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Message-ID: <8bc21686-86e3-4296-34cc-9913edfd22eb@microchip.com>
Date: Fri, 15 Dec 2017 11:30:32 +0200
From: Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To: hao_zhang <hao5781286@...il.com>, <thierry.reding@...il.com>,
<robh+dt@...nel.org>, <mark.rutland@....com>,
<linux@...linux.org.uk>, <wens@...e.org>,
<linus.walleij@...aro.org>, <maxime.ripard@...e-electrons.com>
CC: <devicetree@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-amlogic@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 2/4] ARM: PWM: add allwinner sun8i R40/V40/T3 pwm
support.
On 14.12.2017 12:44, Claudiu Beznea wrote:
>
>
> On 13.12.2017 16:44, hao_zhang wrote:
>> This patch add allwinner sun8i R40/V40/T3 pwm support.
>>
>> Signed-off-by: hao_zhang <hao5781286@...il.com>
>> ---
>> drivers/pwm/Kconfig | 10 +
>> drivers/pwm/Makefile | 1 +
>> drivers/pwm/pwm-sun8i-r40.c | 449 ++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 460 insertions(+)
>> create mode 100644 drivers/pwm/pwm-sun8i-r40.c
>>
>> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
>> index 763ee50..cde5a70 100644
>> --- a/drivers/pwm/Kconfig
>> +++ b/drivers/pwm/Kconfig
>> @@ -444,6 +444,16 @@ config PWM_SUN4I
>> To compile this driver as a module, choose M here: the module
>> will be called pwm-sun4i.
>>
>> +config PWM_SUN8I_R40
>> + tristate "Allwinner PWM SUN8I R40 support"
>> + depends on ARCH_SUNXI || COMPILE_TEST
>> + depends on HAS_IOMEM && COMMON_CLK
>> + help
>> + Generic PWM framework driver for Allwinner SoCs R40, V40, T3.
>> +
>> + To compile this driver as a module, choose M here: the module
>> + will be called pwm-sun8i-r40.
>> +
>> config PWM_TEGRA
>> tristate "NVIDIA Tegra PWM support"
>> depends on ARCH_TEGRA
>> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
>> index 0258a74..026a55b 100644
>> --- a/drivers/pwm/Makefile
>> +++ b/drivers/pwm/Makefile
>> @@ -44,6 +44,7 @@ obj-$(CONFIG_PWM_STM32) += pwm-stm32.o
>> obj-$(CONFIG_PWM_STM32_LP) += pwm-stm32-lp.o
>> obj-$(CONFIG_PWM_STMPE) += pwm-stmpe.o
>> obj-$(CONFIG_PWM_SUN4I) += pwm-sun4i.o
>> +obj-$(CONFIG_PWM_SUN8I_R40) += pwm-sun8i-r40.o
>> obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
>> obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o
>> obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o
>> diff --git a/drivers/pwm/pwm-sun8i-r40.c b/drivers/pwm/pwm-sun8i-r40.c
>> new file mode 100644
>> index 0000000..8df538d
>> --- /dev/null
>> +++ b/drivers/pwm/pwm-sun8i-r40.c
>> @@ -0,0 +1,449 @@
>> +#include <linux/bitops.h>
>> +#include <linux/clk.h>
>> +#include <linux/delay.h>
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pwm.h>
>> +#include <linux/slab.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/time.h>
>> +
>> +#define PWM_IRQ_ENABLE_REG 0x0000
>> +#define PCIE(ch) BIT(ch)
>> +
>> +#define PWM_IRQ_STATUS_REG 0x0004
>> +#define PIS(ch) BIT(ch)
>> +
>> +#define CAPTURE_IRQ_ENABLE_REG 0x0010
>> +#define CFIE(ch) BIT(ch << 1 + 1)
>> +#define CRIE(ch) BIT(ch << 1)
>> +
>> +#define CAPTURE_IRQ_STATUS_REG 0x0014
>> +#define CFIS(ch) BIT(ch << 1 + 1)
>> +#define CRIS(ch) BIT(ch << 1)
>> +
>> +#define CLK_CFG_REG(ch) (0x0020 + (ch >> 1) * 4)
>> +#define CLK_SRC BIT(7)
>> +#define CLK_SRC_BYPASS_SEC BIT(6)
>> +#define CLK_SRC_BYPASS_FIR BIT(5)
>> +#define CLK_GATING BIT(4)
>> +#define CLK_DIV_M GENMASK(3, 0)
>> +
>> +#define PWM_DZ_CTR_REG(ch) (0x0030 + (ch >> 1) * 4)
>> +#define PWM_DZ_INTV GENMASK(15, 8)
>> +#define PWM_DZ_EN BIT(0)
>> +
>> +#define PWM_ENABLE_REG 0x0040
>> +#define PWM_EN(ch) BIT(ch)
>> +
>> +#define CAPTURE_ENABLE_REG 0x0044
>> +#define CAP_EN(ch) BIT(ch)
>> +
>> +#define PWM_CTR_REG(ch) (0x0060 + ch * 0x20)
>> +#define PWM_PERIOD_RDY BIT(11)
>> +#define PWM_PUL_START BIT(10)
>> +#define PWM_MODE BIT(9)
>> +#define PWM_ACT_STA BIT(8)
>> +#define PWM_PRESCAL_K GENMASK(7, 0)
>> +
>> +#define PWM_PERIOD_REG(ch) (0x0064 + ch * 0x20)
>> +#define PWM_ENTIRE_CYCLE GENMASK(31, 16)
>> +#define PWM_ACT_CYCLE GENMASK(15, 0)
>> +
>> +#define PWM_CNT_REG(ch) (0x0068 + ch * 0x20)
>> +#define PWM_CNT_VAL GENMASK(15, 0)
>> +
>> +#define CAPTURE_CTR_REG(ch) (0x006c + ch * 0x20)
>> +#define CAPTURE_CRLF BIT(2)
>> +#define CAPTURE_CFLF BIT(1)
>> +#define CAPINV BIT(0)
>> +
>> +#define CAPTURE_RISE_REG(ch) (0x0070 + ch * 0x20)
>> +#define CAPTURE_CRLR GENMASK(15, 0)
>> +
>> +#define CAPTURE_FALL_REG(ch) (0x0074 + ch * 0x20)
>> +#define CAPTURE_CFLR GENMASK(15, 0)
>> +
>> +struct sunxi_pwm_data {
>> + bool has_prescaler_bypass;
>> + bool has_rdy;
>> + unsigned int npwm;
>> +};
>> +
>> +struct sunxi_pwm_chip {
>> + struct pwm_chip chip;
>> + struct clk *clk;
>> + void __iomem *base;
>> + spinlock_t ctrl_lock;
>> + const struct sunxi_pwm_data *data;
>> +};
>> +
>> +static const u16 div_m_table[] = {
>> + 1,
>> + 2,
>> + 4,
>> + 8,
>> + 16,
>> + 32,
>> + 64,
>> + 128,
>> + 256
>> +};
>> +
>> +static inline struct sunxi_pwm_chip *to_sunxi_pwm_chip(struct pwm_chip *chip)
>> +{
>> + return container_of(chip, struct sunxi_pwm_chip, chip);
>> +}
>> +
>> +static inline u32 sunxi_pwm_readl(struct sunxi_pwm_chip *chip,
>> + unsigned long offset)
>> +{
>> + return readl(chip->base + offset);
>> +}
>> +
>> +static inline void sunxi_pwm_writel(struct sunxi_pwm_chip *chip,
>> + u32 val, unsigned long offset)
>> +{
>> + writel(val, chip->base + offset);
>> +}
>> +
>> +static void sunxi_pwm_set_bit(struct sunxi_pwm_chip *sunxi_pwm,
>> + unsigned long reg, u32 bit)
>> +{
>> + u32 val;
>> +
>> + val = sunxi_pwm_readl(sunxi_pwm, reg);
>> + val |= bit;
>> + sunxi_pwm_writel(sunxi_pwm, val, reg);
>> +}
>> +
>> +static void sunxi_pwm_clear_bit(struct sunxi_pwm_chip *sunxi_pwm,
>> + unsigned long reg, u32 bit)
>> +{
>> + u32 val;
>> +
>> + val = sunxi_pwm_readl(sunxi_pwm, reg);
>> + val &= ~bit;
>> + sunxi_pwm_writel(sunxi_pwm, val, reg);
>> +}
>> +
>> +static void sunxi_pwm_set_value(struct sunxi_pwm_chip *sunxi_pwm,
>> + unsigned long reg, u32 mask, u32 val)
>> +{
>> + u32 tmp;
>> +
>> + tmp = sunxi_pwm_readl(sunxi_pwm, reg);
>> + tmp &= ~mask;
>> + tmp |= mask & val;
>> + sunxi_pwm_writel(sunxi_pwm, tmp, reg);
>> +}
>> +
>> +static void sunxi_pwm_set_polarity(struct sunxi_pwm_chip *chip, u32 ch,
>> + enum pwm_polarity polarity)
>> +{
>> + if (polarity == PWM_POLARITY_NORMAL)
>> + sunxi_pwm_set_bit(chip, PWM_CTR_REG(ch), PWM_ACT_STA);
>> + else
>> + sunxi_pwm_clear_bit(chip, PWM_CTR_REG(ch), PWM_ACT_STA);
>> +}
>> +
>> +static void sunxi_dump_reg(struct sunxi_pwm_chip *sunxi_pwm, u8 ch)
>> +{
>> + dev_dbg(sunxi_pwm->chip.dev, "ch: %d\n"
>> + "\tPWM_IRQ_ENABLE_REG(%04x): \t0x%08x\n"
>> + "\tPWM_IRQ_STATUS_REG(%04x): \t0x%08x\n"
>> + "\tCAPTURE_IRQ_ENABLE_REG(%04x): \t0x%08x\n"
>> + "\tCAPTURE_IRQ_STATUS_REG(%04x): \t0x%08x\n"
>> + "\tCLK_CFG_REG(%04x)(%d): \t0x%08x\n"
>> + "\tPWM_DZ_CTR_REG(%04x)(%d): \t0x%08x\n"
>> + "\tPWM_ENABLE_REG(%04x): \t0x%08x\n"
>> + "\tCAPTURE_ENABLE_REG(%04x): \t0x%08x\n"
>> + "\tPWM_CTR_REG(%04x)(%d): \t0x%08x\n"
>> + "\tPWM_PERIOD_REG(%04x)(%d): \t0x%08x\n"
>> + "\tPWM_CNT_REG(%04x)(%d): \t0x%08x\n"
>> + "\tCAPTURE_CTR_REG(%04x)(%d): \t0x%08x\n"
>> + "\tCAPTURE_RISE_REG(%04x)(%d): \t0x%08x\n"
>> + "\tCAPTURE_FALL_REG(%04x)(%d): \t0x%08x\n",
>> + ch,
>> + PWM_IRQ_ENABLE_REG,
>> + readl(sunxi_pwm->base + PWM_IRQ_ENABLE_REG),
>> + PWM_IRQ_STATUS_REG,
>> + readl(sunxi_pwm->base + PWM_IRQ_STATUS_REG),
>> + CAPTURE_IRQ_ENABLE_REG,
>> + readl(sunxi_pwm->base + CAPTURE_IRQ_ENABLE_REG),
>> + CAPTURE_IRQ_STATUS_REG,
>> + readl(sunxi_pwm->base + CAPTURE_IRQ_STATUS_REG),
>> + CLK_CFG_REG(ch),
>> + ch, readl(sunxi_pwm->base + CLK_CFG_REG(ch)),
>> + PWM_DZ_CTR_REG(ch),
>> + ch, readl(sunxi_pwm->base + PWM_DZ_CTR_REG(ch)),
>> + PWM_ENABLE_REG,
>> + readl(sunxi_pwm->base + PWM_ENABLE_REG),
>> + CAPTURE_ENABLE_REG,
>> + readl(sunxi_pwm->base + CAPTURE_ENABLE_REG),
>> + PWM_CTR_REG(ch),
>> + ch, readl(sunxi_pwm->base + PWM_CTR_REG(ch)),
>> + PWM_PERIOD_REG(ch),
>> + ch, readl(sunxi_pwm->base + PWM_PERIOD_REG(ch)),
>> + PWM_CNT_REG(ch),
>> + ch, readl(sunxi_pwm->base + PWM_CNT_REG(ch)),
>> + CAPTURE_CTR_REG(ch),
>> + ch, readl(sunxi_pwm->base + CAPTURE_CTR_REG(ch)),
>> + CAPTURE_RISE_REG(ch),
>> + ch, readl(sunxi_pwm->base + CAPTURE_RISE_REG(ch)),
>> + CAPTURE_FALL_REG(ch),
>> + ch, readl(sunxi_pwm->base + CAPTURE_FALL_REG(ch)));
>> +}
>> +
>> +static int sunxi_pwm_config(struct sunxi_pwm_chip *sunxi_pwm, u8 ch,
>> + struct pwm_state *state)
>> +{
>> + u64 clk_rate, clk_div, val;
>> + u16 prescaler = 0;
>> + u8 id = 0;
>> +
>> + clk_rate = clk_get_rate(sunxi_pwm->clk);
>> + dev_dbg(sunxi_pwm->chip.dev, "clock rate:%lld\n", clk_rate);
>> +
>> + if (clk_rate == 24000000)
>> + sunxi_pwm_clear_bit(sunxi_pwm, CLK_CFG_REG(ch), CLK_SRC);
>> + else
>> + sunxi_pwm_set_bit(sunxi_pwm, CLK_CFG_REG(ch), CLK_SRC);
>> +
>> + if (sunxi_pwm->data->has_prescaler_bypass) {
>> + /* pwm output bypass */
>> + if (ch % 2)
>> + sunxi_pwm_set_bit(sunxi_pwm, CLK_CFG_REG(ch),
>> + CLK_SRC_BYPASS_FIR);
>> + else
>> + sunxi_pwm_set_bit(sunxi_pwm, CLK_CFG_REG(ch),
>> + CLK_SRC_BYPASS_SEC);
>> + return 0;
>> + }
>> +
>> + val = state->period * clk_rate;
>> + do_div(val, NSEC_PER_SEC);
>> + if (val < 1) {
>> + dev_err(sunxi_pwm->chip.dev,
>> + "period expects a larger value\n");
>> + return -EINVAL;
>> + }
>> +
>> + /* calculate and set prescalar, div table, pwn entrie cycle */
>> + clk_div = val;
>> +
>> + while (clk_div > 65535) {
>> + prescaler++;
>> + clk_div = val;
>> + do_div(clk_div, prescaler + 1);
>> + do_div(clk_div, div_m_table[id]);
>> +
>> + if (prescaler == 255) {
>> + prescaler = 0;
>> + id++;
>> + if (id == 9)
>> + return -EINVAL;
>> + }
>> + }
>> +
>> + sunxi_pwm_set_value(sunxi_pwm, PWM_PERIOD_REG(ch),
>> + PWM_ENTIRE_CYCLE, clk_div << 16);
>> + sunxi_pwm_set_value(sunxi_pwm, PWM_CTR_REG(ch),
>> + PWM_PRESCAL_K, prescaler << 0);
>> + sunxi_pwm_set_value(sunxi_pwm, CLK_CFG_REG(ch),
>> + CLK_DIV_M, id << 0);
>> +
>> + /* set duty cycle */
>> + val = (prescaler + 1) * div_m_table[id] * clk_div;
>> + val = state->period;
>> + do_div(val, clk_div);
>> + clk_div = state->duty_cycle;
>> + do_div(clk_div, val);
>> +
>> + sunxi_pwm_set_value(sunxi_pwm, PWM_PERIOD_REG(ch),
>> + PWM_ACT_CYCLE, clk_div << 0);
>> +
>> + return 0;
>> +}
>> +
>> +static int sunxi_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>> + struct pwm_state *state)
>> +{
>> + int ret;
>> + struct sunxi_pwm_chip *sunxi_pwm = to_sunxi_pwm_chip(chip);
>> + struct pwm_state cstate;
>> +
>> + sunxi_dump_reg(sunxi_pwm, pwm->hwpwm);
>> + pwm_get_state(pwm, &cstate);
>> + if (!cstate.enabled) {
>> + ret = clk_prepare_enable(sunxi_pwm->clk);
>> + if (ret) {
>> + dev_err(chip->dev, "failed to enable PWM clock\n");
>> + return ret;
>> + }
>> + }
>> +
>> + spin_lock(&sunxi_pwm->ctrl_lock);
>> +
>> + if (state->polarity != cstate.polarity)
>> + sunxi_pwm_set_polarity(sunxi_pwm, pwm->hwpwm, state->polarity);
>> +
>> + if ((cstate.period != state->period) ||
>> + (cstate.duty_cycle != state->duty_cycle)) {
>> + ret = sunxi_pwm_config(sunxi_pwm, pwm->hwpwm, state);
>> + if (ret) {
>> + dev_err(chip->dev, "failed to enable PWM clock\n");
>> + return ret;
> Here you might want to undo the previous polarity and do clk_disable_unprepare(),
> if any, in order to not reach inconsistency b/w software state of PWM and hardware
> state. Also, unlock the spinlock.
>> + }
>> + }
>> +
>> + if (state->enabled) {
>> + sunxi_pwm_set_bit(sunxi_pwm,
>> + CLK_CFG_REG(pwm->hwpwm), CLK_GATING);
>> +
>> + sunxi_pwm_set_bit(sunxi_pwm,
>> + PWM_ENABLE_REG, PWM_EN(pwm->hwpwm));
>> + } else {
>> + sunxi_pwm_clear_bit(sunxi_pwm,
>> + CLK_CFG_REG(pwm->hwpwm), CLK_GATING);
>> +
>> + sunxi_pwm_clear_bit(sunxi_pwm,
>> + PWM_ENABLE_REG, PWM_EN(pwm->hwpwm));
>> + }
>> +
>> + spin_unlock(&sunxi_pwm->ctrl_lock);
>> + sunxi_dump_reg(sunxi_pwm, pwm->hwpwm);
>> +
>> + return 0;
>> +}
>> +
>> +static void sunxi_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
>> + struct pwm_state *state)
>> +{
>> + struct sunxi_pwm_chip *sunxi_pwm = to_sunxi_pwm_chip(chip);
>> + u64 clk_rate, tmp;
>> + u32 val;
>> + u16 clk_div, act_cycle;
>> + u8 prescal, id;
>> +
>> + clk_rate = clk_get_rate(sunxi_pwm->clk);
>> +
>> + val = sunxi_pwm_readl(sunxi_pwm, PWM_CTR_REG(pwm->hwpwm));
>> + if (PWM_ACT_STA & val)
>> + state->polarity = PWM_POLARITY_NORMAL;
>> + else
>> + state->polarity = PWM_POLARITY_INVERSED;
>> +
>> + prescal = PWM_PRESCAL_K & val;
>> +
>> + val = sunxi_pwm_readl(sunxi_pwm, PWM_ENABLE_REG);
>> + if (PWM_EN(pwm->hwpwm) & val)
>> + state->enabled = true;
>> + else
>> + state->enabled = false;
>> +
>> + val = sunxi_pwm_readl(sunxi_pwm, PWM_PERIOD_REG(pwm->hwpwm));
>> + act_cycle = PWM_ACT_CYCLE & val;
>> + clk_div = val >> 16;
>> +
>> + val = sunxi_pwm_readl(sunxi_pwm, CLK_CFG_REG(pwm->hwpwm));
>> + id = CLK_DIV_M & val;
>> +
>> + tmp = act_cycle * prescal * div_m_table[id] * NSEC_PER_SEC;
>> + state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);
>> + tmp = clk_div * prescal * div_m_table[id] * NSEC_PER_SEC;
>> + state->period = DIV_ROUND_CLOSEST_ULL(tmp, clk_rate);
>> +}
>> +
>> +static const struct pwm_ops sunxi_pwm_ops = {
>> + .apply = sunxi_pwm_apply,
>> + .get_state = sunxi_pwm_get_state,
>> + .owner = THIS_MODULE,
>> +};
>> +
>> +static const struct sunxi_pwm_data sunxi_pwm_data_r40 = {
>> + .has_prescaler_bypass = false,
>> + .has_rdy = true,
>> + .npwm = 8,
>> +};
>> +
>> +static const struct of_device_id sunxi_pwm_dt_ids[] = {
>> + {
>> + .compatible = "allwinner,sun8i-r40-pwm",
>> + .data = &sunxi_pwm_data_r40,
>> + },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, sunxi_pwm_dt_ids);
>> +
>> +static int sunxi_pwm_probe(struct platform_device *pdev)
>> +{
>> + struct sunxi_pwm_chip *pwm;
>> + struct resource *res;
>> + int ret;
>> + const struct of_device_id *match;
>> +
>> + match = of_match_device(sunxi_pwm_dt_ids, &pdev->dev);
>> +
>> + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
>> + if (!pwm)
>> + return -ENOMEM;
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> check for res == NULL
My bad here, no need to check res == NULL since devm_ioremap_resource() will take
care of this case.
Thanks,
Claudiu
>> + pwm->base = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(pwm->base))
>> + return PTR_ERR(pwm->base);
>> +
>> + pwm->clk = devm_clk_get(&pdev->dev, NULL);
>> + if (IS_ERR(pwm->clk))
>> + return PTR_ERR(pwm->clk);
>> +
>> + pwm->data = match->data;
>> + pwm->chip.dev = &pdev->dev;
>> + pwm->chip.ops = &sunxi_pwm_ops;
>> + pwm->chip.base = -1;
>> + pwm->chip.npwm = pwm->data->npwm;
>> + pwm->chip.of_xlate = of_pwm_xlate_with_flags;
>> + pwm->chip.of_pwm_n_cells = 3;
>> +
>> + dev_dbg(pwm->chip.dev, "npwm: %d\n", pwm->chip.npwm);
>> +
>> + spin_lock_init(&pwm->ctrl_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 sunxi_pwm_remove(struct platform_device *pdev)
>> +{
>> + struct sunxi_pwm_chip *pwm = platform_get_drvdata(pdev);
>> +
>> + return pwmchip_remove(&pwm->chip);
>> +}
>> +
>> +static struct platform_driver sunxi_pwm_driver = {
>> + .driver = {
>> + .name = "sun8i-r40-pwm",
>> + .of_match_table = sunxi_pwm_dt_ids,
>> + },
>> + .probe = sunxi_pwm_probe,
>> + .remove = sunxi_pwm_remove,
>> +};
>> +module_platform_driver(sunxi_pwm_driver);
>> +
>> +MODULE_ALIAS("platform:sun8i-r40-pwm");
>> +MODULE_AUTHOR("Hao Zhang <hao5781286@...il.com>");
>> +MODULE_DESCRIPTION("Allwinner sun8i-r40 PWM driver");
>> +MODULE_LICENSE("GPL v2");
>>
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