[PATCH v8 12/20] OMAP2+: UART: Add wakeup mechanism for omap-uarts
Govindraj.R
govindraj.raja at ti.com
Fri Nov 11 04:59:10 EST 2011
>From the runtime callbacks enable hwmod wakeups for uart which will
internally enable io-pad wakeups for uarts if they have rx-pad pins
set as wakeup capabale.
Use the io-ring wakeup mechanism after uart clock gating and leave
the PM_WKST set for uart to default reset values cleanup the
code in serial.c which was handling PM_WKST reg.
Irq_chaing(PRM_DRIVER) is used to wakeup uart after uart clocks are gated
using pad wakeup mechanism.
Signed-off-by: Govindraj.R <govindraj.raja at ti.com>
---
arch/arm/mach-omap2/serial.c | 96 +++---------------------
arch/arm/plat-omap/include/plat/omap-serial.h | 2 +
drivers/tty/serial/omap-serial.c | 15 ++++
3 files changed, 29 insertions(+), 84 deletions(-)
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index a52bd99..d1d8b88 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -56,10 +56,6 @@ struct omap_uart_state {
int num;
int can_sleep;
- void __iomem *wk_st;
- void __iomem *wk_en;
- u32 wk_mask;
-
int clocked;
struct list_head node;
@@ -92,26 +88,6 @@ static inline void omap_uart_disable_clocks(struct omap_uart_state *uart)
omap_device_idle(uart->pdev);
}
-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);
- }
-}
-
-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);
- }
-}
-
static void omap_uart_block_sleep(struct omap_uart_state *uart)
{
omap_uart_enable_clocks(uart);
@@ -141,65 +117,17 @@ int omap_uart_can_sleep(void)
return can_sleep;
}
-static void omap_uart_idle_init(struct omap_uart_state *uart)
+static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
{
- int ret;
-
- uart->can_sleep = 0;
- omap_uart_smart_idle_enable(uart, 0);
+ struct omap_device *od = to_omap_device(pdev);
- if (cpu_is_omap34xx() && !cpu_is_ti816x()) {
- u32 mod = (uart->num > 1) ? OMAP3430_PER_MOD : CORE_MOD;
- u32 wk_mask = 0;
+ if (!od)
+ return;
- /* XXX These PRM accesses do not belong here */
- uart->wk_en = OMAP34XX_PRM_REGADDR(mod, PM_WKEN1);
- uart->wk_st = OMAP34XX_PRM_REGADDR(mod, PM_WKST1);
- switch (uart->num) {
- case 0:
- wk_mask = OMAP3430_ST_UART1_MASK;
- break;
- case 1:
- wk_mask = OMAP3430_ST_UART2_MASK;
- break;
- case 2:
- wk_mask = OMAP3430_ST_UART3_MASK;
- break;
- case 3:
- wk_mask = OMAP3630_ST_UART4_MASK;
- break;
- }
- uart->wk_mask = wk_mask;
- } else if (cpu_is_omap24xx()) {
- u32 wk_mask = 0;
- u32 wk_en = PM_WKEN1, wk_st = PM_WKST1;
-
- switch (uart->num) {
- case 0:
- wk_mask = OMAP24XX_ST_UART1_MASK;
- break;
- case 1:
- wk_mask = OMAP24XX_ST_UART2_MASK;
- break;
- case 2:
- wk_en = OMAP24XX_PM_WKEN2;
- wk_st = OMAP24XX_PM_WKST2;
- wk_mask = OMAP24XX_ST_UART3_MASK;
- break;
- }
- uart->wk_mask = wk_mask;
- if (cpu_is_omap2430()) {
- uart->wk_en = OMAP2430_PRM_REGADDR(CORE_MOD, wk_en);
- uart->wk_st = OMAP2430_PRM_REGADDR(CORE_MOD, wk_st);
- } else if (cpu_is_omap2420()) {
- uart->wk_en = OMAP2420_PRM_REGADDR(CORE_MOD, wk_en);
- uart->wk_st = OMAP2420_PRM_REGADDR(CORE_MOD, wk_st);
- }
- } else {
- uart->wk_en = NULL;
- uart->wk_st = NULL;
- uart->wk_mask = 0;
- }
+ if (enable)
+ omap_hwmod_enable_wakeup(od->hwmods[0]);
+ else
+ omap_hwmod_disable_wakeup(od->hwmods[0]);
}
/*
@@ -222,6 +150,8 @@ static void omap_uart_set_forceidle(struct platform_device *pdev)
}
#else
+static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
+{}
static void omap_uart_set_noidle(struct platform_device *pdev) {}
static void omap_uart_set_forceidle(struct platform_device *pdev) {}
static void omap_uart_block_sleep(struct omap_uart_state *uart)
@@ -437,6 +367,7 @@ void __init omap_serial_init_port(struct omap_board_data *bdata)
omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
omap_up.set_forceidle = omap_uart_set_forceidle;
omap_up.set_noidle = omap_uart_set_noidle;
+ omap_up.enable_wakeup = omap_uart_enable_wakeup;
/* Enable the MDR1 errata for OMAP2/3/4 */
if ((cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) &&
@@ -471,15 +402,12 @@ void __init omap_serial_init_port(struct omap_board_data *bdata)
omap_hwmod_idle(uart->oh);
omap_device_enable(uart->pdev);
- omap_uart_idle_init(uart);
- omap_hwmod_enable_wakeup(uart->oh);
omap_device_idle(uart->pdev);
omap_uart_block_sleep(uart);
console_unlock();
- if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads) ||
- (pdata->wk_en && pdata->wk_mask))
+ if ((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads)
device_init_wakeup(&pdev->dev, true);
}
diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h
index fd3d2f7..f3ecfb2 100644
--- a/arch/arm/plat-omap/include/plat/omap-serial.h
+++ b/arch/arm/plat-omap/include/plat/omap-serial.h
@@ -69,6 +69,7 @@ struct omap_uart_port_info {
int (*get_context_loss_count)(struct device *);
void (*set_forceidle)(struct platform_device *);
void (*set_noidle)(struct platform_device *);
+ void (*enable_wakeup)(struct platform_device *, bool);
};
struct uart_omap_dma {
@@ -123,6 +124,7 @@ struct uart_omap_port {
unsigned long port_activity;
u32 context_loss_cnt;
u32 errata;
+ u8 wakeups_enabled;
};
#endif /* __OMAP_SERIAL_H__ */
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 77f0829..29cd401 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1496,9 +1496,24 @@ static int serial_omap_runtime_suspend(struct device *dev)
if (!up)
return -EINVAL;
+ if (!pdata->enable_wakeup)
+ return 0;
+
if (pdata->get_context_loss_count)
up->context_loss_cnt = pdata->get_context_loss_count(dev);
+ if (device_may_wakeup(dev)) {
+ if (!up->wakeups_enabled) {
+ pdata->enable_wakeup(up->pdev, true);
+ up->wakeups_enabled = true;
+ }
+ } else {
+ if (up->wakeups_enabled) {
+ pdata->enable_wakeup(up->pdev, false);
+ up->wakeups_enabled = false;
+ }
+ }
+
/* Errata i291 */
if (up->use_dma && pdata->set_forceidle)
pdata->set_forceidle(up->pdev);
--
1.7.4.1
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