mirror of
https://github.com/torvalds/linux.git
synced 2024-12-14 07:02:23 +00:00
5cf4c80a14
Fixup davinci UART low-level debug code for new ARM generic p2v changes. Based on OMAP changes by Tony Lindgren Cc: Tony Lindgren <tony@atomide.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
92 lines
2.3 KiB
ArmAsm
92 lines
2.3 KiB
ArmAsm
/*
|
|
* Debugging macro for DaVinci
|
|
*
|
|
* Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
|
|
*
|
|
* 2007 (c) MontaVista Software, Inc. This file is licensed under
|
|
* the terms of the GNU General Public License version 2. This program
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
* or implied.
|
|
*/
|
|
|
|
/* Modifications
|
|
* Jan 2009 Chaithrika U S Added senduart, busyuart, waituart
|
|
* macros, based on debug-8250.S file
|
|
* but using 32-bit accesses required for
|
|
* some davinci devices.
|
|
*/
|
|
|
|
#include <linux/serial_reg.h>
|
|
|
|
#include <asm/memory.h>
|
|
|
|
#include <mach/serial.h>
|
|
|
|
#define UART_SHIFT 2
|
|
|
|
#define davinci_uart_v2p(x) ((x) - PAGE_OFFSET + PLAT_PHYS_OFFSET)
|
|
#define davinci_uart_p2v(x) ((x) - PLAT_PHYS_OFFSET + PAGE_OFFSET)
|
|
|
|
.pushsection .data
|
|
davinci_uart_phys: .word 0
|
|
davinci_uart_virt: .word 0
|
|
.popsection
|
|
|
|
.macro addruart, rp, rv
|
|
|
|
/* Use davinci_uart_phys/virt if already configured */
|
|
10: mrc p15, 0, \rp, c1, c0
|
|
tst \rp, #1 @ MMU enabled?
|
|
ldreq \rp, =davinci_uart_v2p(davinci_uart_phys)
|
|
ldrne \rp, =davinci_uart_phys
|
|
add \rv, \rp, #4 @ davinci_uart_virt
|
|
ldr \rp, [\rp, #0]
|
|
ldr \rv, [\rv, #0]
|
|
cmp \rp, #0 @ is port configured?
|
|
cmpne \rv, #0
|
|
bne 99f @ already configured
|
|
|
|
/* Check the debug UART address set in uncompress.h */
|
|
mrc p15, 0, \rp, c1, c0
|
|
tst \rp, #1 @ MMU enabled?
|
|
|
|
/* Copy uart phys address from decompressor uart info */
|
|
ldreq \rv, =davinci_uart_v2p(davinci_uart_phys)
|
|
ldrne \rv, =davinci_uart_phys
|
|
ldreq \rp, =DAVINCI_UART_INFO
|
|
ldrne \rp, =davinci_uart_p2v(DAVINCI_UART_INFO)
|
|
ldr \rp, [\rp, #0]
|
|
str \rp, [\rv]
|
|
|
|
/* Copy uart virt address from decompressor uart info */
|
|
ldreq \rv, =davinci_uart_v2p(davinci_uart_virt)
|
|
ldrne \rv, =davinci_uart_virt
|
|
ldreq \rp, =DAVINCI_UART_INFO
|
|
ldrne \rp, =davinci_uart_p2v(DAVINCI_UART_INFO)
|
|
ldr \rp, [\rp, #4]
|
|
str \rp, [\rv]
|
|
|
|
b 10b
|
|
99:
|
|
.endm
|
|
|
|
.macro senduart,rd,rx
|
|
str \rd, [\rx, #UART_TX << UART_SHIFT]
|
|
.endm
|
|
|
|
.macro busyuart,rd,rx
|
|
1002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT]
|
|
and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
|
|
teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
|
|
bne 1002b
|
|
.endm
|
|
|
|
.macro waituart,rd,rx
|
|
#ifdef FLOW_CONTROL
|
|
1001: ldr \rd, [\rx, #UART_MSR << UART_SHIFT]
|
|
tst \rd, #UART_MSR_CTS
|
|
beq 1001b
|
|
#endif
|
|
.endm
|
|
|