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