Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9b41fcb0eb890009f9de3df76fcdb2ba77314a4b
Commit: 9b41fcb0eb890009f9de3df76fcdb2ba77314a4b
Parent: e4533b243e5e0c3a26287a902a1ed0f8f5b1cec0
Author: Dale Farnsworth <[EMAIL PROTECTED]>
AuthorDate: Tue May 15 05:52:22 2007 +1000
Committer: Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Sat Sep 22 14:49:21 2007 +1000
[POWERPC] Add Marvell mv64x60 udbg putc/getc functions
Commit 69331af, "Fixes and cleanups for earlyprintk aka boot console",
resulted in printk output prior to the initialization of the mpsc
console driver not being printed. That commit causes the mpsc's
CON_PRINTBUFFER flag to be cleared since udbg should have printed
the previous output.
I guess we can no longer ignore udbg. :)
This patch provides udbg_putc() and udbg_getc() functions for the
Marvell mv64x60 chips. These functions are enabled if an mv64x60
port is to be used as the console as determined from the device tree.
Signed-off-by: Dale Farnsworth <[EMAIL PROTECTED]>
Acked-by: Mark A. Greer <[EMAIL PROTECTED]>
Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
---
arch/powerpc/platforms/embedded6xx/prpmc2800.c | 1 +
arch/powerpc/sysdev/Makefile | 3 +-
arch/powerpc/sysdev/mv64x60.h | 1 +
arch/powerpc/sysdev/mv64x60_udbg.c | 152 ++++++++++++++++++++++++
4 files changed, 156 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/platforms/embedded6xx/prpmc2800.c
b/arch/powerpc/platforms/embedded6xx/prpmc2800.c
index 5467564..e484cac 100644
--- a/arch/powerpc/platforms/embedded6xx/prpmc2800.c
+++ b/arch/powerpc/platforms/embedded6xx/prpmc2800.c
@@ -151,6 +151,7 @@ define_machine(prpmc2800){
.name = prpmc2800_platform_name,
.probe = prpmc2800_probe,
.setup_arch = prpmc2800_setup_arch,
+ .init_early = mv64x60_init_early,
.show_cpuinfo = prpmc2800_show_cpuinfo,
.init_IRQ = mv64x60_init_irq,
.get_irq = mv64x60_get_irq,
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index 08ce31e..ed41dc0 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -16,7 +16,8 @@ obj-$(CONFIG_FSL_PCI) += fsl_pci.o
obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o
obj-$(CONFIG_QUICC_ENGINE) += qe_lib/
mv64x60-$(CONFIG_PCI) += mv64x60_pci.o
-obj-$(CONFIG_MV64X60) += $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o
+obj-$(CONFIG_MV64X60) += $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o \
+ mv64x60_udbg.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc_cmos_setup.o
obj-$(CONFIG_AXON_RAM) += axonram.o
diff --git a/arch/powerpc/sysdev/mv64x60.h b/arch/powerpc/sysdev/mv64x60.h
index 2ff0b4e..4f618fa 100644
--- a/arch/powerpc/sysdev/mv64x60.h
+++ b/arch/powerpc/sysdev/mv64x60.h
@@ -7,5 +7,6 @@ extern void __init mv64x60_init_irq(void);
extern unsigned int mv64x60_get_irq(void);
extern void __init mv64x60_pci_init(void);
+extern void __init mv64x60_init_early(void);
#endif /* __MV64X60_H__ */
diff --git a/arch/powerpc/sysdev/mv64x60_udbg.c
b/arch/powerpc/sysdev/mv64x60_udbg.c
new file mode 100644
index 0000000..367e7b1
--- /dev/null
+++ b/arch/powerpc/sysdev/mv64x60_udbg.c
@@ -0,0 +1,152 @@
+/*
+ * udbg serial input/output routines for the Marvell MV64x60 (Discovery).
+ *
+ * Author: Dale Farnsworth <[EMAIL PROTECTED]>
+ *
+ * 2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+
+#include <sysdev/mv64x60.h>
+
+#define MPSC_0_CR1_OFFSET 0x000c
+
+#define MPSC_0_CR2_OFFSET 0x0010
+#define MPSC_CHR_2_TCS (1 << 9)
+
+#define MPSC_0_CHR_10_OFFSET 0x0030
+
+#define MPSC_INTR_CAUSE_OFF_0 0x0004
+#define MPSC_INTR_CAUSE_OFF_1 0x000c
+#define MPSC_INTR_CAUSE_RCC (1<<6)
+
+static void __iomem *mpsc_base;
+static void __iomem *mpsc_intr_cause;
+
+static void mv64x60_udbg_putc(char c)
+{
+ if (c == '\n')
+ mv64x60_udbg_putc('\r');
+
+ while(in_le32(mpsc_base + MPSC_0_CR2_OFFSET) & MPSC_CHR_2_TCS)
+ ;
+ out_le32(mpsc_base + MPSC_0_CR1_OFFSET, c);
+ out_le32(mpsc_base + MPSC_0_CR2_OFFSET, MPSC_CHR_2_TCS);
+}
+
+static int mv64x60_udbg_testc(void)
+{
+ return (in_le32(mpsc_intr_cause) & MPSC_INTR_CAUSE_RCC) != 0;
+}
+
+static int mv64x60_udbg_getc(void)
+{
+ int cause = 0;
+ int c;
+
+ while (!mv64x60_udbg_testc())
+ ;
+
+ c = in_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2);
+ out_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2, c);
+ out_le32(mpsc_intr_cause, cause & ~MPSC_INTR_CAUSE_RCC);
+ return c;
+}
+
+static int mv64x60_udbg_getc_poll(void)
+{
+ if (!mv64x60_udbg_testc())
+ return -1;
+
+ return mv64x60_udbg_getc();
+}
+
+static void mv64x60_udbg_init(void)
+{
+ struct device_node *np, *mpscintr, *stdout = NULL;
+ const char *path;
+ const phandle *ph;
+ struct resource r[2];
+ const int *block_index;
+ int intr_cause_offset;
+ int err;
+
+ path = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (!path)
+ return;
+
+ stdout = of_find_node_by_path(path);
+ if (!stdout)
+ return;
+
+ for (np = NULL;
+ (np = of_find_compatible_node(np, "serial", "marvell,mpsc")); )
+ if (np == stdout)
+ break;
+
+ of_node_put(stdout);
+ if (!np)
+ return;
+
+ block_index = of_get_property(np, "block-index", NULL);
+ if (!block_index)
+ goto error;
+
+ switch (*block_index) {
+ case 0:
+ intr_cause_offset = MPSC_INTR_CAUSE_OFF_0;
+ break;
+ case 1:
+ intr_cause_offset = MPSC_INTR_CAUSE_OFF_1;
+ break;
+ default:
+ goto error;
+ }
+
+ err = of_address_to_resource(np, 0, &r[0]);
+ if (err)
+ goto error;
+
+ ph = of_get_property(np, "mpscintr", NULL);
+ mpscintr = of_find_node_by_phandle(*ph);
+ if (!mpscintr)
+ goto error;
+
+ err = of_address_to_resource(mpscintr, 0, &r[1]);
+ of_node_put(mpscintr);
+ if (err)
+ goto error;
+
+ of_node_put(np);
+
+ mpsc_base = ioremap(r[0].start, r[0].end - r[0].start + 1);
+ if (!mpsc_base)
+ return;
+
+ mpsc_intr_cause = ioremap(r[1].start, r[1].end - r[1].start + 1);
+ if (!mpsc_intr_cause) {
+ iounmap(mpsc_base);
+ return;
+ }
+ mpsc_intr_cause += intr_cause_offset;
+
+ udbg_putc = mv64x60_udbg_putc;
+ udbg_getc = mv64x60_udbg_getc;
+ udbg_getc_poll = mv64x60_udbg_getc_poll;
+
+ return;
+
+error:
+ of_node_put(np);
+}
+
+void mv64x60_init_early(void)
+{
+ mv64x60_udbg_init();
+}
-
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