omap: Fix DEBUG_LL uart to access phys addr when MMU isn't enable

Now we use a memory address to store the debug port info, So we need
to read/write this address when we choose DEBUG_LL. When MMU isn't
enable(I.E. the begining part of init stage of the linux kernel boot),
we need to access physical address instead of virtual address,
otherwise the kernel will crash.

Signed-off-by: Jason Wang <jason77.wang@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap1/include/mach/debug-macro.S b/arch/arm/mach-omap1/include/mach/debug-macro.S
index e8a8cf3..671408e 100644 (file)
--- a/arch/arm/mach-omap1/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap1/include/mach/debug-macro.S
@@ -33,7 +33,7 @@ omap_uart_virt:       .word   0x0
                /* 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
+               ldreq   \rx, =__virt_to_phys(omap_uart_phys)    @ physical base address
                ldrne   \rx, =omap_uart_virt    @ virtual base
                ldr     \rx, [\rx, #0]
                cmp     \rx, #0                 @ is port configured?
@@ -68,11 +68,15 @@ omap_uart_virt:     .word   0x0
 
                /* Store both phys and virt address for the uart */
 98:            add     \rx, \rx, #0xff000000   @ phys base
-               ldr     \tmp, =omap_uart_phys
+               mrc     p15, 0, \tmp, c1, c0
+               tst     \tmp, #1                @ MMU enabled?
+               ldreq   \tmp, =__virt_to_phys(omap_uart_phys)
+               ldrne   \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
+               ldreq   \tmp, =__virt_to_phys(omap_uart_virt)
+               ldrne   \tmp, =omap_uart_virt
                str     \rx, [\tmp, #0]
                b       9b
 99:

diff --git a/arch/arm/mach-omap2/include/mach/debug-macro.S b/arch/arm/mach-omap2/include/mach/debug-macro.S
index 35b2440..09331bb 100644 (file)
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap2/include/mach/debug-macro.S
@@ -36,7 +36,7 @@ omap_uart_lsr:        .word   0
                /* Use omap_uart_phys/virt if already configured */
 10:            mrc     p15, 0, \rx, c1, c0
                tst     \rx, #1                 @ MMU enabled?
-               ldreq   \rx, =omap_uart_phys    @ physical base address
+               ldreq   \rx, =__virt_to_phys(omap_uart_phys)    @ physical base address
                ldrne   \rx, =omap_uart_virt    @ virtual base address
                ldr     \rx, [\rx, #0]
                cmp     \rx, #0                 @ is port configured?
@@ -89,26 +89,36 @@ omap_uart_lsr:      .word   0
 44:            mov     \rx, #UART_OFFSET(OMAP4_UART4_BASE)
                b       98f
 95:            ldr     \rx, =ZOOM_UART_BASE
-               ldr     \tmp, =omap_uart_phys
+               mrc     p15, 0, \tmp, c1, c0
+               tst     \tmp, #1                @ MMU enabled?
+               ldreq   \tmp, =__virt_to_phys(omap_uart_phys)
+               ldrne   \tmp, =omap_uart_phys
                str     \rx, [\tmp, #0]
                ldr     \rx, =ZOOM_UART_VIRT
-               ldr     \tmp, =omap_uart_virt
+               ldreq   \tmp, =__virt_to_phys(omap_uart_virt)
+               ldrne   \tmp, =omap_uart_virt
                str     \rx, [\tmp, #0]
                mov     \rx, #(UART_LSR << ZOOM_PORT_SHIFT)
-               ldr     \tmp, =omap_uart_lsr
+               ldreq   \tmp, =__virt_to_phys(omap_uart_lsr)
+               ldrne   \tmp, =omap_uart_lsr
                str     \rx, [\tmp, #0]
                b       10b
 
                /* Store both phys and virt address for the uart */
 98:            add     \rx, \rx, #0x48000000   @ phys base
-               ldr     \tmp, =omap_uart_phys
+               mrc     p15, 0, \tmp, c1, c0
+               tst     \tmp, #1                @ MMU enabled?
+               ldreq   \tmp, =__virt_to_phys(omap_uart_phys)
+               ldrne   \tmp, =omap_uart_phys
                str     \rx, [\tmp, #0]
                sub     \rx, \rx, #0x48000000   @ phys base
                add     \rx, \rx, #0xfa000000   @ virt base
-               ldr     \tmp, =omap_uart_virt
+               ldreq   \tmp, =__virt_to_phys(omap_uart_virt)
+               ldrne   \tmp, =omap_uart_virt
                str     \rx, [\tmp, #0]
                mov     \rx, #(UART_LSR << OMAP_PORT_SHIFT)
-               ldr     \tmp, =omap_uart_lsr
+               ldreq   \tmp, =__virt_to_phys(omap_uart_lsr)
+               ldrne   \tmp, =omap_uart_lsr
                str     \rx, [\tmp, #0]
 
                b       10b
@@ -120,7 +130,10 @@ omap_uart_lsr:     .word   0
                .endm
 
                .macro  busyuart,rd,rx
-1001:          ldr     \rd, =omap_uart_lsr
+1001:          mrc     p15, 0, \rd, c1, c0
+               tst     \rd, #1         @ MMU enabled?
+               ldreq   \rd, =__virt_to_phys(omap_uart_lsr)
+               ldrne   \rd, =omap_uart_lsr
                ldr     \rd, [\rd, #0]
                ldrb    \rd, [\rx, \rd]
                and     \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)