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
  22 /* The 47162a0 hangs when reading MIPS DMP registers registers */
  23 static inline bool bcma_core_mips_bcm47162a0_quirk(struct bcma_device *dev)
  24 {
  25         return dev->bus->chipinfo.id == 47162 && dev->bus->chipinfo.rev == 0 &&
  26                dev->id.id == BCMA_CORE_MIPS_74K;
  27 }
  28
  29 /* The 5357b0 hangs when reading USB20H DMP registers */
  30 static inline bool bcma_core_mips_bcm5357b0_quirk(struct bcma_device *dev)
  31 {
  32         return (dev->bus->chipinfo.id == 0x5357 ||
  33                 dev->bus->chipinfo.id == 0x4749) &&
  34                dev->bus->chipinfo.pkg == 11 &&
  35                dev->id.id == BCMA_CORE_USB20_HOST;
  36 }
  37
  38 static inline u32 mips_read32(struct bcma_drv_mips *mcore,
  39                               u16 offset)
  40 {
  41         return bcma_read32(mcore->core, offset);
  42 }
  43
  44 static inline void mips_write32(struct bcma_drv_mips *mcore,
  45                                 u16 offset,
  46                                 u32 value)
  47 {
  48         bcma_write32(mcore->core, offset, value);
  49 }
  50
  51 static const u32 ipsflag_irq_mask[] = {
  52         0,
  53         BCMA_MIPS_IPSFLAG_IRQ1,
  54         BCMA_MIPS_IPSFLAG_IRQ2,
  55         BCMA_MIPS_IPSFLAG_IRQ3,
  56         BCMA_MIPS_IPSFLAG_IRQ4,
  57 };
  58
  59 static const u32 ipsflag_irq_shift[] = {
  60         0,
  61         BCMA_MIPS_IPSFLAG_IRQ1_SHIFT,
  62         BCMA_MIPS_IPSFLAG_IRQ2_SHIFT,
  63         BCMA_MIPS_IPSFLAG_IRQ3_SHIFT,
  64         BCMA_MIPS_IPSFLAG_IRQ4_SHIFT,
  65 };
  66
  67 static u32 bcma_core_mips_irqflag(struct bcma_device *dev)
  68 {
  69         u32 flag;
  70
  71         if (bcma_core_mips_bcm47162a0_quirk(dev))
  72                 return dev->core_index;
  73         if (bcma_core_mips_bcm5357b0_quirk(dev))
  74                 return dev->core_index;
  75         flag = bcma_aread32(dev, BCMA_MIPS_OOBSELOUTA30);
  76
  77         return flag & 0x1F;
  78 }
  79
  80 /* Get the MIPS IRQ assignment for a specified device.
  81  * If unassigned, 0 is returned.
  82  */
  83 unsigned int bcma_core_mips_irq(struct bcma_device *dev)
  84 {
  85         struct bcma_device *mdev = dev->bus->drv_mips.core;
  86         u32 irqflag;
  87         unsigned int irq;
  88
  89         irqflag = bcma_core_mips_irqflag(dev);
  90
  91         for (irq = 1; irq <= 4; irq++)
  92                 if (bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq)) &
  93                     (1 << irqflag))
  94                         return irq;
  95
  96         return 0;
  97 }
  98 EXPORT_SYMBOL(bcma_core_mips_irq);
  99
 100 static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
 101 {
 102         unsigned int oldirq = bcma_core_mips_irq(dev);
 103         struct bcma_bus *bus = dev->bus;
 104         struct bcma_device *mdev = bus->drv_mips.core;
 105         u32 irqflag;
 106
 107         irqflag = bcma_core_mips_irqflag(dev);
 108         BUG_ON(oldirq == 6);
 109
 110         dev->irq = irq + 2;
 111
 112         /* clear the old irq */
 113         if (oldirq == 0)
 114                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 115                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
 116                             ~(1 << irqflag));
 117         else
 118                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq), 0);
 119
 120         /* assign the new one */
 121         if (irq == 0) {
 122                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
 123                             bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
 124                             (1 << irqflag));
 125         } else {
 126                 u32 oldirqflag = bcma_read32(mdev,
 127                                              BCMA_MIPS_MIPS74K_INTMASK(irq));
 128                 if (oldirqflag) {
 129                         struct bcma_device *core;
 130
 131                         /* backplane irq line is in use, find out who uses
 132                          * it and set user to irq 0
 133                          */
 134                         list_for_each_entry_reverse(core, &bus->cores, list) {
 135                                 if ((1 << bcma_core_mips_irqflag(core)) ==
 136                                     oldirqflag) {
 137                                         bcma_core_mips_set_irq(core, 0);
 138                                         break;
 139                                 }
 140                         }
 141                 }
 142                 bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
 143                              1 << irqflag);
 144         }
 145
 146         pr_info("set_irq: core 0x%04x, irq %d => %d\n",
 147                 dev->id.id, oldirq + 2, irq + 2);
 148 }
 149
 150 static void bcma_core_mips_print_irq(struct bcma_device *dev, unsigned int irq)
 151 {
 152         int i;
 153         static const char *irq_name[] = {"2(S)", "3", "4", "5", "6", "D", "I"};
 154         printk(KERN_INFO KBUILD_MODNAME ": core 0x%04x, irq :", dev->id.id);
 155         for (i = 0; i <= 6; i++)
 156                 printk(" %s%s", irq_name[i], i == irq ? "*" : " ");
 157         printk("\n");
 158 }
 159
 160 static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
 161 {
 162         struct bcma_device *core;
 163
 164         list_for_each_entry_reverse(core, &bus->cores, list) {
 165                 bcma_core_mips_print_irq(core, bcma_core_mips_irq(core));
 166         }
 167 }
 168
 169 u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
 170 {
 171         struct bcma_bus *bus = mcore->core->bus;
 172
 173         if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
 174                 return bcma_pmu_get_clockcpu(&bus->drv_cc);
 175
 176         pr_err("No PMU available, need this to get the cpu clock\n");
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(bcma_cpu_clock);
 180
 181 static void bcma_core_mips_flash_detect(struct bcma_drv_mips *mcore)
 182 {
 183         struct bcma_bus *bus = mcore->core->bus;
 184
 185         switch (bus->drv_cc.capabilities & BCMA_CC_CAP_FLASHT) {
 186         case BCMA_CC_FLASHT_STSER:
 187         case BCMA_CC_FLASHT_ATSER:
 188                 pr_err("Serial flash not supported.\n");
 189                 break;
 190         case BCMA_CC_FLASHT_PARA:
 191                 pr_info("found parallel flash.\n");
 192                 bus->drv_cc.pflash.window = 0x1c000000;
 193                 bus->drv_cc.pflash.window_size = 0x02000000;
 194
 195                 if ((bcma_read32(bus->drv_cc.core, BCMA_CC_FLASH_CFG) &
 196                      BCMA_CC_FLASH_CFG_DS) == 0)
 197                         bus->drv_cc.pflash.buswidth = 1;
 198                 else
 199                         bus->drv_cc.pflash.buswidth = 2;
 200                 break;
 201         default:
 202                 pr_err("flash not supported.\n");
 203         }
 204 }
 205
 206 void bcma_core_mips_init(struct bcma_drv_mips *mcore)
 207 {
 208         struct bcma_bus *bus;
 209         struct bcma_device *core;
 210         bus = mcore->core->bus;
 211
 212         pr_info("Initializing MIPS core...\n");
 213
 214         if (!mcore->setup_done)
 215                 mcore->assigned_irqs = 1;
 216
 217         /* Assign IRQs to all cores on the bus */
 218         list_for_each_entry_reverse(core, &bus->cores, list) {
 219                 int mips_irq;
 220                 if (core->irq)
 221                         continue;
 222
 223                 mips_irq = bcma_core_mips_irq(core);
 224                 if (mips_irq > 4)
 225                         core->irq = 0;
 226                 else
 227                         core->irq = mips_irq + 2;
 228                 if (core->irq > 5)
 229                         continue;
 230                 switch (core->id.id) {
 231                 case BCMA_CORE_PCI:
 232                 case BCMA_CORE_PCIE:
 233                 case BCMA_CORE_ETHERNET:
 234                 case BCMA_CORE_ETHERNET_GBIT:
 235                 case BCMA_CORE_MAC_GBIT:
 236                 case BCMA_CORE_80211:
 237                 case BCMA_CORE_USB20_HOST:
 238                         /* These devices get their own IRQ line if available,
 239                          * the rest goes on IRQ0
 240                          */
 241                         if (mcore->assigned_irqs <= 4)
 242                                 bcma_core_mips_set_irq(core,
 243                                                        mcore->assigned_irqs++);
 244                         break;
 245                 }
 246         }
 247         pr_info("IRQ reconfiguration done\n");
 248         bcma_core_mips_dump_irq(bus);
 249
 250         if (mcore->setup_done)
 251                 return;
 252
 253         bcma_chipco_serial_init(&bus->drv_cc);
 254         bcma_core_mips_flash_detect(mcore);
 255         mcore->setup_done = true;
 256 }