[POWERPC] Add early debug console for CPM serial ports.
This code assumes that the ports have been previously set up, with
buffers in DPRAM.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index c38bc22..f4e5d22 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -221,6 +221,15 @@
Select this to enable early debugging for IBM 44x chips via the
inbuilt serial port.
+config PPC_EARLY_DEBUG_CPM
+ bool "Early serial debugging for Freescale CPM-based serial ports"
+ depends on SERIAL_CPM
+ select PIN_TLB if PPC_8xx
+ help
+ Select this to enable early debugging for Freescale chips
+ using a CPM-based serial port. This assumes that the bootwrapper
+ has run, and set up the CPM in a particular way.
+
endchoice
config PPC_EARLY_DEBUG_44x_PHYSLOW
@@ -233,4 +242,16 @@
depends PPC_EARLY_DEBUG_44x
default "0x1"
+config PPC_EARLY_DEBUG_CPM_ADDR
+ hex "CPM UART early debug transmit descriptor address"
+ depends on PPC_EARLY_DEBUG_CPM
+ default "0xfa202808" if PPC_EP88XC
+ default "0xf0000808" if CPM2
+ default "0xff002808" if CPM1
+ help
+ This specifies the address of the transmit descriptor
+ used for early debug output. Because it is needed before
+ platform probing is done, all platforms selected must
+ share the same address.
+
endmenu
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index c86c626..d83f04e 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -149,6 +149,9 @@
#if defined(CONFIG_BOOTX_TEXT)
bl setup_disp_bat
#endif
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+ bl setup_cpm_bat
+#endif
/*
* Call setup_cpu for CPU 0 and initialize 6xx Idle
@@ -1245,6 +1248,19 @@
blr
#endif /* CONFIG_BOOTX_TEXT */
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+setup_cpm_bat:
+ lis r8, 0xf000
+ ori r8, r8, 0x002a
+ mtspr SPRN_DBAT1L, r8
+
+ lis r11, 0xf000
+ ori r11, r11, (BL_1M << 2) | 2
+ mtspr SPRN_DBAT1U, r11
+
+ blr
+#endif
+
#ifdef CONFIG_8260
/* Jump into the system reset for the rom.
* We first disable the MMU, and then jump to the ROM reset address.
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 0f9b4ea..d723070 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -54,6 +54,8 @@
#elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
/* PPC44x debug */
udbg_init_44x_as1();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
+ udbg_init_cpm();
#endif
}
diff --git a/arch/powerpc/platforms/8xx/Kconfig b/arch/powerpc/platforms/8xx/Kconfig
index 39bb8c5..8ecd01a 100644
--- a/arch/powerpc/platforms/8xx/Kconfig
+++ b/arch/powerpc/platforms/8xx/Kconfig
@@ -3,6 +3,7 @@
config CPM1
bool
+ select CPM
choice
prompt "8xx Machine Type"
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 8a62ca5..cc6013f 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -273,6 +273,7 @@
config CPM2
bool
default n
+ select CPM
help
The CPM2 (Communications Processor Module) is a coprocessor on
embedded CPUs made by Freescale. Selecting this option means that
@@ -309,4 +310,7 @@
Freescale reference boards. The boards all use the ULI in pretty
much the same way.
+config CPM
+ bool
+
endmenu
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index 592c17e..52e93bc 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -31,6 +31,7 @@
# Temporary hack until we have migrated to asm-powerpc
ifeq ($(ARCH),powerpc)
+obj-$(CONFIG_CPM) += cpm_common.o
obj-$(CONFIG_CPM2) += cpm2_common.o cpm2_pic.o
obj-$(CONFIG_8xx) += mpc8xx_pic.o commproc.o
obj-$(CONFIG_UCODE_PATCH) += micropatch.o
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
new file mode 100644
index 0000000..9daa6ac
--- /dev/null
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -0,0 +1,46 @@
+/*
+ * Common CPM code
+ *
+ * Author: Scott Wood <scottwood@freescale.com>
+ *
+ * Copyright 2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <asm/udbg.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <mm/mmu_decl.h>
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+static u32 __iomem *cpm_udbg_txdesc =
+ (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
+
+static void udbg_putc_cpm(char c)
+{
+ u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
+
+ if (c == '\n')
+ udbg_putc('\r');
+
+ while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
+ ;
+
+ out_8(txbuf, c);
+ out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
+}
+
+void __init udbg_init_cpm(void)
+{
+ if (cpm_udbg_txdesc) {
+#ifdef CONFIG_CPM2
+ setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
+#endif
+ udbg_putc = udbg_putc_cpm;
+ }
+}
+#endif
diff --git a/include/asm-powerpc/udbg.h b/include/asm-powerpc/udbg.h
index ce9d82f..a9e0b0e 100644
--- a/include/asm-powerpc/udbg.h
+++ b/include/asm-powerpc/udbg.h
@@ -48,6 +48,7 @@
extern void __init udbg_init_debug_beat(void);
extern void __init udbg_init_btext(void);
extern void __init udbg_init_44x_as1(void);
+extern void __init udbg_init_cpm(void);
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_UDBG_H */