diff options
Diffstat (limited to 'drivers/pwm/pwm-ab8500.c')
| -rw-r--r-- | drivers/pwm/pwm-ab8500.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-ab8500.c b/drivers/pwm/pwm-ab8500.c new file mode 100644 index 0000000000..583a7d69c7 --- /dev/null +++ b/drivers/pwm/pwm-ab8500.c @@ -0,0 +1,228 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * Author: Arun R Murthy <arun.murthy@stericsson.com> + * Datasheet: https://web.archive.org/web/20130614115108/http://www.stericsson.com/developers/CD00291561_UM1031_AB8500_user_manual-rev5_CTDS_public.pdf + */ +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/pwm.h> +#include <linux/mfd/abx500.h> +#include <linux/mfd/abx500/ab8500.h> +#include <linux/module.h> + +/* + * PWM Out generators + * Bank: 0x10 + */ +#define AB8500_PWM_OUT_CTRL1_REG 0x60 +#define AB8500_PWM_OUT_CTRL2_REG 0x61 +#define AB8500_PWM_OUT_CTRL7_REG 0x66 + +#define AB8500_PWM_CLKRATE 9600000 + +struct ab8500_pwm_chip { + struct pwm_chip chip; + unsigned int hwid; +}; + +static struct ab8500_pwm_chip *ab8500_pwm_from_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct ab8500_pwm_chip, chip); +} + +static int ab8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + int ret; + u8 reg; + u8 higher_val, lower_val; + unsigned int duty_steps, div; + struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip); + + if (state->polarity != PWM_POLARITY_NORMAL) + return -EINVAL; + + if (state->enabled) { + /* + * A time quantum is + * q = (32 - FreqPWMOutx[3:0]) / AB8500_PWM_CLKRATE + * The period is always 1024 q, duty_cycle is between 1q and 1024q. + * + * FreqPWMOutx[3:0] | output frequency | output frequency | 1024q = period + * | (from manual) | (1 / 1024q) | = 1 / freq + * -----------------+------------------+------------------+-------------- + * b0000 | 293 Hz | 292.968750 Hz | 3413333.33 ns + * b0001 | 302 Hz | 302.419355 Hz | 3306666.66 ns + * b0010 | 312 Hz | 312.500000 Hz | 3200000 ns + * b0011 | 323 Hz | 323.275862 Hz | 3093333.33 ns + * b0100 | 334 Hz | 334.821429 Hz | 2986666.66 ns + * b0101 | 347 Hz | 347.222222 Hz | 2880000 ns + * b0110 | 360 Hz | 360.576923 Hz | 2773333.33 ns + * b0111 | 375 Hz | 375.000000 Hz | 2666666.66 ns + * b1000 | 390 Hz | 390.625000 Hz | 2560000 ns + * b1001 | 407 Hz | 407.608696 Hz | 2453333.33 ns + * b1010 | 426 Hz | 426.136364 Hz | 2346666.66 ns + * b1011 | 446 Hz | 446.428571 Hz | 2240000 ns + * b1100 | 468 Hz | 468.750000 Hz | 2133333.33 ns + * b1101 | 493 Hz | 493.421053 Hz | 2026666.66 ns + * b1110 | 520 Hz | 520.833333 Hz | 1920000 ns + * b1111 | 551 Hz | 551.470588 Hz | 1813333.33 ns + * + * + * AB8500_PWM_CLKRATE is a multiple of 1024, so the division by + * 1024 can be done in this factor without loss of precision. + */ + div = min_t(u64, mul_u64_u64_div_u64(state->period, + AB8500_PWM_CLKRATE >> 10, + NSEC_PER_SEC), 32); /* 32 - FreqPWMOutx[3:0] */ + if (div <= 16) + /* requested period < 3413333.33 */ + return -EINVAL; + + duty_steps = max_t(u64, mul_u64_u64_div_u64(state->duty_cycle, + AB8500_PWM_CLKRATE, + (u64)NSEC_PER_SEC * div), 1024); + } + + /* + * The hardware doesn't support duty_steps = 0 explicitly, but emits low + * when disabled. + */ + if (!state->enabled || duty_steps == 0) { + ret = abx500_mask_and_set_register_interruptible(chip->dev, + AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, + 1 << ab8500->hwid, 0); + + if (ret < 0) + dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n", + pwm->label, ret); + return ret; + } + + /* + * The lower 8 bits of duty_steps is written to ... + * AB8500_PWM_OUT_CTRL1_REG[0:7] + */ + lower_val = (duty_steps - 1) & 0x00ff; + /* + * The two remaining high bits to + * AB8500_PWM_OUT_CTRL2_REG[0:1]; together with FreqPWMOutx. + */ + higher_val = ((duty_steps - 1) & 0x0300) >> 8 | (32 - div) << 4; + + reg = AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2); + + ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, + reg, lower_val); + if (ret < 0) + return ret; + + ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, + (reg + 1), higher_val); + if (ret < 0) + return ret; + + /* enable */ + ret = abx500_mask_and_set_register_interruptible(chip->dev, + AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, + 1 << ab8500->hwid, 1 << ab8500->hwid); + if (ret < 0) + dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n", + pwm->label, ret); + + return ret; +} + +static int ab8500_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + u8 ctrl7, lower_val, higher_val; + int ret; + struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip); + unsigned int div, duty_steps; + + ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC, + AB8500_PWM_OUT_CTRL7_REG, + &ctrl7); + if (ret) + return ret; + + state->polarity = PWM_POLARITY_NORMAL; + + if (!(ctrl7 & 1 << ab8500->hwid)) { + state->enabled = false; + return 0; + } + + ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC, + AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2), + &lower_val); + if (ret) + return ret; + + ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC, + AB8500_PWM_OUT_CTRL2_REG + (ab8500->hwid * 2), + &higher_val); + if (ret) + return ret; + + div = 32 - ((higher_val & 0xf0) >> 4); + duty_steps = ((higher_val & 3) << 8 | lower_val) + 1; + + state->period = DIV64_U64_ROUND_UP((u64)div << 10, AB8500_PWM_CLKRATE); + state->duty_cycle = DIV64_U64_ROUND_UP((u64)div * duty_steps, AB8500_PWM_CLKRATE); + + return 0; +} + +static const struct pwm_ops ab8500_pwm_ops = { + .apply = ab8500_pwm_apply, + .get_state = ab8500_pwm_get_state, + .owner = THIS_MODULE, +}; + +static int ab8500_pwm_probe(struct platform_device *pdev) +{ + struct ab8500_pwm_chip *ab8500; + int err; + + if (pdev->id < 1 || pdev->id > 31) + return dev_err_probe(&pdev->dev, -EINVAL, "Invalid device id %d\n", pdev->id); + + /* + * Nothing to be done in probe, this is required to get the + * device which is required for ab8500 read and write + */ + ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL); + if (ab8500 == NULL) + return -ENOMEM; + + ab8500->chip.dev = &pdev->dev; + ab8500->chip.ops = &ab8500_pwm_ops; + ab8500->chip.npwm = 1; + ab8500->hwid = pdev->id - 1; + + err = devm_pwmchip_add(&pdev->dev, &ab8500->chip); + if (err < 0) + return dev_err_probe(&pdev->dev, err, "Failed to add pwm chip\n"); + + dev_dbg(&pdev->dev, "pwm probe successful\n"); + + return 0; +} + +static struct platform_driver ab8500_pwm_driver = { + .driver = { + .name = "ab8500-pwm", + }, + .probe = ab8500_pwm_probe, +}; +module_platform_driver(ab8500_pwm_driver); + +MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>"); +MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver"); +MODULE_ALIAS("platform:ab8500-pwm"); +MODULE_LICENSE("GPL v2"); |