Commit 62f3ec5f authored by Govindraj.R's avatar Govindraj.R Committed by Kevin Hilman
Browse files

ARM: OMAP2+: UART: Add wakeup mechanism for omap-uarts 



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: default avatarGovindraj.R <govindraj.raja@ti.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de> (for drivers/tty changes)
Signed-off-by: default avatarKevin Hilman <khilman@ti.com>
parent 94734749

arch/arm/mach-omap2/serial.c

+12 −84
Original line number Diff line number Diff line
@@ -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);



	if (cpu_is_omap34xx() && !(cpu_is_ti81xx() || cpu_is_am33xx())) {

		u32 mod = (uart->num > 1) ? OMAP3430_PER_MOD : CORE_MOD;

		u32 wk_mask = 0;

	struct omap_device *od = to_omap_device(pdev);



		/* 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;

	if (!od)

		return;



		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 i202 for OMAP2430/3xxx/44xx */

	if (!cpu_is_omap2420() && !cpu_is_ti816x())
@@ -474,15 +405,12 @@ 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);

}

arch/arm/plat-omap/include/plat/omap-serial.h

+2 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ 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 {
@@ -124,6 +125,7 @@ struct uart_omap_port { 
	unsigned long		port_activity;

	u32			context_loss_cnt;

	u32			errata;

	u8			wakeups_enabled;

};



#endif /* __OMAP_SERIAL_H__ */

drivers/tty/serial/omap-serial.c

+15 −0
Original line number Diff line number Diff line
@@ -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 &&

			(up->errata & UART_ERRATA_i291_DMA_FORCEIDLE))

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