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 platform_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 platform_device *dev, pm_message_t state) 182 { 183 /* 184 * Save state. 185 */ 186 if (!dev->dev.power.saved_state) 187 dev->dev.power.saved_state = kmalloc(sizeof(unsigned int), GFP_KERNEL); 188 if (!dev->dev.power.saved_state) 189 return -ENOMEM; 190 191 *(unsigned int *)dev->dev.power.saved_state = NCR_0; 192 193 return 0; 194 } 195 196 static int neponset_resume(struct platform_device *dev) 197 { 198 if (dev->dev.power.saved_state) { 199 NCR_0 = *(unsigned int *)dev->dev.power.saved_state; 200 kfree(dev->dev.power.saved_state); 201 dev->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 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 static int __init neponset_init(void) 296 { 297 platform_driver_register(&neponset_device_driver); 298 299 /* 300 * The Neponset is only present on the Assabet machine type. 301 */ 302 if (!machine_is_assabet()) 303 return -ENODEV; 304 305 /* 306 * Ensure that the memory bus request/grant signals are setup, 307 * and the grant is held in its inactive state, whether or not 308 * we actually have a Neponset attached. 309 */ 310 sa1110_mb_disable(); 311 312 if (!machine_has_neponset()) { 313 printk(KERN_DEBUG "Neponset expansion board not present\n"); 314 return -ENODEV; 315 } 316 317 if (WHOAMI != 0x11) { 318 printk(KERN_WARNING "Neponset board detected, but " 319 "wrong ID: %02x\n", WHOAMI); 320 return -ENODEV; 321 } 322 323 return platform_add_devices(devices, ARRAY_SIZE(devices)); 324 } 325 326 subsys_initcall(neponset_init); 327 328 static struct map_desc neponset_io_desc[] __initdata = { 329 { /* System Registers */ 330 .virtual = 0xf3000000, 331 .pfn = __phys_to_pfn(0x10000000), 332 .length = SZ_1M, 333 .type = MT_DEVICE 334 }, { /* SA-1111 */ 335 .virtual = 0xf4000000, 336 .pfn = __phys_to_pfn(0x40000000), 337 .length = SZ_1M, 338 .type = MT_DEVICE 339 } 340 }; 341 342 void __init neponset_map_io(void) 343 { 344 iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc)); 345 } 346