1// SPDX-License-Identifier: GPL-2.0
2/*
3 * General Purpose functions for the global management of the
4 * Communication Processor Module.
5 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
6 *
7 * In addition to the individual control of the communication
8 * channels, there are a few functions that globally affect the
9 * communication processor.
10 *
11 * Buffer descriptors must be allocated from the dual ported memory
12 * space. The allocator for that is here. When the communication
13 * process is reset, we reclaim the memory available. There is
14 * currently no deallocator for this memory.
15 * The amount of space available is platform dependent. On the
16 * MBX, the EPPC software loads additional microcode into the
17 * communication processor, and uses some of the DP ram for this
18 * purpose. Current, the first 512 bytes and the last 256 bytes of
19 * memory are used. Right now I am conservative and only use the
20 * memory that can never be used for microcode. If there are
21 * applications that require more DP ram, we can expand the boundaries
22 * but then we have to be careful of any downloaded microcode.
23 */
24#include <linux/errno.h>
25#include <linux/sched.h>
26#include <linux/kernel.h>
27#include <linux/dma-mapping.h>
28#include <linux/param.h>
29#include <linux/string.h>
30#include <linux/mm.h>
31#include <linux/interrupt.h>
32#include <linux/irq.h>
33#include <linux/module.h>
34#include <linux/spinlock.h>
35#include <linux/slab.h>
36#include <linux/of_irq.h>
37#include <asm/page.h>
38#include <asm/8xx_immap.h>
39#include <asm/cpm1.h>
40#include <asm/io.h>
41#include <asm/rheap.h>
42#include <asm/cpm.h>
43#include <asm/fixmap.h>
44
45#include <sysdev/fsl_soc.h>
46
47#ifdef CONFIG_8xx_GPIO
48#include <linux/gpio/driver.h>
49#endif
50
51#define CPM_MAP_SIZE (0x4000)
52
53cpm8xx_t __iomem *cpmp; /* Pointer to comm processor space */
54immap_t __iomem *mpc8xx_immr = (void __iomem *)VIRT_IMMR_BASE;
55
56void __init cpm_reset(void)
57{
58 cpmp = &mpc8xx_immr->im_cpm;
59
60#ifndef CONFIG_PPC_EARLY_DEBUG_CPM
61 /* Perform a reset. */
62 out_be16(&cpmp->cp_cpcr, CPM_CR_RST | CPM_CR_FLG);
63
64 /* Wait for it. */
65 while (in_be16(&cpmp->cp_cpcr) & CPM_CR_FLG);
66#endif
67
68#ifdef CONFIG_UCODE_PATCH
69 cpm_load_patch(cpmp);
70#endif
71
72 /*
73 * Set SDMA Bus Request priority 5.
74 * On 860T, this also enables FEC priority 6. I am not sure
75 * this is what we really want for some applications, but the
76 * manual recommends it.
77 * Bit 25, FAM can also be set to use FEC aggressive mode (860T).
78 */
79 if ((mfspr(SPRN_IMMR) & 0xffff) == 0x0900) /* MPC885 */
80 out_be32(&mpc8xx_immr->im_siu_conf.sc_sdcr, 0x40);
81 else
82 out_be32(&mpc8xx_immr->im_siu_conf.sc_sdcr, 1);
83}
84
85static DEFINE_SPINLOCK(cmd_lock);
86
87#define MAX_CR_CMD_LOOPS 10000
88
89int cpm_command(u32 command, u8 opcode)
90{
91 int i, ret;
92 unsigned long flags;
93
94 if (command & 0xffffff03)
95 return -EINVAL;
96
97 spin_lock_irqsave(&cmd_lock, flags);
98
99 ret = 0;
100 out_be16(&cpmp->cp_cpcr, command | CPM_CR_FLG | (opcode << 8));
101 for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
102 if ((in_be16(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0)
103 goto out;
104
105 printk(KERN_ERR "%s(): Not able to issue CPM command\n", __func__);
106 ret = -EIO;
107out:
108 spin_unlock_irqrestore(lock: &cmd_lock, flags);
109 return ret;
110}
111EXPORT_SYMBOL(cpm_command);
112
113/*
114 * Set a baud rate generator. This needs lots of work. There are
115 * four BRGs, any of which can be wired to any channel.
116 * The internal baud rate clock is the system clock divided by 16.
117 * This assumes the baudrate is 16x oversampled by the uart.
118 */
119#define BRG_INT_CLK (get_brgfreq())
120#define BRG_UART_CLK (BRG_INT_CLK/16)
121#define BRG_UART_CLK_DIV16 (BRG_UART_CLK/16)
122
123void
124cpm_setbrg(uint brg, uint rate)
125{
126 u32 __iomem *bp;
127
128 /* This is good enough to get SMCs running..... */
129 bp = &cpmp->cp_brgc1;
130 bp += brg;
131 /*
132 * The BRG has a 12-bit counter. For really slow baud rates (or
133 * really fast processors), we may have to further divide by 16.
134 */
135 if (((BRG_UART_CLK / rate) - 1) < 4096)
136 out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);
137 else
138 out_be32(bp, (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) |
139 CPM_BRG_EN | CPM_BRG_DIV16);
140}
141EXPORT_SYMBOL(cpm_setbrg);
142
143struct cpm_ioport16 {
144 __be16 dir, par, odr_sor, dat, intr;
145 __be16 res[3];
146};
147
148struct cpm_ioport32b {
149 __be32 dir, par, odr, dat;
150};
151
152struct cpm_ioport32e {
153 __be32 dir, par, sor, odr, dat;
154};
155
156static void __init cpm1_set_pin32(int port, int pin, int flags)
157{
158 struct cpm_ioport32e __iomem *iop;
159 pin = 1 << (31 - pin);
160
161 if (port == CPM_PORTB)
162 iop = (struct cpm_ioport32e __iomem *)
163 &mpc8xx_immr->im_cpm.cp_pbdir;
164 else
165 iop = (struct cpm_ioport32e __iomem *)
166 &mpc8xx_immr->im_cpm.cp_pedir;
167
168 if (flags & CPM_PIN_OUTPUT)
169 setbits32(&iop->dir, pin);
170 else
171 clrbits32(&iop->dir, pin);
172
173 if (!(flags & CPM_PIN_GPIO))
174 setbits32(&iop->par, pin);
175 else
176 clrbits32(&iop->par, pin);
177
178 if (port == CPM_PORTB) {
179 if (flags & CPM_PIN_OPENDRAIN)
180 setbits16(&mpc8xx_immr->im_cpm.cp_pbodr, pin);
181 else
182 clrbits16(&mpc8xx_immr->im_cpm.cp_pbodr, pin);
183 }
184
185 if (port == CPM_PORTE) {
186 if (flags & CPM_PIN_SECONDARY)
187 setbits32(&iop->sor, pin);
188 else
189 clrbits32(&iop->sor, pin);
190
191 if (flags & CPM_PIN_OPENDRAIN)
192 setbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
193 else
194 clrbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
195 }
196}
197
198static void __init cpm1_set_pin16(int port, int pin, int flags)
199{
200 struct cpm_ioport16 __iomem *iop =
201 (struct cpm_ioport16 __iomem *)&mpc8xx_immr->im_ioport;
202
203 pin = 1 << (15 - pin);
204
205 if (port != 0)
206 iop += port - 1;
207
208 if (flags & CPM_PIN_OUTPUT)
209 setbits16(&iop->dir, pin);
210 else
211 clrbits16(&iop->dir, pin);
212
213 if (!(flags & CPM_PIN_GPIO))
214 setbits16(&iop->par, pin);
215 else
216 clrbits16(&iop->par, pin);
217
218 if (port == CPM_PORTA) {
219 if (flags & CPM_PIN_OPENDRAIN)
220 setbits16(&iop->odr_sor, pin);
221 else
222 clrbits16(&iop->odr_sor, pin);
223 }
224 if (port == CPM_PORTC) {
225 if (flags & CPM_PIN_SECONDARY)
226 setbits16(&iop->odr_sor, pin);
227 else
228 clrbits16(&iop->odr_sor, pin);
229 if (flags & CPM_PIN_FALLEDGE)
230 setbits16(&iop->intr, pin);
231 else
232 clrbits16(&iop->intr, pin);
233 }
234}
235
236void __init cpm1_set_pin(enum cpm_port port, int pin, int flags)
237{
238 if (port == CPM_PORTB || port == CPM_PORTE)
239 cpm1_set_pin32(port: port, pin, flags);
240 else
241 cpm1_set_pin16(port: port, pin, flags);
242}
243
244int __init cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
245{
246 int shift;
247 int i, bits = 0;
248 u32 __iomem *reg;
249 u32 mask = 7;
250
251 u8 clk_map[][3] = {
252 {CPM_CLK_SCC1, CPM_BRG1, 0},
253 {CPM_CLK_SCC1, CPM_BRG2, 1},
254 {CPM_CLK_SCC1, CPM_BRG3, 2},
255 {CPM_CLK_SCC1, CPM_BRG4, 3},
256 {CPM_CLK_SCC1, CPM_CLK1, 4},
257 {CPM_CLK_SCC1, CPM_CLK2, 5},
258 {CPM_CLK_SCC1, CPM_CLK3, 6},
259 {CPM_CLK_SCC1, CPM_CLK4, 7},
260
261 {CPM_CLK_SCC2, CPM_BRG1, 0},
262 {CPM_CLK_SCC2, CPM_BRG2, 1},
263 {CPM_CLK_SCC2, CPM_BRG3, 2},
264 {CPM_CLK_SCC2, CPM_BRG4, 3},
265 {CPM_CLK_SCC2, CPM_CLK1, 4},
266 {CPM_CLK_SCC2, CPM_CLK2, 5},
267 {CPM_CLK_SCC2, CPM_CLK3, 6},
268 {CPM_CLK_SCC2, CPM_CLK4, 7},
269
270 {CPM_CLK_SCC3, CPM_BRG1, 0},
271 {CPM_CLK_SCC3, CPM_BRG2, 1},
272 {CPM_CLK_SCC3, CPM_BRG3, 2},
273 {CPM_CLK_SCC3, CPM_BRG4, 3},
274 {CPM_CLK_SCC3, CPM_CLK5, 4},
275 {CPM_CLK_SCC3, CPM_CLK6, 5},
276 {CPM_CLK_SCC3, CPM_CLK7, 6},
277 {CPM_CLK_SCC3, CPM_CLK8, 7},
278
279 {CPM_CLK_SCC4, CPM_BRG1, 0},
280 {CPM_CLK_SCC4, CPM_BRG2, 1},
281 {CPM_CLK_SCC4, CPM_BRG3, 2},
282 {CPM_CLK_SCC4, CPM_BRG4, 3},
283 {CPM_CLK_SCC4, CPM_CLK5, 4},
284 {CPM_CLK_SCC4, CPM_CLK6, 5},
285 {CPM_CLK_SCC4, CPM_CLK7, 6},
286 {CPM_CLK_SCC4, CPM_CLK8, 7},
287
288 {CPM_CLK_SMC1, CPM_BRG1, 0},
289 {CPM_CLK_SMC1, CPM_BRG2, 1},
290 {CPM_CLK_SMC1, CPM_BRG3, 2},
291 {CPM_CLK_SMC1, CPM_BRG4, 3},
292 {CPM_CLK_SMC1, CPM_CLK1, 4},
293 {CPM_CLK_SMC1, CPM_CLK2, 5},
294 {CPM_CLK_SMC1, CPM_CLK3, 6},
295 {CPM_CLK_SMC1, CPM_CLK4, 7},
296
297 {CPM_CLK_SMC2, CPM_BRG1, 0},
298 {CPM_CLK_SMC2, CPM_BRG2, 1},
299 {CPM_CLK_SMC2, CPM_BRG3, 2},
300 {CPM_CLK_SMC2, CPM_BRG4, 3},
301 {CPM_CLK_SMC2, CPM_CLK5, 4},
302 {CPM_CLK_SMC2, CPM_CLK6, 5},
303 {CPM_CLK_SMC2, CPM_CLK7, 6},
304 {CPM_CLK_SMC2, CPM_CLK8, 7},
305 };
306
307 switch (target) {
308 case CPM_CLK_SCC1:
309 reg = &mpc8xx_immr->im_cpm.cp_sicr;
310 shift = 0;
311 break;
312
313 case CPM_CLK_SCC2:
314 reg = &mpc8xx_immr->im_cpm.cp_sicr;
315 shift = 8;
316 break;
317
318 case CPM_CLK_SCC3:
319 reg = &mpc8xx_immr->im_cpm.cp_sicr;
320 shift = 16;
321 break;
322
323 case CPM_CLK_SCC4:
324 reg = &mpc8xx_immr->im_cpm.cp_sicr;
325 shift = 24;
326 break;
327
328 case CPM_CLK_SMC1:
329 reg = &mpc8xx_immr->im_cpm.cp_simode;
330 shift = 12;
331 break;
332
333 case CPM_CLK_SMC2:
334 reg = &mpc8xx_immr->im_cpm.cp_simode;
335 shift = 28;
336 break;
337
338 default:
339 printk(KERN_ERR "cpm1_clock_setup: invalid clock target\n");
340 return -EINVAL;
341 }
342
343 for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
344 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
345 bits = clk_map[i][2];
346 break;
347 }
348 }
349
350 if (i == ARRAY_SIZE(clk_map)) {
351 printk(KERN_ERR "cpm1_clock_setup: invalid clock combination\n");
352 return -EINVAL;
353 }
354
355 bits <<= shift;
356 mask <<= shift;
357
358 if (reg == &mpc8xx_immr->im_cpm.cp_sicr) {
359 if (mode == CPM_CLK_RTX) {
360 bits |= bits << 3;
361 mask |= mask << 3;
362 } else if (mode == CPM_CLK_RX) {
363 bits <<= 3;
364 mask <<= 3;
365 }
366 }
367
368 out_be32(reg, (in_be32(reg) & ~mask) | bits);
369
370 return 0;
371}
372
373/*
374 * GPIO LIB API implementation
375 */
376#ifdef CONFIG_8xx_GPIO
377
378struct cpm1_gpio16_chip {
379 struct gpio_chip gc;
380 void __iomem *regs;
381 spinlock_t lock;
382
383 /* shadowed data register to clear/set bits safely */
384 u16 cpdata;
385
386 /* IRQ associated with Pins when relevant */
387 int irq[16];
388};
389
390static void cpm1_gpio16_save_regs(struct cpm1_gpio16_chip *cpm1_gc)
391{
392 struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
393
394 cpm1_gc->cpdata = in_be16(&iop->dat);
395}
396
397static int cpm1_gpio16_get(struct gpio_chip *gc, unsigned int gpio)
398{
399 struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
400 struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
401 u16 pin_mask;
402
403 pin_mask = 1 << (15 - gpio);
404
405 return !!(in_be16(&iop->dat) & pin_mask);
406}
407
408static void __cpm1_gpio16_set(struct cpm1_gpio16_chip *cpm1_gc, u16 pin_mask, int value)
409{
410 struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
411
412 if (value)
413 cpm1_gc->cpdata |= pin_mask;
414 else
415 cpm1_gc->cpdata &= ~pin_mask;
416
417 out_be16(&iop->dat, cpm1_gc->cpdata);
418}
419
420static int cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
421{
422 struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
423 unsigned long flags;
424 u16 pin_mask = 1 << (15 - gpio);
425
426 spin_lock_irqsave(&cpm1_gc->lock, flags);
427
428 __cpm1_gpio16_set(cpm1_gc, pin_mask, value);
429
430 spin_unlock_irqrestore(&cpm1_gc->lock, flags);
431
432 return 0;
433}
434
435static int cpm1_gpio16_to_irq(struct gpio_chip *gc, unsigned int gpio)
436{
437 struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
438
439 return cpm1_gc->irq[gpio] ? : -ENXIO;
440}
441
442static int cpm1_gpio16_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
443{
444 struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
445 struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
446 unsigned long flags;
447 u16 pin_mask = 1 << (15 - gpio);
448
449 spin_lock_irqsave(&cpm1_gc->lock, flags);
450
451 setbits16(&iop->dir, pin_mask);
452 __cpm1_gpio16_set(cpm1_gc, pin_mask, val);
453
454 spin_unlock_irqrestore(&cpm1_gc->lock, flags);
455
456 return 0;
457}
458
459static int cpm1_gpio16_dir_in(struct gpio_chip *gc, unsigned int gpio)
460{
461 struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
462 struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
463 unsigned long flags;
464 u16 pin_mask = 1 << (15 - gpio);
465
466 spin_lock_irqsave(&cpm1_gc->lock, flags);
467
468 clrbits16(&iop->dir, pin_mask);
469
470 spin_unlock_irqrestore(&cpm1_gc->lock, flags);
471
472 return 0;
473}
474
475int cpm1_gpiochip_add16(struct device *dev)
476{
477 struct device_node *np = dev->of_node;
478 struct cpm1_gpio16_chip *cpm1_gc;
479 struct gpio_chip *gc;
480 u16 mask;
481
482 cpm1_gc = devm_kzalloc(dev, sizeof(*cpm1_gc), GFP_KERNEL);
483 if (!cpm1_gc)
484 return -ENOMEM;
485
486 spin_lock_init(&cpm1_gc->lock);
487
488 if (!of_property_read_u16(np, "fsl,cpm1-gpio-irq-mask", &mask)) {
489 int i, j;
490
491 for (i = 0, j = 0; i < 16; i++)
492 if (mask & (1 << (15 - i)))
493 cpm1_gc->irq[i] = irq_of_parse_and_map(np, j++);
494 }
495
496 gc = &cpm1_gc->gc;
497 gc->base = -1;
498 gc->ngpio = 16;
499 gc->direction_input = cpm1_gpio16_dir_in;
500 gc->direction_output = cpm1_gpio16_dir_out;
501 gc->get = cpm1_gpio16_get;
502 gc->set = cpm1_gpio16_set;
503 gc->to_irq = cpm1_gpio16_to_irq;
504 gc->parent = dev;
505 gc->owner = THIS_MODULE;
506
507 gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
508 if (!gc->label)
509 return -ENOMEM;
510
511 cpm1_gc->regs = devm_of_iomap(dev, np, 0, NULL);
512 if (IS_ERR(cpm1_gc->regs))
513 return PTR_ERR(cpm1_gc->regs);
514
515 cpm1_gpio16_save_regs(cpm1_gc);
516
517 return devm_gpiochip_add_data(dev, gc, cpm1_gc);
518}
519
520struct cpm1_gpio32_chip {
521 struct gpio_chip gc;
522 void __iomem *regs;
523 spinlock_t lock;
524
525 /* shadowed data register to clear/set bits safely */
526 u32 cpdata;
527};
528
529static void cpm1_gpio32_save_regs(struct cpm1_gpio32_chip *cpm1_gc)
530{
531 struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
532
533 cpm1_gc->cpdata = in_be32(&iop->dat);
534}
535
536static int cpm1_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
537{
538 struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
539 struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
540 u32 pin_mask;
541
542 pin_mask = 1 << (31 - gpio);
543
544 return !!(in_be32(&iop->dat) & pin_mask);
545}
546
547static void __cpm1_gpio32_set(struct cpm1_gpio32_chip *cpm1_gc, u32 pin_mask, int value)
548{
549 struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
550
551 if (value)
552 cpm1_gc->cpdata |= pin_mask;
553 else
554 cpm1_gc->cpdata &= ~pin_mask;
555
556 out_be32(&iop->dat, cpm1_gc->cpdata);
557}
558
559static int cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
560{
561 struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
562 unsigned long flags;
563 u32 pin_mask = 1 << (31 - gpio);
564
565 spin_lock_irqsave(&cpm1_gc->lock, flags);
566
567 __cpm1_gpio32_set(cpm1_gc, pin_mask, value);
568
569 spin_unlock_irqrestore(&cpm1_gc->lock, flags);
570
571 return 0;
572}
573
574static int cpm1_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
575{
576 struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
577 struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
578 unsigned long flags;
579 u32 pin_mask = 1 << (31 - gpio);
580
581 spin_lock_irqsave(&cpm1_gc->lock, flags);
582
583 setbits32(&iop->dir, pin_mask);
584 __cpm1_gpio32_set(cpm1_gc, pin_mask, val);
585
586 spin_unlock_irqrestore(&cpm1_gc->lock, flags);
587
588 return 0;
589}
590
591static int cpm1_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
592{
593 struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
594 struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
595 unsigned long flags;
596 u32 pin_mask = 1 << (31 - gpio);
597
598 spin_lock_irqsave(&cpm1_gc->lock, flags);
599
600 clrbits32(&iop->dir, pin_mask);
601
602 spin_unlock_irqrestore(&cpm1_gc->lock, flags);
603
604 return 0;
605}
606
607int cpm1_gpiochip_add32(struct device *dev)
608{
609 struct device_node *np = dev->of_node;
610 struct cpm1_gpio32_chip *cpm1_gc;
611 struct gpio_chip *gc;
612
613 cpm1_gc = devm_kzalloc(dev, sizeof(*cpm1_gc), GFP_KERNEL);
614 if (!cpm1_gc)
615 return -ENOMEM;
616
617 spin_lock_init(&cpm1_gc->lock);
618
619 gc = &cpm1_gc->gc;
620 gc->base = -1;
621 gc->ngpio = 32;
622 gc->direction_input = cpm1_gpio32_dir_in;
623 gc->direction_output = cpm1_gpio32_dir_out;
624 gc->get = cpm1_gpio32_get;
625 gc->set = cpm1_gpio32_set;
626 gc->parent = dev;
627 gc->owner = THIS_MODULE;
628
629 gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pOF", np);
630 if (!gc->label)
631 return -ENOMEM;
632
633 cpm1_gc->regs = devm_of_iomap(dev, np, 0, NULL);
634 if (IS_ERR(cpm1_gc->regs))
635 return PTR_ERR(cpm1_gc->regs);
636
637 cpm1_gpio32_save_regs(cpm1_gc);
638
639 return devm_gpiochip_add_data(dev, gc, cpm1_gc);
640}
641
642#endif /* CONFIG_8xx_GPIO */
643

source code of linux/arch/powerpc/platforms/8xx/cpm1.c