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/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                         if (irr & IRR_ETHERNET) {
  63                                 d = irq_desc + IRQ_NEPONSET_SMC9196;
  64                                 d->handle(IRQ_NEPONSET_SMC9196, d, regs);
  65                         }
  66
  67                         if (irr & IRR_USAR) {
  68                                 d = irq_desc + IRQ_NEPONSET_USAR;
  69                                 d->handle(IRQ_NEPONSET_USAR, d, regs);
  70                         }
  71
  72                         desc->chip->unmask(irq);
  73                 }
  74
  75                 if (irr & IRR_SA1111) {
  76                         d = irq_desc + IRQ_NEPONSET_SA1111;
  77                         d->handle(IRQ_NEPONSET_SA1111, d, regs);
  78                 }
  79         }
  80 }
  81
  82 static void neponset_set_mctrl(struct uart_port *port, u_int mctrl)
  83 {
  84         u_int mdm_ctl0 = MDM_CTL_0;
  85
  86         if (port->mapbase == _Ser1UTCR0) {
  87                 if (mctrl & TIOCM_RTS)
  88                         mdm_ctl0 &= ~MDM_CTL0_RTS2;
  89                 else
  90                         mdm_ctl0 |= MDM_CTL0_RTS2;
  91
  92                 if (mctrl & TIOCM_DTR)
  93                         mdm_ctl0 &= ~MDM_CTL0_DTR2;
  94                 else
  95                         mdm_ctl0 |= MDM_CTL0_DTR2;
  96         } else if (port->mapbase == _Ser3UTCR0) {
  97                 if (mctrl & TIOCM_RTS)
  98                         mdm_ctl0 &= ~MDM_CTL0_RTS1;
  99                 else
 100                         mdm_ctl0 |= MDM_CTL0_RTS1;
 101
 102                 if (mctrl & TIOCM_DTR)
 103                         mdm_ctl0 &= ~MDM_CTL0_DTR1;
 104                 else
 105                         mdm_ctl0 |= MDM_CTL0_DTR1;
 106         }
 107
 108         MDM_CTL_0 = mdm_ctl0;
 109 }
 110
 111 static u_int neponset_get_mctrl(struct uart_port *port)
 112 {
 113         u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 114         u_int mdm_ctl1 = MDM_CTL_1;
 115
 116         if (port->mapbase == _Ser1UTCR0) {
 117                 if (mdm_ctl1 & MDM_CTL1_DCD2)
 118                         ret &= ~TIOCM_CD;
 119                 if (mdm_ctl1 & MDM_CTL1_CTS2)
 120                         ret &= ~TIOCM_CTS;
 121                 if (mdm_ctl1 & MDM_CTL1_DSR2)
 122                         ret &= ~TIOCM_DSR;
 123         } else if (port->mapbase == _Ser3UTCR0) {
 124                 if (mdm_ctl1 & MDM_CTL1_DCD1)
 125                         ret &= ~TIOCM_CD;
 126                 if (mdm_ctl1 & MDM_CTL1_CTS1)
 127                         ret &= ~TIOCM_CTS;
 128                 if (mdm_ctl1 & MDM_CTL1_DSR1)
 129                         ret &= ~TIOCM_DSR;
 130         }
 131
 132         return ret;
 133 }
 134
 135 static struct sa1100_port_fns neponset_port_fns __initdata = {
 136         .set_mctrl      = neponset_set_mctrl,
 137         .get_mctrl      = neponset_get_mctrl,
 138 };
 139
 140 static int neponset_probe(struct device *dev)
 141 {
 142         sa1100_register_uart_fns(&neponset_port_fns);
 143
 144         /*
 145          * Install handler for GPIO25.
 146          */
 147         set_irq_type(IRQ_GPIO25, IRQT_RISING);
 148         set_irq_chained_handler(IRQ_GPIO25, neponset_irq_handler);
 149
 150         /*
 151          * We would set IRQ_GPIO25 to be a wake-up IRQ, but
 152          * unfortunately something on the Neponset activates
 153          * this IRQ on sleep (ethernet?)
 154          */
 155 #if 0
 156         enable_irq_wake(IRQ_GPIO25);
 157 #endif
 158
 159         /*
 160          * Setup other Neponset IRQs.  SA1111 will be done by the
 161          * generic SA1111 code.
 162          */
 163         set_irq_handler(IRQ_NEPONSET_SMC9196, do_simple_IRQ);
 164         set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE);
 165         set_irq_handler(IRQ_NEPONSET_USAR, do_simple_IRQ);
 166         set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE);
 167
 168         /*
 169          * Disable GPIO 0/1 drivers so the buttons work on the module.
 170          */
 171         NCR_0 = NCR_GP01_OFF;
 172
 173         return 0;
 174 }
 175
 176 /*
 177  * LDM power management.
 178  */
 179 static int neponset_suspend(struct device *dev, u32 state, u32 level)
 180 {
 181         /*
 182          * Save state.
 183          */
 184         if (level == SUSPEND_SAVE_STATE ||
 185             level == SUSPEND_DISABLE ||
 186             level == SUSPEND_POWER_DOWN) {
 187                 if (!dev->saved_state)
 188                         dev->saved_state = kmalloc(sizeof(unsigned int), GFP_KERNEL);
 189                 if (!dev->saved_state)
 190                         return -ENOMEM;
 191
 192                 *(unsigned int *)dev->saved_state = NCR_0;
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int neponset_resume(struct device *dev, u32 level)
 199 {
 200         if (level == RESUME_RESTORE_STATE || level == RESUME_ENABLE) {
 201                 if (dev->saved_state) {
 202                         NCR_0 = *(unsigned int *)dev->saved_state;
 203                         kfree(dev->saved_state);
 204                         dev->saved_state = NULL;
 205                 }
 206         }
 207
 208         return 0;
 209 }
 210
 211 static struct device_driver neponset_device_driver = {
 212         .name           = "neponset",
 213         .bus            = &platform_bus_type,
 214         .probe          = neponset_probe,
 215         .suspend        = neponset_suspend,
 216         .resume         = neponset_resume,
 217 };
 218
 219 static struct resource neponset_resources[] = {
 220         [0] = {
 221                 .start  = 0x10000000,
 222                 .end    = 0x17ffffff,
 223                 .flags  = IORESOURCE_MEM,
 224         },
 225 };
 226
 227 static struct platform_device neponset_device = {
 228         .name           = "neponset",
 229         .id             = 0,
 230         .num_resources  = ARRAY_SIZE(neponset_resources),
 231         .resource       = neponset_resources,
 232 };
 233
 234 static struct resource sa1111_resources[] = {
 235         [0] = {
 236                 .start  = 0x40000000,
 237                 .end    = 0x40001fff,
 238                 .flags  = IORESOURCE_MEM,
 239         },
 240         [1] = {
 241                 .start  = IRQ_NEPONSET_SA1111,
 242                 .end    = IRQ_NEPONSET_SA1111,
 243                 .flags  = IORESOURCE_IRQ,
 244         },
 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         },
 256         .num_resources  = ARRAY_SIZE(sa1111_resources),
 257         .resource       = sa1111_resources,
 258 };
 259
 260 static struct resource smc91x_resources[] = {
 261         [0] = {
 262                 .start  = SA1100_CS3_PHYS,
 263                 .end    = SA1100_CS3_PHYS + 0x01ffffff,
 264                 .flags  = IORESOURCE_MEM,
 265         },
 266         [1] = {
 267                 .start  = IRQ_NEPONSET_SMC9196,
 268                 .end    = IRQ_NEPONSET_SMC9196,
 269                 .flags  = IORESOURCE_IRQ,
 270         },
 271         [2] = {
 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 static int __init neponset_init(void)
 292 {
 293         driver_register(&neponset_device_driver);
 294
 295         /*
 296          * The Neponset is only present on the Assabet machine type.
 297          */
 298         if (!machine_is_assabet())
 299                 return -ENODEV;
 300
 301         /*
 302          * Ensure that the memory bus request/grant signals are setup,
 303          * and the grant is held in its inactive state, whether or not
 304          * we actually have a Neponset attached.
 305          */
 306         sa1110_mb_disable();
 307
 308         if (!machine_has_neponset()) {
 309                 printk(KERN_DEBUG "Neponset expansion board not present\n");
 310                 return -ENODEV;
 311         }
 312
 313         if (WHOAMI != 0x11) {
 314                 printk(KERN_WARNING "Neponset board detected, but "
 315                         "wrong ID: %02x\n", WHOAMI);
 316                 return -ENODEV;
 317         }
 318
 319         return platform_add_devices(devices, ARRAY_SIZE(devices));
 320 }
 321
 322 subsys_initcall(neponset_init);
 323
 324 static struct map_desc neponset_io_desc[] __initdata = {
 325  /* virtual     physical    length type */
 326   { 0xf3000000, 0x10000000, SZ_1M, MT_DEVICE }, /* System Registers */
 327   { 0xf4000000, 0x40000000, SZ_1M, MT_DEVICE }  /* SA-1111 */
 328 };
 329
 330 void __init neponset_map_io(void)
 331 {
 332         iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc));
 333 }