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m68k: mac: Refactor iop_preinit() and iop_init() 

The idea behind iop_preinit() was to put the SCC IOP into bypass mode.
However, that remains unimplemented and implementing it would be
difficult. Let the comments and code reflect this. Even if iop_preinit()
worked as described in the comments, it gets called immediately before
iop_init() so it might as well part of iop_init().

Cc: Joshua Thompson <funaho@jurai.org>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Link: https://lore.kernel.org/r/0a7b09f5e5f48e270b82041c19e8f20f54c69216.1605847196.git.fthain@telegraphics.com.au
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2020-11-20 15:39:56 +11:00 committed by Geert Uytterhoeven
parent 8ae0b65ac7
commit 266994e3ac
2 changed files with 18 additions and 44 deletions
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8
arch/m68k/mac/config.c
View File

@ -55,7 +55,6 @@ struct mac_booter_data mac_bi_data;
static unsigned long mac_orig_videoaddr;
extern int mac_hwclk(int, struct rtc_time *);
extern void iop_preinit(void);
extern void iop_init(void);
extern void via_init(void);
extern void via_init_clock(irq_handler_t func);
@ -834,13 +833,6 @@ static void __init mac_identify(void)
break;
}
/*
* We need to pre-init the IOPs, if any. Otherwise
* the serial console won't work if the user had
* the serial ports set to "Faster" mode in MacOS.
*/
iop_preinit();
pr_info("Detected Macintosh model: %d\n", model);
/*

54
arch/m68k/mac/iop.c
View File

@ -47,6 +47,10 @@
*
* TODO:
*
* o The SCC IOP has to be placed in bypass mode before the serial console
* gets initialized. iop_init() would be one place to do that. Or the
* bootloader could do that. For now, the Serial Switch control panel
* is needed for that -- contrary to the changelog above.
* o Something should be periodically checking iop_alive() to make sure the
* IOP hasn't died.
* o Some of the IOP manager routines need better error checking and
@ -224,40 +228,6 @@ static struct iop_msg *iop_get_unused_msg(void)
return NULL;
}
/*
* This is called by the startup code before anything else. Its purpose
* is to find and initialize the IOPs early in the boot sequence, so that
* the serial IOP can be placed into bypass mode _before_ we try to
* initialize the serial console.
*/
void __init iop_preinit(void)
{
if (macintosh_config->scc_type == MAC_SCC_IOP) {
if (macintosh_config->ident == MAC_MODEL_IIFX) {
iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_IIFX;
} else {
iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA;
}
iop_scc_present = 1;
} else {
iop_base[IOP_NUM_SCC] = NULL;
iop_scc_present = 0;
}
if (macintosh_config->adb_type == MAC_ADB_IOP) {
if (macintosh_config->ident == MAC_MODEL_IIFX) {
iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_IIFX;
} else {
iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA;
}
iop_stop(iop_base[IOP_NUM_ISM]);
iop_ism_present = 1;
} else {
iop_base[IOP_NUM_ISM] = NULL;
iop_ism_present = 0;
}
}
/*
* Initialize the IOPs, if present.
*/
@ -266,11 +236,23 @@ void __init iop_init(void)
{
int i;
if (iop_scc_present) {
if (macintosh_config->scc_type == MAC_SCC_IOP) {
if (macintosh_config->ident == MAC_MODEL_IIFX)
iop_base[IOP_NUM_SCC] = (struct mac_iop *)SCC_IOP_BASE_IIFX;
else
iop_base[IOP_NUM_SCC] = (struct mac_iop *)SCC_IOP_BASE_QUADRA;
iop_scc_present = 1;
pr_debug("SCC IOP detected at %p\n", iop_base[IOP_NUM_SCC]);
}
if (iop_ism_present) {
if (macintosh_config->adb_type == MAC_ADB_IOP) {
if (macintosh_config->ident == MAC_MODEL_IIFX)
iop_base[IOP_NUM_ISM] = (struct mac_iop *)ISM_IOP_BASE_IIFX;
else
iop_base[IOP_NUM_ISM] = (struct mac_iop *)ISM_IOP_BASE_QUADRA;
iop_ism_present = 1;
pr_debug("ISM IOP detected at %p\n", iop_base[IOP_NUM_ISM]);
iop_stop(iop_base[IOP_NUM_ISM]);
iop_start(iop_base[IOP_NUM_ISM]);
iop_alive(iop_base[IOP_NUM_ISM]); /* clears the alive flag */
}