+++ /dev/null
-From 201be68268eddb1568c41780a62868cc1666a2de Mon Sep 17 00:00:00 2001
-From: John Crispin <john@phrozen.org>
-Date: Fri, 6 May 2016 02:55:48 +0200
-Subject: [PATCH 16/57] pwm: add pwm-mediatek
-
-Signed-off-by: John Crispin <john@phrozen.org>
----
- drivers/pwm/Kconfig | 9 ++
- drivers/pwm/Makefile | 1 +
- drivers/pwm/pwm-mediatek.c | 230 +++++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 240 insertions(+)
- create mode 100644 drivers/pwm/pwm-mediatek.c
-
---- a/drivers/pwm/Kconfig
-+++ b/drivers/pwm/Kconfig
-@@ -282,6 +282,15 @@ config PWM_MTK_DISP
- To compile this driver as a module, choose M here: the module
- will be called pwm-mtk-disp.
-
-+config PWM_MEDIATEK
-+ tristate "MediaTek PWM support"
-+ depends on ARCH_MEDIATEK || COMPILE_TEST
-+ help
-+ Generic PWM framework driver for Mediatek ARM SoC.
-+
-+ To compile this driver as a module, choose M here: the module
-+ will be called pwm-mxs.
-+
- config PWM_MXS
- tristate "Freescale MXS PWM support"
- depends on ARCH_MXS && OF
---- a/drivers/pwm/Makefile
-+++ b/drivers/pwm/Makefile
-@@ -25,6 +25,7 @@ obj-$(CONFIG_PWM_LPSS) += pwm-lpss.o
- obj-$(CONFIG_PWM_LPSS_PCI) += pwm-lpss-pci.o
- obj-$(CONFIG_PWM_LPSS_PLATFORM) += pwm-lpss-platform.o
- obj-$(CONFIG_PWM_MESON) += pwm-meson.o
-+obj-$(CONFIG_PWM_MEDIATEK) += pwm-mediatek.o
- obj-$(CONFIG_PWM_MTK_DISP) += pwm-mtk-disp.o
- obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
- obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o
---- /dev/null
-+++ b/drivers/pwm/pwm-mediatek.c
-@@ -0,0 +1,230 @@
-+/*
-+ * Mediatek Pulse Width Modulator driver
-+ *
-+ * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
-+ *
-+ * 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/err.h>
-+#include <linux/io.h>
-+#include <linux/ioport.h>
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/clk.h>
-+#include <linux/of.h>
-+#include <linux/platform_device.h>
-+#include <linux/pwm.h>
-+#include <linux/slab.h>
-+#include <linux/types.h>
-+
-+#define NUM_PWM 5
-+
-+/* PWM registers and bits definitions */
-+#define PWMCON 0x00
-+#define PWMHDUR 0x04
-+#define PWMLDUR 0x08
-+#define PWMGDUR 0x0c
-+#define PWMWAVENUM 0x28
-+#define PWMDWIDTH 0x2c
-+#define PWMTHRES 0x30
-+
-+/**
-+ * struct mtk_pwm_chip - struct representing pwm chip
-+ *
-+ * @mmio_base: base address of pwm chip
-+ * @chip: linux pwm chip representation
-+ */
-+struct mtk_pwm_chip {
-+ void __iomem *mmio_base;
-+ struct pwm_chip chip;
-+ struct clk *clk_top;
-+ struct clk *clk_main;
-+ struct clk *clk_pwm[NUM_PWM];
-+};
-+
-+static inline struct mtk_pwm_chip *to_mtk_pwm_chip(struct pwm_chip *chip)
-+{
-+ return container_of(chip, struct mtk_pwm_chip, chip);
-+}
-+
-+static inline u32 mtk_pwm_readl(struct mtk_pwm_chip *chip, unsigned int num,
-+ unsigned long offset)
-+{
-+ return ioread32(chip->mmio_base + 0x10 + (num * 0x40) + offset);
-+}
-+
-+static inline void mtk_pwm_writel(struct mtk_pwm_chip *chip,
-+ unsigned int num, unsigned long offset,
-+ unsigned long val)
-+{
-+ iowrite32(val, chip->mmio_base + 0x10 + (num * 0x40) + offset);
-+}
-+
-+static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
-+ int duty_ns, int period_ns)
-+{
-+ struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
-+ u32 resolution = 100 / 4;
-+ u32 clkdiv = 0;
-+
-+ resolution = 1000000000 / (clk_get_rate(pc->clk_pwm[pwm->hwpwm]));
-+
-+ while (period_ns / resolution > 8191) {
-+ clkdiv++;
-+ resolution *= 2;
-+ }
-+
-+ if (clkdiv > 7)
-+ return -1;
-+
-+ mtk_pwm_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | BIT(3) | clkdiv);
-+ mtk_pwm_writel(pc, pwm->hwpwm, PWMDWIDTH, period_ns / resolution);
-+ mtk_pwm_writel(pc, pwm->hwpwm, PWMTHRES, duty_ns / resolution);
-+ return 0;
-+}
-+
-+static int mtk_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
-+{
-+ struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
-+ u32 val;
-+ int ret;
-+
-+ ret = clk_prepare(pc->clk_pwm[pwm->hwpwm]);
-+ if (ret < 0)
-+ return ret;
-+
-+ val = ioread32(pc->mmio_base);
-+ val |= BIT(pwm->hwpwm);
-+ iowrite32(val, pc->mmio_base);
-+
-+ return 0;
-+}
-+
-+static void mtk_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
-+{
-+ struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip);
-+ u32 val;
-+
-+ val = ioread32(pc->mmio_base);
-+ val &= ~BIT(pwm->hwpwm);
-+ iowrite32(val, pc->mmio_base);
-+ clk_unprepare(pc->clk_pwm[pwm->hwpwm]);
-+}
-+
-+static const struct pwm_ops mtk_pwm_ops = {
-+ .config = mtk_pwm_config,
-+ .enable = mtk_pwm_enable,
-+ .disable = mtk_pwm_disable,
-+ .owner = THIS_MODULE,
-+};
-+
-+static int mtk_pwm_probe(struct platform_device *pdev)
-+{
-+ struct mtk_pwm_chip *pc;
-+ struct resource *r;
-+ int ret;
-+
-+ pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
-+ if (!pc)
-+ return -ENOMEM;
-+
-+ 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);
-+
-+ pc->clk_main = devm_clk_get(&pdev->dev, "main");
-+ if (IS_ERR(pc->clk_main))
-+ return PTR_ERR(pc->clk_main);
-+
-+ pc->clk_top = devm_clk_get(&pdev->dev, "top");
-+ if (IS_ERR(pc->clk_top))
-+ return PTR_ERR(pc->clk_top);
-+
-+ pc->clk_pwm[0] = devm_clk_get(&pdev->dev, "pwm1");
-+ if (IS_ERR(pc->clk_pwm[0]))
-+ return PTR_ERR(pc->clk_pwm[0]);
-+
-+ pc->clk_pwm[1] = devm_clk_get(&pdev->dev, "pwm2");
-+ if (IS_ERR(pc->clk_pwm[1]))
-+ return PTR_ERR(pc->clk_pwm[1]);
-+
-+ pc->clk_pwm[2] = devm_clk_get(&pdev->dev, "pwm3");
-+ if (IS_ERR(pc->clk_pwm[2]))
-+ return PTR_ERR(pc->clk_pwm[2]);
-+
-+ pc->clk_pwm[3] = devm_clk_get(&pdev->dev, "pwm4");
-+ if (IS_ERR(pc->clk_pwm[3]))
-+ return PTR_ERR(pc->clk_pwm[3]);
-+
-+ pc->clk_pwm[4] = devm_clk_get(&pdev->dev, "pwm5");
-+ if (IS_ERR(pc->clk_pwm[4]))
-+ return PTR_ERR(pc->clk_pwm[4]);
-+
-+ ret = clk_prepare(pc->clk_top);
-+ if (ret < 0)
-+ return ret;
-+
-+ ret = clk_prepare(pc->clk_main);
-+ if (ret < 0)
-+ goto disable_clk_top;
-+
-+ platform_set_drvdata(pdev, pc);
-+
-+ pc->chip.dev = &pdev->dev;
-+ pc->chip.ops = &mtk_pwm_ops;
-+ pc->chip.base = -1;
-+ pc->chip.npwm = NUM_PWM;
-+
-+ ret = pwmchip_add(&pc->chip);
-+ if (ret < 0) {
-+ dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
-+ goto disable_clk_main;
-+ }
-+
-+ return 0;
-+
-+disable_clk_main:
-+ clk_unprepare(pc->clk_main);
-+disable_clk_top:
-+ clk_unprepare(pc->clk_top);
-+
-+ return ret;
-+}
-+
-+static int mtk_pwm_remove(struct platform_device *pdev)
-+{
-+ struct mtk_pwm_chip *pc = platform_get_drvdata(pdev);
-+ int i;
-+
-+ for (i = 0; i < NUM_PWM; i++)
-+ pwm_disable(&pc->chip.pwms[i]);
-+
-+ return pwmchip_remove(&pc->chip);
-+}
-+
-+static const struct of_device_id mtk_pwm_of_match[] = {
-+ { .compatible = "mediatek,mt7623-pwm" },
-+ { }
-+};
-+
-+MODULE_DEVICE_TABLE(of, mtk_pwm_of_match);
-+
-+static struct platform_driver mtk_pwm_driver = {
-+ .driver = {
-+ .name = "mtk-pwm",
-+ .owner = THIS_MODULE,
-+ .of_match_table = mtk_pwm_of_match,
-+ },
-+ .probe = mtk_pwm_probe,
-+ .remove = mtk_pwm_remove,
-+};
-+
-+module_platform_driver(mtk_pwm_driver);
-+
-+MODULE_LICENSE("GPL");
-+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
-+MODULE_ALIAS("platform:mtk-pwm");
projects / openwrt / openwrt.git / blobdiff