![Kukjin Kim](/assets/img/avatar_default.png)
This patch removes supporting codes for s5pc100 because no more used now. [jason@lakedaemon.net: for drivers/irqchip/Kconfig] Acked-by: Jason Cooper <jason@lakedaemon.net> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
527 lines
12 KiB
C
527 lines
12 KiB
C
/* arch/arm/plat-samsung/adc.c
|
|
*
|
|
* Copyright (c) 2008 Simtec Electronics
|
|
* http://armlinux.simtec.co.uk/
|
|
* Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
|
|
*
|
|
* Samsung ADC device core
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/regulator/consumer.h>
|
|
|
|
#include <plat/regs-adc.h>
|
|
#include <plat/adc.h>
|
|
|
|
/* This driver is designed to control the usage of the ADC block between
|
|
* the touchscreen and any other drivers that may need to use it, such as
|
|
* the hwmon driver.
|
|
*
|
|
* Priority will be given to the touchscreen driver, but as this itself is
|
|
* rate limited it should not starve other requests which are processed in
|
|
* order that they are received.
|
|
*
|
|
* Each user registers to get a client block which uniquely identifies it
|
|
* and stores information such as the necessary functions to callback when
|
|
* action is required.
|
|
*/
|
|
|
|
enum s3c_cpu_type {
|
|
TYPE_ADCV1, /* S3C24XX */
|
|
TYPE_ADCV11, /* S3C2443 */
|
|
TYPE_ADCV12, /* S3C2416, S3C2450 */
|
|
TYPE_ADCV2, /* S3C64XX */
|
|
TYPE_ADCV3, /* S5PV210, S5PC110, EXYNOS4210 */
|
|
};
|
|
|
|
struct s3c_adc_client {
|
|
struct platform_device *pdev;
|
|
struct list_head pend;
|
|
wait_queue_head_t *wait;
|
|
|
|
unsigned int nr_samples;
|
|
int result;
|
|
unsigned char is_ts;
|
|
unsigned char channel;
|
|
|
|
void (*select_cb)(struct s3c_adc_client *c, unsigned selected);
|
|
void (*convert_cb)(struct s3c_adc_client *c,
|
|
unsigned val1, unsigned val2,
|
|
unsigned *samples_left);
|
|
};
|
|
|
|
struct adc_device {
|
|
struct platform_device *pdev;
|
|
struct platform_device *owner;
|
|
struct clk *clk;
|
|
struct s3c_adc_client *cur;
|
|
struct s3c_adc_client *ts_pend;
|
|
void __iomem *regs;
|
|
spinlock_t lock;
|
|
|
|
unsigned int prescale;
|
|
|
|
int irq;
|
|
struct regulator *vdd;
|
|
};
|
|
|
|
static struct adc_device *adc_dev;
|
|
|
|
static LIST_HEAD(adc_pending); /* protected by adc_device.lock */
|
|
|
|
#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
|
|
|
|
static inline void s3c_adc_convert(struct adc_device *adc)
|
|
{
|
|
unsigned con = readl(adc->regs + S3C2410_ADCCON);
|
|
|
|
con |= S3C2410_ADCCON_ENABLE_START;
|
|
writel(con, adc->regs + S3C2410_ADCCON);
|
|
}
|
|
|
|
static inline void s3c_adc_select(struct adc_device *adc,
|
|
struct s3c_adc_client *client)
|
|
{
|
|
unsigned con = readl(adc->regs + S3C2410_ADCCON);
|
|
enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
|
|
|
|
client->select_cb(client, 1);
|
|
|
|
if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV2)
|
|
con &= ~S3C2410_ADCCON_MUXMASK;
|
|
con &= ~S3C2410_ADCCON_STDBM;
|
|
con &= ~S3C2410_ADCCON_STARTMASK;
|
|
|
|
if (!client->is_ts) {
|
|
if (cpu == TYPE_ADCV3)
|
|
writel(client->channel & 0xf, adc->regs + S5P_ADCMUX);
|
|
else if (cpu == TYPE_ADCV11 || cpu == TYPE_ADCV12)
|
|
writel(client->channel & 0xf,
|
|
adc->regs + S3C2443_ADCMUX);
|
|
else
|
|
con |= S3C2410_ADCCON_SELMUX(client->channel);
|
|
}
|
|
|
|
writel(con, adc->regs + S3C2410_ADCCON);
|
|
}
|
|
|
|
static void s3c_adc_dbgshow(struct adc_device *adc)
|
|
{
|
|
adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n",
|
|
readl(adc->regs + S3C2410_ADCCON),
|
|
readl(adc->regs + S3C2410_ADCTSC),
|
|
readl(adc->regs + S3C2410_ADCDLY));
|
|
}
|
|
|
|
static void s3c_adc_try(struct adc_device *adc)
|
|
{
|
|
struct s3c_adc_client *next = adc->ts_pend;
|
|
|
|
if (!next && !list_empty(&adc_pending)) {
|
|
next = list_first_entry(&adc_pending,
|
|
struct s3c_adc_client, pend);
|
|
list_del(&next->pend);
|
|
} else
|
|
adc->ts_pend = NULL;
|
|
|
|
if (next) {
|
|
adc_dbg(adc, "new client is %p\n", next);
|
|
adc->cur = next;
|
|
s3c_adc_select(adc, next);
|
|
s3c_adc_convert(adc);
|
|
s3c_adc_dbgshow(adc);
|
|
}
|
|
}
|
|
|
|
int s3c_adc_start(struct s3c_adc_client *client,
|
|
unsigned int channel, unsigned int nr_samples)
|
|
{
|
|
struct adc_device *adc = adc_dev;
|
|
unsigned long flags;
|
|
|
|
if (!adc) {
|
|
printk(KERN_ERR "%s: failed to find adc\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_irqsave(&adc->lock, flags);
|
|
|
|
if (client->is_ts && adc->ts_pend) {
|
|
spin_unlock_irqrestore(&adc->lock, flags);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
client->channel = channel;
|
|
client->nr_samples = nr_samples;
|
|
|
|
if (client->is_ts)
|
|
adc->ts_pend = client;
|
|
else
|
|
list_add_tail(&client->pend, &adc_pending);
|
|
|
|
if (!adc->cur)
|
|
s3c_adc_try(adc);
|
|
|
|
spin_unlock_irqrestore(&adc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(s3c_adc_start);
|
|
|
|
static void s3c_convert_done(struct s3c_adc_client *client,
|
|
unsigned v, unsigned u, unsigned *left)
|
|
{
|
|
client->result = v;
|
|
wake_up(client->wait);
|
|
}
|
|
|
|
int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch)
|
|
{
|
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
|
|
int ret;
|
|
|
|
client->convert_cb = s3c_convert_done;
|
|
client->wait = &wake;
|
|
client->result = -1;
|
|
|
|
ret = s3c_adc_start(client, ch, 1);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
ret = wait_event_timeout(wake, client->result >= 0, HZ / 2);
|
|
if (client->result < 0) {
|
|
ret = -ETIMEDOUT;
|
|
goto err;
|
|
}
|
|
|
|
client->convert_cb = NULL;
|
|
return client->result;
|
|
|
|
err:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(s3c_adc_read);
|
|
|
|
static void s3c_adc_default_select(struct s3c_adc_client *client,
|
|
unsigned select)
|
|
{
|
|
}
|
|
|
|
struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev,
|
|
void (*select)(struct s3c_adc_client *client,
|
|
unsigned int selected),
|
|
void (*conv)(struct s3c_adc_client *client,
|
|
unsigned d0, unsigned d1,
|
|
unsigned *samples_left),
|
|
unsigned int is_ts)
|
|
{
|
|
struct s3c_adc_client *client;
|
|
|
|
WARN_ON(!pdev);
|
|
|
|
if (!select)
|
|
select = s3c_adc_default_select;
|
|
|
|
if (!pdev)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
client = kzalloc(sizeof(struct s3c_adc_client), GFP_KERNEL);
|
|
if (!client) {
|
|
dev_err(&pdev->dev, "no memory for adc client\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
client->pdev = pdev;
|
|
client->is_ts = is_ts;
|
|
client->select_cb = select;
|
|
client->convert_cb = conv;
|
|
|
|
return client;
|
|
}
|
|
EXPORT_SYMBOL_GPL(s3c_adc_register);
|
|
|
|
void s3c_adc_release(struct s3c_adc_client *client)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&adc_dev->lock, flags);
|
|
|
|
/* We should really check that nothing is in progress. */
|
|
if (adc_dev->cur == client)
|
|
adc_dev->cur = NULL;
|
|
if (adc_dev->ts_pend == client)
|
|
adc_dev->ts_pend = NULL;
|
|
else {
|
|
struct list_head *p, *n;
|
|
struct s3c_adc_client *tmp;
|
|
|
|
list_for_each_safe(p, n, &adc_pending) {
|
|
tmp = list_entry(p, struct s3c_adc_client, pend);
|
|
if (tmp == client)
|
|
list_del(&tmp->pend);
|
|
}
|
|
}
|
|
|
|
if (adc_dev->cur == NULL)
|
|
s3c_adc_try(adc_dev);
|
|
|
|
spin_unlock_irqrestore(&adc_dev->lock, flags);
|
|
kfree(client);
|
|
}
|
|
EXPORT_SYMBOL_GPL(s3c_adc_release);
|
|
|
|
static irqreturn_t s3c_adc_irq(int irq, void *pw)
|
|
{
|
|
struct adc_device *adc = pw;
|
|
struct s3c_adc_client *client = adc->cur;
|
|
enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
|
|
unsigned data0, data1;
|
|
|
|
if (!client) {
|
|
dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
|
|
goto exit;
|
|
}
|
|
|
|
data0 = readl(adc->regs + S3C2410_ADCDAT0);
|
|
data1 = readl(adc->regs + S3C2410_ADCDAT1);
|
|
adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1);
|
|
|
|
client->nr_samples--;
|
|
|
|
if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV11) {
|
|
data0 &= 0x3ff;
|
|
data1 &= 0x3ff;
|
|
} else {
|
|
/* S3C2416/S3C64XX/S5P ADC resolution is 12-bit */
|
|
data0 &= 0xfff;
|
|
data1 &= 0xfff;
|
|
}
|
|
|
|
if (client->convert_cb)
|
|
(client->convert_cb)(client, data0, data1, &client->nr_samples);
|
|
|
|
if (client->nr_samples > 0) {
|
|
/* fire another conversion for this */
|
|
|
|
client->select_cb(client, 1);
|
|
s3c_adc_convert(adc);
|
|
} else {
|
|
spin_lock(&adc->lock);
|
|
(client->select_cb)(client, 0);
|
|
adc->cur = NULL;
|
|
|
|
s3c_adc_try(adc);
|
|
spin_unlock(&adc->lock);
|
|
}
|
|
|
|
exit:
|
|
if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) {
|
|
/* Clear ADC interrupt */
|
|
writel(0, adc->regs + S3C64XX_ADCCLRINT);
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int s3c_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct adc_device *adc;
|
|
struct resource *regs;
|
|
enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
|
|
int ret;
|
|
unsigned tmp;
|
|
|
|
adc = devm_kzalloc(dev, sizeof(struct adc_device), GFP_KERNEL);
|
|
if (adc == NULL) {
|
|
dev_err(dev, "failed to allocate adc_device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
spin_lock_init(&adc->lock);
|
|
|
|
adc->pdev = pdev;
|
|
adc->prescale = S3C2410_ADCCON_PRSCVL(49);
|
|
|
|
adc->vdd = devm_regulator_get(dev, "vdd");
|
|
if (IS_ERR(adc->vdd)) {
|
|
dev_err(dev, "operating without regulator \"vdd\" .\n");
|
|
return PTR_ERR(adc->vdd);
|
|
}
|
|
|
|
adc->irq = platform_get_irq(pdev, 1);
|
|
if (adc->irq <= 0) {
|
|
dev_err(dev, "failed to get adc irq\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev),
|
|
adc);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to attach adc irq\n");
|
|
return ret;
|
|
}
|
|
|
|
adc->clk = devm_clk_get(dev, "adc");
|
|
if (IS_ERR(adc->clk)) {
|
|
dev_err(dev, "failed to get adc clock\n");
|
|
return PTR_ERR(adc->clk);
|
|
}
|
|
|
|
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
adc->regs = devm_ioremap_resource(dev, regs);
|
|
if (IS_ERR(adc->regs))
|
|
return PTR_ERR(adc->regs);
|
|
|
|
ret = regulator_enable(adc->vdd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
clk_enable(adc->clk);
|
|
|
|
tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
|
|
|
|
/* Enable 12-bit ADC resolution */
|
|
if (cpu == TYPE_ADCV12)
|
|
tmp |= S3C2416_ADCCON_RESSEL;
|
|
if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3)
|
|
tmp |= S3C64XX_ADCCON_RESSEL;
|
|
|
|
writel(tmp, adc->regs + S3C2410_ADCCON);
|
|
|
|
dev_info(dev, "attached adc driver\n");
|
|
|
|
platform_set_drvdata(pdev, adc);
|
|
adc_dev = adc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct adc_device *adc = platform_get_drvdata(pdev);
|
|
|
|
clk_disable(adc->clk);
|
|
regulator_disable(adc->vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int s3c_adc_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = container_of(dev,
|
|
struct platform_device, dev);
|
|
struct adc_device *adc = platform_get_drvdata(pdev);
|
|
unsigned long flags;
|
|
u32 con;
|
|
|
|
spin_lock_irqsave(&adc->lock, flags);
|
|
|
|
con = readl(adc->regs + S3C2410_ADCCON);
|
|
con |= S3C2410_ADCCON_STDBM;
|
|
writel(con, adc->regs + S3C2410_ADCCON);
|
|
|
|
disable_irq(adc->irq);
|
|
spin_unlock_irqrestore(&adc->lock, flags);
|
|
clk_disable(adc->clk);
|
|
regulator_disable(adc->vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c_adc_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = container_of(dev,
|
|
struct platform_device, dev);
|
|
struct adc_device *adc = platform_get_drvdata(pdev);
|
|
enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data;
|
|
int ret;
|
|
unsigned long tmp;
|
|
|
|
ret = regulator_enable(adc->vdd);
|
|
if (ret)
|
|
return ret;
|
|
clk_enable(adc->clk);
|
|
enable_irq(adc->irq);
|
|
|
|
tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
|
|
|
|
/* Enable 12-bit ADC resolution */
|
|
if (cpu == TYPE_ADCV12)
|
|
tmp |= S3C2416_ADCCON_RESSEL;
|
|
if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3)
|
|
tmp |= S3C64XX_ADCCON_RESSEL;
|
|
|
|
writel(tmp, adc->regs + S3C2410_ADCCON);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
#define s3c_adc_suspend NULL
|
|
#define s3c_adc_resume NULL
|
|
#endif
|
|
|
|
static struct platform_device_id s3c_adc_driver_ids[] = {
|
|
{
|
|
.name = "s3c24xx-adc",
|
|
.driver_data = TYPE_ADCV1,
|
|
}, {
|
|
.name = "s3c2443-adc",
|
|
.driver_data = TYPE_ADCV11,
|
|
}, {
|
|
.name = "s3c2416-adc",
|
|
.driver_data = TYPE_ADCV12,
|
|
}, {
|
|
.name = "s3c64xx-adc",
|
|
.driver_data = TYPE_ADCV2,
|
|
}, {
|
|
.name = "samsung-adc-v3",
|
|
.driver_data = TYPE_ADCV3,
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids);
|
|
|
|
static const struct dev_pm_ops adc_pm_ops = {
|
|
.suspend = s3c_adc_suspend,
|
|
.resume = s3c_adc_resume,
|
|
};
|
|
|
|
static struct platform_driver s3c_adc_driver = {
|
|
.id_table = s3c_adc_driver_ids,
|
|
.driver = {
|
|
.name = "s3c-adc",
|
|
.owner = THIS_MODULE,
|
|
.pm = &adc_pm_ops,
|
|
},
|
|
.probe = s3c_adc_probe,
|
|
.remove = s3c_adc_remove,
|
|
};
|
|
|
|
static int __init adc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = platform_driver_register(&s3c_adc_driver);
|
|
if (ret)
|
|
printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
|
|
|
|
return ret;
|
|
}
|
|
|
|
module_init(adc_init);
|