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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018
* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <log.h>
#include <sysreset.h>
#include <wait_bit.h>
#include <linux/delay.h>
#include <asm/global_data.h>
#include "sysreset_mpc83xx.h"
/* Magic 4-byte word to enable reset ('RSTE' in ASCII) */
static const u32 RPR_MAGIC = 0x52535445;
/* Wait at most 2000ms for reset control enable bit */
static const uint RESET_WAIT_TIMEOUT = 2000;
/**
* __do_reset() - Execute the system reset
*
* Return: The functions resets the system, and never returns.
*/
static int __do_reset(void)
{
ulong msr;
int res;
immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
puts("Resetting the board.\n");
/* Interrupts and MMU off */
msr = mfmsr();
msr &= ~(MSR_EE | MSR_IR | MSR_DR);
mtmsr(msr);
/* Enable Reset Control Reg */
out_be32(&immap->reset.rpr, RPR_MAGIC);
sync();
isync();
/* Confirm Reset Control Reg is enabled */
res = wait_for_bit_be32(&immap->reset.rcer, RCER_CRE, true,
RESET_WAIT_TIMEOUT, false);
if (res) {
debug("%s: Timed out waiting for reset control to be set\n",
__func__);
return res;
}
udelay(200);
/* Perform reset, only one bit */
out_be32(&immap->reset.rcr, RCR_SWHR);
/* Never executes */
return 0;
}
static int mpc83xx_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
switch (type) {
case SYSRESET_WARM:
case SYSRESET_COLD:
return __do_reset();
default:
return -EPROTONOSUPPORT;
}
return -EINPROGRESS;
}
/**
* print_83xx_arb_event() - Print arbiter events to buffer
* @force: Print arbiter events, even if none are indicated by the system
* @buf: The buffer to receive the printed arbiter event information
* @size: The size of the buffer to receive the printed arbiter event
* information in bytes
*
* Return: Number of bytes printed to buffer, -ve on error
*/
static int print_83xx_arb_event(bool force, char *buf, int size)
{
int etype = (gd->arch.arbiter_event_attributes & AEATR_EVENT)
>> AEATR_EVENT_SHIFT;
int mstr_id = (gd->arch.arbiter_event_attributes & AEATR_MSTR_ID)
>> AEATR_MSTR_ID_SHIFT;
int tbst = (gd->arch.arbiter_event_attributes & AEATR_TBST)
>> AEATR_TBST_SHIFT;
int tsize = (gd->arch.arbiter_event_attributes & AEATR_TSIZE)
>> AEATR_TSIZE_SHIFT;
int ttype = (gd->arch.arbiter_event_attributes & AEATR_TTYPE)
>> AEATR_TTYPE_SHIFT;
int tsize_val = (tbst << 3) | tsize;
int tsize_bytes = tbst ? (tsize ? tsize : 8) : 16 + 8 * tsize;
int res = 0;
/*
* If we don't force output, and there is no event (event address ==
* 0), then don't print anything
*/
if (!force && !gd->arch.arbiter_event_address)
return 0;
if (IS_ENABLED(CONFIG_DISPLAY_AER_FULL)) {
res = snprintf(buf, size,
"Arbiter Event Status:\n"
" %s: 0x%08lX\n"
" %s: 0x%1x = %s\n"
" %s: 0x%02x = %s\n"
" %s: 0x%1x = %d bytes\n"
" %s: 0x%02x = %s\n",
"Event Address", gd->arch.arbiter_event_address,
"Event Type", etype, event[etype],
"Master ID", mstr_id, master[mstr_id],
"Transfer Size", tsize_val, tsize_bytes,
"Transfer Type", ttype, transfer[ttype]);
} else if (IS_ENABLED(CONFIG_DISPLAY_AER_BRIEF)) {
res = snprintf(buf, size,
"Arbiter Event Status: AEATR=0x%08lX, AEADR=0x%08lX\n",
gd->arch.arbiter_event_attributes,
gd->arch.arbiter_event_address);
}
return res;
}
static int mpc83xx_sysreset_get_status(struct udevice *dev, char *buf, int size)
{
/* Ad-hoc data structure to map RSR bit values to their descriptions */
static const struct {
/* Bit mask for the bit in question */
ulong mask;
/* Description of the bitmask in question */
char *desc;
} bits[] = {
{
RSR_SWSR, "Software Soft"}, {
RSR_SWHR, "Software Hard"}, {
RSR_JSRS, "JTAG Soft"}, {
RSR_CSHR, "Check Stop"}, {
RSR_SWRS, "Software Watchdog"}, {
RSR_BMRS, "Bus Monitor"}, {
RSR_SRS, "External/Internal Soft"}, {
RSR_HRS, "External/Internal Hard"}
};
int res;
ulong rsr = gd->arch.reset_status;
int i;
char *sep;
res = snprintf(buf, size, "Reset Status:");
if (res < 0) {
debug("%s: Could not write reset status message (err = %d)\n",
dev->name, res);
return -EIO;
}
buf += res;
size -= res;
sep = " ";
for (i = 0; i < ARRAY_SIZE(bits); i++)
/* Print description of set bits */
if (rsr & bits[i].mask) {
res = snprintf(buf, size, "%s%s%s", sep, bits[i].desc,
(i == ARRAY_SIZE(bits) - 1) ? "\n" : "");
if (res < 0) {
debug("%s: Could not write reset status message (err = %d)\n",
dev->name, res);
return -EIO;
}
buf += res;
size -= res;
sep = ", ";
}
/*
* TODO(mario.six@gdsys.cc): Move this into a dedicated
* arbiter driver
*/
if (IS_ENABLED(CONFIG_DISPLAY_AER_FULL) ||
IS_ENABLED(CONFIG_DISPLAY_AER_BRIEF)) {
/*
* If there was a bus monitor reset event, we force the arbiter
* event to be printed
*/
res = print_83xx_arb_event(rsr & RSR_BMRS, buf, size);
if (res < 0) {
debug("%s: Could not write arbiter event message (err = %d)\n",
dev->name, res);
return -EIO;
}
buf += res;
size -= res;
}
snprintf(buf, size, "\n");
return 0;
}
static struct sysreset_ops mpc83xx_sysreset = {
.request = mpc83xx_sysreset_request,
.get_status = mpc83xx_sysreset_get_status,
};
U_BOOT_DRIVER(sysreset_mpc83xx) = {
.name = "mpc83xx_sysreset",
.id = UCLASS_SYSRESET,
.ops = &mpc83xx_sysreset,
};
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