258 lines
6.7 KiB
C
258 lines
6.7 KiB
C
/*
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* Core driver for STw4810/STw4811
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*
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* Copyright (C) 2013 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/stw481x.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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/*
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* This driver can only access the non-USB portions of STw4811, the register
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* range 0x00-0x10 dealing with USB is bound to the two special I2C pins used
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* for USB control.
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*/
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/* Registers inside the power control address space */
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#define STW_PC_VCORE_SEL 0x05U
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#define STW_PC_VAUX_SEL 0x06U
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#define STW_PC_VPLL_SEL 0x07U
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/**
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* stw481x_get_pctl_reg() - get a power control register
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* @stw481x: handle to the stw481x chip
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* @reg: power control register to fetch
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*
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* The power control registers is a set of one-time-programmable registers
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* in its own register space, accessed by writing addess bits to these
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* two registers: bits 7,6,5 of PCTL_REG_LO corresponds to the 3 LSBs of
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* the address and bits 8,9 of PCTL_REG_HI corresponds to the 2 MSBs of
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* the address, forming an address space of 5 bits, i.e. 32 registers
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* 0x00 ... 0x1f can be obtained.
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*/
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static int stw481x_get_pctl_reg(struct stw481x *stw481x, u8 reg)
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{
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u8 msb = (reg >> 3) & 0x03;
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u8 lsb = (reg << 5) & 0xe0;
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unsigned int val;
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u8 vrfy;
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int ret;
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ret = regmap_write(stw481x->map, STW_PCTL_REG_HI, msb);
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if (ret)
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return ret;
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ret = regmap_write(stw481x->map, STW_PCTL_REG_LO, lsb);
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if (ret)
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return ret;
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ret = regmap_read(stw481x->map, STW_PCTL_REG_HI, &val);
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if (ret)
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return ret;
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vrfy = (val & 0x03) << 3;
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ret = regmap_read(stw481x->map, STW_PCTL_REG_LO, &val);
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if (ret)
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return ret;
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vrfy |= ((val >> 5) & 0x07);
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if (vrfy != reg)
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return -EIO;
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return (val >> 1) & 0x0f;
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}
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static int stw481x_startup(struct stw481x *stw481x)
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{
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/* Voltages multiplied by 100 */
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u8 vcore_val[] = { 100, 105, 110, 115, 120, 122, 124, 126, 128,
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130, 132, 134, 136, 138, 140, 145 };
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u8 vpll_val[] = { 105, 120, 130, 180 };
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u8 vaux_val[] = { 15, 18, 25, 28 };
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u8 vcore;
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u8 vcore_slp;
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u8 vpll;
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u8 vaux;
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bool vaux_en;
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bool it_warn;
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int ret;
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unsigned int val;
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ret = regmap_read(stw481x->map, STW_CONF1, &val);
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if (ret)
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return ret;
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vaux_en = !!(val & STW_CONF1_PDN_VAUX);
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it_warn = !!(val & STW_CONF1_IT_WARN);
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dev_info(&stw481x->client->dev, "voltages %s\n",
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(val & STW_CONF1_V_MONITORING) ? "OK" : "LOW");
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dev_info(&stw481x->client->dev, "MMC level shifter %s\n",
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(val & STW_CONF1_MMC_LS_STATUS) ? "high impedance" : "ON");
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dev_info(&stw481x->client->dev, "VMMC: %s\n",
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(val & STW_CONF1_PDN_VMMC) ? "ON" : "disabled");
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dev_info(&stw481x->client->dev, "STw481x power control registers:\n");
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VCORE_SEL);
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if (ret < 0)
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return ret;
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vcore = ret & 0x0f;
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VAUX_SEL);
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if (ret < 0)
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return ret;
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vaux = (ret >> 2) & 3;
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vpll = (ret >> 4) & 1; /* Save bit 4 */
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ret = stw481x_get_pctl_reg(stw481x, STW_PC_VPLL_SEL);
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if (ret < 0)
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return ret;
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vpll |= (ret >> 1) & 2;
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dev_info(&stw481x->client->dev, "VCORE: %u.%uV %s\n",
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vcore_val[vcore] / 100, vcore_val[vcore] % 100,
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(ret & 4) ? "ON" : "OFF");
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dev_info(&stw481x->client->dev, "VPLL: %u.%uV %s\n",
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vpll_val[vpll] / 100, vpll_val[vpll] % 100,
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(ret & 0x10) ? "ON" : "OFF");
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dev_info(&stw481x->client->dev, "VAUX: %u.%uV %s\n",
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vaux_val[vaux] / 10, vaux_val[vaux] % 10,
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vaux_en ? "ON" : "OFF");
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ret = regmap_read(stw481x->map, STW_CONF2, &val);
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if (ret)
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return ret;
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dev_info(&stw481x->client->dev, "TWARN: %s threshold, %s\n",
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it_warn ? "below" : "above",
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(val & STW_CONF2_MASK_TWARN) ?
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"enabled" : "mask through VDDOK");
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dev_info(&stw481x->client->dev, "VMMC: %s\n",
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(val & STW_CONF2_VMMC_EXT) ? "internal" : "external");
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dev_info(&stw481x->client->dev, "IT WAKE UP: %s\n",
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(val & STW_CONF2_MASK_IT_WAKE_UP) ? "enabled" : "masked");
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dev_info(&stw481x->client->dev, "GPO1: %s\n",
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(val & STW_CONF2_GPO1) ? "low" : "high impedance");
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dev_info(&stw481x->client->dev, "GPO2: %s\n",
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(val & STW_CONF2_GPO2) ? "low" : "high impedance");
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ret = regmap_read(stw481x->map, STW_VCORE_SLEEP, &val);
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if (ret)
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return ret;
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vcore_slp = val & 0x0f;
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dev_info(&stw481x->client->dev, "VCORE SLEEP: %u.%uV\n",
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vcore_val[vcore_slp] / 100, vcore_val[vcore_slp] % 100);
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return 0;
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}
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/*
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* MFD cells - we have one cell which is selected operation
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* mode, and we always have a GPIO cell.
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*/
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static struct mfd_cell stw481x_cells[] = {
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{
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.of_compatible = "st,stw481x-vmmc",
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.name = "stw481x-vmmc-regulator",
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.id = -1,
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},
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};
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static const struct regmap_config stw481x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int stw481x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct stw481x *stw481x;
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int ret;
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int i;
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stw481x = devm_kzalloc(&client->dev, sizeof(*stw481x), GFP_KERNEL);
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if (!stw481x)
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return -ENOMEM;
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i2c_set_clientdata(client, stw481x);
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stw481x->client = client;
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stw481x->map = devm_regmap_init_i2c(client, &stw481x_regmap_config);
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if (IS_ERR(stw481x->map)) {
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ret = PTR_ERR(stw481x->map);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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ret = stw481x_startup(stw481x);
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if (ret) {
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dev_err(&client->dev, "chip initialization failed\n");
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return ret;
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}
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/* Set up and register the platform devices. */
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for (i = 0; i < ARRAY_SIZE(stw481x_cells); i++) {
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/* One state holder for all drivers, this is simple */
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stw481x_cells[i].platform_data = stw481x;
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stw481x_cells[i].pdata_size = sizeof(*stw481x);
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}
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ret = mfd_add_devices(&client->dev, 0, stw481x_cells,
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ARRAY_SIZE(stw481x_cells), NULL, 0, NULL);
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if (ret)
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return ret;
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dev_info(&client->dev, "initialized STw481x device\n");
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return ret;
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}
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static int stw481x_remove(struct i2c_client *client)
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{
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mfd_remove_devices(&client->dev);
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return 0;
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}
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/*
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* This ID table is completely unused, as this is a pure
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* device-tree probed driver, but it has to be here due to
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* the structure of the I2C core.
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*/
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static const struct i2c_device_id stw481x_id[] = {
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{ "stw481x", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, stw481x_id);
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static const struct of_device_id stw481x_match[] = {
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{ .compatible = "st,stw4810", },
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{ .compatible = "st,stw4811", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, stw481x_match);
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static struct i2c_driver stw481x_driver = {
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.driver = {
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.name = "stw481x",
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.of_match_table = stw481x_match,
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},
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.probe = stw481x_probe,
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.remove = stw481x_remove,
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.id_table = stw481x_id,
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};
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module_i2c_driver(stw481x_driver);
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MODULE_AUTHOR("Linus Walleij");
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MODULE_DESCRIPTION("STw481x PMIC driver");
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MODULE_LICENSE("GPL v2");
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