276 lines
6.6 KiB
C
276 lines
6.6 KiB
C
/*
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* MFD core driver for Rockchip RK808
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*
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* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
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*
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* Author: Chris Zhong <zyw@rock-chips.com>
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* Author: Zhang Qing <zhangqing@rock-chips.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/rk808.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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struct rk808_reg_data {
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int addr;
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int mask;
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int value;
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};
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static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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/*
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* Notes:
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* - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
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* we don't use that feature. It's better to cache.
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* - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
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* bits are cleared in case when we shutoff anyway, but better safe.
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*/
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switch (reg) {
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case RK808_SECONDS_REG ... RK808_WEEKS_REG:
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case RK808_RTC_STATUS_REG:
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case RK808_VB_MON_REG:
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case RK808_THERMAL_REG:
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case RK808_DCDC_UV_STS_REG:
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case RK808_LDO_UV_STS_REG:
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case RK808_DCDC_PG_REG:
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case RK808_LDO_PG_REG:
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case RK808_DEVCTRL_REG:
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case RK808_INT_STS_REG1:
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case RK808_INT_STS_REG2:
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return true;
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}
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return false;
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}
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static const struct regmap_config rk808_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = RK808_IO_POL_REG,
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = rk808_is_volatile_reg,
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};
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static struct resource rtc_resources[] = {
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{
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.start = RK808_IRQ_RTC_ALARM,
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.end = RK808_IRQ_RTC_ALARM,
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.flags = IORESOURCE_IRQ,
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}
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};
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static const struct mfd_cell rk808s[] = {
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{ .name = "rk808-clkout", },
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{ .name = "rk808-regulator", },
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{
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.name = "rk808-rtc",
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.num_resources = ARRAY_SIZE(rtc_resources),
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.resources = &rtc_resources[0],
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},
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};
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static const struct rk808_reg_data pre_init_reg[] = {
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{ RK808_BUCK3_CONFIG_REG, BUCK_ILMIN_MASK, BUCK_ILMIN_150MA },
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{ RK808_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK, BUCK_ILMIN_200MA },
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{ RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
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{ RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK, BUCK_ILMIN_200MA },
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{ RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK, BUCK_ILMIN_200MA },
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{ RK808_VB_MON_REG, MASK_ALL, VB_LO_ACT |
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VB_LO_SEL_3500MV },
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};
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static const struct regmap_irq rk808_irqs[] = {
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/* INT_STS */
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[RK808_IRQ_VOUT_LO] = {
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.mask = RK808_IRQ_VOUT_LO_MSK,
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.reg_offset = 0,
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},
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[RK808_IRQ_VB_LO] = {
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.mask = RK808_IRQ_VB_LO_MSK,
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.reg_offset = 0,
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},
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[RK808_IRQ_PWRON] = {
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.mask = RK808_IRQ_PWRON_MSK,
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.reg_offset = 0,
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},
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[RK808_IRQ_PWRON_LP] = {
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.mask = RK808_IRQ_PWRON_LP_MSK,
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.reg_offset = 0,
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},
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[RK808_IRQ_HOTDIE] = {
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.mask = RK808_IRQ_HOTDIE_MSK,
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.reg_offset = 0,
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},
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[RK808_IRQ_RTC_ALARM] = {
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.mask = RK808_IRQ_RTC_ALARM_MSK,
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.reg_offset = 0,
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},
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[RK808_IRQ_RTC_PERIOD] = {
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.mask = RK808_IRQ_RTC_PERIOD_MSK,
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.reg_offset = 0,
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},
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/* INT_STS2 */
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[RK808_IRQ_PLUG_IN_INT] = {
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.mask = RK808_IRQ_PLUG_IN_INT_MSK,
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.reg_offset = 1,
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},
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[RK808_IRQ_PLUG_OUT_INT] = {
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.mask = RK808_IRQ_PLUG_OUT_INT_MSK,
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.reg_offset = 1,
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},
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};
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static struct regmap_irq_chip rk808_irq_chip = {
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.name = "rk808",
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.irqs = rk808_irqs,
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.num_irqs = ARRAY_SIZE(rk808_irqs),
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.num_regs = 2,
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.irq_reg_stride = 2,
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.status_base = RK808_INT_STS_REG1,
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.mask_base = RK808_INT_STS_MSK_REG1,
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.ack_base = RK808_INT_STS_REG1,
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.init_ack_masked = true,
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};
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static struct i2c_client *rk808_i2c_client;
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static void rk808_device_shutdown(void)
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{
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int ret;
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struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
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if (!rk808) {
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dev_warn(&rk808_i2c_client->dev,
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"have no rk808, so do nothing here\n");
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return;
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}
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ret = regmap_update_bits(rk808->regmap,
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RK808_DEVCTRL_REG,
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DEV_OFF_RST, DEV_OFF_RST);
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if (ret)
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dev_err(&rk808_i2c_client->dev, "power off error!\n");
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}
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static int rk808_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device_node *np = client->dev.of_node;
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struct rk808 *rk808;
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int pm_off = 0;
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int ret;
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int i;
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if (!client->irq) {
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dev_err(&client->dev, "No interrupt support, no core IRQ\n");
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return -EINVAL;
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}
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rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
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if (!rk808)
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return -ENOMEM;
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rk808->regmap = devm_regmap_init_i2c(client, &rk808_regmap_config);
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if (IS_ERR(rk808->regmap)) {
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dev_err(&client->dev, "regmap initialization failed\n");
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return PTR_ERR(rk808->regmap);
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}
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for (i = 0; i < ARRAY_SIZE(pre_init_reg); i++) {
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ret = regmap_update_bits(rk808->regmap, pre_init_reg[i].addr,
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pre_init_reg[i].mask,
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pre_init_reg[i].value);
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if (ret) {
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dev_err(&client->dev,
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"0x%x write err\n", pre_init_reg[i].addr);
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return ret;
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}
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}
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ret = regmap_add_irq_chip(rk808->regmap, client->irq,
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IRQF_ONESHOT, -1,
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&rk808_irq_chip, &rk808->irq_data);
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if (ret) {
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dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
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return ret;
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}
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rk808->i2c = client;
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i2c_set_clientdata(client, rk808);
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ret = mfd_add_devices(&client->dev, -1,
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rk808s, ARRAY_SIZE(rk808s),
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NULL, 0, regmap_irq_get_domain(rk808->irq_data));
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if (ret) {
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dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
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goto err_irq;
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}
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pm_off = of_property_read_bool(np,
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"rockchip,system-power-controller");
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if (pm_off && !pm_power_off) {
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rk808_i2c_client = client;
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pm_power_off = rk808_device_shutdown;
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}
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return 0;
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err_irq:
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regmap_del_irq_chip(client->irq, rk808->irq_data);
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return ret;
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}
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static int rk808_remove(struct i2c_client *client)
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{
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struct rk808 *rk808 = i2c_get_clientdata(client);
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regmap_del_irq_chip(client->irq, rk808->irq_data);
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mfd_remove_devices(&client->dev);
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pm_power_off = NULL;
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return 0;
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}
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static struct of_device_id rk808_of_match[] = {
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{ .compatible = "rockchip,rk808" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, rk808_of_match);
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static const struct i2c_device_id rk808_ids[] = {
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{ "rk808" },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, rk808_ids);
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static struct i2c_driver rk808_i2c_driver = {
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.driver = {
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.name = "rk808",
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.of_match_table = rk808_of_match,
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},
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.probe = rk808_probe,
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.remove = rk808_remove,
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.id_table = rk808_ids,
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};
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module_i2c_driver(rk808_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
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MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
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MODULE_DESCRIPTION("RK808 PMIC driver");
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