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authorFinn Thain <fthain@telegraphics.com.au>2014-05-26 23:29:19 +1000
committerGeert Uytterhoeven <geert@linux-m68k.org>2014-05-28 10:11:53 +0200
commit83adc18110d632eebefb5c2a1dd27b58ae843d64 (patch)
tree4cfb54cc271d193b50135eb4d6c67cb8f0871898 /arch/m68k
parentc46f46d02c90959b82b99badfadc575081666aae (diff)
downloadlinux-83adc18110d632eebefb5c2a1dd27b58ae843d64.tar.gz
m68k/atari: fix SCC initialization for debug console
Fix SCC initialization for Atari as was previously fixed for Mac. It's probably not practical to share more code but some attempt is made to align the Mac and Atari variants. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k')
-rw-r--r--arch/m68k/kernel/head.S31
1 files changed, 21 insertions, 10 deletions
diff --git a/arch/m68k/kernel/head.S b/arch/m68k/kernel/head.S
index b671f07aeb8..15c8f55e483 100644
--- a/arch/m68k/kernel/head.S
+++ b/arch/m68k/kernel/head.S
@@ -2722,6 +2722,7 @@ func_return get_new_page
#define MAC_USE_SCC_B /* Printer port */
#if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)
+/* Initialisation table for SCC with 3.6864 MHz PCLK */
L(scc_initable_mac):
.byte 4,0x44 /* x16, 1 stopbit, no parity */
.byte 3,0xc0 /* receiver: 8 bpc */
@@ -2744,14 +2745,12 @@ L(scc_initable_mac):
#define USE_MFP
#if defined(USE_SCC_A) || defined(USE_SCC_B)
-#define USE_SCC
-/* Initialisation table for SCC */
-L(scc_initable):
- .byte 9,12 /* Reset */
+/* Initialisation table for SCC with 7.9872 MHz PCLK */
+/* PCLK == 8.0539 gives baud == 9680.1 */
+L(scc_initable_atari):
.byte 4,0x44 /* x16, 1 stopbit, no parity */
.byte 3,0xc0 /* receiver: 8 bpc */
.byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */
- .byte 9,0 /* no interrupts */
.byte 10,0 /* NRZ */
.byte 11,0x50 /* use baud rate generator */
.byte 12,24,13,0 /* 9600 baud */
@@ -2800,7 +2799,7 @@ LMFP_UDR = 0xfffa2f
*/
/*
- * Initialize serial port hardware for 9600/8/1
+ * Initialize serial port hardware
*/
func_start serial_init,%d0/%d1/%a0/%a1
/*
@@ -2810,7 +2809,7 @@ func_start serial_init,%d0/%d1/%a0/%a1
* d0 = boot info offset
* CONFIG_ATARI
* a0 = address of SCC
- * a1 = Liobase address/address of scc_initable
+ * a1 = Liobase address/address of scc_initable_atari
* d0 = init data for serial port
* CONFIG_MAC
* a0 = address of SCC
@@ -2846,9 +2845,21 @@ func_start serial_init,%d0/%d1/%a0/%a1
moveb %a1@(LPSG_READ),%d0
bset #5,%d0
moveb %d0,%a1@(LPSG_WRITE)
-#elif defined(USE_SCC)
+#elif defined(USE_SCC_A) || defined(USE_SCC_B)
lea %a1@(LSCC_CTRL),%a0
- lea %pc@(L(scc_initable)),%a1
+ /* Reset SCC register pointer */
+ moveb %a0@,%d0
+ /* Reset SCC device: write register pointer then register value */
+ moveb #9,%a0@
+ moveb #0xc0,%a0@
+ /* Wait for 5 PCLK cycles, which is about 63 CPU cycles */
+ /* 5 / 7.9872 MHz = approx. 0.63 us = 63 / 100 MHz */
+ movel #32,%d0
+2:
+ subq #1,%d0
+ jne 2b
+ /* Initialize channel */
+ lea %pc@(L(scc_initable_atari)),%a1
2: moveb %a1@+,%d0
jmi 3f
moveb %d0,%a0@
@@ -3017,7 +3028,7 @@ func_start serial_putc,%d0/%d1/%a0/%a1
nop
bset #5,%d0
moveb %d0,%a1@(LPSG_WRITE)
-#elif defined(USE_SCC)
+#elif defined(USE_SCC_A) || defined(USE_SCC_B)
3: btst #2,%a1@(LSCC_CTRL)
jeq 3b
moveb %d0,%a1@(LSCC_DATA)