misc:pmic:core New generic PMIC driver

I2C or SPI PMIC devices can be accessed.
Separate files: pmic_i2c.c and pmic_spi.c are responsible
for handling transmission over I2C or SPI bus.

New flags:
CONFIG_PMIC - enable PMIC general device.
CONFIG_PMIC_I2C/SPI - specify the interface to be used.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Stefano Babic <sbabic@denx.de>

drivers/misc/Makefile

@@ -35,6 +35,9 @@ COBJS-$(CONFIG_NS87308) += ns87308.o
 COBJS-$(CONFIG_PDSP188x) += pdsp188x.o
 COBJS-$(CONFIG_STATUS_LED) += status_led.o
 COBJS-$(CONFIG_TWL4030_LED) += twl4030_led.o
+COBJS-$(CONFIG_PMIC) += pmic_core.o
+COBJS-$(CONFIG_PMIC_I2C) += pmic_i2c.o
+COBJS-$(CONFIG_PMIC_SPI) += pmic_spi.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

drivers/misc/pmic_core.c

@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic@denx.de
+ *
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <pmic.h>
+
+static struct pmic pmic;
+
+int check_reg(u32 reg)
+{
+	if (reg >= pmic.number_of_regs) {
+		printf("<reg num> = %d is invalid. Should be less than %d\n",
+		       reg, pmic.number_of_regs);
+		return -1;
+	}
+	return 0;
+}
+
+int pmic_set_output(struct pmic *p, u32 reg, int out, int on)
+{
+	u32 val;
+
+	if (pmic_reg_read(p, reg, &val))
+		return -1;
+
+	if (on)
+		val |= out;
+	else
+		val &= ~out;
+
+	if (pmic_reg_write(p, reg, val))
+		return -1;
+
+	return 0;
+}
+
+static void pmic_show_info(struct pmic *p)
+{
+	printf("PMIC: %s\n", p->name);
+}
+
+static void pmic_dump(struct pmic *p)
+{
+	int i, ret;
+	u32 val;
+
+	pmic_show_info(p);
+	for (i = 0; i < p->number_of_regs; i++) {
+		ret = pmic_reg_read(p, i, &val);
+		if (ret)
+			puts("PMIC: Registers dump failed\n");
+
+		if (!(i % 8))
+			printf("\n0x%02x: ", i);
+
+		printf("%08x ", val);
+	}
+	puts("\n");
+}
+
+struct pmic *get_pmic(void)
+{
+	return &pmic;
+}
+
+int do_pmic(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u32 ret, reg, val;
+	char *cmd;
+
+	struct pmic *p = &pmic;
+
+	/* at least two arguments please */
+	if (argc < 2)
+		return cmd_usage(cmdtp);
+
+	cmd = argv[1];
+	if (strcmp(cmd, "dump") == 0) {
+		pmic_dump(p);
+		return 0;
+	}
+
+	if (strcmp(cmd, "read") == 0) {
+		if (argc < 3)
+			return cmd_usage(cmdtp);
+
+		reg = simple_strtoul(argv[2], NULL, 16);
+
+		ret = pmic_reg_read(p, reg, &val);
+
+		if (ret)
+			puts("PMIC: Register read failed\n");
+
+		printf("\n0x%02x: 0x%08x\n", reg, val);
+
+		return 0;
+	}
+
+	if (strcmp(cmd, "write") == 0) {
+		if (argc < 4)
+			return cmd_usage(cmdtp);
+
+		reg = simple_strtoul(argv[2], NULL, 16);
+		val = simple_strtoul(argv[3], NULL, 16);
+
+		pmic_reg_write(p, reg, val);
+
+		return 0;
+	}
+
+	/* No subcommand found */
+	return 1;
+}
+
+U_BOOT_CMD(
+	pmic,	CONFIG_SYS_MAXARGS, 1, do_pmic,
+	"PMIC",
+	"dump - dump PMIC registers\n"
+	"pmic read <reg> - read register\n"
+	"pmic write <reg> <value> - write register"
+);

drivers/misc/pmic_i2c.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic@denx.de
+ *
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <pmic.h>
+#include <i2c.h>
+
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
+{
+	unsigned char buf[4] = { 0 };
+
+	if (check_reg(reg))
+		return -1;
+
+	switch (pmic_i2c_tx_num) {
+	case 3:
+		buf[0] = (val >> 16) & 0xff;
+		buf[1] = (val >> 8) & 0xff;
+		buf[2] = val & 0xff;
+		break;
+	case 1:
+		buf[0] = val & 0xff;
+		break;
+	}
+
+	if (i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
+		return -1;
+
+	return 0;
+}
+
+int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
+{
+	unsigned char buf[4] = { 0 };
+	u32 ret_val = 0;
+
+	if (check_reg(reg))
+		return -1;
+
+	if (i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
+		return -1;
+
+	switch (pmic_i2c_tx_num) {
+	case 3:
+		ret_val = buf[0] << 16 | buf[1] << 8 | buf[2];
+		break;
+	case 1:
+		ret_val = buf[0];
+		break;
+	}
+	memcpy(val, &ret_val, sizeof(ret_val));
+
+	return 0;
+}
+
+int pmic_probe(struct pmic *p)
+{
+	i2c_set_bus_num(p->bus);
+	debug("PMIC:%s probed!\n", p->name);
+	if (i2c_probe(pmic_i2c_addr)) {
+		printf("Can't find PMIC:%s\n", p->name);
+		return -1;
+	}
+
+	return 0;
+}

drivers/misc/pmic_spi.c

@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic@denx.de
+ *
+ * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <linux/types.h>
+#include <pmic.h>
+#include <spi.h>
+
+static struct spi_slave *slave;
+
+void pmic_spi_free(struct spi_slave *slave)
+{
+	if (slave)
+		spi_free_slave(slave);
+}
+
+struct spi_slave *pmic_spi_probe(struct pmic *p)
+{
+	return spi_setup_slave(p->bus,
+		p->hw.spi.cs,
+		p->hw.spi.clk,
+		p->hw.spi.mode);
+}
+
+static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
+{
+	u32 pmic_tx, pmic_rx;
+	u32 tmp;
+
+	if (!slave) {
+		slave = pmic_spi_probe(p);
+
+		if (!slave)
+			return -1;
+	}
+
+	if (check_reg(reg))
+		return -1;
+
+	if (spi_claim_bus(slave))
+		return -1;
+
+	pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
+
+	tmp = cpu_to_be32(pmic_tx);
+
+	if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
+			pmic_spi_flags)) {
+		spi_release_bus(slave);
+		return -1;
+	}
+
+	if (write) {
+		pmic_tx = p->hw.spi.prepare_tx(0, NULL, write);
+		pmic_tx &= ~(1 << 31);
+		tmp = cpu_to_be32(pmic_tx);
+		if (spi_xfer(slave, pmic_spi_bitlen, &tmp, &pmic_rx,
+			pmic_spi_flags)) {
+			spi_release_bus(slave);
+			return -1;
+		}
+	}
+
+	spi_release_bus(slave);
+	*val = cpu_to_be32(pmic_rx);
+
+	return 0;
+}
+
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
+{
+	if (pmic_reg(p, reg, &val, 1))
+		return -1;
+
+	return 0;
+}
+
+int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
+{
+	if (pmic_reg(p, reg, val, 0))
+		return -1;
+
+	return 0;
+}

include/pmic.h

@@ -0,0 +1,71 @@
+/*
+ *  Copyright (C) 2011 Samsung Electronics
+ *  Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __CORE_PMIC_H_
+#define __CORE_PMIC_H_
+
+enum { PMIC_I2C, PMIC_SPI, };
+enum { I2C_PMIC, I2C_NUM, };
+enum { PMIC_READ, PMIC_WRITE, };
+
+struct p_i2c {
+	unsigned char addr;
+	unsigned char *buf;
+	unsigned char tx_num;
+};
+
+struct p_spi {
+	unsigned int cs;
+	unsigned int mode;
+	unsigned int bitlen;
+	unsigned int clk;
+	unsigned int flags;
+	u32 (*prepare_tx)(u32 reg, u32 *val, u32 write);
+};
+
+struct pmic {
+	const char *name;
+	unsigned char bus;
+	unsigned char interface;
+	unsigned char number_of_regs;
+	union hw {
+		struct p_i2c i2c;
+		struct p_spi spi;
+	} hw;
+};
+
+int pmic_init(void);
+int check_reg(u32 reg);
+struct pmic *get_pmic(void);
+int pmic_probe(struct pmic *p);
+int pmic_reg_read(struct pmic *p, u32 reg, u32 *val);
+int pmic_reg_write(struct pmic *p, u32 reg, u32 val);
+int pmic_set_output(struct pmic *p, u32 reg, int ldo, int on);
+
+#define pmic_i2c_addr (p->hw.i2c.addr)
+#define pmic_i2c_tx_num (p->hw.i2c.tx_num)
+
+#define pmic_spi_bitlen (p->hw.spi.bitlen)
+#define pmic_spi_flags (p->hw.spi.flags)
+
+#endif /* __CORE_PMIC_H_ */