Use resume idle call from prcm_irq to enable uart_port from low power states.
Add api to check pad wakeup status which will we used from uart_resume func.
to enable back uart port if a wakeup event occurred.
UART_Resume func. can be removed once we have irq_chaining functionality
available.
Signed-off-by: Govindraj.R <govindraj.raja@xxxxxx>
---
arch/arm/mach-omap2/pm24xx.c | 2 ++
arch/arm/mach-omap2/pm34xx.c | 2 ++
arch/arm/mach-omap2/serial.c | 23 +++++++++++++++++++++++
arch/arm/plat-omap/include/plat/omap-serial.h | 2 ++
arch/arm/plat-omap/include/plat/serial.h | 1 +
drivers/tty/serial/omap-serial.c | 23 +++++++++++++++++++++++
6 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index c405bda..ba58a1d 100644
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c
@@ -137,6 +137,8 @@ static void omap2_enter_full_retention(void)
OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
OMAP_SDRC_REGADDR(SDRC_POWER));
+ omap_uart_resume_idle();
+
no_sleep:
if (omap2_pm_debug) {
unsigned long long tmp;
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index ac7b7f8..3997e92 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -216,6 +216,8 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs)
wkst = omap2_prm_read_mod_reg(module, wkst_off);
wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
+
+ c += omap_uart_resume_idle();
if (wkst) {
iclk = omap2_cm_read_mod_reg(module, iclk_off);
fclk = omap2_cm_read_mod_reg(module, fclk_off);
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 6ac078f..4bc5914 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -199,6 +199,28 @@ static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
}
}
+/* TBD: Will be removed once we have irq-chaing mechanism */
+static bool omap_uart_chk_wakeup(struct platform_device *pdev)
+{
+ struct omap_uart_port_info *up = pdev->dev.platform_data;
+ struct omap_device *od;
+ u32 wkst = 0;
+ bool ret = false;
+
+ od = to_omap_device(pdev);
+ if (omap_hmwod_pad_get_wakeup_status(od->hwmods[0]))
+ ret = true;
+
+ /* Check for normal UART wakeup (and clear it) */
+ wkst = __raw_readl(up->wk_st) & up->wk_mask;
+ if (wkst) {
+ __raw_writel(wkst, up->wk_st);
+ ret = true;
+ }
+
+ return ret;
+}
+
static void omap_uart_wakeup_enable(struct platform_device *pdev, bool enable)
{
struct omap_uart_port_info *up = pdev->dev.platform_data;
@@ -369,6 +391,7 @@ void __init omap_serial_init_port(struct omap_board_data *bdata,
pdata->uartclk = OMAP24XX_BASE_BAUD * 16;
pdata->flags = UPF_BOOT_AUTOCONF;
pdata->enable_wakeup = omap_uart_wakeup_enable;
+ pdata->chk_wakeup = omap_uart_chk_wakeup;
pdata->dma_enabled = info->dma_enabled;
pdata->dma_rx_buf_size = info->dma_rx_buf_size;
pdata->dma_rx_poll_rate = info->dma_rx_poll_rate;
diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h
index c5f4dd9..b5117bd 100644
--- a/arch/arm/plat-omap/include/plat/omap-serial.h
+++ b/arch/arm/plat-omap/include/plat/omap-serial.h
@@ -75,6 +75,7 @@ struct omap_uart_port_info {
unsigned int auto_sus_timeout; /* Auto_suspend timeout */
void (*enable_wakeup)(struct platform_device *, bool);
+ bool (*chk_wakeup)(struct platform_device *);
void __iomem *wk_st;
void __iomem *wk_en;
u32 wk_mask;
@@ -132,6 +133,7 @@ struct uart_omap_port {
unsigned long port_activity;
unsigned int errata;
void (*enable_wakeup)(struct platform_device *, bool);
+ bool (*chk_wakeup)(struct platform_device *);
};
#endif /* __OMAP_SERIAL_H__ */
diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h
index ee758d4..44a42aa 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/arch/arm/plat-omap/include/plat/serial.h
@@ -109,6 +109,7 @@ extern void omap_serial_init(void);
extern void omap_serial_board_init(struct omap_uart_port_info *platform_data);
extern void omap_serial_init_port(struct omap_board_data *bdata,
struct omap_uart_port_info *platform_data);
+extern u32 omap_uart_resume_idle(void);
#endif
#endif
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 307b7c6..c3561dd 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -43,6 +43,7 @@
#include <plat/dmtimer.h>
#include <plat/omap-serial.h>
#include <plat/omap_device.h>
+#include <plat/serial.h>
static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
@@ -108,6 +109,27 @@ static inline void serial_omap_port_enable(struct uart_omap_port *up)
pm_runtime_get_sync(&up->pdev->dev);
}
+/* TBD: Should be removed once we irq-chaining mechanism in place */
+u32 omap_uart_resume_idle()
+{
+ int i;
+ u32 ret = 0;
+
+ for (i = 0; i < OMAP_MAX_HSUART_PORTS; i++) {
+ struct uart_omap_port *up = ui[i];
+
+ if (!up)
+ continue;
+
+ if (up->chk_wakeup(up->pdev)) {
+ serial_omap_port_enable(up);
+ serial_omap_port_disable(up);
+ ret++;
+ }
+ }
+ return ret;
+}
+
static void serial_omap_stop_rxdma(struct uart_omap_port *up)
{
if (up->uart_dma.rx_dma_used) {
@@ -1392,6 +1414,7 @@ static int serial_omap_probe(struct platform_device *pdev)
up->uart_dma.uart_base = mem->start;
up->errata = omap_up_info->errata;
up->enable_wakeup = omap_up_info->enable_wakeup;
+ up->chk_wakeup = omap_up_info->chk_wakeup;
if (omap_up_info->dma_enabled) {
up->uart_dma.uart_dma_tx = dma_tx->start;
--
1.7.0.4
--
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