blob: f511a529b1e6595a4187968e138e181e873a61d2 [file] [log] [blame]
Roger Quadros9b0b5642022-10-20 16:30:49 +03001// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Texas Instruments GPMC Driver
4 *
5 * Copyright (C) 2021 Texas Instruments Incorporated - http://www.ti.com/
6 */
7
8#include <asm/io.h>
9#include <asm/arch/sys_proto.h>
10#include <clk.h>
11#include <common.h>
12#include <dm.h>
13#include <dm/device-internal.h>
14#include <dm/device_compat.h>
15#include <dm/devres.h>
16#include <dm/lists.h>
17#include <linux/mtd/omap_gpmc.h>
18#include <linux/ioport.h>
19#include <linux/io.h>
20#include "ti-gpmc.h"
21
22enum gpmc_clk_domain {
23 GPMC_CD_FCLK,
24 GPMC_CD_CLK
25};
26
27struct gpmc_cs_data {
28 const char *name;
29#define GPMC_CS_RESERVED BIT(0)
30 u32 flags;
31};
32
33struct ti_gpmc {
34 void __iomem *base;
35 u32 cs_num;
36 u32 nr_waitpins;
37 struct clk *l3_clk;
38 u32 capability_flags;
39 struct resource data;
40};
41
42static struct gpmc_cs_data gpmc_cs[GPMC_CS_NUM];
43static unsigned int gpmc_cs_num = GPMC_CS_NUM;
44static unsigned int gpmc_nr_waitpins;
45static unsigned int gpmc_capability;
46static void __iomem *gpmc_base;
47static struct clk *gpmc_l3_clk;
48
49/* Public, as required by nand/raw/omap_gpmc.c */
50const struct gpmc *gpmc_cfg;
51
52/*
53 * The first 1MB of GPMC address space is typically mapped to
54 * the internal ROM. Never allocate the first page, to
55 * facilitate bug detection; even if we didn't boot from ROM.
56 * As GPMC minimum partition size is 16MB we can only start from
57 * there.
58 */
59#define GPMC_MEM_START 0x1000000
60#define GPMC_MEM_END 0x3FFFFFFF
61
62static void gpmc_write_reg(int idx, u32 val)
63{
64 writel_relaxed(val, gpmc_base + idx);
65}
66
67static u32 gpmc_read_reg(int idx)
68{
69 return readl_relaxed(gpmc_base + idx);
70}
71
72static void gpmc_cs_write_reg(int cs, int idx, u32 val)
73{
74 void __iomem *reg_addr;
75
76 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
77 writel_relaxed(val, reg_addr);
78}
79
80static u32 gpmc_cs_read_reg(int cs, int idx)
81{
82 void __iomem *reg_addr;
83
84 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
85 return readl_relaxed(reg_addr);
86}
87
88static unsigned long gpmc_get_fclk_period(void)
89{
90 unsigned long rate = clk_get_rate(gpmc_l3_clk);
91
92 rate /= 1000;
93 rate = 1000000000 / rate; /* In picoseconds */
94
95 return rate;
96}
97
98/**
99 * gpmc_get_clk_period - get period of selected clock domain in ps
100 * @cs: Chip Select Region.
101 * @cd: Clock Domain.
102 *
103 * GPMC_CS_CONFIG1 GPMCFCLKDIVIDER for cs has to be setup
104 * prior to calling this function with GPMC_CD_CLK.
105 */
106static unsigned long gpmc_get_clk_period(int cs, enum gpmc_clk_domain cd)
107{
108 unsigned long tick_ps = gpmc_get_fclk_period();
109 u32 l;
110 int div;
111
112 switch (cd) {
113 case GPMC_CD_CLK:
114 /* get current clk divider */
115 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
116 div = (l & 0x03) + 1;
117 /* get GPMC_CLK period */
118 tick_ps *= div;
119 break;
120 case GPMC_CD_FCLK:
121 default:
122 break;
123 }
124
125 return tick_ps;
126}
127
128static unsigned int gpmc_ns_to_clk_ticks(unsigned int time_ns, int cs,
129 enum gpmc_clk_domain cd)
130{
131 unsigned long tick_ps;
132
133 /* Calculate in picosecs to yield more exact results */
134 tick_ps = gpmc_get_clk_period(cs, cd);
135
136 return (time_ns * 1000 + tick_ps - 1) / tick_ps;
137}
138
139static unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
140{
141 return gpmc_ns_to_clk_ticks(time_ns, /* any CS */ 0, GPMC_CD_FCLK);
142}
143
144static unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
145{
146 unsigned long tick_ps;
147
148 /* Calculate in picosecs to yield more exact results */
149 tick_ps = gpmc_get_fclk_period();
150
151 return (time_ps + tick_ps - 1) / tick_ps;
152}
153
154static __maybe_unused unsigned int gpmc_clk_ticks_to_ns(unsigned int ticks, int cs,
155 enum gpmc_clk_domain cd)
156{
157 return ticks * gpmc_get_clk_period(cs, cd) / 1000;
158}
159
160static inline void gpmc_cs_modify_reg(int cs, int reg, u32 mask, bool value)
161{
162 u32 l;
163
164 l = gpmc_cs_read_reg(cs, reg);
165 if (value)
166 l |= mask;
167 else
168 l &= ~mask;
169 gpmc_cs_write_reg(cs, reg, l);
170}
171
172static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p)
173{
174 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG1,
175 GPMC_CONFIG1_TIME_PARA_GRAN,
176 p->time_para_granularity);
177 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG2,
178 GPMC_CONFIG2_CSEXTRADELAY, p->cs_extra_delay);
179 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG3,
180 GPMC_CONFIG3_ADVEXTRADELAY, p->adv_extra_delay);
181 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
182 GPMC_CONFIG4_OEEXTRADELAY, p->oe_extra_delay);
183 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
184 GPMC_CONFIG4_WEEXTRADELAY, p->we_extra_delay);
185 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
186 GPMC_CONFIG6_CYCLE2CYCLESAMECSEN,
187 p->cycle2cyclesamecsen);
188 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
189 GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN,
190 p->cycle2cyclediffcsen);
191}
192
193#if IS_ENABLED(CONFIG_TI_GPMC_DEBUG)
194/**
195 * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it.
196 * @cs: Chip Select Region
197 * @reg: GPMC_CS_CONFIGn register offset.
198 * @st_bit: Start Bit
199 * @end_bit: End Bit. Must be >= @st_bit.
200 * @max: Maximum parameter value (before optional @shift).
201 * If 0, maximum is as high as @st_bit and @end_bit allow.
202 * @name: DTS node name, w/o "gpmc,"
203 * @cd: Clock Domain of timing parameter.
204 * @shift: Parameter value left shifts @shift, which is then printed instead of value.
205 * @raw: Raw Format Option.
206 * raw format: gpmc,name = <value>
207 * tick format: gpmc,name = <value> /&zwj;* x ns -- y ns; x ticks *&zwj;/
208 * Where x ns -- y ns result in the same tick value.
209 * When @max is exceeded, "invalid" is printed inside comment.
210 * @noval: Parameter values equal to 0 are not printed.
211 * @return: Specified timing parameter (after optional @shift).
212 *
213 */
214static int get_gpmc_timing_reg(/* timing specifiers */
215 int cs, int reg, int st_bit, int end_bit, int max,
216 const char *name, const enum gpmc_clk_domain cd,
217 /* value transform */
218 int shift,
219 /* format specifiers */
220 bool raw, bool noval)
221{
222 u32 l;
223 int nr_bits;
224 int mask;
225 bool invalid;
226
227 l = gpmc_cs_read_reg(cs, reg);
228 nr_bits = end_bit - st_bit + 1;
229 mask = (1 << nr_bits) - 1;
230 l = (l >> st_bit) & mask;
231 if (!max)
232 max = mask;
233 invalid = l > max;
234 if (shift)
235 l = (shift << l);
236 if (noval && l == 0)
237 return 0;
238 if (!raw) {
239 /* DTS tick format for timings in ns */
240 unsigned int time_ns;
241 unsigned int time_ns_min = 0;
242
243 if (l)
244 time_ns_min = gpmc_clk_ticks_to_ns(l - 1, cs, cd) + 1;
245 time_ns = gpmc_clk_ticks_to_ns(l, cs, cd);
246 pr_info("gpmc,%s = <%u>; /* %u ns - %u ns; %i ticks%s*/\n",
247 name, time_ns, time_ns_min, time_ns, l,
248 invalid ? "; invalid " : " ");
249 } else {
250 /* raw format */
251 pr_info("gpmc,%s = <%u>;%s\n", name, l,
252 invalid ? " /* invalid */" : "");
253 }
254
255 return l;
256}
257
258#define GPMC_PRINT_CONFIG(cs, config) \
259 pr_info("CS%i %s: 0x%08x\n", cs, #config, \
260 gpmc_cs_read_reg(cs, config))
261#define GPMC_GET_RAW(reg, st, end, field) \
262 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 0)
263#define GPMC_GET_RAW_MAX(reg, st, end, max, field) \
264 get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, 0, 1, 0)
265#define GPMC_GET_RAW_BOOL(reg, st, end, field) \
266 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 1)
267#define GPMC_GET_RAW_SHIFT_MAX(reg, st, end, shift, max, field) \
268 get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, (shift), 1, 1)
269#define GPMC_GET_TICKS(reg, st, end, field) \
270 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 0, 0)
271#define GPMC_GET_TICKS_CD(reg, st, end, field, cd) \
272 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, (cd), 0, 0, 0)
273#define GPMC_GET_TICKS_CD_MAX(reg, st, end, max, field, cd) \
274 get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, (cd), 0, 0, 0)
275
276static void gpmc_show_regs(int cs, const char *desc)
277{
278 pr_info("gpmc cs%i %s:\n", cs, desc);
279 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG1);
280 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG2);
281 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG3);
282 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG4);
283 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG5);
284 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG6);
285}
286
287/*
288 * Note that gpmc,wait-pin handing wrongly assumes bit 8 is available,
289 * see commit c9fb809.
290 */
291static void gpmc_cs_show_timings(int cs, const char *desc)
292{
293 gpmc_show_regs(cs, desc);
294
295 pr_info("gpmc cs%i access configuration:\n", cs);
296 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 4, 4, "time-para-granularity");
297 GPMC_GET_RAW(GPMC_CS_CONFIG1, 8, 9, "mux-add-data");
298 GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 12, 13, 1,
299 GPMC_CONFIG1_DEVICESIZE_MAX, "device-width");
300 GPMC_GET_RAW(GPMC_CS_CONFIG1, 16, 17, "wait-pin");
301 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 21, 21, "wait-on-write");
302 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 22, 22, "wait-on-read");
303 GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 23, 24, 4,
304 GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX,
305 "burst-length");
306 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 27, 27, "sync-write");
307 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 28, 28, "burst-write");
308 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 29, 29, "gpmc,sync-read");
309 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 30, 30, "burst-read");
310 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 31, 31, "burst-wrap");
311
312 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG2, 7, 7, "cs-extra-delay");
313
314 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG3, 7, 7, "adv-extra-delay");
315
316 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG4, 23, 23, "we-extra-delay");
317 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG4, 7, 7, "oe-extra-delay");
318
319 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG6, 7, 7, "cycle2cycle-samecsen");
320 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG6, 6, 6, "cycle2cycle-diffcsen");
321
322 pr_info("gpmc cs%i timings configuration:\n", cs);
323 GPMC_GET_TICKS(GPMC_CS_CONFIG2, 0, 3, "cs-on-ns");
324 GPMC_GET_TICKS(GPMC_CS_CONFIG2, 8, 12, "cs-rd-off-ns");
325 GPMC_GET_TICKS(GPMC_CS_CONFIG2, 16, 20, "cs-wr-off-ns");
326
327 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 0, 3, "adv-on-ns");
328 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 8, 12, "adv-rd-off-ns");
329 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 16, 20, "adv-wr-off-ns");
330 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
331 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 4, 6, "adv-aad-mux-on-ns");
332 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 24, 26,
333 "adv-aad-mux-rd-off-ns");
334 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 28, 30,
335 "adv-aad-mux-wr-off-ns");
336 }
337
338 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 0, 3, "oe-on-ns");
339 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 8, 12, "oe-off-ns");
340 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
341 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 4, 6, "oe-aad-mux-on-ns");
342 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 13, 15, "oe-aad-mux-off-ns");
343 }
344 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 16, 19, "we-on-ns");
345 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 24, 28, "we-off-ns");
346
347 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 0, 4, "rd-cycle-ns");
348 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 8, 12, "wr-cycle-ns");
349 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 16, 20, "access-ns");
350
351 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 24, 27, "page-burst-access-ns");
352
353 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 0, 3, "bus-turnaround-ns");
354 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 8, 11, "cycle2cycle-delay-ns");
355
356 GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 18, 19,
357 GPMC_CONFIG1_WAITMONITORINGTIME_MAX,
358 "wait-monitoring-ns", GPMC_CD_CLK);
359 GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 25, 26,
360 GPMC_CONFIG1_CLKACTIVATIONTIME_MAX,
361 "clk-activation-ns", GPMC_CD_FCLK);
362
363 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 16, 19, "wr-data-mux-bus-ns");
364 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 24, 28, "wr-access-ns");
365}
366#else
367static inline void gpmc_cs_show_timings(int cs, const char *desc)
368{
369}
370#endif
371
372/**
373 * set_gpmc_timing_reg - set a single timing parameter for Chip Select Region.
374 * Caller is expected to have initialized CONFIG1 GPMCFCLKDIVIDER
375 * prior to calling this function with @cd equal to GPMC_CD_CLK.
376 *
377 * @cs: Chip Select Region.
378 * @reg: GPMC_CS_CONFIGn register offset.
379 * @st_bit: Start Bit
380 * @end_bit: End Bit. Must be >= @st_bit.
381 * @max: Maximum parameter value.
382 * If 0, maximum is as high as @st_bit and @end_bit allow.
383 * @time: Timing parameter in ns.
384 * @cd: Timing parameter clock domain.
385 * @name: Timing parameter name.
386 * @return: 0 on success, -1 on error.
387 */
388static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, int max,
389 int time, enum gpmc_clk_domain cd, const char *name)
390{
391 u32 l;
392 int ticks, mask, nr_bits;
393
394 if (time == 0)
395 ticks = 0;
396 else
397 ticks = gpmc_ns_to_clk_ticks(time, cs, cd);
398 nr_bits = end_bit - st_bit + 1;
399 mask = (1 << nr_bits) - 1;
400
401 if (!max)
402 max = mask;
403
404 if (ticks > max) {
405 pr_err("%s: GPMC CS%d: %s %d ns, %d ticks > %d ticks\n",
406 __func__, cs, name, time, ticks, max);
407
408 return -1;
409 }
410
411 l = gpmc_cs_read_reg(cs, reg);
412 if (IS_ENABLED(CONFIG_TI_GPMC_DEBUG)) {
413 pr_info("GPMC CS%d: %-17s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
414 cs, name, ticks, gpmc_get_clk_period(cs, cd) * ticks / 1000,
415 (l >> st_bit) & mask, time);
416 }
417
418 l &= ~(mask << st_bit);
419 l |= ticks << st_bit;
420 gpmc_cs_write_reg(cs, reg, l);
421
422 return 0;
423}
424
425/**
426 * gpmc_calc_waitmonitoring_divider - calculate proper GPMCFCLKDIVIDER based on WAITMONITORINGTIME
427 * WAITMONITORINGTIME will be _at least_ as long as desired, i.e.
428 * read --> don't sample bus too early
429 * write --> data is longer on bus
430 *
431 * Formula:
432 * gpmc_clk_div + 1 = ceil(ceil(waitmonitoringtime_ns / gpmc_fclk_ns)
433 * / waitmonitoring_ticks)
434 * WAITMONITORINGTIME resulting in 0 or 1 tick with div = 1 are caught by
435 * div <= 0 check.
436 *
437 * @wait_monitoring: WAITMONITORINGTIME in ns.
438 * @return: -1 on failure to scale, else proper divider > 0.
439 */
440static int gpmc_calc_waitmonitoring_divider(unsigned int wait_monitoring)
441{
442 int div = gpmc_ns_to_ticks(wait_monitoring);
443
444 div += GPMC_CONFIG1_WAITMONITORINGTIME_MAX - 1;
445 div /= GPMC_CONFIG1_WAITMONITORINGTIME_MAX;
446
447 if (div > 4)
448 return -1;
449 if (div <= 0)
450 div = 1;
451
452 return div;
453}
454
455/**
456 * gpmc_calc_divider - calculate GPMC_FCLK divider for sync_clk GPMC_CLK period.
457 * @sync_clk: GPMC_CLK period in ps.
458 * @return: Returns at least 1 if GPMC_FCLK can be divided to GPMC_CLK.
459 * Else, returns -1.
460 */
461static int gpmc_calc_divider(unsigned int sync_clk)
462{
463 int div = gpmc_ps_to_ticks(sync_clk);
464
465 if (div > 4)
466 return -1;
467 if (div <= 0)
468 div = 1;
469
470 return div;
471}
472
473/**
474 * gpmc_cs_set_timings - program timing parameters for Chip Select Region.
475 * @cs: Chip Select Region.
476 * @t: GPMC timing parameters.
477 * @s: GPMC timing settings.
478 * @return: 0 on success, -1 on error.
479 */
480static int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t,
481 const struct gpmc_settings *s)
482{
483 int div, ret;
484 u32 l;
485
486 div = gpmc_calc_divider(t->sync_clk);
487 if (div < 0)
488 return -EINVAL;
489
490 /*
491 * See if we need to change the divider for waitmonitoringtime.
492 *
493 * Calculate GPMCFCLKDIVIDER independent of gpmc,sync-clk-ps in DT for
494 * pure asynchronous accesses, i.e. both read and write asynchronous.
495 * However, only do so if WAITMONITORINGTIME is actually used, i.e.
496 * either WAITREADMONITORING or WAITWRITEMONITORING is set.
497 *
498 * This statement must not change div to scale async WAITMONITORINGTIME
499 * to protect mixed synchronous and asynchronous accesses.
500 *
501 * We raise an error later if WAITMONITORINGTIME does not fit.
502 */
503 if (!s->sync_read && !s->sync_write &&
504 (s->wait_on_read || s->wait_on_write)
505 ) {
506 div = gpmc_calc_waitmonitoring_divider(t->wait_monitoring);
507 if (div < 0) {
508 pr_err("%s: waitmonitoringtime %3d ns too large for greatest gpmcfclkdivider.\n",
509 __func__,
510 t->wait_monitoring
511 );
512 return -ENXIO;
513 }
514 }
515
516 ret = 0;
517 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG2, 0, 3, 0, t->cs_on,
518 GPMC_CD_FCLK, "cs_on");
519 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG2, 8, 12, 0, t->cs_rd_off,
520 GPMC_CD_FCLK, "cs_rd_off");
521 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG2, 16, 20, 0, t->cs_wr_off,
522 GPMC_CD_FCLK, "cs_wr_off");
523 if (ret)
524 return -ENXIO;
525
526 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 0, 3, 0, t->adv_on,
527 GPMC_CD_FCLK, "adv_on");
528 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 8, 12, 0, t->adv_rd_off,
529 GPMC_CD_FCLK, "adv_rd_off");
530 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 16, 20, 0, t->adv_wr_off,
531 GPMC_CD_FCLK, "adv_wr_off");
532 if (ret)
533 return -ENXIO;
534
535 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
536 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 4, 6, 0,
537 t->adv_aad_mux_on, GPMC_CD_FCLK,
538 "adv_aad_mux_on");
539 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 24, 26, 0,
540 t->adv_aad_mux_rd_off, GPMC_CD_FCLK,
541 "adv_aad_mux_rd_off");
542 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 28, 30, 0,
543 t->adv_aad_mux_wr_off, GPMC_CD_FCLK,
544 "adv_aad_mux_wr_off");
545 if (ret)
546 return -ENXIO;
547 }
548
549 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 0, 3, 0, t->oe_on,
550 GPMC_CD_FCLK, "oe_on");
551 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 8, 12, 0, t->oe_off,
552 GPMC_CD_FCLK, "oe_off");
553 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
554 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 4, 6, 0,
555 t->oe_aad_mux_on, GPMC_CD_FCLK,
556 "oe_aad_mux_on");
557 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 13, 15, 0,
558 t->oe_aad_mux_off, GPMC_CD_FCLK,
559 "oe_aad_mux_off");
560 }
561 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 16, 19, 0, t->we_on,
562 GPMC_CD_FCLK, "we_on");
563 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 24, 28, 0, t->we_off,
564 GPMC_CD_FCLK, "we_off");
565 if (ret)
566 return -ENXIO;
567
568 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 0, 4, 0, t->rd_cycle,
569 GPMC_CD_FCLK, "rd_cycle");
570 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 8, 12, 0, t->wr_cycle,
571 GPMC_CD_FCLK, "wr_cycle");
572 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 16, 20, 0, t->access,
573 GPMC_CD_FCLK, "access");
574 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 24, 27, 0,
575 t->page_burst_access, GPMC_CD_FCLK,
576 "page_burst_access");
577 if (ret)
578 return -ENXIO;
579
580 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 0, 3, 0,
581 t->bus_turnaround, GPMC_CD_FCLK,
582 "bus_turnaround");
583 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 8, 11, 0,
584 t->cycle2cycle_delay, GPMC_CD_FCLK,
585 "cycle2cycle_delay");
586 if (ret)
587 return -ENXIO;
588
589 if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS) {
590 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 16, 19, 0,
591 t->wr_data_mux_bus, GPMC_CD_FCLK,
592 "wr_data_mux_bus");
593 if (ret)
594 return -ENXIO;
595 }
596 if (gpmc_capability & GPMC_HAS_WR_ACCESS) {
597 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 24, 28, 0,
598 t->wr_access, GPMC_CD_FCLK,
599 "wr_access");
600 if (ret)
601 return -ENXIO;
602 }
603
604 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
605 l &= ~0x03;
606 l |= (div - 1);
607 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
608
609 ret = 0;
610 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG1, 18, 19,
611 GPMC_CONFIG1_WAITMONITORINGTIME_MAX,
612 t->wait_monitoring, GPMC_CD_CLK,
613 "wait_monitoring");
614 ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG1, 25, 26,
615 GPMC_CONFIG1_CLKACTIVATIONTIME_MAX,
616 t->clk_activation, GPMC_CD_FCLK,
617 "clk_activation");
618 if (ret)
619 return -ENXIO;
620
621 if (IS_ENABLED(CONFIG_TI_GPMC_DEBUG)) {
622 pr_info("GPMC CS%d CLK period is %lu ns (div %d)\n",
623 cs, (div * gpmc_get_fclk_period()) / 1000, div);
624 }
625
626 gpmc_cs_bool_timings(cs, &t->bool_timings);
627 gpmc_cs_show_timings(cs, "after gpmc_set_timings");
628
629 return 0;
630}
631
632static int gpmc_cs_set_memconf(int cs, resource_size_t base, u32 size)
633{
634 u32 l;
635 u32 mask;
636
637 /*
638 * Ensure that base address is aligned on a
639 * boundary equal to or greater than size.
640 */
641 if (base & (size - 1))
642 return -EINVAL;
643
644 base >>= GPMC_CHUNK_SHIFT;
645 mask = (1 << GPMC_SECTION_SHIFT) - size;
646 mask >>= GPMC_CHUNK_SHIFT;
647 mask <<= GPMC_CONFIG7_MASKADDRESS_OFFSET;
648
649 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
650 l &= ~GPMC_CONFIG7_MASK;
651 l |= base & GPMC_CONFIG7_BASEADDRESS_MASK;
652 l |= mask & GPMC_CONFIG7_MASKADDRESS_MASK;
653 l |= GPMC_CONFIG7_CSVALID;
654 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
655
656 return 0;
657}
658
659static void gpmc_cs_enable_mem(int cs)
660{
661 u32 l;
662
663 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
664 l |= GPMC_CONFIG7_CSVALID;
665 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
666}
667
668static void gpmc_cs_disable_mem(int cs)
669{
670 u32 l;
671
672 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
673 l &= ~GPMC_CONFIG7_CSVALID;
674 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
675}
676
677static void gpmc_cs_set_reserved(int cs, int reserved)
678{
679 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
680
681 gpmc->flags |= GPMC_CS_RESERVED;
682}
683
684static bool gpmc_cs_reserved(int cs)
685{
686 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
687
688 return gpmc->flags & GPMC_CS_RESERVED;
689}
690
691static unsigned long gpmc_mem_align(unsigned long size)
692{
693 int order;
694
695 size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
696 order = GPMC_CHUNK_SHIFT - 1;
697 do {
698 size >>= 1;
699 order++;
700 } while (size);
701 size = 1 << order;
702 return size;
703}
704
705static int gpmc_cs_request(ofnode node, int cs, struct resource *res)
706{
707 int r = -1;
708 u32 size;
709 resource_size_t addr_base = res->start;
710
711 if (cs >= gpmc_cs_num) {
712 pr_err("%s: requested chip-select is disabled\n", __func__);
713 return -ENODEV;
714 }
715
716 size = gpmc_mem_align(resource_size(res));
717 if (size > (1 << GPMC_SECTION_SHIFT))
718 return -ENOMEM;
719
720 if (gpmc_cs_reserved(cs)) {
721 r = -EBUSY;
722 goto out;
723 }
724
725 if (addr_base & (SZ_16M - 1)) {
726 pr_err("CS region should be aligned to 16M boundary\n");
727 goto out;
728 }
729
730 /* Disable CS while changing base address and size mask */
731 gpmc_cs_disable_mem(cs);
732
733 r = gpmc_cs_set_memconf(cs, addr_base, size);
734 if (r < 0)
735 goto out;
736
737 /* Enable CS */
738 gpmc_cs_enable_mem(cs);
739 gpmc_cs_set_reserved(cs, 1);
740out:
741 return r;
742}
743
744static void gpmc_cs_free(int cs)
745{
746 if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) {
747 pr_warn("Trying to free non-reserved GPMC CS%d\n", cs);
748 return;
749 }
750
751 gpmc_cs_disable_mem(cs);
752 gpmc_cs_set_reserved(cs, 0);
753}
754
755/**
756 * gpmc_configure - write request to configure gpmc
757 * @cmd: command type
758 * @wval: value to write
759 * @return status of the operation
760 */
761static int gpmc_configure(int cmd, int wval)
762{
763 u32 regval;
764
765 switch (cmd) {
766 case GPMC_CONFIG_WP:
767 regval = gpmc_read_reg(GPMC_CONFIG);
768 if (wval)
769 regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
770 else
771 regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */
772 gpmc_write_reg(GPMC_CONFIG, regval);
773 break;
774
775 default:
776 pr_err("%s: command not supported\n", __func__);
777 return -EINVAL;
778 }
779
780 return 0;
781}
782
783/**
784 * gpmc_cs_program_settings - programs non-timing related settings
785 * @cs: GPMC chip-select to program
786 * @p: pointer to GPMC settings structure
787 *
788 * Programs non-timing related settings for a GPMC chip-select, such as
789 * bus-width, burst configuration, etc. Function should be called once
790 * for each chip-select that is being used and must be called before
791 * calling gpmc_cs_set_timings() as timing parameters in the CONFIG1
792 * register will be initialised to zero by this function. Returns 0 on
793 * success and appropriate negative error code on failure.
794 */
795static int gpmc_cs_program_settings(int cs, struct gpmc_settings *p)
796{
797 u32 config1;
798
799 if (!p->device_width || p->device_width > GPMC_DEVWIDTH_16BIT) {
800 pr_err("%s: invalid width %d!", __func__, p->device_width);
801 return -EINVAL;
802 }
803
804 /* Address-data multiplexing not supported for NAND devices */
805 if (p->device_nand && p->mux_add_data) {
806 pr_err("%s: invalid configuration!\n", __func__);
807 return -EINVAL;
808 }
809
810 if (p->mux_add_data > GPMC_MUX_AD ||
811 (p->mux_add_data == GPMC_MUX_AAD &&
812 !(gpmc_capability & GPMC_HAS_MUX_AAD))) {
813 pr_err("%s: invalid multiplex configuration!\n", __func__);
814 return -EINVAL;
815 }
816
817 /* Page/burst mode supports lengths of 4, 8 and 16 bytes */
818 if (p->burst_read || p->burst_write) {
819 switch (p->burst_len) {
820 case GPMC_BURST_4:
821 case GPMC_BURST_8:
822 case GPMC_BURST_16:
823 break;
824 default:
825 pr_err("%s: invalid page/burst-length (%d)\n",
826 __func__, p->burst_len);
827 return -EINVAL;
828 }
829 }
830
831 if (p->wait_pin > gpmc_nr_waitpins) {
832 pr_err("%s: invalid wait-pin (%d)\n", __func__, p->wait_pin);
833 return -EINVAL;
834 }
835
836 config1 = GPMC_CONFIG1_DEVICESIZE((p->device_width - 1));
837
838 if (p->sync_read)
839 config1 |= GPMC_CONFIG1_READTYPE_SYNC;
840 if (p->sync_write)
841 config1 |= GPMC_CONFIG1_WRITETYPE_SYNC;
842 if (p->wait_on_read)
843 config1 |= GPMC_CONFIG1_WAIT_READ_MON;
844 if (p->wait_on_write)
845 config1 |= GPMC_CONFIG1_WAIT_WRITE_MON;
846 if (p->wait_on_read || p->wait_on_write)
847 config1 |= GPMC_CONFIG1_WAIT_PIN_SEL(p->wait_pin);
848 if (p->device_nand)
849 config1 |= GPMC_CONFIG1_DEVICETYPE(GPMC_DEVICETYPE_NAND);
850 if (p->mux_add_data)
851 config1 |= GPMC_CONFIG1_MUXTYPE(p->mux_add_data);
852 if (p->burst_read)
853 config1 |= GPMC_CONFIG1_READMULTIPLE_SUPP;
854 if (p->burst_write)
855 config1 |= GPMC_CONFIG1_WRITEMULTIPLE_SUPP;
856 if (p->burst_read || p->burst_write) {
857 config1 |= GPMC_CONFIG1_PAGE_LEN(p->burst_len >> 3);
858 config1 |= p->burst_wrap ? GPMC_CONFIG1_WRAPBURST_SUPP : 0;
859 }
860
861 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, config1);
862
863 return 0;
864}
865
866static void gpmc_cs_set_name(int cs, const char *name)
867{
868 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
869
870 gpmc->name = name;
871}
872
873static const char *gpmc_cs_get_name(int cs)
874{
875 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
876
877 return gpmc->name;
878}
879
880/**
881 * gpmc_read_settings_dt - read gpmc settings from device-tree
882 * @np: pointer to device-tree node for a gpmc child device
883 * @p: pointer to gpmc settings structure
884 *
885 * Reads the GPMC settings for a GPMC child device from device-tree and
886 * stores them in the GPMC settings structure passed. The GPMC settings
887 * structure is initialised to zero by this function and so any
888 * previously stored settings will be cleared.
889 */
890static void gpmc_read_settings_dt(ofnode np, struct gpmc_settings *p)
891{
892 memset(p, 0, sizeof(struct gpmc_settings));
893
894 p->sync_read = ofnode_read_bool(np, "gpmc,sync-read");
895 p->sync_write = ofnode_read_bool(np, "gpmc,sync-write");
896 ofnode_read_u32(np, "gpmc,device-width", &p->device_width);
897 ofnode_read_u32(np, "gpmc,mux-add-data", &p->mux_add_data);
898
899 if (!ofnode_read_u32(np, "gpmc,burst-length", &p->burst_len)) {
900 p->burst_wrap = ofnode_read_bool(np, "gpmc,burst-wrap");
901 p->burst_read = ofnode_read_bool(np, "gpmc,burst-read");
902 p->burst_write = ofnode_read_bool(np, "gpmc,burst-write");
903 if (!p->burst_read && !p->burst_write)
904 pr_warn("%s: page/burst-length set but not used!\n",
905 __func__);
906 }
907
908 if (!ofnode_read_u32(np, "gpmc,wait-pin", &p->wait_pin)) {
909 p->wait_on_read = ofnode_read_bool(np,
910 "gpmc,wait-on-read");
911 p->wait_on_write = ofnode_read_bool(np,
912 "gpmc,wait-on-write");
913 if (!p->wait_on_read && !p->wait_on_write)
914 pr_debug("%s: rd/wr wait monitoring not enabled!\n",
915 __func__);
916 }
917}
918
919static void gpmc_read_timings_dt(ofnode np,
920 struct gpmc_timings *gpmc_t)
921{
922 struct gpmc_bool_timings *p;
923
924 if (!gpmc_t)
925 return;
926
927 memset(gpmc_t, 0, sizeof(*gpmc_t));
928
929 /* minimum clock period for syncronous mode */
930 ofnode_read_u32(np, "gpmc,sync-clk-ps", &gpmc_t->sync_clk);
931
932 /* chip select timtings */
933 ofnode_read_u32(np, "gpmc,cs-on-ns", &gpmc_t->cs_on);
934 ofnode_read_u32(np, "gpmc,cs-rd-off-ns", &gpmc_t->cs_rd_off);
935 ofnode_read_u32(np, "gpmc,cs-wr-off-ns", &gpmc_t->cs_wr_off);
936
937 /* ADV signal timings */
938 ofnode_read_u32(np, "gpmc,adv-on-ns", &gpmc_t->adv_on);
939 ofnode_read_u32(np, "gpmc,adv-rd-off-ns", &gpmc_t->adv_rd_off);
940 ofnode_read_u32(np, "gpmc,adv-wr-off-ns", &gpmc_t->adv_wr_off);
941 ofnode_read_u32(np, "gpmc,adv-aad-mux-on-ns",
942 &gpmc_t->adv_aad_mux_on);
943 ofnode_read_u32(np, "gpmc,adv-aad-mux-rd-off-ns",
944 &gpmc_t->adv_aad_mux_rd_off);
945 ofnode_read_u32(np, "gpmc,adv-aad-mux-wr-off-ns",
946 &gpmc_t->adv_aad_mux_wr_off);
947
948 /* WE signal timings */
949 ofnode_read_u32(np, "gpmc,we-on-ns", &gpmc_t->we_on);
950 ofnode_read_u32(np, "gpmc,we-off-ns", &gpmc_t->we_off);
951
952 /* OE signal timings */
953 ofnode_read_u32(np, "gpmc,oe-on-ns", &gpmc_t->oe_on);
954 ofnode_read_u32(np, "gpmc,oe-off-ns", &gpmc_t->oe_off);
955 ofnode_read_u32(np, "gpmc,oe-aad-mux-on-ns",
956 &gpmc_t->oe_aad_mux_on);
957 ofnode_read_u32(np, "gpmc,oe-aad-mux-off-ns",
958 &gpmc_t->oe_aad_mux_off);
959
960 /* access and cycle timings */
961 ofnode_read_u32(np, "gpmc,page-burst-access-ns",
962 &gpmc_t->page_burst_access);
963 ofnode_read_u32(np, "gpmc,access-ns", &gpmc_t->access);
964 ofnode_read_u32(np, "gpmc,rd-cycle-ns", &gpmc_t->rd_cycle);
965 ofnode_read_u32(np, "gpmc,wr-cycle-ns", &gpmc_t->wr_cycle);
966 ofnode_read_u32(np, "gpmc,bus-turnaround-ns",
967 &gpmc_t->bus_turnaround);
968 ofnode_read_u32(np, "gpmc,cycle2cycle-delay-ns",
969 &gpmc_t->cycle2cycle_delay);
970 ofnode_read_u32(np, "gpmc,wait-monitoring-ns",
971 &gpmc_t->wait_monitoring);
972 ofnode_read_u32(np, "gpmc,clk-activation-ns",
973 &gpmc_t->clk_activation);
974
975 /* only applicable to OMAP3+ */
976 ofnode_read_u32(np, "gpmc,wr-access-ns", &gpmc_t->wr_access);
977 ofnode_read_u32(np, "gpmc,wr-data-mux-bus-ns",
978 &gpmc_t->wr_data_mux_bus);
979
980 /* bool timing parameters */
981 p = &gpmc_t->bool_timings;
982
983 p->cycle2cyclediffcsen =
984 ofnode_read_bool(np, "gpmc,cycle2cycle-diffcsen");
985 p->cycle2cyclesamecsen =
986 ofnode_read_bool(np, "gpmc,cycle2cycle-samecsen");
987 p->we_extra_delay = ofnode_read_bool(np, "gpmc,we-extra-delay");
988 p->oe_extra_delay = ofnode_read_bool(np, "gpmc,oe-extra-delay");
989 p->adv_extra_delay = ofnode_read_bool(np, "gpmc,adv-extra-delay");
990 p->cs_extra_delay = ofnode_read_bool(np, "gpmc,cs-extra-delay");
991 p->time_para_granularity =
992 ofnode_read_bool(np, "gpmc,time-para-granularity");
993}
994
995/**
996 * gpmc_probe_generic_child - configures the gpmc for a child device
997 * @dev: pointer to gpmc platform device
998 * @child: pointer to device-tree node for child device
999 *
1000 * Allocates and configures a GPMC chip-select for a child device.
1001 * Returns 0 on success and appropriate negative error code on failure.
1002 */
1003static int gpmc_probe_generic_child(struct udevice *dev,
1004 ofnode child)
1005{
1006 struct gpmc_settings gpmc_s;
1007 struct gpmc_timings gpmc_t;
1008 struct resource res;
1009 const char *name;
1010 int ret;
1011 u32 val, cs;
1012
1013 if (ofnode_read_u32(child, "reg", &cs) < 0) {
1014 dev_err(dev, "can't get reg property of child %s\n",
1015 ofnode_get_name(child));
1016 return -ENODEV;
1017 }
1018
1019 if (ofnode_read_resource(child, 0, &res) < 0) {
1020 dev_err(dev, "%s has malformed 'reg' property\n",
1021 ofnode_get_name(child));
1022 return -ENODEV;
1023 }
1024
1025 /*
1026 * Check if we have multiple instances of the same device
1027 * on a single chip select. If so, use the already initialized
1028 * timings.
1029 */
1030 name = gpmc_cs_get_name(cs);
1031 if (name && !strcmp(name, ofnode_get_name(child)))
1032 goto no_timings;
1033
1034 ret = gpmc_cs_request(child, cs, &res);
1035 if (ret < 0) {
1036 dev_err(dev, "cannot request GPMC CS %d\n", cs);
1037 return ret;
1038 }
1039 gpmc_cs_set_name(cs, ofnode_get_name(child));
1040
1041 gpmc_read_settings_dt(child, &gpmc_s);
1042 gpmc_read_timings_dt(child, &gpmc_t);
1043
1044 /*
1045 * For some GPMC devices we still need to rely on the bootloader
1046 * timings because the devices can be connected via FPGA.
1047 * REVISIT: Add timing support from slls644g.pdf.
1048 */
1049 if (!gpmc_t.cs_rd_off) {
1050 pr_warn("enable GPMC debug to configure .dts timings for CS%i\n",
1051 cs);
1052 gpmc_cs_show_timings(cs,
1053 "please add GPMC bootloader timings to .dts");
1054 goto no_timings;
1055 }
1056
1057 /* CS must be disabled while making changes to gpmc configuration */
1058 gpmc_cs_disable_mem(cs);
1059
1060 if (!ofnode_read_u32(child, "nand-bus-width", &val)) {
1061 /* NAND specific setup */
1062 ofnode_read_u32(child, "nand-bus-width", &val);
1063 switch (val) {
1064 case 8:
1065 gpmc_s.device_width = GPMC_DEVWIDTH_8BIT;
1066 break;
1067 case 16:
1068 gpmc_s.device_width = GPMC_DEVWIDTH_16BIT;
1069 break;
1070 default:
1071 dev_err(dev, "%s: invalid 'nand-bus-width'\n",
1072 ofnode_get_name(child));
1073 ret = -EINVAL;
1074 goto err;
1075 }
1076
1077 /* disable write protect */
1078 gpmc_configure(GPMC_CONFIG_WP, 0);
1079 gpmc_s.device_nand = true;
1080 } else {
1081 ret = ofnode_read_u32(child, "bank-width",
1082 &gpmc_s.device_width);
1083 if (ret < 0 && !gpmc_s.device_width) {
1084 dev_err(dev,
1085 "%s has no 'gpmc,device-width' property\n",
1086 ofnode_get_name(child));
1087 goto err;
1088 }
1089 }
1090
1091 gpmc_cs_show_timings(cs, "before gpmc_cs_program_settings");
1092
1093 ret = gpmc_cs_program_settings(cs, &gpmc_s);
1094 if (ret < 0)
1095 goto err;
1096
1097 ret = gpmc_cs_set_timings(cs, &gpmc_t, &gpmc_s);
1098 if (ret) {
1099 dev_err(dev, "failed to set gpmc timings for: %s\n",
1100 ofnode_get_name(child));
1101 goto err;
1102 }
1103
1104 /* Clear limited address i.e. enable A26-A11 */
1105 val = gpmc_read_reg(GPMC_CONFIG);
1106 val &= ~GPMC_CONFIG_LIMITEDADDRESS;
1107 gpmc_write_reg(GPMC_CONFIG, val);
1108
1109 /* Enable CS region */
1110 gpmc_cs_enable_mem(cs);
1111
1112no_timings:
1113
1114 return 0;
1115
1116err:
1117 gpmc_cs_free(cs);
1118
1119 return ret;
1120}
1121
1122static void gpmc_probe_dt_children(struct udevice *dev)
1123{
1124 int ret;
1125 ofnode child;
1126
1127 ofnode_for_each_subnode(child, dev_ofnode(dev)) {
1128 ret = gpmc_probe_generic_child(dev, child);
1129 if (ret) {
1130 dev_err(dev, "Cannot parse child %s:%d",
1131 ofnode_get_name(child), ret);
1132 }
1133 }
1134}
1135
1136static int gpmc_parse_dt(struct udevice *dev, struct ti_gpmc *gpmc)
1137{
1138 int ret;
1139 u32 val;
1140
1141 ret = ofnode_read_u32(dev_ofnode(dev), "gpmc,num-cs",
1142 &val);
1143 if (ret < 0) {
1144 pr_err("%s: number of chip-selects not defined\n", __func__);
1145 return ret;
1146 } else if (val < 1) {
1147 pr_err("%s: all chip-selects are disabled\n", __func__);
1148 return -EINVAL;
1149 } else if (val > GPMC_CS_NUM) {
1150 pr_err("%s: number of supported chip-selects cannot be > %d\n",
1151 __func__, GPMC_CS_NUM);
1152 return -EINVAL;
1153 }
1154
1155 gpmc->cs_num = val;
1156 gpmc_cs_num = val;
1157
1158 ret = ofnode_read_u32(dev_ofnode(dev), "gpmc,num-waitpins",
1159 &gpmc->nr_waitpins);
1160 if (ret < 0) {
1161 pr_err("%s: number of wait pins not found!\n", __func__);
1162 return ret;
1163 }
1164
1165 gpmc_nr_waitpins = gpmc->nr_waitpins;
1166
1167 return 0;
1168}
1169
1170static int gpmc_probe(struct udevice *dev)
1171{
1172 struct ti_gpmc *priv = dev_get_priv(dev);
1173 int ret;
1174 struct resource res;
1175
1176 ret = dev_read_resource_byname(dev, "cfg", &res);
1177 if (ret) {
1178 /* Legacy DT */
1179 dev_read_resource(dev, 0, &res);
1180 priv->base = devm_ioremap(dev, res.start, resource_size(&res));
1181
1182 priv->data.start = GPMC_MEM_START;
1183 priv->data.end = GPMC_MEM_END;
1184 } else {
1185 priv->base = devm_ioremap(dev, res.start, resource_size(&res));
1186 ret = dev_read_resource_byname(dev, "data", &res);
1187 if (ret)
1188 return -ENOENT;
1189
1190 priv->data = res;
1191 }
1192
1193 if (!priv->base)
1194 return -ENOMEM;
1195
1196 gpmc_cfg = (struct gpmc *)priv->base;
1197 gpmc_base = priv->base;
1198
1199 priv->l3_clk = devm_clk_get(dev, "fck");
1200 if (IS_ERR(priv->l3_clk))
1201 return PTR_ERR(priv->l3_clk);
1202
1203 if (!clk_get_rate(priv->l3_clk))
1204 return -EINVAL;
1205
1206 gpmc_l3_clk = priv->l3_clk;
1207
1208 ret = gpmc_parse_dt(dev, priv);
1209 if (ret)
1210 return ret;
1211
1212 priv->capability_flags = dev->driver->of_match->data;
1213 gpmc_capability = priv->capability_flags;
1214
1215 gpmc_probe_dt_children(dev);
1216
1217 return 0;
1218}
1219
1220#define GPMC_DATA_REV2_4 0
1221#define GPMC_DATA_REV5 (GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS)
1222#define GPMC_DATA_REV6 (GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS | GPMC_HAS_MUX_AAD)
1223
1224static const struct udevice_id gpmc_dt_ids[] = {
1225 { .compatible = "ti,am64-gpmc", .data = GPMC_DATA_REV6, },
1226 { .compatible = "ti,am3352-gpmc", .data = GPMC_DATA_REV5, },
1227 { .compatible = "ti,omap2420-gpmc", .data = GPMC_DATA_REV2_4, },
1228 { .compatible = "ti,omap2430-gpmc", .data = GPMC_DATA_REV2_4, },
1229 { .compatible = "ti,omap3430-gpmc", .data = GPMC_DATA_REV5, },
1230 { .compatible = "ti,omap4430-gpmc", .data = GPMC_DATA_REV6, },
1231 { } /* sentinel */
1232};
1233
1234U_BOOT_DRIVER(ti_gpmc) = {
1235 .name = "ti-gpmc",
1236 .id = UCLASS_MEMORY,
1237 .of_match = gpmc_dt_ids,
1238 .probe = gpmc_probe,
1239 .flags = DM_FLAG_ALLOC_PRIV_DMA,
1240};