1 /* 2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/irq.h> 9 #include <asm/pci.h> 10 #include <asm/post.h> 11 #include <asm/processor.h> 12 #include <asm/arch/device.h> 13 #include <asm/arch/qemu.h> 14 #include <asm/fw_cfg.h> 15 16 static bool i440fx; 17 18 static void qemu_chipset_init(void) 19 { 20 u16 device, xbcs; 21 int pam, i; 22 23 /* 24 * i440FX and Q35 chipset have different PAM register offset, but with 25 * the same bitfield layout. Here we determine the offset based on its 26 * PCI device ID. 27 */ 28 device = x86_pci_read_config16(PCI_BDF(0, 0, 0), PCI_DEVICE_ID); 29 i440fx = (device == PCI_DEVICE_ID_INTEL_82441); 30 pam = i440fx ? I440FX_PAM : Q35_PAM; 31 32 /* 33 * Initialize Programmable Attribute Map (PAM) Registers 34 * 35 * Configure legacy segments C/D/E/F to system RAM 36 */ 37 for (i = 0; i < PAM_NUM; i++) 38 x86_pci_write_config8(PCI_BDF(0, 0, 0), pam + i, PAM_RW); 39 40 if (i440fx) { 41 /* 42 * Enable legacy IDE I/O ports decode 43 * 44 * Note: QEMU always decode legacy IDE I/O port on PIIX chipset. 45 * However Linux ata_piix driver does sanity check on these two 46 * registers to see whether legacy ports decode is turned on. 47 * This is to make Linux ata_piix driver happy. 48 */ 49 x86_pci_write_config16(PIIX_IDE, IDE0_TIM, IDE_DECODE_EN); 50 x86_pci_write_config16(PIIX_IDE, IDE1_TIM, IDE_DECODE_EN); 51 52 /* Enable I/O APIC */ 53 xbcs = x86_pci_read_config16(PIIX_ISA, XBCS); 54 xbcs |= APIC_EN; 55 x86_pci_write_config16(PIIX_ISA, XBCS, xbcs); 56 } else { 57 /* Configure PCIe ECAM base address */ 58 x86_pci_write_config32(PCI_BDF(0, 0, 0), PCIEX_BAR, 59 CONFIG_PCIE_ECAM_BASE | BAR_EN); 60 } 61 62 qemu_fwcfg_init(); 63 } 64 65 int arch_cpu_init(void) 66 { 67 int ret; 68 69 post_code(POST_CPU_INIT); 70 71 ret = x86_cpu_init_f(); 72 if (ret) 73 return ret; 74 75 return 0; 76 } 77 78 #ifndef CONFIG_EFI_STUB 79 int print_cpuinfo(void) 80 { 81 post_code(POST_CPU_INFO); 82 return default_print_cpuinfo(); 83 } 84 #endif 85 86 void reset_cpu(ulong addr) 87 { 88 /* cold reset */ 89 x86_full_reset(); 90 } 91 92 int arch_early_init_r(void) 93 { 94 qemu_chipset_init(); 95 96 return 0; 97 } 98 99 int arch_misc_init(void) 100 { 101 return pirq_init(); 102 } 103 104 #ifdef CONFIG_GENERATE_MP_TABLE 105 int mp_determine_pci_dstirq(int bus, int dev, int func, int pirq) 106 { 107 u8 irq; 108 109 if (i440fx) { 110 /* 111 * Not like most x86 platforms, the PIRQ[A-D] on PIIX3 are not 112 * connected to I/O APIC INTPIN#16-19. Instead they are routed 113 * to an irq number controled by the PIRQ routing register. 114 */ 115 irq = x86_pci_read_config8(PCI_BDF(bus, dev, func), 116 PCI_INTERRUPT_LINE); 117 } else { 118 /* 119 * ICH9's PIRQ[A-H] are not consecutive numbers from 0 to 7. 120 * PIRQ[A-D] still maps to [0-3] but PIRQ[E-H] maps to [8-11]. 121 */ 122 irq = pirq < 8 ? pirq + 16 : pirq + 12; 123 } 124 125 return irq; 126 } 127 #endif 128