1 /* 2 * Common routines for Tundra Semiconductor TSI108 host bridge. 3 * 4 * 2004-2005 (c) Tundra Semiconductor Corp. 5 * Author: Alex Bounine (alexandreb@tundra.com) 6 * Author: Roy Zang (tie-fei.zang@freescale.com) 7 * Add pci interrupt router host 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the Free 11 * Software Foundation; either version 2 of the License, or (at your option) 12 * any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 17 * more details. 18 * 19 * You should have received a copy of the GNU General Public License along with 20 * this program; if not, write to the Free Software Foundation, Inc., 59 21 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/init.h> 26 #include <linux/pci.h> 27 #include <linux/irq.h> 28 #include <linux/interrupt.h> 29 30 #include <asm/byteorder.h> 31 #include <asm/io.h> 32 #include <asm/irq.h> 33 #include <asm/uaccess.h> 34 #include <asm/machdep.h> 35 #include <asm/pci-bridge.h> 36 #include <asm/tsi108.h> 37 #include <asm/tsi108_pci.h> 38 #include <asm/tsi108_irq.h> 39 #include <asm/prom.h> 40 41 #undef DEBUG 42 #ifdef DEBUG 43 #define DBG(x...) printk(x) 44 #else 45 #define DBG(x...) 46 #endif 47 48 #define tsi_mk_config_addr(bus, devfunc, offset) \ 49 ((((bus)<<16) | ((devfunc)<<8) | (offset & 0xfc)) + tsi108_pci_cfg_base) 50 51 u32 tsi108_pci_cfg_base; 52 static u32 tsi108_pci_cfg_phys; 53 u32 tsi108_csr_vir_base; 54 static struct irq_domain *pci_irq_host; 55 56 extern u32 get_vir_csrbase(void); 57 extern u32 tsi108_read_reg(u32 reg_offset); 58 extern void tsi108_write_reg(u32 reg_offset, u32 val); 59 60 int 61 tsi108_direct_write_config(struct pci_bus *bus, unsigned int devfunc, 62 int offset, int len, u32 val) 63 { 64 volatile unsigned char *cfg_addr; 65 struct pci_controller *hose = pci_bus_to_host(bus); 66 67 if (ppc_md.pci_exclude_device) 68 if (ppc_md.pci_exclude_device(hose, bus->number, devfunc)) 69 return PCIBIOS_DEVICE_NOT_FOUND; 70 71 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number, 72 devfunc, offset) | 73 (offset & 0x03)); 74 75 #ifdef DEBUG 76 printk("PCI CFG write : "); 77 printk("%d:0x%x:0x%x ", bus->number, devfunc, offset); 78 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr); 79 printk("data = 0x%08x\n", val); 80 #endif 81 82 switch (len) { 83 case 1: 84 out_8((u8 *) cfg_addr, val); 85 break; 86 case 2: 87 out_le16((u16 *) cfg_addr, val); 88 break; 89 default: 90 out_le32((u32 *) cfg_addr, val); 91 break; 92 } 93 94 return PCIBIOS_SUCCESSFUL; 95 } 96 97 void tsi108_clear_pci_error(u32 pci_cfg_base) 98 { 99 u32 err_stat, err_addr, pci_stat; 100 101 /* 102 * Quietly clear PB and PCI error flags set as result 103 * of PCI/X configuration read requests. 104 */ 105 106 /* Read PB Error Log Registers */ 107 108 err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS); 109 err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR); 110 111 if (err_stat & TSI108_PB_ERRCS_ES) { 112 /* Clear error flag */ 113 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS, 114 TSI108_PB_ERRCS_ES); 115 116 /* Clear read error reported in PB_ISR */ 117 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR, 118 TSI108_PB_ISR_PBS_RD_ERR); 119 120 /* Clear PCI/X bus cfg errors if applicable */ 121 if ((err_addr & 0xFF000000) == pci_cfg_base) { 122 pci_stat = 123 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR); 124 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR, 125 pci_stat); 126 } 127 } 128 129 return; 130 } 131 132 #define __tsi108_read_pci_config(x, addr, op) \ 133 __asm__ __volatile__( \ 134 " "op" %0,0,%1\n" \ 135 "1: eieio\n" \ 136 "2:\n" \ 137 ".section .fixup,\"ax\"\n" \ 138 "3: li %0,-1\n" \ 139 " b 2b\n" \ 140 ".section __ex_table,\"a\"\n" \ 141 " .align 2\n" \ 142 " .long 1b,3b\n" \ 143 ".text" \ 144 : "=r"(x) : "r"(addr)) 145 146 int 147 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset, 148 int len, u32 * val) 149 { 150 volatile unsigned char *cfg_addr; 151 struct pci_controller *hose = pci_bus_to_host(bus); 152 u32 temp; 153 154 if (ppc_md.pci_exclude_device) 155 if (ppc_md.pci_exclude_device(hose, bus->number, devfn)) 156 return PCIBIOS_DEVICE_NOT_FOUND; 157 158 cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number, 159 devfn, 160 offset) | (offset & 161 0x03)); 162 163 switch (len) { 164 case 1: 165 __tsi108_read_pci_config(temp, cfg_addr, "lbzx"); 166 break; 167 case 2: 168 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx"); 169 break; 170 default: 171 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx"); 172 break; 173 } 174 175 *val = temp; 176 177 #ifdef DEBUG 178 if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) { 179 printk("PCI CFG read : "); 180 printk("%d:0x%x:0x%x ", bus->number, devfn, offset); 181 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr); 182 printk("data = 0x%x\n", *val); 183 } 184 #endif 185 return PCIBIOS_SUCCESSFUL; 186 } 187 188 void tsi108_clear_pci_cfg_error(void) 189 { 190 tsi108_clear_pci_error(tsi108_pci_cfg_phys); 191 } 192 193 static struct pci_ops tsi108_direct_pci_ops = { 194 .read = tsi108_direct_read_config, 195 .write = tsi108_direct_write_config, 196 }; 197 198 int __init tsi108_setup_pci(struct device_node *dev, u32 cfg_phys, int primary) 199 { 200 int len; 201 struct pci_controller *hose; 202 struct resource rsrc; 203 const int *bus_range; 204 int has_address = 0; 205 206 /* PCI Config mapping */ 207 tsi108_pci_cfg_base = (u32)ioremap(cfg_phys, TSI108_PCI_CFG_SIZE); 208 tsi108_pci_cfg_phys = cfg_phys; 209 DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __func__, 210 tsi108_pci_cfg_base); 211 212 /* Fetch host bridge registers address */ 213 has_address = (of_address_to_resource(dev, 0, &rsrc) == 0); 214 215 /* Get bus range if any */ 216 bus_range = of_get_property(dev, "bus-range", &len); 217 if (bus_range == NULL || len < 2 * sizeof(int)) { 218 printk(KERN_WARNING "Can't get bus-range for %s, assume" 219 " bus 0\n", dev->full_name); 220 } 221 222 hose = pcibios_alloc_controller(dev); 223 224 if (!hose) { 225 printk("PCI Host bridge init failed\n"); 226 return -ENOMEM; 227 } 228 229 hose->first_busno = bus_range ? bus_range[0] : 0; 230 hose->last_busno = bus_range ? bus_range[1] : 0xff; 231 232 (hose)->ops = &tsi108_direct_pci_ops; 233 234 printk(KERN_INFO "Found tsi108 PCI host bridge at 0x%08x. " 235 "Firmware bus number: %d->%d\n", 236 rsrc.start, hose->first_busno, hose->last_busno); 237 238 /* Interpret the "ranges" property */ 239 /* This also maps the I/O region and sets isa_io/mem_base */ 240 pci_process_bridge_OF_ranges(hose, dev, primary); 241 return 0; 242 } 243 244 /* 245 * Low level utility functions 246 */ 247 248 static void tsi108_pci_int_mask(u_int irq) 249 { 250 u_int irp_cfg; 251 int int_line = (irq - IRQ_PCI_INTAD_BASE); 252 253 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL); 254 mb(); 255 irp_cfg |= (1 << int_line); /* INTx_DIR = output */ 256 irp_cfg &= ~(3 << (8 + (int_line * 2))); /* INTx_TYPE = unused */ 257 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg); 258 mb(); 259 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL); 260 } 261 262 static void tsi108_pci_int_unmask(u_int irq) 263 { 264 u_int irp_cfg; 265 int int_line = (irq - IRQ_PCI_INTAD_BASE); 266 267 irp_cfg = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL); 268 mb(); 269 irp_cfg &= ~(1 << int_line); 270 irp_cfg |= (3 << (8 + (int_line * 2))); 271 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, irp_cfg); 272 mb(); 273 } 274 275 static void init_pci_source(void) 276 { 277 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL, 278 0x0000ff00); 279 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE, 280 TSI108_PCI_IRP_ENABLE_P_INT); 281 mb(); 282 } 283 284 static inline unsigned int get_pci_source(void) 285 { 286 u_int temp = 0; 287 int irq = -1; 288 int i; 289 u_int pci_irp_stat; 290 static int mask = 0; 291 292 /* Read PCI/X block interrupt status register */ 293 pci_irp_stat = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT); 294 mb(); 295 296 if (pci_irp_stat & TSI108_PCI_IRP_STAT_P_INT) { 297 /* Process Interrupt from PCI bus INTA# - INTD# lines */ 298 temp = 299 tsi108_read_reg(TSI108_PCI_OFFSET + 300 TSI108_PCI_IRP_INTAD) & 0xf; 301 mb(); 302 for (i = 0; i < 4; i++, mask++) { 303 if (temp & (1 << mask % 4)) { 304 irq = IRQ_PCI_INTA + mask % 4; 305 mask++; 306 break; 307 } 308 } 309 310 /* Disable interrupts from PCI block */ 311 temp = tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE); 312 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE, 313 temp & ~TSI108_PCI_IRP_ENABLE_P_INT); 314 mb(); 315 (void)tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE); 316 mb(); 317 } 318 #ifdef DEBUG 319 else { 320 printk("TSI108_PIC: error in TSI108_PCI_IRP_STAT\n"); 321 pci_irp_stat = 322 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_STAT); 323 temp = 324 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_INTAD); 325 mb(); 326 printk(">> stat=0x%08x intad=0x%08x ", pci_irp_stat, temp); 327 temp = 328 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_CFG_CTL); 329 mb(); 330 printk("cfg_ctl=0x%08x ", temp); 331 temp = 332 tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE); 333 mb(); 334 printk("irp_enable=0x%08x\n", temp); 335 } 336 #endif /* end of DEBUG */ 337 338 return irq; 339 } 340 341 342 /* 343 * Linux descriptor level callbacks 344 */ 345 346 static void tsi108_pci_irq_unmask(struct irq_data *d) 347 { 348 tsi108_pci_int_unmask(d->irq); 349 350 /* Enable interrupts from PCI block */ 351 tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE, 352 tsi108_read_reg(TSI108_PCI_OFFSET + 353 TSI108_PCI_IRP_ENABLE) | 354 TSI108_PCI_IRP_ENABLE_P_INT); 355 mb(); 356 } 357 358 static void tsi108_pci_irq_mask(struct irq_data *d) 359 { 360 tsi108_pci_int_mask(d->irq); 361 } 362 363 static void tsi108_pci_irq_ack(struct irq_data *d) 364 { 365 tsi108_pci_int_mask(d->irq); 366 } 367 368 /* 369 * Interrupt controller descriptor for cascaded PCI interrupt controller. 370 */ 371 372 static struct irq_chip tsi108_pci_irq = { 373 .name = "tsi108_PCI_int", 374 .irq_mask = tsi108_pci_irq_mask, 375 .irq_ack = tsi108_pci_irq_ack, 376 .irq_unmask = tsi108_pci_irq_unmask, 377 }; 378 379 static int pci_irq_host_xlate(struct irq_domain *h, struct device_node *ct, 380 const u32 *intspec, unsigned int intsize, 381 irq_hw_number_t *out_hwirq, unsigned int *out_flags) 382 { 383 *out_hwirq = intspec[0]; 384 *out_flags = IRQ_TYPE_LEVEL_HIGH; 385 return 0; 386 } 387 388 static int pci_irq_host_map(struct irq_domain *h, unsigned int virq, 389 irq_hw_number_t hw) 390 { unsigned int irq; 391 DBG("%s(%d, 0x%lx)\n", __func__, virq, hw); 392 if ((virq >= 1) && (virq <= 4)){ 393 irq = virq + IRQ_PCI_INTAD_BASE - 1; 394 irq_set_status_flags(irq, IRQ_LEVEL); 395 irq_set_chip(irq, &tsi108_pci_irq); 396 } 397 return 0; 398 } 399 400 static const struct irq_domain_ops pci_irq_domain_ops = { 401 .map = pci_irq_host_map, 402 .xlate = pci_irq_host_xlate, 403 }; 404 405 /* 406 * Exported functions 407 */ 408 409 /* 410 * The Tsi108 PCI interrupts initialization routine. 411 * 412 * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block 413 * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the 414 * PCI block has to be treated as a cascaded interrupt controller connected 415 * to the MPIC. 416 */ 417 418 void __init tsi108_pci_int_init(struct device_node *node) 419 { 420 DBG("Tsi108_pci_int_init: initializing PCI interrupts\n"); 421 422 pci_irq_host = irq_domain_add_legacy_isa(node, &pci_irq_domain_ops, NULL); 423 if (pci_irq_host == NULL) { 424 printk(KERN_ERR "pci_irq_host: failed to allocate irq domain!\n"); 425 return; 426 } 427 428 init_pci_source(); 429 } 430 431 void tsi108_irq_cascade(struct irq_desc *desc) 432 { 433 struct irq_chip *chip = irq_desc_get_chip(desc); 434 unsigned int cascade_irq = get_pci_source(); 435 436 if (cascade_irq != NO_IRQ) 437 generic_handle_irq(cascade_irq); 438 439 chip->irq_eoi(&desc->irq_data); 440 } 441