// 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 */
        wrmsrq(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);
        }
}