release/src-rt-6.x.4708/linux/linux-2.6.36/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/tty.h>
   8 #include <linux/ioport.h>
   9 #include <linux/serial_core.h>
  10 #include <linux/platform_device.h>
  11
  12 #include <mach/hardware.h>
  13 #include <asm/mach-types.h>
  14 #include <asm/irq.h>
  15 #include <asm/mach/map.h>
  16 #include <asm/mach/irq.h>
  17 #include <asm/mach/serial_sa1100.h>
  18 #include <mach/assabet.h>
  19 #include <mach/neponset.h>
  20 #include <asm/hardware/sa1111.h>
  21 #include <asm/sizes.h>
  22
  23 /*
  24  * Install handler for Neponset IRQ.  Note that we have to loop here
  25  * since the ETHERNET and USAR IRQs are level based, and we need to
  26  * ensure that the IRQ signal is deasserted before returning.  This
  27  * is rather unfortunate.
  28  */
  29 static void
  30 neponset_irq_handler(unsigned int irq, struct irq_desc *desc)
  31 {
  32         unsigned int irr;
  33
  34         while (1) {
  35                 /*
  36                  * Acknowledge the parent IRQ.
  37                  */
  38                 desc->chip->ack(irq);
  39
  40                 /*
  41                  * Read the interrupt reason register.  Let's have all
  42                  * active IRQ bits high.  Note: there is a typo in the
  43                  * Neponset user's guide for the SA1111 IRR level.
  44                  */
  45                 irr = IRR ^ (IRR_ETHERNET | IRR_USAR);
  46
  47                 if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0)
  48                         break;
  49
  50                 /*
  51                  * Since there is no individual mask, we have to
  52                  * mask the parent IRQ.  This is safe, since we'll
  53                  * recheck the register for any pending IRQs.
  54                  */
  55                 if (irr & (IRR_ETHERNET | IRR_USAR)) {
  56                         desc->chip->mask(irq);
  57
  58                         /*
  59                          * Ack the interrupt now to prevent re-entering
  60                          * this neponset handler.  Again, this is safe
  61                          * since we'll check the IRR register prior to
  62                          * leaving.
  63                          */
  64                         desc->chip->ack(irq);
  65
  66                         if (irr & IRR_ETHERNET) {
  67                                 generic_handle_irq(IRQ_NEPONSET_SMC9196);
  68                         }
  69
  70                         if (irr & IRR_USAR) {
  71                                 generic_handle_irq(IRQ_NEPONSET_USAR);
  72                         }
  73
  74                         desc->chip->unmask(irq);
  75                 }
  76
  77                 if (irr & IRR_SA1111) {
  78                         generic_handle_irq(IRQ_NEPONSET_SA1111);
  79                 }
  80         }
  81 }
  82
  83 static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
  84 {
  85         u_int mdm_ctl0 = MDM_CTL_0;
  86
  87         if (port->mapbase == _Ser1UTCR0) {
  88                 if (mctrl & TIOCM_RTS)
  89                         mdm_ctl0 &= ~MDM_CTL0_RTS2;
  90                 else
  91                         mdm_ctl0 |= MDM_CTL0_RTS2;
  92
  93                 if (mctrl & TIOCM_DTR)
  94                         mdm_ctl0 &= ~MDM_CTL0_DTR2;
  95                 else
  96                         mdm_ctl0 |= MDM_CTL0_DTR2;
  97         } else if (port->mapbase == _Ser3UTCR0) {
  98                 if (mctrl & TIOCM_RTS)
  99                         mdm_ctl0 &= ~MDM_CTL0_RTS1;
 100                 else
 101                         mdm_ctl0 |= MDM_CTL0_RTS1;
 102
 103                 if (mctrl & TIOCM_DTR)
 104                         mdm_ctl0 &= ~MDM_CTL0_DTR1;
 105                 else
 106                         mdm_ctl0 |= MDM_CTL0_DTR1;
 107         }
 108
 109         MDM_CTL_0 = mdm_ctl0;
 110 }
 111
 112 static u_int neponset_get_mctrl(struct uart_port *port)
 113 {
 114         u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 115         u_int mdm_ctl1 = MDM_CTL_1;
 116
 117         if (port->mapbase == _Ser1UTCR0) {
 118                 if (mdm_ctl1 & MDM_CTL1_DCD2)
 119                         ret &= ~TIOCM_CD;
 120                 if (mdm_ctl1 & MDM_CTL1_CTS2)
 121                         ret &= ~TIOCM_CTS;
 122                 if (mdm_ctl1 & MDM_CTL1_DSR2)
 123                         ret &= ~TIOCM_DSR;
 124         } else if (port->mapbase == _Ser3UTCR0) {
 125                 if (mdm_ctl1 & MDM_CTL1_DCD1)
 126                         ret &= ~TIOCM_CD;
 127                 if (mdm_ctl1 & MDM_CTL1_CTS1)
 128                         ret &= ~TIOCM_CTS;
 129                 if (mdm_ctl1 & MDM_CTL1_DSR1)
 130                         ret &= ~TIOCM_DSR;
 131         }
 132
 133         return ret;
 134 }
 135
 136 static struct sa1100_port_fns neponset_port_fns __devinitdata = {
 137         .set_mctrl      = neponset_set_mctrl,
 138         .get_mctrl      = neponset_get_mctrl,
 139 };
 140
 141 static int __devinit neponset_probe(struct platform_device *dev)
 142 {
 143         sa1100_register_uart_fns(&neponset_port_fns);
 144
 145         /*
 146          * Install handler for GPIO25.
 147          */
 148         set_irq_type(IRQ_GPIO25, IRQ_TYPE_EDGE_RISING);
 149         set_irq_chained_handler(IRQ_GPIO25, neponset_irq_handler);
 150
 151         /*
 152          * We would set IRQ_GPIO25 to be a wake-up IRQ, but
 153          * unfortunately something on the Neponset activates
 154          * this IRQ on sleep (ethernet?)
 155          */
 156
 157         /*
 158          * Setup other Neponset IRQs.  SA1111 will be done by the
 159          * generic SA1111 code.
 160          */
 161         set_irq_handler(IRQ_NEPONSET_SMC9196, handle_simple_irq);
 162         set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
 163         set_irq_handler(IRQ_NEPONSET_USAR, handle_simple_irq);
 164         set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);
 165
 166         /*
 167          * Disable GPIO 0/1 drivers so the buttons work on the module.
 168          */
 169         NCR_0 = NCR_GP01_OFF;
 170
 171         return 0;
 172 }
 173
 174 #ifdef CONFIG_PM
 175
 176 /*
 177  * LDM power management.
 178  */
 179 static unsigned int neponset_saved_state;
 180
 181 static int neponset_suspend(struct platform_device *dev, pm_message_t state)
 182 {
 183         /*
 184          * Save state.
 185          */
 186         neponset_saved_state = NCR_0;
 187
 188         return 0;
 189 }
 190
 191 static int neponset_resume(struct platform_device *dev)
 192 {
 193         NCR_0 = neponset_saved_state;
 194
 195         return 0;
 196 }
 197
 198 #else
 199 #define neponset_suspend NULL
 200 #define neponset_resume  NULL
 201 #endif
 202
 203 static struct platform_driver neponset_device_driver = {
 204         .probe          = neponset_probe,
 205         .suspend        = neponset_suspend,
 206         .resume         = neponset_resume,
 207         .driver         = {
 208                 .name   = "neponset",
 209         },
 210 };
 211
 212 static struct resource neponset_resources[] = {
 213         [0] = {
 214                 .start  = 0x10000000,
 215                 .end    = 0x17ffffff,
 216                 .flags  = IORESOURCE_MEM,
 217         },
 218 };
 219
 220 static struct platform_device neponset_device = {
 221         .name           = "neponset",
 222         .id             = 0,
 223         .num_resources  = ARRAY_SIZE(neponset_resources),
 224         .resource       = neponset_resources,
 225 };
 226
 227 static struct resource sa1111_resources[] = {
 228         [0] = {
 229                 .start  = 0x40000000,
 230                 .end    = 0x40001fff,
 231                 .flags  = IORESOURCE_MEM,
 232         },
 233         [1] = {
 234                 .start  = IRQ_NEPONSET_SA1111,
 235                 .end    = IRQ_NEPONSET_SA1111,
 236                 .flags  = IORESOURCE_IRQ,
 237         },
 238 };
 239
 240 static struct sa1111_platform_data sa1111_info = {
 241         .irq_base       = IRQ_BOARD_END,
 242 };
 243
 244 static u64 sa1111_dmamask = 0xffffffffUL;
 245
 246 static struct platform_device sa1111_device = {
 247         .name           = "sa1111",
 248         .id             = 0,
 249         .dev            = {
 250                 .dma_mask = &sa1111_dmamask,
 251                 .coherent_dma_mask = 0xffffffff,
 252                 .platform_data = &sa1111_info,
 253         },
 254         .num_resources  = ARRAY_SIZE(sa1111_resources),
 255         .resource       = sa1111_resources,
 256 };
 257
 258 static struct resource smc91x_resources[] = {
 259         [0] = {
 260                 .name   = "smc91x-regs",
 261                 .start  = SA1100_CS3_PHYS,
 262                 .end    = SA1100_CS3_PHYS + 0x01ffffff,
 263                 .flags  = IORESOURCE_MEM,
 264         },
 265         [1] = {
 266                 .start  = IRQ_NEPONSET_SMC9196,
 267                 .end    = IRQ_NEPONSET_SMC9196,
 268                 .flags  = IORESOURCE_IRQ,
 269         },
 270         [2] = {
 271                 .name   = "smc91x-attrib",
 272                 .start  = SA1100_CS3_PHYS + 0x02000000,
 273                 .end    = SA1100_CS3_PHYS + 0x03ffffff,
 274                 .flags  = IORESOURCE_MEM,
 275         },
 276 };
 277
 278 static struct platform_device smc91x_device = {
 279         .name           = "smc91x",
 280         .id             = 0,
 281         .num_resources  = ARRAY_SIZE(smc91x_resources),
 282         .resource       = smc91x_resources,
 283 };
 284
 285 static struct platform_device *devices[] __initdata = {
 286         &neponset_device,
 287         &sa1111_device,
 288         &smc91x_device,
 289 };
 290
 291 extern void sa1110_mb_disable(void);
 292
 293 static int __init neponset_init(void)
 294 {
 295         platform_driver_register(&neponset_device_driver);
 296
 297         /*
 298          * The Neponset is only present on the Assabet machine type.
 299          */
 300         if (!machine_is_assabet())
 301                 return -ENODEV;
 302
 303         /*
 304          * Ensure that the memory bus request/grant signals are setup,
 305          * and the grant is held in its inactive state, whether or not
 306          * we actually have a Neponset attached.
 307          */
 308         sa1110_mb_disable();
 309
 310         if (!machine_has_neponset()) {
 311                 printk(KERN_DEBUG "Neponset expansion board not present\n");
 312                 return -ENODEV;
 313         }
 314
 315         if (WHOAMI != 0x11) {
 316                 printk(KERN_WARNING "Neponset board detected, but "
 317                         "wrong ID: %02x\n", WHOAMI);
 318                 return -ENODEV;
 319         }
 320
 321         return platform_add_devices(devices, ARRAY_SIZE(devices));
 322 }
 323
 324 subsys_initcall(neponset_init);
 325
 326 static struct map_desc neponset_io_desc[] __initdata = {
 327         {       /* System Registers */
 328                 .virtual        =  0xf3000000,
 329                 .pfn            = __phys_to_pfn(0x10000000),
 330                 .length         = SZ_1M,
 331                 .type           = MT_DEVICE
 332         }, {    /* SA-1111 */
 333                 .virtual        =  0xf4000000,
 334                 .pfn            = __phys_to_pfn(0x40000000),
 335                 .length         = SZ_1M,
 336                 .type           = MT_DEVICE
 337         }
 338 };
 339
 340 void __init neponset_map_io(void)
 341 {
 342         iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
 343 }