[ARM] S3C: PM save UART UDIVSLOT if doing PM

Add the facility to save the UART UDIVSLOT register if the UART
state is being saved over suspend.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

2 files changed, 11 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c/include/plat/pm.h b/arch/arm/plat-s3c/include/plat/pm.h
index 3779775133a9..5f8707e2a09c 100644
--- a/arch/arm/plat-s3c/include/plat/pm.h
+++ b/arch/arm/plat-s3c/include/plat/pm.h
@@ -44,6 +44,8 @@ extern void (*pm_cpu_sleep)(void);
 
 extern unsigned long s3c_pm_flags;
 
+extern unsigned char pm_uart_udivslot;  /* true to save UART UDIVSLOT */
+
 /* from sleep.S */
 
 extern int  s3c_cpu_save(unsigned long *saveblk);
@@ -88,6 +90,7 @@ struct pm_uart_save {
         u32     ufcon;
         u32     umcon;
         u32     ubrdiv;
+        u32     udivslot;
 };
 
 /* helper functions to save/restore lists of registers. */
diff --git a/arch/arm/plat-s3c/pm.c b/arch/arm/plat-s3c/pm.c
index de4c4aa22468..9957b539600f 100644
--- a/arch/arm/plat-s3c/pm.c
+++ b/arch/arm/plat-s3c/pm.c
@@ -70,6 +70,8 @@ static inline void s3c_pm_debug_init(void)
 
 /* Save the UART configurations if we are configured for debug. */
 
+unsigned char pm_uart_udivslot;
+
 #ifdef CONFIG_S3C2410_PM_DEBUG
 
 struct pm_uart_save uart_save[CONFIG_SERIAL_SAMSUNG_UARTS];
@@ -84,6 +86,9 @@ static void s3c_pm_save_uart(unsigned int uart, struct pm_uart_save *save)
         save->umcon = __raw_readl(regs + S3C2410_UMCON);
         save->ubrdiv = __raw_readl(regs + S3C2410_UBRDIV);
 
+        if (pm_uart_udivslot)
+                save->udivslot = __raw_readl(regs + S3C2443_DIVSLOT);
+
         S3C_PMDBG("UART[%d]: ULCON=%04x, UCON=%04x, UFCON=%04x, UBRDIV=%04x\n",
                   uart, save->ulcon, save->ucon, save->ufcon, save->ubrdiv);
 }
@@ -108,6 +113,9 @@ static void s3c_pm_restore_uart(unsigned int uart, struct pm_uart_save *save)
         __raw_writel(save->ufcon, regs + S3C2410_UFCON);
         __raw_writel(save->umcon, regs + S3C2410_UMCON);
         __raw_writel(save->ubrdiv, regs + S3C2410_UBRDIV);
+
+        if (pm_uart_udivslot)
+                __raw_writel(save->udivslot, regs + S3C2443_DIVSLOT);
 }
 
 static void s3c_pm_restore_uarts(void)