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authorBen Dooks <ben-linux@fluff.org>2008-12-12 00:24:20 +0000
committerBen Dooks <ben-linux@fluff.org>2009-03-08 12:37:10 +0000
commitd2b07fe2a3e35d8e58cceb63ab58831d706da939 (patch)
treefec7bcae153eb12d482a809967ac4809809337fe
parentef30e14420df546bc6576b00f9caf3379b6699d1 (diff)
[ARM] S3C: Update UART save over PM suspend/resume
Change the way the UART state is saved over suspend to allow the s3c64xx code to modify the settings on resume to avoid any illegal state changes to the UART clocks. This will also allow us to save the UDIVSLOT register on newer SoCs. Move to using a structure for the UART use the extant Kconfig configuration specifying the number of UARTs. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
-rw-r--r--arch/arm/plat-s3c/include/plat/pm.h19
-rw-r--r--arch/arm/plat-s3c/pm.c61
-rw-r--r--arch/arm/plat-s3c24xx/include/plat/map.h2
3 files changed, 60 insertions, 22 deletions
diff --git a/arch/arm/plat-s3c/include/plat/pm.h b/arch/arm/plat-s3c/include/plat/pm.h
index f121a5ac742..c27b8cf5d89 100644
--- a/arch/arm/plat-s3c/include/plat/pm.h
+++ b/arch/arm/plat-s3c/include/plat/pm.h
@@ -71,6 +71,25 @@ struct sleep_save {
#define SAVE_ITEM(x) \
{ .reg = (x) }
+/**
+ * struct pm_uart_save - save block for core UART
+ * @ulcon: Save value for S3C2410_ULCON
+ * @ucon: Save value for S3C2410_UCON
+ * @ufcon: Save value for S3C2410_UFCON
+ * @umcon: Save value for S3C2410_UMCON
+ * @ubrdiv: Save value for S3C2410_UBRDIV
+ *
+ * Save block for UART registers to be held over sleep and restored if they
+ * are needed (say by debug).
+*/
+struct pm_uart_save {
+ u32 ulcon;
+ u32 ucon;
+ u32 ufcon;
+ u32 umcon;
+ u32 ubrdiv;
+};
+
/* helper functions to save/restore lists of registers. */
extern void s3c_pm_do_save(struct sleep_save *ptr, int count);
diff --git a/arch/arm/plat-s3c/pm.c b/arch/arm/plat-s3c/pm.c
index e320b0ff385..78bf50a1402 100644
--- a/arch/arm/plat-s3c/pm.c
+++ b/arch/arm/plat-s3c/pm.c
@@ -72,33 +72,50 @@ static inline void s3c_pm_debug_init(void)
#ifdef CONFIG_S3C2410_PM_DEBUG
-#define SAVE_UART(va) \
- SAVE_ITEM((va) + S3C2410_ULCON), \
- SAVE_ITEM((va) + S3C2410_UCON), \
- SAVE_ITEM((va) + S3C2410_UFCON), \
- SAVE_ITEM((va) + S3C2410_UMCON), \
- SAVE_ITEM((va) + S3C2410_UBRDIV)
-
-static struct sleep_save uart_save[] = {
- SAVE_UART(S3C_VA_UART0),
- SAVE_UART(S3C_VA_UART1),
-#ifndef CONFIG_CPU_S3C2400
- SAVE_UART(S3C_VA_UART2),
-#endif
-};
+struct pm_uart_save uart_save[CONFIG_SERIAL_SAMSUNG_UARTS];
+
+static void s3c_pm_save_uart(unsigned int uart, struct pm_uart_save *save)
+{
+ void __iomem *regs = S3C_VA_UARTx(uart);
+
+ save->ulcon = __raw_readl(regs + S3C2410_ULCON);
+ save->ucon = __raw_readl(regs + S3C2410_UCON);
+ save->ufcon = __raw_readl(regs + S3C2410_UFCON);
+ save->umcon = __raw_readl(regs + S3C2410_UMCON);
+ save->ubrdiv = __raw_readl(regs + S3C2410_UBRDIV);
+}
-static void s3c_pm_save_uart(void)
+static void s3c_pm_save_uarts(void)
{
- s3c_pm_do_save(uart_save, ARRAY_SIZE(uart_save));
+ struct pm_uart_save *save = uart_save;
+ unsigned int uart;
+
+ for (uart = 0; uart < CONFIG_SERIAL_SAMSUNG_UARTS; uart++, save++)
+ s3c_pm_save_uart(uart, save);
+}
+
+static void s3c_pm_restore_uart(unsigned int uart, struct pm_uart_save *save)
+{
+ void __iomem *regs = S3C_VA_UARTx(uart);
+
+ __raw_writel(save->ulcon, regs + S3C2410_ULCON);
+ __raw_writel(save->ucon, regs + S3C2410_UCON);
+ __raw_writel(save->ufcon, regs + S3C2410_UFCON);
+ __raw_writel(save->umcon, regs + S3C2410_UMCON);
+ __raw_writel(save->ubrdiv, regs + S3C2410_UBRDIV);
}
-static void s3c_pm_restore_uart(void)
+static void s3c_pm_restore_uarts(void)
{
- s3c_pm_do_restore(uart_save, ARRAY_SIZE(uart_save));
+ struct pm_uart_save *save = uart_save;
+ unsigned int uart;
+
+ for (uart = 0; uart < CONFIG_SERIAL_SAMSUNG_UARTS; uart++, save++)
+ s3c_pm_restore_uart(uart, save);
}
#else
-static void s3c_pm_save_uart(void) { }
-static void s3c_pm_restore_uart(void) { }
+static void s3c_pm_save_uarts(void) { }
+static void s3c_pm_restore_uarts(void) { }
#endif
/* The IRQ ext-int code goes here, it is too small to currently bother
@@ -250,7 +267,7 @@ static int s3c_pm_enter(suspend_state_t state)
/* save all necessary core registers not covered by the drivers */
s3c_pm_save_gpios();
- s3c_pm_save_uart();
+ s3c_pm_save_uarts();
s3c_pm_save_core();
/* set the irq configuration for wake */
@@ -293,7 +310,7 @@ static int s3c_pm_enter(suspend_state_t state)
/* restore the system state */
s3c_pm_restore_core();
- s3c_pm_restore_uart();
+ s3c_pm_restore_uarts();
s3c_pm_restore_gpios();
s3c_pm_debug_init();
diff --git a/arch/arm/plat-s3c24xx/include/plat/map.h b/arch/arm/plat-s3c24xx/include/plat/map.h
index fef8ea8b8e1..eed8f78e759 100644
--- a/arch/arm/plat-s3c24xx/include/plat/map.h
+++ b/arch/arm/plat-s3c24xx/include/plat/map.h
@@ -31,6 +31,8 @@
#define S3C24XX_SZ_UART SZ_1M
#define S3C_UART_OFFSET (0x4000)
+#define S3C_VA_UARTx(uart) (S3C_VA_UART + ((uart * S3C_UART_OFFSET)))
+
/* Timers */
#define S3C24XX_VA_TIMER S3C_VA_TIMER
#define S3C2410_PA_TIMER (0x51000000)