1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This is a good place to put board specific reboot fixups. 4 * 5 * List of supported fixups: 6 * geode-gx1/cs5530a - Jaya Kumar <jayalk@intworks.biz> 7 * geode-gx/lx/cs5536 - Andres Salomon <dilinger@debian.org> 8 * 9 */ 10 11 #include <asm/delay.h> 12 #include <linux/pci.h> 13 #include <linux/interrupt.h> 14 #include <asm/reboot_fixups.h> 15 #include <asm/msr.h> 16 #include <linux/cs5535.h> 17 18 static void cs5530a_warm_reset(struct pci_dev *dev) 19 { 20 /* writing 1 to the reset control register, 0x44 causes the 21 cs5530a to perform a system warm reset */ 22 pci_write_config_byte(dev, 0x44, 0x1); 23 udelay(50); /* shouldn't get here but be safe and spin-a-while */ 24 return; 25 } 26 27 static void cs5536_warm_reset(struct pci_dev *dev) 28 { 29 /* writing 1 to the LSB of this MSR causes a hard reset */ 30 wrmsrl(MSR_DIVIL_SOFT_RESET, 1ULL); 31 udelay(50); /* shouldn't get here but be safe and spin a while */ 32 } 33 34 static void rdc321x_reset(struct pci_dev *dev) 35 { 36 unsigned i; 37 /* Voluntary reset the watchdog timer */ 38 outl(0x80003840, 0xCF8); 39 /* Generate a CPU reset on next tick */ 40 i = inl(0xCFC); 41 /* Use the minimum timer resolution */ 42 i |= 0x1600; 43 outl(i, 0xCFC); 44 outb(1, 0x92); 45 } 46 47 static void ce4100_reset(struct pci_dev *dev) 48 { 49 int i; 50 51 for (i = 0; i < 10; i++) { 52 outb(0x2, 0xcf9); 53 udelay(50); 54 } 55 } 56 57 struct device_fixup { 58 unsigned int vendor; 59 unsigned int device; 60 void (*reboot_fixup)(struct pci_dev *); 61 }; 62 63 /* 64 * PCI ids solely used for fixups_table go here 65 */ 66 #define PCI_DEVICE_ID_INTEL_CE4100 0x0708 67 68 static const struct device_fixup fixups_table[] = { 69 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, cs5530a_warm_reset }, 70 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA, cs5536_warm_reset }, 71 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE, cs5530a_warm_reset }, 72 { PCI_VENDOR_ID_RDC, PCI_DEVICE_ID_RDC_R6030, rdc321x_reset }, 73 { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100, ce4100_reset }, 74 }; 75 76 /* 77 * we see if any fixup is available for our current hardware. if there 78 * is a fixup, we call it and we expect to never return from it. if we 79 * do return, we keep looking and then eventually fall back to the 80 * standard mach_reboot on return. 81 */ 82 void mach_reboot_fixups(void) 83 { 84 const struct device_fixup *cur; 85 struct pci_dev *dev; 86 int i; 87 88 /* we can be called from sysrq-B code. In such a case it is 89 * prohibited to dig PCI */ 90 if (in_interrupt()) 91 return; 92 93 for (i=0; i < ARRAY_SIZE(fixups_table); i++) { 94 cur = &(fixups_table[i]); 95 dev = pci_get_device(cur->vendor, cur->device, NULL); 96 if (!dev) 97 continue; 98 99 cur->reboot_fixup(dev); 100 pci_dev_put(dev); 101 } 102 } 103 104