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authorJason Wang <jason77.wang@gmail.com>2010-08-03 11:44:18 +0800
committerTony Lindgren <tony@atomide.com>2010-08-04 12:17:53 +0300
commit7e788b4289bb025a96e327c604cb2db92e17108f (patch)
tree6509b18c25f888a60e7222739e5ea5a0be96d639 /arch/arm/mach-omap2/include
parent331d919af416b9b92428947ef8c535a3e24c6b31 (diff)
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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>
Diffstat (limited to 'arch/arm/mach-omap2/include')
-rw-r--r--arch/arm/mach-omap2/include/mach/debug-macro.S29
1 files changed, 21 insertions, 8 deletions
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
--- 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)