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
parport_sunbpp_disable_irq(struct parport * p)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
parport_sunbpp_enable_irq(struct parport * p)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
parport_sunbpp_write_data(struct parport * p,unsigned char d)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
parport_sunbpp_read_data(struct parport * p)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
status_sunbpp_to_pc(struct parport * p)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
control_sunbpp_to_pc(struct parport * p)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
parport_sunbpp_read_control(struct parport * p)130 static unsigned char parport_sunbpp_read_control(struct parport *p)
131 {
132 return control_sunbpp_to_pc(p);
133 }
134
parport_sunbpp_frob_control(struct parport * p,unsigned char mask,unsigned char val)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
parport_sunbpp_write_control(struct parport * p,unsigned char d)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
parport_sunbpp_read_status(struct parport * p)191 static unsigned char parport_sunbpp_read_status(struct parport *p)
192 {
193 return status_sunbpp_to_pc(p);
194 }
195
parport_sunbpp_data_forward(struct parport * p)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
parport_sunbpp_data_reverse(struct parport * p)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
parport_sunbpp_init_state(struct pardevice * dev,struct parport_state * s)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
parport_sunbpp_save_state(struct parport * p,struct parport_state * s)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
parport_sunbpp_restore_state(struct parport * p,struct parport_state * s)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
bpp_probe(struct platform_device * op)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
bpp_remove(struct platform_device * op)337 static int 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 return 0;
356 }
357
358 static const struct of_device_id bpp_match[] = {
359 {
360 .name = "SUNW,bpp",
361 },
362 {},
363 };
364
365 MODULE_DEVICE_TABLE(of, bpp_match);
366
367 static struct platform_driver bpp_sbus_driver = {
368 .driver = {
369 .name = "bpp",
370 .of_match_table = bpp_match,
371 },
372 .probe = bpp_probe,
373 .remove = bpp_remove,
374 };
375
376 module_platform_driver(bpp_sbus_driver);
377
378 MODULE_AUTHOR("Derrick J Brashear");
379 MODULE_DESCRIPTION("Parport Driver for Sparc bidirectional Port");
380 MODULE_VERSION("2.0");
381 MODULE_LICENSE("GPL");
382