diff options
Diffstat (limited to 'arch/arm/mach-omap1/include/mach/debug-macro.S')
| -rw-r--r-- | arch/arm/mach-omap1/include/mach/debug-macro.S | 72 |
1 files changed, 65 insertions, 7 deletions
diff --git a/arch/arm/mach-omap1/include/mach/debug-macro.S b/arch/arm/mach-omap1/include/mach/debug-macro.S index 9ea12f29e0b..b6d9584544b 100644 --- a/arch/arm/mach-omap1/include/mach/debug-macro.S +++ b/arch/arm/mach-omap1/include/mach/debug-macro.S @@ -15,18 +15,76 @@ #include <plat/serial.h> + .pushsection .data +omap_uart_phys: .word 0x0 +omap_uart_virt: .word 0x0 + .popsection + + /* + * Note that this code won't work if the bootloader passes + * a wrong machine ID number in r1. To debug, just hardcode + * the desired UART phys and virt addresses temporarily into + * the omap_uart_phys and omap_uart_virt above. + */ .macro addruart, rx, tmp + + /* Use omap_uart_phys/virt if already configured */ +9: mrc p15, 0, \rx, c1, c0 + tst \rx, #1 @ MMU enabled? + ldreq \rx, =omap_uart_phys @ physical base address + ldrne \rx, =omap_uart_virt @ virtual base + ldr \rx, [\rx, #0] + cmp \rx, #0 @ is port configured? + bne 99f @ already configured + + /* Check 7XX UART1 scratchpad register for uart to use */ + mrc p15, 0, \rx, c1, c0 + tst \rx, #1 @ MMU enabled? + moveq \rx, #0xff000000 @ physical base address + movne \rx, #0xfe000000 @ virtual base + orr \rx, \rx, #0x00fb0000 @ OMAP1UART1 + ldrb \rx, [\rx, #(UART_SCR << OMAP7XX_PORT_SHIFT)] + cmp \rx, #0 @ anything in 7XX scratchpad? + bne 10f @ found 7XX uart + + /* Check 15xx/16xx UART1 scratchpad register for uart to use */ mrc p15, 0, \rx, c1, c0 tst \rx, #1 @ MMU enabled? moveq \rx, #0xff000000 @ physical base address movne \rx, #0xfe000000 @ virtual base - orr \rx, \rx, #0x00fb0000 -#ifdef CONFIG_OMAP_LL_DEBUG_UART3 - orr \rx, \rx, #0x00009000 @ UART 3 -#endif -#if defined(CONFIG_OMAP_LL_DEBUG_UART2) || defined(CONFIG_OMAP_LL_DEBUG_UART3) - orr \rx, \rx, #0x00000800 @ UART 2 & 3 -#endif + orr \rx, \rx, #0x00fb0000 @ OMAP1UART1 + ldrb \rx, [\rx, #(UART_SCR << OMAP_PORT_SHIFT)] + + /* Select the UART to use based on the UART1 scratchpad value */ +10: cmp \rx, #0 @ no port configured? + beq 11f @ if none, try to use UART1 + cmp \rx, #OMAP1UART1 + beq 11f @ configure OMAP1UART1 + cmp \rx, #OMAP1UART2 + beq 12f @ configure OMAP1UART2 + cmp \rx, #OMAP1UART3 + beq 13f @ configure OMAP2UART3 + + /* Configure the UART offset from the phys/virt base */ +11: mov \rx, #0x00fb0000 @ OMAP1UART1 + b 98f +12: mov \rx, #0x00fb0000 @ OMAP1UART1 + orr \rx, \rx, #0x00000800 @ OMAP1UART2 + b 98f +13: mov \rx, #0x00fb0000 @ OMAP1UART1 + orr \rx, \rx, #0x00000800 @ OMAP1UART2 + orr \rx, \rx, #0x00009000 @ OMAP1UART3 + + /* Store both phys and virt address for the uart */ +98: add \rx, \rx, #0xff000000 @ phys base + ldr \tmp, =omap_uart_phys + str \rx, [\tmp, #0] + sub \rx, \rx, #0xff000000 @ phys base + add \rx, \rx, #0xfe000000 @ virt base + ldr \tmp, =omap_uart_virt + str \rx, [\tmp, #0] + b 9b +99: .endm .macro senduart,rd,rx |