mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 14:52:05 +00:00
OMAP2/3/4: UART: Allow per-UART disabling wakeup for serial ports
This patch causes the OMAP uarts to honor the sysfs power/wakeup file for IOPAD wakeups. Before the OMAP was always woken up from off mode on a rs232 signal change. This patch also creates a different platform device for each serial port so that the wakeup properties can be control per port. By default, IOPAD wakeups are enabled for each UART. To disable, # echo disabled > /sys/devices/platform/serial8250.0/power/wakeup Where serial8250.0 can be replaced by .1, or .2 to control the other ports. Original idea and original patch from Russ Dill <russ.dill@gmail.com> Cc: Russ Dill <russ.dill@gmail.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Kevin Hilman
parent
2466211e5d
commit
fd455ea899
@ -54,6 +54,7 @@ struct omap_uart_state {
|
||||
|
||||
struct plat_serial8250_port *p;
|
||||
struct list_head node;
|
||||
struct platform_device pdev;
|
||||
|
||||
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
|
||||
int context_valid;
|
||||
@ -68,10 +69,9 @@ struct omap_uart_state {
|
||||
#endif
|
||||
};
|
||||
|
||||
static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS];
|
||||
static LIST_HEAD(uart_list);
|
||||
|
||||
static struct plat_serial8250_port serial_platform_data[] = {
|
||||
static struct plat_serial8250_port serial_platform_data0[] = {
|
||||
{
|
||||
.membase = IO_ADDRESS(OMAP_UART1_BASE),
|
||||
.mapbase = OMAP_UART1_BASE,
|
||||
@ -81,6 +81,12 @@ static struct plat_serial8250_port serial_platform_data[] = {
|
||||
.regshift = 2,
|
||||
.uartclk = OMAP24XX_BASE_BAUD * 16,
|
||||
}, {
|
||||
.flags = 0
|
||||
}
|
||||
};
|
||||
|
||||
static struct plat_serial8250_port serial_platform_data1[] = {
|
||||
{
|
||||
.membase = IO_ADDRESS(OMAP_UART2_BASE),
|
||||
.mapbase = OMAP_UART2_BASE,
|
||||
.irq = 73,
|
||||
@ -89,6 +95,12 @@ static struct plat_serial8250_port serial_platform_data[] = {
|
||||
.regshift = 2,
|
||||
.uartclk = OMAP24XX_BASE_BAUD * 16,
|
||||
}, {
|
||||
.flags = 0
|
||||
}
|
||||
};
|
||||
|
||||
static struct plat_serial8250_port serial_platform_data2[] = {
|
||||
{
|
||||
.membase = IO_ADDRESS(OMAP_UART3_BASE),
|
||||
.mapbase = OMAP_UART3_BASE,
|
||||
.irq = 74,
|
||||
@ -217,6 +229,40 @@ static inline void omap_uart_disable_clocks(struct omap_uart_state *uart)
|
||||
clk_disable(uart->fck);
|
||||
}
|
||||
|
||||
static void omap_uart_enable_wakeup(struct omap_uart_state *uart)
|
||||
{
|
||||
/* Set wake-enable bit */
|
||||
if (uart->wk_en && uart->wk_mask) {
|
||||
u32 v = __raw_readl(uart->wk_en);
|
||||
v |= uart->wk_mask;
|
||||
__raw_writel(v, uart->wk_en);
|
||||
}
|
||||
|
||||
/* Ensure IOPAD wake-enables are set */
|
||||
if (cpu_is_omap34xx() && uart->padconf) {
|
||||
u16 v = omap_ctrl_readw(uart->padconf);
|
||||
v |= OMAP3_PADCONF_WAKEUPENABLE0;
|
||||
omap_ctrl_writew(v, uart->padconf);
|
||||
}
|
||||
}
|
||||
|
||||
static void omap_uart_disable_wakeup(struct omap_uart_state *uart)
|
||||
{
|
||||
/* Clear wake-enable bit */
|
||||
if (uart->wk_en && uart->wk_mask) {
|
||||
u32 v = __raw_readl(uart->wk_en);
|
||||
v &= ~uart->wk_mask;
|
||||
__raw_writel(v, uart->wk_en);
|
||||
}
|
||||
|
||||
/* Ensure IOPAD wake-enables are cleared */
|
||||
if (cpu_is_omap34xx() && uart->padconf) {
|
||||
u16 v = omap_ctrl_readw(uart->padconf);
|
||||
v &= ~OMAP3_PADCONF_WAKEUPENABLE0;
|
||||
omap_ctrl_writew(v, uart->padconf);
|
||||
}
|
||||
}
|
||||
|
||||
static void omap_uart_smart_idle_enable(struct omap_uart_state *uart,
|
||||
int enable)
|
||||
{
|
||||
@ -246,6 +292,11 @@ static void omap_uart_block_sleep(struct omap_uart_state *uart)
|
||||
|
||||
static void omap_uart_allow_sleep(struct omap_uart_state *uart)
|
||||
{
|
||||
if (device_may_wakeup(&uart->pdev.dev))
|
||||
omap_uart_enable_wakeup(uart);
|
||||
else
|
||||
omap_uart_disable_wakeup(uart);
|
||||
|
||||
if (!uart->clocked)
|
||||
return;
|
||||
|
||||
@ -292,7 +343,6 @@ void omap_uart_resume_idle(int num)
|
||||
/* Check for normal UART wakeup */
|
||||
if (__raw_readl(uart->wk_st) & uart->wk_mask)
|
||||
omap_uart_block_sleep(uart);
|
||||
|
||||
return;
|
||||
}
|
||||
}
|
||||
@ -346,16 +396,13 @@ static irqreturn_t omap_uart_interrupt(int irq, void *dev_id)
|
||||
return IRQ_NONE;
|
||||
}
|
||||
|
||||
static u32 sleep_timeout = DEFAULT_TIMEOUT;
|
||||
|
||||
static void omap_uart_idle_init(struct omap_uart_state *uart)
|
||||
{
|
||||
u32 v;
|
||||
struct plat_serial8250_port *p = uart->p;
|
||||
int ret;
|
||||
|
||||
uart->can_sleep = 0;
|
||||
uart->timeout = sleep_timeout;
|
||||
uart->timeout = DEFAULT_TIMEOUT;
|
||||
setup_timer(&uart->timer, omap_uart_idle_timer,
|
||||
(unsigned long) uart);
|
||||
mod_timer(&uart->timer, jiffies + uart->timeout);
|
||||
@ -413,22 +460,6 @@ static void omap_uart_idle_init(struct omap_uart_state *uart)
|
||||
uart->padconf = 0;
|
||||
}
|
||||
|
||||
/* Set wake-enable bit */
|
||||
if (uart->wk_en && uart->wk_mask) {
|
||||
v = __raw_readl(uart->wk_en);
|
||||
v |= uart->wk_mask;
|
||||
__raw_writel(v, uart->wk_en);
|
||||
}
|
||||
|
||||
/* Ensure IOPAD wake-enables are set */
|
||||
if (cpu_is_omap34xx() && uart->padconf) {
|
||||
u16 v;
|
||||
|
||||
v = omap_ctrl_readw(uart->padconf);
|
||||
v |= OMAP3_PADCONF_WAKEUPENABLE0;
|
||||
omap_ctrl_writew(v, uart->padconf);
|
||||
}
|
||||
|
||||
p->flags |= UPF_SHARE_IRQ;
|
||||
ret = request_irq(p->irq, omap_uart_interrupt, IRQF_SHARED,
|
||||
"serial idle", (void *)uart);
|
||||
@ -449,54 +480,81 @@ void omap_uart_enable_irqs(int enable)
|
||||
}
|
||||
}
|
||||
|
||||
static ssize_t sleep_timeout_show(struct kobject *kobj,
|
||||
struct kobj_attribute *attr,
|
||||
static ssize_t sleep_timeout_show(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
return sprintf(buf, "%u\n", sleep_timeout / HZ);
|
||||
struct platform_device *pdev = container_of(dev,
|
||||
struct platform_device, dev);
|
||||
struct omap_uart_state *uart = container_of(pdev,
|
||||
struct omap_uart_state, pdev);
|
||||
|
||||
return sprintf(buf, "%u\n", uart->timeout / HZ);
|
||||
}
|
||||
|
||||
static ssize_t sleep_timeout_store(struct kobject *kobj,
|
||||
struct kobj_attribute *attr,
|
||||
static ssize_t sleep_timeout_store(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t n)
|
||||
{
|
||||
struct omap_uart_state *uart;
|
||||
struct platform_device *pdev = container_of(dev,
|
||||
struct platform_device, dev);
|
||||
struct omap_uart_state *uart = container_of(pdev,
|
||||
struct omap_uart_state, pdev);
|
||||
unsigned int value;
|
||||
|
||||
if (sscanf(buf, "%u", &value) != 1) {
|
||||
printk(KERN_ERR "sleep_timeout_store: Invalid value\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
sleep_timeout = value * HZ;
|
||||
list_for_each_entry(uart, &uart_list, node) {
|
||||
uart->timeout = sleep_timeout;
|
||||
if (uart->timeout)
|
||||
mod_timer(&uart->timer, jiffies + uart->timeout);
|
||||
else
|
||||
/* A zero value means disable timeout feature */
|
||||
omap_uart_block_sleep(uart);
|
||||
}
|
||||
|
||||
uart->timeout = value * HZ;
|
||||
if (uart->timeout)
|
||||
mod_timer(&uart->timer, jiffies + uart->timeout);
|
||||
else
|
||||
/* A zero value means disable timeout feature */
|
||||
omap_uart_block_sleep(uart);
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
static struct kobj_attribute sleep_timeout_attr =
|
||||
__ATTR(sleep_timeout, 0644, sleep_timeout_show, sleep_timeout_store);
|
||||
|
||||
DEVICE_ATTR(sleep_timeout, 0644, sleep_timeout_show, sleep_timeout_store);
|
||||
#define DEV_CREATE_FILE(dev, attr) WARN_ON(device_create_file(dev, attr))
|
||||
#else
|
||||
static inline void omap_uart_idle_init(struct omap_uart_state *uart) {}
|
||||
#define DEV_CREATE_FILE(dev, attr)
|
||||
#endif /* CONFIG_PM */
|
||||
|
||||
static struct platform_device serial_device = {
|
||||
.name = "serial8250",
|
||||
.id = PLAT8250_DEV_PLATFORM,
|
||||
.dev = {
|
||||
.platform_data = serial_platform_data,
|
||||
static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS] = {
|
||||
{
|
||||
.pdev = {
|
||||
.name = "serial8250",
|
||||
.id = PLAT8250_DEV_PLATFORM,
|
||||
.dev = {
|
||||
.platform_data = serial_platform_data0,
|
||||
},
|
||||
},
|
||||
}, {
|
||||
.pdev = {
|
||||
.name = "serial8250",
|
||||
.id = PLAT8250_DEV_PLATFORM1,
|
||||
.dev = {
|
||||
.platform_data = serial_platform_data1,
|
||||
},
|
||||
},
|
||||
}, {
|
||||
.pdev = {
|
||||
.name = "serial8250",
|
||||
.id = PLAT8250_DEV_PLATFORM2,
|
||||
.dev = {
|
||||
.platform_data = serial_platform_data2,
|
||||
},
|
||||
},
|
||||
},
|
||||
};
|
||||
|
||||
void __init omap_serial_init(void)
|
||||
{
|
||||
int i, err;
|
||||
int i;
|
||||
const struct omap_uart_config *info;
|
||||
char name[16];
|
||||
|
||||
@ -512,8 +570,10 @@ void __init omap_serial_init(void)
|
||||
return;
|
||||
|
||||
for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
|
||||
struct plat_serial8250_port *p = serial_platform_data + i;
|
||||
struct omap_uart_state *uart = &omap_uart[i];
|
||||
struct platform_device *pdev = &uart->pdev;
|
||||
struct device *dev = &pdev->dev;
|
||||
struct plat_serial8250_port *p = dev->platform_data;
|
||||
|
||||
if (!(info->enabled_uarts & (1 << i))) {
|
||||
p->membase = NULL;
|
||||
@ -549,15 +609,13 @@ void __init omap_serial_init(void)
|
||||
omap_uart_enable_clocks(uart);
|
||||
omap_uart_reset(uart);
|
||||
omap_uart_idle_init(uart);
|
||||
|
||||
if (WARN_ON(platform_device_register(pdev)))
|
||||
continue;
|
||||
if ((cpu_is_omap34xx() && uart->padconf) ||
|
||||
(uart->wk_en && uart->wk_mask)) {
|
||||
device_init_wakeup(dev, true);
|
||||
DEV_CREATE_FILE(dev, &dev_attr_sleep_timeout);
|
||||
}
|
||||
}
|
||||
|
||||
err = platform_device_register(&serial_device);
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
if (!err)
|
||||
err = sysfs_create_file(&serial_device.dev.kobj,
|
||||
&sleep_timeout_attr.attr);
|
||||
#endif
|
||||
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user