drivers/bcma/driver_mips.c

   1 /*
   2  * Broadcom specific AMBA
   3  * Broadcom MIPS32 74K core driver
   4  *
   5  * Copyright 2009, Broadcom Corporation
   6  * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
   7  * Copyright 2010, Bernhard Loos <bernhardloos@googlemail.com>
   8  * Copyright 2011, Hauke Mehrtens <hauke@hauke-m.de>
   9  *
  10  * Licensed under the GNU/GPL. See COPYING for details.
  11  */
  12
  13 #include "bcma_private.h"
  14
  15 #include <linux/bcma/bcma.h>
  16
  17 #include <linux/serial.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/serial_reg.h>
  20 #include <linux/time.h>
  21 #ifdef CONFIG_BCM47XX
  22 #include <linux/bcm47xx_nvram.h>
  23 #endif
  24
  25 enum bcma_boot_dev {
  26         BCMA_BOOT_DEV_UNK = 0,
  27         BCMA_BOOT_DEV_ROM,
  28         BCMA_BOOT_DEV_PARALLEL,
  29         BCMA_BOOT_DEV_SERIAL,
  30         BCMA_BOOT_DEV_NAND,
  31 };
  32
  33 /* The 47162a0 hangs when reading MIPS DMP registers registers */
  34 static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
  35 {
  36         return dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM47162 &&
  37                dev->bus->chipinfo.rev == 0 && dev->id.id == BCMA_CORE_MIPS_74K;
  38 }
  39
  40 /* The 5357b0 hangs when reading USB20H DMP registers */
  41 static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
  42 {
  43         return (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM5357 ||
  44                 dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4749) &&
  45                dev->bus->chipinfo.pkg == 11 &&
  46                dev->id.id == BCMA_CORE_USB20_HOST;
  47 }
  48
  49 static inline u32 mips_read32(struct bcma_drv_mips *mcore,
  50                               u16 offset)
  51 {
  52         return bcma_read32(mcore->core, offset);
  53 }
  54
  55 static inline void mips_write32(struct bcma_drv_mips *mcore,
  56                                 u16 offset,
  57                                 u32 value)
  58 {
  59         bcma_write32(mcore->core, offset, value);
  60 }
  61
  62 static const u32 ipsflag_irq_mask[] = {
  63         0,
  64         BCMA_MIPS_IPSFLAG_IRQ1,
  65         BCMA_MIPS_IPSFLAG_IRQ2,
  66         BCMA_MIPS_IPSFLAG_IRQ3,
  67         BCMA_MIPS_IPSFLAG_IRQ4,
  68 };
  69
  70 static const u32 ipsflag_irq_shift[] = {
  71         0,
  72         BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
  73         BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
  74         BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
  75         BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
  76 };
  77
  78 static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
  79 {
  80         u32 flag;
  81
  82         if (bcma_core_mips_bcm47162a0_quirk(dev))
  83                 return dev->core_index;
  84         if (bcma_core_mips_bcm5357b0_quirk(dev))
  85                 return dev->core_index;
  86         flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
  87
  88         if (flag)
  89                 return flag & 0x1F;
  90         else
  91                 return 0x3f;
  92 }
  93
  94 /* Get the MIPS IRQ assignment for a specified device.
  95  * If unassigned, 0 is returned.
  96  * If disabled, 5 is returned.
  97  * If not supported, 6 is returned.
  98  */
  99 unsigned int bcma_core_mips_irq(struct bcma_device *dev)
 100 {
 101         struct bcma_device *mdev = dev->bus->drv_mips.core;
 102         u32 irqflag;
 103         unsigned int irq;
 104
 105         irqflag = bcma_core_mips_irqflag(dev);
 106         if (irqflag == 0x3f)
 107                 return 6;
 108
 109         for (irq = 0; irq <= 4; irq++)
 110                 if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
 111                     (1 << irqflag))
 112                         return irq;
 113
 114         return 5;
 115 }
 116
 117 static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
 118 {
 119         unsigned int oldirq = bcma_core_mips_irq(dev);
 120         struct bcma_bus *bus = dev->bus;
 121         struct bcma_device *mdev = bus->drv_mips.core;
 122         u32 irqflag;
 123
 124         irqflag = bcma_core_mips_irqflag(dev);
 125         BUG_ON(oldirq == 6);
 126
 127         dev->irq = irq + 2;
 128
 129         /* clear the old irq */
 130         if (oldirq == 0)
 131                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 132                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
 133                             ~(1 << irqflag));
 134         else if (oldirq != 5)
 135                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(oldirq), 0);
 136
 137         /* assign the new one */
 138         if (irq == 0) {
 139                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 140                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
 141                             (1 << irqflag));
 142         } else {
 143                 u32 irqinitmask = bcma_read32(mdev,
 144                                               BCMA_MIPS_MIPS74K_INTMASK(irq));
 145                 if (irqinitmask) {
 146                         struct bcma_device *core;
 147
 148                         /* backplane irq line is in use, find out who uses
 149                          * it and set user to irq 0
 150                          */
 151                         list_for_each_entry(core, &bus->cores, list) {
 152                                 if ((1 << bcma_core_mips_irqflag(core)) ==
 153                                     irqinitmask) {
 154                                         bcma_core_mips_set_irq(core, 0);
 155                                         break;
 156                                 }
 157                         }
 158                 }
 159                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
 160                              1 << irqflag);
 161         }
 162
 163         bcma_debug(bus, "set_irq: core 0x%04x, irq %d => %d\n",
 164                    dev->id.id, oldirq <= 4 ? oldirq + 2 : 0, irq + 2);
 165 }
 166
 167 static void bcma_core_mips_set_irq_name(struct bcma_bus *bus, unsigned int irq,
 168                                         u16 coreid, u8 unit)
 169 {
 170         struct bcma_device *core;
 171
 172         core = bcma_find_core_unit(bus, coreid, unit);
 173         if (!core) {
 174                 bcma_warn(bus,
 175                           "Can not find core (id: 0x%x, unit %i) for IRQ configuration.\n",
 176                           coreid, unit);
 177                 return;
 178         }
 179
 180         bcma_core_mips_set_irq(core, irq);
 181 }
 182
 183 static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
 184 {
 185         int i;
 186         static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
 187         char interrupts[20];
 188         char *ints = interrupts;
 189
 190         for (i = 0; i < ARRAY_SIZE(irq_name); i++)
 191                 ints += sprintf(ints, " %s%c",
 192                                 irq_name[i], i == irq ? '*' : ' ');
 193
 194         bcma_debug(dev->bus, "core 0x%04x, irq:%s\n", dev->id.id, interrupts);
 195 }
 196
 197 static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
 198 {
 199         struct bcma_device *core;
 200
 201         list_for_each_entry(core, &bus->cores, list) {
 202                 bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
 203         }
 204 }
 205
 206 u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
 207 {
 208         struct bcma_bus *bus = mcore->core->bus;
 209
 210         if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
 211                 return bcma_pmu_get_cpu_clock(&bus->drv_cc);
 212
 213         bcma_err(bus, "No PMU available, need this to get the cpu clock\n");
 214         return 0;
 215 }
 216 EXPORT_SYMBOL(bcma_cpu_clock);
 217
 218 static enum bcma_boot_dev bcma_boot_dev(struct bcma_bus *bus)
 219 {
 220         struct bcma_drv_cc *cc = &bus->drv_cc;
 221         u8 cc_rev = cc->core->id.rev;
 222
 223         if (cc_rev == 42) {
 224                 struct bcma_device *core;
 225
 226                 core = bcma_find_core(bus, BCMA_CORE_NS_ROM);
 227                 if (core) {
 228                         switch (bcma_aread32(core, BCMA_IOST) &
 229                                 BCMA_NS_ROM_IOST_BOOT_DEV_MASK) {
 230                         case BCMA_NS_ROM_IOST_BOOT_DEV_NOR:
 231                                 return BCMA_BOOT_DEV_SERIAL;
 232                         case BCMA_NS_ROM_IOST_BOOT_DEV_NAND:
 233                                 return BCMA_BOOT_DEV_NAND;
 234                         case BCMA_NS_ROM_IOST_BOOT_DEV_ROM:
 235                         default:
 236                                 return BCMA_BOOT_DEV_ROM;
 237                         }
 238                 }
 239         } else {
 240                 if (cc_rev == 38) {
 241                         if (cc->status & BCMA_CC_CHIPST_5357_NAND_BOOT)
 242                                 return BCMA_BOOT_DEV_NAND;
 243                         else if (cc->status & BIT(5))
 244                                 return BCMA_BOOT_DEV_ROM;
 245                 }
 246
 247                 if ((cc->capabilities & BCMA_CC_CAP_FLASHT) ==
 248                     BCMA_CC_FLASHT_PARA)
 249                         return BCMA_BOOT_DEV_PARALLEL;
 250                 else
 251                         return BCMA_BOOT_DEV_SERIAL;
 252         }
 253
 254         return BCMA_BOOT_DEV_SERIAL;
 255 }
 256
 257 static void bcma_core_mips_nvram_init(struct bcma_drv_mips *mcore)
 258 {
 259         struct bcma_bus *bus = mcore->core->bus;
 260         enum bcma_boot_dev boot_dev;
 261
 262         /* Determine flash type this SoC boots from */
 263         boot_dev = bcma_boot_dev(bus);
 264         switch (boot_dev) {
 265         case BCMA_BOOT_DEV_PARALLEL:
 266         case BCMA_BOOT_DEV_SERIAL:
 267 #ifdef CONFIG_BCM47XX
 268                 bcm47xx_nvram_init_from_mem(BCMA_SOC_FLASH2,
 269                                             BCMA_SOC_FLASH2_SZ);
 270 #endif
 271                 break;
 272         case BCMA_BOOT_DEV_NAND:
 273 #ifdef CONFIG_BCM47XX
 274                 bcm47xx_nvram_init_from_mem(BCMA_SOC_FLASH1,
 275                                             BCMA_SOC_FLASH1_SZ);
 276 #endif
 277                 break;
 278         default:
 279                 break;
 280         }
 281 }
 282
 283 void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)
 284 {
 285         struct bcma_bus *bus = mcore->core->bus;
 286
 287         if (mcore->early_setup_done)
 288                 return;
 289
 290         bcma_chipco_serial_init(&bus->drv_cc);
 291         bcma_core_mips_nvram_init(mcore);
 292
 293         mcore->early_setup_done = true;
 294 }
 295
 296 static void bcma_fix_i2s_irqflag(struct bcma_bus *bus)
 297 {
 298         struct bcma_device *cpu, *pcie, *i2s;
 299
 300         /* Fixup the interrupts in 4716/4748 for i2s core (2010 Broadcom SDK)
 301          * (IRQ flags > 7 are ignored when setting the interrupt masks)
 302          */
 303         if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4716 &&
 304             bus->chipinfo.id != BCMA_CHIP_ID_BCM4748)
 305                 return;
 306
 307         cpu = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 308         pcie = bcma_find_core(bus, BCMA_CORE_PCIE);
 309         i2s = bcma_find_core(bus, BCMA_CORE_I2S);
 310         if (cpu && pcie && i2s &&
 311             bcma_aread32(cpu, BCMA_MIPS_OOBSELINA74) == 0x08060504 &&
 312             bcma_aread32(pcie, BCMA_MIPS_OOBSELINA74) == 0x08060504 &&
 313             bcma_aread32(i2s, BCMA_MIPS_OOBSELOUTA30) == 0x88) {
 314                 bcma_awrite32(cpu, BCMA_MIPS_OOBSELINA74, 0x07060504);
 315                 bcma_awrite32(pcie, BCMA_MIPS_OOBSELINA74, 0x07060504);
 316                 bcma_awrite32(i2s, BCMA_MIPS_OOBSELOUTA30, 0x87);
 317                 bcma_debug(bus,
 318                            "Moved i2s interrupt to oob line 7 instead of 8\n");
 319         }
 320 }
 321
 322 void bcma_core_mips_init(struct bcma_drv_mips *mcore)
 323 {
 324         struct bcma_bus *bus;
 325         struct bcma_device *core;
 326         bus = mcore->core->bus;
 327
 328         if (mcore->setup_done)
 329                 return;
 330
 331         bcma_debug(bus, "Initializing MIPS core...\n");
 332
 333         bcma_core_mips_early_init(mcore);
 334
 335         bcma_fix_i2s_irqflag(bus);
 336
 337         switch (bus->chipinfo.id) {
 338         case BCMA_CHIP_ID_BCM4716:
 339         case BCMA_CHIP_ID_BCM4748:
 340                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
 341                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
 342                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
 343                 bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_PCIE, 0);
 344                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
 345                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
 346                 break;
 347         case BCMA_CHIP_ID_BCM5356:
 348         case BCMA_CHIP_ID_BCM47162:
 349         case BCMA_CHIP_ID_BCM53572:
 350                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
 351                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
 352                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
 353                 break;
 354         case BCMA_CHIP_ID_BCM5357:
 355         case BCMA_CHIP_ID_BCM4749:
 356                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
 357                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
 358                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
 359                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
 360                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
 361                 break;
 362         case BCMA_CHIP_ID_BCM4706:
 363                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_PCIE, 0);
 364                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_4706_MAC_GBIT,
 365                                             0);
 366                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_PCIE, 1);
 367                 bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_USB20_HOST, 0);
 368                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_4706_CHIPCOMMON,
 369                                             0);
 370                 break;
 371         default:
 372                 list_for_each_entry(core, &bus->cores, list) {
 373                         core->irq = bcma_core_irq(core, 0);
 374                 }
 375                 bcma_err(bus,
 376                          "Unknown device (0x%x) found, can not configure IRQs\n",
 377                          bus->chipinfo.id);
 378         }
 379         bcma_debug(bus, "IRQ reconfiguration done\n");
 380         bcma_core_mips_dump_irq(bus);
 381
 382         mcore->setup_done = true;
 383 }