arch/mips/pci/pci-xlp.c

   1 /*
   2  * Copyright (c) 2003-2012 Broadcom Corporation
   3  * All Rights 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 Broadcom
   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 BROADCOM ``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 BROADCOM 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
  45 #include <asm/io.h>
  46
  47 #include <asm/netlogic/interrupt.h>
  48 #include <asm/netlogic/haldefs.h>
  49 #include <asm/netlogic/common.h>
  50 #include <asm/netlogic/mips-extns.h>
  51
  52 #include <asm/netlogic/xlp-hal/iomap.h>
  53 #include <asm/netlogic/xlp-hal/xlp.h>
  54 #include <asm/netlogic/xlp-hal/pic.h>
  55 #include <asm/netlogic/xlp-hal/pcibus.h>
  56 #include <asm/netlogic/xlp-hal/bridge.h>
  57
  58 static void *pci_config_base;
  59
  60 #define pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
  61
  62 /* PCI ops */
  63 static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
  64         int where)
  65 {
  66         u32 data;
  67         u32 *cfgaddr;
  68
  69         where &= ~3;
  70         if (cpu_is_xlp9xx()) {
  71                 /* be very careful on SoC buses */
  72                 if (bus->number == 0) {
  73                         /* Scan only existing nodes - uboot bug? */
  74                         if (PCI_SLOT(devfn) != 0 ||
  75                                            !nlm_node_present(PCI_FUNC(devfn)))
  76                                 return 0xffffffff;
  77                 } else if (bus->parent->number == 0) {  /* SoC bus */
  78                         if (PCI_SLOT(devfn) == 0)       /* b.0.0 hangs */
  79                                 return 0xffffffff;
  80                         if (devfn == 44)                /* b.5.4 hangs */
  81                                 return 0xffffffff;
  82                 }
  83         } else if (bus->number == 0 && PCI_SLOT(devfn) == 1 && where == 0x954) {
  84                 return 0xffffffff;
  85         }
  86         cfgaddr = (u32 *)(pci_config_base +
  87                         pci_cfg_addr(bus->number, devfn, where));
  88         data = *cfgaddr;
  89         return data;
  90 }
  91
  92 static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
  93         int where, u32 data)
  94 {
  95         u32 *cfgaddr;
  96
  97         cfgaddr = (u32 *)(pci_config_base +
  98                         pci_cfg_addr(bus->number, devfn, where & ~3));
  99         *cfgaddr = data;
 100 }
 101
 102 static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
 103         int where, int size, u32 *val)
 104 {
 105         u32 data;
 106
 107         if ((size == 2) && (where & 1))
 108                 return PCIBIOS_BAD_REGISTER_NUMBER;
 109         else if ((size == 4) && (where & 3))
 110                 return PCIBIOS_BAD_REGISTER_NUMBER;
 111
 112         data = pci_cfg_read_32bit(bus, devfn, where);
 113
 114         if (size == 1)
 115                 *val = (data >> ((where & 3) << 3)) & 0xff;
 116         else if (size == 2)
 117                 *val = (data >> ((where & 3) << 3)) & 0xffff;
 118         else
 119                 *val = data;
 120
 121         return PCIBIOS_SUCCESSFUL;
 122 }
 123
 124
 125 static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
 126                 int where, int size, u32 val)
 127 {
 128         u32 data;
 129
 130         if ((size == 2) && (where & 1))
 131                 return PCIBIOS_BAD_REGISTER_NUMBER;
 132         else if ((size == 4) && (where & 3))
 133                 return PCIBIOS_BAD_REGISTER_NUMBER;
 134
 135         data = pci_cfg_read_32bit(bus, devfn, where);
 136
 137         if (size == 1)
 138                 data = (data & ~(0xff << ((where & 3) << 3))) |
 139                         (val << ((where & 3) << 3));
 140         else if (size == 2)
 141                 data = (data & ~(0xffff << ((where & 3) << 3))) |
 142                         (val << ((where & 3) << 3));
 143         else
 144                 data = val;
 145
 146         pci_cfg_write_32bit(bus, devfn, where, data);
 147
 148         return PCIBIOS_SUCCESSFUL;
 149 }
 150
 151 struct pci_ops nlm_pci_ops = {
 152         .read  = nlm_pcibios_read,
 153         .write = nlm_pcibios_write
 154 };
 155
 156 static struct resource nlm_pci_mem_resource = {
 157         .name           = "XLP PCI MEM",
 158         .start          = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
 159         .end            = 0xdfffffffUL,
 160         .flags          = IORESOURCE_MEM,
 161 };
 162
 163 static struct resource nlm_pci_io_resource = {
 164         .name           = "XLP IO MEM",
 165         .start          = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
 166         .end            = 0x17ffffffUL,
 167         .flags          = IORESOURCE_IO,
 168 };
 169
 170 struct pci_controller nlm_pci_controller = {
 171         .index          = 0,
 172         .pci_ops        = &nlm_pci_ops,
 173         .mem_resource   = &nlm_pci_mem_resource,
 174         .mem_offset     = 0x00000000UL,
 175         .io_resource    = &nlm_pci_io_resource,
 176         .io_offset      = 0x00000000UL,
 177 };
 178
 179 struct pci_dev *xlp_get_pcie_link(const struct pci_dev *dev)
 180 {
 181         struct pci_bus *bus, *p;
 182
 183         bus = dev->bus;
 184
 185         if (cpu_is_xlp9xx()) {
 186                 /* find bus with grand parent number == 0 */
 187                 for (p = bus->parent; p && p->parent && p->parent->number != 0;
 188                                 p = p->parent)
 189                         bus = p;
 190                 return (p && p->parent) ? bus->self : NULL;
 191         } else {
 192                 /* Find the bridge on bus 0 */
 193                 for (p = bus->parent; p && p->number != 0; p = p->parent)
 194                         bus = p;
 195
 196                 return p ? bus->self : NULL;
 197         }
 198 }
 199
 200 int xlp_socdev_to_node(const struct pci_dev *lnkdev)
 201 {
 202         if (cpu_is_xlp9xx())
 203                 return PCI_FUNC(lnkdev->bus->self->devfn);
 204         else
 205                 return PCI_SLOT(lnkdev->devfn) / 8;
 206 }
 207
 208 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 209 {
 210         struct pci_dev *lnkdev;
 211         int lnkfunc, node;
 212
 213         /*
 214          * For XLP PCIe, there is an IRQ per Link, find out which
 215          * link the device is on to assign interrupts
 216         */
 217         lnkdev = xlp_get_pcie_link(dev);
 218         if (lnkdev == NULL)
 219                 return 0;
 220
 221         lnkfunc = PCI_FUNC(lnkdev->devfn);
 222         node = xlp_socdev_to_node(lnkdev);
 223
 224         return nlm_irq_to_xirq(node, PIC_PCIE_LINK_LEGACY_IRQ(lnkfunc));
 225 }
 226
 227 /* Do platform specific device initialization at pci_enable_device() time */
 228 int pcibios_plat_dev_init(struct pci_dev *dev)
 229 {
 230         return 0;
 231 }
 232
 233 /*
 234  * If big-endian, enable hardware byteswap on the PCIe bridges.
 235  * This will make both the SoC and PCIe devices behave consistently with
 236  * readl/writel.
 237  */
 238 #ifdef __BIG_ENDIAN
 239 static void xlp_config_pci_bswap(int node, int link)
 240 {
 241         uint64_t nbubase, lnkbase;
 242         u32 reg;
 243
 244         nbubase = nlm_get_bridge_regbase(node);
 245         lnkbase = nlm_get_pcie_base(node, link);
 246
 247         /*
 248          *  Enable byte swap in hardware. Program each link's PCIe SWAP regions
 249          * from the link's address ranges.
 250          */
 251         if (cpu_is_xlp9xx()) {
 252                 reg = nlm_read_bridge_reg(nbubase,
 253                                 BRIDGE_9XX_PCIEMEM_BASE0 + link);
 254                 nlm_write_pci_reg(lnkbase, PCIE_9XX_BYTE_SWAP_MEM_BASE, reg);
 255
 256                 reg = nlm_read_bridge_reg(nbubase,
 257                                 BRIDGE_9XX_PCIEMEM_LIMIT0 + link);
 258                 nlm_write_pci_reg(lnkbase,
 259                                 PCIE_9XX_BYTE_SWAP_MEM_LIM, reg | 0xfff);
 260
 261                 reg = nlm_read_bridge_reg(nbubase,
 262                                 BRIDGE_9XX_PCIEIO_BASE0 + link);
 263                 nlm_write_pci_reg(lnkbase, PCIE_9XX_BYTE_SWAP_IO_BASE, reg);
 264
 265                 reg = nlm_read_bridge_reg(nbubase,
 266                                 BRIDGE_9XX_PCIEIO_LIMIT0 + link);
 267                 nlm_write_pci_reg(lnkbase,
 268                                 PCIE_9XX_BYTE_SWAP_IO_LIM, reg | 0xfff);
 269         } else {
 270                 reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEMEM_BASE0 + link);
 271                 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_BASE, reg);
 272
 273                 reg = nlm_read_bridge_reg(nbubase,
 274                                         BRIDGE_PCIEMEM_LIMIT0 + link);
 275                 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_MEM_LIM, reg | 0xfff);
 276
 277                 reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_BASE0 + link);
 278                 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_BASE, reg);
 279
 280                 reg = nlm_read_bridge_reg(nbubase, BRIDGE_PCIEIO_LIMIT0 + link);
 281                 nlm_write_pci_reg(lnkbase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
 282         }
 283 }
 284 #else
 285 /* Swap configuration not needed in little-endian mode */
 286 static inline void xlp_config_pci_bswap(int node, int link) {}
 287 #endif /* __BIG_ENDIAN */
 288
 289 static int __init pcibios_init(void)
 290 {
 291         uint64_t pciebase;
 292         int link, n;
 293         u32 reg;
 294
 295         /* Firmware assigns PCI resources */
 296         pci_set_flags(PCI_PROBE_ONLY);
 297         pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);
 298
 299         /* Extend IO port for memory mapped io */
 300         ioport_resource.start =  0;
 301         ioport_resource.end   = ~0;
 302
 303         for (n = 0; n < NLM_NR_NODES; n++) {
 304                 if (!nlm_node_present(n))
 305                         continue;
 306
 307                 for (link = 0; link < PCIE_NLINKS; link++) {
 308                         pciebase = nlm_get_pcie_base(n, link);
 309                         if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
 310                                 continue;
 311                         xlp_config_pci_bswap(n, link);
 312                         xlp_init_node_msi_irqs(n, link);
 313
 314                         /* put in intpin and irq - u-boot does not */
 315                         reg = nlm_read_pci_reg(pciebase, 0xf);
 316                         reg &= ~0x1ffu;
 317                         reg |= (1 << 8) | PIC_PCIE_LINK_LEGACY_IRQ(link);
 318                         nlm_write_pci_reg(pciebase, 0xf, reg);
 319                         pr_info("XLP PCIe: Link %d-%d initialized.\n", n, link);
 320                 }
 321         }
 322
 323         set_io_port_base(CKSEG1);
 324         nlm_pci_controller.io_map_base = CKSEG1;
 325
 326         register_pci_controller(&nlm_pci_controller);
 327         pr_info("XLP PCIe Controller %pR%pR.\n", &nlm_pci_io_resource,
 328                 &nlm_pci_mem_resource);
 329
 330         return 0;
 331 }
 332 arch_initcall(pcibios_init);