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Diffstat (limited to 'arch/x86/platform/mrst/early_printk_mrst.c')
-rw-r--r--arch/x86/platform/mrst/early_printk_mrst.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/x86/platform/mrst/early_printk_mrst.c b/arch/x86/platform/mrst/early_printk_mrst.c
index 25bfdbb5b13..3c6e328483c 100644
--- a/arch/x86/platform/mrst/early_printk_mrst.c
+++ b/arch/x86/platform/mrst/early_printk_mrst.c
@@ -245,16 +245,24 @@ struct console early_mrst_console = {
* Following is the early console based on Medfield HSU (High
* Speed UART) device.
*/
-#define HSU_PORT2_PADDR 0xffa28180
+#define HSU_PORT_BASE 0xffa28080
static void __iomem *phsu;
-void hsu_early_console_init(void)
+void hsu_early_console_init(const char *s)
{
+ unsigned long paddr, port = 0;
u8 lcr;
- phsu = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE,
- HSU_PORT2_PADDR);
+ /*
+ * Select the early HSU console port if specified by user in the
+ * kernel command line.
+ */
+ if (*s && !kstrtoul(s, 10, &port))
+ port = clamp_val(port, 0, 2);
+
+ paddr = HSU_PORT_BASE + port * 0x80;
+ phsu = (void *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr);
/* Disable FIFO */
writeb(0x0, phsu + UART_FCR);