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[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>
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@ -221,6 +221,15 @@ config PPC_EARLY_DEBUG_44x
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Select this to enable early debugging for IBM 44x chips via the
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inbuilt serial port.
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config PPC_EARLY_DEBUG_CPM
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bool "Early serial debugging for Freescale CPM-based serial ports"
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depends on SERIAL_CPM
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select PIN_TLB if PPC_8xx
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help
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Select this to enable early debugging for Freescale chips
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using a CPM-based serial port. This assumes that the bootwrapper
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has run, and set up the CPM in a particular way.
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endchoice
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config PPC_EARLY_DEBUG_44x_PHYSLOW
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@ -233,4 +242,16 @@ config PPC_EARLY_DEBUG_44x_PHYSHIGH
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depends PPC_EARLY_DEBUG_44x
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default "0x1"
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config PPC_EARLY_DEBUG_CPM_ADDR
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hex "CPM UART early debug transmit descriptor address"
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depends on PPC_EARLY_DEBUG_CPM
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default "0xfa202808" if PPC_EP88XC
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default "0xf0000808" if CPM2
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default "0xff002808" if CPM1
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help
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This specifies the address of the transmit descriptor
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used for early debug output. Because it is needed before
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platform probing is done, all platforms selected must
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share the same address.
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endmenu
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@ -149,6 +149,9 @@ __after_mmu_off:
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#if defined(CONFIG_BOOTX_TEXT)
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bl setup_disp_bat
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#endif
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#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
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bl setup_cpm_bat
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#endif
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/*
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* Call setup_cpu for CPU 0 and initialize 6xx Idle
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@ -1245,6 +1248,19 @@ setup_disp_bat:
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blr
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#endif /* CONFIG_BOOTX_TEXT */
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#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
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setup_cpm_bat:
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lis r8, 0xf000
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ori r8, r8, 0x002a
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mtspr SPRN_DBAT1L, r8
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lis r11, 0xf000
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ori r11, r11, (BL_1M << 2) | 2
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mtspr SPRN_DBAT1U, r11
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blr
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#endif
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#ifdef CONFIG_8260
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/* Jump into the system reset for the rom.
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* We first disable the MMU, and then jump to the ROM reset address.
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@ -54,6 +54,8 @@ void __init udbg_early_init(void)
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#elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
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/* PPC44x debug */
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udbg_init_44x_as1();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
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udbg_init_cpm();
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#endif
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}
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@ -3,6 +3,7 @@ config FADS
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config CPM1
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bool
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select CPM
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choice
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prompt "8xx Machine Type"
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@ -273,6 +273,7 @@ config QUICC_ENGINE
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config CPM2
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bool
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default n
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select CPM
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help
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The CPM2 (Communications Processor Module) is a coprocessor on
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embedded CPUs made by Freescale. Selecting this option means that
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@ -309,4 +310,7 @@ config FSL_ULI1575
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Freescale reference boards. The boards all use the ULI in pretty
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much the same way.
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config CPM
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bool
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endmenu
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@ -31,6 +31,7 @@ endif
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# Temporary hack until we have migrated to asm-powerpc
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ifeq ($(ARCH),powerpc)
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obj-$(CONFIG_CPM) += cpm_common.o
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obj-$(CONFIG_CPM2) += cpm2_common.o cpm2_pic.o
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obj-$(CONFIG_8xx) += mpc8xx_pic.o commproc.o
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obj-$(CONFIG_UCODE_PATCH) += micropatch.o
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46
arch/powerpc/sysdev/cpm_common.c
Normal file
46
arch/powerpc/sysdev/cpm_common.c
Normal file
@ -0,0 +1,46 @@
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/*
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* Common CPM code
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*
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* Author: Scott Wood <scottwood@freescale.com>
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*
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* Copyright 2007 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <asm/udbg.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <mm/mmu_decl.h>
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#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
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static u32 __iomem *cpm_udbg_txdesc =
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(u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
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static void udbg_putc_cpm(char c)
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{
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u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
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if (c == '\n')
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udbg_putc('\r');
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while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
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;
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out_8(txbuf, c);
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out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
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}
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void __init udbg_init_cpm(void)
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{
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if (cpm_udbg_txdesc) {
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#ifdef CONFIG_CPM2
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setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
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#endif
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udbg_putc = udbg_putc_cpm;
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}
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}
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#endif
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@ -48,6 +48,7 @@ extern void __init udbg_init_rtas_console(void);
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extern void __init udbg_init_debug_beat(void);
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extern void __init udbg_init_btext(void);
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extern void __init udbg_init_44x_as1(void);
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extern void __init udbg_init_cpm(void);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_UDBG_H */
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