[PATCH v2 01/10] PWMSS: Add PWM Subsystem driver for parent<->child relationship
Philip, Avinash
avinashphilip at ti.com
Thu Nov 8 02:53:08 EST 2012
In some platforms (like am33xx), PWM sub modules (ECAP, EHRPWM, EQEP)
are integrated to PWM subsystem. These PWM submodules has resources
shared and only one register bit-field is provided to control
module/clock enable/disable, makes it difficult to handle common
resources from independent PWMSS submodule drivers.
So the solution here implemented in this patch is, to create driver for
PWMSS and take the role of parent driver for PWM submodules. PWMSS
parent driver enumerates all the child nodes under PWMSS module. Also
symbol "pwmss_submodule_state_change" exported to enable clock gating
for individual PWMSS submodules, and submodule drivers has to enable
clock gating from their drivers.
As this is only supported during DT boot, the parent<->child relationship
is created and populated in DT execution flow. The only required change
is inside DTS file, making EHRPWM & ECAP as a child to PWMSS node.
Signed-off-by: Philip, Avinash <avinashphilip at ti.com>
---
Changes since v1:
- Add conditional check for PWM susbsystem clock enabling.
- Add context save/restore for PWM subsystem clock config register.
:000000 100644 0000000... b6c2814... A Documentation/devicetree/bindings/pwm/tipwmss.txt
:100644 100644 6e556c7... 384a346... M drivers/pwm/Kconfig
:100644 100644 3b3f4c9a.. 55f6fb2... M drivers/pwm/Makefile
:000000 100644 0000000... c188348... A drivers/pwm/tipwmss.c
:000000 100644 0000000... f9cb2e2... A drivers/pwm/tipwmss.h
Documentation/devicetree/bindings/pwm/tipwmss.txt | 30 +++++
drivers/pwm/Kconfig | 11 ++
drivers/pwm/Makefile | 1 +
drivers/pwm/tipwmss.c | 142 +++++++++++++++++++++
drivers/pwm/tipwmss.h | 30 +++++
5 files changed, 214 insertions(+), 0 deletions(-)
diff --git a/Documentation/devicetree/bindings/pwm/tipwmss.txt b/Documentation/devicetree/bindings/pwm/tipwmss.txt
new file mode 100644
index 0000000..b6c2814
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/tipwmss.txt
@@ -0,0 +1,30 @@
+TI SOC based PWM Subsystem
+
+Required properties:
+- compatible: Must be "ti,am33xx-pwmss";
+- reg: physical base address and size of the registers map. For am33xx,
+ 4 set of register maps present, PWMSS config space, ECAP register space,
+ EQEP register space, EHRPWM register space.
+- address-cells: Specify the number of u32 entries needed in child nodes.
+ Should set to 1.
+- size-cells: specify inumber of u32 entries needed to specify child nodes size
+ in reg property. Should set to 1.
+- ranges: describes the address mapping of a memory-mapped bus. Should set to empty
+ as parent and child address space is identical.
+
+Also child nodes should also populated under PWMSS DT node.
+Example:
+pwmss0: pwmss at 48300000 {
+ compatible = "ti,am33xx-pwmss";
+ reg = <0x48300000 0x10
+ 0x48300100 0x80
+ 0x48300180 0x80
+ 0x48300200 0x80>;
+ ti,hwmods = "epwmss0";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ status = "disabled";
+ ranges;
+
+ /* child nodes go here */
+};
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 6e556c7..384a346 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -136,6 +136,7 @@ config PWM_TEGRA
config PWM_TIECAP
tristate "ECAP PWM support"
depends on SOC_AM33XX
+ select PWM_TIPWMSS
help
PWM driver support for the ECAP APWM controller found on AM33XX
TI SOC
@@ -146,6 +147,7 @@ config PWM_TIECAP
config PWM_TIEHRPWM
tristate "EHRPWM PWM support"
depends on SOC_AM33XX
+ select PWM_TIPWMSS
help
PWM driver support for the EHRPWM controller found on AM33XX
TI SOC
@@ -153,6 +155,15 @@ config PWM_TIEHRPWM
To compile this driver as a module, choose M here: the module
will be called pwm-tiehrpwm.
+config PWM_TIPWMSS
+ tristate "TI PWM Subsytem parent support"
+ depends on SOC_AM33XX && (PWM_TIEHRPWM || PWM_TIECAP)
+ help
+ PWM Subsystem driver support for AM33xx SOC.
+
+ PWM submodules require PWM config space access from submodule
+ drivers and require common parent driver support.
+
config PWM_TWL6030
tristate "TWL6030 PWM support"
depends on TWL4030_CORE
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 3b3f4c9..55f6fb2 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -12,5 +12,6 @@ obj-$(CONFIG_PWM_SPEAR) += pwm-spear.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o
obj-$(CONFIG_PWM_TIEHRPWM) += pwm-tiehrpwm.o
+obj-$(CONFIG_PWM_TIPWMSS) += tipwmss.o
obj-$(CONFIG_PWM_TWL6030) += pwm-twl6030.o
obj-$(CONFIG_PWM_VT8500) += pwm-vt8500.o
diff --git a/drivers/pwm/tipwmss.c b/drivers/pwm/tipwmss.c
new file mode 100644
index 0000000..c188348
--- /dev/null
+++ b/drivers/pwm/tipwmss.c
@@ -0,0 +1,142 @@
+/*
+ * TI PWM Subsystem driver
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of_device.h>
+
+#include "tipwmss.h"
+
+#define PWMSS_CLKCONFIG 0x8 /* Clock gaitng reg, for PWM submodules */
+#define PWMSS_CLKSTATUS 0xc /* Clock gating status reg */
+
+struct pwmss_info {
+ void __iomem *mmio_base;
+ struct mutex pwmss_lock;
+ u16 pwmss_clkconfig;
+};
+
+u16 pwmss_submodule_state_change(struct device *dev, int set)
+{
+ struct pwmss_info *info = dev_get_drvdata(dev);
+ u16 val;
+
+ val = readw(info->mmio_base + PWMSS_CLKCONFIG);
+ val |= set;
+ mutex_lock(&info->pwmss_lock);
+ writew(val , info->mmio_base + PWMSS_CLKCONFIG);
+ mutex_unlock(&info->pwmss_lock);
+ return readw(info->mmio_base + PWMSS_CLKSTATUS);
+}
+EXPORT_SYMBOL(pwmss_submodule_state_change);
+
+static const struct of_device_id pwmss_of_match[] = {
+ {
+ .compatible = "ti,am33xx-pwmss",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pwmss_of_match);
+
+static int __devinit pwmss_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct resource *r;
+ struct pwmss_info *info;
+ struct device_node *node = pdev->dev.of_node;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ mutex_init(&info->pwmss_lock);
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r) {
+ dev_err(&pdev->dev, "no memory resource defined\n");
+ return -ENODEV;
+ }
+
+ info->mmio_base = devm_request_and_ioremap(&pdev->dev, r);
+ if (!info->mmio_base)
+ return -EADDRNOTAVAIL;
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+ platform_set_drvdata(pdev, info);
+
+ /* Populate all the child nodes here... */
+ ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
+ if (ret)
+ dev_warn(&pdev->dev, "Doesn't have any child node\n");
+
+ return ret;
+}
+
+static int __devexit pwmss_remove(struct platform_device *pdev)
+{
+ struct pwmss_info *info = platform_get_drvdata(pdev);
+
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ mutex_destroy(&info->pwmss_lock);
+ return 0;
+}
+
+static int pwmss_suspend(struct device *dev)
+{
+ struct pwmss_info *info = dev_get_drvdata(dev);
+
+ info->pwmss_clkconfig = readw(info->mmio_base + PWMSS_CLKCONFIG);
+ pm_runtime_put_sync(dev);
+ return 0;
+}
+
+static int pwmss_resume(struct device *dev)
+{
+ struct pwmss_info *info = dev_get_drvdata(dev);
+
+ pm_runtime_get_sync(dev);
+ writew(info->pwmss_clkconfig, info->mmio_base + PWMSS_CLKCONFIG);
+ return 0;
+}
+
+static const struct dev_pm_ops pwmss_pm_ops = {
+ .suspend = pwmss_suspend,
+ .resume = pwmss_resume,
+};
+
+static struct platform_driver pwmss_driver = {
+ .driver = {
+ .name = "pwmss",
+ .owner = THIS_MODULE,
+ .pm = &pwmss_pm_ops,
+ .of_match_table = of_match_ptr(pwmss_of_match),
+ },
+ .probe = pwmss_probe,
+ .remove = __devexit_p(pwmss_remove),
+};
+
+module_platform_driver(pwmss_driver);
+
+MODULE_DESCRIPTION("pwmss driver");
+MODULE_AUTHOR("Texas Instruments");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pwm/tipwmss.h b/drivers/pwm/tipwmss.h
new file mode 100644
index 0000000..f9cb2e2
--- /dev/null
+++ b/drivers/pwm/tipwmss.h
@@ -0,0 +1,30 @@
+/*
+ * TI PWM Subsystem driver
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __TIPWMSS_H
+#define __TIPWMSS_H
+
+#ifdef CONFIG_PWM_TIPWMSS
+extern u16 pwmss_submodule_state_change(struct device *dev, int set);
+#else
+static inline u16 pwmss_submodule_state_change(struct device *dev, int set)
+{
+ /* return success status value */
+ return 0xFFFF;
+}
+#endif
+#endif /* __TIPWMSS_H */
--
1.7.0.4
More information about the linux-arm-kernel
mailing list