board/freescale/common: ZM7300 driver

Adds Support for PowerOne ZM7300 voltage regulator.
This device is available on some Freescale Boards like B4860QDS
and has to be programmed to adjust the voltage on the board.

The device is accessible via I2C interface.

Signed-off-by: Shaveta Leekha <shaveta@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>

3 files changed, 258 insertions, 0 deletions

diff --git a/board/freescale/common/Makefile b/board/freescale/common/Makefile
index f6a0879..22b57cc 100644
--- a/board/freescale/common/Makefile
+++ b/board/freescale/common/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_P5020DS)		+= ics307_clk.o
 obj-$(CONFIG_P5040DS)		+= ics307_clk.o
 obj-$(CONFIG_VSC_CROSSBAR)    += vsc3316_3308.o
 obj-$(CONFIG_IDT8T49N222A)	+= idt8t49n222a_serdes_clk.o
+obj-$(CONFIG_ZM7300)		+= zm7300.o
 
 # deal with common files for P-series corenet based devices
 obj-$(CONFIG_P2041RDB)	+= p_corenet/
diff --git a/board/freescale/common/zm7300.c b/board/freescale/common/zm7300.c
new file mode 100644
index 0000000..be5953a
--- /dev/null
+++ b/board/freescale/common/zm7300.c
@@ -0,0 +1,235 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+/* Power-One ZM7300 DPM */
+#include "zm7300.h"
+
+#define DPM_WP 0x96
+#define WRP_OPCODE 0x01
+#define WRM_OPCODE 0x02
+#define RRP_OPCODE 0x11
+
+#define DPM_SUCCESS 0x01
+#define DPM_EXEC_FAIL 0x00
+
+static const uint16_t hex_to_1_10mv[] = {
+	5000,
+	5125,
+	5250,
+	5375,
+	5500,
+	5625,
+	5750,
+	5875,
+	6000,
+	6125,
+	6250,
+	6375,
+	6500,
+	6625,
+	6750,
+	6875,
+	7000,
+	7125,
+	7250,
+	7375,
+	7500,
+	7625,
+	7750,
+	7875,
+	8000,
+	8125,
+	8250,
+	8375,
+	8500,
+	8625,
+	8750,
+	8875,
+	9000,
+	9125,
+	9250,
+	9375,
+	9500,  /* 0.95mV */
+	9625,
+	9750,
+	9875,
+	10000,  /* 1.0V */
+	10125,
+	10250,
+	10375,
+	10500,
+	10625,
+	10750,
+	10875,
+	11000,
+	11125,
+	11250,
+	11375,
+	11500,
+	11625,
+	11750,
+	11875,
+	12000,
+	12125,
+	12250,
+	12375,
+	0,	/* reserved */
+};
+
+
+/* Read Data d from Register r of POL p */
+u8 dpm_rrp(uchar r)
+{
+	u8 ret[5];
+
+	ret[0] = RRP_OPCODE;
+	/* POL is 0 */
+	ret[1] = 0;
+	ret[2] = r;
+	i2c_read(I2C_DPM_ADDR, 0, -3, ret, 2);
+	if (ret[1] == DPM_SUCCESS) { /* the DPM returned success as status */
+		debug("RRP_OPCODE returned success data is %x\n", ret[0]);
+		return ret[0];
+	} else {
+		return -1;
+	}
+}
+
+/* Write Data d into DPM register r (RAM) */
+int dpm_wrm(u8 r, u8 d)
+{
+	u8 ret[5];
+
+	ret[0] = WRM_OPCODE;
+	ret[1] = r;
+	ret[2] = d;
+	i2c_read(I2C_DPM_ADDR, 0, -3, ret, 1);
+	if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */
+		debug("WRM_OPCODE returned success data is %x\n", ret[0]);
+		return ret[0];
+	} else {
+		return -1;
+	}
+}
+
+/* Write Data d into Register r of POL(s) a */
+int dpm_wrp(u8 r, u8 d)
+{
+	u8 ret[7];
+
+	ret[0] = WRP_OPCODE;
+	/* only POL0 is present */
+	ret[1] = 0x01;
+	ret[2] = 0x00;
+	ret[3] = 0x00;
+	ret[4] = 0x00;
+	ret[5] = r;
+	ret[6] = d;
+	i2c_read(I2C_DPM_ADDR, 0, -7, ret, 1);
+	if (ret[0] == DPM_SUCCESS) { /* the DPM returned success as status */
+		debug("WRP_OPCODE returned success data is %x\n", ret[0]);
+		return 0;
+	} else {
+		return -1;
+	}
+}
+
+/* Uses the DPM command RRP */
+u8 zm_read(uchar reg)
+{
+	u8 d;
+	d = dpm_rrp(reg);
+	return d;
+}
+
+/* ZM_write --
+	Steps:
+	a. Write data to the register
+	b. Read data from register and compare to written value
+	c. Return return_code & voltage_read
+*/
+u8 zm_write(u8 reg, u8 data)
+{
+	u8 d;
+
+	/* write data to register */
+	dpm_wrp(reg, data);
+
+	/* read register and compare to written value */
+	d = dpm_rrp(reg);
+	if (d != data) {
+		printf("zm_write : Comparison register data failed\n");
+		return -1;
+	}
+
+	return d;
+}
+
+/* zm_write_out_voltage
+ * voltage in 1/10 mV
+ */
+int zm_write_voltage(int voltage)
+{
+	u8 reg = 0x7, vid;
+	uint16_t voltage_read;
+	u8 ret;
+
+	vid =  (voltage - 5000) / ZM_STEP;
+
+	ret = zm_write(reg, vid);
+	if (ret != -1) {
+		voltage_read = hex_to_1_10mv[ret];
+		debug("voltage set to %dmV\n", voltage_read/10);
+		return voltage_read;
+	}
+	return -1;
+}
+
+/* zm_read_out_voltage
+ * voltage in 1/10 mV
+ */
+int zm_read_voltage(void)
+{
+	u8 reg = 0x7;
+	u8 ret;
+	int voltage;
+
+	ret = zm_read(reg);
+	if (ret != -1) {
+		voltage =  hex_to_1_10mv[ret];
+		debug("Voltage read is %dmV\n", voltage/10);
+		return voltage;
+	} else {
+		return -1;
+	}
+}
+
+int zm_disable_wp()
+{
+	u8 new_wp_value;
+
+	/* Disable using Write-Protect register 0x96 */
+	new_wp_value = 0x8;
+	if ((dpm_wrm(DPM_WP, new_wp_value)) < 0) {
+		printf("Disable Write-Protect register failed\n");
+		return -1;
+	}
+	return 0;
+}
+
+int zm_enable_wp()
+{
+	u8 orig_wp_value;
+	orig_wp_value = 0x0;
+
+	/* Enable using Write-Protect register 0x96 */
+	if ((dpm_wrm(DPM_WP, orig_wp_value)) < 0) {
+		printf("Enable Write-Protect register failed\n");
+		return -1;
+	}
+	return 0;
+}
+
diff --git a/board/freescale/common/zm7300.h b/board/freescale/common/zm7300.h
new file mode 100644
index 0000000..6b4d035
--- /dev/null
+++ b/board/freescale/common/zm7300.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __ZM7300_H_
+#define __ZM7300_H	1_
+
+#include <common.h>
+#include <i2c.h>
+#include <errno.h>
+#include <asm/io.h>
+
+#define ZM_STEP 125
+int zm7300_set_voltage(int voltage_1_10mv);
+int zm_write_voltage(int voltage);
+int zm_read_voltage(void);
+int zm_disable_wp(void);
+int zm_enable_wp(void);
+
+#endif	/* __ZM7300_H_ */