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/mtd/physmap.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/serial.h>
  20 #include <linux/serial_core.h>
  21 #include <linux/serial_reg.h>
  22 #include <linux/time.h>
  23
  24 static const char * const part_probes[] = { "bcm47xxpart", NULL };
  25
  26 static struct physmap_flash_data bcma_pflash_data = {
  27         .part_probe_types       = part_probes,
  28 };
  29
  30 static struct resource bcma_pflash_resource = {
  31         .name   = "bcma_pflash",
  32         .flags  = IORESOURCE_MEM,
  33 };
  34
  35 struct platform_device bcma_pflash_dev = {
  36         .name           = "physmap-flash",
  37         .dev            = {
  38                 .platform_data  = &bcma_pflash_data,
  39         },
  40         .resource       = &bcma_pflash_resource,
  41         .num_resources  = 1,
  42 };
  43
  44 /* The 47162a0 hangs when reading MIPS DMP registers registers */
  45 static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
  46 {
  47         return dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM47162 &&
  48                dev->bus->chipinfo.rev == 0 && dev->id.id == BCMA_CORE_MIPS_74K;
  49 }
  50
  51 /* The 5357b0 hangs when reading USB20H DMP registers */
  52 static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
  53 {
  54         return (dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM5357 ||
  55                 dev->bus->chipinfo.id == BCMA_CHIP_ID_BCM4749) &&
  56                dev->bus->chipinfo.pkg == 11 &&
  57                dev->id.id == BCMA_CORE_USB20_HOST;
  58 }
  59
  60 static inline u32 mips_read32(struct bcma_drv_mips *mcore,
  61                               u16 offset)
  62 {
  63         return bcma_read32(mcore->core, offset);
  64 }
  65
  66 static inline void mips_write32(struct bcma_drv_mips *mcore,
  67                                 u16 offset,
  68                                 u32 value)
  69 {
  70         bcma_write32(mcore->core, offset, value);
  71 }
  72
  73 static const u32 ipsflag_irq_mask[] = {
  74         0,
  75         BCMA_MIPS_IPSFLAG_IRQ1,
  76         BCMA_MIPS_IPSFLAG_IRQ2,
  77         BCMA_MIPS_IPSFLAG_IRQ3,
  78         BCMA_MIPS_IPSFLAG_IRQ4,
  79 };
  80
  81 static const u32 ipsflag_irq_shift[] = {
  82         0,
  83         BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
  84         BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
  85         BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
  86         BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
  87 };
  88
  89 static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
  90 {
  91         u32 flag;
  92
  93         if (bcma_core_mips_bcm47162a0_quirk(dev))
  94                 return dev->core_index;
  95         if (bcma_core_mips_bcm5357b0_quirk(dev))
  96                 return dev->core_index;
  97         flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
  98
  99         if (flag)
 100                 return flag & 0x1F;
 101         else
 102                 return 0x3f;
 103 }
 104
 105 /* Get the MIPS IRQ assignment for a specified device.
 106  * If unassigned, 0 is returned.
 107  * If disabled, 5 is returned.
 108  * If not supported, 6 is returned.
 109  */
 110 static unsigned int bcma_core_mips_irq(struct bcma_device *dev)
 111 {
 112         struct bcma_device *mdev = dev->bus->drv_mips.core;
 113         u32 irqflag;
 114         unsigned int irq;
 115
 116         irqflag = bcma_core_mips_irqflag(dev);
 117         if (irqflag == 0x3f)
 118                 return 6;
 119
 120         for (irq = 0; irq <= 4; irq++)
 121                 if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
 122                     (1 << irqflag))
 123                         return irq;
 124
 125         return 5;
 126 }
 127
 128 unsigned int bcma_core_irq(struct bcma_device *dev)
 129 {
 130         unsigned int mips_irq = bcma_core_mips_irq(dev);
 131         return mips_irq <= 4 ? mips_irq + 2 : 0;
 132 }
 133 EXPORT_SYMBOL(bcma_core_irq);
 134
 135 static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
 136 {
 137         unsigned int oldirq = bcma_core_mips_irq(dev);
 138         struct bcma_bus *bus = dev->bus;
 139         struct bcma_device *mdev = bus->drv_mips.core;
 140         u32 irqflag;
 141
 142         irqflag = bcma_core_mips_irqflag(dev);
 143         BUG_ON(oldirq == 6);
 144
 145         dev->irq = irq + 2;
 146
 147         /* clear the old irq */
 148         if (oldirq == 0)
 149                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 150                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
 151                             ~(1 << irqflag));
 152         else if (oldirq != 5)
 153                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(oldirq), 0);
 154
 155         /* assign the new one */
 156         if (irq == 0) {
 157                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 158                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
 159                             (1 << irqflag));
 160         } else {
 161                 u32 irqinitmask = bcma_read32(mdev,
 162                                               BCMA_MIPS_MIPS74K_INTMASK(irq));
 163                 if (irqinitmask) {
 164                         struct bcma_device *core;
 165
 166                         /* backplane irq line is in use, find out who uses
 167                          * it and set user to irq 0
 168                          */
 169                         list_for_each_entry(core, &bus->cores, list) {
 170                                 if ((1 << bcma_core_mips_irqflag(core)) ==
 171                                     irqinitmask) {
 172                                         bcma_core_mips_set_irq(core, 0);
 173                                         break;
 174                                 }
 175                         }
 176                 }
 177                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
 178                              1 << irqflag);
 179         }
 180
 181         bcma_debug(bus, "set_irq: core 0x%04x, irq %d => %d\n",
 182                    dev->id.id, oldirq <= 4 ? oldirq + 2 : 0, irq + 2);
 183 }
 184
 185 static void bcma_core_mips_set_irq_name(struct bcma_bus *bus, unsigned int irq,
 186                                         u16 coreid, u8 unit)
 187 {
 188         struct bcma_device *core;
 189
 190         core = bcma_find_core_unit(bus, coreid, unit);
 191         if (!core) {
 192                 bcma_warn(bus,
 193                           "Can not find core (id: 0x%x, unit %i) for IRQ configuration.\n",
 194                           coreid, unit);
 195                 return;
 196         }
 197
 198         bcma_core_mips_set_irq(core, irq);
 199 }
 200
 201 static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
 202 {
 203         int i;
 204         static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
 205         printk(KERN_DEBUG KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
 206         for (i = 0; i <= 6; i++)
 207                 printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
 208         printk("\n");
 209 }
 210
 211 static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
 212 {
 213         struct bcma_device *core;
 214
 215         list_for_each_entry(core, &bus->cores, list) {
 216                 bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
 217         }
 218 }
 219
 220 u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
 221 {
 222         struct bcma_bus *bus = mcore->core->bus;
 223
 224         if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
 225                 return bcma_pmu_get_cpu_clock(&bus->drv_cc);
 226
 227         bcma_err(bus, "No PMU available, need this to get the cpu clock\n");
 228         return 0;
 229 }
 230 EXPORT_SYMBOL(bcma_cpu_clock);
 231
 232 static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
 233 {
 234         struct bcma_bus *bus = mcore->core->bus;
 235         struct bcma_drv_cc *cc = &bus->drv_cc;
 236         struct bcma_pflash *pflash = &cc->pflash;
 237
 238         switch (cc->capabilities & BCMA_CC_CAP_FLASHT) {
 239         case BCMA_CC_FLASHT_STSER:
 240         case BCMA_CC_FLASHT_ATSER:
 241                 bcma_debug(bus, "Found serial flash\n");
 242                 bcma_sflash_init(cc);
 243                 break;
 244         case BCMA_CC_FLASHT_PARA:
 245                 bcma_debug(bus, "Found parallel flash\n");
 246                 pflash->present = true;
 247                 pflash->window = BCMA_SOC_FLASH2;
 248                 pflash->window_size = BCMA_SOC_FLASH2_SZ;
 249
 250                 if ((bcma_read32(cc->core, BCMA_CC_FLASH_CFG) &
 251                      BCMA_CC_FLASH_CFG_DS) == 0)
 252                         pflash->buswidth = 1;
 253                 else
 254                         pflash->buswidth = 2;
 255
 256                 bcma_pflash_data.width = pflash->buswidth;
 257                 bcma_pflash_resource.start = pflash->window;
 258                 bcma_pflash_resource.end = pflash->window + pflash->window_size;
 259
 260                 break;
 261         default:
 262                 bcma_err(bus, "Flash type not supported\n");
 263         }
 264
 265         if (cc->core->id.rev == 38 ||
 266             bus->chipinfo.id == BCMA_CHIP_ID_BCM4706) {
 267                 if (cc->capabilities & BCMA_CC_CAP_NFLASH) {
 268                         bcma_debug(bus, "Found NAND flash\n");
 269                         bcma_nflash_init(cc);
 270                 }
 271         }
 272 }
 273
 274 void bcma_core_mips_early_init(struct bcma_drv_mips *mcore)
 275 {
 276         struct bcma_bus *bus = mcore->core->bus;
 277
 278         if (mcore->early_setup_done)
 279                 return;
 280
 281         bcma_chipco_serial_init(&bus->drv_cc);
 282         bcma_core_mips_flash_detect(mcore);
 283
 284         mcore->early_setup_done = true;
 285 }
 286
 287 static void bcma_fix_i2s_irqflag(struct bcma_bus *bus)
 288 {
 289         struct bcma_device *cpu, *pcie, *i2s;
 290
 291         /* Fixup the interrupts in 4716/4748 for i2s core (2010 Broadcom SDK)
 292          * (IRQ flags > 7 are ignored when setting the interrupt masks)
 293          */
 294         if (bus->chipinfo.id != BCMA_CHIP_ID_BCM4716 &&
 295             bus->chipinfo.id != BCMA_CHIP_ID_BCM4748)
 296                 return;
 297
 298         cpu = bcma_find_core(bus, BCMA_CORE_MIPS_74K);
 299         pcie = bcma_find_core(bus, BCMA_CORE_PCIE);
 300         i2s = bcma_find_core(bus, BCMA_CORE_I2S);
 301         if (cpu && pcie && i2s &&
 302             bcma_aread32(cpu, BCMA_MIPS_OOBSELINA74) == 0x08060504 &&
 303             bcma_aread32(pcie, BCMA_MIPS_OOBSELINA74) == 0x08060504 &&
 304             bcma_aread32(i2s, BCMA_MIPS_OOBSELOUTA30) == 0x88) {
 305                 bcma_awrite32(cpu, BCMA_MIPS_OOBSELINA74, 0x07060504);
 306                 bcma_awrite32(pcie, BCMA_MIPS_OOBSELINA74, 0x07060504);
 307                 bcma_awrite32(i2s, BCMA_MIPS_OOBSELOUTA30, 0x87);
 308                 bcma_debug(bus,
 309                            "Moved i2s interrupt to oob line 7 instead of 8\n");
 310         }
 311 }
 312
 313 void bcma_core_mips_init(struct bcma_drv_mips *mcore)
 314 {
 315         struct bcma_bus *bus;
 316         struct bcma_device *core;
 317         bus = mcore->core->bus;
 318
 319         if (mcore->setup_done)
 320                 return;
 321
 322         bcma_debug(bus, "Initializing MIPS core...\n");
 323
 324         bcma_core_mips_early_init(mcore);
 325
 326         bcma_fix_i2s_irqflag(bus);
 327
 328         switch (bus->chipinfo.id) {
 329         case BCMA_CHIP_ID_BCM4716:
 330         case BCMA_CHIP_ID_BCM4748:
 331                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
 332                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
 333                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
 334                 bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_PCIE, 0);
 335                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
 336                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
 337                 break;
 338         case BCMA_CHIP_ID_BCM5356:
 339         case BCMA_CHIP_ID_BCM47162:
 340         case BCMA_CHIP_ID_BCM53572:
 341                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
 342                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
 343                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
 344                 break;
 345         case BCMA_CHIP_ID_BCM5357:
 346         case BCMA_CHIP_ID_BCM4749:
 347                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_80211, 0);
 348                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_MAC_GBIT, 0);
 349                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_USB20_HOST, 0);
 350                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_CHIPCOMMON, 0);
 351                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_I2S, 0);
 352                 break;
 353         case BCMA_CHIP_ID_BCM4706:
 354                 bcma_core_mips_set_irq_name(bus, 1, BCMA_CORE_PCIE, 0);
 355                 bcma_core_mips_set_irq_name(bus, 2, BCMA_CORE_4706_MAC_GBIT,
 356                                             0);
 357                 bcma_core_mips_set_irq_name(bus, 3, BCMA_CORE_PCIE, 1);
 358                 bcma_core_mips_set_irq_name(bus, 4, BCMA_CORE_USB20_HOST, 0);
 359                 bcma_core_mips_set_irq_name(bus, 0, BCMA_CORE_4706_CHIPCOMMON,
 360                                             0);
 361                 break;
 362         default:
 363                 list_for_each_entry(core, &bus->cores, list) {
 364                         core->irq = bcma_core_irq(core);
 365                 }
 366                 bcma_err(bus,
 367                          "Unknown device (0x%x) found, can not configure IRQs\n",
 368                          bus->chipinfo.id);
 369         }
 370         bcma_debug(bus, "IRQ reconfiguration done\n");
 371         bcma_core_mips_dump_irq(bus);
 372
 373         mcore->setup_done = true;
 374 }