serial, mfd: don't hardcode the console
Add support to specify which HSU port to use as an early console. This can
be selected by passing "earlyprintk=hsu<n>" on the kernel command line. By
default port 0 is still used.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/arch/x86/include/asm/mrst.h b/arch/x86/include/asm/mrst.h
index 719f00b..4707760 100644
--- a/arch/x86/include/asm/mrst.h
+++ b/arch/x86/include/asm/mrst.h
@@ -51,7 +51,7 @@
extern void mrst_early_console_init(void);
extern struct console early_hsu_console;
-extern void hsu_early_console_init(void);
+extern void hsu_early_console_init(const char *);
extern void intel_scu_devices_create(void);
extern void intel_scu_devices_destroy(void);
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
index cd28a35..9d42a52 100644
--- a/arch/x86/kernel/early_printk.c
+++ b/arch/x86/kernel/early_printk.c
@@ -247,7 +247,7 @@
}
if (!strncmp(buf, "hsu", 3)) {
- hsu_early_console_init();
+ hsu_early_console_init(buf + 3);
early_console_register(&early_hsu_console, keep);
}
#endif
diff --git a/arch/x86/platform/mrst/early_printk_mrst.c b/arch/x86/platform/mrst/early_printk_mrst.c
index 25bfdbb..3c6e328 100644
--- a/arch/x86/platform/mrst/early_printk_mrst.c
+++ b/arch/x86/platform/mrst/early_printk_mrst.c
@@ -245,16 +245,24 @@
* 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);