ARM: plat-omap: make OMAP_UART_INFO into a relative offset

This is the first step to remove PLAT_PHYS_OFFSET usage from the debug
UART code.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>

4 files changed, 17 insertions, 14 deletions

diff --git a/arch/arm/mach-omap1/include/mach/debug-macro.S b/arch/arm/mach-omap1/include/mach/debug-macro.S
index f944ae8abc9..6a171181986 100644
--- a/arch/arm/mach-omap1/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap1/include/mach/debug-macro.S
@@ -46,11 +46,9 @@ omap_uart_virt:	.word	0x0
                 bne     99f                     @ already configured
 
                 /* Check the debug UART configuration set in uncompress.h */
-                mrc     p15, 0, \rp, c1, c0
-                tst     \rp, #1                 @ MMU enabled?
-                ldreq   \rp, =OMAP_UART_INFO    @ MMU not enabled
-                ldrne   \rp, =omap_uart_p2v(OMAP_UART_INFO)     @ MMU enabled
-                ldr     \rp, [\rp, #0]
+                and     \rp, pc, #0xff000000
+                ldr     \rv, =OMAP_UART_INFO_OFS
+                ldr     \rp, [\rp, \rv]
 
                 /* Select the UART to use based on the UART1 scratchpad value */
 10:             cmp     \rp, #0                 @ no port configured?
diff --git a/arch/arm/mach-omap2/include/mach/debug-macro.S b/arch/arm/mach-omap2/include/mach/debug-macro.S
index fbd23ec81a2..745e2ff3e90 100644
--- a/arch/arm/mach-omap2/include/mach/debug-macro.S
+++ b/arch/arm/mach-omap2/include/mach/debug-macro.S
@@ -49,11 +49,10 @@ omap_uart_lsr:	.word	0
                 bne     99f                     @ already configured
 
                 /* Check the debug UART configuration set in uncompress.h */
-                mrc     p15, 0, \rp, c1, c0
-                tst     \rp, #1                 @ MMU enabled?
-                ldreq   \rp, =OMAP_UART_INFO    @ MMU not enabled
-                ldrne   \rp, =omap_uart_p2v(OMAP_UART_INFO)     @ MMU enabled
-                ldr     \rp, [\rp, #0]
+                mov     \rp, pc
+                ldr     \rv, =OMAP_UART_INFO_OFS
+                and     \rp, \rp, #0xff000000
+                ldr     \rp, [\rp, \rv]
 
                 /* Select the UART to use based on the UART1 scratchpad value */
                 cmp     \rp, #0                 @ no port configured?
diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h
index de3b10c1812..1ab9fd6abe6 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/arch/arm/plat-omap/include/plat/serial.h
@@ -16,8 +16,8 @@
 #include <linux/init.h>
 
 /*
- * Memory entry used for the DEBUG_LL UART configuration. See also
- * uncompress.h and debug-macro.S.
+ * Memory entry used for the DEBUG_LL UART configuration, relative to
+ * start of RAM. See also uncompress.h and debug-macro.S.
  *
  * Note that using a memory location for storing the UART configuration
  * has at least two limitations:
@@ -27,7 +27,7 @@
  * 2. We assume printascii is called at least once before paging_init,
  *    and addruart has a chance to read OMAP_UART_INFO
  */
-#define OMAP_UART_INFO          (PLAT_PHYS_OFFSET + 0x3ffc)
+#define OMAP_UART_INFO_OFS      0x3ffc
 
 /* OMAP1 serial ports */
 #define OMAP1_UART1_BASE        0xfffb0000
diff --git a/arch/arm/plat-omap/include/plat/uncompress.h b/arch/arm/plat-omap/include/plat/uncompress.h
index a067484cc4a..2f472e989ec 100644
--- a/arch/arm/plat-omap/include/plat/uncompress.h
+++ b/arch/arm/plat-omap/include/plat/uncompress.h
@@ -36,7 +36,13 @@ int uart_shift;
  */
 static void set_omap_uart_info(unsigned char port)
 {
-        *(volatile u32 *)OMAP_UART_INFO = port;
+        /*
+         * Get address of some.bss variable and round it down
+         * a la CONFIG_AUTO_ZRELADDR.
+         */
+        u32 ram_start = (u32)&uart_shift & 0xf8000000;
+        u32 *uart_info = (u32 *)(ram_start + OMAP_UART_INFO_OFS);
+        *uart_info = port;
 }
 
 static void putc(int c)