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

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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>
This commit is contained in:
Nicolas Pitre 2011-08-31 13:57:37 -04:00 committed by Nicolas Pitre
parent 639da5ee37
commit dd185456ef
4 changed files with 17 additions and 14 deletions
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8
arch/arm/mach-omap1/include/mach/debug-macro.S
View File

@ -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?

9
arch/arm/mach-omap2/include/mach/debug-macro.S
View File

@ -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?

6
arch/arm/plat-omap/include/plat/serial.h
View File

@ -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

8
arch/arm/plat-omap/include/plat/uncompress.h
View File

@ -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)