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authorMika Westerberg <mika.westerberg@linux.intel.com>2011-11-10 13:18:09 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-15 15:50:30 -0800
commitb82e324b3c46a554595c12b45465d1943a57326c (patch)
treedd74e36cd1d04948ee76dcfbdb9894190e689a40
parent66ef27c3fd0e91038029054c862c9439be5137c1 (diff)
downloadop-kernel-dev-b82e324b3c46a554595c12b45465d1943a57326c.zip
op-kernel-dev-b82e324b3c46a554595c12b45465d1943a57326c.tar.gz
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>
-rw-r--r--arch/x86/include/asm/mrst.h2
-rw-r--r--arch/x86/kernel/early_printk.c2
-rw-r--r--arch/x86/platform/mrst/early_printk_mrst.c16
-rw-r--r--drivers/tty/serial/mfd.c18
4 files changed, 21 insertions, 17 deletions
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 struct console early_mrst_console;
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 @@ static int __init setup_early_printk(char *buf)
}
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 @@ 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);
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index 286c386..565f3fe 100644
--- a/drivers/tty/serial/mfd.c
+++ b/drivers/tty/serial/mfd.c
@@ -1156,7 +1156,6 @@ serial_hsu_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
- int ret;
if (co->index == -1 || co->index >= serial_hsu_reg.nr)
co->index = 0;
@@ -1167,9 +1166,7 @@ serial_hsu_console_setup(struct console *co, char *options)
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
- ret = uart_set_options(&up->port, co, baud, parity, bits, flow);
-
- return ret;
+ return uart_set_options(&up->port, co, baud, parity, bits, flow);
}
static struct console serial_hsu_console = {
@@ -1178,9 +1175,13 @@ static struct console serial_hsu_console = {
.device = uart_console_device,
.setup = serial_hsu_console_setup,
.flags = CON_PRINTBUFFER,
- .index = 2,
+ .index = -1,
.data = &serial_hsu_reg,
};
+
+#define SERIAL_HSU_CONSOLE (&serial_hsu_console)
+#else
+#define SERIAL_HSU_CONSOLE NULL
#endif
struct uart_ops serial_hsu_pops = {
@@ -1210,6 +1211,7 @@ static struct uart_driver serial_hsu_reg = {
.major = TTY_MAJOR,
.minor = 128,
.nr = 3,
+ .cons = SERIAL_HSU_CONSOLE,
};
#ifdef CONFIG_PM
@@ -1344,12 +1346,6 @@ static int serial_hsu_probe(struct pci_dev *pdev,
}
uart_add_one_port(&serial_hsu_reg, &uport->port);
-#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
- if (index == 2) {
- register_console(&serial_hsu_console);
- uport->port.cons = &serial_hsu_console;
- }
-#endif
pci_set_drvdata(pdev, uport);
}
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