[U-Boot] [RFC 1/2] misc:pmic New generic pmic driver
Lukasz Majewski
l.majewski at samsung.com
Mon Sep 19 17:06:05 CEST 2011
This commit adds new PMIC core driver
PMIC IC devices connected via I2C or SPI can be used.
Signed-off-by: Lukasz Majewski <l.majewski at samsung.com>
---
arch/arm/lib/board.c | 5 +
drivers/misc/Makefile | 1 +
drivers/misc/pmic_core.c | 236 ++++++++++++++++++++++++++++++++++++++++++++++
include/pmic.h | 60 ++++++++++++
4 files changed, 302 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/pmic_core.c
create mode 100644 include/pmic.h
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index c899839..bd2c619 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -48,6 +48,7 @@
#include <nand.h>
#include <onenand_uboot.h>
#include <mmc.h>
+#include <pmic.h>
#ifdef CONFIG_BITBANGMII
#include <miiphy.h>
@@ -580,6 +581,10 @@ void board_init_r(gd_t *id, ulong dest_addr)
copy_filename(BootFile, s, sizeof(BootFile));
#endif
+#if defined(CONFIG_PMIC)
+ pmic_init();
+#endif
+
#ifdef BOARD_LATE_INIT
board_late_init();
#endif
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index b152486..f710a29 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -35,6 +35,7 @@ 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 := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
diff --git a/drivers/misc/pmic_core.c b/drivers/misc/pmic_core.c
new file mode 100644
index 0000000..d96bb87
--- /dev/null
+++ b/drivers/misc/pmic_core.c
@@ -0,0 +1,236 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski at samsung.com>
+ *
+ * (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;
+
+#ifdef CONFIG_PMIC_I2C
+#include <i2c.h>
+#define pmic_set_reg(r) (p->hw.i2c.reg = r)
+#define pmic_set_addr(a) (p->hw.i2c.addr = a)
+#define pmic_i2c_addr (p->hw.i2c.addr)
+#define pmic_i2c_reg (p->hw.i2c.reg)
+#define pmic_tx_num (p->hw.i2c.tx_num)
+#define pmic_i2c_bus (p->hw.i2c.bus_num)
+
+int pmic_reg_write(struct pmic *p, u32 *val)
+{
+ unsigned char buf[4] = { 0 };
+
+ switch (pmic_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, pmic_i2c_reg, 1, buf, pmic_tx_num))
+ return -1;
+
+ return 0;
+}
+
+int pmic_reg_read(struct pmic *p, u32 *val)
+{
+ unsigned char buf[4] = { 0 };
+ u32 ret_val = 0;
+
+ if (i2c_read(pmic_i2c_addr, pmic_i2c_reg, 1, buf, pmic_tx_num))
+ return -1;
+
+ switch (pmic_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));
+ /* printf("val 0x%x:", *val); */
+
+ return 0;
+}
+
+int pmic_probe(struct pmic *p)
+{
+ i2c_set_bus_num(pmic_i2c_bus);
+ printf("PMIC:%s probed!\n", p->name);
+ if (i2c_probe(pmic_i2c_addr)) {
+ puts("Can't find max8998\n");
+ return -1;
+ }
+
+ return 0;
+}
+#else /* SPI interface */
+#include <spi.h>
+static struct spi_slave *slave;
+
+#define pmic_set_reg(r)
+#define pmic_set_addr(a)
+
+void pmic_spi_free(struct spi_slave *slave)
+{
+ if (slave)
+ spi_free_slave(slave);
+}
+
+
+int pmic_reg_write(struct pmic *p, u32 *val)
+{
+ return 0;
+}
+
+int pmic_reg_read(struct pmic *p, u32 *val)
+{
+ return 0;
+}
+#endif
+
+int __attribute__((weak)) board_pmic_init(struct pmic *p)
+{
+ puts("weak function");
+ return 0;
+}
+
+int pmic_set_output(struct pmic *p, int out, int on)
+{
+ u32 val;
+
+ if (pmic_reg_read(p, &val))
+ return -1;
+
+ if (on)
+ val |= out;
+ else
+ val &= ~out;
+
+ if (pmic_reg_write(p, &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++) {
+ pmic_set_reg(i);
+ ret = pmic_reg_read(p, &val);
+ if (ret)
+ puts("PMIC: Registers dump failed\n");
+
+ if (!(i % 8))
+ printf ("\n0x%02x: ", i);
+
+ printf("%08x ", val);
+ }
+ puts("\n");
+}
+
+
+int pmic_init(void)
+{
+ return board_pmic_init(&pmic);
+}
+
+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);
+
+ pmic_set_reg(reg);
+ ret = pmic_reg_read(p, &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_set_reg(reg);
+ pmic_reg_write(p, &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"
+ "pmic write <reg> <value> - write register"
+);
diff --git a/include/pmic.h b/include/pmic.h
new file mode 100644
index 0000000..a048ec7
--- /dev/null
+++ b/include/pmic.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski at 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 reg;
+ unsigned char *buf;
+ unsigned char tx_num;
+ unsigned char bus_num;
+};
+
+struct p_spi {
+ unsigned int flags;
+};
+
+struct pmic {
+ char *name;
+ unsigned char interface;
+ unsigned char number_of_regs;
+ union hw {
+ struct p_i2c i2c;
+ struct p_spi spi;
+ } hw;
+};
+
+int pmic_init(void);
+struct pmic *get_pmic(void);
+int pmic_probe(struct pmic *p);
+int pmic_read_reg(struct pmic *p, u32 *val);
+int pmic_write_reg(struct pmic *p, u32 *val);
+int pmic_set_output(struct pmic *p, int ldo, int on);
+
+#endif /* __CORE_PMIC_H_ */
--
1.7.2.3
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