arch/powerpc/sysdev/tsi108_pci.c

   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/slab.h>
  28 #include <linux/irq.h>
  29 #include <linux/interrupt.h>
  30
  31 #include <asm/byteorder.h>
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/machdep.h>
  36 #include <asm/pci-bridge.h>
  37 #include <asm/tsi108.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 u32 tsi108_csr_vir_base;
  53 static struct device_node *pci_irq_node;
  54 static struct irq_host *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
  66         if (ppc_md.pci_exclude_device)
  67                 if (ppc_md.pci_exclude_device(bus->number, devfunc))
  68                         return PCIBIOS_DEVICE_NOT_FOUND;
  69
  70         cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
  71                                                         devfunc, offset) |
  72                                                         (offset & 0x03));
  73
  74 #ifdef DEBUG
  75         printk("PCI CFG write : ");
  76         printk("%d:0x%x:0x%x ", bus->number, devfunc, offset);
  77         printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
  78         printk("data = 0x%08x\n", val);
  79 #endif
  80
  81         switch (len) {
  82         case 1:
  83                 out_8((u8 *) cfg_addr, val);
  84                 break;
  85         case 2:
  86                 out_le16((u16 *) cfg_addr, val);
  87                 break;
  88         default:
  89                 out_le32((u32 *) cfg_addr, val);
  90                 break;
  91         }
  92
  93         return PCIBIOS_SUCCESSFUL;
  94 }
  95
  96 void tsi108_clear_pci_error(u32 pci_cfg_base)
  97 {
  98         u32 err_stat, err_addr, pci_stat;
  99
 100         /*
 101          * Quietly clear PB and PCI error flags set as result
 102          * of PCI/X configuration read requests.
 103          */
 104
 105         /* Read PB Error Log Registers */
 106
 107         err_stat = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS);
 108         err_addr = tsi108_read_reg(TSI108_PB_OFFSET + TSI108_PB_AERR);
 109
 110         if (err_stat & TSI108_PB_ERRCS_ES) {
 111                 /* Clear error flag */
 112                 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ERRCS,
 113                                  TSI108_PB_ERRCS_ES);
 114
 115                 /* Clear read error reported in PB_ISR */
 116                 tsi108_write_reg(TSI108_PB_OFFSET + TSI108_PB_ISR,
 117                                  TSI108_PB_ISR_PBS_RD_ERR);
 118
 119                 /* Clear PCI/X bus cfg errors if applicable */
 120                 if ((err_addr & 0xFF000000) == pci_cfg_base) {
 121                         pci_stat =
 122                             tsi108_read_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR);
 123                         tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_CSR,
 124                                          pci_stat);
 125                 }
 126         }
 127
 128         return;
 129 }
 130
 131 #define __tsi108_read_pci_config(x, addr, op)           \
 132         __asm__ __volatile__(                           \
 133                 "       "op" %0,0,%1\n"         \
 134                 "1:     eieio\n"                        \
 135                 "2:\n"                                  \
 136                 ".section .fixup,\"ax\"\n"              \
 137                 "3:     li %0,-1\n"                     \
 138                 "       b 2b\n"                         \
 139                 ".section __ex_table,\"a\"\n"           \
 140                 "       .align 2\n"                     \
 141                 "       .long 1b,3b\n"                  \
 142                 ".text"                                 \
 143                 : "=r"(x) : "r"(addr))
 144
 145 int
 146 tsi108_direct_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
 147                           int len, u32 * val)
 148 {
 149         volatile unsigned char *cfg_addr;
 150         u32 temp;
 151
 152         if (ppc_md.pci_exclude_device)
 153                 if (ppc_md.pci_exclude_device(bus->number, devfn))
 154                         return PCIBIOS_DEVICE_NOT_FOUND;
 155
 156         cfg_addr = (unsigned char *)(tsi_mk_config_addr(bus->number,
 157                                                         devfn,
 158                                                         offset) | (offset &
 159                                                                    0x03));
 160
 161         switch (len) {
 162         case 1:
 163                 __tsi108_read_pci_config(temp, cfg_addr, "lbzx");
 164                 break;
 165         case 2:
 166                 __tsi108_read_pci_config(temp, cfg_addr, "lhbrx");
 167                 break;
 168         default:
 169                 __tsi108_read_pci_config(temp, cfg_addr, "lwbrx");
 170                 break;
 171         }
 172
 173         *val = temp;
 174
 175 #ifdef DEBUG
 176         if ((0xFFFFFFFF != temp) && (0xFFFF != temp) && (0xFF != temp)) {
 177                 printk("PCI CFG read : ");
 178                 printk("%d:0x%x:0x%x ", bus->number, devfn, offset);
 179                 printk("%d ADDR=0x%08x ", len, (uint) cfg_addr);
 180                 printk("data = 0x%x\n", *val);
 181         }
 182 #endif
 183         return PCIBIOS_SUCCESSFUL;
 184 }
 185
 186 void tsi108_clear_pci_cfg_error(void)
 187 {
 188         tsi108_clear_pci_error(TSI108_PCI_CFG_BASE_PHYS);
 189 }
 190
 191 static struct pci_ops tsi108_direct_pci_ops = {
 192         tsi108_direct_read_config,
 193         tsi108_direct_write_config
 194 };
 195
 196 int __init tsi108_setup_pci(struct device_node *dev)
 197 {
 198         int len;
 199         struct pci_controller *hose;
 200         struct resource rsrc;
 201         const int *bus_range;
 202         int primary = 0, has_address = 0;
 203
 204         /* PCI Config mapping */
 205         tsi108_pci_cfg_base = (u32)ioremap(TSI108_PCI_CFG_BASE_PHYS,
 206                         TSI108_PCI_CFG_SIZE);
 207         DBG("TSI_PCI: %s tsi108_pci_cfg_base=0x%x\n", __FUNCTION__,
 208             tsi108_pci_cfg_base);
 209
 210         /* Fetch host bridge registers address */
 211         has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
 212
 213         /* Get bus range if any */
 214         bus_range = of_get_property(dev, "bus-range", &len);
 215         if (bus_range == NULL || len < 2 * sizeof(int)) {
 216                 printk(KERN_WARNING "Can't get bus-range for %s, assume"
 217                        " bus 0\n", dev->full_name);
 218         }
 219
 220         hose = pcibios_alloc_controller();
 221
 222         if (!hose) {
 223                 printk("PCI Host bridge init failed\n");
 224                 return -ENOMEM;
 225         }
 226         hose->arch_data = dev;
 227         hose->set_cfg_type = 1;
 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_enable(u_int irq)
 347 {
 348         tsi108_pci_int_unmask(irq);
 349 }
 350
 351 static void tsi108_pci_irq_disable(u_int irq)
 352 {
 353         tsi108_pci_int_mask(irq);
 354 }
 355
 356 static void tsi108_pci_irq_ack(u_int irq)
 357 {
 358         tsi108_pci_int_mask(irq);
 359 }
 360
 361 static void tsi108_pci_irq_end(u_int irq)
 362 {
 363         tsi108_pci_int_unmask(irq);
 364
 365         /* Enable interrupts from PCI block */
 366         tsi108_write_reg(TSI108_PCI_OFFSET + TSI108_PCI_IRP_ENABLE,
 367                          tsi108_read_reg(TSI108_PCI_OFFSET +
 368                                          TSI108_PCI_IRP_ENABLE) |
 369                          TSI108_PCI_IRP_ENABLE_P_INT);
 370         mb();
 371 }
 372
 373 /*
 374  * Interrupt controller descriptor for cascaded PCI interrupt controller.
 375  */
 376
 377 static struct irq_chip tsi108_pci_irq = {
 378         .typename = "tsi108_PCI_int",
 379         .mask = tsi108_pci_irq_disable,
 380         .ack = tsi108_pci_irq_ack,
 381         .end = tsi108_pci_irq_end,
 382         .unmask = tsi108_pci_irq_enable,
 383 };
 384
 385 static int pci_irq_host_xlate(struct irq_host *h, struct device_node *ct,
 386                             u32 *intspec, unsigned int intsize,
 387                             irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 388 {
 389         *out_hwirq = intspec[0];
 390         *out_flags = IRQ_TYPE_LEVEL_HIGH;
 391         return 0;
 392 }
 393
 394 static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
 395                           irq_hw_number_t hw)
 396 {       unsigned int irq;
 397         DBG("%s(%d, 0x%lx)\n", __FUNCTION__, virq, hw);
 398         if ((virq >= 1) && (virq <= 4)){
 399                 irq = virq + IRQ_PCI_INTAD_BASE - 1;
 400                 get_irq_desc(irq)->status |= IRQ_LEVEL;
 401                 set_irq_chip(irq, &tsi108_pci_irq);
 402         }
 403         return 0;
 404 }
 405
 406 static int pci_irq_host_match(struct irq_host *h, struct device_node *node)
 407 {
 408         return pci_irq_node == node;
 409 }
 410
 411 static struct irq_host_ops pci_irq_host_ops = {
 412         .match = pci_irq_host_match,
 413         .map = pci_irq_host_map,
 414         .xlate = pci_irq_host_xlate,
 415 };
 416
 417 /*
 418  * Exported functions
 419  */
 420
 421 /*
 422  * The Tsi108 PCI interrupts initialization routine.
 423  *
 424  * The INTA# - INTD# interrupts on the PCI bus are reported by the PCI block
 425  * to the MPIC using single interrupt source (IRQ_TSI108_PCI). Therefore the
 426  * PCI block has to be treated as a cascaded interrupt controller connected
 427  * to the MPIC.
 428  */
 429
 430 void __init tsi108_pci_int_init(struct device_node *node)
 431 {
 432         DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
 433
 434         pci_irq_node = of_node_get(node);
 435         pci_irq_host = irq_alloc_host(IRQ_HOST_MAP_LEGACY, 0, &pci_irq_host_ops, 0);
 436         if (pci_irq_host == NULL) {
 437                 printk(KERN_ERR "pci_irq_host: failed to allocate irq host !\n");
 438                 return;
 439         }
 440
 441         init_pci_source();
 442 }
 443
 444 void tsi108_irq_cascade(unsigned int irq, struct irq_desc *desc)
 445 {
 446         unsigned int cascade_irq = get_pci_source();
 447         if (cascade_irq != NO_IRQ)
 448                 generic_handle_irq(cascade_irq);
 449         desc->chip->eoi(irq);
 450 }