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powerpc: Add early debug for WSP platforms

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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>
This commit is contained in:
Jack Miller 2011-04-14 22:32:08 +00:00 committed by Benjamin Herrenschmidt
parent a1d0d98daf
commit a0496d450a
6 changed files with 85 additions and 0 deletions
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5
arch/powerpc/Kconfig.debug
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@ -267,6 +267,11 @@ config PPC_EARLY_DEBUG_USBGECKO
Select this to enable early debugging for Nintendo GameCube/Wii
consoles via an external USB Gecko adapter.
config PPC_EARLY_DEBUG_WSP
bool "Early debugging via WSP's internal UART"
depends on PPC_WSP
select PPC_UDBG_16550
endchoice
config PPC_EARLY_DEBUG_44x_PHYSLOW

9
arch/powerpc/include/asm/reg_a2.h
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@ -110,6 +110,15 @@
#define TLB1_UR ASM_CONST(0x0000000000000002)
#define TLB1_SR ASM_CONST(0x0000000000000001)
#ifdef CONFIG_PPC_EARLY_DEBUG_WSP
#define WSP_UART_PHYS 0xffc000c000
/* This needs to be careful chosen to hit a !0 congruence class
* in the TLB since we bolt it in way 3, which is already occupied
* by our linear mapping primary bolted entry in CC 0.
*/
#define WSP_UART_VIRT 0xf000000000001000
#endif
/* A2 erativax attributes definitions */
#define ERATIVAX_RS_IS_ALL 0x000
#define ERATIVAX_RS_IS_TID 0x040

1
arch/powerpc/include/asm/udbg.h
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@ -52,6 +52,7 @@ extern void __init udbg_init_44x_as1(void);
extern void __init udbg_init_40x_realmode(void);
extern void __init udbg_init_cpm(void);
extern void __init udbg_init_usbgecko(void);
extern void __init udbg_init_wsp(void);
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_UDBG_H */

17
arch/powerpc/kernel/exceptions-64e.S
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@ -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

2
arch/powerpc/kernel/udbg.c
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@ -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

51
arch/powerpc/kernel/udbg_16550.c
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@ -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 */