pmic: pmic_mc34vr500: Add APIs to set/get SWx volt

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: York Sun <york.sun@nxp.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/board/freescale/common/mc34vr500.c b/board/freescale/common/mc34vr500.c
new file mode 100644
index 0000000000..9c57569366
--- /dev/null
+++ b/board/freescale/common/mc34vr500.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/mc34vr500_pmic.h>
+
+static uint8_t swxvolt_addr[4] = { MC34VR500_SW1VOLT,
+				   MC34VR500_SW2VOLT,
+				   MC34VR500_SW3VOLT,
+				   MC34VR500_SW4VOLT };
+
+static uint8_t swx_set_point_base[4] = { 13, 9, 9, 9 };
+
+int mc34vr500_get_sw_volt(uint8_t sw)
+{
+	struct pmic *p;
+	u32 swxvolt;
+	uint8_t spb;
+	int sw_volt;
+	int ret;
+
+	debug("%s: Get SW%u volt from swxvolt_addr = 0x%x\n",
+	      __func__, sw + 1, swxvolt_addr[sw]);
+	if (sw > SW4) {
+		printf("%s: Unsupported SW(sw%d)\n", __func__, sw + 1);
+		return -EINVAL;
+	}
+
+	p = pmic_get("MC34VR500");
+	if (!p) {
+		printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
+		return -ENODEV;
+	}
+
+	ret = pmic_probe(p);
+	if (ret)
+		return ret;
+
+	ret = pmic_reg_read(p, swxvolt_addr[sw], &swxvolt);
+	if (ret) {
+		printf("%s: Failed to get SW%u volt\n", __func__, sw + 1);
+		return ret;
+	}
+
+	debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
+	spb = swx_set_point_base[sw];
+	/* The base of SW volt is 625mV and increase by step 25mV */
+	sw_volt = 625 + (swxvolt - spb) * 25;
+
+	debug("%s: SW%u volt = %dmV\n", __func__, sw + 1, sw_volt);
+	return sw_volt;
+}
+
+int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt)
+{
+	struct pmic *p;
+	u32 swxvolt;
+	uint8_t spb;
+	int ret;
+
+	debug("%s: Set SW%u volt to %dmV\n", __func__, sw + 1, sw_volt);
+	/* The least SW volt is 625mV, and only 4 SW outputs */
+	if (sw > SW4 || sw_volt < 625)
+		return -EINVAL;
+
+	p = pmic_get("MC34VR500");
+	if (!p) {
+		printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
+		return -ENODEV;
+	}
+
+	ret = pmic_probe(p);
+	if (ret)
+		return ret;
+
+	spb = swx_set_point_base[sw];
+	/* The base of SW volt is 625mV and increase by step 25mV */
+	swxvolt = (sw_volt - 625) / 25 + spb;
+	debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
+	if (swxvolt > 63)
+		return -EINVAL;
+
+	ret = pmic_reg_write(p, swxvolt_addr[sw], swxvolt);
+	if (ret)
+		return ret;
+
+	return 0;
+}