diff options
| author | Jack Miller <jack@codezen.org> | 2011-04-14 22:32:08 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-05-06 13:32:41 +1000 |
| commit | a0496d450ab8c17f6c4d86979b1f6ba486fe9365 (patch) | |
| tree | accb4fa5d2695770a1c6992f7437df57e9f14868 /arch/powerpc/kernel | |
| parent | a1d0d98daf6ce580d017a43b09fe30a375cde3e8 (diff) | |
powerpc: Add early debug for WSP platforms
Signed-off-by: Jack Miller <jack@codezen.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 17 | ||||
| -rw-r--r-- | arch/powerpc/kernel/udbg.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/udbg_16550.c | 51 |
3 files changed, 70 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index c98e9d260621..4d0abb4930a1 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -17,6 +17,7 @@ #include <asm/cputable.h> #include <asm/setup.h> #include <asm/thread_info.h> +#include <asm/reg_a2.h> #include <asm/exception-64e.h> #include <asm/bug.h> #include <asm/irqflags.h> @@ -951,6 +952,22 @@ a2_tlbinit_after_linear_map: .globl a2_tlbinit_after_iprot_flush a2_tlbinit_after_iprot_flush: +#ifdef CONFIG_PPC_EARLY_DEBUG_WSP + /* Now establish early debug mappings if applicable */ + /* Restore the MAS0 we used for linear mapping load */ + mtspr SPRN_MAS0,r11 + + lis r3,(MAS1_VALID | MAS1_IPROT)@h + ori r3,r3,(BOOK3E_PAGESZ_4K << MAS1_TSIZE_SHIFT) + mtspr SPRN_MAS1,r3 + LOAD_REG_IMMEDIATE(r3, WSP_UART_VIRT | MAS2_I | MAS2_G) + mtspr SPRN_MAS2,r3 + LOAD_REG_IMMEDIATE(r3, WSP_UART_PHYS | MAS3_SR | MAS3_SW) + mtspr SPRN_MAS7_MAS3,r3 + /* re-use the MAS8 value from the linear mapping */ + tlbwe +#endif /* CONFIG_PPC_EARLY_DEBUG_WSP */ + PPC_TLBILX(0,0,0) sync isync diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index e39cad83c884..23d65abbedce 100644 --- a/arch/powerpc/kernel/udbg.c +++ b/arch/powerpc/kernel/udbg.c @@ -62,6 +62,8 @@ void __init udbg_early_init(void) udbg_init_cpm(); #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO) udbg_init_usbgecko(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_WSP) + udbg_init_wsp(); #endif #ifdef CONFIG_PPC_EARLY_DEBUG diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c index baa33a7517bc..6837f839ab78 100644 --- a/arch/powerpc/kernel/udbg_16550.c +++ b/arch/powerpc/kernel/udbg_16550.c @@ -11,6 +11,7 @@ #include <linux/types.h> #include <asm/udbg.h> #include <asm/io.h> +#include <asm/reg_a2.h> extern u8 real_readb(volatile u8 __iomem *addr); extern void real_writeb(u8 data, volatile u8 __iomem *addr); @@ -298,3 +299,53 @@ void __init udbg_init_40x_realmode(void) udbg_getc_poll = NULL; } #endif /* CONFIG_PPC_EARLY_DEBUG_40x */ + +#ifdef CONFIG_PPC_EARLY_DEBUG_WSP +static void udbg_wsp_flush(void) +{ + if (udbg_comport) { + while ((readb(&udbg_comport->lsr) & LSR_THRE) == 0) + /* wait for idle */; + } +} + +static void udbg_wsp_putc(char c) +{ + if (udbg_comport) { + if (c == '\n') + udbg_wsp_putc('\r'); + udbg_wsp_flush(); + writeb(c, &udbg_comport->thr); eieio(); + } +} + +static int udbg_wsp_getc(void) +{ + if (udbg_comport) { + while ((readb(&udbg_comport->lsr) & LSR_DR) == 0) + ; /* wait for char */ + return readb(&udbg_comport->rbr); + } + return -1; +} + +static int udbg_wsp_getc_poll(void) +{ + if (udbg_comport) + if (readb(&udbg_comport->lsr) & LSR_DR) + return readb(&udbg_comport->rbr); + return -1; +} + +void __init udbg_init_wsp(void) +{ + udbg_comport = (struct NS16550 __iomem *)WSP_UART_VIRT; + + udbg_init_uart(udbg_comport, 57600, 50000000); + + udbg_putc = udbg_wsp_putc; + udbg_flush = udbg_wsp_flush; + udbg_getc = udbg_wsp_getc; + udbg_getc_poll = udbg_wsp_getc_poll; +} +#endif /* CONFIG_PPC_EARLY_DEBUG_WSP */ |