1 files changed, 25 insertions, 7 deletions

diff --git a/arch/arm/mach-davinci/serial.c b/arch/arm/mach-davinci/serial.c
index 709e1a90ec2a..81af42ca29d2 100644
--- a/arch/arm/mach-davinci/serial.c
+++ b/arch/arm/mach-davinci/serial.c
@@ -35,14 +35,20 @@ static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
                                            int offset)
 {
         offset <<= up->regshift;
-        return (unsigned int)__raw_readl(IO_ADDRESS(up->mapbase) + offset);
+
+        WARN_ONCE(!up->membase, "unmapped read: uart[%d]\n", offset);
+
+        return (unsigned int)__raw_readl(up->membase + offset);
 }
 
 static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
                                     int value)
 {
         offset <<= p->regshift;
-        __raw_writel(value, IO_ADDRESS(p->mapbase) + offset);
+
+        WARN_ONCE(!p->membase, "unmapped write: uart[%d]\n", offset);
+
+        __raw_writel(value, p->membase + offset);
 }
 
 static void __init davinci_serial_reset(struct plat_serial8250_port *p)
@@ -83,14 +89,26 @@ int __init davinci_serial_init(struct davinci_uart_config *info)
 
                 sprintf(name, "uart%d", i);
                 uart_clk = clk_get(dev, name);
-                if (IS_ERR(uart_clk))
+                if (IS_ERR(uart_clk)) {
                         printk(KERN_ERR "%s:%d: failed to get UART%d clock\n",
                                         __func__, __LINE__, i);
-                else {
-                        clk_enable(uart_clk);
-                        p->uartclk = clk_get_rate(uart_clk);
-                        davinci_serial_reset(p);
+                        continue;
                 }
+
+                clk_enable(uart_clk);
+                p->uartclk = clk_get_rate(uart_clk);
+
+                if (!p->membase && p->mapbase) {
+                        p->membase = ioremap(p->mapbase, SZ_4K);
+
+                        if (p->membase)
+                                p->flags &= ~UPF_IOREMAP;
+                        else
+                                pr_err("uart regs ioremap failed\n");
+                }
+
+                if (p->membase)
+                        davinci_serial_reset(p);
         }
 
         return platform_device_register(soc_info->serial_dev);