Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 1 | /* linux/drivers/parport/parport_ax88796.c |
| 2 | * |
| 3 | * (c) 2005,2006 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/parport.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/platform_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 19 | |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/irq.h> |
| 22 | |
| 23 | #define AX_SPR_BUSY (1<<7) |
| 24 | #define AX_SPR_ACK (1<<6) |
| 25 | #define AX_SPR_PE (1<<5) |
| 26 | #define AX_SPR_SLCT (1<<4) |
| 27 | #define AX_SPR_ERR (1<<3) |
| 28 | |
| 29 | #define AX_CPR_nDOE (1<<5) |
| 30 | #define AX_CPR_SLCTIN (1<<3) |
| 31 | #define AX_CPR_nINIT (1<<2) |
| 32 | #define AX_CPR_ATFD (1<<1) |
| 33 | #define AX_CPR_STRB (1<<0) |
| 34 | |
| 35 | struct ax_drvdata { |
| 36 | struct parport *parport; |
| 37 | struct parport_state suspend; |
| 38 | |
| 39 | struct device *dev; |
| 40 | struct resource *io; |
| 41 | |
| 42 | unsigned char irq_enabled; |
| 43 | |
| 44 | void __iomem *base; |
| 45 | void __iomem *spp_data; |
| 46 | void __iomem *spp_spr; |
| 47 | void __iomem *spp_cpr; |
| 48 | }; |
| 49 | |
| 50 | static inline struct ax_drvdata *pp_to_drv(struct parport *p) |
| 51 | { |
| 52 | return p->private_data; |
| 53 | } |
| 54 | |
| 55 | static unsigned char |
| 56 | parport_ax88796_read_data(struct parport *p) |
| 57 | { |
| 58 | struct ax_drvdata *dd = pp_to_drv(p); |
| 59 | |
| 60 | return readb(dd->spp_data); |
| 61 | } |
| 62 | |
| 63 | static void |
| 64 | parport_ax88796_write_data(struct parport *p, unsigned char data) |
| 65 | { |
| 66 | struct ax_drvdata *dd = pp_to_drv(p); |
| 67 | |
| 68 | writeb(data, dd->spp_data); |
| 69 | } |
| 70 | |
| 71 | static unsigned char |
| 72 | parport_ax88796_read_control(struct parport *p) |
| 73 | { |
| 74 | struct ax_drvdata *dd = pp_to_drv(p); |
| 75 | unsigned int cpr = readb(dd->spp_cpr); |
| 76 | unsigned int ret = 0; |
| 77 | |
| 78 | if (!(cpr & AX_CPR_STRB)) |
| 79 | ret |= PARPORT_CONTROL_STROBE; |
| 80 | |
| 81 | if (!(cpr & AX_CPR_ATFD)) |
| 82 | ret |= PARPORT_CONTROL_AUTOFD; |
| 83 | |
| 84 | if (cpr & AX_CPR_nINIT) |
| 85 | ret |= PARPORT_CONTROL_INIT; |
| 86 | |
| 87 | if (!(cpr & AX_CPR_SLCTIN)) |
| 88 | ret |= PARPORT_CONTROL_SELECT; |
| 89 | |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | static void |
| 94 | parport_ax88796_write_control(struct parport *p, unsigned char control) |
| 95 | { |
| 96 | struct ax_drvdata *dd = pp_to_drv(p); |
| 97 | unsigned int cpr = readb(dd->spp_cpr); |
| 98 | |
| 99 | cpr &= AX_CPR_nDOE; |
| 100 | |
| 101 | if (!(control & PARPORT_CONTROL_STROBE)) |
| 102 | cpr |= AX_CPR_STRB; |
| 103 | |
| 104 | if (!(control & PARPORT_CONTROL_AUTOFD)) |
| 105 | cpr |= AX_CPR_ATFD; |
| 106 | |
| 107 | if (control & PARPORT_CONTROL_INIT) |
| 108 | cpr |= AX_CPR_nINIT; |
| 109 | |
| 110 | if (!(control & PARPORT_CONTROL_SELECT)) |
| 111 | cpr |= AX_CPR_SLCTIN; |
| 112 | |
| 113 | dev_dbg(dd->dev, "write_control: ctrl=%02x, cpr=%02x\n", control, cpr); |
| 114 | writeb(cpr, dd->spp_cpr); |
| 115 | |
| 116 | if (parport_ax88796_read_control(p) != control) { |
| 117 | dev_err(dd->dev, "write_control: read != set (%02x, %02x)\n", |
| 118 | parport_ax88796_read_control(p), control); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static unsigned char |
| 123 | parport_ax88796_read_status(struct parport *p) |
| 124 | { |
| 125 | struct ax_drvdata *dd = pp_to_drv(p); |
| 126 | unsigned int status = readb(dd->spp_spr); |
| 127 | unsigned int ret = 0; |
| 128 | |
| 129 | if (status & AX_SPR_BUSY) |
| 130 | ret |= PARPORT_STATUS_BUSY; |
| 131 | |
| 132 | if (status & AX_SPR_ACK) |
| 133 | ret |= PARPORT_STATUS_ACK; |
| 134 | |
| 135 | if (status & AX_SPR_ERR) |
| 136 | ret |= PARPORT_STATUS_ERROR; |
| 137 | |
| 138 | if (status & AX_SPR_SLCT) |
| 139 | ret |= PARPORT_STATUS_SELECT; |
| 140 | |
| 141 | if (status & AX_SPR_PE) |
| 142 | ret |= PARPORT_STATUS_PAPEROUT; |
| 143 | |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | static unsigned char |
| 148 | parport_ax88796_frob_control(struct parport *p, unsigned char mask, |
| 149 | unsigned char val) |
| 150 | { |
| 151 | struct ax_drvdata *dd = pp_to_drv(p); |
| 152 | unsigned char old = parport_ax88796_read_control(p); |
| 153 | |
| 154 | dev_dbg(dd->dev, "frob: mask=%02x, val=%02x, old=%02x\n", |
| 155 | mask, val, old); |
| 156 | |
| 157 | parport_ax88796_write_control(p, (old & ~mask) | val); |
| 158 | return old; |
| 159 | } |
| 160 | |
| 161 | static void |
| 162 | parport_ax88796_enable_irq(struct parport *p) |
| 163 | { |
| 164 | struct ax_drvdata *dd = pp_to_drv(p); |
| 165 | unsigned long flags; |
| 166 | |
| 167 | local_irq_save(flags); |
| 168 | if (!dd->irq_enabled) { |
| 169 | enable_irq(p->irq); |
| 170 | dd->irq_enabled = 1; |
| 171 | } |
| 172 | local_irq_restore(flags); |
| 173 | } |
| 174 | |
| 175 | static void |
| 176 | parport_ax88796_disable_irq(struct parport *p) |
| 177 | { |
| 178 | struct ax_drvdata *dd = pp_to_drv(p); |
| 179 | unsigned long flags; |
| 180 | |
| 181 | local_irq_save(flags); |
| 182 | if (dd->irq_enabled) { |
| 183 | disable_irq(p->irq); |
| 184 | dd->irq_enabled = 0; |
| 185 | } |
| 186 | local_irq_restore(flags); |
| 187 | } |
| 188 | |
| 189 | static void |
| 190 | parport_ax88796_data_forward(struct parport *p) |
| 191 | { |
| 192 | struct ax_drvdata *dd = pp_to_drv(p); |
| 193 | void __iomem *cpr = dd->spp_cpr; |
| 194 | |
| 195 | writeb((readb(cpr) & ~AX_CPR_nDOE), cpr); |
| 196 | } |
| 197 | |
| 198 | static void |
| 199 | parport_ax88796_data_reverse(struct parport *p) |
| 200 | { |
| 201 | struct ax_drvdata *dd = pp_to_drv(p); |
| 202 | void __iomem *cpr = dd->spp_cpr; |
| 203 | |
| 204 | writeb(readb(cpr) | AX_CPR_nDOE, cpr); |
| 205 | } |
| 206 | |
| 207 | static void |
| 208 | parport_ax88796_init_state(struct pardevice *d, struct parport_state *s) |
| 209 | { |
| 210 | struct ax_drvdata *dd = pp_to_drv(d->port); |
| 211 | |
| 212 | memset(s, 0, sizeof(struct parport_state)); |
| 213 | |
| 214 | dev_dbg(dd->dev, "init_state: %p: state=%p\n", d, s); |
| 215 | s->u.ax88796.cpr = readb(dd->spp_cpr); |
| 216 | } |
| 217 | |
| 218 | static void |
| 219 | parport_ax88796_save_state(struct parport *p, struct parport_state *s) |
| 220 | { |
| 221 | struct ax_drvdata *dd = pp_to_drv(p); |
| 222 | |
| 223 | dev_dbg(dd->dev, "save_state: %p: state=%p\n", p, s); |
| 224 | s->u.ax88796.cpr = readb(dd->spp_cpr); |
| 225 | } |
| 226 | |
| 227 | static void |
| 228 | parport_ax88796_restore_state(struct parport *p, struct parport_state *s) |
| 229 | { |
| 230 | struct ax_drvdata *dd = pp_to_drv(p); |
| 231 | |
| 232 | dev_dbg(dd->dev, "restore_state: %p: state=%p\n", p, s); |
| 233 | writeb(s->u.ax88796.cpr, dd->spp_cpr); |
| 234 | } |
| 235 | |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 236 | static struct parport_operations parport_ax88796_ops = { |
| 237 | .write_data = parport_ax88796_write_data, |
| 238 | .read_data = parport_ax88796_read_data, |
| 239 | |
| 240 | .write_control = parport_ax88796_write_control, |
| 241 | .read_control = parport_ax88796_read_control, |
| 242 | .frob_control = parport_ax88796_frob_control, |
| 243 | |
| 244 | .read_status = parport_ax88796_read_status, |
| 245 | |
| 246 | .enable_irq = parport_ax88796_enable_irq, |
| 247 | .disable_irq = parport_ax88796_disable_irq, |
| 248 | |
| 249 | .data_forward = parport_ax88796_data_forward, |
| 250 | .data_reverse = parport_ax88796_data_reverse, |
| 251 | |
| 252 | .init_state = parport_ax88796_init_state, |
| 253 | .save_state = parport_ax88796_save_state, |
| 254 | .restore_state = parport_ax88796_restore_state, |
| 255 | |
| 256 | .epp_write_data = parport_ieee1284_epp_write_data, |
| 257 | .epp_read_data = parport_ieee1284_epp_read_data, |
| 258 | .epp_write_addr = parport_ieee1284_epp_write_addr, |
| 259 | .epp_read_addr = parport_ieee1284_epp_read_addr, |
| 260 | |
| 261 | .ecp_write_data = parport_ieee1284_ecp_write_data, |
| 262 | .ecp_read_data = parport_ieee1284_ecp_read_data, |
| 263 | .ecp_write_addr = parport_ieee1284_ecp_write_addr, |
| 264 | |
| 265 | .compat_write_data = parport_ieee1284_write_compat, |
| 266 | .nibble_read_data = parport_ieee1284_read_nibble, |
| 267 | .byte_read_data = parport_ieee1284_read_byte, |
| 268 | |
| 269 | .owner = THIS_MODULE, |
| 270 | }; |
| 271 | |
| 272 | static int parport_ax88796_probe(struct platform_device *pdev) |
| 273 | { |
| 274 | struct device *_dev = &pdev->dev; |
| 275 | struct ax_drvdata *dd; |
| 276 | struct parport *pp = NULL; |
| 277 | struct resource *res; |
| 278 | unsigned long size; |
| 279 | int spacing; |
| 280 | int irq; |
| 281 | int ret; |
| 282 | |
| 283 | dd = kzalloc(sizeof(struct ax_drvdata), GFP_KERNEL); |
| 284 | if (dd == NULL) { |
| 285 | dev_err(_dev, "no memory for private data\n"); |
| 286 | return -ENOMEM; |
| 287 | } |
| 288 | |
| 289 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 290 | if (res == NULL) { |
| 291 | dev_err(_dev, "no MEM specified\n"); |
| 292 | ret = -ENXIO; |
| 293 | goto exit_mem; |
| 294 | } |
| 295 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 296 | size = resource_size(res); |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 297 | spacing = size / 3; |
| 298 | |
| 299 | dd->io = request_mem_region(res->start, size, pdev->name); |
| 300 | if (dd->io == NULL) { |
| 301 | dev_err(_dev, "cannot reserve memory\n"); |
| 302 | ret = -ENXIO; |
| 303 | goto exit_mem; |
| 304 | } |
| 305 | |
| 306 | dd->base = ioremap(res->start, size); |
| 307 | if (dd->base == NULL) { |
| 308 | dev_err(_dev, "cannot ioremap region\n"); |
| 309 | ret = -ENXIO; |
| 310 | goto exit_res; |
| 311 | } |
| 312 | |
| 313 | irq = platform_get_irq(pdev, 0); |
| 314 | if (irq <= 0) |
| 315 | irq = PARPORT_IRQ_NONE; |
| 316 | |
| 317 | pp = parport_register_port((unsigned long)dd->base, irq, |
| 318 | PARPORT_DMA_NONE, |
| 319 | &parport_ax88796_ops); |
| 320 | |
| 321 | if (pp == NULL) { |
| 322 | dev_err(_dev, "failed to register parallel port\n"); |
| 323 | ret = -ENOMEM; |
| 324 | goto exit_unmap; |
| 325 | } |
| 326 | |
| 327 | pp->private_data = dd; |
| 328 | dd->parport = pp; |
| 329 | dd->dev = _dev; |
| 330 | |
| 331 | dd->spp_data = dd->base; |
| 332 | dd->spp_spr = dd->base + (spacing * 1); |
| 333 | dd->spp_cpr = dd->base + (spacing * 2); |
| 334 | |
| 335 | /* initialise the port controls */ |
| 336 | writeb(AX_CPR_STRB, dd->spp_cpr); |
| 337 | |
| 338 | if (irq >= 0) { |
| 339 | /* request irq */ |
Jeff Garzik | 3f2e40d | 2007-10-19 01:42:14 -0400 | [diff] [blame] | 340 | ret = request_irq(irq, parport_irq_handler, |
Thomas Gleixner | dace145 | 2006-07-01 19:29:38 -0700 | [diff] [blame] | 341 | IRQF_TRIGGER_FALLING, pdev->name, pp); |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 342 | |
| 343 | if (ret < 0) |
| 344 | goto exit_port; |
| 345 | |
| 346 | dd->irq_enabled = 1; |
| 347 | } |
| 348 | |
| 349 | platform_set_drvdata(pdev, pp); |
| 350 | |
| 351 | dev_info(_dev, "attached parallel port driver\n"); |
| 352 | parport_announce_port(pp); |
| 353 | |
| 354 | return 0; |
| 355 | |
| 356 | exit_port: |
| 357 | parport_remove_port(pp); |
| 358 | exit_unmap: |
| 359 | iounmap(dd->base); |
| 360 | exit_res: |
Anton Vasilyev | ed779b2 | 2017-08-12 22:45:50 +0100 | [diff] [blame] | 361 | release_mem_region(dd->io->start, size); |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 362 | exit_mem: |
| 363 | kfree(dd); |
| 364 | return ret; |
| 365 | } |
| 366 | |
| 367 | static int parport_ax88796_remove(struct platform_device *pdev) |
| 368 | { |
| 369 | struct parport *p = platform_get_drvdata(pdev); |
| 370 | struct ax_drvdata *dd = pp_to_drv(p); |
| 371 | |
| 372 | free_irq(p->irq, p); |
| 373 | parport_remove_port(p); |
| 374 | iounmap(dd->base); |
Anton Vasilyev | ed779b2 | 2017-08-12 22:45:50 +0100 | [diff] [blame] | 375 | release_mem_region(dd->io->start, resource_size(dd->io)); |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 376 | kfree(dd); |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | #ifdef CONFIG_PM |
| 382 | |
| 383 | static int parport_ax88796_suspend(struct platform_device *dev, |
| 384 | pm_message_t state) |
| 385 | { |
| 386 | struct parport *p = platform_get_drvdata(dev); |
| 387 | struct ax_drvdata *dd = pp_to_drv(p); |
| 388 | |
| 389 | parport_ax88796_save_state(p, &dd->suspend); |
| 390 | writeb(AX_CPR_nDOE | AX_CPR_STRB, dd->spp_cpr); |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | static int parport_ax88796_resume(struct platform_device *dev) |
| 395 | { |
| 396 | struct parport *p = platform_get_drvdata(dev); |
| 397 | struct ax_drvdata *dd = pp_to_drv(p); |
| 398 | |
| 399 | parport_ax88796_restore_state(p, &dd->suspend); |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | #else |
| 404 | #define parport_ax88796_suspend NULL |
| 405 | #define parport_ax88796_resume NULL |
| 406 | #endif |
| 407 | |
Kay Sievers | db358b4 | 2008-07-25 01:45:48 -0700 | [diff] [blame] | 408 | MODULE_ALIAS("platform:ax88796-pp"); |
| 409 | |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 410 | static struct platform_driver axdrv = { |
| 411 | .driver = { |
| 412 | .name = "ax88796-pp", |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 413 | }, |
| 414 | .probe = parport_ax88796_probe, |
| 415 | .remove = parport_ax88796_remove, |
| 416 | .suspend = parport_ax88796_suspend, |
| 417 | .resume = parport_ax88796_resume, |
| 418 | }; |
| 419 | |
Axel Lin | 782ee87 | 2011-11-27 12:43:49 +0800 | [diff] [blame] | 420 | module_platform_driver(axdrv); |
Ben Dooks | ad4063b | 2006-06-25 05:48:03 -0700 | [diff] [blame] | 421 | |
| 422 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
| 423 | MODULE_DESCRIPTION("AX88796 Parport parallel port driver"); |
| 424 | MODULE_LICENSE("GPL"); |