diff options
Diffstat (limited to 'arch/x86/kernel/reboot_fixups_32.c')
| -rw-r--r-- | arch/x86/kernel/reboot_fixups_32.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/x86/kernel/reboot_fixups_32.c b/arch/x86/kernel/reboot_fixups_32.c new file mode 100644 index 000000000..b7c0f142d --- /dev/null +++ b/arch/x86/kernel/reboot_fixups_32.c @@ -0,0 +1,103 @@ +// 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); + } +} + |