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Davinci: generalized debug macros

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This patch adopts a debug uart selection similar to the OMAP model.  During
the boot process, the uncompress code determines the physical and virtual base
addresses of the board-specific debug uart.  These addresses are then passed
on to the in-kernel debug macros through a small chunk of memory placed just
below the page tables (@0x80003ff8).

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Cyril Chemparathy
2010-05-18 12:51:17 -04:00
committed by Kevin Hilman
parent 7e27d6e778
commit dc2eb76c40
3 changed files with 111 additions and 32 deletions
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50
arch/arm/mach-davinci/include/mach/debug-macro.S
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@@ -17,22 +17,50 @@
*/
#include <linux/serial_reg.h>
#include <asm/memory.h>
#include <mach/serial.h>
#define UART_SHIFT 2
.pushsection .data
davinci_uart_phys: .word 0
davinci_uart_virt: .word 0
.popsection
.macro addruart, rx, tmp
/* Use davinci_uart_phys/virt if already configured */
10: mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
ldreq \rx, =__virt_to_phys(davinci_uart_phys)
ldrne \rx, =davinci_uart_virt
ldr \rx, [\rx]
cmp \rx, #0 @ is port configured?
bne 99f @ already configured
mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
moveq \rx, #0x01000000 @ physical base address
movne \rx, #0xfe000000 @ virtual base
#if defined(CONFIG_ARCH_DAVINCI_DA8XX) && defined(CONFIG_ARCH_DAVINCI_DMx)
#error Cannot enable DaVinci and DA8XX platforms concurrently
#elif defined(CONFIG_MACH_DAVINCI_DA830_EVM) || \
defined(CONFIG_MACH_DAVINCI_DA850_EVM)
orr \rx, \rx, #0x00d00000 @ physical base address
orr \rx, \rx, #0x0000d000 @ of UART 2
#else
orr \rx, \rx, #0x00c20000 @ UART 0
#endif
/* Copy uart phys address from decompressor uart info */
ldreq \tmp, =__virt_to_phys(davinci_uart_phys)
ldrne \tmp, =davinci_uart_phys
ldreq \rx, =DAVINCI_UART_INFO
ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO)
ldr \rx, [\rx, #0]
str \rx, [\tmp]
/* Copy uart virt address from decompressor uart info */
ldreq \tmp, =__virt_to_phys(davinci_uart_virt)
ldrne \tmp, =davinci_uart_virt
ldreq \rx, =DAVINCI_UART_INFO
ldrne \rx, =__phys_to_virt(DAVINCI_UART_INFO)
ldr \rx, [\rx, #4]
str \rx, [\tmp]
b 10b
99:
.endm
.macro senduart,rd,rx