
+	cell = fdt_getprop(fdt, node, "status", NULL);
+	if (cell == NULL) {
+		return false;
+	}
+	return strcmp(cell, "okay") != 0;
+}
+
+static bool should_enable_regulator(const void *fdt, int node)
+{
+	if (is_node_disabled(fdt, node)) {
+		return false;
+	}
+	if (fdt_getprop(fdt, node, "phandle", NULL) != NULL) {
+		return true;
+	}
+	if (fdt_getprop(fdt, node, "regulator-always-on", NULL) != NULL) {
+		return true;
+	}
+	return false;
+}
+
+static bool board_uses_usb0_host_mode(const void *fdt)
+{
+	int node, length;
+	const char *prop;
+
+	node = fdt_node_offset_by_compatible(fdt, -1,
+					     "allwinner,sun8i-a33-musb");
+	if (node < 0) {
+		return false;
+	}
+
+	prop = fdt_getprop(fdt, node, "dr_mode", &length);
+	if (!prop) {
+		return false;
+	}
+
+	return !strncmp(prop, "host", length);
+}
+
+void axp_setup_regulators(const void *fdt)
+{
+	int node;
+	bool sw = false;
+
+	if (fdt == NULL)
+		return;
+
+	/* locate the PMIC DT node, bail out if not found */
+	node = fdt_node_offset_by_compatible(fdt, -1, axp_compatible);
+	if (node < 0) {
+		WARN("PMIC: No PMIC DT node, skipping setup\n");
+		return;
+	}
+
+	/* This applies to AXP803 only. */
+	if (fdt_getprop(fdt, node, "x-powers,drive-vbus-en", NULL) &&
+	    board_uses_usb0_host_mode(fdt)) {
+		axp_clrbits(0x8f, BIT(4));
+		axp_setbits(0x30, BIT(2));
+		INFO("PMIC: Enabling DRIVEVBUS\n");
+	}
+
+	/* descend into the "regulators" subnode */
+	node = fdt_subnode_offset(fdt, node, "regulators");
+	if (node < 0) {
+		WARN("PMIC: No regulators DT node, skipping setup\n");
+		return;
+	}
+
+	/* iterate over all regulators to find used ones */
+	fdt_for_each_subnode(node, fdt, node) {
+		const struct axp_regulator *reg;
+		const char *name;
+		int length;
+
+		/* We only care if it's always on or referenced. */
+		if (!should_enable_regulator(fdt, node))
+			continue;
+
+		name = fdt_get_name(fdt, node, &length);
+
+		/* Enable the switch last to avoid overheating. */
+		if (!strncmp(name, "dc1sw", length) ||
+		    !strncmp(name, "sw", length)) {
+			sw = true;
+			continue;
+		}
+
+		for (reg = axp_regulators; reg->dt_name; reg++) {
+			if (!strncmp(name, reg->dt_name, length)) {
+				setup_regulator(fdt, node, reg);
+				break;
+			}
+		}
+	}
+
+	/*
+	 * On the AXP803, if DLDO2 is enabled after DC1SW, the PMIC overheats
+	 * and shuts down. So always enable DC1SW as the very last regulator.
+	 */
+	if (sw) {
+		INFO("PMIC: Enabling DC SW\n");
+		if (axp_chip_id == AXP803_CHIP_ID)
+			axp_setbits(0x12, BIT(7));
+		if (axp_chip_id == AXP805_CHIP_ID)
+			axp_setbits(0x11, BIT(7));
+	}
+}
+#endif	/* SUNXI_SETUP_REGULATORS */