arch/mips/pci/pci-xlr.c

   1 /*
   2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3  * reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the NetLogic
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/types.h>
  36 #include <linux/pci.h>
  37 #include <linux/kernel.h>
  38 #include <linux/init.h>
  39 #include <linux/msi.h>
  40 #include <linux/mm.h>
  41 #include <linux/irq.h>
  42 #include <linux/irqdesc.h>
  43 #include <linux/console.h>
  44 #include <linux/pci_regs.h>
  45
  46 #include <asm/io.h>
  47
  48 #include <asm/netlogic/interrupt.h>
  49 #include <asm/netlogic/haldefs.h>
  50 #include <asm/netlogic/common.h>
  51
  52 #include <asm/netlogic/xlr/msidef.h>
  53 #include <asm/netlogic/xlr/iomap.h>
  54 #include <asm/netlogic/xlr/pic.h>
  55 #include <asm/netlogic/xlr/xlr.h>
  56
  57 static void *pci_config_base;
  58
  59 #define pci_cfg_addr(bus, devfn, off) (((bus) << 16) | ((devfn) << 8) | (off))
  60
  61 /* PCI ops */
  62 static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
  63         int where)
  64 {
  65         u32 data;
  66         u32 *cfgaddr;
  67
  68         cfgaddr = (u32 *)(pci_config_base +
  69                         pci_cfg_addr(bus->number, devfn, where & ~3));
  70         data = *cfgaddr;
  71         return cpu_to_le32(data);
  72 }
  73
  74 static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
  75         int where, u32 data)
  76 {
  77         u32 *cfgaddr;
  78
  79         cfgaddr = (u32 *)(pci_config_base +
  80                         pci_cfg_addr(bus->number, devfn, where & ~3));
  81         *cfgaddr = cpu_to_le32(data);
  82 }
  83
  84 static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
  85         int where, int size, u32 *val)
  86 {
  87         u32 data;
  88
  89         if ((size == 2) && (where & 1))
  90                 return PCIBIOS_BAD_REGISTER_NUMBER;
  91         else if ((size == 4) && (where & 3))
  92                 return PCIBIOS_BAD_REGISTER_NUMBER;
  93
  94         data = pci_cfg_read_32bit(bus, devfn, where);
  95
  96         if (size == 1)
  97                 *val = (data >> ((where & 3) << 3)) & 0xff;
  98         else if (size == 2)
  99                 *val = (data >> ((where & 3) << 3)) & 0xffff;
 100         else
 101                 *val = data;
 102
 103         return PCIBIOS_SUCCESSFUL;
 104 }
 105
 106
 107 static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 108                 int where, int size, u32 val)
 109 {
 110         u32 data;
 111
 112         if ((size == 2) && (where & 1))
 113                 return PCIBIOS_BAD_REGISTER_NUMBER;
 114         else if ((size == 4) && (where & 3))
 115                 return PCIBIOS_BAD_REGISTER_NUMBER;
 116
 117         data = pci_cfg_read_32bit(bus, devfn, where);
 118
 119         if (size == 1)
 120                 data = (data & ~(0xff << ((where & 3) << 3))) |
 121                         (val << ((where & 3) << 3));
 122         else if (size == 2)
 123                 data = (data & ~(0xffff << ((where & 3) << 3))) |
 124                         (val << ((where & 3) << 3));
 125         else
 126                 data = val;
 127
 128         pci_cfg_write_32bit(bus, devfn, where, data);
 129
 130         return PCIBIOS_SUCCESSFUL;
 131 }
 132
 133 struct pci_ops nlm_pci_ops = {
 134         .read  = nlm_pcibios_read,
 135         .write = nlm_pcibios_write
 136 };
 137
 138 static struct resource nlm_pci_mem_resource = {
 139         .name           = "XLR PCI MEM",
 140         .start          = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
 141         .end            = 0xdfffffffUL,
 142         .flags          = IORESOURCE_MEM,
 143 };
 144
 145 static struct resource nlm_pci_io_resource = {
 146         .name           = "XLR IO MEM",
 147         .start          = 0x10000000UL, /* 16MB PCI IO @ 0x1000_0000 */
 148         .end            = 0x100fffffUL,
 149         .flags          = IORESOURCE_IO,
 150 };
 151
 152 struct pci_controller nlm_pci_controller = {
 153         .index          = 0,
 154         .pci_ops        = &nlm_pci_ops,
 155         .mem_resource   = &nlm_pci_mem_resource,
 156         .mem_offset     = 0x00000000UL,
 157         .io_resource    = &nlm_pci_io_resource,
 158         .io_offset      = 0x00000000UL,
 159 };
 160
 161 /*
 162  * The top level PCIe links on the XLS PCIe controller appear as
 163  * bridges. Given a device, this function finds which link it is
 164  * on.
 165  */
 166 static struct pci_dev *xls_get_pcie_link(const struct pci_dev *dev)
 167 {
 168         struct pci_bus *bus, *p;
 169
 170         /* Find the bridge on bus 0 */
 171         bus = dev->bus;
 172         for (p = bus->parent; p && p->number != 0; p = p->parent)
 173                 bus = p;
 174
 175         return p ? bus->self : NULL;
 176 }
 177
 178 static int nlm_pci_link_to_irq(int link)
 179 {
 180         switch  (link) {
 181         case 0:
 182                 return PIC_PCIE_LINK0_IRQ;
 183         case 1:
 184                 return PIC_PCIE_LINK1_IRQ;
 185         case 2:
 186                 if (nlm_chip_is_xls_b())
 187                         return PIC_PCIE_XLSB0_LINK2_IRQ;
 188                 else
 189                         return PIC_PCIE_LINK2_IRQ;
 190         case 3:
 191                 if (nlm_chip_is_xls_b())
 192                         return PIC_PCIE_XLSB0_LINK3_IRQ;
 193                 else
 194                         return PIC_PCIE_LINK3_IRQ;
 195         }
 196         WARN(1, "Unexpected link %d\n", link);
 197         return 0;
 198 }
 199
 200 static int get_irq_vector(const struct pci_dev *dev)
 201 {
 202         struct pci_dev *lnk;
 203         int link;
 204
 205         if (!nlm_chip_is_xls())
 206                 return  PIC_PCIX_IRQ;   /* for XLR just one IRQ */
 207
 208         lnk = xls_get_pcie_link(dev);
 209         if (lnk == NULL)
 210                 return 0;
 211
 212         link = PCI_SLOT(lnk->devfn);
 213         return nlm_pci_link_to_irq(link);
 214 }
 215
 216 #ifdef CONFIG_PCI_MSI
 217 void arch_teardown_msi_irq(unsigned int irq)
 218 {
 219 }
 220
 221 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 222 {
 223         struct msi_msg msg;
 224         struct pci_dev *lnk;
 225         int irq, ret;
 226         u16 val;
 227
 228         /* MSI not supported on XLR */
 229         if (!nlm_chip_is_xls())
 230                 return 1;
 231
 232         /*
 233          * Enable MSI on the XLS PCIe controller bridge which was disabled
 234          * at enumeration, the bridge MSI capability is at 0x50
 235          */
 236         lnk = xls_get_pcie_link(dev);
 237         if (lnk == NULL)
 238                 return 1;
 239
 240         pci_read_config_word(lnk, 0x50 + PCI_MSI_FLAGS, &val);
 241         if ((val & PCI_MSI_FLAGS_ENABLE) == 0) {
 242                 val |= PCI_MSI_FLAGS_ENABLE;
 243                 pci_write_config_word(lnk, 0x50 + PCI_MSI_FLAGS, val);
 244         }
 245
 246         irq = get_irq_vector(dev);
 247         if (irq <= 0)
 248                 return 1;
 249
 250         msg.address_hi = MSI_ADDR_BASE_HI;
 251         msg.address_lo = MSI_ADDR_BASE_LO   |
 252                 MSI_ADDR_DEST_MODE_PHYSICAL |
 253                 MSI_ADDR_REDIRECTION_CPU;
 254
 255         msg.data = MSI_DATA_TRIGGER_EDGE |
 256                 MSI_DATA_LEVEL_ASSERT    |
 257                 MSI_DATA_DELIVERY_FIXED;
 258
 259         ret = irq_set_msi_desc(irq, desc);
 260         if (ret < 0)
 261                 return ret;
 262
 263         pci_write_msi_msg(irq, &msg);
 264         return 0;
 265 }
 266 #endif
 267
 268 /* Extra ACK needed for XLR on chip PCI controller */
 269 static void xlr_pci_ack(struct irq_data *d)
 270 {
 271         uint64_t pcibase = nlm_mmio_base(NETLOGIC_IO_PCIX_OFFSET);
 272
 273         nlm_read_reg(pcibase, (0x140 >> 2));
 274 }
 275
 276 /* Extra ACK needed for XLS on chip PCIe controller */
 277 static void xls_pcie_ack(struct irq_data *d)
 278 {
 279         uint64_t pciebase_le = nlm_mmio_base(NETLOGIC_IO_PCIE_1_OFFSET);
 280
 281         switch (d->irq) {
 282         case PIC_PCIE_LINK0_IRQ:
 283                 nlm_write_reg(pciebase_le, (0x90 >> 2), 0xffffffff);
 284                 break;
 285         case PIC_PCIE_LINK1_IRQ:
 286                 nlm_write_reg(pciebase_le, (0x94 >> 2), 0xffffffff);
 287                 break;
 288         case PIC_PCIE_LINK2_IRQ:
 289                 nlm_write_reg(pciebase_le, (0x190 >> 2), 0xffffffff);
 290                 break;
 291         case PIC_PCIE_LINK3_IRQ:
 292                 nlm_write_reg(pciebase_le, (0x194 >> 2), 0xffffffff);
 293                 break;
 294         }
 295 }
 296
 297 /* For XLS B silicon, the 3,4 PCI interrupts are different */
 298 static void xls_pcie_ack_b(struct irq_data *d)
 299 {
 300         uint64_t pciebase_le = nlm_mmio_base(NETLOGIC_IO_PCIE_1_OFFSET);
 301
 302         switch (d->irq) {
 303         case PIC_PCIE_LINK0_IRQ:
 304                 nlm_write_reg(pciebase_le, (0x90 >> 2), 0xffffffff);
 305                 break;
 306         case PIC_PCIE_LINK1_IRQ:
 307                 nlm_write_reg(pciebase_le, (0x94 >> 2), 0xffffffff);
 308                 break;
 309         case PIC_PCIE_XLSB0_LINK2_IRQ:
 310                 nlm_write_reg(pciebase_le, (0x190 >> 2), 0xffffffff);
 311                 break;
 312         case PIC_PCIE_XLSB0_LINK3_IRQ:
 313                 nlm_write_reg(pciebase_le, (0x194 >> 2), 0xffffffff);
 314                 break;
 315         }
 316 }
 317
 318 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 319 {
 320         return get_irq_vector(dev);
 321 }
 322
 323 /* Do platform specific device initialization at pci_enable_device() time */
 324 int pcibios_plat_dev_init(struct pci_dev *dev)
 325 {
 326         return 0;
 327 }
 328
 329 static int __init pcibios_init(void)
 330 {
 331         void (*extra_ack)(struct irq_data *);
 332         int link, irq;
 333
 334         /* PSB assigns PCI resources */
 335         pci_set_flags(PCI_PROBE_ONLY);
 336         pci_config_base = ioremap(DEFAULT_PCI_CONFIG_BASE, 16 << 20);
 337
 338         /* Extend IO port for memory mapped io */
 339         ioport_resource.start =  0;
 340         ioport_resource.end   = ~0;
 341
 342         set_io_port_base(CKSEG1);
 343         nlm_pci_controller.io_map_base = CKSEG1;
 344
 345         pr_info("Registering XLR/XLS PCIX/PCIE Controller.\n");
 346         register_pci_controller(&nlm_pci_controller);
 347
 348         /*
 349          * For PCI interrupts, we need to ack the PCI controller too, overload
 350          * irq handler data to do this
 351          */
 352         if (!nlm_chip_is_xls()) {
 353                 /* XLR PCI controller ACK */
 354                 nlm_set_pic_extra_ack(0, PIC_PCIX_IRQ, xlr_pci_ack);
 355         } else {
 356                 if  (nlm_chip_is_xls_b())
 357                         extra_ack = xls_pcie_ack_b;
 358                 else
 359                         extra_ack = xls_pcie_ack;
 360                 for (link = 0; link < 4; link++) {
 361                         irq = nlm_pci_link_to_irq(link);
 362                         nlm_set_pic_extra_ack(0, irq, extra_ack);
 363                 }
 364         }
 365         return 0;
 366 }
 367
 368 arch_initcall(pcibios_init);