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// SPDX-License-Identifier: GPL-2.0
/*
* This is a good place to put board specific reboot fixups.
*
* List of supported fixups:
* geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz>
* geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org>
*
*/
#include <asm/delay.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <asm/reboot_fixups.h>
#include <asm/msr.h>
#include <linux/cs5535.h>
static void cs5530a_warm_reset(struct pci_dev *dev)
{
/* writing 1 to the reset control register, 0x44 causes the
cs5530a to perform a system warm reset */
pci_write_config_byte(dev, 0x44, 0x1);
udelay(50); /* shouldn't get here but be safe and spin-a-while */
return;
}
static void cs5536_warm_reset(struct pci_dev *dev)
{
/* writing 1 to the LSB of this MSR causes a hard reset */
wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL);
udelay(50); /* shouldn't get here but be safe and spin a while */
}
static void rdc321x_reset(struct pci_dev *dev)
{
unsigned i;
/* Voluntary reset the watchdog timer */
outl(0x80003840, 0xCF8);
/* Generate a CPU reset on next tick */
i = inl(0xCFC);
/* Use the minimum timer resolution */
i |= 0x1600;
outl(i, 0xCFC);
outb(1, 0x92);
}
static void ce4100_reset(struct pci_dev *dev)
{
int i;
for (i = 0; i < 10; i++) {
outb(0x2, 0xcf9);
udelay(50);
}
}
struct device_fixup {
unsigned int vendor;
unsigned int device;
void (*reboot_fixup)(struct pci_dev *);
};
/*
* PCI ids solely used for fixups_table go here
*/
#define PCI_DEVICE_ID_INTEL_CE4100 0x0708
static const struct device_fixup fixups_table[] = {
{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset },
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset },
{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset },
{ PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset },
{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100, ce4100_reset },
};
/*
* we see if any fixup is available for our current hardware. if there
* is a fixup, we call it and we expect to never return from it. if we
* do return, we keep looking and then eventually fall back to the
* standard mach_reboot on return.
*/
void mach_reboot_fixups(void)
{
const struct device_fixup *cur;
struct pci_dev *dev;
int i;
/* we can be called from sysrq-B code. In such a case it is
* prohibited to dig PCI */
if (in_interrupt())
return;
for (i=0; i < ARRAY_SIZE(fixups_table); i++) {
cur = &(fixups_table[i]);
dev = pci_get_device(cur->vendor, cur->device, NULL);
if (!dev)
continue;
cur->reboot_fixup(dev);
pci_dev_put(dev);
}
}
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