Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753460Ab3J3HHo (ORCPT ); Wed, 30 Oct 2013 03:07:44 -0400 Received: from [213.199.154.184] ([213.199.154.184]:16331 "EHLO db8outboundpool.messaging.microsoft.com" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751681Ab3J3HHl (ORCPT ); Wed, 30 Oct 2013 03:07:41 -0400 X-Forefront-Antispam-Report: CIP:70.37.183.190;KIP:(null);UIP:(null);IPV:NLI;H:mail.freescale.net;RD:none;EFVD:NLI X-SpamScore: 4 X-BigFish: VS4(z551bizc8kzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6hzz1de098h8275bh1de097hz2dh2a8h839he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h2218h2216h1155h) From: Xiubo Li To: , CC: , , , , , , , , , , , , , , , Alison Wang , Jingchang Lu Subject: [RFCv2][PATCHv5 1/4] pwm: Add Freescale FTM PWM driver support Date: Wed, 30 Oct 2013 14:23:21 +0800 Message-ID: <1383114204-17264-2-git-send-email-Li.Xiubo@freescale.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1383114204-17264-1-git-send-email-Li.Xiubo@freescale.com> References: <1383114204-17264-1-git-send-email-Li.Xiubo@freescale.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: freescale.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11745 Lines: 462 The FTM PWM device can be found on Vybrid VF610 Tower and Layerscape LS-1 SoCs. Signed-off-by: Xiubo Li Signed-off-by: Alison Wang Signed-off-by: Jingchang Lu Reviewed-by: Sascha Hauer --- drivers/pwm/Kconfig | 10 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-fsl-ftm.c | 401 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 412 insertions(+) create mode 100644 drivers/pwm/pwm-fsl-ftm.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 75840b5..8144fb0 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -62,6 +62,16 @@ config PWM_BFIN To compile this driver as a module, choose M here: the module will be called pwm-bfin. +config PWM_FSL_FTM + tristate "Freescale FTM PWM support" + depends on OF + help + Generic FTM PWM framework driver for Freescale VF610 and + Layerscape LS-1 SoCs. + + To compile this driver as a module, choose M here: the module + will be called pwm-fsl-ftm. + config PWM_IMX tristate "i.MX PWM support" depends on ARCH_MXC diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 77a8c18..f383784 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_PWM_SYSFS) += sysfs.o obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o +obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o obj-$(CONFIG_PWM_IMX) += pwm-imx.o obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c new file mode 100644 index 0000000..6ee20eb --- /dev/null +++ b/drivers/pwm/pwm-fsl-ftm.c @@ -0,0 +1,401 @@ +/* + * Freescale FTM PWM Driver + * + * Copyright 2012-2013 Freescale Semiconductor, Inc. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define FTM_SC 0x00 +#define FTMSC_CLK_MASK 0x03 +#define FTMSC_CLK_OFFSET 0x03 +#define FTMSC_CLKSYS (0x01 << 3) +#define FTMSC_CLKFIX (0x02 << 3) +#define FTMSC_CLKEXT (0x03 << 3) +#define FTMSC_PS_MASK 0x07 +#define FTMSC_PS_OFFSET 0x00 + +#define FTM_CNT 0x04 +#define FTM_MOD 0x08 + +#define FTM_CSC_BASE 0x0C +#define FTM_CSC(_channel) (FTM_CSC_BASE + ((_channel) * 8)) +#define FTMCnSC_MSB BIT(5) +#define FTMCnSC_MSA BIT(4) +#define FTMCnSC_ELSB BIT(3) +#define FTMCnSC_ELSA BIT(2) + +#define FTM_CV_BASE 0x10 +#define FTM_CV(_channel) (FTM_CV_BASE + ((_channel) * 8)) + +#define FTM_CNTIN 0x4C +#define FTM_STATUS 0x50 + +#define FTM_MODE 0x54 +#define FTMMODE_FTMEN BIT(0) +#define FTMMODE_INIT BIT(2) +#define FTMMODE_PWMSYNC BIT(3) + +#define FTM_SYNC 0x58 +#define FTM_OUTINIT 0x5C +#define FTM_OUTMASK 0x60 +#define FTM_COMBINE 0x64 +#define FTM_DEADTIME 0x68 +#define FTM_EXTTRIG 0x6C +#define FTM_POL 0x70 +#define FTM_FMS 0x74 +#define FTM_FILTER 0x78 +#define FTM_FLTCTRL 0x7C +#define FTM_QDCTRL 0x80 +#define FTM_CONF 0x84 +#define FTM_FLTPOL 0x88 +#define FTM_SYNCONF 0x8C +#define FTM_INVCTRL 0x90 +#define FTM_SWOCTRL 0x94 +#define FTM_PWMLOAD 0x98 + +#define FTM_CNTIN_VAL 0x00 +#define FTM_MAX_CHANNEL 8 + +struct fsl_pwm_chip { + struct pwm_chip chip; + + struct clk *sys_clk; + struct clk *counter_clk; + unsigned int counter_clk_select; + unsigned int counter_clk_enable; + unsigned int clk_ps; + + void __iomem *base; +}; + +static inline struct fsl_pwm_chip *to_fsl_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct fsl_pwm_chip, chip); +} + +static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) +{ + int ret; + struct fsl_pwm_chip *fpc; + + fpc = to_fsl_chip(chip); + + ret = clk_prepare_enable(fpc->sys_clk); + if (ret) + return ret; + + return 0; +} + +static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct fsl_pwm_chip *fpc; + + fpc = to_fsl_chip(chip); + + clk_disable_unprepare(fpc->sys_clk); +} + +static unsigned long fsl_rate_to_cycles(struct fsl_pwm_chip *fpc, + unsigned long time_ns) +{ + unsigned long long c; + unsigned long ps = 1 << fpc->clk_ps; + + c = clk_get_rate(fpc->counter_clk); + c = c * time_ns; + do_div(c, 1000000000UL); + do_div(c, ps); + + return (unsigned long)c; +} + +static int fsl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, + int duty_ns, int period_ns) +{ + unsigned long period_cycles, duty_cycles; + unsigned long cntin = FTM_CNTIN_VAL; + struct fsl_pwm_chip *fpc; + + fpc = to_fsl_chip(chip); + + period_cycles = fsl_rate_to_cycles(fpc, period_ns); + if (period_cycles > 0xFFFF) { + dev_err(chip->dev, "required PWM period cycles(%lu) overflow " + "16-bits counter!\n", period_cycles); + return -EINVAL; + } + + duty_cycles = fsl_rate_to_cycles(fpc, duty_ns); + if (duty_cycles >= 0xFFFF) { + dev_err(chip->dev, "required PWM duty cycles(%lu) overflow " + "16-bits counter!\n", duty_cycles); + return -EINVAL; + } + + writel(FTMCnSC_MSB | FTMCnSC_ELSB, fpc->base + FTM_CSC(pwm->hwpwm)); + + writel(0xF0, fpc->base + FTM_OUTMASK); + writel(0x0F, fpc->base + FTM_OUTINIT); + writel(FTM_CNTIN_VAL, fpc->base + FTM_CNTIN); + + writel(period_cycles + cntin - 1, fpc->base + FTM_MOD); + writel(duty_cycles + cntin, fpc->base + FTM_CV(pwm->hwpwm)); + + return 0; +} + +static int fsl_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm, + enum pwm_polarity polarity) +{ + unsigned long reg; + struct fsl_pwm_chip *fpc; + + fpc = to_fsl_chip(chip); + + reg = readl(fpc->base + FTM_POL); + if (polarity == PWM_POLARITY_INVERSED) + reg |= BIT(pwm->hwpwm); + else + reg &= ~BIT(pwm->hwpwm); + writel(reg, fpc->base + FTM_POL); + + return 0; +} + +static int fsl_counter_clock_enable(struct fsl_pwm_chip *fpc) +{ + int ret; + unsigned long reg; + + if (fpc->counter_clk_enable++) + return 0; + + ret = clk_prepare_enable(fpc->counter_clk); + if (ret) + return ret; + + reg = readl(fpc->base + FTM_SC); + reg &= ~((FTMSC_CLK_MASK << FTMSC_CLK_OFFSET) | + (FTMSC_PS_MASK << FTMSC_PS_OFFSET)); + /* select counter clock source */ + switch (fpc->counter_clk_select) { + case VF610_CLK_FTM0: + reg |= FTMSC_CLKSYS; + break; + case VF610_CLK_FTM0_FIX_SEL: + reg |= FTMSC_CLKFIX; + break; + case VF610_CLK_FTM0_EXT_SEL: + reg |= FTMSC_CLKEXT; + break; + default: + break; + } + reg |= fpc->clk_ps; + writel(reg, fpc->base + FTM_SC); + + return 0; +} + +static int fsl_counter_clock_disable(struct fsl_pwm_chip *fpc) +{ + unsigned long reg; + + if (--fpc->counter_clk_enable) + return 0; + + writel(0xFF, fpc->base + FTM_OUTMASK); + reg = readl(fpc->base + FTM_SC); + reg &= ~(FTMSC_CLK_MASK << FTMSC_CLK_OFFSET); + writel(reg, fpc->base + FTM_SC); + + clk_disable_unprepare(fpc->counter_clk); + + return 0; +} + +static int fsl_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct fsl_pwm_chip *fpc; + + fpc = to_fsl_chip(chip); + + fsl_counter_clock_enable(fpc); + + return 0; +} + +static void fsl_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct fsl_pwm_chip *fpc; + + fpc = to_fsl_chip(chip); + + fsl_counter_clock_disable(fpc); +} + +static const struct pwm_ops fsl_pwm_ops = { + .request = fsl_pwm_request, + .free = fsl_pwm_free, + .config = fsl_pwm_config, + .set_polarity = fsl_pwm_set_polarity, + .enable = fsl_pwm_enable, + .disable = fsl_pwm_disable, + .owner = THIS_MODULE, +}; + +static int fsl_pwm_calculate_ps(struct fsl_pwm_chip *fpc) +{ + unsigned long long sys_rate, counter_rate, ratio; + + sys_rate = clk_get_rate(fpc->sys_clk); + if (!sys_rate) + return -EINVAL; + + counter_rate = clk_get_rate(fpc->counter_clk); + if (!counter_rate) { + fpc->counter_clk = fpc->sys_clk; + fpc->counter_clk_select = VF610_CLK_FTM0; + dev_warn(fpc->chip.dev, + "the counter source clock is a dummy clock, " + "so select the system clock as default!\n"); + } + + switch (fpc->counter_clk_select) { + case VF610_CLK_FTM0_FIX_SEL: + ratio = 2 * counter_rate - 1; + do_div(ratio, sys_rate); + fpc->clk_ps = ratio; + break; + case VF610_CLK_FTM0_EXT_SEL: + ratio = 4 * counter_rate - 1; + do_div(ratio, sys_rate); + fpc->clk_ps = ratio; + break; + case VF610_CLK_FTM0: + fpc->clk_ps = 7; + default: + break; + } + + return 0; +} + +static int fsl_pwm_parse_clk_ps(struct fsl_pwm_chip *fpc) +{ + int ret; + struct of_phandle_args clkspec; + struct device_node *np = fpc->chip.dev->of_node; + + fpc->sys_clk = devm_clk_get(fpc->chip.dev, "ftm0"); + if (IS_ERR(fpc->sys_clk)) { + ret = PTR_ERR(fpc->sys_clk); + dev_err(fpc->chip.dev, + "failed to get \"ftm0\" clock %d\n", ret); + return ret; + } + + fpc->counter_clk = devm_clk_get(fpc->chip.dev, "ftm0_counter"); + if (IS_ERR(fpc->counter_clk)) { + ret = PTR_ERR(fpc->counter_clk); + dev_err(fpc->chip.dev, + "failed to get \"ftm0_counter\" clock %d\n", + ret); + return ret; + } + + ret = of_parse_phandle_with_args(np, "clocks", "#clock-cells", 1, + &clkspec); + if (ret) + return ret; + + fpc->counter_clk_select = clkspec.args[0]; + + return fsl_pwm_calculate_ps(fpc); +} + +static int fsl_pwm_probe(struct platform_device *pdev) +{ + int ret = 0; + struct fsl_pwm_chip *fpc; + struct resource *res; + + fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL); + if (!fpc) + return -ENOMEM; + + fpc->chip.dev = &pdev->dev; + fpc->counter_clk_enable = 0; + + ret = fsl_pwm_parse_clk_ps(fpc); + if (ret < 0) + return ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + fpc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(fpc->base)) { + ret = PTR_ERR(fpc->base); + return ret; + } + + fpc->chip.ops = &fsl_pwm_ops; + fpc->chip.of_xlate = of_pwm_xlate_with_flags; + fpc->chip.of_pwm_n_cells = 3; + fpc->chip.base = -1; + fpc->chip.npwm = FTM_MAX_CHANNEL; + ret = pwmchip_add(&fpc->chip); + if (ret < 0) { + dev_err(&pdev->dev, "failed to add PWM chip %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, fpc); + + return 0; +} + +static int fsl_pwm_remove(struct platform_device *pdev) +{ + struct fsl_pwm_chip *fpc; + + fpc = platform_get_drvdata(pdev); + + return pwmchip_remove(&fpc->chip); +} + +static const struct of_device_id fsl_pwm_dt_ids[] = { + { .compatible = "fsl,vf610-ftm-pwm", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_pwm_dt_ids); + +static struct platform_driver fsl_pwm_driver = { + .driver = { + .name = "fsl-ftm-pwm", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(fsl_pwm_dt_ids), + }, + .probe = fsl_pwm_probe, + .remove = fsl_pwm_remove, +}; +module_platform_driver(fsl_pwm_driver); + +MODULE_DESCRIPTION("Freescale FTM PWM Driver"); +MODULE_AUTHOR("Xiubo Li "); +MODULE_LICENSE("GPL"); -- 1.8.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/