Commit df66834a authored by Finn Thain's avatar Finn Thain Committed by Geert Uytterhoeven
Browse files

m68k/mac: Fix unexpected interrupt with CONFIG_EARLY_PRINTK 



The present code does not wait for the SCC to finish resetting itself
before trying to initialise the device. The result is that the SCC
interrupt sources become enabled (if they weren't already). This leads to
an early boot crash (unexpected interrupt) given CONFIG_EARLY_PRINTK. Fix
this by adding a delay. A successful reset disables the interrupt sources.

Also, after the reset for channel A setup, the SCC then gets a second
reset for channel B setup which leaves channel A uninitialised again. Fix
this by performing the reset only once.

Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
parent e4aa937e

arch/m68k/kernel/head.S

+19 −10
Original line number Diff line number Diff line
@@ -2752,11 +2752,9 @@ func_return get_new_page 
#ifdef CONFIG_MAC



L(scc_initable_mac):

	.byte	9,12		/* Reset */

	.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	12,1,13,0	/* 38400 baud */
@@ -2899,6 +2897,7 @@ func_start serial_init,%d0/%d1/%a0/%a1 
	is_not_mac(L(serial_init_not_mac))



#ifdef SERIAL_DEBUG



/* You may define either or both of these. */

#define MAC_USE_SCC_A /* Modem port */

#define MAC_USE_SCC_B /* Printer port */
@@ -2908,9 +2907,21 @@ func_start serial_init,%d0/%d1/%a0/%a1 
#define mac_scc_cha_b_data_offset	0x4

#define mac_scc_cha_a_data_offset	0x6



#if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)

	movel	%pc@(L(mac_sccbase)),%a0

	/* Reset SCC device */

	moveb	#9,%a0@(mac_scc_cha_a_ctrl_offset)

	moveb	#0xc0,%a0@(mac_scc_cha_a_ctrl_offset)

	/* Wait for 5 PCLK cycles, which is about 68 CPU cycles */

	/* 5 / 3.6864 MHz = approx. 1.36 us = 68 / 50 MHz */

	movel	#35,%d0

5:

	subq	#1,%d0

	jne	5b

#endif



#ifdef MAC_USE_SCC_A

	/* Initialize channel A */

	movel	%pc@(L(mac_sccbase)),%a0

	lea	%pc@(L(scc_initable_mac)),%a1

5:	moveb	%a1@+,%d0

	jmi	6f
@@ -2922,9 +2933,6 @@ func_start serial_init,%d0/%d1/%a0/%a1 


#ifdef MAC_USE_SCC_B

	/* Initialize channel B */

#ifndef MAC_USE_SCC_A	/* Load mac_sccbase only if needed */

	movel	%pc@(L(mac_sccbase)),%a0

#endif	/* MAC_USE_SCC_A */

	lea	%pc@(L(scc_initable_mac)),%a1

7:	moveb	%a1@+,%d0

	jmi	8f
@@ -2933,6 +2941,7 @@ func_start serial_init,%d0/%d1/%a0/%a1 
	jra	7b

8:

#endif	/* MAC_USE_SCC_B */



#endif	/* SERIAL_DEBUG */



	jra	L(serial_init_done)
@@ -3006,17 +3015,17 @@ func_start serial_putc,%d0/%d1/%a0/%a1 


#ifdef SERIAL_DEBUG



#ifdef MAC_USE_SCC_A

#if defined(MAC_USE_SCC_A) || defined(MAC_USE_SCC_B)

	movel	%pc@(L(mac_sccbase)),%a1

#endif



#ifdef MAC_USE_SCC_A

3:	btst	#2,%a1@(mac_scc_cha_a_ctrl_offset)

	jeq	3b

	moveb	%d0,%a1@(mac_scc_cha_a_data_offset)

#endif	/* MAC_USE_SCC_A */



#ifdef MAC_USE_SCC_B

#ifndef MAC_USE_SCC_A	/* Load mac_sccbase only if needed */

	movel	%pc@(L(mac_sccbase)),%a1

#endif	/* MAC_USE_SCC_A */

4:	btst	#2,%a1@(mac_scc_cha_b_ctrl_offset)

	jeq	4b

	moveb	%d0,%a1@(mac_scc_cha_b_data_offset)

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