arch/arm/mach-sa1100/neponset.c

   1 /*
   2  * linux/arch/arm/mach-sa1100/neponset.c
   3  *
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/init.h>
   7 #include <linux/ptrace.h>
   8 #include <linux/tty.h>
   9 #include <linux/ioport.h>
  10 #include <linux/serial_core.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/slab.h>
  13
  14 #include <asm/hardware.h>
  15 #include <asm/mach-types.h>
  16 #include <asm/irq.h>
  17 #include <asm/mach/map.h>
  18 #include <asm/mach/irq.h>
  19 #include <asm/mach/serial_sa1100.h>
  20 #include <asm/arch/assabet.h>
  21 #include <asm/arch/neponset.h>
  22 #include <asm/hardware/sa1111.h>
  23 #include <asm/sizes.h>
  24
  25 /*
  26  * Install handler for Neponset IRQ.  Note that we have to loop here
  27  * since the ETHERNET and USAR IRQs are level based, and we need to
  28  * ensure that the IRQ signal is deasserted before returning.  This
  29  * is rather unfortunate.
  30  */
  31 static void
  32 neponset_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
  33 {
  34         unsigned int irr;
  35
  36         while (1) {
  37                 struct irqdesc *d;
  38
  39                 /*
  40                  * Acknowledge the parent IRQ.
  41                  */
  42                 desc->chip->ack(irq);
  43
  44                 /*
  45                  * Read the interrupt reason register.  Let's have all
  46                  * active IRQ bits high.  Note: there is a typo in the
  47                  * Neponset user's guide for the SA1111 IRR level.
  48                  */
  49                 irr = IRR ^ (IRR_ETHERNET | IRR_USAR);
  50
  51                 if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
  52                         break;
  53
  54                 /*
  55                  * Since there is no individual mask, we have to
  56                  * mask the parent IRQ.  This is safe, since we'll
  57                  * recheck the register for any pending IRQs.
  58                  */
  59                 if (irr & (IRR_ETHERNET | IRR_USAR)) {
  60                         desc->chip->mask(irq);
  61
  62                         /*
  63                          * Ack the interrupt now to prevent re-entering
  64                          * this neponset handler.  Again, this is safe
  65                          * since we'll check the IRR register prior to
  66                          * leaving.
  67                          */
  68                         desc->chip->ack(irq);
  69
  70                         if (irr & IRR_ETHERNET) {
  71                                 d = irq_desc + IRQ_NEPONSET_SMC9196;
  72                                 desc_handle_irq(IRQ_NEPONSET_SMC9196, d, regs);
  73                         }
  74
  75                         if (irr & IRR_USAR) {
  76                                 d = irq_desc + IRQ_NEPONSET_USAR;
  77                                 desc_handle_irq(IRQ_NEPONSET_USAR, d, regs);
  78                         }
  79
  80                         desc->chip->unmask(irq);
  81                 }
  82
  83                 if (irr & IRR_SA1111) {
  84                         d = irq_desc + IRQ_NEPONSET_SA1111;
  85                         desc_handle_irq(IRQ_NEPONSET_SA1111, d, regs);
  86                 }
  87         }
  88 }
  89
  90 static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
  91 {
  92         u_int mdm_ctl0 = MDM_CTL_0;
  93
  94         if (port->mapbase == _Ser1UTCR0) {
  95                 if (mctrl & TIOCM_RTS)
  96                         mdm_ctl0 &= ~MDM_CTL0_RTS2;
  97                 else
  98                         mdm_ctl0 |= MDM_CTL0_RTS2;
  99
 100                 if (mctrl & TIOCM_DTR)
 101                         mdm_ctl0 &= ~MDM_CTL0_DTR2;
 102                 else
 103                         mdm_ctl0 |= MDM_CTL0_DTR2;
 104         } else if (port->mapbase == _Ser3UTCR0) {
 105                 if (mctrl & TIOCM_RTS)
 106                         mdm_ctl0 &= ~MDM_CTL0_RTS1;
 107                 else
 108                         mdm_ctl0 |= MDM_CTL0_RTS1;
 109
 110                 if (mctrl & TIOCM_DTR)
 111                         mdm_ctl0 &= ~MDM_CTL0_DTR1;
 112                 else
 113                         mdm_ctl0 |= MDM_CTL0_DTR1;
 114         }
 115
 116         MDM_CTL_0 = mdm_ctl0;
 117 }
 118
 119 static u_int neponset_get_mctrl(struct uart_port *port)
 120 {
 121         u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 122         u_int mdm_ctl1 = MDM_CTL_1;
 123
 124         if (port->mapbase == _Ser1UTCR0) {
 125                 if (mdm_ctl1 & MDM_CTL1_DCD2)
 126                         ret &= ~TIOCM_CD;
 127                 if (mdm_ctl1 & MDM_CTL1_CTS2)
 128                         ret &= ~TIOCM_CTS;
 129                 if (mdm_ctl1 & MDM_CTL1_DSR2)
 130                         ret &= ~TIOCM_DSR;
 131         } else if (port->mapbase == _Ser3UTCR0) {
 132                 if (mdm_ctl1 & MDM_CTL1_DCD1)
 133                         ret &= ~TIOCM_CD;
 134                 if (mdm_ctl1 & MDM_CTL1_CTS1)
 135                         ret &= ~TIOCM_CTS;
 136                 if (mdm_ctl1 & MDM_CTL1_DSR1)
 137                         ret &= ~TIOCM_DSR;
 138         }
 139
 140         return ret;
 141 }
 142
 143 static struct sa1100_port_fns neponset_port_fns __initdata = {
 144         .set_mctrl      = neponset_set_mctrl,
 145         .get_mctrl      = neponset_get_mctrl,
 146 };
 147
 148 static int neponset_probe(struct platform_device *dev)
 149 {
 150         sa1100_register_uart_fns(&neponset_port_fns);
 151
 152         /*
 153          * Install handler for GPIO25.
 154          */
 155         set_irq_type(IRQ_GPIO25, IRQT_RISING);
 156         set_irq_chained_handler(IRQ_GPIO25, neponset_irq_handler);
 157
 158         /*
 159          * We would set IRQ_GPIO25 to be a wake-up IRQ, but
 160          * unfortunately something on the Neponset activates
 161          * this IRQ on sleep (ethernet?)
 162          */
 163 #if 0
 164         enable_irq_wake(IRQ_GPIO25);
 165 #endif
 166
 167         /*
 168          * Setup other Neponset IRQs.  SA1111 will be done by the
 169          * generic SA1111 code.
 170          */
 171         set_irq_handler(IRQ_NEPONSET_SMC9196, do_simple_IRQ);
 172         set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
 173         set_irq_handler(IRQ_NEPONSET_USAR, do_simple_IRQ);
 174         set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);
 175
 176         /*
 177          * Disable GPIO 0/1 drivers so the buttons work on the module.
 178          */
 179         NCR_0 = NCR_GP01_OFF;
 180
 181         return 0;
 182 }
 183
 184 #ifdef CONFIG_PM
 185
 186 /*
 187  * LDM power management.
 188  */
 189 static int neponset_suspend(struct platform_device *dev, pm_message_t state)
 190 {
 191         /*
 192          * Save state.
 193          */
 194         if (!dev->dev.power.saved_state)
 195                 dev->dev.power.saved_state = kmalloc(sizeof(unsigned int), GFP_KERNEL);
 196         if (!dev->dev.power.saved_state)
 197                 return -ENOMEM;
 198
 199         *(unsigned int *)dev->dev.power.saved_state = NCR_0;
 200
 201         return 0;
 202 }
 203
 204 static int neponset_resume(struct platform_device *dev)
 205 {
 206         if (dev->dev.power.saved_state) {
 207                 NCR_0 = *(unsigned int *)dev->dev.power.saved_state;
 208                 kfree(dev->dev.power.saved_state);
 209                 dev->dev.power.saved_state = NULL;
 210         }
 211
 212         return 0;
 213 }
 214
 215 #else
 216 #define neponset_suspend NULL
 217 #define neponset_resume  NULL
 218 #endif
 219
 220 static struct platform_driver neponset_device_driver = {
 221         .probe          = neponset_probe,
 222         .suspend        = neponset_suspend,
 223         .resume         = neponset_resume,
 224         .driver         = {
 225                 .name   = "neponset",
 226         },
 227 };
 228
 229 static struct resource neponset_resources[] = {
 230         [0] = {
 231                 .start  = 0x10000000,
 232                 .end    = 0x17ffffff,
 233                 .flags  = IORESOURCE_MEM,
 234         },
 235 };
 236
 237 static struct platform_device neponset_device = {
 238         .name           = "neponset",
 239         .id             = 0,
 240         .num_resources  = ARRAY_SIZE(neponset_resources),
 241         .resource       = neponset_resources,
 242 };
 243
 244 static struct resource sa1111_resources[] = {
 245         [0] = {
 246                 .start  = 0x40000000,
 247                 .end    = 0x40001fff,
 248                 .flags  = IORESOURCE_MEM,
 249         },
 250         [1] = {
 251                 .start  = IRQ_NEPONSET_SA1111,
 252                 .end    = IRQ_NEPONSET_SA1111,
 253                 .flags  = IORESOURCE_IRQ,
 254         },
 255 };
 256
 257 static u64 sa1111_dmamask = 0xffffffffUL;
 258
 259 static struct platform_device sa1111_device = {
 260         .name           = "sa1111",
 261         .id             = 0,
 262         .dev            = {
 263                 .dma_mask = &sa1111_dmamask,
 264                 .coherent_dma_mask = 0xffffffff,
 265         },
 266         .num_resources  = ARRAY_SIZE(sa1111_resources),
 267         .resource       = sa1111_resources,
 268 };
 269
 270 static struct resource smc91x_resources[] = {
 271         [0] = {
 272                 .name   = "smc91x-regs",
 273                 .start  = SA1100_CS3_PHYS,
 274                 .end    = SA1100_CS3_PHYS + 0x01ffffff,
 275                 .flags  = IORESOURCE_MEM,
 276         },
 277         [1] = {
 278                 .start  = IRQ_NEPONSET_SMC9196,
 279                 .end    = IRQ_NEPONSET_SMC9196,
 280                 .flags  = IORESOURCE_IRQ,
 281         },
 282         [2] = {
 283                 .name   = "smc91x-attrib",
 284                 .start  = SA1100_CS3_PHYS + 0x02000000,
 285                 .end    = SA1100_CS3_PHYS + 0x03ffffff,
 286                 .flags  = IORESOURCE_MEM,
 287         },
 288 };
 289
 290 static struct platform_device smc91x_device = {
 291         .name           = "smc91x",
 292         .id             = 0,
 293         .num_resources  = ARRAY_SIZE(smc91x_resources),
 294         .resource       = smc91x_resources,
 295 };
 296
 297 static struct platform_device *devices[] __initdata = {
 298         &neponset_device,
 299         &sa1111_device,
 300         &smc91x_device,
 301 };
 302
 303 static int __init neponset_init(void)
 304 {
 305         platform_driver_register(&neponset_device_driver);
 306
 307         /*
 308          * The Neponset is only present on the Assabet machine type.
 309          */
 310         if (!machine_is_assabet())
 311                 return -ENODEV;
 312
 313         /*
 314          * Ensure that the memory bus request/grant signals are setup,
 315          * and the grant is held in its inactive state, whether or not
 316          * we actually have a Neponset attached.
 317          */
 318         sa1110_mb_disable();
 319
 320         if (!machine_has_neponset()) {
 321                 printk(KERN_DEBUG "Neponset expansion board not present\n");
 322                 return -ENODEV;
 323         }
 324
 325         if (WHOAMI != 0x11) {
 326                 printk(KERN_WARNING "Neponset board detected, but "
 327                         "wrong ID: %02x\n", WHOAMI);
 328                 return -ENODEV;
 329         }
 330
 331         return platform_add_devices(devices, ARRAY_SIZE(devices));
 332 }
 333
 334 subsys_initcall(neponset_init);
 335
 336 static struct map_desc neponset_io_desc[] __initdata = {
 337         {       /* System Registers */
 338                 .virtual        =  0xf3000000,
 339                 .pfn            = __phys_to_pfn(0x10000000),
 340                 .length         = SZ_1M,
 341                 .type           = MT_DEVICE
 342         }, {    /* SA-1111 */
 343                 .virtual        =  0xf4000000,
 344                 .pfn            = __phys_to_pfn(0x40000000),
 345                 .length         = SZ_1M,
 346                 .type           = MT_DEVICE
 347         }
 348 };
 349
 350 void __init neponset_map_io(void)
 351 {
 352         iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
 353 }