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ARM: uniphier: fix glitch signal problem for low-level debug

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Currently, IECTRL is enabled after pin-mux settings for the low-level
debugging for PH1-LD4 and PH1-sLD8.  While IECTRL is disabled, input
signals are pulled-down, i.e. glitch signal (Low to High transition)
problem occurs if pin-mux is set up first.  As a result, one invalid
character is input to the UART block and the auto-boot counting is
terminated immediately.

The correct initialization procedure is:
 [1] Enable IECTRL (if IECTRL exists for the pins)
 [2] Set up pin-muxing
 [3] Deassert the reset of the hardware block

Currently, the low-level debugging is working for PH1-sLD3 and
PH1-Pro4, but just in case, follow the sequence for all the SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2015-09-22 00:27:36 +09:00
parent 257b11f32d
commit fcbcd59730
4 changed files with 22 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm/mach-uniphier/ph1-ld4/lowlevel_debug.S
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@ -14,16 +14,16 @@
#include <mach/debug-uart.S>
ENTRY(setup_lowlevel_debug)
init_debug_uart r0, r1, r2
/* UART Port 0 */
sg_set_pinsel 85, 1, 8, 4, r0, r1
sg_set_pinsel 88, 1, 8, 4, r0, r1
ldr r0, =SG_IECTRL
ldr r1, [r0]
orr r1, r1, #1
str r1, [r0]
/* UART Port 0 */
sg_set_pinsel 85, 1, 8, 4, r0, r1
sg_set_pinsel 88, 1, 8, 4, r0, r1
init_debug_uart r0, r1, r2
mov pc, lr
ENDPROC(setup_lowlevel_debug)

14
arch/arm/mach-uniphier/ph1-pro4/lowlevel_debug.S
View File

@ -15,13 +15,6 @@
#include <mach/debug-uart.S>
ENTRY(setup_lowlevel_debug)
ldr r0, =SC_CLKCTRL
ldr r1, [r0]
orr r1, r1, #SC_CLKCTRL_CEN_PERI
str r1, [r0]
init_debug_uart r0, r1, r2
/* UART Port 0 */
sg_set_pinsel 127, 0, 4, 8, r0, r1
sg_set_pinsel 128, 0, 4, 8, r0, r1
@ -30,5 +23,12 @@ ENTRY(setup_lowlevel_debug)
mov r1, #1
str r1, [r0]
ldr r0, =SC_CLKCTRL
ldr r1, [r0]
orr r1, r1, #SC_CLKCTRL_CEN_PERI
str r1, [r0]
init_debug_uart r0, r1, r2
mov pc, lr
ENDPROC(setup_lowlevel_debug)

6
arch/arm/mach-uniphier/ph1-sld3/lowlevel_debug.S
View File

@ -15,6 +15,9 @@
#include <mach/debug-uart.S>
ENTRY(setup_lowlevel_debug)
sg_set_pinsel 63, 0, 4, 4, r0, r1
sg_set_pinsel 64, 1, 4, 4, r0, r1
ldr r0, =BCSCR5
ldr r1, =0x24440000
str r1, [r0]
@ -26,8 +29,5 @@ ENTRY(setup_lowlevel_debug)
init_debug_uart r0, r1, r2
sg_set_pinsel 63, 0, 4, 4, r0, r1
sg_set_pinsel 64, 1, 4, 4, r0, r1
mov pc, lr
ENDPROC(setup_lowlevel_debug)

12
arch/arm/mach-uniphier/ph1-sld8/lowlevel_debug.S
View File

@ -14,16 +14,16 @@
#include <mach/debug-uart.S>
ENTRY(setup_lowlevel_debug)
init_debug_uart r0, r1, r2
/* UART Port 0 */
sg_set_pinsel 70, 3, 8, 4, r0, r1
sg_set_pinsel 71, 3, 8, 4, r0, r1
ldr r0, =SG_IECTRL
ldr r1, [r0]
orr r1, r1, #1
str r1, [r0]
/* UART Port 0 */
sg_set_pinsel 70, 3, 8, 4, r0, r1
sg_set_pinsel 71, 3, 8, 4, r0, r1
init_debug_uart r0, r1, r2
mov pc, lr
ENDPROC(setup_lowlevel_debug)