arch/powerpc/platforms/85xx/mpc85xx_cds.c

   1 /*
   2  * MPC85xx setup and early boot code plus other random bits.
   3  *
   4  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
   5  *
   6  * Copyright 2005, 2011-2012 Freescale Semiconductor Inc.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/reboot.h>
  19 #include <linux/pci.h>
  20 #include <linux/kdev_t.h>
  21 #include <linux/major.h>
  22 #include <linux/console.h>
  23 #include <linux/delay.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/initrd.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/fsl_devices.h>
  28 #include <linux/of_platform.h>
  29
  30 #include <asm/pgtable.h>
  31 #include <asm/page.h>
  32 #include <linux/atomic.h>
  33 #include <asm/time.h>
  34 #include <asm/io.h>
  35 #include <asm/machdep.h>
  36 #include <asm/ipic.h>
  37 #include <asm/pci-bridge.h>
  38 #include <asm/irq.h>
  39 #include <mm/mmu_decl.h>
  40 #include <asm/prom.h>
  41 #include <asm/udbg.h>
  42 #include <asm/mpic.h>
  43 #include <asm/i8259.h>
  44
  45 #include <sysdev/fsl_soc.h>
  46 #include <sysdev/fsl_pci.h>
  47
  48 #include "mpc85xx.h"
  49
  50 /*
  51  * The CDS board contains an FPGA/CPLD called "Cadmus", which collects
  52  * various logic and performs system control functions.
  53  * Here is the FPGA/CPLD register map.
  54  */
  55 struct cadmus_reg {
  56         u8 cm_ver;              /* Board version */
  57         u8 cm_csr;              /* General control/status */
  58         u8 cm_rst;              /* Reset control */
  59         u8 cm_hsclk;    /* High speed clock */
  60         u8 cm_hsxclk;   /* High speed clock extended */
  61         u8 cm_led;              /* LED data */
  62         u8 cm_pci;              /* PCI control/status */
  63         u8 cm_dma;              /* DMA control */
  64         u8 res[248];    /* Total 256 bytes */
  65 };
  66
  67 static struct cadmus_reg *cadmus;
  68
  69 #ifdef CONFIG_PCI
  70
  71 #define ARCADIA_HOST_BRIDGE_IDSEL       17
  72 #define ARCADIA_2ND_BRIDGE_IDSEL        3
  73
  74 static int mpc85xx_exclude_device(struct pci_controller *hose,
  75                                   u_char bus, u_char devfn)
  76 {
  77         /* We explicitly do not go past the Tundra 320 Bridge */
  78         if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
  79                 return PCIBIOS_DEVICE_NOT_FOUND;
  80         if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
  81                 return PCIBIOS_DEVICE_NOT_FOUND;
  82         else
  83                 return PCIBIOS_SUCCESSFUL;
  84 }
  85
  86 static void mpc85xx_cds_restart(char *cmd)
  87 {
  88         struct pci_dev *dev;
  89         u_char tmp;
  90
  91         if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
  92                                         NULL))) {
  93
  94                 /* Use the VIA Super Southbridge to force a PCI reset */
  95                 pci_read_config_byte(dev, 0x47, &tmp);
  96                 pci_write_config_byte(dev, 0x47, tmp | 1);
  97
  98                 /* Flush the outbound PCI write queues */
  99                 pci_read_config_byte(dev, 0x47, &tmp);
 100
 101                 /*
 102                  *  At this point, the harware reset should have triggered.
 103                  *  However, if it doesn't work for some mysterious reason,
 104                  *  just fall through to the default reset below.
 105                  */
 106
 107                 pci_dev_put(dev);
 108         }
 109
 110         /*
 111          *  If we can't find the VIA chip (maybe the P2P bridge is disabled)
 112          *  or the VIA chip reset didn't work, just use the default reset.
 113          */
 114         fsl_rstcr_restart(NULL);
 115 }
 116
 117 static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
 118 {
 119         u_char c;
 120         if (dev->vendor == PCI_VENDOR_ID_VIA) {
 121                 switch (dev->device) {
 122                 case PCI_DEVICE_ID_VIA_82C586_1:
 123                         /*
 124                          * U-Boot does not set the enable bits
 125                          * for the IDE device. Force them on here.
 126                          */
 127                         pci_read_config_byte(dev, 0x40, &c);
 128                         c |= 0x03; /* IDE: Chip Enable Bits */
 129                         pci_write_config_byte(dev, 0x40, c);
 130
 131                         /*
 132                          * Since only primary interface works, force the
 133                          * IDE function to standard primary IDE interrupt
 134                          * w/ 8259 offset
 135                          */
 136                         dev->irq = 14;
 137                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 138                         break;
 139                 /*
 140                  * Force legacy USB interrupt routing
 141                  */
 142                 case PCI_DEVICE_ID_VIA_82C586_2:
 143                 /* There are two USB controllers.
 144                  * Identify them by functon number
 145                  */
 146                         if (PCI_FUNC(dev->devfn) == 3)
 147                                 dev->irq = 11;
 148                         else
 149                                 dev->irq = 10;
 150                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 151                 default:
 152                         break;
 153                 }
 154         }
 155 }
 156
 157 static void skip_fake_bridge(struct pci_dev *dev)
 158 {
 159         /* Make it an error to skip the fake bridge
 160          * in pci_setup_device() in probe.c */
 161         dev->hdr_type = 0x7f;
 162 }
 163 DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
 164 DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
 165 DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);
 166
 167 #define PCI_DEVICE_ID_IDT_TSI310        0x01a7
 168
 169 /*
 170  * Fix Tsi310 PCI-X bridge resource.
 171  * Force the bridge to open a window from 0x0000-0x1fff in PCI I/O space.
 172  * This allows legacy I/O(i8259, etc) on the VIA southbridge to be accessed.
 173  */
 174 void mpc85xx_cds_fixup_bus(struct pci_bus *bus)
 175 {
 176         struct pci_dev *dev = bus->self;
 177         struct resource *res = bus->resource[0];
 178
 179         if (dev != NULL &&
 180             dev->vendor == PCI_VENDOR_ID_IBM &&
 181             dev->device == PCI_DEVICE_ID_IDT_TSI310) {
 182                 if (res) {
 183                         res->start = 0;
 184                         res->end   = 0x1fff;
 185                         res->flags = IORESOURCE_IO;
 186                         pr_info("mpc85xx_cds: PCI bridge resource fixup applied\n");
 187                         pr_info("mpc85xx_cds: %pR\n", res);
 188                 }
 189         }
 190
 191         fsl_pcibios_fixup_bus(bus);
 192 }
 193
 194 #ifdef CONFIG_PPC_I8259
 195 static void mpc85xx_8259_cascade_handler(unsigned int irq,
 196                                          struct irq_desc *desc)
 197 {
 198         unsigned int cascade_irq = i8259_irq();
 199
 200         if (cascade_irq != NO_IRQ)
 201                 /* handle an interrupt from the 8259 */
 202                 generic_handle_irq(cascade_irq);
 203
 204         /* check for any interrupts from the shared IRQ line */
 205         handle_fasteoi_irq(irq, desc);
 206 }
 207
 208 static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
 209 {
 210         return IRQ_HANDLED;
 211 }
 212
 213 static struct irqaction mpc85xxcds_8259_irqaction = {
 214         .handler = mpc85xx_8259_cascade_action,
 215         .flags = IRQF_SHARED | IRQF_NO_THREAD,
 216         .name = "8259 cascade",
 217 };
 218 #endif /* PPC_I8259 */
 219 #endif /* CONFIG_PCI */
 220
 221 static void __init mpc85xx_cds_pic_init(void)
 222 {
 223         struct mpic *mpic;
 224         mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
 225                         0, 256, " OpenPIC  ");
 226         BUG_ON(mpic == NULL);
 227         mpic_init(mpic);
 228 }
 229
 230 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
 231 static int mpc85xx_cds_8259_attach(void)
 232 {
 233         int ret;
 234         struct device_node *np = NULL;
 235         struct device_node *cascade_node = NULL;
 236         int cascade_irq;
 237
 238         /* Initialize the i8259 controller */
 239         for_each_node_by_type(np, "interrupt-controller")
 240                 if (of_device_is_compatible(np, "chrp,iic")) {
 241                         cascade_node = np;
 242                         break;
 243                 }
 244
 245         if (cascade_node == NULL) {
 246                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
 247                 return -ENODEV;
 248         }
 249
 250         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
 251         if (cascade_irq == NO_IRQ) {
 252                 printk(KERN_ERR "Failed to map cascade interrupt\n");
 253                 return -ENXIO;
 254         }
 255
 256         i8259_init(cascade_node, 0);
 257         of_node_put(cascade_node);
 258
 259         /*
 260          *  Hook the interrupt to make sure desc->action is never NULL.
 261          *  This is required to ensure that the interrupt does not get
 262          *  disabled when the last user of the shared IRQ line frees their
 263          *  interrupt.
 264          */
 265         if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
 266                 printk(KERN_ERR "Failed to setup cascade interrupt\n");
 267                 return ret;
 268         }
 269
 270         /* Success. Connect our low-level cascade handler. */
 271         irq_set_handler(cascade_irq, mpc85xx_8259_cascade_handler);
 272
 273         return 0;
 274 }
 275 machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);
 276
 277 #endif /* CONFIG_PPC_I8259 */
 278
 279 static void mpc85xx_cds_pci_assign_primary(void)
 280 {
 281 #ifdef CONFIG_PCI
 282         struct device_node *np;
 283
 284         if (fsl_pci_primary)
 285                 return;
 286
 287         /*
 288          * MPC85xx_CDS has ISA bridge but unfortunately there is no
 289          * isa node in device tree. We now looking for i8259 node as
 290          * a workaround for such a broken device tree. This routine
 291          * is for complying to all device trees.
 292          */
 293         np = of_find_node_by_name(NULL, "i8259");
 294         while ((fsl_pci_primary = of_get_parent(np))) {
 295                 of_node_put(np);
 296                 np = fsl_pci_primary;
 297
 298                 if ((of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 299                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) &&
 300                     of_device_is_available(np))
 301                         return;
 302         }
 303 #endif
 304 }
 305
 306 /*
 307  * Setup the architecture
 308  */
 309 static void __init mpc85xx_cds_setup_arch(void)
 310 {
 311         struct device_node *np;
 312         int cds_pci_slot;
 313
 314         if (ppc_md.progress)
 315                 ppc_md.progress("mpc85xx_cds_setup_arch()", 0);
 316
 317         np = of_find_compatible_node(NULL, NULL, "fsl,mpc8548cds-fpga");
 318         if (!np) {
 319                 pr_err("Could not find FPGA node.\n");
 320                 return;
 321         }
 322
 323         cadmus = of_iomap(np, 0);
 324         of_node_put(np);
 325         if (!cadmus) {
 326                 pr_err("Fail to map FPGA area.\n");
 327                 return;
 328         }
 329
 330         if (ppc_md.progress) {
 331                 char buf[40];
 332                 cds_pci_slot = ((in_8(&cadmus->cm_csr) >> 6) & 0x3) + 1;
 333                 snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
 334                                 in_8(&cadmus->cm_ver), cds_pci_slot);
 335                 ppc_md.progress(buf, 0);
 336         }
 337
 338 #ifdef CONFIG_PCI
 339         ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
 340         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 341 #endif
 342
 343         mpc85xx_cds_pci_assign_primary();
 344         fsl_pci_assign_primary();
 345 }
 346
 347 static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
 348 {
 349         uint pvid, svid, phid1;
 350
 351         pvid = mfspr(SPRN_PVR);
 352         svid = mfspr(SPRN_SVR);
 353
 354         seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
 355         seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n",
 356                         in_8(&cadmus->cm_ver));
 357         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 358         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 359
 360         /* Display cpu Pll setting */
 361         phid1 = mfspr(SPRN_HID1);
 362         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 363 }
 364
 365
 366 /*
 367  * Called very early, device-tree isn't unflattened
 368  */
 369 static int __init mpc85xx_cds_probe(void)
 370 {
 371         unsigned long root = of_get_flat_dt_root();
 372
 373         return of_flat_dt_is_compatible(root, "MPC85xxCDS");
 374 }
 375
 376 machine_arch_initcall(mpc85xx_cds, mpc85xx_common_publish_devices);
 377
 378 define_machine(mpc85xx_cds) {
 379         .name           = "MPC85xx CDS",
 380         .probe          = mpc85xx_cds_probe,
 381         .setup_arch     = mpc85xx_cds_setup_arch,
 382         .init_IRQ       = mpc85xx_cds_pic_init,
 383         .show_cpuinfo   = mpc85xx_cds_show_cpuinfo,
 384         .get_irq        = mpic_get_irq,
 385 #ifdef CONFIG_PCI
 386         .restart        = mpc85xx_cds_restart,
 387         .pcibios_fixup_bus      = mpc85xx_cds_fixup_bus,
 388 #else
 389         .restart        = fsl_rstcr_restart,
 390 #endif
 391         .calibrate_decr = generic_calibrate_decr,
 392         .progress       = udbg_progress,
 393 };