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/platform_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 desc_handle_irq(IRQ_NEPONSET_SMC9196, d, regs); 65 } 66 67 if (irr & IRR_USAR) { 68 d = irq_desc + IRQ_NEPONSET_USAR; 69 desc_handle_irq(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 desc_handle_irq(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 #ifdef CONFIG_PM 177 178 /* 179 * LDM power management. 180 */ 181 static int neponset_suspend(struct device *dev, pm_message_t state) 182 { 183 /* 184 * Save state. 185 */ 186 if (!dev->power.saved_state) 187 dev->power.saved_state = kmalloc(sizeof(unsigned int), GFP_KERNEL); 188 if (!dev->power.saved_state) 189 return -ENOMEM; 190 191 *(unsigned int *)dev->power.saved_state = NCR_0; 192 193 return 0; 194 } 195 196 static int neponset_resume(struct device *dev) 197 { 198 if (dev->power.saved_state) { 199 NCR_0 = *(unsigned int *)dev->power.saved_state; 200 kfree(dev->power.saved_state); 201 dev->power.saved_state = NULL; 202 } 203 204 return 0; 205 } 206 207 #else 208 #define neponset_suspend NULL 209 #define neponset_resume NULL 210 #endif 211 212 static struct device_driver neponset_device_driver = { 213 .name = "neponset", 214 .bus = &platform_bus_type, 215 .probe = neponset_probe, 216 .suspend = neponset_suspend, 217 .resume = neponset_resume, 218 }; 219 220 static struct resource neponset_resources[] = { 221 [0] = { 222 .start = 0x10000000, 223 .end = 0x17ffffff, 224 .flags = IORESOURCE_MEM, 225 }, 226 }; 227 228 static struct platform_device neponset_device = { 229 .name = "neponset", 230 .id = 0, 231 .num_resources = ARRAY_SIZE(neponset_resources), 232 .resource = neponset_resources, 233 }; 234 235 static struct resource sa1111_resources[] = { 236 [0] = { 237 .start = 0x40000000, 238 .end = 0x40001fff, 239 .flags = IORESOURCE_MEM, 240 }, 241 [1] = { 242 .start = IRQ_NEPONSET_SA1111, 243 .end = IRQ_NEPONSET_SA1111, 244 .flags = IORESOURCE_IRQ, 245 }, 246 }; 247 248 static u64 sa1111_dmamask = 0xffffffffUL; 249 250 static struct platform_device sa1111_device = { 251 .name = "sa1111", 252 .id = 0, 253 .dev = { 254 .dma_mask = &sa1111_dmamask, 255 .coherent_dma_mask = 0xffffffff, 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 static int __init neponset_init(void) 295 { 296 driver_register(&neponset_device_driver); 297 298 /* 299 * The Neponset is only present on the Assabet machine type. 300 */ 301 if (!machine_is_assabet()) 302 return -ENODEV; 303 304 /* 305 * Ensure that the memory bus request/grant signals are setup, 306 * and the grant is held in its inactive state, whether or not 307 * we actually have a Neponset attached. 308 */ 309 sa1110_mb_disable(); 310 311 if (!machine_has_neponset()) { 312 printk(KERN_DEBUG "Neponset expansion board not present\n"); 313 return -ENODEV; 314 } 315 316 if (WHOAMI != 0x11) { 317 printk(KERN_WARNING "Neponset board detected, but " 318 "wrong ID: %02x\n", WHOAMI); 319 return -ENODEV; 320 } 321 322 return platform_add_devices(devices, ARRAY_SIZE(devices)); 323 } 324 325 subsys_initcall(neponset_init); 326 327 static struct map_desc neponset_io_desc[] __initdata = { 328 { /* System Registers */ 329 .virtual = 0xf3000000, 330 .pfn = __phys_to_pfn(0x10000000), 331 .length = SZ_1M, 332 .type = MT_DEVICE 333 }, { /* SA-1111 */ 334 .virtual = 0xf4000000, 335 .pfn = __phys_to_pfn(0x40000000), 336 .length = SZ_1M, 337 .type = MT_DEVICE 338 } 339 }; 340 341 void __init neponset_map_io(void) 342 { 343 iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc)); 344 } 345