From: Łukasz Majewski Date: Thu, 6 Oct 2011 02:37:34 +0000 (+0000) Subject: misc:pmic:core New generic PMIC driver X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e542b7f0a28f0a0ccb0921ed97f38e47afbb40d8;p=project%2Fbcm63xx%2Fu-boot.git 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 Signed-off-by: Kyungmin Park Cc: Stefano Babic --- diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index b152486116..91c5bfa38d 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 0000000000..5d62a56d34 --- /dev/null +++ b/drivers/misc/pmic_core.c @@ -0,0 +1,147 @@ +/* + * Copyright (C) 2011 Samsung Electronics + * Lukasz Majewski + * + * (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 +#include +#include + +static struct pmic pmic; + +int check_reg(u32 reg) +{ + if (reg >= pmic.number_of_regs) { + printf(" = %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 - read register\n" + "pmic write - write register" +); diff --git a/drivers/misc/pmic_i2c.c b/drivers/misc/pmic_i2c.c new file mode 100644 index 0000000000..b82e8997e0 --- /dev/null +++ b/drivers/misc/pmic_i2c.c @@ -0,0 +1,92 @@ +/* + * Copyright (C) 2011 Samsung Electronics + * Lukasz Majewski + * + * (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 +#include +#include +#include + +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 0000000000..ff35377afc --- /dev/null +++ b/drivers/misc/pmic_spi.c @@ -0,0 +1,109 @@ +/* + * Copyright (C) 2011 Samsung Electronics + * Lukasz Majewski + * + * (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 +#include +#include +#include + +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 0000000000..52a1526d95 --- /dev/null +++ b/include/pmic.h @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2011 Samsung Electronics + * Lukasz Majewski + * + * 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_ */