ARM: OMAP2 Provide function to enable/disable uart clocks

This patch adds common function to enable/disable omap2/3 uart
clocks. Enabled uarts are passed by bootloader in atags and clocks for
these enabled uarts are touched.

Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 40 insertions, 60 deletions

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 69651cf08305..78ab2be70241 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -3,7 +3,7 @@
  *
  * OMAP2 serial support.
  *
- * Copyright (C) 2005 Nokia Corporation
+ * Copyright (C) 2005-2008 Nokia Corporation
  * Author: Paul Mundt <paul.mundt@nokia.com>
  *
  * Based off of arch/arm/mach-omap/omap1/serial.c
@@ -23,12 +23,8 @@
 #include <mach/common.h>
 #include <mach/board.h>
 
-static struct clk * uart1_ick = NULL;
-static struct clk * uart1_fck = NULL;
-static struct clk * uart2_ick = NULL;
-static struct clk * uart2_fck = NULL;
-static struct clk * uart3_ick = NULL;
-static struct clk * uart3_fck = NULL;
+static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
+static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
 
 static struct plat_serial8250_port serial_platform_data[] = {
         {
@@ -38,7 +34,7 @@ static struct plat_serial8250_port serial_platform_data[] = {
                 .flags          = UPF_BOOT_AUTOCONF,
                 .iotype         = UPIO_MEM,
                 .regshift       = 2,
-                .uartclk        = OMAP16XX_BASE_BAUD * 16,
+                .uartclk        = OMAP24XX_BASE_BAUD * 16,
         }, {
                 .membase        = IO_ADDRESS(OMAP_UART2_BASE),
                 .mapbase        = OMAP_UART2_BASE,
@@ -46,7 +42,7 @@ static struct plat_serial8250_port serial_platform_data[] = {
                 .flags          = UPF_BOOT_AUTOCONF,
                 .iotype         = UPIO_MEM,
                 .regshift       = 2,
-                .uartclk        = OMAP16XX_BASE_BAUD * 16,
+                .uartclk        = OMAP24XX_BASE_BAUD * 16,
         }, {
                 .membase        = IO_ADDRESS(OMAP_UART3_BASE),
                 .mapbase        = OMAP_UART3_BASE,
@@ -54,7 +50,7 @@ static struct plat_serial8250_port serial_platform_data[] = {
                 .flags          = UPF_BOOT_AUTOCONF,
                 .iotype         = UPIO_MEM,
                 .regshift       = 2,
-                .uartclk        = OMAP16XX_BASE_BAUD * 16,
+                .uartclk        = OMAP24XX_BASE_BAUD * 16,
         }, {
                 .flags          = 0
         }
@@ -87,10 +83,27 @@ static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
         serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
 }
 
-void __init omap_serial_init()
+void omap_serial_enable_clocks(int enable)
+{
+        int i;
+        for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
+                if (uart_ick[i] && uart_fck[i]) {
+                        if (enable) {
+                                clk_enable(uart_ick[i]);
+                                clk_enable(uart_fck[i]);
+                        } else {
+                                clk_disable(uart_ick[i]);
+                                clk_disable(uart_fck[i]);
+                        }
+                }
+        }
+}
+
+void __init omap_serial_init(void)
 {
         int i;
         const struct omap_uart_config *info;
+        char name[16];
 
         /*
          * Make sure the serial ports are muxed on at this point.
@@ -98,8 +111,7 @@ void __init omap_serial_init()
          * if not needed.
          */
 
-        info = omap_get_config(OMAP_TAG_UART,
-                               struct omap_uart_config);
+        info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
 
         if (info == NULL)
                 return;
@@ -113,53 +125,21 @@ void __init omap_serial_init()
                         continue;
                 }
 
-                switch (i) {
-                case 0:
-                        uart1_ick = clk_get(NULL, "uart1_ick");
-                        if (IS_ERR(uart1_ick))
-                                printk("Could not get uart1_ick\n");
-                        else {
-                                clk_enable(uart1_ick);
-                        }
-
-                        uart1_fck = clk_get(NULL, "uart1_fck");
-                        if (IS_ERR(uart1_fck))
-                                printk("Could not get uart1_fck\n");
-                        else {
-                                clk_enable(uart1_fck);
-                        }
-                        break;
-                case 1:
-                        uart2_ick = clk_get(NULL, "uart2_ick");
-                        if (IS_ERR(uart2_ick))
-                                printk("Could not get uart2_ick\n");
-                        else {
-                                clk_enable(uart2_ick);
-                        }
-
-                        uart2_fck = clk_get(NULL, "uart2_fck");
-                        if (IS_ERR(uart2_fck))
-                                printk("Could not get uart2_fck\n");
-                        else {
-                                clk_enable(uart2_fck);
-                        }
-                        break;
-                case 2:
-                        uart3_ick = clk_get(NULL, "uart3_ick");
-                        if (IS_ERR(uart3_ick))
-                                printk("Could not get uart3_ick\n");
-                        else {
-                                clk_enable(uart3_ick);
-                        }
-
-                        uart3_fck = clk_get(NULL, "uart3_fck");
-                        if (IS_ERR(uart3_fck))
-                                printk("Could not get uart3_fck\n");
-                        else {
-                                clk_enable(uart3_fck);
-                        }
-                        break;
-                }
+                sprintf(name, "uart%d_ick", i+1);
+                uart_ick[i] = clk_get(NULL, name);
+                if (IS_ERR(uart_ick[i])) {
+                        printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
+                        uart_ick[i] = NULL;
+                } else
+                        clk_enable(uart_ick[i]);
+
+                sprintf(name, "uart%d_fck", i+1);
+                uart_fck[i] = clk_get(NULL, name);
+                if (IS_ERR(uart_fck[i])) {
+                        printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
+                        uart_fck[i] = NULL;
+                } else
+                        clk_enable(uart_fck[i]);
 
                 omap_serial_reset(p);
         }