Release 4.8 drivers/pwm/pwm-tiecap.c

/*
 * ECAP PWM driver
 *
 * Copyright (C) 2012 Texas Instruments, Inc. - http://www.ti.com/
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/pwm.h>
#include <linux/of_device.h>

/* ECAP registers and bits definitions */

#define CAP1			0x08

#define CAP2			0x0C

#define CAP3			0x10

#define CAP4			0x14

#define ECCTL2			0x2A

#define ECCTL2_APWM_POL_LOW	BIT(10)

#define ECCTL2_APWM_MODE	BIT(9)

#define ECCTL2_SYNC_SEL_DISA	(BIT(7) | BIT(6))

#define ECCTL2_TSCTR_FREERUN	BIT(4)


struct ecap_context {
	
u32	cap3;
	
u32	cap4;
	
u16	ecctl2;
};


struct ecap_pwm_chip {
	
struct pwm_chip	chip;
	
unsigned int	clk_rate;
	
void __iomem	*mmio_base;
	
struct ecap_context ctx;
};



static inline struct ecap_pwm_chip *to_ecap_pwm_chip(struct pwm_chip *chip)
{
	return container_of(chip, struct ecap_pwm_chip, chip);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%

/*
 * period_ns = 10^9 * period_cycles / PWM_CLK_RATE
 * duty_ns   = 10^9 * duty_cycles / PWM_CLK_RATE
 */


static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
		int duty_ns, int period_ns)
{
	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
	unsigned long long c;
	unsigned long period_cycles, duty_cycles;
	unsigned int reg_val;

	if (period_ns > NSEC_PER_SEC)
		return -ERANGE;

	c = pc->clk_rate;
	c = c * period_ns;
	do_div(c, NSEC_PER_SEC);
	period_cycles = (unsigned long)c;

	if (period_cycles < 1) {
		period_cycles = 1;
		duty_cycles = 1;
	} else {
		c = pc->clk_rate;
		c = c * duty_ns;
		do_div(c, NSEC_PER_SEC);
		duty_cycles = (unsigned long)c;
	}

	pm_runtime_get_sync(pc->chip.dev);

	reg_val = readw(pc->mmio_base + ECCTL2);

	/* Configure APWM mode & disable sync option */
	reg_val |= ECCTL2_APWM_MODE | ECCTL2_SYNC_SEL_DISA;

	writew(reg_val, pc->mmio_base + ECCTL2);

	if (!pwm_is_enabled(pwm)) {
		/* Update active registers if not running */
		writel(duty_cycles, pc->mmio_base + CAP2);
		writel(period_cycles, pc->mmio_base + CAP1);
	} else {
		/*
                 * Update shadow registers to configure period and
                 * compare values. This helps current PWM period to
                 * complete on reconfiguring
                 */
		writel(duty_cycles, pc->mmio_base + CAP4);
		writel(period_cycles, pc->mmio_base + CAP3);
	}

	if (!pwm_is_enabled(pwm)) {
		reg_val = readw(pc->mmio_base + ECCTL2);
		/* Disable APWM mode to put APWM output Low */
		reg_val &= ~ECCTL2_APWM_MODE;
		writew(reg_val, pc->mmio_base + ECCTL2);
	}

	pm_runtime_put_sync(pc->chip.dev);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
275
99.28%
2
66.67%
boris brezillon
boris brezillon
2
0.72%
1
33.33%
Total
277
100.00%
3
100.00%



static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
		enum pwm_polarity polarity)
{
	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
	unsigned short reg_val;

	pm_runtime_get_sync(pc->chip.dev);
	reg_val = readw(pc->mmio_base + ECCTL2);
	if (polarity == PWM_POLARITY_INVERSED)
		/* Duty cycle defines LOW period of PWM */
		reg_val |= ECCTL2_APWM_POL_LOW;
	else
		/* Duty cycle defines HIGH period of PWM */
		reg_val &= ~ECCTL2_APWM_POL_LOW;

	writew(reg_val, pc->mmio_base + ECCTL2);
	pm_runtime_put_sync(pc->chip.dev);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
95
100.00%
1
100.00%
Total
95
100.00%
1
100.00%



static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
	unsigned int reg_val;

	/* Leave clock enabled on enabling PWM */
	pm_runtime_get_sync(pc->chip.dev);

	/*
         * Enable 'Free run Time stamp counter mode' to start counter
         * and  'APWM mode' to enable APWM output
         */
	reg_val = readw(pc->mmio_base + ECCTL2);
	reg_val |= ECCTL2_TSCTR_FREERUN | ECCTL2_APWM_MODE;
	writew(reg_val, pc->mmio_base + ECCTL2);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
72
100.00%
1
100.00%
Total
72
100.00%
1
100.00%



static void ecap_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
	unsigned int reg_val;

	/*
         * Disable 'Free run Time stamp counter mode' to stop counter
         * and 'APWM mode' to put APWM output to low
         */
	reg_val = readw(pc->mmio_base + ECCTL2);
	reg_val &= ~(ECCTL2_TSCTR_FREERUN | ECCTL2_APWM_MODE);
	writew(reg_val, pc->mmio_base + ECCTL2);

	/* Disable clock on PWM disable */
	pm_runtime_put_sync(pc->chip.dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
72
100.00%
1
100.00%
Total
72
100.00%
1
100.00%



static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	if (pwm_is_enabled(pwm)) {
		dev_warn(chip->dev, "Removing PWM device without disabling\n");
		pm_runtime_put_sync(chip->dev);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
40
97.56%
1
50.00%
boris brezillon
boris brezillon
1
2.44%
1
50.00%
Total
41
100.00%
2
100.00%


static const struct pwm_ops ecap_pwm_ops = {
	.free		= ecap_pwm_free,
	.config		= ecap_pwm_config,
	.set_polarity	= ecap_pwm_set_polarity,
	.enable		= ecap_pwm_enable,
	.disable	= ecap_pwm_disable,
	.owner		= THIS_MODULE,
};


static const struct of_device_id ecap_of_match[] = {
	{ .compatible	= "ti,am3352-ecap" },
	{ .compatible	= "ti,am33xx-ecap" },
	{},
};
MODULE_DEVICE_TABLE(of, ecap_of_match);



static int ecap_pwm_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	int ret;
	struct resource *r;
	struct clk *clk;
	struct ecap_pwm_chip *pc;

	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
	if (!pc)
		return -ENOMEM;

	clk = devm_clk_get(&pdev->dev, "fck");
	if (IS_ERR(clk)) {
		if (of_device_is_compatible(np, "ti,am33xx-ecap")) {
			dev_warn(&pdev->dev, "Binding is obsolete.\n");
			clk = devm_clk_get(pdev->dev.parent, "fck");
		}
	}

	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		return PTR_ERR(clk);
	}

	pc->clk_rate = clk_get_rate(clk);
	if (!pc->clk_rate) {
		dev_err(&pdev->dev, "failed to get clock rate\n");
		return -EINVAL;
	}

	pc->chip.dev = &pdev->dev;
	pc->chip.ops = &ecap_pwm_ops;
	pc->chip.of_xlate = of_pwm_xlate_with_flags;
	pc->chip.of_pwm_n_cells = 3;
	pc->chip.base = -1;
	pc->chip.npwm = 1;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	pc->mmio_base = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(pc->mmio_base))
		return PTR_ERR(pc->mmio_base);

	ret = pwmchip_add(&pc->chip);
	if (ret < 0) {
		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
		return ret;
	}

	pm_runtime_enable(&pdev->dev);

	platform_set_drvdata(pdev, pc);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
261
80.31%
2
50.00%
franklin s cooper jr
franklin s cooper jr
54
16.62%
1
25.00%
thierry reding
thierry reding
10
3.08%
1
25.00%
Total
325
100.00%
4
100.00%



static int ecap_pwm_remove(struct platform_device *pdev)
{
	struct ecap_pwm_chip *pc = platform_get_drvdata(pdev);

	pm_runtime_disable(&pdev->dev);
	return pwmchip_remove(&pc->chip);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%

#ifdef CONFIG_PM_SLEEP


static void ecap_pwm_save_context(struct ecap_pwm_chip *pc)
{
	pm_runtime_get_sync(pc->chip.dev);
	pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
	pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
	pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
	pm_runtime_put_sync(pc->chip.dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
73
98.65%
1
50.00%
axel lin
axel lin
1
1.35%
1
50.00%
Total
74
100.00%
2
100.00%



static void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
{
	writel(pc->ctx.cap3, pc->mmio_base + CAP3);
	writel(pc->ctx.cap4, pc->mmio_base + CAP4);
	writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
55
98.21%
1
50.00%
axel lin
axel lin
1
1.79%
1
50.00%
Total
56
100.00%
2
100.00%



static int ecap_pwm_suspend(struct device *dev)
{
	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
	struct pwm_device *pwm = pc->chip.pwms;

	ecap_pwm_save_context(pc);

	/* Disable explicitly if PWM is running */
	if (pwm_is_enabled(pwm))
		pm_runtime_put_sync(dev);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
52
98.11%
1
50.00%
boris brezillon
boris brezillon
1
1.89%
1
50.00%
Total
53
100.00%
2
100.00%



static int ecap_pwm_resume(struct device *dev)
{
	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
	struct pwm_device *pwm = pc->chip.pwms;

	/* Enable explicitly if PWM was running */
	if (pwm_is_enabled(pwm))
		pm_runtime_get_sync(dev);

	ecap_pwm_restore_context(pc);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
52
98.11%
1
50.00%
boris brezillon
boris brezillon
1
1.89%
1
50.00%
Total
53
100.00%
2
100.00%

#endif

static SIMPLE_DEV_PM_OPS(ecap_pwm_pm_ops, ecap_pwm_suspend, ecap_pwm_resume);


static struct platform_driver ecap_pwm_driver = {
	.driver = {
		.name	= "ecap",
		.of_match_table = ecap_of_match,
		.pm	= &ecap_pwm_pm_ops,
        },
	.probe = ecap_pwm_probe,
	.remove = ecap_pwm_remove,
};


module_platform_driver(ecap_pwm_driver);

MODULE_DESCRIPTION("ECAP PWM driver");
MODULE_AUTHOR("Texas Instruments");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
avinash philip
avinash philip
1340
94.17%
5
45.45%
franklin s cooper jr
franklin s cooper jr
61
4.29%
1
9.09%
thierry reding
thierry reding
10
0.70%
1
9.09%
boris brezillon
boris brezillon
5
0.35%
1
9.09%
jingoo han
jingoo han
5
0.35%
2
18.18%
axel lin
axel lin
2
0.14%
1
9.09%
Total
1423
100.00%
11
100.00%
  
Directory: drivers/pwm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.