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