1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/arm/mach-sa1100/neponset.c 4 */ 5 #include <linux/err.h> 6 #include <linux/gpio/driver.h> 7 #include <linux/gpio/gpio-reg.h> 8 #include <linux/gpio/machine.h> 9 #include <linux/init.h> 10 #include <linux/ioport.h> 11 #include <linux/irq.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm.h> 16 #include <linux/serial_core.h> 17 #include <linux/slab.h> 18 #include <linux/smc91x.h> 19 20 #include <asm/mach-types.h> 21 #include <asm/mach/map.h> 22 #include <asm/hardware/sa1111.h> 23 #include <linux/sizes.h> 24 25 #include <mach/hardware.h> 26 #include <mach/assabet.h> 27 #include <mach/neponset.h> 28 #include <mach/irqs.h> 29 30 #define NEP_IRQ_SMC91X 0 31 #define NEP_IRQ_USAR 1 32 #define NEP_IRQ_SA1111 2 33 #define NEP_IRQ_NR 3 34 35 #define WHOAMI 0x00 36 #define LEDS 0x10 37 #define SWPK 0x20 38 #define IRR 0x24 39 #define KP_Y_IN 0x80 40 #define KP_X_OUT 0x90 41 #define NCR_0 0xa0 42 #define MDM_CTL_0 0xb0 43 #define MDM_CTL_1 0xb4 44 #define AUD_CTL 0xc0 45 46 #define IRR_ETHERNET (1 << 0) 47 #define IRR_USAR (1 << 1) 48 #define IRR_SA1111 (1 << 2) 49 50 #define NCR_NGPIO 7 51 #define MDM_CTL0_NGPIO 4 52 #define MDM_CTL1_NGPIO 6 53 #define AUD_NGPIO 2 54 55 extern void sa1110_mb_disable(void); 56 57 #define to_neponset_gpio_chip(x) container_of(x, struct neponset_gpio_chip, gc) 58 59 static const char *neponset_ncr_names[] = { 60 "gp01_off", "tp_power", "ms_power", "enet_osc", 61 "spi_kb_wk_up", "a0vpp", "a1vpp" 62 }; 63 64 static const char *neponset_mdmctl0_names[] = { 65 "rts3", "dtr3", "rts1", "dtr1", 66 }; 67 68 static const char *neponset_mdmctl1_names[] = { 69 "cts3", "dsr3", "dcd3", "cts1", "dsr1", "dcd1" 70 }; 71 72 static const char *neponset_aud_names[] = { 73 "sel_1341", "mute_1341", 74 }; 75 76 struct neponset_drvdata { 77 void __iomem *base; 78 struct platform_device *sa1111; 79 struct platform_device *smc91x; 80 unsigned irq_base; 81 struct gpio_chip *gpio[4]; 82 }; 83 84 static struct gpiod_lookup_table neponset_uart1_gpio_table = { 85 .dev_id = "sa11x0-uart.1", 86 .table = { 87 GPIO_LOOKUP("neponset-mdm-ctl0", 2, "rts", GPIO_ACTIVE_LOW), 88 GPIO_LOOKUP("neponset-mdm-ctl0", 3, "dtr", GPIO_ACTIVE_LOW), 89 GPIO_LOOKUP("neponset-mdm-ctl1", 3, "cts", GPIO_ACTIVE_LOW), 90 GPIO_LOOKUP("neponset-mdm-ctl1", 4, "dsr", GPIO_ACTIVE_LOW), 91 GPIO_LOOKUP("neponset-mdm-ctl1", 5, "dcd", GPIO_ACTIVE_LOW), 92 { }, 93 }, 94 }; 95 96 static struct gpiod_lookup_table neponset_uart3_gpio_table = { 97 .dev_id = "sa11x0-uart.3", 98 .table = { 99 GPIO_LOOKUP("neponset-mdm-ctl0", 0, "rts", GPIO_ACTIVE_LOW), 100 GPIO_LOOKUP("neponset-mdm-ctl0", 1, "dtr", GPIO_ACTIVE_LOW), 101 GPIO_LOOKUP("neponset-mdm-ctl1", 0, "cts", GPIO_ACTIVE_LOW), 102 GPIO_LOOKUP("neponset-mdm-ctl1", 1, "dsr", GPIO_ACTIVE_LOW), 103 GPIO_LOOKUP("neponset-mdm-ctl1", 2, "dcd", GPIO_ACTIVE_LOW), 104 { }, 105 }, 106 }; 107 108 static struct gpiod_lookup_table neponset_pcmcia_table = { 109 .dev_id = "1800", 110 .table = { 111 GPIO_LOOKUP("sa1111", 1, "a0vcc", GPIO_ACTIVE_HIGH), 112 GPIO_LOOKUP("sa1111", 0, "a1vcc", GPIO_ACTIVE_HIGH), 113 GPIO_LOOKUP("neponset-ncr", 5, "a0vpp", GPIO_ACTIVE_HIGH), 114 GPIO_LOOKUP("neponset-ncr", 6, "a1vpp", GPIO_ACTIVE_HIGH), 115 GPIO_LOOKUP("sa1111", 2, "b0vcc", GPIO_ACTIVE_HIGH), 116 GPIO_LOOKUP("sa1111", 3, "b1vcc", GPIO_ACTIVE_HIGH), 117 { }, 118 }, 119 }; 120 121 static struct neponset_drvdata *nep; 122 123 void neponset_ncr_frob(unsigned int mask, unsigned int val) 124 { 125 struct neponset_drvdata *n = nep; 126 unsigned long m = mask, v = val; 127 128 if (nep) 129 n->gpio[0]->set_multiple(n->gpio[0], &m, &v); 130 else 131 WARN(1, "nep unset\n"); 132 } 133 EXPORT_SYMBOL(neponset_ncr_frob); 134 135 /* 136 * Install handler for Neponset IRQ. Note that we have to loop here 137 * since the ETHERNET and USAR IRQs are level based, and we need to 138 * ensure that the IRQ signal is deasserted before returning. This 139 * is rather unfortunate. 140 */ 141 static void neponset_irq_handler(struct irq_desc *desc) 142 { 143 struct neponset_drvdata *d = irq_desc_get_handler_data(desc); 144 unsigned int irr; 145 146 while (1) { 147 /* 148 * Acknowledge the parent IRQ. 149 */ 150 desc->irq_data.chip->irq_ack(&desc->irq_data); 151 152 /* 153 * Read the interrupt reason register. Let's have all 154 * active IRQ bits high. Note: there is a typo in the 155 * Neponset user's guide for the SA1111 IRR level. 156 */ 157 irr = readb_relaxed(d->base + IRR); 158 irr ^= IRR_ETHERNET | IRR_USAR; 159 160 if ((irr & (IRR_ETHERNET | IRR_USAR | IRR_SA1111)) == 0) 161 break; 162 163 /* 164 * Since there is no individual mask, we have to 165 * mask the parent IRQ. This is safe, since we'll 166 * recheck the register for any pending IRQs. 167 */ 168 if (irr & (IRR_ETHERNET | IRR_USAR)) { 169 desc->irq_data.chip->irq_mask(&desc->irq_data); 170 171 /* 172 * Ack the interrupt now to prevent re-entering 173 * this neponset handler. Again, this is safe 174 * since we'll check the IRR register prior to 175 * leaving. 176 */ 177 desc->irq_data.chip->irq_ack(&desc->irq_data); 178 179 if (irr & IRR_ETHERNET) 180 generic_handle_irq(d->irq_base + NEP_IRQ_SMC91X); 181 182 if (irr & IRR_USAR) 183 generic_handle_irq(d->irq_base + NEP_IRQ_USAR); 184 185 desc->irq_data.chip->irq_unmask(&desc->irq_data); 186 } 187 188 if (irr & IRR_SA1111) 189 generic_handle_irq(d->irq_base + NEP_IRQ_SA1111); 190 } 191 } 192 193 /* Yes, we really do not have any kind of masking or unmasking */ 194 static void nochip_noop(struct irq_data *irq) 195 { 196 } 197 198 static struct irq_chip nochip = { 199 .name = "neponset", 200 .irq_ack = nochip_noop, 201 .irq_mask = nochip_noop, 202 .irq_unmask = nochip_noop, 203 }; 204 205 static int neponset_init_gpio(struct gpio_chip **gcp, 206 struct device *dev, const char *label, void __iomem *reg, 207 unsigned num, bool in, const char *const * names) 208 { 209 struct gpio_chip *gc; 210 211 gc = gpio_reg_init(dev, reg, -1, num, label, in ? 0xffffffff : 0, 212 readl_relaxed(reg), names, NULL, NULL); 213 if (IS_ERR(gc)) 214 return PTR_ERR(gc); 215 216 *gcp = gc; 217 218 return 0; 219 } 220 221 static struct sa1111_platform_data sa1111_info = { 222 .disable_devs = SA1111_DEVID_PS2_MSE, 223 }; 224 225 static int neponset_probe(struct platform_device *dev) 226 { 227 struct neponset_drvdata *d; 228 struct resource *nep_res, *sa1111_res, *smc91x_res; 229 struct resource sa1111_resources[] = { 230 DEFINE_RES_MEM(0x40000000, SZ_8K), 231 { .flags = IORESOURCE_IRQ }, 232 }; 233 struct platform_device_info sa1111_devinfo = { 234 .parent = &dev->dev, 235 .name = "sa1111", 236 .id = 0, 237 .res = sa1111_resources, 238 .num_res = ARRAY_SIZE(sa1111_resources), 239 .data = &sa1111_info, 240 .size_data = sizeof(sa1111_info), 241 .dma_mask = 0xffffffffUL, 242 }; 243 struct resource smc91x_resources[] = { 244 DEFINE_RES_MEM_NAMED(SA1100_CS3_PHYS, 245 0x02000000, "smc91x-regs"), 246 DEFINE_RES_MEM_NAMED(SA1100_CS3_PHYS + 0x02000000, 247 0x02000000, "smc91x-attrib"), 248 { .flags = IORESOURCE_IRQ }, 249 }; 250 struct smc91x_platdata smc91x_platdata = { 251 .flags = SMC91X_USE_8BIT | SMC91X_IO_SHIFT_2 | SMC91X_NOWAIT, 252 }; 253 struct platform_device_info smc91x_devinfo = { 254 .parent = &dev->dev, 255 .name = "smc91x", 256 .id = 0, 257 .res = smc91x_resources, 258 .num_res = ARRAY_SIZE(smc91x_resources), 259 .data = &smc91x_platdata, 260 .size_data = sizeof(smc91x_platdata), 261 }; 262 int ret, irq; 263 264 if (nep) 265 return -EBUSY; 266 267 irq = ret = platform_get_irq(dev, 0); 268 if (ret < 0) 269 goto err_alloc; 270 271 nep_res = platform_get_resource(dev, IORESOURCE_MEM, 0); 272 smc91x_res = platform_get_resource(dev, IORESOURCE_MEM, 1); 273 sa1111_res = platform_get_resource(dev, IORESOURCE_MEM, 2); 274 if (!nep_res || !smc91x_res || !sa1111_res) { 275 ret = -ENXIO; 276 goto err_alloc; 277 } 278 279 d = kzalloc(sizeof(*d), GFP_KERNEL); 280 if (!d) { 281 ret = -ENOMEM; 282 goto err_alloc; 283 } 284 285 d->base = ioremap(nep_res->start, SZ_4K); 286 if (!d->base) { 287 ret = -ENOMEM; 288 goto err_ioremap; 289 } 290 291 if (readb_relaxed(d->base + WHOAMI) != 0x11) { 292 dev_warn(&dev->dev, "Neponset board detected, but wrong ID: %02x\n", 293 readb_relaxed(d->base + WHOAMI)); 294 ret = -ENODEV; 295 goto err_id; 296 } 297 298 ret = irq_alloc_descs(-1, IRQ_BOARD_START, NEP_IRQ_NR, -1); 299 if (ret <= 0) { 300 dev_err(&dev->dev, "unable to allocate %u irqs: %d\n", 301 NEP_IRQ_NR, ret); 302 if (ret == 0) 303 ret = -ENOMEM; 304 goto err_irq_alloc; 305 } 306 307 d->irq_base = ret; 308 309 irq_set_chip_and_handler(d->irq_base + NEP_IRQ_SMC91X, &nochip, 310 handle_simple_irq); 311 irq_clear_status_flags(d->irq_base + NEP_IRQ_SMC91X, IRQ_NOREQUEST | IRQ_NOPROBE); 312 irq_set_chip_and_handler(d->irq_base + NEP_IRQ_USAR, &nochip, 313 handle_simple_irq); 314 irq_clear_status_flags(d->irq_base + NEP_IRQ_USAR, IRQ_NOREQUEST | IRQ_NOPROBE); 315 irq_set_chip(d->irq_base + NEP_IRQ_SA1111, &nochip); 316 317 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING); 318 irq_set_chained_handler_and_data(irq, neponset_irq_handler, d); 319 320 /* Disable GPIO 0/1 drivers so the buttons work on the Assabet */ 321 writeb_relaxed(NCR_GP01_OFF, d->base + NCR_0); 322 323 neponset_init_gpio(&d->gpio[0], &dev->dev, "neponset-ncr", 324 d->base + NCR_0, NCR_NGPIO, false, 325 neponset_ncr_names); 326 neponset_init_gpio(&d->gpio[1], &dev->dev, "neponset-mdm-ctl0", 327 d->base + MDM_CTL_0, MDM_CTL0_NGPIO, false, 328 neponset_mdmctl0_names); 329 neponset_init_gpio(&d->gpio[2], &dev->dev, "neponset-mdm-ctl1", 330 d->base + MDM_CTL_1, MDM_CTL1_NGPIO, true, 331 neponset_mdmctl1_names); 332 neponset_init_gpio(&d->gpio[3], &dev->dev, "neponset-aud-ctl", 333 d->base + AUD_CTL, AUD_NGPIO, false, 334 neponset_aud_names); 335 336 gpiod_add_lookup_table(&neponset_uart1_gpio_table); 337 gpiod_add_lookup_table(&neponset_uart3_gpio_table); 338 gpiod_add_lookup_table(&neponset_pcmcia_table); 339 340 /* 341 * We would set IRQ_GPIO25 to be a wake-up IRQ, but unfortunately 342 * something on the Neponset activates this IRQ on sleep (eth?) 343 */ 344 #if 0 345 enable_irq_wake(irq); 346 #endif 347 348 dev_info(&dev->dev, "Neponset daughter board, providing IRQ%u-%u\n", 349 d->irq_base, d->irq_base + NEP_IRQ_NR - 1); 350 nep = d; 351 352 /* Ensure that the memory bus request/grant signals are setup */ 353 sa1110_mb_disable(); 354 355 sa1111_resources[0].parent = sa1111_res; 356 sa1111_resources[1].start = d->irq_base + NEP_IRQ_SA1111; 357 sa1111_resources[1].end = d->irq_base + NEP_IRQ_SA1111; 358 d->sa1111 = platform_device_register_full(&sa1111_devinfo); 359 360 smc91x_resources[0].parent = smc91x_res; 361 smc91x_resources[1].parent = smc91x_res; 362 smc91x_resources[2].start = d->irq_base + NEP_IRQ_SMC91X; 363 smc91x_resources[2].end = d->irq_base + NEP_IRQ_SMC91X; 364 d->smc91x = platform_device_register_full(&smc91x_devinfo); 365 366 platform_set_drvdata(dev, d); 367 368 return 0; 369 370 err_irq_alloc: 371 err_id: 372 iounmap(d->base); 373 err_ioremap: 374 kfree(d); 375 err_alloc: 376 return ret; 377 } 378 379 static int neponset_remove(struct platform_device *dev) 380 { 381 struct neponset_drvdata *d = platform_get_drvdata(dev); 382 int irq = platform_get_irq(dev, 0); 383 384 if (!IS_ERR(d->sa1111)) 385 platform_device_unregister(d->sa1111); 386 if (!IS_ERR(d->smc91x)) 387 platform_device_unregister(d->smc91x); 388 389 gpiod_remove_lookup_table(&neponset_pcmcia_table); 390 gpiod_remove_lookup_table(&neponset_uart3_gpio_table); 391 gpiod_remove_lookup_table(&neponset_uart1_gpio_table); 392 393 irq_set_chained_handler(irq, NULL); 394 irq_free_descs(d->irq_base, NEP_IRQ_NR); 395 nep = NULL; 396 iounmap(d->base); 397 kfree(d); 398 399 return 0; 400 } 401 402 #ifdef CONFIG_PM_SLEEP 403 static int neponset_resume(struct device *dev) 404 { 405 struct neponset_drvdata *d = dev_get_drvdata(dev); 406 int i, ret = 0; 407 408 for (i = 0; i < ARRAY_SIZE(d->gpio); i++) { 409 ret = gpio_reg_resume(d->gpio[i]); 410 if (ret) 411 break; 412 } 413 414 return ret; 415 } 416 417 static const struct dev_pm_ops neponset_pm_ops = { 418 .resume_noirq = neponset_resume, 419 .restore_noirq = neponset_resume, 420 }; 421 #define PM_OPS &neponset_pm_ops 422 #else 423 #define PM_OPS NULL 424 #endif 425 426 static struct platform_driver neponset_device_driver = { 427 .probe = neponset_probe, 428 .remove = neponset_remove, 429 .driver = { 430 .name = "neponset", 431 .pm = PM_OPS, 432 }, 433 }; 434 435 static int __init neponset_init(void) 436 { 437 return platform_driver_register(&neponset_device_driver); 438 } 439 440 subsys_initcall(neponset_init); 441