1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2001 Dave Engebretsen, IBM Corporation 4 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM 5 * 6 * pSeries specific routines for PCI. 7 */ 8 9 #include <linux/init.h> 10 #include <linux/ioport.h> 11 #include <linux/kernel.h> 12 #include <linux/pci.h> 13 #include <linux/string.h> 14 15 #include <asm/eeh.h> 16 #include <asm/pci-bridge.h> 17 #include <asm/ppc-pci.h> 18 #include <asm/pci.h> 19 #include "pseries.h" 20 21 #ifdef CONFIG_PCI_IOV 22 #define MAX_VFS_FOR_MAP_PE 256 23 struct pe_map_bar_entry { 24 __be64 bar; /* Input: Virtual Function BAR */ 25 __be16 rid; /* Input: Virtual Function Router ID */ 26 __be16 pe_num; /* Output: Virtual Function PE Number */ 27 __be32 reserved; /* Reserved Space */ 28 }; 29 30 static int pseries_send_map_pe(struct pci_dev *pdev, u16 num_vfs, 31 struct pe_map_bar_entry *vf_pe_array) 32 { 33 struct pci_dn *pdn; 34 int rc; 35 unsigned long buid, addr; 36 int ibm_map_pes = rtas_function_token(RTAS_FN_IBM_OPEN_SRIOV_MAP_PE_NUMBER); 37 38 if (ibm_map_pes == RTAS_UNKNOWN_SERVICE) 39 return -EINVAL; 40 41 pdn = pci_get_pdn(pdev); 42 addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); 43 buid = pdn->phb->buid; 44 spin_lock(&rtas_data_buf_lock); 45 memcpy(rtas_data_buf, vf_pe_array, 46 RTAS_DATA_BUF_SIZE); 47 rc = rtas_call(ibm_map_pes, 5, 1, NULL, addr, 48 BUID_HI(buid), BUID_LO(buid), 49 rtas_data_buf, 50 num_vfs * sizeof(struct pe_map_bar_entry)); 51 memcpy(vf_pe_array, rtas_data_buf, RTAS_DATA_BUF_SIZE); 52 spin_unlock(&rtas_data_buf_lock); 53 54 if (rc) 55 dev_err(&pdev->dev, 56 "%s: Failed to associate pes PE#%lx, rc=%x\n", 57 __func__, addr, rc); 58 59 return rc; 60 } 61 62 static void pseries_set_pe_num(struct pci_dev *pdev, u16 vf_index, __be16 pe_num) 63 { 64 struct pci_dn *pdn; 65 66 pdn = pci_get_pdn(pdev); 67 pdn->pe_num_map[vf_index] = be16_to_cpu(pe_num); 68 dev_dbg(&pdev->dev, "VF %04x:%02x:%02x.%x associated with PE#%x\n", 69 pci_domain_nr(pdev->bus), 70 pdev->bus->number, 71 PCI_SLOT(pci_iov_virtfn_devfn(pdev, vf_index)), 72 PCI_FUNC(pci_iov_virtfn_devfn(pdev, vf_index)), 73 pdn->pe_num_map[vf_index]); 74 } 75 76 static int pseries_associate_pes(struct pci_dev *pdev, u16 num_vfs) 77 { 78 struct pci_dn *pdn; 79 int i, rc, vf_index; 80 struct pe_map_bar_entry *vf_pe_array; 81 struct resource *res; 82 u64 size; 83 84 vf_pe_array = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); 85 if (!vf_pe_array) 86 return -ENOMEM; 87 88 pdn = pci_get_pdn(pdev); 89 /* create firmware structure to associate pes */ 90 for (vf_index = 0; vf_index < num_vfs; vf_index++) { 91 pdn->pe_num_map[vf_index] = IODA_INVALID_PE; 92 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 93 res = &pdev->resource[i + PCI_IOV_RESOURCES]; 94 if (!res->parent) 95 continue; 96 size = pcibios_iov_resource_alignment(pdev, i + 97 PCI_IOV_RESOURCES); 98 vf_pe_array[vf_index].bar = 99 cpu_to_be64(res->start + size * vf_index); 100 vf_pe_array[vf_index].rid = 101 cpu_to_be16((pci_iov_virtfn_bus(pdev, vf_index) 102 << 8) | pci_iov_virtfn_devfn(pdev, 103 vf_index)); 104 vf_pe_array[vf_index].pe_num = 105 cpu_to_be16(IODA_INVALID_PE); 106 } 107 } 108 109 rc = pseries_send_map_pe(pdev, num_vfs, vf_pe_array); 110 /* Only zero is success */ 111 if (!rc) 112 for (vf_index = 0; vf_index < num_vfs; vf_index++) 113 pseries_set_pe_num(pdev, vf_index, 114 vf_pe_array[vf_index].pe_num); 115 116 kfree(vf_pe_array); 117 return rc; 118 } 119 120 static int pseries_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs) 121 { 122 struct pci_dn *pdn; 123 int rc; 124 const int *max_vfs; 125 int max_config_vfs; 126 struct device_node *dn = pci_device_to_OF_node(pdev); 127 128 max_vfs = of_get_property(dn, "ibm,number-of-configurable-vfs", NULL); 129 130 if (!max_vfs) 131 return -EINVAL; 132 133 /* First integer stores max config */ 134 max_config_vfs = of_read_number(&max_vfs[0], 1); 135 if (max_config_vfs < num_vfs && num_vfs > MAX_VFS_FOR_MAP_PE) { 136 dev_err(&pdev->dev, 137 "Num VFs %x > %x Configurable VFs\n", 138 num_vfs, (num_vfs > MAX_VFS_FOR_MAP_PE) ? 139 MAX_VFS_FOR_MAP_PE : max_config_vfs); 140 return -EINVAL; 141 } 142 143 pdn = pci_get_pdn(pdev); 144 pdn->pe_num_map = kmalloc_objs(*pdn->pe_num_map, num_vfs); 145 if (!pdn->pe_num_map) 146 return -ENOMEM; 147 148 rc = pseries_associate_pes(pdev, num_vfs); 149 150 /* Anything other than zero is failure */ 151 if (rc) { 152 dev_err(&pdev->dev, "Failure to enable sriov: %x\n", rc); 153 kfree(pdn->pe_num_map); 154 } else { 155 pci_vf_drivers_autoprobe(pdev, false); 156 } 157 158 return rc; 159 } 160 161 static int pseries_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) 162 { 163 /* Allocate PCI data */ 164 add_sriov_vf_pdns(pdev); 165 return pseries_pci_sriov_enable(pdev, num_vfs); 166 } 167 168 static int pseries_pcibios_sriov_disable(struct pci_dev *pdev) 169 { 170 struct pci_dn *pdn; 171 172 pdn = pci_get_pdn(pdev); 173 /* Releasing pe_num_map */ 174 kfree(pdn->pe_num_map); 175 /* Release PCI data */ 176 remove_sriov_vf_pdns(pdev); 177 pci_vf_drivers_autoprobe(pdev, true); 178 return 0; 179 } 180 #endif 181 182 static void __init pSeries_request_regions(void) 183 { 184 if (!isa_io_base) 185 return; 186 187 request_region(0x20,0x20,"pic1"); 188 request_region(0xa0,0x20,"pic2"); 189 request_region(0x00,0x20,"dma1"); 190 request_region(0x40,0x20,"timer"); 191 request_region(0x80,0x10,"dma page reg"); 192 request_region(0xc0,0x20,"dma2"); 193 } 194 195 void __init pSeries_final_fixup(void) 196 { 197 pSeries_request_regions(); 198 199 eeh_show_enabled(); 200 201 #ifdef CONFIG_PCI_IOV 202 ppc_md.pcibios_sriov_enable = pseries_pcibios_sriov_enable; 203 ppc_md.pcibios_sriov_disable = pseries_pcibios_sriov_disable; 204 #endif 205 } 206 207 /* 208 * Assume the winbond 82c105 is the IDE controller on a 209 * p610/p615/p630. We should probably be more careful in case 210 * someone tries to plug in a similar adapter. 211 */ 212 static void fixup_winbond_82c105(struct pci_dev* dev) 213 { 214 struct resource *r; 215 unsigned int reg; 216 217 if (!machine_is(pseries)) 218 return; 219 220 printk("Using INTC for W82c105 IDE controller.\n"); 221 pci_read_config_dword(dev, 0x40, ®); 222 /* Enable LEGIRQ to use INTC instead of ISA interrupts */ 223 pci_write_config_dword(dev, 0x40, reg | (1<<11)); 224 225 pci_dev_for_each_resource(dev, r) { 226 /* zap the 2nd function of the winbond chip */ 227 if (dev->bus->number == 0 && dev->devfn == 0x81 && 228 r->flags & IORESOURCE_IO) 229 r->flags &= ~IORESOURCE_IO; 230 if (r->start == 0 && r->end) { 231 r->flags = 0; 232 r->end = 0; 233 } 234 } 235 } 236 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105, 237 fixup_winbond_82c105); 238 239 static enum pci_bus_speed prop_to_pci_speed(u32 prop) 240 { 241 switch (prop) { 242 case 0x01: 243 return PCIE_SPEED_2_5GT; 244 case 0x02: 245 return PCIE_SPEED_5_0GT; 246 case 0x04: 247 return PCIE_SPEED_8_0GT; 248 case 0x08: 249 return PCIE_SPEED_16_0GT; 250 case 0x10: 251 return PCIE_SPEED_32_0GT; 252 default: 253 pr_debug("Unexpected PCI link speed property value\n"); 254 return PCI_SPEED_UNKNOWN; 255 } 256 } 257 258 int pseries_root_bridge_prepare(struct pci_host_bridge *bridge) 259 { 260 struct device_node *dn, *pdn; 261 struct pci_bus *bus; 262 u32 pcie_link_speed_stats[2]; 263 int rc; 264 265 bus = bridge->bus; 266 267 /* Rely on the pcibios_free_controller_deferred() callback. */ 268 pci_set_host_bridge_release(bridge, pcibios_free_controller_deferred, 269 (void *) pci_bus_to_host(bus)); 270 271 dn = pcibios_get_phb_of_node(bus); 272 if (!dn) 273 return 0; 274 275 for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(pdn)) { 276 rc = of_property_read_u32_array(pdn, 277 "ibm,pcie-link-speed-stats", 278 &pcie_link_speed_stats[0], 2); 279 if (!rc) 280 break; 281 } 282 283 of_node_put(pdn); 284 285 if (rc) { 286 pr_debug("no ibm,pcie-link-speed-stats property\n"); 287 return 0; 288 } 289 290 bus->max_bus_speed = prop_to_pci_speed(pcie_link_speed_stats[0]); 291 bus->cur_bus_speed = prop_to_pci_speed(pcie_link_speed_stats[1]); 292 return 0; 293 } 294