434 lines
9.0 KiB
C
434 lines
9.0 KiB
C
/*
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* Copyright (C) 2007 Sascha Hauer, Pengutronix
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* 2009 Marc Kleine-Budde <mkl@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <driver.h>
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#include <xfuncs.h>
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#include <errno.h>
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#include <malloc.h>
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#include <of.h>
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#include <i2c/i2c.h>
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#include <spi/spi.h>
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#include <mfd/mc13xxx.h>
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#define DRIVERNAME "mc13xxx"
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struct mc13xxx {
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struct cdev cdev;
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union {
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struct i2c_client *client;
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struct spi_device *spi;
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};
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int revision;
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int (*reg_read)(struct mc13xxx*, u8, u32*);
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int (*reg_write)(struct mc13xxx*, u8, u32);
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};
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struct mc13xxx_devtype {
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int (*revision)(struct mc13xxx*);
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};
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#define to_mc13xxx(a) container_of(a, struct mc13xxx, cdev)
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static struct mc13xxx *mc_dev;
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struct mc13xxx *mc13xxx_get(void)
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{
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return mc_dev;
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}
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EXPORT_SYMBOL(mc13xxx_get);
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int mc13xxx_revision(struct mc13xxx *mc13xxx)
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{
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return mc13xxx->revision;
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}
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EXPORT_SYMBOL(mc13xxx_revision);
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static void(*mc13xxx_init_callback)(struct mc13xxx *mc13xxx);
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int mc13xxx_register_init_callback(void(*callback)(struct mc13xxx *mc13xxx))
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{
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if (mc13xxx_init_callback)
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return -EBUSY;
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mc13xxx_init_callback = callback;
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if (mc_dev)
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mc13xxx_init_callback(mc_dev);
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return 0;
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}
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#ifdef CONFIG_SPI
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static int spi_rw(struct spi_device *spi, void * buf, size_t len)
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{
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int ret;
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struct spi_transfer t = {
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.tx_buf = (const void *)buf,
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.rx_buf = buf,
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.len = len,
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.cs_change = 0,
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.delay_usecs = 0,
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};
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struct spi_message m;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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if ((ret = spi_sync(spi, &m)))
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return ret;
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return 0;
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}
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#define MXC_PMIC_REG_NUM(reg) (((reg) & 0x3f) << 25)
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#define MXC_PMIC_WRITE (1 << 31)
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static int mc13xxx_spi_reg_read(struct mc13xxx *mc13xxx, u8 reg, u32 *val)
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{
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uint32_t buf;
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buf = MXC_PMIC_REG_NUM(reg);
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spi_rw(mc13xxx->spi, &buf, 4);
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*val = buf;
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return 0;
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}
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static int mc13xxx_spi_reg_write(struct mc13xxx *mc13xxx, u8 reg, u32 val)
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{
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uint32_t buf = MXC_PMIC_REG_NUM(reg) | MXC_PMIC_WRITE | (val & 0xffffff);
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spi_rw(mc13xxx->spi, &buf, 4);
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return 0;
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}
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#endif
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#ifdef CONFIG_I2C
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static int mc13xxx_i2c_reg_read(struct mc13xxx *mc13xxx, u8 reg, u32 *val)
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{
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u8 buf[3];
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int ret;
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ret = i2c_read_reg(mc13xxx->client, reg, buf, 3);
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*val = buf[0] << 16 | buf[1] << 8 | buf[2] << 0;
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return ret == 3 ? 0 : ret;
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}
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static int mc13xxx_i2c_reg_write(struct mc13xxx *mc13xxx, u8 reg, u32 val)
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{
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u8 buf[] = {
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val >> 16,
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val >> 8,
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val >> 0,
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};
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int ret;
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ret = i2c_write_reg(mc13xxx->client, reg, buf, 3);
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return ret == 3 ? 0 : ret;
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}
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#endif
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int mc13xxx_reg_write(struct mc13xxx *mc13xxx, u8 reg, u32 val)
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{
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return mc13xxx->reg_write(mc13xxx, reg, val);
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}
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EXPORT_SYMBOL(mc13xxx_reg_write);
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int mc13xxx_reg_read(struct mc13xxx *mc13xxx, u8 reg, u32 *val)
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{
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return mc13xxx->reg_read(mc13xxx, reg, val);
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}
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EXPORT_SYMBOL(mc13xxx_reg_read);
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int mc13xxx_set_bits(struct mc13xxx *mc13xxx, u8 reg, u32 mask, u32 val)
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{
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u32 tmp;
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int err;
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err = mc13xxx_reg_read(mc13xxx, reg, &tmp);
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tmp = (tmp & ~mask) | val;
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if (!err)
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err = mc13xxx_reg_write(mc13xxx, reg, tmp);
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return err;
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}
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EXPORT_SYMBOL(mc13xxx_set_bits);
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static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct mc13xxx *mc13xxx = to_mc13xxx(cdev);
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u32 *buf = _buf;
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size_t i = count >> 2;
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int err;
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offset >>= 2;
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while (i) {
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err = mc13xxx_reg_read(mc13xxx, offset, buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static ssize_t mc_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct mc13xxx *mc13xxx = to_mc13xxx(cdev);
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const u32 *buf = _buf;
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size_t i = count >> 2;
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int err;
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offset >>= 2;
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while (i) {
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err = mc13xxx_reg_write(mc13xxx, offset, *buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static struct file_operations mc_fops = {
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.lseek = dev_lseek_default,
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.read = mc_read,
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.write = mc_write,
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};
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static int __init mc13783_revision(struct mc13xxx *mc13xxx)
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{
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unsigned int rev_id;
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char revstr[5];
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int rev;
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mc13xxx_reg_read(mc13xxx, MC13XXX_REG_IDENTIFICATION, &rev_id);
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if (((rev_id >> 6) & 0x7) != 0x2)
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return -ENODEV;
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rev = (((rev_id & 0x18) >> 3) << 4) | (rev_id & 0x7);
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/* Ver 0.2 is actually 3.2a. Report as 3.2 */
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if (rev == 0x02) {
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rev = 0x32;
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strcpy(revstr, "3.2a");
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} else
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sprintf(revstr, "%d.%d", rev / 0x10, rev % 10);
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dev_info(mc_dev->cdev.dev, "Found MC13783 ID: 0x%06x [Rev: %s]\n",
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rev_id, revstr);
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return rev;
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}
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static struct __init {
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u16 rev_id;
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int rev;
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char *revstr;
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} mc13892_revisions[] = {
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{ 0x01, MC13892_REVISION_1_0, "1.0" },
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{ 0x09, MC13892_REVISION_1_1, "1.1" },
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{ 0x0a, MC13892_REVISION_1_2, "1.2" },
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{ 0x10, MC13892_REVISION_2_0, "2.0" },
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{ 0x11, MC13892_REVISION_2_1, "2.1" },
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{ 0x18, MC13892_REVISION_3_0, "3.0" },
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{ 0x19, MC13892_REVISION_3_1, "3.1" },
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{ 0x1a, MC13892_REVISION_3_2, "3.2" },
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{ 0x02, MC13892_REVISION_3_2a, "3.2a" },
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{ 0x1b, MC13892_REVISION_3_3, "3.3" },
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{ 0x1d, MC13892_REVISION_3_5, "3.5" },
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};
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static int __init mc13892_revision(struct mc13xxx *mc13xxx)
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{
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unsigned int rev_id;
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char revstr[5];
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int rev, i;
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mc13xxx_reg_read(mc13xxx, MC13XXX_REG_IDENTIFICATION, &rev_id);
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if (((rev_id >> 6) & 0x7) != 0x7)
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return -ENODEV;
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for (i = 0; i < ARRAY_SIZE(mc13892_revisions); i++)
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if ((rev_id & 0x1f) == mc13892_revisions[i].rev_id)
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break;
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if (i == ARRAY_SIZE(mc13892_revisions))
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return -ENOSYS;
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rev = mc13892_revisions[i].rev;
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strcpy(revstr, mc13892_revisions[i].revstr);
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if (rev == MC13892_REVISION_2_0) {
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if ((rev_id >> 9) & 0x3) {
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rev = MC13892_REVISION_2_0a;
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strcpy(revstr, "2.0a");
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}
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}
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dev_info(mc_dev->cdev.dev, "Found MC13892 ID: 0x%06x [Rev: %s]\n",
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rev_id, revstr);
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return rev;
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}
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static int __init mc34708_revision(struct mc13xxx *mc13xxx)
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{
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unsigned int rev_id;
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mc13xxx_reg_read(mc13xxx, MC13XXX_REG_IDENTIFICATION, &rev_id);
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if (rev_id > 0xfff)
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return -ENODEV;
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dev_info(mc_dev->cdev.dev, "Found MC34708 ID: 0x%03x\n", rev_id);
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return (int)rev_id;
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}
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static int __init mc13xxx_probe(struct device_d *dev)
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{
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struct mc13xxx_devtype *devtype;
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int ret, rev;
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if (mc_dev)
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return -EBUSY;
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ret = dev_get_drvdata(dev, (unsigned long *)&devtype);
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if (ret)
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return ret;
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mc_dev = xzalloc(sizeof(*mc_dev));
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mc_dev->cdev.name = DRIVERNAME;
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#ifdef CONFIG_I2C
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if (dev->bus == &i2c_bus) {
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mc_dev->client = to_i2c_client(dev);
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mc_dev->reg_read = mc13xxx_i2c_reg_read;
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mc_dev->reg_write = mc13xxx_i2c_reg_write;
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}
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#endif
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#ifdef CONFIG_SPI
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if (dev->bus == &spi_bus) {
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mc_dev->spi = dev->type_data;
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mc_dev->spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
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mc_dev->spi->bits_per_word = 32;
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mc_dev->spi->max_speed_hz = 20000000;
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mc_dev->reg_read = mc13xxx_spi_reg_read;
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mc_dev->reg_write = mc13xxx_spi_reg_write;
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}
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#endif
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mc_dev->cdev.size = 256;
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mc_dev->cdev.dev = dev;
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mc_dev->cdev.ops = &mc_fops;
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rev = devtype->revision(mc_dev);
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if (rev < 0) {
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dev_err(mc_dev->cdev.dev, "No PMIC detected.\n");
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free(mc_dev);
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mc_dev = NULL;
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return rev;
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}
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mc_dev->revision = rev;
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devfs_create(&mc_dev->cdev);
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if (mc13xxx_init_callback)
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mc13xxx_init_callback(mc_dev);
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return 0;
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}
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static struct mc13xxx_devtype mc13783_devtype = {
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.revision = mc13783_revision,
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};
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static struct mc13xxx_devtype mc13892_devtype = {
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.revision = mc13892_revision,
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};
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static struct mc13xxx_devtype mc34708_devtype = {
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.revision = mc34708_revision,
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};
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static struct platform_device_id mc13xxx_ids[] = {
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{ .name = "mc13783", .driver_data = (ulong)&mc13783_devtype, },
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{ .name = "mc13892", .driver_data = (ulong)&mc13892_devtype, },
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{ .name = "mc34708", .driver_data = (ulong)&mc34708_devtype, },
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{ }
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};
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static __maybe_unused struct of_device_id mc13xxx_dt_ids[] = {
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{ .compatible = "fsl,mc13783", .data = (ulong)&mc13783_devtype, },
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{ .compatible = "fsl,mc13892", .data = (ulong)&mc13892_devtype, },
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{ .compatible = "fsl,mc34708", .data = (ulong)&mc34708_devtype, },
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{ }
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};
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static struct driver_d mc13xxx_i2c_driver = {
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.name = "mc13xxx-i2c",
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.probe = mc13xxx_probe,
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.id_table = mc13xxx_ids,
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.of_compatible = DRV_OF_COMPAT(mc13xxx_dt_ids),
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};
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static struct driver_d mc13xxx_spi_driver = {
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.name = "mc13xxx-spi",
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.probe = mc13xxx_probe,
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.id_table = mc13xxx_ids,
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.of_compatible = DRV_OF_COMPAT(mc13xxx_dt_ids),
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};
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static int __init mc13xxx_init(void)
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{
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int err_spi = 0, err_i2c = 0;
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if (IS_ENABLED(CONFIG_I2C))
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err_spi = i2c_driver_register(&mc13xxx_i2c_driver);
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if (IS_ENABLED(CONFIG_SPI))
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err_i2c = spi_driver_register(&mc13xxx_spi_driver);
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if (err_spi)
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return err_spi;
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if (err_i2c)
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return err_i2c;
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return 0;
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}
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coredevice_initcall(mc13xxx_init);
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