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Subject[PATCHv9 16/18] TEMP: OMAP3: serial: made serial to work properly with PRCM chain handler
Date
This patch is just a temporary hack to allow serial to work properly with
the PRCM chain handler. Should be replaced with a proper implementation
by serial runtime PM support.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: Govindraj.R <govindraj.raja@ti.com>
---
arch/arm/mach-omap2/serial.c | 29 +++++++++--------------------
drivers/tty/serial/omap-serial.c | 8 ++++++++
2 files changed, 17 insertions(+), 20 deletions(-)
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index e08feb1..0cc5434 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -39,6 +39,7 @@
#include <plat/dma.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
+#include <plat/prcm.h>

#include "prm2xxx_3xxx.h"
#include "pm.h"
@@ -380,6 +381,7 @@ static void omap_uart_allow_sleep(struct omap_uart_state *uart)
omap_uart_smart_idle_enable(uart, 1);
uart->can_sleep = 1;
del_timer(&uart->timer);
+ omap_uart_disable_clocks(uart);
}

static void omap_uart_idle_timer(unsigned long data)
@@ -391,36 +393,23 @@ static void omap_uart_idle_timer(unsigned long data)

void omap_uart_prepare_idle(int num)
{
- struct omap_uart_state *uart;
-
- list_for_each_entry(uart, &uart_list, node) {
- if (num == uart->num && uart->can_sleep) {
- omap_uart_disable_clocks(uart);
- return;
- }
- }
}

void omap_uart_resume_idle(int num)
{
struct omap_uart_state *uart;
+ u32 wkst;

list_for_each_entry(uart, &uart_list, node) {
if (num == uart->num && uart->can_sleep) {
- omap_uart_enable_clocks(uart);
+ omap_uart_block_sleep(uart);

- /* Check for IO pad wakeup */
- if (cpu_is_omap34xx() && uart->padconf) {
- u16 p = omap_ctrl_readw(uart->padconf);
-
- if (p & OMAP3_PADCONF_WAKEUPEVENT0)
- omap_uart_block_sleep(uart);
+ /* Check for normal UART wakeup (and clear it) */
+ if (uart->wk_st && uart->wk_mask) {
+ wkst = __raw_readl(uart->wk_st) & uart->wk_mask;
+ if (wkst)
+ __raw_writel(wkst, uart->wk_st);
}
-
- /* Check for normal UART wakeup */
- if (__raw_readl(uart->wk_st) & uart->wk_mask)
- omap_uart_block_sleep(uart);
- return;
}
}
}
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index c37df8d..cfff8ac 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -261,6 +261,8 @@ static void serial_omap_start_tx(struct uart_port *port)
unsigned int start;
int ret = 0;

+ omap_uart_resume_idle(up->pdev->id);
+
if (!up->use_dma) {
serial_omap_enable_ier_thri(up);
return;
@@ -354,6 +356,8 @@ static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
unsigned int iir, lsr;
unsigned long flags;

+ omap_uart_resume_idle(up->pdev->id);
+
iir = serial_in(up, UART_IIR);
if (iir & UART_IIR_NO_INT)
return IRQ_NONE;
@@ -641,6 +645,8 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
unsigned long flags = 0;
unsigned int baud, quot;

+ omap_uart_resume_idle(up->pdev->id);
+
switch (termios->c_cflag & CSIZE) {
case CS5:
cval = UART_LCR_WLEN5;
@@ -947,6 +953,8 @@ serial_omap_console_write(struct console *co, const char *s,
unsigned int ier;
int locked = 1;

+ omap_uart_resume_idle(up->pdev->id);
+
local_irq_save(flags);
if (up->port.sysrq)
locked = 0;
--
1.7.4.1

Texas Instruments Oy, Tekniikantie 12, 02150 Espoo. Y-tunnus: 0115040-6. Kotipaikka: Helsinki




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