1 // SPDX-License-Identifier: GPL-2.0-only 2 /* parport_sunbpp.c: Parallel-port routines for SBUS 3 * 4 * Author: Derrick J. Brashear <shadow@dementia.org> 5 * 6 * based on work by: 7 * Phil Blundell <philb@gnu.org> 8 * Tim Waugh <tim@cyberelk.demon.co.uk> 9 * Jose Renau <renau@acm.org> 10 * David Campbell <campbell@tirian.che.curtin.edu.au> 11 * Grant Guenther <grant@torque.net> 12 * Eddie C. Dost <ecd@skynet.be> 13 * Stephen Williams (steve@icarus.com) 14 * Gus Baldauf (gbaldauf@ix.netcom.com) 15 * Peter Zaitcev 16 * Tom Dyas 17 * 18 * Updated to new SBUS device framework: David S. Miller <davem@davemloft.net> 19 * 20 */ 21 22 #include <linux/string.h> 23 #include <linux/module.h> 24 #include <linux/delay.h> 25 #include <linux/errno.h> 26 #include <linux/ioport.h> 27 #include <linux/kernel.h> 28 #include <linux/slab.h> 29 #include <linux/init.h> 30 #include <linux/of.h> 31 #include <linux/platform_device.h> 32 33 #include <linux/parport.h> 34 35 #include <asm/ptrace.h> 36 #include <linux/interrupt.h> 37 38 #include <asm/io.h> 39 #include <asm/oplib.h> /* OpenProm Library */ 40 #include <asm/dma.h> /* BPP uses LSI 64854 for DMA */ 41 #include <asm/irq.h> 42 #include <asm/sunbpp.h> 43 44 #undef __SUNBPP_DEBUG 45 #ifdef __SUNBPP_DEBUG 46 #define dprintk(x) printk x 47 #else 48 #define dprintk(x) 49 #endif 50 51 static void parport_sunbpp_disable_irq(struct parport *p) 52 { 53 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 54 u32 tmp; 55 56 tmp = sbus_readl(®s->p_csr); 57 tmp &= ~DMA_INT_ENAB; 58 sbus_writel(tmp, ®s->p_csr); 59 } 60 61 static void parport_sunbpp_enable_irq(struct parport *p) 62 { 63 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 64 u32 tmp; 65 66 tmp = sbus_readl(®s->p_csr); 67 tmp |= DMA_INT_ENAB; 68 sbus_writel(tmp, ®s->p_csr); 69 } 70 71 static void parport_sunbpp_write_data(struct parport *p, unsigned char d) 72 { 73 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 74 75 sbus_writeb(d, ®s->p_dr); 76 dprintk((KERN_DEBUG "wrote 0x%x\n", d)); 77 } 78 79 static unsigned char parport_sunbpp_read_data(struct parport *p) 80 { 81 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 82 83 return sbus_readb(®s->p_dr); 84 } 85 86 static unsigned char status_sunbpp_to_pc(struct parport *p) 87 { 88 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 89 unsigned char bits = 0; 90 unsigned char value_tcr = sbus_readb(®s->p_tcr); 91 unsigned char value_ir = sbus_readb(®s->p_ir); 92 93 if (!(value_ir & P_IR_ERR)) 94 bits |= PARPORT_STATUS_ERROR; 95 if (!(value_ir & P_IR_SLCT)) 96 bits |= PARPORT_STATUS_SELECT; 97 if (!(value_ir & P_IR_PE)) 98 bits |= PARPORT_STATUS_PAPEROUT; 99 if (value_tcr & P_TCR_ACK) 100 bits |= PARPORT_STATUS_ACK; 101 if (!(value_tcr & P_TCR_BUSY)) 102 bits |= PARPORT_STATUS_BUSY; 103 104 dprintk((KERN_DEBUG "tcr 0x%x ir 0x%x\n", value_tcr, value_ir)); 105 dprintk((KERN_DEBUG "read status 0x%x\n", bits)); 106 return bits; 107 } 108 109 static unsigned char control_sunbpp_to_pc(struct parport *p) 110 { 111 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 112 unsigned char bits = 0; 113 unsigned char value_tcr = sbus_readb(®s->p_tcr); 114 unsigned char value_or = sbus_readb(®s->p_or); 115 116 if (!(value_tcr & P_TCR_DS)) 117 bits |= PARPORT_CONTROL_STROBE; 118 if (!(value_or & P_OR_AFXN)) 119 bits |= PARPORT_CONTROL_AUTOFD; 120 if (!(value_or & P_OR_INIT)) 121 bits |= PARPORT_CONTROL_INIT; 122 if (value_or & P_OR_SLCT_IN) 123 bits |= PARPORT_CONTROL_SELECT; 124 125 dprintk((KERN_DEBUG "tcr 0x%x or 0x%x\n", value_tcr, value_or)); 126 dprintk((KERN_DEBUG "read control 0x%x\n", bits)); 127 return bits; 128 } 129 130 static unsigned char parport_sunbpp_read_control(struct parport *p) 131 { 132 return control_sunbpp_to_pc(p); 133 } 134 135 static unsigned char parport_sunbpp_frob_control(struct parport *p, 136 unsigned char mask, 137 unsigned char val) 138 { 139 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 140 unsigned char value_tcr = sbus_readb(®s->p_tcr); 141 unsigned char value_or = sbus_readb(®s->p_or); 142 143 dprintk((KERN_DEBUG "frob1: tcr 0x%x or 0x%x\n", 144 value_tcr, value_or)); 145 if (mask & PARPORT_CONTROL_STROBE) { 146 if (val & PARPORT_CONTROL_STROBE) { 147 value_tcr &= ~P_TCR_DS; 148 } else { 149 value_tcr |= P_TCR_DS; 150 } 151 } 152 if (mask & PARPORT_CONTROL_AUTOFD) { 153 if (val & PARPORT_CONTROL_AUTOFD) { 154 value_or &= ~P_OR_AFXN; 155 } else { 156 value_or |= P_OR_AFXN; 157 } 158 } 159 if (mask & PARPORT_CONTROL_INIT) { 160 if (val & PARPORT_CONTROL_INIT) { 161 value_or &= ~P_OR_INIT; 162 } else { 163 value_or |= P_OR_INIT; 164 } 165 } 166 if (mask & PARPORT_CONTROL_SELECT) { 167 if (val & PARPORT_CONTROL_SELECT) { 168 value_or |= P_OR_SLCT_IN; 169 } else { 170 value_or &= ~P_OR_SLCT_IN; 171 } 172 } 173 174 sbus_writeb(value_or, ®s->p_or); 175 sbus_writeb(value_tcr, ®s->p_tcr); 176 dprintk((KERN_DEBUG "frob2: tcr 0x%x or 0x%x\n", 177 value_tcr, value_or)); 178 return parport_sunbpp_read_control(p); 179 } 180 181 static void parport_sunbpp_write_control(struct parport *p, unsigned char d) 182 { 183 const unsigned char wm = (PARPORT_CONTROL_STROBE | 184 PARPORT_CONTROL_AUTOFD | 185 PARPORT_CONTROL_INIT | 186 PARPORT_CONTROL_SELECT); 187 188 parport_sunbpp_frob_control (p, wm, d & wm); 189 } 190 191 static unsigned char parport_sunbpp_read_status(struct parport *p) 192 { 193 return status_sunbpp_to_pc(p); 194 } 195 196 static void parport_sunbpp_data_forward (struct parport *p) 197 { 198 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 199 unsigned char value_tcr = sbus_readb(®s->p_tcr); 200 201 dprintk((KERN_DEBUG "forward\n")); 202 value_tcr &= ~P_TCR_DIR; 203 sbus_writeb(value_tcr, ®s->p_tcr); 204 } 205 206 static void parport_sunbpp_data_reverse (struct parport *p) 207 { 208 struct bpp_regs __iomem *regs = (struct bpp_regs __iomem *)p->base; 209 u8 val = sbus_readb(®s->p_tcr); 210 211 dprintk((KERN_DEBUG "reverse\n")); 212 val |= P_TCR_DIR; 213 sbus_writeb(val, ®s->p_tcr); 214 } 215 216 static void parport_sunbpp_init_state(struct pardevice *dev, struct parport_state *s) 217 { 218 s->u.pc.ctr = 0xc; 219 s->u.pc.ecr = 0x0; 220 } 221 222 static void parport_sunbpp_save_state(struct parport *p, struct parport_state *s) 223 { 224 s->u.pc.ctr = parport_sunbpp_read_control(p); 225 } 226 227 static void parport_sunbpp_restore_state(struct parport *p, struct parport_state *s) 228 { 229 parport_sunbpp_write_control(p, s->u.pc.ctr); 230 } 231 232 static struct parport_operations parport_sunbpp_ops = 233 { 234 .write_data = parport_sunbpp_write_data, 235 .read_data = parport_sunbpp_read_data, 236 237 .write_control = parport_sunbpp_write_control, 238 .read_control = parport_sunbpp_read_control, 239 .frob_control = parport_sunbpp_frob_control, 240 241 .read_status = parport_sunbpp_read_status, 242 243 .enable_irq = parport_sunbpp_enable_irq, 244 .disable_irq = parport_sunbpp_disable_irq, 245 246 .data_forward = parport_sunbpp_data_forward, 247 .data_reverse = parport_sunbpp_data_reverse, 248 249 .init_state = parport_sunbpp_init_state, 250 .save_state = parport_sunbpp_save_state, 251 .restore_state = parport_sunbpp_restore_state, 252 253 .epp_write_data = parport_ieee1284_epp_write_data, 254 .epp_read_data = parport_ieee1284_epp_read_data, 255 .epp_write_addr = parport_ieee1284_epp_write_addr, 256 .epp_read_addr = parport_ieee1284_epp_read_addr, 257 258 .ecp_write_data = parport_ieee1284_ecp_write_data, 259 .ecp_read_data = parport_ieee1284_ecp_read_data, 260 .ecp_write_addr = parport_ieee1284_ecp_write_addr, 261 262 .compat_write_data = parport_ieee1284_write_compat, 263 .nibble_read_data = parport_ieee1284_read_nibble, 264 .byte_read_data = parport_ieee1284_read_byte, 265 266 .owner = THIS_MODULE, 267 }; 268 269 static int bpp_probe(struct platform_device *op) 270 { 271 struct parport_operations *ops; 272 struct bpp_regs __iomem *regs; 273 int irq, dma, err = 0, size; 274 unsigned char value_tcr; 275 void __iomem *base; 276 struct parport *p; 277 278 irq = op->archdata.irqs[0]; 279 base = of_ioremap(&op->resource[0], 0, 280 resource_size(&op->resource[0]), 281 "sunbpp"); 282 if (!base) 283 return -ENODEV; 284 285 size = resource_size(&op->resource[0]); 286 dma = PARPORT_DMA_NONE; 287 288 ops = kmemdup(&parport_sunbpp_ops, sizeof(struct parport_operations), 289 GFP_KERNEL); 290 if (!ops) { 291 err = -ENOMEM; 292 goto out_unmap; 293 } 294 295 dprintk(("register_port\n")); 296 if (!(p = parport_register_port((unsigned long)base, irq, dma, ops))) { 297 err = -ENOMEM; 298 goto out_free_ops; 299 } 300 301 p->size = size; 302 p->dev = &op->dev; 303 304 if ((err = request_irq(p->irq, parport_irq_handler, 305 IRQF_SHARED, p->name, p)) != 0) { 306 goto out_put_port; 307 } 308 309 parport_sunbpp_enable_irq(p); 310 311 regs = (struct bpp_regs __iomem *)p->base; 312 313 value_tcr = sbus_readb(®s->p_tcr); 314 value_tcr &= ~P_TCR_DIR; 315 sbus_writeb(value_tcr, ®s->p_tcr); 316 317 pr_info("%s: sunbpp at 0x%lx\n", p->name, p->base); 318 319 dev_set_drvdata(&op->dev, p); 320 321 parport_announce_port(p); 322 323 return 0; 324 325 out_put_port: 326 parport_put_port(p); 327 328 out_free_ops: 329 kfree(ops); 330 331 out_unmap: 332 of_iounmap(&op->resource[0], base, size); 333 334 return err; 335 } 336 337 static void bpp_remove(struct platform_device *op) 338 { 339 struct parport *p = dev_get_drvdata(&op->dev); 340 struct parport_operations *ops = p->ops; 341 342 parport_remove_port(p); 343 344 if (p->irq != PARPORT_IRQ_NONE) { 345 parport_sunbpp_disable_irq(p); 346 free_irq(p->irq, p); 347 } 348 349 of_iounmap(&op->resource[0], (void __iomem *) p->base, p->size); 350 parport_put_port(p); 351 kfree(ops); 352 353 dev_set_drvdata(&op->dev, NULL); 354 } 355 356 static const struct of_device_id bpp_match[] = { 357 { 358 .name = "SUNW,bpp", 359 }, 360 {}, 361 }; 362 363 MODULE_DEVICE_TABLE(of, bpp_match); 364 365 static struct platform_driver bpp_sbus_driver = { 366 .driver = { 367 .name = "bpp", 368 .of_match_table = bpp_match, 369 }, 370 .probe = bpp_probe, 371 .remove_new = bpp_remove, 372 }; 373 374 module_platform_driver(bpp_sbus_driver); 375 376 MODULE_AUTHOR("Derrick J Brashear"); 377 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port"); 378 MODULE_VERSION("2.0"); 379 MODULE_LICENSE("GPL"); 380