drivers/ssb/driver_mipscore.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * Broadcom MIPS core driver
   4  *
   5  * Copyright 2005, Broadcom Corporation
   6  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
   7  *
   8  * Licensed under the GNU/GPL. See COPYING for details.
   9  */
  10
  11 #include <linux/ssb/ssb.h>
  12
  13 #include <linux/mtd/physmap.h>
  14 #include <linux/serial.h>
  15 #include <linux/serial_core.h>
  16 #include <linux/serial_reg.h>
  17 #include <linux/time.h>
  18
  19 #include "ssb_private.h"
  20
  21 static const char *part_probes[] = { "bcm47xxpart", NULL };
  22
  23 static struct physmap_flash_data ssb_pflash_data = {
  24         .part_probe_types       = part_probes,
  25 };
  26
  27 static struct resource ssb_pflash_resource = {
  28         .name   = "ssb_pflash",
  29         .flags  = IORESOURCE_MEM,
  30 };
  31
  32 struct platform_device ssb_pflash_dev = {
  33         .name           = "physmap-flash",
  34         .dev            = {
  35                 .platform_data  = &ssb_pflash_data,
  36         },
  37         .resource       = &ssb_pflash_resource,
  38         .num_resources  = 1,
  39 };
  40
  41 static inline u32 mips_read32(struct ssb_mipscore *mcore,
  42                               u16 offset)
  43 {
  44         return ssb_read32(mcore->dev, offset);
  45 }
  46
  47 static inline void mips_write32(struct ssb_mipscore *mcore,
  48                                 u16 offset,
  49                                 u32 value)
  50 {
  51         ssb_write32(mcore->dev, offset, value);
  52 }
  53
  54 static const u32 ipsflag_irq_mask[] = {
  55         0,
  56         SSB_IPSFLAG_IRQ1,
  57         SSB_IPSFLAG_IRQ2,
  58         SSB_IPSFLAG_IRQ3,
  59         SSB_IPSFLAG_IRQ4,
  60 };
  61
  62 static const u32 ipsflag_irq_shift[] = {
  63         0,
  64         SSB_IPSFLAG_IRQ1_SHIFT,
  65         SSB_IPSFLAG_IRQ2_SHIFT,
  66         SSB_IPSFLAG_IRQ3_SHIFT,
  67         SSB_IPSFLAG_IRQ4_SHIFT,
  68 };
  69
  70 static inline u32 ssb_irqflag(struct ssb_device *dev)
  71 {
  72         u32 tpsflag = ssb_read32(dev, SSB_TPSFLAG);
  73         if (tpsflag)
  74                 return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
  75         else
  76                 /* not irq supported */
  77                 return 0x3f;
  78 }
  79
  80 static struct ssb_device *find_device(struct ssb_device *rdev, int irqflag)
  81 {
  82         struct ssb_bus *bus = rdev->bus;
  83         int i;
  84         for (i = 0; i < bus->nr_devices; i++) {
  85                 struct ssb_device *dev;
  86                 dev = &(bus->devices[i]);
  87                 if (ssb_irqflag(dev) == irqflag)
  88                         return dev;
  89         }
  90         return NULL;
  91 }
  92
  93 /* Get the MIPS IRQ assignment for a specified device.
  94  * If unassigned, 0 is returned.
  95  * If disabled, 5 is returned.
  96  * If not supported, 6 is returned.
  97  */
  98 unsigned int ssb_mips_irq(struct ssb_device *dev)
  99 {
 100         struct ssb_bus *bus = dev->bus;
 101         struct ssb_device *mdev = bus->mipscore.dev;
 102         u32 irqflag;
 103         u32 ipsflag;
 104         u32 tmp;
 105         unsigned int irq;
 106
 107         irqflag = ssb_irqflag(dev);
 108         if (irqflag == 0x3f)
 109                 return 6;
 110         ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
 111         for (irq = 1; irq <= 4; irq++) {
 112                 tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
 113                 if (tmp == irqflag)
 114                         break;
 115         }
 116         if (irq == 5) {
 117                 if ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC))
 118                         irq = 0;
 119         }
 120
 121         return irq;
 122 }
 123
 124 static void clear_irq(struct ssb_bus *bus, unsigned int irq)
 125 {
 126         struct ssb_device *dev = bus->mipscore.dev;
 127
 128         /* Clear the IRQ in the MIPScore backplane registers */
 129         if (irq == 0) {
 130                 ssb_write32(dev, SSB_INTVEC, 0);
 131         } else {
 132                 ssb_write32(dev, SSB_IPSFLAG,
 133                             ssb_read32(dev, SSB_IPSFLAG) |
 134                             ipsflag_irq_mask[irq]);
 135         }
 136 }
 137
 138 static void set_irq(struct ssb_device *dev, unsigned int irq)
 139 {
 140         unsigned int oldirq = ssb_mips_irq(dev);
 141         struct ssb_bus *bus = dev->bus;
 142         struct ssb_device *mdev = bus->mipscore.dev;
 143         u32 irqflag = ssb_irqflag(dev);
 144
 145         BUG_ON(oldirq == 6);
 146
 147         dev->irq = irq + 2;
 148
 149         /* clear the old irq */
 150         if (oldirq == 0)
 151                 ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
 152         else if (oldirq != 5)
 153                 clear_irq(bus, oldirq);
 154
 155         /* assign the new one */
 156         if (irq == 0) {
 157                 ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) | ssb_read32(mdev, SSB_INTVEC)));
 158         } else {
 159                 u32 ipsflag = ssb_read32(mdev, SSB_IPSFLAG);
 160                 if ((ipsflag & ipsflag_irq_mask[irq]) != ipsflag_irq_mask[irq]) {
 161                         u32 oldipsflag = (ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq];
 162                         struct ssb_device *olddev = find_device(dev, oldipsflag);
 163                         if (olddev)
 164                                 set_irq(olddev, 0);
 165                 }
 166                 irqflag <<= ipsflag_irq_shift[irq];
 167                 irqflag |= (ipsflag & ~ipsflag_irq_mask[irq]);
 168                 ssb_write32(mdev, SSB_IPSFLAG, irqflag);
 169         }
 170         ssb_dprintk(KERN_INFO PFX
 171                     "set_irq: core 0x%04x, irq %d => %d\n",
 172                     dev->id.coreid, oldirq+2, irq+2);
 173 }
 174
 175 static void print_irq(struct ssb_device *dev, unsigned int irq)
 176 {
 177         int i;
 178         static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
 179         ssb_dprintk(KERN_INFO PFX
 180                 "core 0x%04x, irq :", dev->id.coreid);
 181         for (i = 0; i <= 6; i++) {
 182                 ssb_dprintk(" %s%s", irq_name[i], i==irq?"*":" ");
 183         }
 184         ssb_dprintk("\n");
 185 }
 186
 187 static void dump_irq(struct ssb_bus *bus)
 188 {
 189         int i;
 190         for (i = 0; i < bus->nr_devices; i++) {
 191                 struct ssb_device *dev;
 192                 dev = &(bus->devices[i]);
 193                 print_irq(dev, ssb_mips_irq(dev));
 194         }
 195 }
 196
 197 static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
 198 {
 199         struct ssb_bus *bus = mcore->dev->bus;
 200
 201         if (ssb_extif_available(&bus->extif))
 202                 mcore->nr_serial_ports = ssb_extif_serial_init(&bus->extif, mcore->serial_ports);
 203         else if (ssb_chipco_available(&bus->chipco))
 204                 mcore->nr_serial_ports = ssb_chipco_serial_init(&bus->chipco, mcore->serial_ports);
 205         else
 206                 mcore->nr_serial_ports = 0;
 207 }
 208
 209 static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
 210 {
 211         struct ssb_bus *bus = mcore->dev->bus;
 212         struct ssb_pflash *pflash = &mcore->pflash;
 213
 214         /* When there is no chipcommon on the bus there is 4MB flash */
 215         if (!ssb_chipco_available(&bus->chipco)) {
 216                 pflash->present = true;
 217                 pflash->buswidth = 2;
 218                 pflash->window = SSB_FLASH1;
 219                 pflash->window_size = SSB_FLASH1_SZ;
 220                 goto ssb_pflash;
 221         }
 222
 223         /* There is ChipCommon, so use it to read info about flash */
 224         switch (bus->chipco.capabilities & SSB_CHIPCO_CAP_FLASHT) {
 225         case SSB_CHIPCO_FLASHT_STSER:
 226         case SSB_CHIPCO_FLASHT_ATSER:
 227                 pr_debug("Found serial flash\n");
 228                 ssb_sflash_init(&bus->chipco);
 229                 break;
 230         case SSB_CHIPCO_FLASHT_PARA:
 231                 pr_debug("Found parallel flash\n");
 232                 pflash->present = true;
 233                 pflash->window = SSB_FLASH2;
 234                 pflash->window_size = SSB_FLASH2_SZ;
 235                 if ((ssb_read32(bus->chipco.dev, SSB_CHIPCO_FLASH_CFG)
 236                                & SSB_CHIPCO_CFG_DS16) == 0)
 237                         pflash->buswidth = 1;
 238                 else
 239                         pflash->buswidth = 2;
 240                 break;
 241         }
 242
 243 ssb_pflash:
 244         if (pflash->present) {
 245                 ssb_pflash_data.width = pflash->buswidth;
 246                 ssb_pflash_resource.start = pflash->window;
 247                 ssb_pflash_resource.end = pflash->window + pflash->window_size;
 248         }
 249 }
 250
 251 u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
 252 {
 253         struct ssb_bus *bus = mcore->dev->bus;
 254         u32 pll_type, n, m, rate = 0;
 255
 256         if (bus->chipco.capabilities & SSB_CHIPCO_CAP_PMU)
 257                 return ssb_pmu_get_cpu_clock(&bus->chipco);
 258
 259         if (ssb_extif_available(&bus->extif)) {
 260                 ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
 261         } else if (ssb_chipco_available(&bus->chipco)) {
 262                 ssb_chipco_get_clockcpu(&bus->chipco, &pll_type, &n, &m);
 263         } else
 264                 return 0;
 265
 266         if ((pll_type == SSB_PLLTYPE_5) || (bus->chip_id == 0x5365)) {
 267                 rate = 200000000;
 268         } else {
 269                 rate = ssb_calc_clock_rate(pll_type, n, m);
 270         }
 271
 272         if (pll_type == SSB_PLLTYPE_6) {
 273                 rate *= 2;
 274         }
 275
 276         return rate;
 277 }
 278
 279 void ssb_mipscore_init(struct ssb_mipscore *mcore)
 280 {
 281         struct ssb_bus *bus;
 282         struct ssb_device *dev;
 283         unsigned long hz, ns;
 284         unsigned int irq, i;
 285
 286         if (!mcore->dev)
 287                 return; /* We don't have a MIPS core */
 288
 289         ssb_dprintk(KERN_INFO PFX "Initializing MIPS core...\n");
 290
 291         bus = mcore->dev->bus;
 292         hz = ssb_clockspeed(bus);
 293         if (!hz)
 294                 hz = 100000000;
 295         ns = 1000000000 / hz;
 296
 297         if (ssb_extif_available(&bus->extif))
 298                 ssb_extif_timing_init(&bus->extif, ns);
 299         else if (ssb_chipco_available(&bus->chipco))
 300                 ssb_chipco_timing_init(&bus->chipco, ns);
 301
 302         /* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
 303         for (irq = 2, i = 0; i < bus->nr_devices; i++) {
 304                 int mips_irq;
 305                 dev = &(bus->devices[i]);
 306                 mips_irq = ssb_mips_irq(dev);
 307                 if (mips_irq > 4)
 308                         dev->irq = 0;
 309                 else
 310                         dev->irq = mips_irq + 2;
 311                 if (dev->irq > 5)
 312                         continue;
 313                 switch (dev->id.coreid) {
 314                 case SSB_DEV_USB11_HOST:
 315                         /* shouldn't need a separate irq line for non-4710, most of them have a proper
 316                          * external usb controller on the pci */
 317                         if ((bus->chip_id == 0x4710) && (irq <= 4)) {
 318                                 set_irq(dev, irq++);
 319                         }
 320                         break;
 321                 case SSB_DEV_PCI:
 322                 case SSB_DEV_ETHERNET:
 323                 case SSB_DEV_ETHERNET_GBIT:
 324                 case SSB_DEV_80211:
 325                 case SSB_DEV_USB20_HOST:
 326                         /* These devices get their own IRQ line if available, the rest goes on IRQ0 */
 327                         if (irq <= 4) {
 328                                 set_irq(dev, irq++);
 329                                 break;
 330                         }
 331                         /* fallthrough */
 332                 case SSB_DEV_EXTIF:
 333                         set_irq(dev, 0);
 334                         break;
 335                 }
 336         }
 337         ssb_dprintk(KERN_INFO PFX "after irq reconfiguration\n");
 338         dump_irq(bus);
 339
 340         ssb_mips_serial_init(mcore);
 341         ssb_mips_flash_detect(mcore);
 342 }