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->irq_data.chip->irq_ack(&desc->irq_data);
  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->irq_data.chip->irq_mask(&desc->irq_data);
  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->irq_data.chip->irq_ack(&desc->irq_data);
  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->irq_data.chip->irq_unmask(&desc->irq_data);
  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 #if 0
 157         enable_irq_wake(IRQ_GPIO25);
 158 #endif
 159
 160         /*
 161          * Setup other Neponset IRQs.  SA1111 will be done by the
 162          * generic SA1111 code.
 163          */
 164         set_irq_handler(IRQ_NEPONSET_SMC9196, handle_simple_irq);
 165         set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
 166         set_irq_handler(IRQ_NEPONSET_USAR, handle_simple_irq);
 167         set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);
 168
 169         /*
 170          * Disable GPIO 0/1 drivers so the buttons work on the module.
 171          */
 172         NCR_0 = NCR_GP01_OFF;
 173
 174         return 0;
 175 }
 176
 177 #ifdef CONFIG_PM
 178
 179 /*
 180  * LDM power management.
 181  */
 182 static unsigned int neponset_saved_state;
 183
 184 static int neponset_suspend(struct platform_device *dev, pm_message_t state)
 185 {
 186         /*
 187          * Save state.
 188          */
 189         neponset_saved_state = NCR_0;
 190
 191         return 0;
 192 }
 193
 194 static int neponset_resume(struct platform_device *dev)
 195 {
 196         NCR_0 = neponset_saved_state;
 197
 198         return 0;
 199 }
 200
 201 #else
 202 #define neponset_suspend NULL
 203 #define neponset_resume  NULL
 204 #endif
 205
 206 static struct platform_driver neponset_device_driver = {
 207         .probe          = neponset_probe,
 208         .suspend        = neponset_suspend,
 209         .resume         = neponset_resume,
 210         .driver         = {
 211                 .name   = "neponset",
 212         },
 213 };
 214
 215 static struct resource neponset_resources[] = {
 216         [0] = {
 217                 .start  = 0x10000000,
 218                 .end    = 0x17ffffff,
 219                 .flags  = IORESOURCE_MEM,
 220         },
 221 };
 222
 223 static struct platform_device neponset_device = {
 224         .name           = "neponset",
 225         .id             = 0,
 226         .num_resources  = ARRAY_SIZE(neponset_resources),
 227         .resource       = neponset_resources,
 228 };
 229
 230 static struct resource sa1111_resources[] = {
 231         [0] = {
 232                 .start  = 0x40000000,
 233                 .end    = 0x40001fff,
 234                 .flags  = IORESOURCE_MEM,
 235         },
 236         [1] = {
 237                 .start  = IRQ_NEPONSET_SA1111,
 238                 .end    = IRQ_NEPONSET_SA1111,
 239                 .flags  = IORESOURCE_IRQ,
 240         },
 241 };
 242
 243 static struct sa1111_platform_data sa1111_info = {
 244         .irq_base       = IRQ_BOARD_END,
 245 };
 246
 247 static u64 sa1111_dmamask = 0xffffffffUL;
 248
 249 static struct platform_device sa1111_device = {
 250         .name           = "sa1111",
 251         .id             = 0,
 252         .dev            = {
 253                 .dma_mask = &sa1111_dmamask,
 254                 .coherent_dma_mask = 0xffffffff,
 255                 .platform_data = &sa1111_info,
 256         },
 257         .num_resources  = ARRAY_SIZE(sa1111_resources),
 258         .resource       = sa1111_resources,
 259 };
 260
 261 static struct resource smc91x_resources[] = {
 262         [0] = {
 263                 .name   = "smc91x-regs",
 264                 .start  = SA1100_CS3_PHYS,
 265                 .end    = SA1100_CS3_PHYS + 0x01ffffff,
 266                 .flags  = IORESOURCE_MEM,
 267         },
 268         [1] = {
 269                 .start  = IRQ_NEPONSET_SMC9196,
 270                 .end    = IRQ_NEPONSET_SMC9196,
 271                 .flags  = IORESOURCE_IRQ,
 272         },
 273         [2] = {
 274                 .name   = "smc91x-attrib",
 275                 .start  = SA1100_CS3_PHYS + 0x02000000,
 276                 .end    = SA1100_CS3_PHYS + 0x03ffffff,
 277                 .flags  = IORESOURCE_MEM,
 278         },
 279 };
 280
 281 static struct platform_device smc91x_device = {
 282         .name           = "smc91x",
 283         .id             = 0,
 284         .num_resources  = ARRAY_SIZE(smc91x_resources),
 285         .resource       = smc91x_resources,
 286 };
 287
 288 static struct platform_device *devices[] __initdata = {
 289         &neponset_device,
 290         &sa1111_device,
 291         &smc91x_device,
 292 };
 293
 294 extern void sa1110_mb_disable(void);
 295
 296 static int __init neponset_init(void)
 297 {
 298         platform_driver_register(&neponset_device_driver);
 299
 300         /*
 301          * The Neponset is only present on the Assabet machine type.
 302          */
 303         if (!machine_is_assabet())
 304                 return -ENODEV;
 305
 306         /*
 307          * Ensure that the memory bus request/grant signals are setup,
 308          * and the grant is held in its inactive state, whether or not
 309          * we actually have a Neponset attached.
 310          */
 311         sa1110_mb_disable();
 312
 313         if (!machine_has_neponset()) {
 314                 printk(KERN_DEBUG "Neponset expansion board not present\n");
 315                 return -ENODEV;
 316         }
 317
 318         if (WHOAMI != 0x11) {
 319                 printk(KERN_WARNING "Neponset board detected, but "
 320                         "wrong ID: %02x\n", WHOAMI);
 321                 return -ENODEV;
 322         }
 323
 324         return platform_add_devices(devices, ARRAY_SIZE(devices));
 325 }
 326
 327 subsys_initcall(neponset_init);
 328
 329 static struct map_desc neponset_io_desc[] __initdata = {
 330         {       /* System Registers */
 331                 .virtual        =  0xf3000000,
 332                 .pfn            = __phys_to_pfn(0x10000000),
 333                 .length         = SZ_1M,
 334                 .type           = MT_DEVICE
 335         }, {    /* SA-1111 */
 336                 .virtual        =  0xf4000000,
 337                 .pfn            = __phys_to_pfn(0x40000000),
 338                 .length         = SZ_1M,
 339                 .type           = MT_DEVICE
 340         }
 341 };
 342
 343 void __init neponset_map_io(void)
 344 {
 345         iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
 346 }