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 12 #include <mach/hardware.h> 13 #include <asm/mach-types.h> 14 #include <asm/irq.h> 15 #include <asm/mach/map.h> 16 #include <asm/mach/irq.h> 17 #include <asm/mach/serial_sa1100.h> 18 #include <mach/assabet.h> 19 #include <mach/neponset.h> 20 #include <asm/hardware/sa1111.h> 21 #include <asm/sizes.h> 22 23 /* 24 * Install handler for Neponset IRQ. Note that we have to loop here 25 * since the ETHERNET and USAR IRQs are level based, and we need to 26 * ensure that the IRQ signal is deasserted before returning. This 27 * is rather unfortunate. 28 */ 29 static void 30 neponset_irq_handler(unsigned int irq, struct irq_desc *desc) 31 { 32 unsigned int irr; 33 34 while (1) { 35 /* 36 * Acknowledge the parent IRQ. 37 */ 38 desc->irq_data.chip->irq_ack(&desc->irq_data); 39 40 /* 41 * Read the interrupt reason register. Let's have all 42 * active IRQ bits high. Note: there is a typo in the 43 * Neponset user's guide for the SA1111 IRR level. 44 */ 45 irr = IRR ^ (IRR_ETHERNET | IRR_USAR); 46 47 if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0) 48 break; 49 50 /* 51 * Since there is no individual mask, we have to 52 * mask the parent IRQ. This is safe, since we'll 53 * recheck the register for any pending IRQs. 54 */ 55 if (irr & (IRR_ETHERNET | IRR_USAR)) { 56 desc->irq_data.chip->irq_mask(&desc->irq_data); 57 58 /* 59 * Ack the interrupt now to prevent re-entering 60 * this neponset handler. Again, this is safe 61 * since we'll check the IRR register prior to 62 * leaving. 63 */ 64 desc->irq_data.chip->irq_ack(&desc->irq_data); 65 66 if (irr & IRR_ETHERNET) { 67 generic_handle_irq(IRQ_NEPONSET_SMC9196); 68 } 69 70 if (irr & IRR_USAR) { 71 generic_handle_irq(IRQ_NEPONSET_USAR); 72 } 73 74 desc->irq_data.chip->irq_unmask(&desc->irq_data); 75 } 76 77 if (irr & IRR_SA1111) { 78 generic_handle_irq(IRQ_NEPONSET_SA1111); 79 } 80 } 81 } 82 83 static void neponset_set_mctrl(struct uart_port *port, u_int mctrl) 84 { 85 u_int mdm_ctl0 = MDM_CTL_0; 86 87 if (port->mapbase == _Ser1UTCR0) { 88 if (mctrl & TIOCM_RTS) 89 mdm_ctl0 &= ~MDM_CTL0_RTS2; 90 else 91 mdm_ctl0 |= MDM_CTL0_RTS2; 92 93 if (mctrl & TIOCM_DTR) 94 mdm_ctl0 &= ~MDM_CTL0_DTR2; 95 else 96 mdm_ctl0 |= MDM_CTL0_DTR2; 97 } else if (port->mapbase == _Ser3UTCR0) { 98 if (mctrl & TIOCM_RTS) 99 mdm_ctl0 &= ~MDM_CTL0_RTS1; 100 else 101 mdm_ctl0 |= MDM_CTL0_RTS1; 102 103 if (mctrl & TIOCM_DTR) 104 mdm_ctl0 &= ~MDM_CTL0_DTR1; 105 else 106 mdm_ctl0 |= MDM_CTL0_DTR1; 107 } 108 109 MDM_CTL_0 = mdm_ctl0; 110 } 111 112 static u_int neponset_get_mctrl(struct uart_port *port) 113 { 114 u_int ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR; 115 u_int mdm_ctl1 = MDM_CTL_1; 116 117 if (port->mapbase == _Ser1UTCR0) { 118 if (mdm_ctl1 & MDM_CTL1_DCD2) 119 ret &= ~TIOCM_CD; 120 if (mdm_ctl1 & MDM_CTL1_CTS2) 121 ret &= ~TIOCM_CTS; 122 if (mdm_ctl1 & MDM_CTL1_DSR2) 123 ret &= ~TIOCM_DSR; 124 } else if (port->mapbase == _Ser3UTCR0) { 125 if (mdm_ctl1 & MDM_CTL1_DCD1) 126 ret &= ~TIOCM_CD; 127 if (mdm_ctl1 & MDM_CTL1_CTS1) 128 ret &= ~TIOCM_CTS; 129 if (mdm_ctl1 & MDM_CTL1_DSR1) 130 ret &= ~TIOCM_DSR; 131 } 132 133 return ret; 134 } 135 136 static struct sa1100_port_fns neponset_port_fns __devinitdata = { 137 .set_mctrl = neponset_set_mctrl, 138 .get_mctrl = neponset_get_mctrl, 139 }; 140 141 static int __devinit neponset_probe(struct platform_device *dev) 142 { 143 sa1100_register_uart_fns(&neponset_port_fns); 144 145 /* 146 * Install handler for GPIO25. 147 */ 148 irq_set_irq_type(IRQ_GPIO25, IRQ_TYPE_EDGE_RISING); 149 irq_set_chained_handler(IRQ_GPIO25, neponset_irq_handler); 150 151 /* 152 * We would set IRQ_GPIO25 to be a wake-up IRQ, but 153 * unfortunately something on the Neponset activates 154 * this IRQ on sleep (ethernet?) 155 */ 156 #if 0 157 enable_irq_wake(IRQ_GPIO25); 158 #endif 159 160 /* 161 * Setup other Neponset IRQs. SA1111 will be done by the 162 * generic SA1111 code. 163 */ 164 irq_set_handler(IRQ_NEPONSET_SMC9196, handle_simple_irq); 165 set_irq_flags(IRQ_NEPONSET_SMC9196, IRQF_VALID | IRQF_PROBE); 166 irq_set_handler(IRQ_NEPONSET_USAR, handle_simple_irq); 167 set_irq_flags(IRQ_NEPONSET_USAR, IRQF_VALID | IRQF_PROBE); 168 169 /* 170 * Disable GPIO 0/1 drivers so the buttons work on the module. 171 */ 172 NCR_0 = NCR_GP01_OFF; 173 174 return 0; 175 } 176 177 #ifdef CONFIG_PM 178 179 /* 180 * LDM power management. 181 */ 182 static unsigned int neponset_saved_state; 183 184 static int neponset_suspend(struct platform_device *dev, pm_message_t state) 185 { 186 /* 187 * Save state. 188 */ 189 neponset_saved_state = NCR_0; 190 191 return 0; 192 } 193 194 static int neponset_resume(struct platform_device *dev) 195 { 196 NCR_0 = neponset_saved_state; 197 198 return 0; 199 } 200 201 #else 202 #define neponset_suspend NULL 203 #define neponset_resume NULL 204 #endif 205 206 static struct platform_driver neponset_device_driver = { 207 .probe = neponset_probe, 208 .suspend = neponset_suspend, 209 .resume = neponset_resume, 210 .driver = { 211 .name = "neponset", 212 }, 213 }; 214 215 static struct resource neponset_resources[] = { 216 [0] = { 217 .start = 0x10000000, 218 .end = 0x17ffffff, 219 .flags = IORESOURCE_MEM, 220 }, 221 }; 222 223 static struct platform_device neponset_device = { 224 .name = "neponset", 225 .id = 0, 226 .num_resources = ARRAY_SIZE(neponset_resources), 227 .resource = neponset_resources, 228 }; 229 230 static struct resource sa1111_resources[] = { 231 [0] = { 232 .start = 0x40000000, 233 .end = 0x40001fff, 234 .flags = IORESOURCE_MEM, 235 }, 236 [1] = { 237 .start = IRQ_NEPONSET_SA1111, 238 .end = IRQ_NEPONSET_SA1111, 239 .flags = IORESOURCE_IRQ, 240 }, 241 }; 242 243 static struct sa1111_platform_data sa1111_info = { 244 .irq_base = IRQ_BOARD_END, 245 .disable_devs = SA1111_DEVID_PS2_MSE, 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 .platform_data = &sa1111_info, 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 } 337 }; 338 339 void __init neponset_map_io(void) 340 { 341 iotable_init(neponset_io_desc, ARRAY_SIZE(neponset_io_desc)); 342 } 343