ARM: i.MX: karo-tx6: Setup other PMICs

The TX6 boards come with 3 different PMIC variants from which we
currently only support the ltc3673. Detect the other two by i2c
address and set them up correctly. The code is based on the karo
U-Boot port.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 158 insertions, 0 deletions

diff --git a/arch/arm/boards/karo-tx6x/pmic-rn5t567.c b/arch/arm/boards/karo-tx6x/pmic-rn5t567.c
new file mode 100644
index 0000000000..5397592c3c
--- /dev/null
+++ b/arch/arm/boards/karo-tx6x/pmic-rn5t567.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2014 Lothar Waßmann <LW@KARO-electronics.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <i2c/i2c.h>
+#include "pmic.h"
+
+#define RN5T567_NOETIMSET	0x11
+#define RN5T567_LDORTC1_SLOT	0x2a
+#define RN5T567_DC1CTL		0x2c
+#define RN5T567_DC1CTL2		0x2d
+#define RN5T567_DC2CTL		0x2e
+#define RN5T567_DC2CTL2		0x2f
+#define RN5T567_DC3CTL		0x30
+#define RN5T567_DC3CTL2		0x31
+#define RN5T567_DC1DAC		0x36 /* CORE */
+#define RN5T567_DC2DAC		0x37 /* SOC */
+#define RN5T567_DC3DAC		0x38 /* DDR */
+#define RN5T567_DC1DAC_SLP	0x3b
+#define RN5T567_DC2DAC_SLP	0x3c
+#define RN5T567_DC3DAC_SLP	0x3d
+#define RN5T567_LDOEN1		0x44
+#define RN5T567_LDODIS		0x46
+#define RN5T567_LDOEN2		0x48
+#define RN5T567_LDO3DAC		0x4e /* IO */
+#define RN5T567_LDORTC1DAC	0x56 /* VBACKUP */
+
+#define NOETIMSET_DIS_OFF_NOE_TIM	(1 << 3)
+
+#define VDD_RTC_VAL		mV_to_regval_rtc(3000)
+#define VDD_HIGH_VAL		mV_to_regval3(3000)
+#define VDD_HIGH_VAL_LP		mV_to_regval3(3000)
+#define VDD_CORE_VAL		mV_to_regval(1350)		/* DCDC1 */
+#define VDD_CORE_VAL_LP		mV_to_regval(900)
+#define VDD_SOC_VAL		mV_to_regval(1350)		/* DCDC2 */
+#define VDD_SOC_VAL_LP		mV_to_regval(900)
+#define VDD_DDR_VAL		mV_to_regval(1350)		/* DCDC3 */
+#define VDD_DDR_VAL_LP		mV_to_regval(1350)
+
+/* calculate voltages in 10mV */
+#define v2r(v,n,m)		DIV_ROUND(((((v) < (n)) ? (n) : (v)) - (n)), (m))
+#define r2v(r,n,m)		(((r) * (m) + (n)) / 10)
+
+/* DCDC1-3 */
+#define mV_to_regval(mV)	v2r((mV) * 10, 6000, 125)
+#define regval_to_mV(r)		r2v(r, 6000, 125)
+
+/* LDO1-2 */
+#define mV_to_regval2(mV)	v2r((mV) * 10, 9000, 250)
+#define regval2_to_mV(r)	r2v(r, 9000, 250)
+
+/* LDO3 */
+#define mV_to_regval3(mV)	v2r((mV) * 10, 6000, 250)
+#define regval3_to_mV(r)	r2v(r, 6000, 250)
+
+/* LDORTC */
+#define mV_to_regval_rtc(mV)	v2r((mV) * 10, 17000, 250)
+#define regval_rtc_to_mV(r)	r2v(r, 17000, 250)
+
+static struct rn5t567_regs {
+	u8 addr;
+	u8 val;
+	u8 mask;
+} rn5t567_regs[] = {
+	{ RN5T567_NOETIMSET, NOETIMSET_DIS_OFF_NOE_TIM | 0x5, },
+	{ RN5T567_DC1DAC, VDD_CORE_VAL, },
+	{ RN5T567_DC2DAC, VDD_SOC_VAL, },
+	{ RN5T567_DC3DAC, VDD_DDR_VAL, },
+	{ RN5T567_DC1DAC_SLP, VDD_CORE_VAL_LP, },
+	{ RN5T567_DC2DAC_SLP, VDD_SOC_VAL_LP, },
+	{ RN5T567_DC3DAC_SLP, VDD_DDR_VAL_LP, },
+	{ RN5T567_LDOEN1, 0x01f, ~0x1f, },
+	{ RN5T567_LDOEN2, 0x10, ~0x30, },
+	{ RN5T567_LDODIS, 0x00, },
+	{ RN5T567_LDO3DAC, VDD_HIGH_VAL, },
+	{ RN5T567_LDORTC1DAC, VDD_RTC_VAL, },
+	{ RN5T567_LDORTC1_SLOT, 0x0f, ~0x3f, },
+};
+
+static int rn5t567_setup_regs(struct i2c_client *client, struct rn5t567_regs *r,
+			size_t count)
+{
+	int ret;
+	int i;
+
+	for (i = 0; i < count; i++, r++) {
+#ifdef DEBUG
+		unsigned char value;
+
+		ret = i2c_read_reg(client, r->addr, &value, 1);
+		if ((value & ~r->mask) != r->val) {
+			pr_debug("Changing PMIC reg %02x from %02x to %02x\n",
+				r->addr, value, r->val);
+		}
+		if (ret != 1) {
+			pr_debug("%s: failed to read PMIC register %02x: %d\n",
+				__func__, r->addr, ret);
+			return ret;
+		}
+#endif
+		ret = i2c_write_reg(client, r->addr, &r->val, 1);
+		if (ret != 1) {
+			pr_err("%s: failed to write PMIC register %02x: %d\n",
+				__func__, r->addr, ret);
+			return ret;
+		}
+	}
+	return 0;
+}
+
+int rn5t567_pmic_setup(struct i2c_client *client)
+{
+	int ret;
+	unsigned char value;
+
+	ret = i2c_read_reg(client, 0x11, &value, 1);
+	if (ret != 1) {
+		pr_err("i2c read error\n");
+		return ret;
+	}
+
+	ret = rn5t567_setup_regs(client, rn5t567_regs,
+				ARRAY_SIZE(rn5t567_regs));
+	if (ret)
+		return ret;
+
+	ret = i2c_read_reg(client, RN5T567_DC1DAC, &value, 1);
+	if (ret == 1) {
+		pr_debug("VDDCORE set to %umV\n", regval_to_mV(value));
+	} else {
+		pr_err("i2c read error\n");
+		return ret;
+	}
+
+	ret = i2c_read_reg(client, RN5T567_DC2DAC, &value, 1);
+	if (ret == 1) {
+		pr_debug("VDDSOC  set to %umV\n", regval_to_mV(value));
+	} else {
+		pr_err("i2c read error\n");
+		return ret;
+	}
+
+	return 0;
+}