This patch adds the context save restore functions for UART
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
arch/arm/mach-omap2/serial.c | 65 +++++++++++++++++++++++++++++++
arch/arm/plat-omap/include/mach/serial.h | 4 +
include/linux/serial_reg.h | 1
3 files changed, 70 insertions(+)
Index: linux-omap-2.6/arch/arm/mach-omap2/serial.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/serial.c 2008-09-25 16:27:11.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/serial.c 2008-09-25 16:27:13.000000000 +0530
@@ -68,6 +68,17 @@ static const u32 omap3_uart_wk_bit[OMAP_
OMAP3430_ST_UART2,
OMAP3430_ST_UART3,
};
+
+struct omap3_uart_regs {
+ u16 dll;
+ u16 dlh;
+ u16 ier;
+ u16 sysc;
+ u16 scr;
+ u16 wer;
+};
+
+static struct omap3_uart_regs uart_context[OMAP_MAX_NR_PORTS];
#endif
static const u32 *omap_uart_wk_st;
@@ -315,6 +326,60 @@ static ssize_t awake_store(struct kobjec
return n;
}
+#ifdef CONFIG_ARCH_OMAP3
+void omap3_uart_save_context(int unum)
+{
+ u16 lcr = 0;
+
+ struct plat_serial8250_port *p = serial_platform_data + unum;
+
+ if (uart_ick[unum] == NULL)
+ return;
+
+ lcr = serial_read_reg(p, UART_LCR);
+ serial_write_reg(p, UART_LCR, 0xBF);
+ uart_context[unum].dll = serial_read_reg(p, UART_DLL);
+ uart_context[unum].dlh = serial_read_reg(p, UART_DLM);
+ serial_write_reg(p, UART_LCR, lcr);
+ uart_context[unum].ier = serial_read_reg(p, UART_IER);
+ uart_context[unum].sysc = serial_read_reg(p, UART_OMAP_SYSC);
+ uart_context[unum].scr = serial_read_reg(p, UART_OMAP_SCR);
+ uart_context[unum].wer = serial_read_reg(p, UART_OMAP_WER);
+}
+EXPORT_SYMBOL(omap3_uart_save_context);
+
+void omap3_uart_restore_context(int unum)
+{
+ u16 efr = 0;
+
+ struct plat_serial8250_port *p = serial_platform_data + unum;
+
+ if (uart_ick[unum] == NULL)
+ return;
+
+ serial_write_reg(p, UART_OMAP_MDR1, 0x7);
+ serial_write_reg(p, UART_LCR, 0xBF); /* Config B mode */
+ efr = serial_read_reg(p, UART_EFR);
+ serial_write_reg(p, UART_EFR, UART_EFR_ECB);
+ serial_write_reg(p, UART_LCR, 0x0); /* Operational mode */
+ serial_write_reg(p, UART_IER, 0x0);
+ serial_write_reg(p, UART_LCR, 0xBF); /* Config B mode */
+ serial_write_reg(p, UART_DLL, uart_context[unum].dll);
+ serial_write_reg(p, UART_DLM, uart_context[unum].dlh);
+ serial_write_reg(p, UART_LCR, 0x0); /* Operational mode */
+ serial_write_reg(p, UART_IER, uart_context[unum].ier);
+ serial_write_reg(p, UART_FCR, 0xA1);
+ serial_write_reg(p, UART_LCR, 0xBF); /* Config B mode */
+ serial_write_reg(p, UART_EFR, efr);
+ serial_write_reg(p, UART_LCR, UART_LCR_WLEN8);
+ serial_write_reg(p, UART_OMAP_SCR, uart_context[unum].scr);
+ serial_write_reg(p, UART_OMAP_WER, uart_context[unum].wer);
+ serial_write_reg(p, UART_OMAP_SYSC, uart_context[unum].sysc);
+ serial_write_reg(p, UART_OMAP_MDR1, 0x00); /* UART 16x mode */
+}
+EXPORT_SYMBOL(omap3_uart_restore_context);
+#endif /* CONFIG_ARCH_OMAP3 */
+
static struct platform_device serial_device = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
Index: linux-omap-2.6/include/linux/serial_reg.h
===================================================================
--- linux-omap-2.6.orig/include/linux/serial_reg.h 2008-09-25 16:26:40.000000000 +0530
+++ linux-omap-2.6/include/linux/serial_reg.h 2008-09-25 16:27:13.000000000 +0530
@@ -323,6 +323,7 @@
#define UART_OMAP_MVER 0x14 /* Module version register */
#define UART_OMAP_SYSC 0x15 /* System configuration register */
#define UART_OMAP_SYSS 0x16 /* System status register */
+#define UART_OMAP_WER 0x17 /* Wake-up enable register */
#endif /* _LINUX_SERIAL_REG_H */
Index: linux-omap-2.6/arch/arm/plat-omap/include/mach/serial.h
===================================================================
--- linux-omap-2.6.orig/arch/arm/plat-omap/include/mach/serial.h 2008-09-25 16:26:40.000000000 +0530
+++ linux-omap-2.6/arch/arm/plat-omap/include/mach/serial.h 2008-09-25 16:27:13.000000000 +0530
@@ -40,4 +40,8 @@
__ret; \
})
+#ifndef __ASSEMBLY__
+extern void omap3_uart_save_context(int unum);
+extern void omap3_uart_restore_context(int unum);
+#endif /* __ASSEMBLY__ */
#endif
--
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