1daa5abc4SYendapally Reddy Dhananjaya Reddy /* 2daa5abc4SYendapally Reddy Dhananjaya Reddy * Copyright (C) 2016 Broadcom 3daa5abc4SYendapally Reddy Dhananjaya Reddy * 4daa5abc4SYendapally Reddy Dhananjaya Reddy * This program is free software; you can redistribute it and/or 5daa5abc4SYendapally Reddy Dhananjaya Reddy * modify it under the terms of the GNU General Public License as 6daa5abc4SYendapally Reddy Dhananjaya Reddy * published by the Free Software Foundation version 2. 7daa5abc4SYendapally Reddy Dhananjaya Reddy * 8daa5abc4SYendapally Reddy Dhananjaya Reddy * This program is distributed "as is" WITHOUT ANY WARRANTY of any 9daa5abc4SYendapally Reddy Dhananjaya Reddy * kind, whether express or implied; without even the implied warranty 10daa5abc4SYendapally Reddy Dhananjaya Reddy * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11daa5abc4SYendapally Reddy Dhananjaya Reddy * GNU General Public License for more details. 12daa5abc4SYendapally Reddy Dhananjaya Reddy */ 13daa5abc4SYendapally Reddy Dhananjaya Reddy 14daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/clk.h> 15daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/delay.h> 16daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/err.h> 17daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/io.h> 18daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/math64.h> 19daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/module.h> 20daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/of.h> 21daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/platform_device.h> 22daa5abc4SYendapally Reddy Dhananjaya Reddy #include <linux/pwm.h> 23daa5abc4SYendapally Reddy Dhananjaya Reddy 24daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_CTRL_OFFSET 0x00 25daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_CTRL_TYPE_SHIFT(ch) (15 + (ch)) 26daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_CTRL_POLARITY_SHIFT(ch) (8 + (ch)) 27daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_CTRL_EN_SHIFT(ch) (ch) 28daa5abc4SYendapally Reddy Dhananjaya Reddy 29daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PERIOD_OFFSET(ch) (0x04 + ((ch) << 3)) 30daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PERIOD_MIN 0x02 31daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PERIOD_MAX 0xffff 32daa5abc4SYendapally Reddy Dhananjaya Reddy 33daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_DUTY_CYCLE_OFFSET(ch) (0x08 + ((ch) << 3)) 34daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_DUTY_CYCLE_MIN 0x00 35daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_DUTY_CYCLE_MAX 0xffff 36daa5abc4SYendapally Reddy Dhananjaya Reddy 37daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PRESCALE_OFFSET 0x24 38daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PRESCALE_BITS 0x06 39daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PRESCALE_SHIFT(ch) ((3 - (ch)) * \ 40daa5abc4SYendapally Reddy Dhananjaya Reddy IPROC_PWM_PRESCALE_BITS) 41daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PRESCALE_MASK(ch) (IPROC_PWM_PRESCALE_MAX << \ 42daa5abc4SYendapally Reddy Dhananjaya Reddy IPROC_PWM_PRESCALE_SHIFT(ch)) 43daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PRESCALE_MIN 0x00 44daa5abc4SYendapally Reddy Dhananjaya Reddy #define IPROC_PWM_PRESCALE_MAX 0x3f 45daa5abc4SYendapally Reddy Dhananjaya Reddy 46daa5abc4SYendapally Reddy Dhananjaya Reddy struct iproc_pwmc { 47daa5abc4SYendapally Reddy Dhananjaya Reddy struct pwm_chip chip; 48daa5abc4SYendapally Reddy Dhananjaya Reddy void __iomem *base; 49daa5abc4SYendapally Reddy Dhananjaya Reddy struct clk *clk; 50daa5abc4SYendapally Reddy Dhananjaya Reddy }; 51daa5abc4SYendapally Reddy Dhananjaya Reddy 52daa5abc4SYendapally Reddy Dhananjaya Reddy static inline struct iproc_pwmc *to_iproc_pwmc(struct pwm_chip *chip) 53daa5abc4SYendapally Reddy Dhananjaya Reddy { 54daa5abc4SYendapally Reddy Dhananjaya Reddy return container_of(chip, struct iproc_pwmc, chip); 55daa5abc4SYendapally Reddy Dhananjaya Reddy } 56daa5abc4SYendapally Reddy Dhananjaya Reddy 57daa5abc4SYendapally Reddy Dhananjaya Reddy static void iproc_pwmc_enable(struct iproc_pwmc *ip, unsigned int channel) 58daa5abc4SYendapally Reddy Dhananjaya Reddy { 59daa5abc4SYendapally Reddy Dhananjaya Reddy u32 value; 60daa5abc4SYendapally Reddy Dhananjaya Reddy 61daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); 62daa5abc4SYendapally Reddy Dhananjaya Reddy value |= 1 << IPROC_PWM_CTRL_EN_SHIFT(channel); 63daa5abc4SYendapally Reddy Dhananjaya Reddy writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); 64daa5abc4SYendapally Reddy Dhananjaya Reddy 65daa5abc4SYendapally Reddy Dhananjaya Reddy /* must be a 400 ns delay between clearing and setting enable bit */ 66daa5abc4SYendapally Reddy Dhananjaya Reddy ndelay(400); 67daa5abc4SYendapally Reddy Dhananjaya Reddy } 68daa5abc4SYendapally Reddy Dhananjaya Reddy 69daa5abc4SYendapally Reddy Dhananjaya Reddy static void iproc_pwmc_disable(struct iproc_pwmc *ip, unsigned int channel) 70daa5abc4SYendapally Reddy Dhananjaya Reddy { 71daa5abc4SYendapally Reddy Dhananjaya Reddy u32 value; 72daa5abc4SYendapally Reddy Dhananjaya Reddy 73daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); 74daa5abc4SYendapally Reddy Dhananjaya Reddy value &= ~(1 << IPROC_PWM_CTRL_EN_SHIFT(channel)); 75daa5abc4SYendapally Reddy Dhananjaya Reddy writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); 76daa5abc4SYendapally Reddy Dhananjaya Reddy 77daa5abc4SYendapally Reddy Dhananjaya Reddy /* must be a 400 ns delay between clearing and setting enable bit */ 78daa5abc4SYendapally Reddy Dhananjaya Reddy ndelay(400); 79daa5abc4SYendapally Reddy Dhananjaya Reddy } 80daa5abc4SYendapally Reddy Dhananjaya Reddy 81daa5abc4SYendapally Reddy Dhananjaya Reddy static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, 82daa5abc4SYendapally Reddy Dhananjaya Reddy struct pwm_state *state) 83daa5abc4SYendapally Reddy Dhananjaya Reddy { 84daa5abc4SYendapally Reddy Dhananjaya Reddy struct iproc_pwmc *ip = to_iproc_pwmc(chip); 85daa5abc4SYendapally Reddy Dhananjaya Reddy u64 tmp, multi, rate; 86daa5abc4SYendapally Reddy Dhananjaya Reddy u32 value, prescale; 87daa5abc4SYendapally Reddy Dhananjaya Reddy 88daa5abc4SYendapally Reddy Dhananjaya Reddy rate = clk_get_rate(ip->clk); 89daa5abc4SYendapally Reddy Dhananjaya Reddy 90daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); 91daa5abc4SYendapally Reddy Dhananjaya Reddy 92daa5abc4SYendapally Reddy Dhananjaya Reddy if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm))) 93daa5abc4SYendapally Reddy Dhananjaya Reddy state->enabled = true; 94daa5abc4SYendapally Reddy Dhananjaya Reddy else 95daa5abc4SYendapally Reddy Dhananjaya Reddy state->enabled = false; 96daa5abc4SYendapally Reddy Dhananjaya Reddy 97daa5abc4SYendapally Reddy Dhananjaya Reddy if (value & BIT(IPROC_PWM_CTRL_POLARITY_SHIFT(pwm->hwpwm))) 98daa5abc4SYendapally Reddy Dhananjaya Reddy state->polarity = PWM_POLARITY_NORMAL; 99daa5abc4SYendapally Reddy Dhananjaya Reddy else 100daa5abc4SYendapally Reddy Dhananjaya Reddy state->polarity = PWM_POLARITY_INVERSED; 101daa5abc4SYendapally Reddy Dhananjaya Reddy 102daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET); 103daa5abc4SYendapally Reddy Dhananjaya Reddy prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm); 104daa5abc4SYendapally Reddy Dhananjaya Reddy prescale &= IPROC_PWM_PRESCALE_MAX; 105daa5abc4SYendapally Reddy Dhananjaya Reddy 106daa5abc4SYendapally Reddy Dhananjaya Reddy multi = NSEC_PER_SEC * (prescale + 1); 107daa5abc4SYendapally Reddy Dhananjaya Reddy 108daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_PERIOD_OFFSET(pwm->hwpwm)); 109daa5abc4SYendapally Reddy Dhananjaya Reddy tmp = (value & IPROC_PWM_PERIOD_MAX) * multi; 110daa5abc4SYendapally Reddy Dhananjaya Reddy state->period = div64_u64(tmp, rate); 111daa5abc4SYendapally Reddy Dhananjaya Reddy 112daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_DUTY_CYCLE_OFFSET(pwm->hwpwm)); 113daa5abc4SYendapally Reddy Dhananjaya Reddy tmp = (value & IPROC_PWM_PERIOD_MAX) * multi; 114daa5abc4SYendapally Reddy Dhananjaya Reddy state->duty_cycle = div64_u64(tmp, rate); 115daa5abc4SYendapally Reddy Dhananjaya Reddy } 116daa5abc4SYendapally Reddy Dhananjaya Reddy 117daa5abc4SYendapally Reddy Dhananjaya Reddy static int iproc_pwmc_apply(struct pwm_chip *chip, struct pwm_device *pwm, 118daa5abc4SYendapally Reddy Dhananjaya Reddy struct pwm_state *state) 119daa5abc4SYendapally Reddy Dhananjaya Reddy { 120daa5abc4SYendapally Reddy Dhananjaya Reddy unsigned long prescale = IPROC_PWM_PRESCALE_MIN; 121daa5abc4SYendapally Reddy Dhananjaya Reddy struct iproc_pwmc *ip = to_iproc_pwmc(chip); 122daa5abc4SYendapally Reddy Dhananjaya Reddy u32 value, period, duty; 123daa5abc4SYendapally Reddy Dhananjaya Reddy u64 rate; 124daa5abc4SYendapally Reddy Dhananjaya Reddy 125daa5abc4SYendapally Reddy Dhananjaya Reddy rate = clk_get_rate(ip->clk); 126daa5abc4SYendapally Reddy Dhananjaya Reddy 127daa5abc4SYendapally Reddy Dhananjaya Reddy /* 128daa5abc4SYendapally Reddy Dhananjaya Reddy * Find period count, duty count and prescale to suit duty_cycle and 129daa5abc4SYendapally Reddy Dhananjaya Reddy * period. This is done according to formulas described below: 130daa5abc4SYendapally Reddy Dhananjaya Reddy * 131daa5abc4SYendapally Reddy Dhananjaya Reddy * period_ns = 10^9 * (PRESCALE + 1) * PC / PWM_CLK_RATE 132daa5abc4SYendapally Reddy Dhananjaya Reddy * duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE 133daa5abc4SYendapally Reddy Dhananjaya Reddy * 134daa5abc4SYendapally Reddy Dhananjaya Reddy * PC = (PWM_CLK_RATE * period_ns) / (10^9 * (PRESCALE + 1)) 135daa5abc4SYendapally Reddy Dhananjaya Reddy * DC = (PWM_CLK_RATE * duty_ns) / (10^9 * (PRESCALE + 1)) 136daa5abc4SYendapally Reddy Dhananjaya Reddy */ 137daa5abc4SYendapally Reddy Dhananjaya Reddy while (1) { 138daa5abc4SYendapally Reddy Dhananjaya Reddy u64 value, div; 139daa5abc4SYendapally Reddy Dhananjaya Reddy 140daa5abc4SYendapally Reddy Dhananjaya Reddy div = NSEC_PER_SEC * (prescale + 1); 141daa5abc4SYendapally Reddy Dhananjaya Reddy value = rate * state->period; 142daa5abc4SYendapally Reddy Dhananjaya Reddy period = div64_u64(value, div); 143daa5abc4SYendapally Reddy Dhananjaya Reddy value = rate * state->duty_cycle; 144daa5abc4SYendapally Reddy Dhananjaya Reddy duty = div64_u64(value, div); 145daa5abc4SYendapally Reddy Dhananjaya Reddy 146daa5abc4SYendapally Reddy Dhananjaya Reddy if (period < IPROC_PWM_PERIOD_MIN || 147daa5abc4SYendapally Reddy Dhananjaya Reddy duty < IPROC_PWM_DUTY_CYCLE_MIN) 148daa5abc4SYendapally Reddy Dhananjaya Reddy return -EINVAL; 149daa5abc4SYendapally Reddy Dhananjaya Reddy 150daa5abc4SYendapally Reddy Dhananjaya Reddy if (period <= IPROC_PWM_PERIOD_MAX && 151daa5abc4SYendapally Reddy Dhananjaya Reddy duty <= IPROC_PWM_DUTY_CYCLE_MAX) 152daa5abc4SYendapally Reddy Dhananjaya Reddy break; 153daa5abc4SYendapally Reddy Dhananjaya Reddy 154daa5abc4SYendapally Reddy Dhananjaya Reddy /* Otherwise, increase prescale and recalculate counts */ 155daa5abc4SYendapally Reddy Dhananjaya Reddy if (++prescale > IPROC_PWM_PRESCALE_MAX) 156daa5abc4SYendapally Reddy Dhananjaya Reddy return -EINVAL; 157daa5abc4SYendapally Reddy Dhananjaya Reddy } 158daa5abc4SYendapally Reddy Dhananjaya Reddy 159daa5abc4SYendapally Reddy Dhananjaya Reddy iproc_pwmc_disable(ip, pwm->hwpwm); 160daa5abc4SYendapally Reddy Dhananjaya Reddy 161daa5abc4SYendapally Reddy Dhananjaya Reddy /* Set prescale */ 162daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET); 163daa5abc4SYendapally Reddy Dhananjaya Reddy value &= ~IPROC_PWM_PRESCALE_MASK(pwm->hwpwm); 164daa5abc4SYendapally Reddy Dhananjaya Reddy value |= prescale << IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm); 165daa5abc4SYendapally Reddy Dhananjaya Reddy writel(value, ip->base + IPROC_PWM_PRESCALE_OFFSET); 166daa5abc4SYendapally Reddy Dhananjaya Reddy 167daa5abc4SYendapally Reddy Dhananjaya Reddy /* set period and duty cycle */ 168daa5abc4SYendapally Reddy Dhananjaya Reddy writel(period, ip->base + IPROC_PWM_PERIOD_OFFSET(pwm->hwpwm)); 169daa5abc4SYendapally Reddy Dhananjaya Reddy writel(duty, ip->base + IPROC_PWM_DUTY_CYCLE_OFFSET(pwm->hwpwm)); 170daa5abc4SYendapally Reddy Dhananjaya Reddy 171daa5abc4SYendapally Reddy Dhananjaya Reddy /* set polarity */ 172daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); 173daa5abc4SYendapally Reddy Dhananjaya Reddy 174daa5abc4SYendapally Reddy Dhananjaya Reddy if (state->polarity == PWM_POLARITY_NORMAL) 175daa5abc4SYendapally Reddy Dhananjaya Reddy value |= 1 << IPROC_PWM_CTRL_POLARITY_SHIFT(pwm->hwpwm); 176daa5abc4SYendapally Reddy Dhananjaya Reddy else 177daa5abc4SYendapally Reddy Dhananjaya Reddy value &= ~(1 << IPROC_PWM_CTRL_POLARITY_SHIFT(pwm->hwpwm)); 178daa5abc4SYendapally Reddy Dhananjaya Reddy 179daa5abc4SYendapally Reddy Dhananjaya Reddy writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); 180daa5abc4SYendapally Reddy Dhananjaya Reddy 181daa5abc4SYendapally Reddy Dhananjaya Reddy if (state->enabled) 182daa5abc4SYendapally Reddy Dhananjaya Reddy iproc_pwmc_enable(ip, pwm->hwpwm); 183daa5abc4SYendapally Reddy Dhananjaya Reddy 184daa5abc4SYendapally Reddy Dhananjaya Reddy return 0; 185daa5abc4SYendapally Reddy Dhananjaya Reddy } 186daa5abc4SYendapally Reddy Dhananjaya Reddy 187daa5abc4SYendapally Reddy Dhananjaya Reddy static const struct pwm_ops iproc_pwm_ops = { 188daa5abc4SYendapally Reddy Dhananjaya Reddy .apply = iproc_pwmc_apply, 189daa5abc4SYendapally Reddy Dhananjaya Reddy .get_state = iproc_pwmc_get_state, 190daa5abc4SYendapally Reddy Dhananjaya Reddy }; 191daa5abc4SYendapally Reddy Dhananjaya Reddy 192daa5abc4SYendapally Reddy Dhananjaya Reddy static int iproc_pwmc_probe(struct platform_device *pdev) 193daa5abc4SYendapally Reddy Dhananjaya Reddy { 194daa5abc4SYendapally Reddy Dhananjaya Reddy struct iproc_pwmc *ip; 195daa5abc4SYendapally Reddy Dhananjaya Reddy struct resource *res; 196daa5abc4SYendapally Reddy Dhananjaya Reddy unsigned int i; 197daa5abc4SYendapally Reddy Dhananjaya Reddy u32 value; 198daa5abc4SYendapally Reddy Dhananjaya Reddy int ret; 199daa5abc4SYendapally Reddy Dhananjaya Reddy 200daa5abc4SYendapally Reddy Dhananjaya Reddy ip = devm_kzalloc(&pdev->dev, sizeof(*ip), GFP_KERNEL); 201daa5abc4SYendapally Reddy Dhananjaya Reddy if (!ip) 202daa5abc4SYendapally Reddy Dhananjaya Reddy return -ENOMEM; 203daa5abc4SYendapally Reddy Dhananjaya Reddy 204daa5abc4SYendapally Reddy Dhananjaya Reddy platform_set_drvdata(pdev, ip); 205daa5abc4SYendapally Reddy Dhananjaya Reddy 206daa5abc4SYendapally Reddy Dhananjaya Reddy ip->chip.dev = &pdev->dev; 207daa5abc4SYendapally Reddy Dhananjaya Reddy ip->chip.ops = &iproc_pwm_ops; 208daa5abc4SYendapally Reddy Dhananjaya Reddy ip->chip.base = -1; 209daa5abc4SYendapally Reddy Dhananjaya Reddy ip->chip.npwm = 4; 210daa5abc4SYendapally Reddy Dhananjaya Reddy ip->chip.of_xlate = of_pwm_xlate_with_flags; 211daa5abc4SYendapally Reddy Dhananjaya Reddy ip->chip.of_pwm_n_cells = 3; 212daa5abc4SYendapally Reddy Dhananjaya Reddy 213daa5abc4SYendapally Reddy Dhananjaya Reddy res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 214daa5abc4SYendapally Reddy Dhananjaya Reddy ip->base = devm_ioremap_resource(&pdev->dev, res); 215daa5abc4SYendapally Reddy Dhananjaya Reddy if (IS_ERR(ip->base)) 216daa5abc4SYendapally Reddy Dhananjaya Reddy return PTR_ERR(ip->base); 217daa5abc4SYendapally Reddy Dhananjaya Reddy 218daa5abc4SYendapally Reddy Dhananjaya Reddy ip->clk = devm_clk_get(&pdev->dev, NULL); 219daa5abc4SYendapally Reddy Dhananjaya Reddy if (IS_ERR(ip->clk)) { 220daa5abc4SYendapally Reddy Dhananjaya Reddy dev_err(&pdev->dev, "failed to get clock: %ld\n", 221daa5abc4SYendapally Reddy Dhananjaya Reddy PTR_ERR(ip->clk)); 222daa5abc4SYendapally Reddy Dhananjaya Reddy return PTR_ERR(ip->clk); 223daa5abc4SYendapally Reddy Dhananjaya Reddy } 224daa5abc4SYendapally Reddy Dhananjaya Reddy 225daa5abc4SYendapally Reddy Dhananjaya Reddy ret = clk_prepare_enable(ip->clk); 226daa5abc4SYendapally Reddy Dhananjaya Reddy if (ret < 0) { 227daa5abc4SYendapally Reddy Dhananjaya Reddy dev_err(&pdev->dev, "failed to enable clock: %d\n", ret); 228daa5abc4SYendapally Reddy Dhananjaya Reddy return ret; 229daa5abc4SYendapally Reddy Dhananjaya Reddy } 230daa5abc4SYendapally Reddy Dhananjaya Reddy 231daa5abc4SYendapally Reddy Dhananjaya Reddy /* Set full drive and normal polarity for all channels */ 232daa5abc4SYendapally Reddy Dhananjaya Reddy value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); 233daa5abc4SYendapally Reddy Dhananjaya Reddy 234daa5abc4SYendapally Reddy Dhananjaya Reddy for (i = 0; i < ip->chip.npwm; i++) { 235daa5abc4SYendapally Reddy Dhananjaya Reddy value &= ~(1 << IPROC_PWM_CTRL_TYPE_SHIFT(i)); 236daa5abc4SYendapally Reddy Dhananjaya Reddy value |= 1 << IPROC_PWM_CTRL_POLARITY_SHIFT(i); 237daa5abc4SYendapally Reddy Dhananjaya Reddy } 238daa5abc4SYendapally Reddy Dhananjaya Reddy 239daa5abc4SYendapally Reddy Dhananjaya Reddy writel(value, ip->base + IPROC_PWM_CTRL_OFFSET); 240daa5abc4SYendapally Reddy Dhananjaya Reddy 241daa5abc4SYendapally Reddy Dhananjaya Reddy ret = pwmchip_add(&ip->chip); 242daa5abc4SYendapally Reddy Dhananjaya Reddy if (ret < 0) { 243daa5abc4SYendapally Reddy Dhananjaya Reddy dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret); 244daa5abc4SYendapally Reddy Dhananjaya Reddy clk_disable_unprepare(ip->clk); 245daa5abc4SYendapally Reddy Dhananjaya Reddy } 246daa5abc4SYendapally Reddy Dhananjaya Reddy 247daa5abc4SYendapally Reddy Dhananjaya Reddy return ret; 248daa5abc4SYendapally Reddy Dhananjaya Reddy } 249daa5abc4SYendapally Reddy Dhananjaya Reddy 250daa5abc4SYendapally Reddy Dhananjaya Reddy static int iproc_pwmc_remove(struct platform_device *pdev) 251daa5abc4SYendapally Reddy Dhananjaya Reddy { 252daa5abc4SYendapally Reddy Dhananjaya Reddy struct iproc_pwmc *ip = platform_get_drvdata(pdev); 253daa5abc4SYendapally Reddy Dhananjaya Reddy 254daa5abc4SYendapally Reddy Dhananjaya Reddy clk_disable_unprepare(ip->clk); 255daa5abc4SYendapally Reddy Dhananjaya Reddy 256daa5abc4SYendapally Reddy Dhananjaya Reddy return pwmchip_remove(&ip->chip); 257daa5abc4SYendapally Reddy Dhananjaya Reddy } 258daa5abc4SYendapally Reddy Dhananjaya Reddy 259daa5abc4SYendapally Reddy Dhananjaya Reddy static const struct of_device_id bcm_iproc_pwmc_dt[] = { 260daa5abc4SYendapally Reddy Dhananjaya Reddy { .compatible = "brcm,iproc-pwm" }, 261daa5abc4SYendapally Reddy Dhananjaya Reddy { }, 262daa5abc4SYendapally Reddy Dhananjaya Reddy }; 263daa5abc4SYendapally Reddy Dhananjaya Reddy MODULE_DEVICE_TABLE(of, bcm_iproc_pwmc_dt); 264daa5abc4SYendapally Reddy Dhananjaya Reddy 265daa5abc4SYendapally Reddy Dhananjaya Reddy static struct platform_driver iproc_pwmc_driver = { 266daa5abc4SYendapally Reddy Dhananjaya Reddy .driver = { 267daa5abc4SYendapally Reddy Dhananjaya Reddy .name = "bcm-iproc-pwm", 268daa5abc4SYendapally Reddy Dhananjaya Reddy .of_match_table = bcm_iproc_pwmc_dt, 269daa5abc4SYendapally Reddy Dhananjaya Reddy }, 270daa5abc4SYendapally Reddy Dhananjaya Reddy .probe = iproc_pwmc_probe, 271daa5abc4SYendapally Reddy Dhananjaya Reddy .remove = iproc_pwmc_remove, 272daa5abc4SYendapally Reddy Dhananjaya Reddy }; 273daa5abc4SYendapally Reddy Dhananjaya Reddy module_platform_driver(iproc_pwmc_driver); 274daa5abc4SYendapally Reddy Dhananjaya Reddy 275daa5abc4SYendapally Reddy Dhananjaya Reddy MODULE_AUTHOR("Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>"); 276daa5abc4SYendapally Reddy Dhananjaya Reddy MODULE_DESCRIPTION("Broadcom iProc PWM driver"); 277daa5abc4SYendapally Reddy Dhananjaya Reddy MODULE_LICENSE("GPL v2"); 278