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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-10 20:15:24 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-10 20:15:24 +0900
commit2474542f64432398f503373f53bdf620491bcfa8 (patch)
tree3c9744b138c2158757530814b35c23eed31cf6ce /arch/unicore32
parentc7a6ced9d8e8411bdafe83998474d185a79badc3 (diff)
parent85f8879ca4f3d26a7f473522101fb74a79bda3f2 (diff)
downloadvexpress-lsk-2474542f64432398f503373f53bdf620491bcfa8.tar.gz
Merge tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm
Pull pwm changes from Thierry Reding: "All legacy PWM providers have now been moved to the PWM subsystem. The plan for 3.8 is to adapt all board files to provide a lookup table for PWM devices in order to get rid of the global namespace. Subsequently, users of the legacy pwm_request() and pwm_free() functions can be migrated to the new pwm_get() and pwm_put() functions. Once this has been completed, the legacy API and the compatibility code in the core can be removed. In addition to the above, these changes also add support for configuring the polarity of a PWM signal (currently only supported on ECAP and EHRPWM) and include a much needed rework of the i.MX driver. Managed functions to obtain and release a PWM device (devm_pwm_get() and devm_pwm_put()) have been added and the pwm-backlight driver has been updated to use them. If the PWM subsystem hasn't been enabled, dummy functions are provided that allow the subsystem to safely compile out. Some common checks on input parameters have been moved to the core and removed from the drivers. Finally, a small fix corrects the description of the PWM specifier's second cell in the device tree representation." * tag 'for-3.7-rc1' of git://gitorious.org/linux-pwm/linux-pwm: (23 commits) pwm: dt: Fix description of second PWM cell pwm: Check for negative duty-cycle and period pwm: Add Ingenic JZ4740 support MIPS: JZ4740: Export timer API pwm: Move PUV3 PWM driver to PWM framework unicore32: pwm: Use managed resource allocations unicore32: pwm: Remove unnecessary indirection unicore32: pwm: Use module_platform_driver() unicore32: pwm: Properly remap memory-mapped registers pwm-backlight: Use devm_pwm_get() instead of pwm_get() pwm: Move AB8500 PWM driver to PWM framework pwm: Fix compilation error when CONFIG_PWM is not defined pwm: i.MX: fix clock lookup pwm: i.MX: use per clock unconditionally pwm: i.MX: add devicetree support pwm: i.MX: Use module_platform_driver pwm: i.MX: add functions to enable/disable pwm. pwm: i.MX: remove unnecessary if in pwm_[en|dis]able pwm: i.MX: factor out SoC specific functions pwm: pwm-tiehrpwm: Add support for configuring polarity of PWM ...
Diffstat (limited to 'arch/unicore32')
-rw-r--r--arch/unicore32/Kconfig12
-rw-r--r--arch/unicore32/include/mach/regs-ost.h18
-rw-r--r--arch/unicore32/kernel/Makefile1
-rw-r--r--arch/unicore32/kernel/pwm.c263
4 files changed, 10 insertions, 284 deletions
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 1e638e75a6b..35ee2bf6635 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -21,9 +21,6 @@ config UNICORE32
designs licensed by PKUnity Ltd.
Please see web page at <http://www.pkunity.com/>.
-config HAVE_PWM
- bool
-
config GENERIC_GPIO
def_bool y
@@ -106,7 +103,8 @@ config PUV3_DB0913
config PUV3_NB0916
bool "NetBook board (0916)"
- select HAVE_PWM
+ select PWM
+ select PWM_PUV3
config PUV3_SMW0919
bool "Security Mini-Workstation board (0919)"
@@ -220,12 +218,6 @@ config PUV3_GPIO
select GPIO_SYSFS if EXPERIMENTAL
default y
-config PUV3_PWM
- tristate
- default BACKLIGHT_PWM
- help
- Enable support for NB0916 PWM controllers
-
if PUV3_NB0916
menu "PKUnity NetBook-0916 Features"
diff --git a/arch/unicore32/include/mach/regs-ost.h b/arch/unicore32/include/mach/regs-ost.h
index 7b91fe698ee..4a85fb46384 100644
--- a/arch/unicore32/include/mach/regs-ost.h
+++ b/arch/unicore32/include/mach/regs-ost.h
@@ -33,18 +33,16 @@
* Interrupt Enable Reg OST_OIER
*/
#define OST_OIER (PKUNITY_OST_BASE + 0x001C)
+
/*
- * PWM Pulse Width Control Reg OST_PWMPWCR
- */
-#define OST_PWMPWCR (PKUNITY_OST_BASE + 0x0080)
-/*
- * PWM Duty Cycle Control Reg OST_PWMDCCR
- */
-#define OST_PWMDCCR (PKUNITY_OST_BASE + 0x0084)
-/*
- * PWM Period Control Reg OST_PWMPCR
+ * PWM Registers: IO base address: PKUNITY_OST_BASE + 0x80
+ * PWCR: Pulse Width Control Reg
+ * DCCR: Duty Cycle Control Reg
+ * PCR: Period Control Reg
*/
-#define OST_PWMPCR (PKUNITY_OST_BASE + 0x0088)
+#define OST_PWM_PWCR (0x00)
+#define OST_PWM_DCCR (0x04)
+#define OST_PWM_PCR (0x08)
/*
* Match detected 0 OST_OSSR_M0
diff --git a/arch/unicore32/kernel/Makefile b/arch/unicore32/kernel/Makefile
index 32401015695..fa497e0efe5 100644
--- a/arch/unicore32/kernel/Makefile
+++ b/arch/unicore32/kernel/Makefile
@@ -16,7 +16,6 @@ obj-$(CONFIG_UNICORE_FPU_F64) += fpu-ucf64.o
obj-$(CONFIG_ARCH_PUV3) += clock.o irq.o time.o
obj-$(CONFIG_PUV3_GPIO) += gpio.o
-obj-$(CONFIG_PUV3_PWM) += pwm.o
obj-$(CONFIG_PUV3_PM) += pm.o sleep.o
obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o
diff --git a/arch/unicore32/kernel/pwm.c b/arch/unicore32/kernel/pwm.c
deleted file mode 100644
index 4615d51e3ba..00000000000
--- a/arch/unicore32/kernel/pwm.c
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
- * linux/arch/unicore32/kernel/pwm.c
- *
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
- * Copyright (C) 2001-2010 Guan Xuetao
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/pwm.h>
-
-#include <asm/div64.h>
-#include <mach/hardware.h>
-
-struct pwm_device {
- struct list_head node;
- struct platform_device *pdev;
-
- const char *label;
- struct clk *clk;
- int clk_enabled;
-
- unsigned int use_count;
- unsigned int pwm_id;
-};
-
-/*
- * period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE
- * duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
- */
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
-{
- unsigned long long c;
- unsigned long period_cycles, prescale, pv, dc;
-
- if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
- return -EINVAL;
-
- c = clk_get_rate(pwm->clk);
- c = c * period_ns;
- do_div(c, 1000000000);
- period_cycles = c;
-
- if (period_cycles < 1)
- period_cycles = 1;
- prescale = (period_cycles - 1) / 1024;
- pv = period_cycles / (prescale + 1) - 1;
-
- if (prescale > 63)
- return -EINVAL;
-
- if (duty_ns == period_ns)
- dc = OST_PWMDCCR_FDCYCLE;
- else
- dc = (pv + 1) * duty_ns / period_ns;
-
- /* NOTE: the clock to PWM has to be enabled first
- * before writing to the registers
- */
- clk_enable(pwm->clk);
- OST_PWMPWCR = prescale;
- OST_PWMDCCR = pv - dc;
- OST_PWMPCR = pv;
- clk_disable(pwm->clk);
-
- return 0;
-}
-EXPORT_SYMBOL(pwm_config);
-
-int pwm_enable(struct pwm_device *pwm)
-{
- int rc = 0;
-
- if (!pwm->clk_enabled) {
- rc = clk_enable(pwm->clk);
- if (!rc)
- pwm->clk_enabled = 1;
- }
- return rc;
-}
-EXPORT_SYMBOL(pwm_enable);
-
-void pwm_disable(struct pwm_device *pwm)
-{
- if (pwm->clk_enabled) {
- clk_disable(pwm->clk);
- pwm->clk_enabled = 0;
- }
-}
-EXPORT_SYMBOL(pwm_disable);
-
-static DEFINE_MUTEX(pwm_lock);
-static LIST_HEAD(pwm_list);
-
-struct pwm_device *pwm_request(int pwm_id, const char *label)
-{
- struct pwm_device *pwm;
- int found = 0;
-
- mutex_lock(&pwm_lock);
-
- 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;
-}
-EXPORT_SYMBOL(pwm_request);
-
-void pwm_free(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");
-
- mutex_unlock(&pwm_lock);
-}
-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_device *pwm_probe(struct platform_device *pdev,
- unsigned int pwm_id, struct pwm_device *parent_pwm)
-{
- struct pwm_device *pwm;
- struct resource *r;
- int ret = 0;
-
- pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
- if (pwm == NULL) {
- dev_err(&pdev->dev, "failed to allocate memory\n");
- return ERR_PTR(-ENOMEM);
- }
-
- pwm->clk = clk_get(NULL, "OST_CLK");
- if (IS_ERR(pwm->clk)) {
- ret = PTR_ERR(pwm->clk);
- goto err_free;
- }
- pwm->clk_enabled = 0;
-
- pwm->use_count = 0;
- pwm->pwm_id = pwm_id;
- pwm->pdev = pdev;
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (r == NULL) {
- dev_err(&pdev->dev, "no memory resource defined\n");
- ret = -ENODEV;
- goto err_free_clk;
- }
-
- r = request_mem_region(r->start, resource_size(r), pdev->name);
- if (r == NULL) {
- dev_err(&pdev->dev, "failed to request memory resource\n");
- ret = -EBUSY;
- goto err_free_clk;
- }
-
- __add_pwm(pwm);
- platform_set_drvdata(pdev, pwm);
- return pwm;
-
-err_free_clk:
- clk_put(pwm->clk);
-err_free:
- kfree(pwm);
- return ERR_PTR(ret);
-}
-
-static int __devinit puv3_pwm_probe(struct platform_device *pdev)
-{
- struct pwm_device *pwm = pwm_probe(pdev, pdev->id, NULL);
-
- if (IS_ERR(pwm))
- return PTR_ERR(pwm);
-
- return 0;
-}
-
-static int __devexit pwm_remove(struct platform_device *pdev)
-{
- struct pwm_device *pwm;
- struct resource *r;
-
- pwm = platform_get_drvdata(pdev);
- if (pwm == NULL)
- return -ENODEV;
-
- mutex_lock(&pwm_lock);
- list_del(&pwm->node);
- mutex_unlock(&pwm_lock);
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(r->start, resource_size(r));
-
- clk_put(pwm->clk);
- kfree(pwm);
- return 0;
-}
-
-static struct platform_driver puv3_pwm_driver = {
- .driver = {
- .name = "PKUnity-v3-PWM",
- },
- .probe = puv3_pwm_probe,
- .remove = __devexit_p(pwm_remove),
-};
-
-static int __init pwm_init(void)
-{
- int ret = 0;
-
- ret = platform_driver_register(&puv3_pwm_driver);
- if (ret) {
- printk(KERN_ERR "failed to register puv3_pwm_driver\n");
- return ret;
- }
-
- return ret;
-}
-arch_initcall(pwm_init);
-
-static void __exit pwm_exit(void)
-{
- platform_driver_unregister(&puv3_pwm_driver);
-}
-module_exit(pwm_exit);
-
-MODULE_LICENSE("GPL v2");