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 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/module.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/fsl_devices.h>
  29 #include <linux/of_platform.h>
  30
  31 #include <asm/system.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/page.h>
  34 #include <linux/atomic.h>
  35 #include <asm/time.h>
  36 #include <asm/io.h>
  37 #include <asm/machdep.h>
  38 #include <asm/ipic.h>
  39 #include <asm/pci-bridge.h>
  40 #include <asm/irq.h>
  41 #include <mm/mmu_decl.h>
  42 #include <asm/prom.h>
  43 #include <asm/udbg.h>
  44 #include <asm/mpic.h>
  45 #include <asm/i8259.h>
  46
  47 #include <sysdev/fsl_soc.h>
  48 #include <sysdev/fsl_pci.h>
  49
  50 /* CADMUS info */
  51 /* xxx - galak, move into device tree */
  52 #define CADMUS_BASE (0xf8004000)
  53 #define CADMUS_SIZE (256)
  54 #define CM_VER  (0)
  55 #define CM_CSR  (1)
  56 #define CM_RST  (2)
  57
  58
  59 static int cds_pci_slot = 2;
  60 static volatile u8 *cadmus;
  61
  62 #ifdef CONFIG_PCI
  63
  64 #define ARCADIA_HOST_BRIDGE_IDSEL       17
  65 #define ARCADIA_2ND_BRIDGE_IDSEL        3
  66
  67 static int mpc85xx_exclude_device(struct pci_controller *hose,
  68                                   u_char bus, u_char devfn)
  69 {
  70         /* We explicitly do not go past the Tundra 320 Bridge */
  71         if ((bus == 1) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
  72                 return PCIBIOS_DEVICE_NOT_FOUND;
  73         if ((bus == 0) && (PCI_SLOT(devfn) == ARCADIA_2ND_BRIDGE_IDSEL))
  74                 return PCIBIOS_DEVICE_NOT_FOUND;
  75         else
  76                 return PCIBIOS_SUCCESSFUL;
  77 }
  78
  79 static void mpc85xx_cds_restart(char *cmd)
  80 {
  81         struct pci_dev *dev;
  82         u_char tmp;
  83
  84         if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
  85                                         NULL))) {
  86
  87                 /* Use the VIA Super Southbridge to force a PCI reset */
  88                 pci_read_config_byte(dev, 0x47, &tmp);
  89                 pci_write_config_byte(dev, 0x47, tmp | 1);
  90
  91                 /* Flush the outbound PCI write queues */
  92                 pci_read_config_byte(dev, 0x47, &tmp);
  93
  94                 /*
  95                  *  At this point, the harware reset should have triggered.
  96                  *  However, if it doesn't work for some mysterious reason,
  97                  *  just fall through to the default reset below.
  98                  */
  99
 100                 pci_dev_put(dev);
 101         }
 102
 103         /*
 104          *  If we can't find the VIA chip (maybe the P2P bridge is disabled)
 105          *  or the VIA chip reset didn't work, just use the default reset.
 106          */
 107         fsl_rstcr_restart(NULL);
 108 }
 109
 110 static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev)
 111 {
 112         u_char c;
 113         if (dev->vendor == PCI_VENDOR_ID_VIA) {
 114                 switch (dev->device) {
 115                 case PCI_DEVICE_ID_VIA_82C586_1:
 116                         /*
 117                          * U-Boot does not set the enable bits
 118                          * for the IDE device. Force them on here.
 119                          */
 120                         pci_read_config_byte(dev, 0x40, &c);
 121                         c |= 0x03; /* IDE: Chip Enable Bits */
 122                         pci_write_config_byte(dev, 0x40, c);
 123
 124                         /*
 125                          * Since only primary interface works, force the
 126                          * IDE function to standard primary IDE interrupt
 127                          * w/ 8259 offset
 128                          */
 129                         dev->irq = 14;
 130                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 131                         break;
 132                 /*
 133                  * Force legacy USB interrupt routing
 134                  */
 135                 case PCI_DEVICE_ID_VIA_82C586_2:
 136                 /* There are two USB controllers.
 137                  * Identify them by functon number
 138                  */
 139                         if (PCI_FUNC(dev->devfn) == 3)
 140                                 dev->irq = 11;
 141                         else
 142                                 dev->irq = 10;
 143                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
 144                 default:
 145                         break;
 146                 }
 147         }
 148 }
 149
 150 static void __devinit skip_fake_bridge(struct pci_dev *dev)
 151 {
 152         /* Make it an error to skip the fake bridge
 153          * in pci_setup_device() in probe.c */
 154         dev->hdr_type = 0x7f;
 155 }
 156 DECLARE_PCI_FIXUP_EARLY(0x1957, 0x3fff, skip_fake_bridge);
 157 DECLARE_PCI_FIXUP_EARLY(0x3fff, 0x1957, skip_fake_bridge);
 158 DECLARE_PCI_FIXUP_EARLY(0xff3f, 0x5719, skip_fake_bridge);
 159
 160 #ifdef CONFIG_PPC_I8259
 161 static void mpc85xx_8259_cascade_handler(unsigned int irq,
 162                                          struct irq_desc *desc)
 163 {
 164         unsigned int cascade_irq = i8259_irq();
 165
 166         if (cascade_irq != NO_IRQ)
 167                 /* handle an interrupt from the 8259 */
 168                 generic_handle_irq(cascade_irq);
 169
 170         /* check for any interrupts from the shared IRQ line */
 171         handle_fasteoi_irq(irq, desc);
 172 }
 173
 174 static irqreturn_t mpc85xx_8259_cascade_action(int irq, void *dev_id)
 175 {
 176         return IRQ_HANDLED;
 177 }
 178
 179 static struct irqaction mpc85xxcds_8259_irqaction = {
 180         .handler = mpc85xx_8259_cascade_action,
 181         .flags = IRQF_SHARED,
 182         .name = "8259 cascade",
 183 };
 184 #endif /* PPC_I8259 */
 185 #endif /* CONFIG_PCI */
 186
 187 static void __init mpc85xx_cds_pic_init(void)
 188 {
 189         struct mpic *mpic;
 190         struct resource r;
 191         struct device_node *np = NULL;
 192
 193         np = of_find_node_by_type(np, "open-pic");
 194
 195         if (np == NULL) {
 196                 printk(KERN_ERR "Could not find open-pic node\n");
 197                 return;
 198         }
 199
 200         if (of_address_to_resource(np, 0, &r)) {
 201                 printk(KERN_ERR "Failed to map mpic register space\n");
 202                 of_node_put(np);
 203                 return;
 204         }
 205
 206         mpic = mpic_alloc(np, r.start,
 207                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
 208                         0, 256, " OpenPIC  ");
 209         BUG_ON(mpic == NULL);
 210
 211         /* Return the mpic node */
 212         of_node_put(np);
 213
 214         mpic_init(mpic);
 215 }
 216
 217 #if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
 218 static int mpc85xx_cds_8259_attach(void)
 219 {
 220         int ret;
 221         struct device_node *np = NULL;
 222         struct device_node *cascade_node = NULL;
 223         int cascade_irq;
 224
 225         /* Initialize the i8259 controller */
 226         for_each_node_by_type(np, "interrupt-controller")
 227                 if (of_device_is_compatible(np, "chrp,iic")) {
 228                         cascade_node = np;
 229                         break;
 230                 }
 231
 232         if (cascade_node == NULL) {
 233                 printk(KERN_DEBUG "Could not find i8259 PIC\n");
 234                 return -ENODEV;
 235         }
 236
 237         cascade_irq = irq_of_parse_and_map(cascade_node, 0);
 238         if (cascade_irq == NO_IRQ) {
 239                 printk(KERN_ERR "Failed to map cascade interrupt\n");
 240                 return -ENXIO;
 241         }
 242
 243         i8259_init(cascade_node, 0);
 244         of_node_put(cascade_node);
 245
 246         /*
 247          *  Hook the interrupt to make sure desc->action is never NULL.
 248          *  This is required to ensure that the interrupt does not get
 249          *  disabled when the last user of the shared IRQ line frees their
 250          *  interrupt.
 251          */
 252         if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
 253                 printk(KERN_ERR "Failed to setup cascade interrupt\n");
 254                 return ret;
 255         }
 256
 257         /* Success. Connect our low-level cascade handler. */
 258         irq_set_handler(cascade_irq, mpc85xx_8259_cascade_handler);
 259
 260         return 0;
 261 }
 262 machine_device_initcall(mpc85xx_cds, mpc85xx_cds_8259_attach);
 263
 264 #endif /* CONFIG_PPC_I8259 */
 265
 266 /*
 267  * Setup the architecture
 268  */
 269 static void __init mpc85xx_cds_setup_arch(void)
 270 {
 271 #ifdef CONFIG_PCI
 272         struct device_node *np;
 273 #endif
 274
 275         if (ppc_md.progress)
 276                 ppc_md.progress("mpc85xx_cds_setup_arch()", 0);
 277
 278         cadmus = ioremap(CADMUS_BASE, CADMUS_SIZE);
 279         cds_pci_slot = ((cadmus[CM_CSR] >> 6) & 0x3) + 1;
 280
 281         if (ppc_md.progress) {
 282                 char buf[40];
 283                 snprintf(buf, 40, "CDS Version = 0x%x in slot %d\n",
 284                                 cadmus[CM_VER], cds_pci_slot);
 285                 ppc_md.progress(buf, 0);
 286         }
 287
 288 #ifdef CONFIG_PCI
 289         for_each_node_by_type(np, "pci") {
 290                 if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
 291                     of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
 292                         struct resource rsrc;
 293                         of_address_to_resource(np, 0, &rsrc);
 294                         if ((rsrc.start & 0xfffff) == 0x8000)
 295                                 fsl_add_bridge(np, 1);
 296                         else
 297                                 fsl_add_bridge(np, 0);
 298                 }
 299         }
 300
 301         ppc_md.pci_irq_fixup = mpc85xx_cds_pci_irq_fixup;
 302         ppc_md.pci_exclude_device = mpc85xx_exclude_device;
 303 #endif
 304 }
 305
 306 static void mpc85xx_cds_show_cpuinfo(struct seq_file *m)
 307 {
 308         uint pvid, svid, phid1;
 309
 310         pvid = mfspr(SPRN_PVR);
 311         svid = mfspr(SPRN_SVR);
 312
 313         seq_printf(m, "Vendor\t\t: Freescale Semiconductor\n");
 314         seq_printf(m, "Machine\t\t: MPC85xx CDS (0x%x)\n", cadmus[CM_VER]);
 315         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 316         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 317
 318         /* Display cpu Pll setting */
 319         phid1 = mfspr(SPRN_HID1);
 320         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 321 }
 322
 323
 324 /*
 325  * Called very early, device-tree isn't unflattened
 326  */
 327 static int __init mpc85xx_cds_probe(void)
 328 {
 329         unsigned long root = of_get_flat_dt_root();
 330
 331         return of_flat_dt_is_compatible(root, "MPC85xxCDS");
 332 }
 333
 334 static struct of_device_id __initdata of_bus_ids[] = {
 335         { .type = "soc", },
 336         { .compatible = "soc", },
 337         { .compatible = "simple-bus", },
 338         { .compatible = "gianfar", },
 339         {},
 340 };
 341
 342 static int __init declare_of_platform_devices(void)
 343 {
 344         return of_platform_bus_probe(NULL, of_bus_ids, NULL);
 345 }
 346 machine_device_initcall(mpc85xx_cds, declare_of_platform_devices);
 347
 348 define_machine(mpc85xx_cds) {
 349         .name           = "MPC85xx CDS",
 350         .probe          = mpc85xx_cds_probe,
 351         .setup_arch     = mpc85xx_cds_setup_arch,
 352         .init_IRQ       = mpc85xx_cds_pic_init,
 353         .show_cpuinfo   = mpc85xx_cds_show_cpuinfo,
 354         .get_irq        = mpic_get_irq,
 355 #ifdef CONFIG_PCI
 356         .restart        = mpc85xx_cds_restart,
 357         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 358 #else
 359         .restart        = fsl_rstcr_restart,
 360 #endif
 361         .calibrate_decr = generic_calibrate_decr,
 362         .progress       = udbg_progress,
 363 };