diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/pwm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-bcm-iproc.c | 277 |
3 files changed, 288 insertions, 0 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index c182efc62c7b..d298ebdd872d 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -74,6 +74,16 @@ config PWM_ATMEL_TCB To compile this driver as a module, choose M here: the module will be called pwm-atmel-tcb. +config PWM_BCM_IPROC + tristate "iProc PWM support" + depends on ARCH_BCM_IPROC + help + Generic PWM framework driver for Broadcom iProc PWM block. This + block is used in Broadcom iProc SoC's. + + To compile this driver as a module, choose M here: the module + will be called pwm-bcm-iproc. + config PWM_BCM_KONA tristate "Kona PWM support" depends on ARCH_BCM_MOBILE diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index dd35bc121a18..a196d79fbd3f 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o obj-$(CONFIG_PWM_ATMEL) += pwm-atmel.o obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM) += pwm-atmel-hlcdc.o obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o +obj-$(CONFIG_PWM_BCM_IPROC) += pwm-bcm-iproc.o obj-$(CONFIG_PWM_BCM_KONA) += pwm-bcm-kona.o obj-$(CONFIG_PWM_BCM2835) += pwm-bcm2835.o obj-$(CONFIG_PWM_BERLIN) += pwm-berlin.o diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c new file mode 100644 index 000000000000..d961a8207b1c --- /dev/null +++ b/drivers/pwm/pwm-bcm-iproc.c @@ -0,0 +1,277 @@ +/* + * Copyright (C) 2016 Broadcom + * + * 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. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/math64.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pwm.h> + +#define IPROC_PWM_CTRL_OFFSET 0x00 +#define IPROC_PWM_CTRL_TYPE_SHIFT(ch) (15 + (ch)) +#define IPROC_PWM_CTRL_POLARITY_SHIFT(ch) (8 + (ch)) +#define IPROC_PWM_CTRL_EN_SHIFT(ch) (ch) + +#define IPROC_PWM_PERIOD_OFFSET(ch) (0x04 + ((ch) << 3)) +#define IPROC_PWM_PERIOD_MIN 0x02 +#define IPROC_PWM_PERIOD_MAX 0xffff + +#define IPROC_PWM_DUTY_CYCLE_OFFSET(ch) (0x08 + ((ch) << 3)) +#define IPROC_PWM_DUTY_CYCLE_MIN 0x00 +#define IPROC_PWM_DUTY_CYCLE_MAX 0xffff + +#define IPROC_PWM_PRESCALE_OFFSET 0x24 +#define IPROC_PWM_PRESCALE_BITS 0x06 +#define IPROC_PWM_PRESCALE_SHIFT(ch) ((3 - (ch)) * \ + IPROC_PWM_PRESCALE_BITS) +#define IPROC_PWM_PRESCALE_MASK(ch) (IPROC_PWM_PRESCALE_MAX << \ + IPROC_PWM_PRESCALE_SHIFT(ch)) +#define IPROC_PWM_PRESCALE_MIN 0x00 +#define IPROC_PWM_PRESCALE_MAX 0x3f + +struct iproc_pwmc { + struct pwm_chip chip; + void __iomem *base; + struct clk *clk; +}; + +static inline struct iproc_pwmc *to_iproc_pwmc(struct pwm_chip *chip) +{ + return container_of(chip, struct iproc_pwmc, chip); +} + +static void iproc_pwmc_enable(struct iproc_pwmc *ip, unsigned int channel) +{ + u32 value; + + value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); + value |= 1 << IPROC_PWM_CTRL_EN_SHIFT(channel); + writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); + + /* must be a 400 ns delay between clearing and setting enable bit */ + ndelay(400); +} + +static void iproc_pwmc_disable(struct iproc_pwmc *ip, unsigned int channel) +{ + u32 value; + + value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); + value &= ~(1 << IPROC_PWM_CTRL_EN_SHIFT(channel)); + writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); + + /* must be a 400 ns delay between clearing and setting enable bit */ + ndelay(400); +} + +static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct iproc_pwmc *ip = to_iproc_pwmc(chip); + u64 tmp, multi, rate; + u32 value, prescale; + + rate = clk_get_rate(ip->clk); + + value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); + + if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm))) + state->enabled = true; + else + state->enabled = false; + + if (value & BIT(IPROC_PWM_CTRL_POLARITY_SHIFT(pwm->hwpwm))) + state->polarity = PWM_POLARITY_NORMAL; + else + state->polarity = PWM_POLARITY_INVERSED; + + value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET); + prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm); + prescale &= IPROC_PWM_PRESCALE_MAX; + + multi = NSEC_PER_SEC * (prescale + 1); + + value = readl(ip->base + IPROC_PWM_PERIOD_OFFSET(pwm->hwpwm)); + tmp = (value & IPROC_PWM_PERIOD_MAX) * multi; + state->period = div64_u64(tmp, rate); + + value = readl(ip->base + IPROC_PWM_DUTY_CYCLE_OFFSET(pwm->hwpwm)); + tmp = (value & IPROC_PWM_PERIOD_MAX) * multi; + state->duty_cycle = div64_u64(tmp, rate); +} + +static int iproc_pwmc_apply(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + unsigned long prescale = IPROC_PWM_PRESCALE_MIN; + struct iproc_pwmc *ip = to_iproc_pwmc(chip); + u32 value, period, duty; + u64 rate; + + rate = clk_get_rate(ip->clk); + + /* + * Find period count, duty count and prescale to suit duty_cycle and + * period. This is done according to formulas described below: + * + * period_ns = 10^9 * (PRESCALE + 1) * PC / PWM_CLK_RATE + * duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE + * + * PC = (PWM_CLK_RATE * period_ns) / (10^9 * (PRESCALE + 1)) + * DC = (PWM_CLK_RATE * duty_ns) / (10^9 * (PRESCALE + 1)) + */ + while (1) { + u64 value, div; + + div = NSEC_PER_SEC * (prescale + 1); + value = rate * state->period; + period = div64_u64(value, div); + value = rate * state->duty_cycle; + duty = div64_u64(value, div); + + if (period < IPROC_PWM_PERIOD_MIN || + duty < IPROC_PWM_DUTY_CYCLE_MIN) + return -EINVAL; + + if (period <= IPROC_PWM_PERIOD_MAX && + duty <= IPROC_PWM_DUTY_CYCLE_MAX) + break; + + /* Otherwise, increase prescale and recalculate counts */ + if (++prescale > IPROC_PWM_PRESCALE_MAX) + return -EINVAL; + } + + iproc_pwmc_disable(ip, pwm->hwpwm); + + /* Set prescale */ + value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET); + value &= ~IPROC_PWM_PRESCALE_MASK(pwm->hwpwm); + value |= prescale << IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm); + writel(value, ip->base + IPROC_PWM_PRESCALE_OFFSET); + + /* set period and duty cycle */ + writel(period, ip->base + IPROC_PWM_PERIOD_OFFSET(pwm->hwpwm)); + writel(duty, ip->base + IPROC_PWM_DUTY_CYCLE_OFFSET(pwm->hwpwm)); + + /* set polarity */ + value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); + + if (state->polarity == PWM_POLARITY_NORMAL) + value |= 1 << IPROC_PWM_CTRL_POLARITY_SHIFT(pwm->hwpwm); + else + value &= ~(1 << IPROC_PWM_CTRL_POLARITY_SHIFT(pwm->hwpwm)); + + writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); + + if (state->enabled) + iproc_pwmc_enable(ip, pwm->hwpwm); + + return 0; +} + +static const struct pwm_ops iproc_pwm_ops = { + .apply = iproc_pwmc_apply, + .get_state = iproc_pwmc_get_state, +}; + +static int iproc_pwmc_probe(struct platform_device *pdev) +{ + struct iproc_pwmc *ip; + struct resource *res; + unsigned int i; + u32 value; + int ret; + + ip = devm_kzalloc(&pdev->dev, sizeof(*ip), GFP_KERNEL); + if (!ip) + return -ENOMEM; + + platform_set_drvdata(pdev, ip); + + ip->chip.dev = &pdev->dev; + ip->chip.ops = &iproc_pwm_ops; + ip->chip.base = -1; + ip->chip.npwm = 4; + ip->chip.of_xlate = of_pwm_xlate_with_flags; + ip->chip.of_pwm_n_cells = 3; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ip->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ip->base)) + return PTR_ERR(ip->base); + + ip->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(ip->clk)) { + dev_err(&pdev->dev, "failed to get clock: %ld\n", + PTR_ERR(ip->clk)); + return PTR_ERR(ip->clk); + } + + ret = clk_prepare_enable(ip->clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to enable clock: %d\n", ret); + return ret; + } + + /* Set full drive and normal polarity for all channels */ + value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); + + for (i = 0; i < ip->chip.npwm; i++) { + value &= ~(1 << IPROC_PWM_CTRL_TYPE_SHIFT(i)); + value |= 1 << IPROC_PWM_CTRL_POLARITY_SHIFT(i); + } + + writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); + + ret = pwmchip_add(&ip->chip); + if (ret < 0) { + dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret); + clk_disable_unprepare(ip->clk); + } + + return ret; +} + +static int iproc_pwmc_remove(struct platform_device *pdev) +{ + struct iproc_pwmc *ip = platform_get_drvdata(pdev); + + clk_disable_unprepare(ip->clk); + + return pwmchip_remove(&ip->chip); +} + +static const struct of_device_id bcm_iproc_pwmc_dt[] = { + { .compatible = "brcm,iproc-pwm" }, + { }, +}; +MODULE_DEVICE_TABLE(of, bcm_iproc_pwmc_dt); + +static struct platform_driver iproc_pwmc_driver = { + .driver = { + .name = "bcm-iproc-pwm", + .of_match_table = bcm_iproc_pwmc_dt, + }, + .probe = iproc_pwmc_probe, + .remove = iproc_pwmc_remove, +}; +module_platform_driver(iproc_pwmc_driver); + +MODULE_AUTHOR("Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>"); +MODULE_DESCRIPTION("Broadcom iProc PWM driver"); +MODULE_LICENSE("GPL v2"); |