Add the gdium platform devices such as lm75 sensor and m41t83 rtc.
Signed-off-by: yajin <yajin@xxxxxxxxxxxxx>
---
arch/mips/loongson/Kconfig | 4 +
arch/mips/loongson/gdium/Makefile | 2 +-
arch/mips/loongson/gdium/platform.c | 133 ++++++++++
arch/mips/loongson/gdium/pwm-clock.c | 465 ++++++++++++++++++++++++++++++++++
4 files changed, 603 insertions(+), 1 deletions(-)
create mode 100644 arch/mips/loongson/gdium/platform.c
create mode 100644 arch/mips/loongson/gdium/pwm-clock.c
diff --git a/arch/mips/loongson/Kconfig b/arch/mips/loongson/Kconfig
index 90a02b4..c264a84 100644
--- a/arch/mips/loongson/Kconfig
+++ b/arch/mips/loongson/Kconfig
@@ -80,10 +80,14 @@ config DEXXON_GDIUM
select SYS_SUPPORTS_HIGHMEM
select SYS_SUPPORTS_LITTLE_ENDIAN
select ARCH_REQUIRE_GPIOLIB
+ select HAVE_PWM if MFD_SM501
help
Dexxon gdium netbook based on Loongson 2F and SM502.
endchoice
+config HAVE_PWM
+ bool
+
config CS5536
bool
diff --git a/arch/mips/loongson/gdium/Makefile
b/arch/mips/loongson/gdium/Makefile
index 31a8e57..4fb096d 100644
--- a/arch/mips/loongson/gdium/Makefile
+++ b/arch/mips/loongson/gdium/Makefile
@@ -1,3 +1,3 @@
# Makefile for gdium
-obj-y += irq.o reset.o
+obj-y += irq.o reset.o platform.o pwm-clock.o
diff --git a/arch/mips/loongson/gdium/platform.c
b/arch/mips/loongson/gdium/platform.c
new file mode 100644
index 0000000..a6d5968
--- /dev/null
+++ b/arch/mips/loongson/gdium/platform.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2009 Philippe Vachon <philippe@xxxxxxxxx>
+ *
+ * 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 <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/pwm_backlight.h>
+#include <linux/i2c.h>
+#include <linux/i2c-gpio.h>
+
+#include <loongson.h>
+
+#define GDIUM_GPIO_BASE 224
+
+static struct i2c_board_info __initdata sm502dev_i2c_devices[] = {
+ {
+ I2C_BOARD_INFO("lm75", 0x48),
+ .type = "lm75",
+ },
+ {
+ I2C_BOARD_INFO("rtc-m41t80", 0x68),
+ .type = "m41t83",
+ },
+ {
+ I2C_BOARD_INFO("gdium-laptop", 0x40),
+ },
+};
+
+static int sm502dev_backlight_init(struct device *dev)
+{
+ /* Add gpio request stuff here */
+ return 0;
+}
+
+static void sm502dev_backlight_exit(struct device *dev)
+{
+ /* Add gpio free stuff here */
+}
+
+static struct platform_pwm_backlight_data backlight_data = {
+ .pwm_id = 0,
+ .max_brightness = 100,
+ .dft_brightness = 50,
+ .pwm_period_ns = 50000, /* 20 kHz */
+ .init = sm502dev_backlight_init,
+ .exit = sm502dev_backlight_exit,
+};
+
+static struct platform_device backlight = {
+ .name = "pwm-backlight",
+ .dev = {
+ .platform_data = &backlight_data,
+ },
+ .id = -1,
+};
+
+/*
+ * Warning this stunt is very dangerous
+ * as the sm501 gpio have dynamic numbers...
+ */
+/* bus 0 is the one for the ST7, DS75 etc... */
+static struct i2c_gpio_platform_data i2c_gpio0_data = {
+ .sda_pin = GDIUM_GPIO_BASE + 13,
+ .scl_pin = GDIUM_GPIO_BASE + 6,
+ .udelay = 5,
+ .timeout = HZ / 10,
+ .sda_is_open_drain = 0,
+ .scl_is_open_drain = 0,
+};
+
+static struct platform_device i2c_gpio0_device = {
+ .name = "i2c-gpio",
+ .id = 0,
+ .dev = {
+ .platform_data = &i2c_gpio0_data,
+ },
+};
+
+/* bus 1 is for the CRT/VGA external screen */
+static struct i2c_gpio_platform_data i2c_gpio1_data = {
+ .sda_pin = GDIUM_GPIO_BASE + 10,
+ .scl_pin = GDIUM_GPIO_BASE + 9,
+ .udelay = 5,
+ .timeout = HZ / 10,
+ .sda_is_open_drain = 0,
+ .scl_is_open_drain = 0,
+};
+
+static struct platform_device i2c_gpio1_device = {
+ .name = "i2c-gpio",
+ .id = 1,
+ .dev = {
+ .platform_data = &i2c_gpio1_data,
+ },
+};
+
+static struct platform_device *devices[] __initdata = {
+ &i2c_gpio0_device,
+ &i2c_gpio1_device,
+ &backlight,
+};
+
+static int __init gdium_platform_devices_setup(void)
+{
+ int ret;
+ printk(KERN_INFO "Registering gdium platform devices\n");
+
+ platform_add_devices(devices, ARRAY_SIZE(devices));
+
+ ret = i2c_register_board_info(0, sm502dev_i2c_devices,
+ ARRAY_SIZE(sm502dev_i2c_devices));
+
+ if (ret != 0) {
+ printk(KERN_INFO "Error while registering gdium platform"
+ " devices: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * some devices are on the pwm stuff which is behind the mfd which is
+ * behind the pci bus so arch_initcall can't work because too early
+ */
+late_initcall(gdium_platform_devices_setup);
diff --git a/arch/mips/loongson/gdium/pwm-clock.c
b/arch/mips/loongson/gdium/pwm-clock.c
new file mode 100644
index 0000000..5af3b23
--- /dev/null
+++ b/arch/mips/loongson/gdium/pwm-clock.c
@@ -0,0 +1,465 @@
+/*
+ * SM501 PWM clock
+ * Copyright (C) 2009-2010 Arnaud Patard <apatard@xxxxxxxxxxxx>
+ *
+ * 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 <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pwm.h>
+#include <linux/sm501.h>
+#include <linux/sm501-regs.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static const char drv_name[] = "sm501-pwm";
+
+#define INPUT_CLOCK 96 /* MHz */
+#define PWM_COUNT 3
+
+#define SM501PWM_HIGH_COUNTER (1<<20)
+#define SM501PWM_LOW_COUNTER (1<<8)
+#define SM501PWM_CLOCK_DIVIDE (1>>4)
+#define SM501PWM_IP (1<<3)
+#define SM501PWM_I (1<<2)
+#define SM501PWM_E (1<<0)
+
+struct pwm_device {
+ struct list_head node;
+ struct device *dev;
+ void __iomem *regs;
+ int duty_ns;
+ int period_ns;
+ char enabled;
+ void (*handler)(struct pwm_device *pwm);
+
+ const char *label;
+ unsigned int use_count;
+ unsigned int pwm_id;
+};
+
+struct sm501pwm_info {
+ void __iomem *regs;
+ int irq;
+ struct resource *res;
+ struct device *dev;
+ struct dentry *debugfs;
+
+ struct pwm_device pwm[3];
+};
+
+int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ unsigned int high, low, divider;
+ int divider1, divider2;
+ unsigned long long delay;
+
+ if (!pwm || !pwm->regs || period_ns == 0 || duty_ns > period_ns)
+ return -EINVAL;
+
+ /* Get delay
+ * We're loosing some precision but multiplying then dividing
+ * will overflow
+ */
+ if (period_ns > 1000) {
+ delay = period_ns / 1000;
+ delay *= INPUT_CLOCK;
+ } else {
+ delay = period_ns * 96;
+ delay /= 1000;
+ }
+
+ /* Get the number of clock low and high */
+ high = delay * duty_ns / period_ns;
+ low = delay - high;
+
+ /* Get divider to make 'low' and 'high' fit into 12 bits */
+ /* No need to say that the divider must be >= 0 */
+ divider1 = fls(low)-12;
+ divider2 = fls(high)-12;
+
+ if (divider1 < 0)
+ divider1 = 0;
+ if (divider2 < 0)
+ divider2 = 0;
+
+ divider = max(divider1, divider2);
+
+ low >>= divider;
+ high >>= divider;
+
+ pwm->duty_ns = duty_ns;
+ pwm->period_ns = period_ns;
+
+ writel((high<<20)|(low<<8)|(divider<<4), pwm->regs);
+ return 0;
+}
+EXPORT_SYMBOL(pwm_config);
+
+int pwm_enable(struct pwm_device *pwm)
+{
+ u32 reg;
+
+ if (!pwm)
+ return -EINVAL;
+
+ switch (pwm->pwm_id) {
+ case 0:
+ sm501_configure_gpio(pwm->dev->parent, 29, 1);
+ break;
+ case 1:
+ sm501_configure_gpio(pwm->dev->parent, 30, 1);
+ break;
+ case 2:
+ sm501_configure_gpio(pwm->dev->parent, 31, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ reg = readl(pwm->regs);
+ reg |= (SM501PWM_IP | SM501PWM_E);
+ writel(reg, pwm->regs);
+ pwm->enabled = 1;
+
+ return 0;
+}
+EXPORT_SYMBOL(pwm_enable);
+
+void pwm_disable(struct pwm_device *pwm)
+{
+ u32 reg;
+
+ if (!pwm)
+ return;
+
+ reg = readl(pwm->regs);
+ reg &= ~(SM501PWM_IP | SM501PWM_E);
+ writel(reg, pwm->regs);
+
+ switch (pwm->pwm_id) {
+ case 0:
+ sm501_configure_gpio(pwm->dev->parent, 29, 0);
+ break;
+ case 1:
+ sm501_configure_gpio(pwm->dev->parent, 30, 0);
+ break;
+ case 2:
+ sm501_configure_gpio(pwm->dev->parent, 31, 0);
+ break;
+ default:
+ break;
+ }
+ pwm->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 && pwm->use_count == 0) {
+ pwm->use_count++;
+ pwm->label = label;
+ found = 1;
+ break;
+ }
+ }
+
+ mutex_unlock(&pwm_lock);
+
+ return (found) ? pwm : NULL;
+}
+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
+ dev_warn(pwm->dev, "PWM device already freed\n");
+
+ mutex_unlock(&pwm_lock);
+}
+EXPORT_SYMBOL(pwm_free);
+
+int pwm_int_enable(struct pwm_device *pwm)
+{
+ unsigned long conf;
+
+ if (!pwm || !pwm->regs || !pwm->handler)
+ return -EINVAL;
+
+ conf = readl(pwm->regs);
+ conf |= SM501PWM_I;
+ writel(conf, pwm->regs);
+ return 0;
+}
+EXPORT_SYMBOL(pwm_int_enable);
+
+int pwm_int_disable(struct pwm_device *pwm)
+{
+ unsigned long conf;
+
+ if (!pwm || !pwm->regs || !pwm->handler)
+ return -EINVAL;
+
+ conf = readl(pwm->regs);
+ conf &= ~SM501PWM_I;
+ writel(conf, pwm->regs);
+ return 0;
+}
+EXPORT_SYMBOL(pwm_int_disable);
+
+int pwm_set_handler(struct pwm_device *pwm,
+ void (*handler)(struct pwm_device *pwm))
+{
+ if (!pwm || !handler)
+ return -EINVAL;
+ pwm->handler = handler;
+ return 0;
+}
+EXPORT_SYMBOL(pwm_set_handler);
+
+static irqreturn_t sm501pwm_irq(int irq, void *dev_id)
+{
+ unsigned long value;
+ struct sm501pwm_info *info = (struct sm501pwm_info *)dev_id;
+ struct pwm_device *pwm;
+ int i;
+
+ value = sm501_modify_reg(info->dev->parent, SM501_IRQ_STATUS, 0, 0);
+
+ /* Check is the interrupt is for us */
+ if (value & (1<<22)) {
+ for (i = 0 ; i < PWM_COUNT ; i++) {
+ /*
+ * Find which pwm triggered the interrupt
+ * and ack
+ */
+ value = readl(info->regs + i*4);
+ if (value & SM501PWM_IP)
+ writel(value | SM501PWM_IP, info->regs + i*4);
+
+ pwm = &info->pwm[i];
+ if (pwm->handler)
+ pwm->handler(pwm);
+ }
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static void add_pwm(int id, struct sm501pwm_info *info)
+{
+ struct pwm_device *pwm = &info->pwm[id];
+
+ pwm->use_count = 0;
+ pwm->pwm_id = id;
+ pwm->dev = info->dev;
+ pwm->regs = info->regs + id * 4;
+
+ mutex_lock(&pwm_lock);
+ list_add_tail(&pwm->node, &pwm_list);
+ mutex_unlock(&pwm_lock);
+}
+
+static void del_pwm(int id, struct sm501pwm_info *info)
+{
+ struct pwm_device *pwm = &info->pwm[id];
+
+ pwm->use_count = 0;
+ pwm->pwm_id = -1;
+ mutex_lock(&pwm_lock);
+ list_del(&pwm->node);
+ mutex_unlock(&pwm_lock);
+}
+
+/* Debug fs */
+static int sm501pwm_show(struct seq_file *s, void *p)
+{
+ struct pwm_device *pwm;
+
+ mutex_lock(&pwm_lock);
+ list_for_each_entry(pwm, &pwm_list, node) {
+ if (pwm->use_count) {
+ seq_printf(s, "pwm-%d (%12s) %d %d %s\n",
+ pwm->pwm_id, pwm->label,
+ pwm->duty_ns, pwm->period_ns,
+ pwm->enabled ? "on" : "off");
+ seq_printf(s, " %08x\n", readl(pwm->regs));
+ }
+ }
+ mutex_unlock(&pwm_lock);
+
+ return 0;
+}
+
+static int sm501pwm_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, sm501pwm_show, inode->i_private);
+}
+
+static const struct file_operations sm501pwm_fops = {
+ .open = sm501pwm_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
+static int __init sm501pwm_probe(struct platform_device *pdev)
+{
+ struct sm501pwm_info *info;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int ret = 0;
+ int res_len;
+ int i;
+
+ info = kzalloc(sizeof(struct sm501pwm_info), GFP_KERNEL);
+ if (!info) {
+ dev_err(dev, "Allocation failure\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+ info->dev = dev;
+ platform_set_drvdata(pdev, info);
+
+ /* Get irq number */
+ info->irq = platform_get_irq(pdev, 0);
+ if (!info->irq) {
+ dev_err(dev, "no irq found\n");
+ ret = -ENODEV;
+ goto err_alloc;
+ }
+
+ /* Get regs address */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(dev, "No memory resource found\n");
+ ret = -ENODEV;
+ goto err_alloc;
+ }
+ info->res = res;
+ res_len = (res->end - res->start)+1;
+
+ if (!request_mem_region(res->start, res_len, drv_name)) {
+ dev_err(dev, "Can't request iomem resource\n");
+ ret = -EBUSY;
+ goto err_alloc;
+ }
+
+ info->regs = ioremap(res->start, res_len);
+ if (!info->regs) {
+ dev_err(dev, "ioremap failed\n");
+ ret = -ENOMEM;
+ goto err_mem;
+ }
+
+ ret = request_irq(info->irq, sm501pwm_irq, IRQF_SHARED, drv_name, info);
+ if (ret != 0) {
+ dev_err(dev, "can't get irq\n");
+ goto err_map;
+ }
+
+
+ sm501_unit_power(info->dev->parent, SM501_GATE_GPIO, 1);
+
+ for (i = 0; i < 3; i++)
+ add_pwm(i, info);
+
+ dev_info(dev, "SM501 PWM Found at %lx irq %d\n",
+ (unsigned long)info->res->start, info->irq);
+
+ info->debugfs = debugfs_create_file("pwm", S_IFREG | S_IRUGO,
+ NULL, info, &sm501pwm_fops);
+
+
+ return 0;
+
+err_map:
+ iounmap(info->regs);
+
+err_mem:
+ release_mem_region(res->start, res_len);
+
+err_alloc:
+ kfree(info);
+ platform_set_drvdata(pdev, NULL);
+err:
+ return ret;
+}
+
+static int sm501pwm_remove(struct platform_device *pdev)
+{
+ struct sm501pwm_info *info = platform_get_drvdata(pdev);
+ int i;
+
+ if (info->debugfs)
+ debugfs_remove(info->debugfs);
+
+ for (i = 0; i < 3; i++) {
+ pwm_disable(&info->pwm[i]);
+ del_pwm(i, info);
+ }
+
+ sm501_unit_power(info->dev->parent, SM501_GATE_GPIO, 0);
+ sm501_modify_reg(info->dev->parent, SM501_IRQ_STATUS, 0, 1<<22);
+
+ free_irq(info->irq, info);
+ iounmap(info->regs);
+ release_mem_region(info->res->start,
+ (info->res->end - info->res->start)+1);
+ kfree(info);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver sm501pwm_driver = {
+ .probe = sm501pwm_probe,
+ .remove = sm501pwm_remove,
+ .driver = {
+ .name = drv_name,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __devinit sm501pwm_init(void)
+{
+ return platform_driver_register(&sm501pwm_driver);
+}
+
+static void __exit sm501pwm_cleanup(void)
+{
+ platform_driver_unregister(&sm501pwm_driver);
+}
+
+module_init(sm501pwm_init);
+module_exit(sm501pwm_cleanup);
+
+MODULE_AUTHOR("Arnaud Patard <apatard@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("SM501 PWM driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sm501-pwm");
--
1.5.6.5
