[U-Boot] [PATCH v2 1/3] misc:pmic:core New generic PMIC driver
Lukasz Majewski
l.majewski at samsung.com
Tue Oct 4 07:45:49 CEST 2011
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 at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Stefano Babic <sbabic at denx.de>
---
Changes for v2:
- pmic_reg_write(..., u32 *val) - u32 *val replaced with u32 val.
- debug() macros added instead of plain printf()
---
drivers/misc/Makefile | 3 +
drivers/misc/pmic_core.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/misc/pmic_i2c.c | 92 +++++++++++++++++++++++++++++
drivers/misc/pmic_spi.c | 109 ++++++++++++++++++++++++++++++++++
include/pmic.h | 71 ++++++++++++++++++++++
5 files changed, 422 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/pmic_core.c
create mode 100644 drivers/misc/pmic_i2c.c
create mode 100644 drivers/misc/pmic_spi.c
create mode 100644 include/pmic.h
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index b152486..91c5bfa 100644
--- a/drivers/misc/Makefile
+++ b/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)
diff --git a/drivers/misc/pmic_core.c b/drivers/misc/pmic_core.c
new file mode 100644
index 0000000..5d62a56
--- /dev/null
+++ b/drivers/misc/pmic_core.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski at samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic at 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"
+);
diff --git a/drivers/misc/pmic_i2c.c b/drivers/misc/pmic_i2c.c
new file mode 100644
index 0000000..b82e899
--- /dev/null
+++ b/drivers/misc/pmic_i2c.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski at samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic at 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;
+}
diff --git a/drivers/misc/pmic_spi.c b/drivers/misc/pmic_spi.c
new file mode 100644
index 0000000..ff35377
--- /dev/null
+++ b/drivers/misc/pmic_spi.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski at samsung.com>
+ *
+ * (C) Copyright 2010
+ * Stefano Babic, DENX Software Engineering, sbabic at 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;
+}
diff --git a/include/pmic.h b/include/pmic.h
new file mode 100644
index 0000000..052371a
--- /dev/null
+++ b/include/pmic.h
@@ -0,0 +1,71 @@
+/*
+ * 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 *buf;
+ unsigned char tx_num;
+};
+
+struct p_spi {
+ unsigned char cs;
+ unsigned char mode;
+ unsigned char 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_ */
--
1.7.2.3
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