diff options
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-vt8500/Makefile | 2 | ||||
| -rw-r--r-- | drivers/pwm/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/pwm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-vt8500.c (renamed from arch/arm/mach-vt8500/pwm.c) | 169 |
5 files changed, 66 insertions, 116 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 84449dd8f031..8da8f82f6fe3 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -962,7 +962,6 @@ config ARCH_VT8500 select ARCH_HAS_CPUFREQ select GENERIC_CLOCKEVENTS select ARCH_REQUIRE_GPIOLIB - select HAVE_PWM help Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip. diff --git a/arch/arm/mach-vt8500/Makefile b/arch/arm/mach-vt8500/Makefile index 81aedb7c893c..8df9e4abab6d 100644 --- a/arch/arm/mach-vt8500/Makefile +++ b/arch/arm/mach-vt8500/Makefile @@ -5,5 +5,3 @@ obj-$(CONFIG_VTWM_VERSION_WM8505) += devices-wm8505.o obj-$(CONFIG_MACH_BV07) += bv07.o obj-$(CONFIG_MACH_WM8505_7IN_NETBOOK) += wm8505_7in.o - -obj-$(CONFIG_HAVE_PWM) += pwm.o diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 0d9aa92636c3..a93feffbc36a 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -55,4 +55,13 @@ config PWM_TEGRA To compile this driver as a module, choose M here: the module will be called pwm-tegra. +config PWM_VT8500 + tristate "vt8500 pwm support" + depends on ARCH_VT8500 + help + Generic PWM framework driver for vt8500. + + To compile this driver as a module, choose M here: the module + will be called pwm-vt8500. + endif diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index a1d87b173312..b7c0fcf4de16 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_PWM_IMX) += pwm-imx.o obj-$(CONFIG_PWM_PXA) += pwm-pxa.o obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o +obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o diff --git a/arch/arm/mach-vt8500/pwm.c b/drivers/pwm/pwm-vt8500.c index 8ad825e93592..3db0746f7200 100644 --- a/arch/arm/mach-vt8500/pwm.c +++ b/drivers/pwm/pwm-vt8500.c @@ -26,21 +26,13 @@ #define VT8500_NR_PWMS 4 -static DEFINE_MUTEX(pwm_lock); -static LIST_HEAD(pwm_list); - -struct pwm_device { - struct list_head node; - struct platform_device *pdev; - - const char *label; - - void __iomem *regbase; - - unsigned int use_count; - unsigned int pwm_id; +struct vt8500_chip { + struct pwm_chip chip; + void __iomem *base; }; +#define to_vt8500_chip(chip) container_of(chip, struct vt8500_chip, chip) + #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) static inline void pwm_busy_wait(void __iomem *reg, u8 bitmask) { @@ -53,14 +45,13 @@ static inline void pwm_busy_wait(void __iomem *reg, u8 bitmask) bitmask); } -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) +static int vt8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, + int duty_ns, int period_ns) { + struct vt8500_chip *vt8500 = to_vt8500_chip(chip); unsigned long long c; unsigned long period_cycles, prescale, pv, dc; - if (pwm == NULL || period_ns == 0 || duty_ns > period_ns) - return -EINVAL; - c = 25000000/2; /* wild guess --- need to implement clocks */ c = c * period_ns; do_div(c, 1000000000); @@ -80,104 +71,58 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) do_div(c, period_ns); dc = c; - pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 1)); - writel(prescale, pwm->regbase + 0x4 + (pwm->pwm_id << 4)); + pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 1)); + writel(prescale, vt8500->base + 0x4 + (pwm->hwpwm << 4)); - pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 2)); - writel(pv, pwm->regbase + 0x8 + (pwm->pwm_id << 4)); + pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 2)); + writel(pv, vt8500->base + 0x8 + (pwm->hwpwm << 4)); - pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 3)); - writel(dc, pwm->regbase + 0xc + (pwm->pwm_id << 4)); + pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 3)); + writel(dc, vt8500->base + 0xc + (pwm->hwpwm << 4)); return 0; } -EXPORT_SYMBOL(pwm_config); -int pwm_enable(struct pwm_device *pwm) +static int vt8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { - pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 0)); - writel(5, pwm->regbase + (pwm->pwm_id << 4)); - return 0; -} -EXPORT_SYMBOL(pwm_enable); - -void pwm_disable(struct pwm_device *pwm) -{ - pwm_busy_wait(pwm->regbase + 0x40 + pwm->pwm_id, (1 << 0)); - writel(0, pwm->regbase + (pwm->pwm_id << 4)); -} -EXPORT_SYMBOL(pwm_disable); - -struct pwm_device *pwm_request(int pwm_id, const char *label) -{ - struct pwm_device *pwm; - int found = 0; - - mutex_lock(&pwm_lock); + struct vt8500_chip *vt8500 = to_vt8500_chip(chip); - list_for_each_entry(pwm, &pwm_list, node) { - if (pwm->pwm_id == pwm_id) { - found = 1; - break; - } - } - - if (found) { - if (pwm->use_count == 0) { - pwm->use_count++; - pwm->label = label; - } else { - pwm = ERR_PTR(-EBUSY); - } - } else { - pwm = ERR_PTR(-ENOENT); - } - - mutex_unlock(&pwm_lock); - return pwm; + pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 0)); + writel(5, vt8500->base + (pwm->hwpwm << 4)); + return 0; } -EXPORT_SYMBOL(pwm_request); -void pwm_free(struct pwm_device *pwm) +static void vt8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { - mutex_lock(&pwm_lock); - - if (pwm->use_count) { - pwm->use_count--; - pwm->label = NULL; - } else { - pr_warning("PWM device already freed\n"); - } + struct vt8500_chip *vt8500 = to_vt8500_chip(chip); - mutex_unlock(&pwm_lock); + pwm_busy_wait(vt8500->base + 0x40 + pwm->hwpwm, (1 << 0)); + writel(0, vt8500->base + (pwm->hwpwm << 4)); } -EXPORT_SYMBOL(pwm_free); -static inline void __add_pwm(struct pwm_device *pwm) -{ - mutex_lock(&pwm_lock); - list_add_tail(&pwm->node, &pwm_list); - mutex_unlock(&pwm_lock); -} +static struct pwm_ops vt8500_pwm_ops = { + .enable = vt8500_pwm_enable, + .disable = vt8500_pwm_disable, + .config = vt8500_pwm_config, + .owner = THIS_MODULE, +}; static int __devinit pwm_probe(struct platform_device *pdev) { - struct pwm_device *pwms; + struct vt8500_chip *chip; struct resource *r; - int ret = 0; - int i; + int ret; - pwms = kzalloc(sizeof(struct pwm_device) * VT8500_NR_PWMS, GFP_KERNEL); - if (pwms == NULL) { + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (chip == NULL) { dev_err(&pdev->dev, "failed to allocate memory\n"); return -ENOMEM; } - for (i = 0; i < VT8500_NR_PWMS; i++) { - pwms[i].use_count = 0; - pwms[i].pwm_id = i; - pwms[i].pdev = pdev; - } + chip->chip.dev = &pdev->dev; + chip->chip.ops = &vt8500_pwm_ops; + chip->chip.base = -1; + chip->chip.npwm = VT8500_NR_PWMS; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (r == NULL) { @@ -193,51 +138,49 @@ static int __devinit pwm_probe(struct platform_device *pdev) goto err_free; } - pwms[0].regbase = ioremap(r->start, resource_size(r)); - if (pwms[0].regbase == NULL) { + chip->base = ioremap(r->start, resource_size(r)); + if (chip->base == NULL) { dev_err(&pdev->dev, "failed to ioremap() registers\n"); ret = -ENODEV; goto err_free_mem; } - for (i = 1; i < VT8500_NR_PWMS; i++) - pwms[i].regbase = pwms[0].regbase; - - for (i = 0; i < VT8500_NR_PWMS; i++) - __add_pwm(&pwms[i]); + ret = pwmchip_add(&chip->chip); + if (ret < 0) + goto err_unmap; - platform_set_drvdata(pdev, pwms); - return 0; + platform_set_drvdata(pdev, chip); + return ret; +err_unmap: + iounmap(chip->base); err_free_mem: release_mem_region(r->start, resource_size(r)); err_free: - kfree(pwms); + kfree(chip); return ret; } static int __devexit pwm_remove(struct platform_device *pdev) { - struct pwm_device *pwms; + struct vt8500_chip *chip; struct resource *r; - int i; + int err; - pwms = platform_get_drvdata(pdev); - if (pwms == NULL) + chip = platform_get_drvdata(pdev); + if (chip == NULL) return -ENODEV; - mutex_lock(&pwm_lock); - - for (i = 0; i < VT8500_NR_PWMS; i++) - list_del(&pwms[i].node); - mutex_unlock(&pwm_lock); + err = pwmchip_remove(&chip->chip); + if (err < 0) + return err; - iounmap(pwms[0].regbase); + iounmap(chip->base); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(r->start, resource_size(r)); - kfree(pwms); + kfree(chip); return 0; } |