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Mon, 12 Feb 2024 04:17:44 -0800 (PST) From: Jingbao Qiu To: u.kleine-koenig@pengutronix.de, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu Cc: linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, dlan@gentoo.org, inochiama@outlook.com, Jingbao Qiu Subject: [PATCH v2 2/2] pwm: sophgo: add pwm support for Sophgo CV1800 SoC Date: Mon, 12 Feb 2024 20:17:29 +0800 Message-Id: <20240212121729.1086718-3-qiujingbao.dlmu@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240212121729.1086718-1-qiujingbao.dlmu@gmail.com> References: <20240212121729.1086718-1-qiujingbao.dlmu@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240212_041747_857918_28B82655 X-CRM114-Status: GOOD ( 26.46 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Implement the PWM driver for CV1800. Signed-off-by: Jingbao Qiu --- drivers/pwm/Kconfig | 10 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-cv1800.c | 248 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 259 insertions(+) create mode 100644 drivers/pwm/pwm-cv1800.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 4b956d661755..455f07af94f7 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -186,6 +186,16 @@ config PWM_CROS_EC PWM driver for exposing a PWM attached to the ChromeOS Embedded Controller. +config PWM_CV1800 + tristate "Sophgo CV1800 PWM driver" + depends on ARCH_SOPHGO || COMPILE_TEST + help + Generic PWM framework driver for the Sophgo CV1800 series + SoCs. + + To compile this driver as a module, build the dependecies + as modules, this will be called pwm-cv1800. + config PWM_DWC_CORE tristate depends on HAS_IOMEM diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index c5ec9e168ee7..6c3c4a07a316 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLK) += pwm-clk.o obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o obj-$(CONFIG_PWM_CRC) += pwm-crc.o obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o +obj-$(CONFIG_PWM_CV1800) += pwm-cv1800.o obj-$(CONFIG_PWM_DWC_CORE) += pwm-dwc-core.o obj-$(CONFIG_PWM_DWC) += pwm-dwc.o obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o diff --git a/drivers/pwm/pwm-cv1800.c b/drivers/pwm/pwm-cv1800.c new file mode 100644 index 000000000000..3d7f2ff3a6c2 --- /dev/null +++ b/drivers/pwm/pwm-cv1800.c @@ -0,0 +1,248 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * pwm-cv1800.c: PWM driver for Sophgo cv1800 + * + * Author: Jingbao Qiu + * + * Limitations: + * - It output low when PWM channel disabled. + * - This pwm device supports dynamic loading of PWM parameters. When PWMSTART + * is written from 0 to 1, the register value (HLPERIODn, PERIODn) will be + * temporarily stored inside the PWM. If you want to dynamically change the + * waveform during PWM output, after writing the new value to HLPERIODn and + * PERIODn, write 1 and then 0 to PWMUPDATE[n] to make the new value effective. + * - Supports up to Rate/2 output, and the lowest is about Rate/(2^30-1). + * - By setting HLPERIODn to 0, can produce 100% duty cycle. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define PWM_CV1800_HLPERIOD_BASE 0x00 +#define PWM_CV1800_PERIOD_BASE 0x04 +#define PWM_CV1800_PWM_CV1800_POLARITY 0x40 +#define PWM_CV1800_START 0x44 +#define PWM_CV1800_DONE 0x48 +#define PWM_CV1800_UPDATE 0x4c +#define PWM_CV1800_OE 0xd0 +#define PWM_CV1800_HLPERIOD_SHIFT 0x08 +#define PWM_CV1800_PERIOD_SHIFT 0x08 + +#define PWM_CV1800_HLPERIOD(n) \ + (PWM_CV1800_HLPERIOD_BASE + ((n) * PWM_CV1800_HLPERIOD_SHIFT)) +#define PWM_CV1800_PERIOD(n) \ + (PWM_CV1800_PERIOD_BASE + ((n) * PWM_CV1800_PERIOD_SHIFT)) + +#define PWM_CV1800_UPDATE_MASK(n) (BIT(0) << (n)) +#define PWM_CV1800_OE_MASK(n) (BIT(0) << (n)) +#define PWM_CV1800_START_MASK(n) (BIT(0) << (n)) + +#define PWM_CV1800_MAXPERIOD (BIT(30) - 1) +#define PWM_CV1800_MINPERIOD BIT(1) +#define PWM_CV1800_MINHLPERIOD BIT(0) +#define PWM_CV1800_PERIOD_RESET BIT(1) +#define PWM_CV1800_HLPERIOD_RESET BIT(0) +#define PWM_CV1800_REG_DISABLE 0x0U +#define PWM_CV1800_REG_ENABLE(n) (BIT(0) << (n)) + +struct cv1800_pwm { + struct pwm_chip chip; + struct regmap *map; + struct clk *clk; + unsigned long clk_rate; +}; + +static const struct regmap_config cv1800_pwm_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static inline struct cv1800_pwm *to_cv1800_pwm_dev(struct pwm_chip *chip) +{ + return container_of(chip, struct cv1800_pwm, chip); +} + +static int cv1800_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm, + bool enable) +{ + struct cv1800_pwm *priv = to_cv1800_pwm_dev(chip); + u32 pwm_enable; + + regmap_read(priv->map, PWM_CV1800_START, &pwm_enable); + pwm_enable &= PWM_CV1800_START_MASK(pwm->hwpwm); + + /* + * If the parameters are changed during runtime, Register needs + * to be updated to take effect. + */ + if (pwm_enable && enable) { + regmap_update_bits(priv->map, PWM_CV1800_UPDATE, + PWM_CV1800_UPDATE_MASK(pwm->hwpwm), + PWM_CV1800_REG_ENABLE(pwm->hwpwm)); + regmap_update_bits(priv->map, PWM_CV1800_UPDATE, + PWM_CV1800_UPDATE_MASK(pwm->hwpwm), + PWM_CV1800_REG_DISABLE); + } else if (!pwm_enable && enable) { + regmap_update_bits(priv->map, PWM_CV1800_OE, + PWM_CV1800_OE_MASK(pwm->hwpwm), + PWM_CV1800_REG_ENABLE(pwm->hwpwm)); + regmap_update_bits(priv->map, PWM_CV1800_START, + PWM_CV1800_START_MASK(pwm->hwpwm), + PWM_CV1800_REG_ENABLE(pwm->hwpwm)); + } else if (pwm_enable && !enable) { + regmap_update_bits(priv->map, PWM_CV1800_OE, + PWM_CV1800_OE_MASK(pwm->hwpwm), + PWM_CV1800_REG_DISABLE); + regmap_update_bits(priv->map, PWM_CV1800_START, + PWM_CV1800_START_MASK(pwm->hwpwm), + PWM_CV1800_REG_DISABLE); + } + + return 0; +} + +static int cv1800_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct cv1800_pwm *priv = to_cv1800_pwm_dev(chip); + u32 period_val, hlperiod_val; + u64 tem; + + if (state->polarity != PWM_POLARITY_NORMAL) + return -EINVAL; + + tem = mul_u64_u64_div_u64(state->period, priv->clk_rate, NSEC_PER_SEC); + if (tem > PWM_CV1800_MAXPERIOD || tem < PWM_CV1800_MINPERIOD) + return -EINVAL; + period_val = (u32)tem; + + tem = mul_u64_u64_div_u64(state->period - state->duty_cycle, + priv->clk_rate, NSEC_PER_SEC); + if (tem > period_val) + return -EINVAL; + hlperiod_val = (u32)tem; + + regmap_write(priv->map, PWM_CV1800_PERIOD(pwm->hwpwm), period_val); + regmap_write(priv->map, PWM_CV1800_HLPERIOD(pwm->hwpwm), hlperiod_val); + + cv1800_pwm_enable(chip, pwm, state->enabled); + + return 0; +} + +static int cv1800_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct cv1800_pwm *priv = to_cv1800_pwm_dev(chip); + u32 period_val, hlperiod_val; + u64 period_ns = 0; + u64 duty_ns = 0; + u32 enable = 0; + + regmap_read(priv->map, PWM_CV1800_PERIOD(pwm->hwpwm), &period_val); + regmap_read(priv->map, PWM_CV1800_HLPERIOD(pwm->hwpwm), &hlperiod_val); + + if (period_val != PWM_CV1800_PERIOD_RESET || + hlperiod_val != PWM_CV1800_HLPERIOD_RESET) { + period_ns = DIV_ROUND_UP_ULL(period_val * NSEC_PER_SEC, priv->clk_rate); + duty_ns = DIV_ROUND_UP_ULL(hlperiod_val * period_ns, period_val); + + regmap_read(priv->map, PWM_CV1800_START, &enable); + + enable &= PWM_CV1800_START_MASK(pwm->hwpwm); + } + + state->period = period_ns; + state->duty_cycle = duty_ns; + state->enabled = enable; + state->polarity = PWM_POLARITY_NORMAL; + + return 0; +} + +static const struct pwm_ops cv1800_pwm_ops = { + .apply = cv1800_pwm_apply, + .get_state = cv1800_pwm_get_state, +}; + +static void devm_clk_rate_exclusive_put(void *data) +{ + struct clk *clk = data; + + clk_rate_exclusive_put(clk); +} + +static int cv1800_pwm_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cv1800_pwm *priv; + void __iomem *base; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + priv->map = devm_regmap_init_mmio(&pdev->dev, base, + &cv1800_pwm_regmap_config); + if (IS_ERR(priv->map)) + return PTR_ERR(priv->map); + + priv->clk = devm_clk_get_enabled(&pdev->dev, NULL); + if (IS_ERR(priv->clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk), + "clk not found\n"); + + ret = clk_rate_exclusive_get(priv->clk); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "failed to get exclusive rate\n"); + + ret = devm_add_action_or_reset(&pdev->dev, devm_clk_rate_exclusive_put, + priv->clk); + if (ret) { + clk_rate_exclusive_put(priv->clk); + return ret; + } + + priv->clk_rate = clk_get_rate(priv->clk); + if (!priv->clk_rate) + return dev_err_probe(&pdev->dev, -EINVAL, + "Invalid clock rate: %lu\n", priv->clk_rate); + + priv->chip.dev = dev; + priv->chip.ops = &cv1800_pwm_ops; + priv->chip.npwm = 4; + priv->chip.atomic = true; + + return devm_pwmchip_add(dev, &priv->chip); +} + +static const struct of_device_id cv1800_pwm_dt_ids[] = { + { .compatible = "sophgo,cv1800-pwm" }, + {}, +}; +MODULE_DEVICE_TABLE(of, cv1800_pwm_dt_ids); + +static struct platform_driver cv1800_pwm_driver = { + .driver = { + .name = "cv1800-pwm", + .of_match_table = cv1800_pwm_dt_ids, + }, + .probe = cv1800_pwm_probe, +}; +module_platform_driver(cv1800_pwm_driver); + +MODULE_AUTHOR("Jingbao Qiu"); +MODULE_DESCRIPTION("Sophgo cv1800 PWM Driver"); +MODULE_LICENSE("GPL");