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Commit f9994894 authored by Kars de Jong's avatar Kars de Jong Committed by Geert Uytterhoeven
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m68k/mvme16x: Add support for EARLY_PRINTK 



Added support for EARLY_PRINTK when running on an MVME16x board.

Signed-off-by: default avatarKars de Jong <jongk@linux-m68k.org>
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
parent f8bd9de9

arch/m68k/Kconfig.debug

+11 −0
Original line number Diff line number Diff line
@@ -2,6 +2,17 @@ menu "Kernel hacking" 


source "lib/Kconfig.debug"



config EARLY_PRINTK

	bool "Early printk" if EMBEDDED

	depends on MVME16x

	default y

	help

          Write kernel log output directly to a serial port.



          This is useful for kernel debugging when your machine crashes very

          early before the console code is initialized.

          You should normally say N here, unless you want to debug such a crash.



if !MMU



config FULLDEBUG

arch/m68k/mvme16x/config.c

+160 −0
Original line number Diff line number Diff line
@@ -124,6 +124,163 @@ static void __init mvme16x_init_IRQ (void) 
#define PccSCCMICR	0x1d

#define PccSCCTICR	0x1e

#define PccSCCRICR	0x1f

#define PccTPIACKR	0x25



#ifdef CONFIG_EARLY_PRINTK



/**** cd2401 registers ****/

#define CD2401_ADDR	(0xfff45000)



#define CyGFRCR         (0x81)

#define CyCCR		(0x13)

#define      CyCLR_CHAN		(0x40)

#define      CyINIT_CHAN	(0x20)

#define      CyCHIP_RESET	(0x10)

#define      CyENB_XMTR		(0x08)

#define      CyDIS_XMTR		(0x04)

#define      CyENB_RCVR		(0x02)

#define      CyDIS_RCVR		(0x01)

#define CyCAR		(0xee)

#define CyIER		(0x11)

#define      CyMdmCh		(0x80)

#define      CyRxExc		(0x20)

#define      CyRxData		(0x08)

#define      CyTxMpty		(0x02)

#define      CyTxRdy		(0x01)

#define CyLICR		(0x26)

#define CyRISR		(0x89)

#define      CyTIMEOUT		(0x80)

#define      CySPECHAR		(0x70)

#define      CyOVERRUN		(0x08)

#define      CyPARITY		(0x04)

#define      CyFRAME		(0x02)

#define      CyBREAK		(0x01)

#define CyREOIR		(0x84)

#define CyTEOIR		(0x85)

#define CyMEOIR		(0x86)

#define      CyNOTRANS		(0x08)

#define CyRFOC		(0x30)

#define CyRDR		(0xf8)

#define CyTDR		(0xf8)

#define CyMISR		(0x8b)

#define CyRISR		(0x89)

#define CyTISR		(0x8a)

#define CyMSVR1		(0xde)

#define CyMSVR2		(0xdf)

#define      CyDSR		(0x80)

#define      CyDCD		(0x40)

#define      CyCTS		(0x20)

#define      CyDTR		(0x02)

#define      CyRTS		(0x01)

#define CyRTPRL		(0x25)

#define CyRTPRH		(0x24)

#define CyCOR1		(0x10)

#define      CyPARITY_NONE	(0x00)

#define      CyPARITY_E		(0x40)

#define      CyPARITY_O		(0xC0)

#define      Cy_5_BITS		(0x04)

#define      Cy_6_BITS		(0x05)

#define      Cy_7_BITS		(0x06)

#define      Cy_8_BITS		(0x07)

#define CyCOR2		(0x17)

#define      CyETC		(0x20)

#define      CyCtsAE		(0x02)

#define CyCOR3		(0x16)

#define      Cy_1_STOP		(0x02)

#define      Cy_2_STOP		(0x04)

#define CyCOR4		(0x15)

#define      CyREC_FIFO		(0x0F)  /* Receive FIFO threshold */

#define CyCOR5		(0x14)

#define CyCOR6		(0x18)

#define CyCOR7		(0x07)

#define CyRBPR		(0xcb)

#define CyRCOR		(0xc8)

#define CyTBPR		(0xc3)

#define CyTCOR		(0xc0)

#define CySCHR1		(0x1f)

#define CySCHR2 	(0x1e)

#define CyTPR		(0xda)

#define CyPILR1		(0xe3)

#define CyPILR2		(0xe0)

#define CyPILR3		(0xe1)

#define CyCMR		(0x1b)

#define      CyASYNC		(0x02)

#define CyLICR          (0x26)

#define CyLIVR          (0x09)

#define CySCRL		(0x23)

#define CySCRH		(0x22)

#define CyTFTC		(0x80)



static void cons_write(struct console *co, const char *str, unsigned count)

{

	volatile unsigned char *base_addr = (u_char *)CD2401_ADDR;

	volatile u_char sink;

	u_char ier;

	int port;

	u_char do_lf = 0;

	int i = 0;



	/* Ensure transmitter is enabled! */



	port = 0;

	base_addr[CyCAR] = (u_char)port;

	while (base_addr[CyCCR])

		;

	base_addr[CyCCR] = CyENB_XMTR;



	ier = base_addr[CyIER];

	base_addr[CyIER] = CyTxMpty;



	while (1) {

		if (pcc2chip[PccSCCTICR] & 0x20)

		{

			/* We have a Tx int. Acknowledge it */

			sink = pcc2chip[PccTPIACKR];

			if ((base_addr[CyLICR] >> 2) == port) {

				if (i == count) {

					/* Last char of string is now output */

					base_addr[CyTEOIR] = CyNOTRANS;

					break;

				}

				if (do_lf) {

					base_addr[CyTDR] = '\n';

					str++;

					i++;

					do_lf = 0;

				}

				else if (*str == '\n') {

					base_addr[CyTDR] = '\r';

					do_lf = 1;

				}

				else {

					base_addr[CyTDR] = *str++;

					i++;

				}

				base_addr[CyTEOIR] = 0;

			}

			else

				base_addr[CyTEOIR] = CyNOTRANS;

		}

	}



	base_addr[CyIER] = ier;

}



static struct console cons_info =

{

	.name	= "sercon",

	.write	= cons_write,

	.flags	= CON_PRINTBUFFER | CON_BOOT,

	.index	= -1,

};



static void __init mvme16x_early_console(void)

{

	register_console(&cons_info);



	printk(KERN_INFO "MVME16x: early console registered\n");

}

#endif



void __init config_mvme16x(void)

{
@@ -183,6 +340,9 @@ void __init config_mvme16x(void) 
	pcc2chip[PccSCCMICR] = 0x10;

	pcc2chip[PccSCCTICR] = 0x10;

	pcc2chip[PccSCCRICR] = 0x10;

#ifdef CONFIG_EARLY_PRINTK

	mvme16x_early_console();

#endif

    }

}