diff options
Diffstat (limited to 'drivers/regulator/tps6236x-regulator.c')
| -rw-r--r-- | drivers/regulator/tps6236x-regulator.c | 521 |
1 files changed, 521 insertions, 0 deletions
diff --git a/drivers/regulator/tps6236x-regulator.c b/drivers/regulator/tps6236x-regulator.c new file mode 100644 index 000000000000..1928b30c8802 --- /dev/null +++ b/drivers/regulator/tps6236x-regulator.c @@ -0,0 +1,521 @@ +/* + * driver/regultor/tps6236x.c + * + * Driver for processor core supply tps62360 and tps62361B + * + * Copyright (c) 2011, NVIDIA Corporation. + * + * 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 version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, + * whether express or implied; 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 + */ + +/*#define DEBUG 1*/ +/*#define VERBOSE_DEBUG 1*/ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/tps6236x-regulator.h> +#include <linux/i2c.h> +#include <linux/delay.h> +#include <linux/slab.h> + +/* Register definitions */ +#define REG_VSET0 0 +#define REG_VSET1 1 +#define REG_VSET2 2 +#define REG_VSET3 3 +#define REG_CONTROL 4 +#define REG_TEMP 5 +#define REG_RAMPCTRL 6 +#define REG_CHIPID 8 + +enum chips {TPS62360, TPS62361B}; + +/* Supported voltage values for regulators */ +static const u16 TPS62360_VOLTAGES[] = { + 770, 780, 790, 800, 810, 820, 830, 840, 850, 860, + 870, 880, 890, 900, 910, 920, 930, 940, 950, 960, + 970, 980, 990, 1000, 1010, 1020, 1030, 1040, 1050, 1060, + 1070, 1080, 1090, 1110, 1110, 1120, 1130, 1140, 1150, 1160, + 1170, 1180, 1190, 1200, 1210, 1220, 1230, 1240, 1250, 1260, + 1270, 1280, 1290, 1300, 1310, 1320, 1330, 1340, 1350, 1360, + 1370, 1380, 1390, 1400, +}; + +static const u16 TPS62361_VOLTAGES[] = { + 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, + 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, + 700, 710, 720, 730, 740, 750, 760, 770, 780, 790, + 800, 810, 820, 830, 840, 850, 860, 870, 880, 890, + 900, 910, 920, 930, 940, 950, 960, 970, 980, 990, + 1000, 1010, 1020, 1030, 1040, 1050, 1060, 1070, 1080, 1090, + 1110, 1110, 1120, 1130, 1140, 1150, 1160, 1170, 1180, 1190, + 1200, 1210, 1220, 1230, 1240, 1250, 1260, 1270, 1280, 1290, + 1300, 1310, 1320, 1330, 1340, 1350, 1360, 1370, 1380, 1390, + 1400, 1410, 1420, 1430, 1440, 1450, 1460, 1470, 1480, 1490, + 1500, 1510, 1520, 1530, 1540, 1550, 1560, 1570, 1580, 1590, + 1600, 1610, 1620, 1630, 1640, 1650, 1660, 1670, 1680, 1690, + 1700, 1710, 1720, 1730, 1740, 1750, 1760, 1770, +}; + +/* tps 6236x chip information */ +struct tps6236x_chip { + const char *name; + struct device *dev; + struct regulator_desc desc; + struct i2c_client *client; + struct regulator_dev *rdev; + struct mutex io_lock; + int chip_id; + unsigned int curr_uV; + int vsel_id; + int internal_pulldn_en; + const u16 *voltages; + u8 voltage_reg_mask; + bool is_force_pwm; + bool enable_discharge; +}; +static inline int tps6236x_read(struct tps6236x_chip *tps, u8 reg) +{ + return i2c_smbus_read_byte_data(tps->client, reg); +} + +static inline int tps6236x_write(struct tps6236x_chip *tps, u8 reg, u8 val) +{ + return i2c_smbus_write_byte_data(tps->client, reg, val); +} + +static int tps6236x_reg_read(struct tps6236x_chip *tps, u8 reg) +{ + int data; + + mutex_lock(&tps->io_lock); + + data = tps6236x_read(tps, reg); + if (data < 0) + dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); + + mutex_unlock(&tps->io_lock); + + return data; +} + +static int tps6236x_reg_write(struct tps6236x_chip *tps, u8 reg, u8 val) +{ + int err; + + mutex_lock(&tps->io_lock); + + err = tps6236x_write(tps, reg, val); + if (err < 0) + dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); + + mutex_unlock(&tps->io_lock); + + return err; +} + +static int tps6236x_reg_update(struct tps6236x_chip *tps, u8 reg, u8 val, + u8 mask) +{ + int err; + int data; + u8 reg_val; + + mutex_lock(&tps->io_lock); + data = tps6236x_read(tps, reg); + if (data < 0) { + dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); + err = data; + goto out; + } + reg_val = (u8)data; + reg_val = (reg_val & ~mask) | (val & mask); + + err = tps6236x_write(tps, reg, reg_val); + if (err < 0) + dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); + +out: + mutex_unlock(&tps->io_lock); + return err; +} + +static int __tps6236x_dcdc_set_voltage(struct tps6236x_chip *tps, + int min_uV, int max_uV, + unsigned *selector) +{ + int vsel; + + if (max_uV < min_uV) + return -EINVAL; + + if (min_uV > tps->voltages[tps->desc.n_voltages - 1] * 1000) + return -EINVAL; + + if (max_uV < tps->voltages[0] * 1000) + return -EINVAL; + + for (vsel = 0; vsel < tps->desc.n_voltages; ++vsel) { + int mV = tps->voltages[vsel]; + int uV = mV * 1000; + if (min_uV <= uV && uV <= max_uV) { + if (selector) + *selector = vsel; + if (tps->is_force_pwm) + vsel |= (1 << 7); + return tps6236x_reg_write(tps, REG_VSET0 + tps->vsel_id, + vsel); + } + } + return -EINVAL; +} + +static int tps6236x_dcdc_is_enabled(struct regulator_dev *dev) +{ + /* Always return 1 as the EN is not controlled by register + programming */ + return 1; +} + +static int tps6236x_dcdc_enable(struct regulator_dev *dev) +{ + /* No way to enable dc-dc converter through register programming */ + return 0; + +} + +static int tps6236x_dcdc_disable(struct regulator_dev *dev) +{ + /* No way to disable dc-dc converter through register programming */ + return 0; +} + +static int tps6236x_dcdc_get_voltage(struct regulator_dev *dev) +{ + struct tps6236x_chip *tps = rdev_get_drvdata(dev); + int data; + + data = tps6236x_reg_read(tps, REG_VSET0 + tps->vsel_id); + if (data < 0) + return data; + data &= tps->voltage_reg_mask; + + return tps->voltages[data] * 1000; +} + +static int tps6236x_dcdc_set_voltage(struct regulator_dev *dev, + int min_uV, int max_uV, + unsigned *selector) +{ + struct tps6236x_chip *tps = rdev_get_drvdata(dev); + + return __tps6236x_dcdc_set_voltage(tps, min_uV, max_uV, selector); +} + +static int tps6236x_dcdc_list_voltage(struct regulator_dev *dev, + unsigned selector) +{ + struct tps6236x_chip *tps = rdev_get_drvdata(dev); + + if ((selector < 0) || (selector >= tps->desc.n_voltages)) + return -EINVAL; + + return tps->voltages[selector] * 1000; +} + +/* Operations permitted on VDCDCx */ +static struct regulator_ops tps6236x_dcdc_ops = { + .is_enabled = tps6236x_dcdc_is_enabled, + .enable = tps6236x_dcdc_enable, + .disable = tps6236x_dcdc_disable, + .get_voltage = tps6236x_dcdc_get_voltage, + .set_voltage = tps6236x_dcdc_set_voltage, + .list_voltage = tps6236x_dcdc_list_voltage, +}; + +#ifdef CONFIG_DEBUG_FS +#include <linux/debugfs.h> +#include <linux/seq_file.h> +static void print_regs(const char *header, struct seq_file *s, + struct tps6236x_chip *tps, int start_offset, + int end_offset) +{ + int reg_val; + int i; + + seq_printf(s, "%s\n", header); + for (i = start_offset; i <= end_offset; ++i) { + reg_val = tps6236x_reg_read(tps, i); + if (reg_val >= 0) + seq_printf(s, "Reg 0x%02x Value 0x%02x\n", i, reg_val); + } + seq_printf(s, "------------------\n"); +} + +static int dbg_tps_show(struct seq_file *s, void *unused) +{ + struct tps6236x_chip *tps = s->private; + + seq_printf(s, "TPS6236x Registers\n"); + seq_printf(s, "------------------\n"); + + print_regs("Voltage Regs", s, tps, 0x0, 0x3); + print_regs("Config Regs", s, tps, 0x4, 0x6); + print_regs("ManId Regs", s, tps, 0x8, 0x9); + return 0; +} + +static int dbg_tps_open(struct inode *inode, struct file *file) +{ + return single_open(file, dbg_tps_show, inode->i_private); +} + +static const struct file_operations debug_fops = { + .open = dbg_tps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void __init tps6236x_debuginit(struct tps6236x_chip *tps) +{ + (void)debugfs_create_file("tps6236x", S_IRUGO, NULL, + tps, &debug_fops); +} +#else +static void __init tps6236x_debuginit(struct tps6236x_chip *tps) +{ + return; +} +#endif +static int tps6236x_init_dcdc(struct i2c_client *client, + struct tps6236x_regulator_platform_data *pdata, + struct tps6236x_chip *tps) +{ + int st; + int init_mV; + int data; + + if (pdata->internal_pd_enable) + st = tps6236x_write(tps, REG_CONTROL, 0xE0); + else + st = tps6236x_write(tps, REG_CONTROL, 0x0); + if (st < 0) { + dev_err(tps->dev, "%s() fails in writing reg %d\n", + __func__, REG_CONTROL); + return st; + } + + data = tps6236x_reg_read(tps, REG_VSET0 + tps->vsel_id); + if (data < 0) { + dev_err(tps->dev, "%s() fails in reading reg %d\n", + __func__, REG_VSET0 + tps->vsel_id); + return data; + } + if (pdata->is_force_pwm) + data |= (1 << 7); + else + data &= ~(1 << 7); + st = tps6236x_reg_write(tps, REG_VSET0 + tps->vsel_id, data); + if (st < 0) { + dev_err(tps->dev, "%s() fails in writing reg %d\n", + __func__, REG_VSET0 + tps->vsel_id); + return st; + } + + /* Reset output discharge path */ + st = tps6236x_reg_update(tps, REG_RAMPCTRL, 0, 1 << 2); + if (st < 0) { + dev_err(tps->dev, "%s() fails in updating reg %d\n", + __func__, REG_RAMPCTRL); + return st; + } + + if (!pdata->init_apply) + return 0; + + init_mV = pdata->init_uV; + return __tps6236x_dcdc_set_voltage(tps, init_mV, init_mV, 0); +} + +static int __devinit tps6236x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tps6236x_regulator_platform_data *pdata; + struct regulator_init_data *init_data; + struct regulator_dev *rdev; + struct tps6236x_chip *tps; + int err; + int chip_id; + int part_id; + + dev_dbg(&client->dev, "%s() is called\n", __func__); + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&client->dev, "Err: The I2c functionality is" + " not supported\n"); + return -EIO; + } + + /** + * init_data points to array of regulator_init structures + * coming from the board-evm file. + */ + pdata = client->dev.platform_data; + if (!pdata) { + dev_err(&client->dev, "Err: Platform data not found\n"); + return -EIO; + } + + init_data = &pdata->reg_init_data; + tps = kzalloc(sizeof(*tps), GFP_KERNEL); + if (!tps) { + dev_err(&client->dev, "Err: Memory allocation fails\n"); + return -ENOMEM; + } + + mutex_init(&tps->io_lock); + + tps->is_force_pwm = pdata->is_force_pwm; + tps->enable_discharge = pdata->enable_discharge; + tps->chip_id = id->driver_data; + tps->client = client; + tps->dev = &client->dev; + tps->internal_pulldn_en = pdata->internal_pd_enable; + tps->vsel_id = pdata->vsel; + tps->name = id->name; + tps->voltages = (tps->chip_id == TPS62360) ? + TPS62360_VOLTAGES : TPS62361_VOLTAGES; + tps->voltage_reg_mask = (tps->chip_id == TPS62360) ? 0x3F : 0x7F; + + tps->desc.name = id->name; + tps->desc.id = 0; + tps->desc.n_voltages = (tps->chip_id == TPS62360) ? + ARRAY_SIZE(TPS62360_VOLTAGES) : + ARRAY_SIZE(TPS62361_VOLTAGES); + tps->desc.ops = &tps6236x_dcdc_ops; + tps->desc.type = REGULATOR_VOLTAGE; + tps->desc.owner = THIS_MODULE; + + i2c_set_clientdata(client, tps); + + /* Read version number and compare with chipid */ + chip_id = tps6236x_read(tps, REG_CHIPID); + if (chip_id < 0) { + err = chip_id; + dev_err(tps->dev, "Error in reading device %d\n", err); + goto fail; + } + part_id = (chip_id >> 2) & 0x3; + if (((part_id == 0) && (tps->chip_id != TPS62360)) || + ((part_id == 1) && (tps->chip_id != TPS62361B)) || + (part_id == 2) || (part_id == 3)) { + dev_err(tps->dev, "Err: Mismatch of partid and driver chip-id" + " 0x%x\n", chip_id); + err = -ENODEV; + goto fail; + } + + err = tps6236x_init_dcdc(client, pdata, tps); + if (err < 0) { + dev_err(tps->dev, "TPS6236X init fails with = %d\n", err); + goto fail; + } + + /* Register the regulators */ + rdev = regulator_register(&tps->desc, &client->dev, init_data, tps); + if (IS_ERR(rdev)) { + dev_err(tps->dev, "Failed to register %s\n", id->name); + err = PTR_ERR(rdev); + goto fail; + } + + tps->rdev = rdev; + + tps6236x_debuginit(tps); + return 0; + +fail: + kfree(tps); + return err; +} + +/** + * tps6236x_remove - tps6236x driver i2c remove handler + * @client: i2c driver client device structure + * + * Unregister TPS driver as an i2c client device driver + */ +static int __devexit tps6236x_remove(struct i2c_client *client) +{ + struct tps6236x_chip *tps = i2c_get_clientdata(client); + + regulator_unregister(tps->rdev); + kfree(tps); + return 0; +} + +static void tps6236x_shutdown(struct i2c_client *client) +{ + struct tps6236x_chip *tps = i2c_get_clientdata(client); + int st; + + if (!tps->enable_discharge) + return; + + /* Configure the output discharge path */ + st = tps6236x_reg_update(tps, REG_RAMPCTRL, (1 << 2), (1 << 2)); + if (st < 0) + dev_err(tps->dev, "%s() fails in updating reg %d\n", + __func__, REG_RAMPCTRL); +} + +static const struct i2c_device_id tps6236x_id[] = { + {.name = "tps62360", .driver_data = TPS62360}, + {.name = "tps62361B", .driver_data = TPS62361B}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, tps6236x_id); + +static struct i2c_driver tps6236x_i2c_driver = { + .driver = { + .name = "tps6236x", + .owner = THIS_MODULE, + }, + .probe = tps6236x_probe, + .remove = __devexit_p(tps6236x_remove), + .shutdown = tps6236x_shutdown, + .id_table = tps6236x_id, +}; + +/* Module init function */ +static int __init tps6236x_init(void) +{ + return i2c_add_driver(&tps6236x_i2c_driver); +} +subsys_initcall_sync(tps6236x_init); + +/* Module exit function */ +static void __exit tps6236x_cleanup(void) +{ + i2c_del_driver(&tps6236x_i2c_driver); +} +module_exit(tps6236x_cleanup); |