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Date: Fri, 31 Jul 2015 11:12:56 +0800
From: Jisheng Zhang <jszhang@...vell.com>
To: Antoine Tenart <antoine.tenart@...e-electrons.com>
CC: <sebastian.hesselbarth@...il.com>, <thierry.reding@...il.com>,
<zmxu@...vell.com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-pwm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/5] pwm: add the Berlin pwm controller driver
Hi,
On Thu, 30 Jul 2015 11:23:17 +0200
Antoine Tenart <antoine.tenart@...e-electrons.com> wrote:
> Add a PWM controller driver for the Marvell Berlin SoCs. This PWM
> controller has 4 channels.
>
> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
> ---
> drivers/pwm/Kconfig | 9 +++
> drivers/pwm/Makefile | 1 +
> drivers/pwm/pwm-berlin.c | 207 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 217 insertions(+)
> create mode 100644 drivers/pwm/pwm-berlin.c
>
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index b1541f40fd8d..1773da8145b8 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -92,6 +92,15 @@ config PWM_BCM2835
> To compile this driver as a module, choose M here: the module
> will be called pwm-bcm2835.
>
> +config PWM_BERLIN
> + tristate "Berlin PWM support"
> + depends on ARCH_BERLIN
> + help
> + PWM framework driver for Berlin.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called pwm-berlin.
> +
> config PWM_BFIN
> tristate "Blackfin PWM support"
> depends on BFIN_GPTIMERS
> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
> index ec50eb5b5a8f..670c5fce8bbb 100644
> --- a/drivers/pwm/Makefile
> +++ b/drivers/pwm/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM) += pwm-atmel-hlcdc.o
> obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o
> obj-$(CONFIG_PWM_BCM_KONA) += pwm-bcm-kona.o
> obj-$(CONFIG_PWM_BCM2835) += pwm-bcm2835.o
> +obj-$(CONFIG_PWM_BERLIN) += pwm-berlin.o
> obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
> obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
> obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
> diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c
> new file mode 100644
> index 000000000000..786990c1c750
> --- /dev/null
> +++ b/drivers/pwm/pwm-berlin.c
> @@ -0,0 +1,207 @@
> +/*
> + * Marvell Berlin PWM driver
> + *
> + * Copyright (C) 2015 Marvell Technology Group Ltd.
> + *
> + * Antoine Tenart <antoine.tenart@...e-electrons.com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/pwm.h>
> +#include <linux/spinlock.h>
> +
> +#define BERLIN_PWM_EN 0x0
> +#define BERLIN_PWM_CONTROL 0x4
> +#define BERLIN_PWM_DUTY 0x8
> +#define BERLIN_PWM_TCNT 0xc
> +
> +#define BERLIN_PWM_CLK_RATE 100000000
All PWMs in SoC use cfgclk as clock source, this is missed in BSP we provided
to you. So We could get clk rate rather than hardcoding as this. And we need to
clk_prepare_enable cfgclk in proper point.
> +#define BERLIN_PWM_PRESCALE_MASK 0x7
> +#define BERLIN_PWM_PRESCALE_MAX 4096
> +
> +struct berlin_pwm_chip {
> + struct pwm_chip chip;
> + void __iomem *base;
> + spinlock_t lock;
> +};
> +
> +#define to_berlin_pwm_chip(chip) \
> + container_of((chip), struct berlin_pwm_chip, chip)
> +
> +#define berlin_pwm_readl(chip, channel, offset) \
> + readl((chip)->base + (channel) * 0x10 + offset)
could we use relaxed version?
> +#define berlin_pwm_writel(val, chip, channel, offset) \
> + writel(val, (chip)->base + (channel) * 0x10 + offset)
ditto
> +
> +static const u32 prescaler_table[] = {
> + 1,
> + 4,
> + 8,
> + 16,
> + 64,
> + 256,
> + 1024,
> + 4096,
> +};
> +
> +static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
> + int duty_ns, int period_ns)
> +{
> + struct berlin_pwm_chip *berlin_chip = to_berlin_pwm_chip(chip);
> + int prescale;
> + u32 val, duty, period;
> + u64 tmp;
> +
> + for (prescale = 0; prescale < ARRAY_SIZE(prescaler_table); prescale++) {
> + tmp = BERLIN_PWM_CLK_RATE;
> + do_div(tmp, prescaler_table[prescale]);
> + tmp *= period_ns;
> + do_div(tmp, NSEC_PER_SEC);
> +
> + if (tmp - 1 <= BERLIN_PWM_PRESCALE_MAX)
> + break;
> + }
> +
> + if (tmp - 1 > BERLIN_PWM_PRESCALE_MAX)
> + return -EINVAL;
> +
> + period = tmp;
> + tmp *= duty_ns;
> + do_div(tmp, period_ns);
> + duty = tmp;
> +
> + spin_lock(&berlin_chip->lock);
Any reason to take spinlock?
> +
> + val = berlin_pwm_readl(berlin_chip, pwm->hwpwm, BERLIN_PWM_CONTROL);
> + val &= ~BERLIN_PWM_PRESCALE_MASK;
> + val |= prescale;
> + berlin_pwm_writel(val, berlin_chip, pwm->hwpwm, BERLIN_PWM_CONTROL);
> +
> + berlin_pwm_writel(duty, berlin_chip, pwm->hwpwm, BERLIN_PWM_DUTY);
> + berlin_pwm_writel(period, berlin_chip, pwm->hwpwm, BERLIN_PWM_TCNT);
> +
> + spin_unlock(&berlin_chip->lock);
> +
> + return 0;
> +}
> +
> +static int berlin_pwm_set_polarity(struct pwm_chip *chip,
> + struct pwm_device *pwm,
> + enum pwm_polarity polarity)
> +{
> + struct berlin_pwm_chip *berlin_chip = to_berlin_pwm_chip(chip);
> + u32 val;
> +
> + spin_lock(&berlin_chip->lock);
> +
> + val = berlin_pwm_readl(berlin_chip, pwm->hwpwm, BERLIN_PWM_CONTROL);
> +
> + if (polarity == PWM_POLARITY_NORMAL)
> + val &= ~BIT(3);
> + else
> + val |= BIT(3);
> +
> + berlin_pwm_writel(val, berlin_chip, pwm->hwpwm, BERLIN_PWM_CONTROL);
> +
> + spin_unlock(&berlin_chip->lock);
> +
> + return 0;
> +}
> +
> +static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + struct berlin_pwm_chip *berlin_chip = to_berlin_pwm_chip(chip);
> +
> + spin_lock(&berlin_chip->lock);
> + berlin_pwm_writel(0x1, berlin_chip, pwm->hwpwm, BERLIN_PWM_EN);
> + spin_unlock(&berlin_chip->lock);
> +
> + return 0;
> +}
> +
> +static void berlin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + struct berlin_pwm_chip *berlin_chip = to_berlin_pwm_chip(chip);
> +
> + spin_lock(&berlin_chip->lock);
> + berlin_pwm_writel(0x0, berlin_chip, pwm->hwpwm, BERLIN_PWM_EN);
> + spin_unlock(&berlin_chip->lock);
> +}
> +
> +static const struct pwm_ops berlin_pwm_ops = {
> + .config = berlin_pwm_config,
> + .set_polarity = berlin_pwm_set_polarity,
> + .enable = berlin_pwm_enable,
> + .disable = berlin_pwm_disable,
> + .owner = THIS_MODULE,
> +};
> +
> +static const struct of_device_id berlin_pwm_match[] = {
> + { .compatible = "marvell,berlin-pwm" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, berlin_pwm_match);
> +
> +static int berlin_pwm_probe(struct platform_device *pdev)
> +{
> + struct berlin_pwm_chip *pwm;
> + struct resource *res;
> + int ret;
> +
> + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
> + if (!pwm)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + pwm->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(pwm->base))
> + return PTR_ERR(pwm->base);
> +
> + pwm->chip.dev = &pdev->dev;
> + pwm->chip.ops = &berlin_pwm_ops;
> + pwm->chip.base = -1;
> + pwm->chip.npwm = 4;
> + pwm->chip.can_sleep = true;
> + pwm->chip.of_xlate = of_pwm_xlate_with_flags;
> + pwm->chip.of_pwm_n_cells = 3;
> +
> + spin_lock_init(&pwm->lock);
> +
> + ret = pwmchip_add(&pwm->chip);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to add PWM chip: %d\n", ret);
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, pwm);
> +
> + return 0;
> +}
> +
> +static int berlin_pwm_remove(struct platform_device *pdev)
> +{
> + struct berlin_pwm_chip *pwm = platform_get_drvdata(pdev);
> +
> + return pwmchip_remove(&pwm->chip);
> +}
> +
> +static struct platform_driver berlin_pwm_driver = {
> + .probe = berlin_pwm_probe,
> + .remove = berlin_pwm_remove,
> + .driver = {
> + .name = "berlin-pwm",
> + .of_match_table = berlin_pwm_match,
> + },
> +};
> +module_platform_driver(berlin_pwm_driver);
> +
> +MODULE_AUTHOR("Antoine Tenart <antoine.tenart@...e-electrons.com>");
> +MODULE_DESCRIPTION("Marvell Berlin PWM driver");
> +MODULE_LICENSE("GPL v2");
--
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