diff options
| author | Cyril Chemparathy <cyril@ti.com> | 2010-05-18 18:51:17 +0200 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-06-21 21:48:30 +0200 |
| commit | dc2eb76c40590a3c080294d1fbd000c8f70d88a9 (patch) | |
| tree | 8c7bccdd0eb4dfba763cd19216d8c0a13dfb5d51 /arch/arm/mach-davinci/include/mach/debug-macro.S | |
| parent | Linux 2.6.35-rc3 (diff) | |
| download | linux-dc2eb76c40590a3c080294d1fbd000c8f70d88a9.tar.xz linux-dc2eb76c40590a3c080294d1fbd000c8f70d88a9.zip | |
Davinci: generalized debug macros
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>
Diffstat (limited to 'arch/arm/mach-davinci/include/mach/debug-macro.S')
| -rw-r--r-- | arch/arm/mach-davinci/include/mach/debug-macro.S | 50 |
1 files changed, 39 insertions, 11 deletions
diff --git a/arch/arm/mach-davinci/include/mach/debug-macro.S b/arch/arm/mach-davinci/include/mach/debug-macro.S index 3cd93a801d9b..f761dfdb8689 100644 --- a/arch/arm/mach-davinci/include/mach/debug-macro.S +++ b/arch/arm/mach-davinci/include/mach/debug-macro.S @@ -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 |