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>

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 69651cf0830594d7e6638f9fc06885cbdc7694b1..78ab2be7024192aca1fe082d48be958db259693a 100644 (file)
--- 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);
        }

diff --git a/arch/arm/plat-omap/include/mach/common.h b/arch/arm/plat-omap/include/mach/common.h
index 06093112b665c6b2b77330647f11938cfe898825..515c6286582c910e97ed13c57228d7ff89c25a6a 100644 (file)
--- a/arch/arm/plat-omap/include/mach/common.h
+++ b/arch/arm/plat-omap/include/mach/common.h
@@ -34,6 +34,7 @@ struct sys_timer;
 extern void omap_map_common_io(void);
 extern struct sys_timer omap_timer;
 extern void omap_serial_init(void);
+extern void omap_serial_enable_clocks(int enable);
 #ifdef CONFIG_I2C_OMAP
 extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
                                 struct i2c_board_info const *info,

diff --git a/arch/arm/plat-omap/include/mach/serial.h b/arch/arm/plat-omap/include/mach/serial.h
index 515b89bee96663a4fa339bf55adeb9483fed7318..8a676a04be481b1630cb7d0fa61cc87b00498aa4 100644 (file)
--- a/arch/arm/plat-omap/include/mach/serial.h
+++ b/arch/arm/plat-omap/include/mach/serial.h
@@ -20,11 +20,17 @@
 #define OMAP_UART1_BASE                0x4806a000
 #define OMAP_UART2_BASE                0x4806c000
 #define OMAP_UART3_BASE                0x4806e000
+#elif defined(CONFIG_ARCH_OMAP3)
+/* OMAP3 serial ports */
+#define OMAP_UART1_BASE                0x4806a000
+#define OMAP_UART2_BASE                0x4806c000
+#define OMAP_UART3_BASE                0x49020000
 #endif
 
 #define OMAP_MAX_NR_PORTS      3
 #define OMAP1510_BASE_BAUD     (12000000/16)
 #define OMAP16XX_BASE_BAUD     (48000000/16)
+#define OMAP24XX_BASE_BAUD     (48000000/16)
 
 #define is_omap_port(pt)       ({int __ret = 0;                        \
                        if ((pt)->port.mapbase == OMAP_UART1_BASE ||    \