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serial, mfd: don't hardcode the console

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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>
This commit is contained in:
Mika Westerberg
2011-11-10 13:18:09 +00:00
committed by Greg Kroah-Hartman
parent 66ef27c3fd
commit b82e324b3c
4 changed files with 21 additions and 17 deletions
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16
arch/x86/platform/mrst/early_printk_mrst.c
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@@ -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);