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Linux 4.18.10
[linux/fpc-iii.git] / drivers / memory / omap-gpmc.c
blobc215287e80cf3bbff8d452f53bf097fba39148dd
1 /*
2 * GPMC support functions
3 *
4 * Copyright (C) 2005-2006 Nokia Corporation
5 *
6 * Author: Juha Yrjola
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15 #include <linux/irq.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/err.h>
19 #include <linux/clk.h>
20 #include <linux/ioport.h>
21 #include <linux/spinlock.h>
22 #include <linux/io.h>
23 #include <linux/gpio/driver.h>
24 #include <linux/interrupt.h>
25 #include <linux/irqdomain.h>
26 #include <linux/platform_device.h>
27 #include <linux/of.h>
28 #include <linux/of_address.h>
29 #include <linux/of_device.h>
30 #include <linux/of_platform.h>
31 #include <linux/omap-gpmc.h>
32 #include <linux/pm_runtime.h>
33
34 #include <linux/platform_data/mtd-nand-omap2.h>
35
36 #include <asm/mach-types.h>
37
38 #define DEVICE_NAME "omap-gpmc"
39
40 /* GPMC register offsets */
41 #define GPMC_REVISION 0x00
42 #define GPMC_SYSCONFIG 0x10
43 #define GPMC_SYSSTATUS 0x14
44 #define GPMC_IRQSTATUS 0x18
45 #define GPMC_IRQENABLE 0x1c
46 #define GPMC_TIMEOUT_CONTROL 0x40
47 #define GPMC_ERR_ADDRESS 0x44
48 #define GPMC_ERR_TYPE 0x48
49 #define GPMC_CONFIG 0x50
50 #define GPMC_STATUS 0x54
51 #define GPMC_PREFETCH_CONFIG1 0x1e0
52 #define GPMC_PREFETCH_CONFIG2 0x1e4
53 #define GPMC_PREFETCH_CONTROL 0x1ec
54 #define GPMC_PREFETCH_STATUS 0x1f0
55 #define GPMC_ECC_CONFIG 0x1f4
56 #define GPMC_ECC_CONTROL 0x1f8
57 #define GPMC_ECC_SIZE_CONFIG 0x1fc
58 #define GPMC_ECC1_RESULT 0x200
59 #define GPMC_ECC_BCH_RESULT_0 0x240 /* not available on OMAP2 */
60 #define GPMC_ECC_BCH_RESULT_1 0x244 /* not available on OMAP2 */
61 #define GPMC_ECC_BCH_RESULT_2 0x248 /* not available on OMAP2 */
62 #define GPMC_ECC_BCH_RESULT_3 0x24c /* not available on OMAP2 */
63 #define GPMC_ECC_BCH_RESULT_4 0x300 /* not available on OMAP2 */
64 #define GPMC_ECC_BCH_RESULT_5 0x304 /* not available on OMAP2 */
65 #define GPMC_ECC_BCH_RESULT_6 0x308 /* not available on OMAP2 */
66
67 /* GPMC ECC control settings */
68 #define GPMC_ECC_CTRL_ECCCLEAR 0x100
69 #define GPMC_ECC_CTRL_ECCDISABLE 0x000
70 #define GPMC_ECC_CTRL_ECCREG1 0x001
71 #define GPMC_ECC_CTRL_ECCREG2 0x002
72 #define GPMC_ECC_CTRL_ECCREG3 0x003
73 #define GPMC_ECC_CTRL_ECCREG4 0x004
74 #define GPMC_ECC_CTRL_ECCREG5 0x005
75 #define GPMC_ECC_CTRL_ECCREG6 0x006
76 #define GPMC_ECC_CTRL_ECCREG7 0x007
77 #define GPMC_ECC_CTRL_ECCREG8 0x008
78 #define GPMC_ECC_CTRL_ECCREG9 0x009
79
80 #define GPMC_CONFIG_LIMITEDADDRESS BIT(1)
81
82 #define GPMC_STATUS_EMPTYWRITEBUFFERSTATUS BIT(0)
83
84 #define GPMC_CONFIG2_CSEXTRADELAY BIT(7)
85 #define GPMC_CONFIG3_ADVEXTRADELAY BIT(7)
86 #define GPMC_CONFIG4_OEEXTRADELAY BIT(7)
87 #define GPMC_CONFIG4_WEEXTRADELAY BIT(23)
88 #define GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN BIT(6)
89 #define GPMC_CONFIG6_CYCLE2CYCLESAMECSEN BIT(7)
90
91 #define GPMC_CS0_OFFSET 0x60
92 #define GPMC_CS_SIZE 0x30
93 #define GPMC_BCH_SIZE 0x10
94
95 /*
96 * The first 1MB of GPMC address space is typically mapped to
97 * the internal ROM. Never allocate the first page, to
98 * facilitate bug detection; even if we didn't boot from ROM.
99 * As GPMC minimum partition size is 16MB we can only start from
100 * there.
101 */
102 #define GPMC_MEM_START 0x1000000
103 #define GPMC_MEM_END 0x3FFFFFFF
104
105 #define GPMC_CHUNK_SHIFT 24 /* 16 MB */
106 #define GPMC_SECTION_SHIFT 28 /* 128 MB */
107
108 #define CS_NUM_SHIFT 24
109 #define ENABLE_PREFETCH (0x1 << 7)
110 #define DMA_MPU_MODE 2
111
112 #define GPMC_REVISION_MAJOR(l) ((l >> 4) & 0xf)
113 #define GPMC_REVISION_MINOR(l) (l & 0xf)
114
115 #define GPMC_HAS_WR_ACCESS 0x1
116 #define GPMC_HAS_WR_DATA_MUX_BUS 0x2
117 #define GPMC_HAS_MUX_AAD 0x4
118
119 #define GPMC_NR_WAITPINS 4
120
121 #define GPMC_CS_CONFIG1 0x00
122 #define GPMC_CS_CONFIG2 0x04
123 #define GPMC_CS_CONFIG3 0x08
124 #define GPMC_CS_CONFIG4 0x0c
125 #define GPMC_CS_CONFIG5 0x10
126 #define GPMC_CS_CONFIG6 0x14
127 #define GPMC_CS_CONFIG7 0x18
128 #define GPMC_CS_NAND_COMMAND 0x1c
129 #define GPMC_CS_NAND_ADDRESS 0x20
130 #define GPMC_CS_NAND_DATA 0x24
131
132 /* Control Commands */
133 #define GPMC_CONFIG_RDY_BSY 0x00000001
134 #define GPMC_CONFIG_DEV_SIZE 0x00000002
135 #define GPMC_CONFIG_DEV_TYPE 0x00000003
136
137 #define GPMC_CONFIG1_WRAPBURST_SUPP (1 << 31)
138 #define GPMC_CONFIG1_READMULTIPLE_SUPP (1 << 30)
139 #define GPMC_CONFIG1_READTYPE_ASYNC (0 << 29)
140 #define GPMC_CONFIG1_READTYPE_SYNC (1 << 29)
141 #define GPMC_CONFIG1_WRITEMULTIPLE_SUPP (1 << 28)
142 #define GPMC_CONFIG1_WRITETYPE_ASYNC (0 << 27)
143 #define GPMC_CONFIG1_WRITETYPE_SYNC (1 << 27)
144 #define GPMC_CONFIG1_CLKACTIVATIONTIME(val) ((val & 3) << 25)
145 /** CLKACTIVATIONTIME Max Ticks */
146 #define GPMC_CONFIG1_CLKACTIVATIONTIME_MAX 2
147 #define GPMC_CONFIG1_PAGE_LEN(val) ((val & 3) << 23)
148 /** ATTACHEDDEVICEPAGELENGTH Max Value */
149 #define GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX 2
150 #define GPMC_CONFIG1_WAIT_READ_MON (1 << 22)
151 #define GPMC_CONFIG1_WAIT_WRITE_MON (1 << 21)
152 #define GPMC_CONFIG1_WAIT_MON_TIME(val) ((val & 3) << 18)
153 /** WAITMONITORINGTIME Max Ticks */
154 #define GPMC_CONFIG1_WAITMONITORINGTIME_MAX 2
155 #define GPMC_CONFIG1_WAIT_PIN_SEL(val) ((val & 3) << 16)
156 #define GPMC_CONFIG1_DEVICESIZE(val) ((val & 3) << 12)
157 #define GPMC_CONFIG1_DEVICESIZE_16 GPMC_CONFIG1_DEVICESIZE(1)
158 /** DEVICESIZE Max Value */
159 #define GPMC_CONFIG1_DEVICESIZE_MAX 1
160 #define GPMC_CONFIG1_DEVICETYPE(val) ((val & 3) << 10)
161 #define GPMC_CONFIG1_DEVICETYPE_NOR GPMC_CONFIG1_DEVICETYPE(0)
162 #define GPMC_CONFIG1_MUXTYPE(val) ((val & 3) << 8)
163 #define GPMC_CONFIG1_TIME_PARA_GRAN (1 << 4)
164 #define GPMC_CONFIG1_FCLK_DIV(val) (val & 3)
165 #define GPMC_CONFIG1_FCLK_DIV2 (GPMC_CONFIG1_FCLK_DIV(1))
166 #define GPMC_CONFIG1_FCLK_DIV3 (GPMC_CONFIG1_FCLK_DIV(2))
167 #define GPMC_CONFIG1_FCLK_DIV4 (GPMC_CONFIG1_FCLK_DIV(3))
168 #define GPMC_CONFIG7_CSVALID (1 << 6)
169
170 #define GPMC_CONFIG7_BASEADDRESS_MASK 0x3f
171 #define GPMC_CONFIG7_CSVALID_MASK BIT(6)
172 #define GPMC_CONFIG7_MASKADDRESS_OFFSET 8
173 #define GPMC_CONFIG7_MASKADDRESS_MASK (0xf << GPMC_CONFIG7_MASKADDRESS_OFFSET)
174 /* All CONFIG7 bits except reserved bits */
175 #define GPMC_CONFIG7_MASK (GPMC_CONFIG7_BASEADDRESS_MASK | \
176 GPMC_CONFIG7_CSVALID_MASK | \
177 GPMC_CONFIG7_MASKADDRESS_MASK)
178
179 #define GPMC_DEVICETYPE_NOR 0
180 #define GPMC_DEVICETYPE_NAND 2
181 #define GPMC_CONFIG_WRITEPROTECT 0x00000010
182 #define WR_RD_PIN_MONITORING 0x00600000
183
184 /* ECC commands */
185 #define GPMC_ECC_READ 0 /* Reset Hardware ECC for read */
186 #define GPMC_ECC_WRITE 1 /* Reset Hardware ECC for write */
187 #define GPMC_ECC_READSYN 2 /* Reset before syndrom is read back */
188
189 #define GPMC_NR_NAND_IRQS 2 /* number of NAND specific IRQs */
190
191 enum gpmc_clk_domain {
192 GPMC_CD_FCLK,
193 GPMC_CD_CLK
194 };
195
196 struct gpmc_cs_data {
197 const char *name;
198
199 #define GPMC_CS_RESERVED (1 << 0)
200 u32 flags;
201
202 struct resource mem;
203 };
204
205 /* Structure to save gpmc cs context */
206 struct gpmc_cs_config {
207 u32 config1;
208 u32 config2;
209 u32 config3;
210 u32 config4;
211 u32 config5;
212 u32 config6;
213 u32 config7;
214 int is_valid;
215 };
216
217 /*
218 * Structure to save/restore gpmc context
219 * to support core off on OMAP3
220 */
221 struct omap3_gpmc_regs {
222 u32 sysconfig;
223 u32 irqenable;
224 u32 timeout_ctrl;
225 u32 config;
226 u32 prefetch_config1;
227 u32 prefetch_config2;
228 u32 prefetch_control;
229 struct gpmc_cs_config cs_context[GPMC_CS_NUM];
230 };
231
232 struct gpmc_device {
233 struct device *dev;
234 int irq;
235 struct irq_chip irq_chip;
236 struct gpio_chip gpio_chip;
237 int nirqs;
238 };
239
240 static struct irq_domain *gpmc_irq_domain;
241
242 static struct resource gpmc_mem_root;
243 static struct gpmc_cs_data gpmc_cs[GPMC_CS_NUM];
244 static DEFINE_SPINLOCK(gpmc_mem_lock);
245 /* Define chip-selects as reserved by default until probe completes */
246 static unsigned int gpmc_cs_num = GPMC_CS_NUM;
247 static unsigned int gpmc_nr_waitpins;
248 static resource_size_t phys_base, mem_size;
249 static unsigned gpmc_capability;
250 static void __iomem *gpmc_base;
251
252 static struct clk *gpmc_l3_clk;
253
254 static irqreturn_t gpmc_handle_irq(int irq, void *dev);
255
256 static void gpmc_write_reg(int idx, u32 val)
257 {
258 writel_relaxed(val, gpmc_base + idx);
259 }
260
261 static u32 gpmc_read_reg(int idx)
262 {
263 return readl_relaxed(gpmc_base + idx);
264 }
265
266 void gpmc_cs_write_reg(int cs, int idx, u32 val)
267 {
268 void __iomem *reg_addr;
269
270 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
271 writel_relaxed(val, reg_addr);
272 }
273
274 static u32 gpmc_cs_read_reg(int cs, int idx)
275 {
276 void __iomem *reg_addr;
277
278 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
279 return readl_relaxed(reg_addr);
280 }
281
282 /* TODO: Add support for gpmc_fck to clock framework and use it */
283 static unsigned long gpmc_get_fclk_period(void)
284 {
285 unsigned long rate = clk_get_rate(gpmc_l3_clk);
286
287 rate /= 1000;
288 rate = 1000000000 / rate; /* In picoseconds */
289
290 return rate;
291 }
292
293 /**
294 * gpmc_get_clk_period - get period of selected clock domain in ps
295 * @cs Chip Select Region.
296 * @cd Clock Domain.
297 *
298 * GPMC_CS_CONFIG1 GPMCFCLKDIVIDER for cs has to be setup
299 * prior to calling this function with GPMC_CD_CLK.
300 */
301 static unsigned long gpmc_get_clk_period(int cs, enum gpmc_clk_domain cd)
302 {
303
304 unsigned long tick_ps = gpmc_get_fclk_period();
305 u32 l;
306 int div;
307
308 switch (cd) {
309 case GPMC_CD_CLK:
310 /* get current clk divider */
311 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
312 div = (l & 0x03) + 1;
313 /* get GPMC_CLK period */
314 tick_ps *= div;
315 break;
316 case GPMC_CD_FCLK:
317 /* FALL-THROUGH */
318 default:
319 break;
320 }
321
322 return tick_ps;
323
324 }
325
326 static unsigned int gpmc_ns_to_clk_ticks(unsigned int time_ns, int cs,
327 enum gpmc_clk_domain cd)
328 {
329 unsigned long tick_ps;
330
331 /* Calculate in picosecs to yield more exact results */
332 tick_ps = gpmc_get_clk_period(cs, cd);
333
334 return (time_ns * 1000 + tick_ps - 1) / tick_ps;
335 }
336
337 static unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
338 {
339 return gpmc_ns_to_clk_ticks(time_ns, /* any CS */ 0, GPMC_CD_FCLK);
340 }
341
342 static unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
343 {
344 unsigned long tick_ps;
345
346 /* Calculate in picosecs to yield more exact results */
347 tick_ps = gpmc_get_fclk_period();
348
349 return (time_ps + tick_ps - 1) / tick_ps;
350 }
351
352 static unsigned int gpmc_clk_ticks_to_ns(unsigned int ticks, int cs,
353 enum gpmc_clk_domain cd)
354 {
355 return ticks * gpmc_get_clk_period(cs, cd) / 1000;
356 }
357
358 unsigned int gpmc_ticks_to_ns(unsigned int ticks)
359 {
360 return gpmc_clk_ticks_to_ns(ticks, /* any CS */ 0, GPMC_CD_FCLK);
361 }
362
363 static unsigned int gpmc_ticks_to_ps(unsigned int ticks)
364 {
365 return ticks * gpmc_get_fclk_period();
366 }
367
368 static unsigned int gpmc_round_ps_to_ticks(unsigned int time_ps)
369 {
370 unsigned long ticks = gpmc_ps_to_ticks(time_ps);
371
372 return ticks * gpmc_get_fclk_period();
373 }
374
375 static inline void gpmc_cs_modify_reg(int cs, int reg, u32 mask, bool value)
376 {
377 u32 l;
378
379 l = gpmc_cs_read_reg(cs, reg);
380 if (value)
381 l |= mask;
382 else
383 l &= ~mask;
384 gpmc_cs_write_reg(cs, reg, l);
385 }
386
387 static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p)
388 {
389 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG1,
390 GPMC_CONFIG1_TIME_PARA_GRAN,
391 p->time_para_granularity);
392 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG2,
393 GPMC_CONFIG2_CSEXTRADELAY, p->cs_extra_delay);
394 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG3,
395 GPMC_CONFIG3_ADVEXTRADELAY, p->adv_extra_delay);
396 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
397 GPMC_CONFIG4_OEEXTRADELAY, p->oe_extra_delay);
398 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
399 GPMC_CONFIG4_WEEXTRADELAY, p->we_extra_delay);
400 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
401 GPMC_CONFIG6_CYCLE2CYCLESAMECSEN,
402 p->cycle2cyclesamecsen);
403 gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
404 GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN,
405 p->cycle2cyclediffcsen);
406 }
407
408 #ifdef CONFIG_OMAP_GPMC_DEBUG
409 /**
410 * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it.
411 * @cs: Chip Select Region
412 * @reg: GPMC_CS_CONFIGn register offset.
413 * @st_bit: Start Bit
414 * @end_bit: End Bit. Must be >= @st_bit.
415 * @ma:x Maximum parameter value (before optional @shift).
416 * If 0, maximum is as high as @st_bit and @end_bit allow.
417 * @name: DTS node name, w/o "gpmc,"
418 * @cd: Clock Domain of timing parameter.
419 * @shift: Parameter value left shifts @shift, which is then printed instead of value.
420 * @raw: Raw Format Option.
421 * raw format: gpmc,name = <value>
422 * tick format: gpmc,name = <value> /&zwj;* x ns -- y ns; x ticks *&zwj;/
423 * Where x ns -- y ns result in the same tick value.
424 * When @max is exceeded, "invalid" is printed inside comment.
425 * @noval: Parameter values equal to 0 are not printed.
426 * @return: Specified timing parameter (after optional @shift).
427 *
428 */
429 static int get_gpmc_timing_reg(
430 /* timing specifiers */
431 int cs, int reg, int st_bit, int end_bit, int max,
432 const char *name, const enum gpmc_clk_domain cd,
433 /* value transform */
434 int shift,
435 /* format specifiers */
436 bool raw, bool noval)
437 {
438 u32 l;
439 int nr_bits;
440 int mask;
441 bool invalid;
442
443 l = gpmc_cs_read_reg(cs, reg);
444 nr_bits = end_bit - st_bit + 1;
445 mask = (1 << nr_bits) - 1;
446 l = (l >> st_bit) & mask;
447 if (!max)
448 max = mask;
449 invalid = l > max;
450 if (shift)
451 l = (shift << l);
452 if (noval && (l == 0))
453 return 0;
454 if (!raw) {
455 /* DTS tick format for timings in ns */
456 unsigned int time_ns;
457 unsigned int time_ns_min = 0;
458
459 if (l)
460 time_ns_min = gpmc_clk_ticks_to_ns(l - 1, cs, cd) + 1;
461 time_ns = gpmc_clk_ticks_to_ns(l, cs, cd);
462 pr_info("gpmc,%s = <%u>; /* %u ns - %u ns; %i ticks%s*/\n",
463 name, time_ns, time_ns_min, time_ns, l,
464 invalid ? "; invalid " : " ");
465 } else {
466 /* raw format */
467 pr_info("gpmc,%s = <%u>;%s\n", name, l,
468 invalid ? " /* invalid */" : "");
469 }
470
471 return l;
472 }
473
474 #define GPMC_PRINT_CONFIG(cs, config) \
475 pr_info("cs%i %s: 0x%08x\n", cs, #config, \
476 gpmc_cs_read_reg(cs, config))
477 #define GPMC_GET_RAW(reg, st, end, field) \
478 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 0)
479 #define GPMC_GET_RAW_MAX(reg, st, end, max, field) \
480 get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, 0, 1, 0)
481 #define GPMC_GET_RAW_BOOL(reg, st, end, field) \
482 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 1)
483 #define GPMC_GET_RAW_SHIFT_MAX(reg, st, end, shift, max, field) \
484 get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, (shift), 1, 1)
485 #define GPMC_GET_TICKS(reg, st, end, field) \
486 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 0, 0)
487 #define GPMC_GET_TICKS_CD(reg, st, end, field, cd) \
488 get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, (cd), 0, 0, 0)
489 #define GPMC_GET_TICKS_CD_MAX(reg, st, end, max, field, cd) \
490 get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, (cd), 0, 0, 0)
491
492 static void gpmc_show_regs(int cs, const char *desc)
493 {
494 pr_info("gpmc cs%i %s:\n", cs, desc);
495 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG1);
496 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG2);
497 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG3);
498 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG4);
499 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG5);
500 GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG6);
501 }
502
503 /*
504 * Note that gpmc,wait-pin handing wrongly assumes bit 8 is available,
505 * see commit c9fb809.
506 */
507 static void gpmc_cs_show_timings(int cs, const char *desc)
508 {
509 gpmc_show_regs(cs, desc);
510
511 pr_info("gpmc cs%i access configuration:\n", cs);
512 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 4, 4, "time-para-granularity");
513 GPMC_GET_RAW(GPMC_CS_CONFIG1, 8, 9, "mux-add-data");
514 GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 12, 13, 1,
515 GPMC_CONFIG1_DEVICESIZE_MAX, "device-width");
516 GPMC_GET_RAW(GPMC_CS_CONFIG1, 16, 17, "wait-pin");
517 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 21, 21, "wait-on-write");
518 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 22, 22, "wait-on-read");
519 GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 23, 24, 4,
520 GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX,
521 "burst-length");
522 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 27, 27, "sync-write");
523 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 28, 28, "burst-write");
524 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 29, 29, "gpmc,sync-read");
525 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 30, 30, "burst-read");
526 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 31, 31, "burst-wrap");
527
528 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG2, 7, 7, "cs-extra-delay");
529
530 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG3, 7, 7, "adv-extra-delay");
531
532 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG4, 23, 23, "we-extra-delay");
533 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG4, 7, 7, "oe-extra-delay");
534
535 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG6, 7, 7, "cycle2cycle-samecsen");
536 GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG6, 6, 6, "cycle2cycle-diffcsen");
537
538 pr_info("gpmc cs%i timings configuration:\n", cs);
539 GPMC_GET_TICKS(GPMC_CS_CONFIG2, 0, 3, "cs-on-ns");
540 GPMC_GET_TICKS(GPMC_CS_CONFIG2, 8, 12, "cs-rd-off-ns");
541 GPMC_GET_TICKS(GPMC_CS_CONFIG2, 16, 20, "cs-wr-off-ns");
542
543 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 0, 3, "adv-on-ns");
544 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 8, 12, "adv-rd-off-ns");
545 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 16, 20, "adv-wr-off-ns");
546 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
547 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 4, 6, "adv-aad-mux-on-ns");
548 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 24, 26,
549 "adv-aad-mux-rd-off-ns");
550 GPMC_GET_TICKS(GPMC_CS_CONFIG3, 28, 30,
551 "adv-aad-mux-wr-off-ns");
552 }
553
554 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 0, 3, "oe-on-ns");
555 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 8, 12, "oe-off-ns");
556 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
557 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 4, 6, "oe-aad-mux-on-ns");
558 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 13, 15, "oe-aad-mux-off-ns");
559 }
560 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 16, 19, "we-on-ns");
561 GPMC_GET_TICKS(GPMC_CS_CONFIG4, 24, 28, "we-off-ns");
562
563 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 0, 4, "rd-cycle-ns");
564 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 8, 12, "wr-cycle-ns");
565 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 16, 20, "access-ns");
566
567 GPMC_GET_TICKS(GPMC_CS_CONFIG5, 24, 27, "page-burst-access-ns");
568
569 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 0, 3, "bus-turnaround-ns");
570 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 8, 11, "cycle2cycle-delay-ns");
571
572 GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 18, 19,
573 GPMC_CONFIG1_WAITMONITORINGTIME_MAX,
574 "wait-monitoring-ns", GPMC_CD_CLK);
575 GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 25, 26,
576 GPMC_CONFIG1_CLKACTIVATIONTIME_MAX,
577 "clk-activation-ns", GPMC_CD_FCLK);
578
579 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 16, 19, "wr-data-mux-bus-ns");
580 GPMC_GET_TICKS(GPMC_CS_CONFIG6, 24, 28, "wr-access-ns");
581 }
582 #else
583 static inline void gpmc_cs_show_timings(int cs, const char *desc)
584 {
585 }
586 #endif
587
588 /**
589 * set_gpmc_timing_reg - set a single timing parameter for Chip Select Region.
590 * Caller is expected to have initialized CONFIG1 GPMCFCLKDIVIDER
591 * prior to calling this function with @cd equal to GPMC_CD_CLK.
592 *
593 * @cs: Chip Select Region.
594 * @reg: GPMC_CS_CONFIGn register offset.
595 * @st_bit: Start Bit
596 * @end_bit: End Bit. Must be >= @st_bit.
597 * @max: Maximum parameter value.
598 * If 0, maximum is as high as @st_bit and @end_bit allow.
599 * @time: Timing parameter in ns.
600 * @cd: Timing parameter clock domain.
601 * @name: Timing parameter name.
602 * @return: 0 on success, -1 on error.
603 */
604 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, int max,
605 int time, enum gpmc_clk_domain cd, const char *name)
606 {
607 u32 l;
608 int ticks, mask, nr_bits;
609
610 if (time == 0)
611 ticks = 0;
612 else
613 ticks = gpmc_ns_to_clk_ticks(time, cs, cd);
614 nr_bits = end_bit - st_bit + 1;
615 mask = (1 << nr_bits) - 1;
616
617 if (!max)
618 max = mask;
619
620 if (ticks > max) {
621 pr_err("%s: GPMC CS%d: %s %d ns, %d ticks > %d ticks\n",
622 __func__, cs, name, time, ticks, max);
623
624 return -1;
625 }
626
627 l = gpmc_cs_read_reg(cs, reg);
628 #ifdef CONFIG_OMAP_GPMC_DEBUG
629 pr_info(
630 "GPMC CS%d: %-17s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
631 cs, name, ticks, gpmc_get_clk_period(cs, cd) * ticks / 1000,
632 (l >> st_bit) & mask, time);
633 #endif
634 l &= ~(mask << st_bit);
635 l |= ticks << st_bit;
636 gpmc_cs_write_reg(cs, reg, l);
637
638 return 0;
639 }
640
641 #define GPMC_SET_ONE_CD_MAX(reg, st, end, max, field, cd) \
642 if (set_gpmc_timing_reg(cs, (reg), (st), (end), (max), \
643 t->field, (cd), #field) < 0) \
644 return -1
645
646 #define GPMC_SET_ONE(reg, st, end, field) \
647 GPMC_SET_ONE_CD_MAX(reg, st, end, 0, field, GPMC_CD_FCLK)
648
649 /**
650 * gpmc_calc_waitmonitoring_divider - calculate proper GPMCFCLKDIVIDER based on WAITMONITORINGTIME
651 * WAITMONITORINGTIME will be _at least_ as long as desired, i.e.
652 * read --> don't sample bus too early
653 * write --> data is longer on bus
654 *
655 * Formula:
656 * gpmc_clk_div + 1 = ceil(ceil(waitmonitoringtime_ns / gpmc_fclk_ns)
657 * / waitmonitoring_ticks)
658 * WAITMONITORINGTIME resulting in 0 or 1 tick with div = 1 are caught by
659 * div <= 0 check.
660 *
661 * @wait_monitoring: WAITMONITORINGTIME in ns.
662 * @return: -1 on failure to scale, else proper divider > 0.
663 */
664 static int gpmc_calc_waitmonitoring_divider(unsigned int wait_monitoring)
665 {
666
667 int div = gpmc_ns_to_ticks(wait_monitoring);
668
669 div += GPMC_CONFIG1_WAITMONITORINGTIME_MAX - 1;
670 div /= GPMC_CONFIG1_WAITMONITORINGTIME_MAX;
671
672 if (div > 4)
673 return -1;
674 if (div <= 0)
675 div = 1;
676
677 return div;
678
679 }
680
681 /**
682 * gpmc_calc_divider - calculate GPMC_FCLK divider for sync_clk GPMC_CLK period.
683 * @sync_clk: GPMC_CLK period in ps.
684 * @return: Returns at least 1 if GPMC_FCLK can be divided to GPMC_CLK.
685 * Else, returns -1.
686 */
687 int gpmc_calc_divider(unsigned int sync_clk)
688 {
689 int div = gpmc_ps_to_ticks(sync_clk);
690
691 if (div > 4)
692 return -1;
693 if (div <= 0)
694 div = 1;
695
696 return div;
697 }
698
699 /**
700 * gpmc_cs_set_timings - program timing parameters for Chip Select Region.
701 * @cs: Chip Select Region.
702 * @t: GPMC timing parameters.
703 * @s: GPMC timing settings.
704 * @return: 0 on success, -1 on error.
705 */
706 int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t,
707 const struct gpmc_settings *s)
708 {
709 int div;
710 u32 l;
711
712 div = gpmc_calc_divider(t->sync_clk);
713 if (div < 0)
714 return div;
715
716 /*
717 * See if we need to change the divider for waitmonitoringtime.
718 *
719 * Calculate GPMCFCLKDIVIDER independent of gpmc,sync-clk-ps in DT for
720 * pure asynchronous accesses, i.e. both read and write asynchronous.
721 * However, only do so if WAITMONITORINGTIME is actually used, i.e.
722 * either WAITREADMONITORING or WAITWRITEMONITORING is set.
723 *
724 * This statement must not change div to scale async WAITMONITORINGTIME
725 * to protect mixed synchronous and asynchronous accesses.
726 *
727 * We raise an error later if WAITMONITORINGTIME does not fit.
728 */
729 if (!s->sync_read && !s->sync_write &&
730 (s->wait_on_read || s->wait_on_write)
731 ) {
732
733 div = gpmc_calc_waitmonitoring_divider(t->wait_monitoring);
734 if (div < 0) {
735 pr_err("%s: waitmonitoringtime %3d ns too large for greatest gpmcfclkdivider.\n",
736 __func__,
737 t->wait_monitoring
738 );
739 return -1;
740 }
741 }
742
743 GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
744 GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
745 GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
746
747 GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
748 GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
749 GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
750 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
751 GPMC_SET_ONE(GPMC_CS_CONFIG3, 4, 6, adv_aad_mux_on);
752 GPMC_SET_ONE(GPMC_CS_CONFIG3, 24, 26, adv_aad_mux_rd_off);
753 GPMC_SET_ONE(GPMC_CS_CONFIG3, 28, 30, adv_aad_mux_wr_off);
754 }
755
756 GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
757 GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
758 if (gpmc_capability & GPMC_HAS_MUX_AAD) {
759 GPMC_SET_ONE(GPMC_CS_CONFIG4, 4, 6, oe_aad_mux_on);
760 GPMC_SET_ONE(GPMC_CS_CONFIG4, 13, 15, oe_aad_mux_off);
761 }
762 GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
763 GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
764
765 GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
766 GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
767 GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
768
769 GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
770
771 GPMC_SET_ONE(GPMC_CS_CONFIG6, 0, 3, bus_turnaround);
772 GPMC_SET_ONE(GPMC_CS_CONFIG6, 8, 11, cycle2cycle_delay);
773
774 if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
775 GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
776 if (gpmc_capability & GPMC_HAS_WR_ACCESS)
777 GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
778
779 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
780 l &= ~0x03;
781 l |= (div - 1);
782 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
783
784 GPMC_SET_ONE_CD_MAX(GPMC_CS_CONFIG1, 18, 19,
785 GPMC_CONFIG1_WAITMONITORINGTIME_MAX,
786 wait_monitoring, GPMC_CD_CLK);
787 GPMC_SET_ONE_CD_MAX(GPMC_CS_CONFIG1, 25, 26,
788 GPMC_CONFIG1_CLKACTIVATIONTIME_MAX,
789 clk_activation, GPMC_CD_FCLK);
790
791 #ifdef CONFIG_OMAP_GPMC_DEBUG
792 pr_info("GPMC CS%d CLK period is %lu ns (div %d)\n",
793 cs, (div * gpmc_get_fclk_period()) / 1000, div);
794 #endif
795
796 gpmc_cs_bool_timings(cs, &t->bool_timings);
797 gpmc_cs_show_timings(cs, "after gpmc_cs_set_timings");
798
799 return 0;
800 }
801
802 static int gpmc_cs_set_memconf(int cs, u32 base, u32 size)
803 {
804 u32 l;
805 u32 mask;
806
807 /*
808 * Ensure that base address is aligned on a
809 * boundary equal to or greater than size.
810 */
811 if (base & (size - 1))
812 return -EINVAL;
813
814 base >>= GPMC_CHUNK_SHIFT;
815 mask = (1 << GPMC_SECTION_SHIFT) - size;
816 mask >>= GPMC_CHUNK_SHIFT;
817 mask <<= GPMC_CONFIG7_MASKADDRESS_OFFSET;
818
819 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
820 l &= ~GPMC_CONFIG7_MASK;
821 l |= base & GPMC_CONFIG7_BASEADDRESS_MASK;
822 l |= mask & GPMC_CONFIG7_MASKADDRESS_MASK;
823 l |= GPMC_CONFIG7_CSVALID;
824 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
825
826 return 0;
827 }
828
829 static void gpmc_cs_enable_mem(int cs)
830 {
831 u32 l;
832
833 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
834 l |= GPMC_CONFIG7_CSVALID;
835 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
836 }
837
838 static void gpmc_cs_disable_mem(int cs)
839 {
840 u32 l;
841
842 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
843 l &= ~GPMC_CONFIG7_CSVALID;
844 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
845 }
846
847 static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
848 {
849 u32 l;
850 u32 mask;
851
852 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
853 *base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
854 mask = (l >> 8) & 0x0f;
855 *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
856 }
857
858 static int gpmc_cs_mem_enabled(int cs)
859 {
860 u32 l;
861
862 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
863 return l & GPMC_CONFIG7_CSVALID;
864 }
865
866 static void gpmc_cs_set_reserved(int cs, int reserved)
867 {
868 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
869
870 gpmc->flags |= GPMC_CS_RESERVED;
871 }
872
873 static bool gpmc_cs_reserved(int cs)
874 {
875 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
876
877 return gpmc->flags & GPMC_CS_RESERVED;
878 }
879
880 static void gpmc_cs_set_name(int cs, const char *name)
881 {
882 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
883
884 gpmc->name = name;
885 }
886
887 static const char *gpmc_cs_get_name(int cs)
888 {
889 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
890
891 return gpmc->name;
892 }
893
894 static unsigned long gpmc_mem_align(unsigned long size)
895 {
896 int order;
897
898 size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
899 order = GPMC_CHUNK_SHIFT - 1;
900 do {
901 size >>= 1;
902 order++;
903 } while (size);
904 size = 1 << order;
905 return size;
906 }
907
908 static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
909 {
910 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
911 struct resource *res = &gpmc->mem;
912 int r;
913
914 size = gpmc_mem_align(size);
915 spin_lock(&gpmc_mem_lock);
916 res->start = base;
917 res->end = base + size - 1;
918 r = request_resource(&gpmc_mem_root, res);
919 spin_unlock(&gpmc_mem_lock);
920
921 return r;
922 }
923
924 static int gpmc_cs_delete_mem(int cs)
925 {
926 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
927 struct resource *res = &gpmc->mem;
928 int r;
929
930 spin_lock(&gpmc_mem_lock);
931 r = release_resource(res);
932 res->start = 0;
933 res->end = 0;
934 spin_unlock(&gpmc_mem_lock);
935
936 return r;
937 }
938
939 /**
940 * gpmc_cs_remap - remaps a chip-select physical base address
941 * @cs: chip-select to remap
942 * @base: physical base address to re-map chip-select to
943 *
944 * Re-maps a chip-select to a new physical base address specified by
945 * "base". Returns 0 on success and appropriate negative error code
946 * on failure.
947 */
948 static int gpmc_cs_remap(int cs, u32 base)
949 {
950 int ret;
951 u32 old_base, size;
952
953 if (cs > gpmc_cs_num) {
954 pr_err("%s: requested chip-select is disabled\n", __func__);
955 return -ENODEV;
956 }
957
958 /*
959 * Make sure we ignore any device offsets from the GPMC partition
960 * allocated for the chip select and that the new base confirms
961 * to the GPMC 16MB minimum granularity.
962 */
963 base &= ~(SZ_16M - 1);
964
965 gpmc_cs_get_memconf(cs, &old_base, &size);
966 if (base == old_base)
967 return 0;
968
969 ret = gpmc_cs_delete_mem(cs);
970 if (ret < 0)
971 return ret;
972
973 ret = gpmc_cs_insert_mem(cs, base, size);
974 if (ret < 0)
975 return ret;
976
977 ret = gpmc_cs_set_memconf(cs, base, size);
978
979 return ret;
980 }
981
982 int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
983 {
984 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
985 struct resource *res = &gpmc->mem;
986 int r = -1;
987
988 if (cs > gpmc_cs_num) {
989 pr_err("%s: requested chip-select is disabled\n", __func__);
990 return -ENODEV;
991 }
992 size = gpmc_mem_align(size);
993 if (size > (1 << GPMC_SECTION_SHIFT))
994 return -ENOMEM;
995
996 spin_lock(&gpmc_mem_lock);
997 if (gpmc_cs_reserved(cs)) {
998 r = -EBUSY;
999 goto out;
1000 }
1001 if (gpmc_cs_mem_enabled(cs))
1002 r = adjust_resource(res, res->start & ~(size - 1), size);
1003 if (r < 0)
1004 r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
1005 size, NULL, NULL);
1006 if (r < 0)
1007 goto out;
1008
1009 /* Disable CS while changing base address and size mask */
1010 gpmc_cs_disable_mem(cs);
1011
1012 r = gpmc_cs_set_memconf(cs, res->start, resource_size(res));
1013 if (r < 0) {
1014 release_resource(res);
1015 goto out;
1016 }
1017
1018 /* Enable CS */
1019 gpmc_cs_enable_mem(cs);
1020 *base = res->start;
1021 gpmc_cs_set_reserved(cs, 1);
1022 out:
1023 spin_unlock(&gpmc_mem_lock);
1024 return r;
1025 }
1026 EXPORT_SYMBOL(gpmc_cs_request);
1027
1028 void gpmc_cs_free(int cs)
1029 {
1030 struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
1031 struct resource *res = &gpmc->mem;
1032
1033 spin_lock(&gpmc_mem_lock);
1034 if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) {
1035 printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
1036 BUG();
1037 spin_unlock(&gpmc_mem_lock);
1038 return;
1039 }
1040 gpmc_cs_disable_mem(cs);
1041 if (res->flags)
1042 release_resource(res);
1043 gpmc_cs_set_reserved(cs, 0);
1044 spin_unlock(&gpmc_mem_lock);
1045 }
1046 EXPORT_SYMBOL(gpmc_cs_free);
1047
1048 /**
1049 * gpmc_configure - write request to configure gpmc
1050 * @cmd: command type
1051 * @wval: value to write
1052 * @return status of the operation
1053 */
1054 int gpmc_configure(int cmd, int wval)
1055 {
1056 u32 regval;
1057
1058 switch (cmd) {
1059 case GPMC_CONFIG_WP:
1060 regval = gpmc_read_reg(GPMC_CONFIG);
1061 if (wval)
1062 regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
1063 else
1064 regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */
1065 gpmc_write_reg(GPMC_CONFIG, regval);
1066 break;
1067
1068 default:
1069 pr_err("%s: command not supported\n", __func__);
1070 return -EINVAL;
1071 }
1072
1073 return 0;
1074 }
1075 EXPORT_SYMBOL(gpmc_configure);
1076
1077 static bool gpmc_nand_writebuffer_empty(void)
1078 {
1079 if (gpmc_read_reg(GPMC_STATUS) & GPMC_STATUS_EMPTYWRITEBUFFERSTATUS)
1080 return true;
1081
1082 return false;
1083 }
1084
1085 static struct gpmc_nand_ops nand_ops = {
1086 .nand_writebuffer_empty = gpmc_nand_writebuffer_empty,
1087 };
1088
1089 /**
1090 * gpmc_omap_get_nand_ops - Get the GPMC NAND interface
1091 * @regs: the GPMC NAND register map exclusive for NAND use.
1092 * @cs: GPMC chip select number on which the NAND sits. The
1093 * register map returned will be specific to this chip select.
1094 *
1095 * Returns NULL on error e.g. invalid cs.
1096 */
1097 struct gpmc_nand_ops *gpmc_omap_get_nand_ops(struct gpmc_nand_regs *reg, int cs)
1098 {
1099 int i;
1100
1101 if (cs >= gpmc_cs_num)
1102 return NULL;
1103
1104 reg->gpmc_nand_command = gpmc_base + GPMC_CS0_OFFSET +
1105 GPMC_CS_NAND_COMMAND + GPMC_CS_SIZE * cs;
1106 reg->gpmc_nand_address = gpmc_base + GPMC_CS0_OFFSET +
1107 GPMC_CS_NAND_ADDRESS + GPMC_CS_SIZE * cs;
1108 reg->gpmc_nand_data = gpmc_base + GPMC_CS0_OFFSET +
1109 GPMC_CS_NAND_DATA + GPMC_CS_SIZE * cs;
1110 reg->gpmc_prefetch_config1 = gpmc_base + GPMC_PREFETCH_CONFIG1;
1111 reg->gpmc_prefetch_config2 = gpmc_base + GPMC_PREFETCH_CONFIG2;
1112 reg->gpmc_prefetch_control = gpmc_base + GPMC_PREFETCH_CONTROL;
1113 reg->gpmc_prefetch_status = gpmc_base + GPMC_PREFETCH_STATUS;
1114 reg->gpmc_ecc_config = gpmc_base + GPMC_ECC_CONFIG;
1115 reg->gpmc_ecc_control = gpmc_base + GPMC_ECC_CONTROL;
1116 reg->gpmc_ecc_size_config = gpmc_base + GPMC_ECC_SIZE_CONFIG;
1117 reg->gpmc_ecc1_result = gpmc_base + GPMC_ECC1_RESULT;
1118
1119 for (i = 0; i < GPMC_BCH_NUM_REMAINDER; i++) {
1120 reg->gpmc_bch_result0[i] = gpmc_base + GPMC_ECC_BCH_RESULT_0 +
1121 GPMC_BCH_SIZE * i;
1122 reg->gpmc_bch_result1[i] = gpmc_base + GPMC_ECC_BCH_RESULT_1 +
1123 GPMC_BCH_SIZE * i;
1124 reg->gpmc_bch_result2[i] = gpmc_base + GPMC_ECC_BCH_RESULT_2 +
1125 GPMC_BCH_SIZE * i;
1126 reg->gpmc_bch_result3[i] = gpmc_base + GPMC_ECC_BCH_RESULT_3 +
1127 GPMC_BCH_SIZE * i;
1128 reg->gpmc_bch_result4[i] = gpmc_base + GPMC_ECC_BCH_RESULT_4 +
1129 i * GPMC_BCH_SIZE;
1130 reg->gpmc_bch_result5[i] = gpmc_base + GPMC_ECC_BCH_RESULT_5 +
1131 i * GPMC_BCH_SIZE;
1132 reg->gpmc_bch_result6[i] = gpmc_base + GPMC_ECC_BCH_RESULT_6 +
1133 i * GPMC_BCH_SIZE;
1134 }
1135
1136 return &nand_ops;
1137 }
1138 EXPORT_SYMBOL_GPL(gpmc_omap_get_nand_ops);
1139
1140 static void gpmc_omap_onenand_calc_sync_timings(struct gpmc_timings *t,
1141 struct gpmc_settings *s,
1142 int freq, int latency)
1143 {
1144 struct gpmc_device_timings dev_t;
1145 const int t_cer = 15;
1146 const int t_avdp = 12;
1147 const int t_cez = 20; /* max of t_cez, t_oez */
1148 const int t_wpl = 40;
1149 const int t_wph = 30;
1150 int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo;
1151
1152 switch (freq) {
1153 case 104:
1154 min_gpmc_clk_period = 9600; /* 104 MHz */
1155 t_ces = 3;
1156 t_avds = 4;
1157 t_avdh = 2;
1158 t_ach = 3;
1159 t_aavdh = 6;
1160 t_rdyo = 6;
1161 break;
1162 case 83:
1163 min_gpmc_clk_period = 12000; /* 83 MHz */
1164 t_ces = 5;
1165 t_avds = 4;
1166 t_avdh = 2;
1167 t_ach = 6;
1168 t_aavdh = 6;
1169 t_rdyo = 9;
1170 break;
1171 case 66:
1172 min_gpmc_clk_period = 15000; /* 66 MHz */
1173 t_ces = 6;
1174 t_avds = 5;
1175 t_avdh = 2;
1176 t_ach = 6;
1177 t_aavdh = 6;
1178 t_rdyo = 11;
1179 break;
1180 default:
1181 min_gpmc_clk_period = 18500; /* 54 MHz */
1182 t_ces = 7;
1183 t_avds = 7;
1184 t_avdh = 7;
1185 t_ach = 9;
1186 t_aavdh = 7;
1187 t_rdyo = 15;
1188 break;
1189 }
1190
1191 /* Set synchronous read timings */
1192 memset(&dev_t, 0, sizeof(dev_t));
1193
1194 if (!s->sync_write) {
1195 dev_t.t_avdp_w = max(t_avdp, t_cer) * 1000;
1196 dev_t.t_wpl = t_wpl * 1000;
1197 dev_t.t_wph = t_wph * 1000;
1198 dev_t.t_aavdh = t_aavdh * 1000;
1199 }
1200 dev_t.ce_xdelay = true;
1201 dev_t.avd_xdelay = true;
1202 dev_t.oe_xdelay = true;
1203 dev_t.we_xdelay = true;
1204 dev_t.clk = min_gpmc_clk_period;
1205 dev_t.t_bacc = dev_t.clk;
1206 dev_t.t_ces = t_ces * 1000;
1207 dev_t.t_avds = t_avds * 1000;
1208 dev_t.t_avdh = t_avdh * 1000;
1209 dev_t.t_ach = t_ach * 1000;
1210 dev_t.cyc_iaa = (latency + 1);
1211 dev_t.t_cez_r = t_cez * 1000;
1212 dev_t.t_cez_w = dev_t.t_cez_r;
1213 dev_t.cyc_aavdh_oe = 1;
1214 dev_t.t_rdyo = t_rdyo * 1000 + min_gpmc_clk_period;
1215
1216 gpmc_calc_timings(t, s, &dev_t);
1217 }
1218
1219 int gpmc_omap_onenand_set_timings(struct device *dev, int cs, int freq,
1220 int latency,
1221 struct gpmc_onenand_info *info)
1222 {
1223 int ret;
1224 struct gpmc_timings gpmc_t;
1225 struct gpmc_settings gpmc_s;
1226
1227 gpmc_read_settings_dt(dev->of_node, &gpmc_s);
1228
1229 info->sync_read = gpmc_s.sync_read;
1230 info->sync_write = gpmc_s.sync_write;
1231 info->burst_len = gpmc_s.burst_len;
1232
1233 if (!gpmc_s.sync_read && !gpmc_s.sync_write)
1234 return 0;
1235
1236 gpmc_omap_onenand_calc_sync_timings(&gpmc_t, &gpmc_s, freq, latency);
1237
1238 ret = gpmc_cs_program_settings(cs, &gpmc_s);
1239 if (ret < 0)
1240 return ret;
1241
1242 return gpmc_cs_set_timings(cs, &gpmc_t, &gpmc_s);
1243 }
1244 EXPORT_SYMBOL_GPL(gpmc_omap_onenand_set_timings);
1245
1246 int gpmc_get_client_irq(unsigned irq_config)
1247 {
1248 if (!gpmc_irq_domain) {
1249 pr_warn("%s called before GPMC IRQ domain available\n",
1250 __func__);
1251 return 0;
1252 }
1253
1254 /* we restrict this to NAND IRQs only */
1255 if (irq_config >= GPMC_NR_NAND_IRQS)
1256 return 0;
1257
1258 return irq_create_mapping(gpmc_irq_domain, irq_config);
1259 }
1260
1261 static int gpmc_irq_endis(unsigned long hwirq, bool endis)
1262 {
1263 u32 regval;
1264
1265 /* bits GPMC_NR_NAND_IRQS to 8 are reserved */
1266 if (hwirq >= GPMC_NR_NAND_IRQS)
1267 hwirq += 8 - GPMC_NR_NAND_IRQS;
1268
1269 regval = gpmc_read_reg(GPMC_IRQENABLE);
1270 if (endis)
1271 regval |= BIT(hwirq);
1272 else
1273 regval &= ~BIT(hwirq);
1274 gpmc_write_reg(GPMC_IRQENABLE, regval);
1275
1276 return 0;
1277 }
1278
1279 static void gpmc_irq_disable(struct irq_data *p)
1280 {
1281 gpmc_irq_endis(p->hwirq, false);
1282 }
1283
1284 static void gpmc_irq_enable(struct irq_data *p)
1285 {
1286 gpmc_irq_endis(p->hwirq, true);
1287 }
1288
1289 static void gpmc_irq_mask(struct irq_data *d)
1290 {
1291 gpmc_irq_endis(d->hwirq, false);
1292 }
1293
1294 static void gpmc_irq_unmask(struct irq_data *d)
1295 {
1296 gpmc_irq_endis(d->hwirq, true);
1297 }
1298
1299 static void gpmc_irq_edge_config(unsigned long hwirq, bool rising_edge)
1300 {
1301 u32 regval;
1302
1303 /* NAND IRQs polarity is not configurable */
1304 if (hwirq < GPMC_NR_NAND_IRQS)
1305 return;
1306
1307 /* WAITPIN starts at BIT 8 */
1308 hwirq += 8 - GPMC_NR_NAND_IRQS;
1309
1310 regval = gpmc_read_reg(GPMC_CONFIG);
1311 if (rising_edge)
1312 regval &= ~BIT(hwirq);
1313 else
1314 regval |= BIT(hwirq);
1315
1316 gpmc_write_reg(GPMC_CONFIG, regval);
1317 }
1318
1319 static void gpmc_irq_ack(struct irq_data *d)
1320 {
1321 unsigned int hwirq = d->hwirq;
1322
1323 /* skip reserved bits */
1324 if (hwirq >= GPMC_NR_NAND_IRQS)
1325 hwirq += 8 - GPMC_NR_NAND_IRQS;
1326
1327 /* Setting bit to 1 clears (or Acks) the interrupt */
1328 gpmc_write_reg(GPMC_IRQSTATUS, BIT(hwirq));
1329 }
1330
1331 static int gpmc_irq_set_type(struct irq_data *d, unsigned int trigger)
1332 {
1333 /* can't set type for NAND IRQs */
1334 if (d->hwirq < GPMC_NR_NAND_IRQS)
1335 return -EINVAL;
1336
1337 /* We can support either rising or falling edge at a time */
1338 if (trigger == IRQ_TYPE_EDGE_FALLING)
1339 gpmc_irq_edge_config(d->hwirq, false);
1340 else if (trigger == IRQ_TYPE_EDGE_RISING)
1341 gpmc_irq_edge_config(d->hwirq, true);
1342 else
1343 return -EINVAL;
1344
1345 return 0;
1346 }
1347
1348 static int gpmc_irq_map(struct irq_domain *d, unsigned int virq,
1349 irq_hw_number_t hw)
1350 {
1351 struct gpmc_device *gpmc = d->host_data;
1352
1353 irq_set_chip_data(virq, gpmc);
1354 if (hw < GPMC_NR_NAND_IRQS) {
1355 irq_modify_status(virq, IRQ_NOREQUEST, IRQ_NOAUTOEN);
1356 irq_set_chip_and_handler(virq, &gpmc->irq_chip,
1357 handle_simple_irq);
1358 } else {
1359 irq_set_chip_and_handler(virq, &gpmc->irq_chip,
1360 handle_edge_irq);
1361 }
1362
1363 return 0;
1364 }
1365
1366 static const struct irq_domain_ops gpmc_irq_domain_ops = {
1367 .map = gpmc_irq_map,
1368 .xlate = irq_domain_xlate_twocell,
1369 };
1370
1371 static irqreturn_t gpmc_handle_irq(int irq, void *data)
1372 {
1373 int hwirq, virq;
1374 u32 regval, regvalx;
1375 struct gpmc_device *gpmc = data;
1376
1377 regval = gpmc_read_reg(GPMC_IRQSTATUS);
1378 regvalx = regval;
1379
1380 if (!regval)
1381 return IRQ_NONE;
1382
1383 for (hwirq = 0; hwirq < gpmc->nirqs; hwirq++) {
1384 /* skip reserved status bits */
1385 if (hwirq == GPMC_NR_NAND_IRQS)
1386 regvalx >>= 8 - GPMC_NR_NAND_IRQS;
1387
1388 if (regvalx & BIT(hwirq)) {
1389 virq = irq_find_mapping(gpmc_irq_domain, hwirq);
1390 if (!virq) {
1391 dev_warn(gpmc->dev,
1392 "spurious irq detected hwirq %d, virq %d\n",
1393 hwirq, virq);
1394 }
1395
1396 generic_handle_irq(virq);
1397 }
1398 }
1399
1400 gpmc_write_reg(GPMC_IRQSTATUS, regval);
1401
1402 return IRQ_HANDLED;
1403 }
1404
1405 static int gpmc_setup_irq(struct gpmc_device *gpmc)
1406 {
1407 u32 regval;
1408 int rc;
1409
1410 /* Disable interrupts */
1411 gpmc_write_reg(GPMC_IRQENABLE, 0);
1412
1413 /* clear interrupts */
1414 regval = gpmc_read_reg(GPMC_IRQSTATUS);
1415 gpmc_write_reg(GPMC_IRQSTATUS, regval);
1416
1417 gpmc->irq_chip.name = "gpmc";
1418 gpmc->irq_chip.irq_enable = gpmc_irq_enable;
1419 gpmc->irq_chip.irq_disable = gpmc_irq_disable;
1420 gpmc->irq_chip.irq_ack = gpmc_irq_ack;
1421 gpmc->irq_chip.irq_mask = gpmc_irq_mask;
1422 gpmc->irq_chip.irq_unmask = gpmc_irq_unmask;
1423 gpmc->irq_chip.irq_set_type = gpmc_irq_set_type;
1424
1425 gpmc_irq_domain = irq_domain_add_linear(gpmc->dev->of_node,
1426 gpmc->nirqs,
1427 &gpmc_irq_domain_ops,
1428 gpmc);
1429 if (!gpmc_irq_domain) {
1430 dev_err(gpmc->dev, "IRQ domain add failed\n");
1431 return -ENODEV;
1432 }
1433
1434 rc = request_irq(gpmc->irq, gpmc_handle_irq, 0, "gpmc", gpmc);
1435 if (rc) {
1436 dev_err(gpmc->dev, "failed to request irq %d: %d\n",
1437 gpmc->irq, rc);
1438 irq_domain_remove(gpmc_irq_domain);
1439 gpmc_irq_domain = NULL;
1440 }
1441
1442 return rc;
1443 }
1444
1445 static int gpmc_free_irq(struct gpmc_device *gpmc)
1446 {
1447 int hwirq;
1448
1449 free_irq(gpmc->irq, gpmc);
1450
1451 for (hwirq = 0; hwirq < gpmc->nirqs; hwirq++)
1452 irq_dispose_mapping(irq_find_mapping(gpmc_irq_domain, hwirq));
1453
1454 irq_domain_remove(gpmc_irq_domain);
1455 gpmc_irq_domain = NULL;
1456
1457 return 0;
1458 }
1459
1460 static void gpmc_mem_exit(void)
1461 {
1462 int cs;
1463
1464 for (cs = 0; cs < gpmc_cs_num; cs++) {
1465 if (!gpmc_cs_mem_enabled(cs))
1466 continue;
1467 gpmc_cs_delete_mem(cs);
1468 }
1469
1470 }
1471
1472 static void gpmc_mem_init(void)
1473 {
1474 int cs;
1475
1476 gpmc_mem_root.start = GPMC_MEM_START;
1477 gpmc_mem_root.end = GPMC_MEM_END;
1478
1479 /* Reserve all regions that has been set up by bootloader */
1480 for (cs = 0; cs < gpmc_cs_num; cs++) {
1481 u32 base, size;
1482
1483 if (!gpmc_cs_mem_enabled(cs))
1484 continue;
1485 gpmc_cs_get_memconf(cs, &base, &size);
1486 if (gpmc_cs_insert_mem(cs, base, size)) {
1487 pr_warn("%s: disabling cs %d mapped at 0x%x-0x%x\n",
1488 __func__, cs, base, base + size);
1489 gpmc_cs_disable_mem(cs);
1490 }
1491 }
1492 }
1493
1494 static u32 gpmc_round_ps_to_sync_clk(u32 time_ps, u32 sync_clk)
1495 {
1496 u32 temp;
1497 int div;
1498
1499 div = gpmc_calc_divider(sync_clk);
1500 temp = gpmc_ps_to_ticks(time_ps);
1501 temp = (temp + div - 1) / div;
1502 return gpmc_ticks_to_ps(temp * div);
1503 }
1504
1505 /* XXX: can the cycles be avoided ? */
1506 static int gpmc_calc_sync_read_timings(struct gpmc_timings *gpmc_t,
1507 struct gpmc_device_timings *dev_t,
1508 bool mux)
1509 {
1510 u32 temp;
1511
1512 /* adv_rd_off */
1513 temp = dev_t->t_avdp_r;
1514 /* XXX: mux check required ? */
1515 if (mux) {
1516 /* XXX: t_avdp not to be required for sync, only added for tusb
1517 * this indirectly necessitates requirement of t_avdp_r and
1518 * t_avdp_w instead of having a single t_avdp
1519 */
1520 temp = max_t(u32, temp, gpmc_t->clk_activation + dev_t->t_avdh);
1521 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
1522 }
1523 gpmc_t->adv_rd_off = gpmc_round_ps_to_ticks(temp);
1524
1525 /* oe_on */
1526 temp = dev_t->t_oeasu; /* XXX: remove this ? */
1527 if (mux) {
1528 temp = max_t(u32, temp, gpmc_t->clk_activation + dev_t->t_ach);
1529 temp = max_t(u32, temp, gpmc_t->adv_rd_off +
1530 gpmc_ticks_to_ps(dev_t->cyc_aavdh_oe));
1531 }
1532 gpmc_t->oe_on = gpmc_round_ps_to_ticks(temp);
1533
1534 /* access */
1535 /* XXX: any scope for improvement ?, by combining oe_on
1536 * and clk_activation, need to check whether
1537 * access = clk_activation + round to sync clk ?
1538 */
1539 temp = max_t(u32, dev_t->t_iaa, dev_t->cyc_iaa * gpmc_t->sync_clk);
1540 temp += gpmc_t->clk_activation;
1541 if (dev_t->cyc_oe)
1542 temp = max_t(u32, temp, gpmc_t->oe_on +
1543 gpmc_ticks_to_ps(dev_t->cyc_oe));
1544 gpmc_t->access = gpmc_round_ps_to_ticks(temp);
1545
1546 gpmc_t->oe_off = gpmc_t->access + gpmc_ticks_to_ps(1);
1547 gpmc_t->cs_rd_off = gpmc_t->oe_off;
1548
1549 /* rd_cycle */
1550 temp = max_t(u32, dev_t->t_cez_r, dev_t->t_oez);
1551 temp = gpmc_round_ps_to_sync_clk(temp, gpmc_t->sync_clk) +
1552 gpmc_t->access;
1553 /* XXX: barter t_ce_rdyz with t_cez_r ? */
1554 if (dev_t->t_ce_rdyz)
1555 temp = max_t(u32, temp, gpmc_t->cs_rd_off + dev_t->t_ce_rdyz);
1556 gpmc_t->rd_cycle = gpmc_round_ps_to_ticks(temp);
1557
1558 return 0;
1559 }
1560
1561 static int gpmc_calc_sync_write_timings(struct gpmc_timings *gpmc_t,
1562 struct gpmc_device_timings *dev_t,
1563 bool mux)
1564 {
1565 u32 temp;
1566
1567 /* adv_wr_off */
1568 temp = dev_t->t_avdp_w;
1569 if (mux) {
1570 temp = max_t(u32, temp,
1571 gpmc_t->clk_activation + dev_t->t_avdh);
1572 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
1573 }
1574 gpmc_t->adv_wr_off = gpmc_round_ps_to_ticks(temp);
1575
1576 /* wr_data_mux_bus */
1577 temp = max_t(u32, dev_t->t_weasu,
1578 gpmc_t->clk_activation + dev_t->t_rdyo);
1579 /* XXX: shouldn't mux be kept as a whole for wr_data_mux_bus ?,
1580 * and in that case remember to handle we_on properly
1581 */
1582 if (mux) {
1583 temp = max_t(u32, temp,
1584 gpmc_t->adv_wr_off + dev_t->t_aavdh);
1585 temp = max_t(u32, temp, gpmc_t->adv_wr_off +
1586 gpmc_ticks_to_ps(dev_t->cyc_aavdh_we));
1587 }
1588 gpmc_t->wr_data_mux_bus = gpmc_round_ps_to_ticks(temp);
1589
1590 /* we_on */
1591 if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
1592 gpmc_t->we_on = gpmc_round_ps_to_ticks(dev_t->t_weasu);
1593 else
1594 gpmc_t->we_on = gpmc_t->wr_data_mux_bus;
1595
1596 /* wr_access */
1597 /* XXX: gpmc_capability check reqd ? , even if not, will not harm */
1598 gpmc_t->wr_access = gpmc_t->access;
1599
1600 /* we_off */
1601 temp = gpmc_t->we_on + dev_t->t_wpl;
1602 temp = max_t(u32, temp,
1603 gpmc_t->wr_access + gpmc_ticks_to_ps(1));
1604 temp = max_t(u32, temp,
1605 gpmc_t->we_on + gpmc_ticks_to_ps(dev_t->cyc_wpl));
1606 gpmc_t->we_off = gpmc_round_ps_to_ticks(temp);
1607
1608 gpmc_t->cs_wr_off = gpmc_round_ps_to_ticks(gpmc_t->we_off +
1609 dev_t->t_wph);
1610
1611 /* wr_cycle */
1612 temp = gpmc_round_ps_to_sync_clk(dev_t->t_cez_w, gpmc_t->sync_clk);
1613 temp += gpmc_t->wr_access;
1614 /* XXX: barter t_ce_rdyz with t_cez_w ? */
1615 if (dev_t->t_ce_rdyz)
1616 temp = max_t(u32, temp,
1617 gpmc_t->cs_wr_off + dev_t->t_ce_rdyz);
1618 gpmc_t->wr_cycle = gpmc_round_ps_to_ticks(temp);
1619
1620 return 0;
1621 }
1622
1623 static int gpmc_calc_async_read_timings(struct gpmc_timings *gpmc_t,
1624 struct gpmc_device_timings *dev_t,
1625 bool mux)
1626 {
1627 u32 temp;
1628
1629 /* adv_rd_off */
1630 temp = dev_t->t_avdp_r;
1631 if (mux)
1632 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
1633 gpmc_t->adv_rd_off = gpmc_round_ps_to_ticks(temp);
1634
1635 /* oe_on */
1636 temp = dev_t->t_oeasu;
1637 if (mux)
1638 temp = max_t(u32, temp,
1639 gpmc_t->adv_rd_off + dev_t->t_aavdh);
1640 gpmc_t->oe_on = gpmc_round_ps_to_ticks(temp);
1641
1642 /* access */
1643 temp = max_t(u32, dev_t->t_iaa, /* XXX: remove t_iaa in async ? */
1644 gpmc_t->oe_on + dev_t->t_oe);
1645 temp = max_t(u32, temp,
1646 gpmc_t->cs_on + dev_t->t_ce);
1647 temp = max_t(u32, temp,
1648 gpmc_t->adv_on + dev_t->t_aa);
1649 gpmc_t->access = gpmc_round_ps_to_ticks(temp);
1650
1651 gpmc_t->oe_off = gpmc_t->access + gpmc_ticks_to_ps(1);
1652 gpmc_t->cs_rd_off = gpmc_t->oe_off;
1653
1654 /* rd_cycle */
1655 temp = max_t(u32, dev_t->t_rd_cycle,
1656 gpmc_t->cs_rd_off + dev_t->t_cez_r);
1657 temp = max_t(u32, temp, gpmc_t->oe_off + dev_t->t_oez);
1658 gpmc_t->rd_cycle = gpmc_round_ps_to_ticks(temp);
1659
1660 return 0;
1661 }
1662
1663 static int gpmc_calc_async_write_timings(struct gpmc_timings *gpmc_t,
1664 struct gpmc_device_timings *dev_t,
1665 bool mux)
1666 {
1667 u32 temp;
1668
1669 /* adv_wr_off */
1670 temp = dev_t->t_avdp_w;
1671 if (mux)
1672 temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
1673 gpmc_t->adv_wr_off = gpmc_round_ps_to_ticks(temp);
1674
1675 /* wr_data_mux_bus */
1676 temp = dev_t->t_weasu;
1677 if (mux) {
1678 temp = max_t(u32, temp, gpmc_t->adv_wr_off + dev_t->t_aavdh);
1679 temp = max_t(u32, temp, gpmc_t->adv_wr_off +
1680 gpmc_ticks_to_ps(dev_t->cyc_aavdh_we));
1681 }
1682 gpmc_t->wr_data_mux_bus = gpmc_round_ps_to_ticks(temp);
1683
1684 /* we_on */
1685 if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
1686 gpmc_t->we_on = gpmc_round_ps_to_ticks(dev_t->t_weasu);
1687 else
1688 gpmc_t->we_on = gpmc_t->wr_data_mux_bus;
1689
1690 /* we_off */
1691 temp = gpmc_t->we_on + dev_t->t_wpl;
1692 gpmc_t->we_off = gpmc_round_ps_to_ticks(temp);
1693
1694 gpmc_t->cs_wr_off = gpmc_round_ps_to_ticks(gpmc_t->we_off +
1695 dev_t->t_wph);
1696
1697 /* wr_cycle */
1698 temp = max_t(u32, dev_t->t_wr_cycle,
1699 gpmc_t->cs_wr_off + dev_t->t_cez_w);
1700 gpmc_t->wr_cycle = gpmc_round_ps_to_ticks(temp);
1701
1702 return 0;
1703 }
1704
1705 static int gpmc_calc_sync_common_timings(struct gpmc_timings *gpmc_t,
1706 struct gpmc_device_timings *dev_t)
1707 {
1708 u32 temp;
1709
1710 gpmc_t->sync_clk = gpmc_calc_divider(dev_t->clk) *
1711 gpmc_get_fclk_period();
1712
1713 gpmc_t->page_burst_access = gpmc_round_ps_to_sync_clk(
1714 dev_t->t_bacc,
1715 gpmc_t->sync_clk);
1716
1717 temp = max_t(u32, dev_t->t_ces, dev_t->t_avds);
1718 gpmc_t->clk_activation = gpmc_round_ps_to_ticks(temp);
1719
1720 if (gpmc_calc_divider(gpmc_t->sync_clk) != 1)
1721 return 0;
1722
1723 if (dev_t->ce_xdelay)
1724 gpmc_t->bool_timings.cs_extra_delay = true;
1725 if (dev_t->avd_xdelay)
1726 gpmc_t->bool_timings.adv_extra_delay = true;
1727 if (dev_t->oe_xdelay)
1728 gpmc_t->bool_timings.oe_extra_delay = true;
1729 if (dev_t->we_xdelay)
1730 gpmc_t->bool_timings.we_extra_delay = true;
1731
1732 return 0;
1733 }
1734
1735 static int gpmc_calc_common_timings(struct gpmc_timings *gpmc_t,
1736 struct gpmc_device_timings *dev_t,
1737 bool sync)
1738 {
1739 u32 temp;
1740
1741 /* cs_on */
1742 gpmc_t->cs_on = gpmc_round_ps_to_ticks(dev_t->t_ceasu);
1743
1744 /* adv_on */
1745 temp = dev_t->t_avdasu;
1746 if (dev_t->t_ce_avd)
1747 temp = max_t(u32, temp,
1748 gpmc_t->cs_on + dev_t->t_ce_avd);
1749 gpmc_t->adv_on = gpmc_round_ps_to_ticks(temp);
1750
1751 if (sync)
1752 gpmc_calc_sync_common_timings(gpmc_t, dev_t);
1753
1754 return 0;
1755 }
1756
1757 /* TODO: remove this function once all peripherals are confirmed to
1758 * work with generic timing. Simultaneously gpmc_cs_set_timings()
1759 * has to be modified to handle timings in ps instead of ns
1760 */
1761 static void gpmc_convert_ps_to_ns(struct gpmc_timings *t)
1762 {
1763 t->cs_on /= 1000;
1764 t->cs_rd_off /= 1000;
1765 t->cs_wr_off /= 1000;
1766 t->adv_on /= 1000;
1767 t->adv_rd_off /= 1000;
1768 t->adv_wr_off /= 1000;
1769 t->we_on /= 1000;
1770 t->we_off /= 1000;
1771 t->oe_on /= 1000;
1772 t->oe_off /= 1000;
1773 t->page_burst_access /= 1000;
1774 t->access /= 1000;
1775 t->rd_cycle /= 1000;
1776 t->wr_cycle /= 1000;
1777 t->bus_turnaround /= 1000;
1778 t->cycle2cycle_delay /= 1000;
1779 t->wait_monitoring /= 1000;
1780 t->clk_activation /= 1000;
1781 t->wr_access /= 1000;
1782 t->wr_data_mux_bus /= 1000;
1783 }
1784
1785 int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
1786 struct gpmc_settings *gpmc_s,
1787 struct gpmc_device_timings *dev_t)
1788 {
1789 bool mux = false, sync = false;
1790
1791 if (gpmc_s) {
1792 mux = gpmc_s->mux_add_data ? true : false;
1793 sync = (gpmc_s->sync_read || gpmc_s->sync_write);
1794 }
1795
1796 memset(gpmc_t, 0, sizeof(*gpmc_t));
1797
1798 gpmc_calc_common_timings(gpmc_t, dev_t, sync);
1799
1800 if (gpmc_s && gpmc_s->sync_read)
1801 gpmc_calc_sync_read_timings(gpmc_t, dev_t, mux);
1802 else
1803 gpmc_calc_async_read_timings(gpmc_t, dev_t, mux);
1804
1805 if (gpmc_s && gpmc_s->sync_write)
1806 gpmc_calc_sync_write_timings(gpmc_t, dev_t, mux);
1807 else
1808 gpmc_calc_async_write_timings(gpmc_t, dev_t, mux);
1809
1810 /* TODO: remove, see function definition */
1811 gpmc_convert_ps_to_ns(gpmc_t);
1812
1813 return 0;
1814 }
1815
1816 /**
1817 * gpmc_cs_program_settings - programs non-timing related settings
1818 * @cs: GPMC chip-select to program
1819 * @p: pointer to GPMC settings structure
1820 *
1821 * Programs non-timing related settings for a GPMC chip-select, such as
1822 * bus-width, burst configuration, etc. Function should be called once
1823 * for each chip-select that is being used and must be called before
1824 * calling gpmc_cs_set_timings() as timing parameters in the CONFIG1
1825 * register will be initialised to zero by this function. Returns 0 on
1826 * success and appropriate negative error code on failure.
1827 */
1828 int gpmc_cs_program_settings(int cs, struct gpmc_settings *p)
1829 {
1830 u32 config1;
1831
1832 if ((!p->device_width) || (p->device_width > GPMC_DEVWIDTH_16BIT)) {
1833 pr_err("%s: invalid width %d!", __func__, p->device_width);
1834 return -EINVAL;
1835 }
1836
1837 /* Address-data multiplexing not supported for NAND devices */
1838 if (p->device_nand && p->mux_add_data) {
1839 pr_err("%s: invalid configuration!\n", __func__);
1840 return -EINVAL;
1841 }
1842
1843 if ((p->mux_add_data > GPMC_MUX_AD) ||
1844 ((p->mux_add_data == GPMC_MUX_AAD) &&
1845 !(gpmc_capability & GPMC_HAS_MUX_AAD))) {
1846 pr_err("%s: invalid multiplex configuration!\n", __func__);
1847 return -EINVAL;
1848 }
1849
1850 /* Page/burst mode supports lengths of 4, 8 and 16 bytes */
1851 if (p->burst_read || p->burst_write) {
1852 switch (p->burst_len) {
1853 case GPMC_BURST_4:
1854 case GPMC_BURST_8:
1855 case GPMC_BURST_16:
1856 break;
1857 default:
1858 pr_err("%s: invalid page/burst-length (%d)\n",
1859 __func__, p->burst_len);
1860 return -EINVAL;
1861 }
1862 }
1863
1864 if (p->wait_pin > gpmc_nr_waitpins) {
1865 pr_err("%s: invalid wait-pin (%d)\n", __func__, p->wait_pin);
1866 return -EINVAL;
1867 }
1868
1869 config1 = GPMC_CONFIG1_DEVICESIZE((p->device_width - 1));
1870
1871 if (p->sync_read)
1872 config1 |= GPMC_CONFIG1_READTYPE_SYNC;
1873 if (p->sync_write)
1874 config1 |= GPMC_CONFIG1_WRITETYPE_SYNC;
1875 if (p->wait_on_read)
1876 config1 |= GPMC_CONFIG1_WAIT_READ_MON;
1877 if (p->wait_on_write)
1878 config1 |= GPMC_CONFIG1_WAIT_WRITE_MON;
1879 if (p->wait_on_read || p->wait_on_write)
1880 config1 |= GPMC_CONFIG1_WAIT_PIN_SEL(p->wait_pin);
1881 if (p->device_nand)
1882 config1 |= GPMC_CONFIG1_DEVICETYPE(GPMC_DEVICETYPE_NAND);
1883 if (p->mux_add_data)
1884 config1 |= GPMC_CONFIG1_MUXTYPE(p->mux_add_data);
1885 if (p->burst_read)
1886 config1 |= GPMC_CONFIG1_READMULTIPLE_SUPP;
1887 if (p->burst_write)
1888 config1 |= GPMC_CONFIG1_WRITEMULTIPLE_SUPP;
1889 if (p->burst_read || p->burst_write) {
1890 config1 |= GPMC_CONFIG1_PAGE_LEN(p->burst_len >> 3);
1891 config1 |= p->burst_wrap ? GPMC_CONFIG1_WRAPBURST_SUPP : 0;
1892 }
1893
1894 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, config1);
1895
1896 return 0;
1897 }
1898
1899 #ifdef CONFIG_OF
1900 static const struct of_device_id gpmc_dt_ids[] = {
1901 { .compatible = "ti,omap2420-gpmc" },
1902 { .compatible = "ti,omap2430-gpmc" },
1903 { .compatible = "ti,omap3430-gpmc" }, /* omap3430 & omap3630 */
1904 { .compatible = "ti,omap4430-gpmc" }, /* omap4430 & omap4460 & omap543x */
1905 { .compatible = "ti,am3352-gpmc" }, /* am335x devices */
1906 { }
1907 };
1908
1909 /**
1910 * gpmc_read_settings_dt - read gpmc settings from device-tree
1911 * @np: pointer to device-tree node for a gpmc child device
1912 * @p: pointer to gpmc settings structure
1913 *
1914 * Reads the GPMC settings for a GPMC child device from device-tree and
1915 * stores them in the GPMC settings structure passed. The GPMC settings
1916 * structure is initialised to zero by this function and so any
1917 * previously stored settings will be cleared.
1918 */
1919 void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
1920 {
1921 memset(p, 0, sizeof(struct gpmc_settings));
1922
1923 p->sync_read = of_property_read_bool(np, "gpmc,sync-read");
1924 p->sync_write = of_property_read_bool(np, "gpmc,sync-write");
1925 of_property_read_u32(np, "gpmc,device-width", &p->device_width);
1926 of_property_read_u32(np, "gpmc,mux-add-data", &p->mux_add_data);
1927
1928 if (!of_property_read_u32(np, "gpmc,burst-length", &p->burst_len)) {
1929 p->burst_wrap = of_property_read_bool(np, "gpmc,burst-wrap");
1930 p->burst_read = of_property_read_bool(np, "gpmc,burst-read");
1931 p->burst_write = of_property_read_bool(np, "gpmc,burst-write");
1932 if (!p->burst_read && !p->burst_write)
1933 pr_warn("%s: page/burst-length set but not used!\n",
1934 __func__);
1935 }
1936
1937 if (!of_property_read_u32(np, "gpmc,wait-pin", &p->wait_pin)) {
1938 p->wait_on_read = of_property_read_bool(np,
1939 "gpmc,wait-on-read");
1940 p->wait_on_write = of_property_read_bool(np,
1941 "gpmc,wait-on-write");
1942 if (!p->wait_on_read && !p->wait_on_write)
1943 pr_debug("%s: rd/wr wait monitoring not enabled!\n",
1944 __func__);
1945 }
1946 }
1947
1948 static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
1949 struct gpmc_timings *gpmc_t)
1950 {
1951 struct gpmc_bool_timings *p;
1952
1953 if (!np || !gpmc_t)
1954 return;
1955
1956 memset(gpmc_t, 0, sizeof(*gpmc_t));
1957
1958 /* minimum clock period for syncronous mode */
1959 of_property_read_u32(np, "gpmc,sync-clk-ps", &gpmc_t->sync_clk);
1960
1961 /* chip select timtings */
1962 of_property_read_u32(np, "gpmc,cs-on-ns", &gpmc_t->cs_on);
1963 of_property_read_u32(np, "gpmc,cs-rd-off-ns", &gpmc_t->cs_rd_off);
1964 of_property_read_u32(np, "gpmc,cs-wr-off-ns", &gpmc_t->cs_wr_off);
1965
1966 /* ADV signal timings */
1967 of_property_read_u32(np, "gpmc,adv-on-ns", &gpmc_t->adv_on);
1968 of_property_read_u32(np, "gpmc,adv-rd-off-ns", &gpmc_t->adv_rd_off);
1969 of_property_read_u32(np, "gpmc,adv-wr-off-ns", &gpmc_t->adv_wr_off);
1970 of_property_read_u32(np, "gpmc,adv-aad-mux-on-ns",
1971 &gpmc_t->adv_aad_mux_on);
1972 of_property_read_u32(np, "gpmc,adv-aad-mux-rd-off-ns",
1973 &gpmc_t->adv_aad_mux_rd_off);
1974 of_property_read_u32(np, "gpmc,adv-aad-mux-wr-off-ns",
1975 &gpmc_t->adv_aad_mux_wr_off);
1976
1977 /* WE signal timings */
1978 of_property_read_u32(np, "gpmc,we-on-ns", &gpmc_t->we_on);
1979 of_property_read_u32(np, "gpmc,we-off-ns", &gpmc_t->we_off);
1980
1981 /* OE signal timings */
1982 of_property_read_u32(np, "gpmc,oe-on-ns", &gpmc_t->oe_on);
1983 of_property_read_u32(np, "gpmc,oe-off-ns", &gpmc_t->oe_off);
1984 of_property_read_u32(np, "gpmc,oe-aad-mux-on-ns",
1985 &gpmc_t->oe_aad_mux_on);
1986 of_property_read_u32(np, "gpmc,oe-aad-mux-off-ns",
1987 &gpmc_t->oe_aad_mux_off);
1988
1989 /* access and cycle timings */
1990 of_property_read_u32(np, "gpmc,page-burst-access-ns",
1991 &gpmc_t->page_burst_access);
1992 of_property_read_u32(np, "gpmc,access-ns", &gpmc_t->access);
1993 of_property_read_u32(np, "gpmc,rd-cycle-ns", &gpmc_t->rd_cycle);
1994 of_property_read_u32(np, "gpmc,wr-cycle-ns", &gpmc_t->wr_cycle);
1995 of_property_read_u32(np, "gpmc,bus-turnaround-ns",
1996 &gpmc_t->bus_turnaround);
1997 of_property_read_u32(np, "gpmc,cycle2cycle-delay-ns",
1998 &gpmc_t->cycle2cycle_delay);
1999 of_property_read_u32(np, "gpmc,wait-monitoring-ns",
2000 &gpmc_t->wait_monitoring);
2001 of_property_read_u32(np, "gpmc,clk-activation-ns",
2002 &gpmc_t->clk_activation);
2003
2004 /* only applicable to OMAP3+ */
2005 of_property_read_u32(np, "gpmc,wr-access-ns", &gpmc_t->wr_access);
2006 of_property_read_u32(np, "gpmc,wr-data-mux-bus-ns",
2007 &gpmc_t->wr_data_mux_bus);
2008
2009 /* bool timing parameters */
2010 p = &gpmc_t->bool_timings;
2011
2012 p->cycle2cyclediffcsen =
2013 of_property_read_bool(np, "gpmc,cycle2cycle-diffcsen");
2014 p->cycle2cyclesamecsen =
2015 of_property_read_bool(np, "gpmc,cycle2cycle-samecsen");
2016 p->we_extra_delay = of_property_read_bool(np, "gpmc,we-extra-delay");
2017 p->oe_extra_delay = of_property_read_bool(np, "gpmc,oe-extra-delay");
2018 p->adv_extra_delay = of_property_read_bool(np, "gpmc,adv-extra-delay");
2019 p->cs_extra_delay = of_property_read_bool(np, "gpmc,cs-extra-delay");
2020 p->time_para_granularity =
2021 of_property_read_bool(np, "gpmc,time-para-granularity");
2022 }
2023
2024 /**
2025 * gpmc_probe_generic_child - configures the gpmc for a child device
2026 * @pdev: pointer to gpmc platform device
2027 * @child: pointer to device-tree node for child device
2028 *
2029 * Allocates and configures a GPMC chip-select for a child device.
2030 * Returns 0 on success and appropriate negative error code on failure.
2031 */
2032 static int gpmc_probe_generic_child(struct platform_device *pdev,
2033 struct device_node *child)
2034 {
2035 struct gpmc_settings gpmc_s;
2036 struct gpmc_timings gpmc_t;
2037 struct resource res;
2038 unsigned long base;
2039 const char *name;
2040 int ret, cs;
2041 u32 val;
2042 struct gpio_desc *waitpin_desc = NULL;
2043 struct gpmc_device *gpmc = platform_get_drvdata(pdev);
2044
2045 if (of_property_read_u32(child, "reg", &cs) < 0) {
2046 dev_err(&pdev->dev, "%pOF has no 'reg' property\n",
2047 child);
2048 return -ENODEV;
2049 }
2050
2051 if (of_address_to_resource(child, 0, &res) < 0) {
2052 dev_err(&pdev->dev, "%pOF has malformed 'reg' property\n",
2053 child);
2054 return -ENODEV;
2055 }
2056
2057 /*
2058 * Check if we have multiple instances of the same device
2059 * on a single chip select. If so, use the already initialized
2060 * timings.
2061 */
2062 name = gpmc_cs_get_name(cs);
2063 if (name && of_node_cmp(child->name, name) == 0)
2064 goto no_timings;
2065
2066 ret = gpmc_cs_request(cs, resource_size(&res), &base);
2067 if (ret < 0) {
2068 dev_err(&pdev->dev, "cannot request GPMC CS %d\n", cs);
2069 return ret;
2070 }
2071 gpmc_cs_set_name(cs, child->name);
2072
2073 gpmc_read_settings_dt(child, &gpmc_s);
2074 gpmc_read_timings_dt(child, &gpmc_t);
2075
2076 /*
2077 * For some GPMC devices we still need to rely on the bootloader
2078 * timings because the devices can be connected via FPGA.
2079 * REVISIT: Add timing support from slls644g.pdf.
2080 */
2081 if (!gpmc_t.cs_rd_off) {
2082 WARN(1, "enable GPMC debug to configure .dts timings for CS%i\n",
2083 cs);
2084 gpmc_cs_show_timings(cs,
2085 "please add GPMC bootloader timings to .dts");
2086 goto no_timings;
2087 }
2088
2089 /* CS must be disabled while making changes to gpmc configuration */
2090 gpmc_cs_disable_mem(cs);
2091
2092 /*
2093 * FIXME: gpmc_cs_request() will map the CS to an arbitary
2094 * location in the gpmc address space. When booting with
2095 * device-tree we want the NOR flash to be mapped to the
2096 * location specified in the device-tree blob. So remap the
2097 * CS to this location. Once DT migration is complete should
2098 * just make gpmc_cs_request() map a specific address.
2099 */
2100 ret = gpmc_cs_remap(cs, res.start);
2101 if (ret < 0) {
2102 dev_err(&pdev->dev, "cannot remap GPMC CS %d to %pa\n",
2103 cs, &res.start);
2104 if (res.start < GPMC_MEM_START) {
2105 dev_info(&pdev->dev,
2106 "GPMC CS %d start cannot be lesser than 0x%x\n",
2107 cs, GPMC_MEM_START);
2108 } else if (res.end > GPMC_MEM_END) {
2109 dev_info(&pdev->dev,
2110 "GPMC CS %d end cannot be greater than 0x%x\n",
2111 cs, GPMC_MEM_END);
2112 }
2113 goto err;
2114 }
2115
2116 if (of_node_cmp(child->name, "nand") == 0) {
2117 /* Warn about older DT blobs with no compatible property */
2118 if (!of_property_read_bool(child, "compatible")) {
2119 dev_warn(&pdev->dev,
2120 "Incompatible NAND node: missing compatible");
2121 ret = -EINVAL;
2122 goto err;
2123 }
2124 }
2125
2126 if (of_node_cmp(child->name, "onenand") == 0) {
2127 /* Warn about older DT blobs with no compatible property */
2128 if (!of_property_read_bool(child, "compatible")) {
2129 dev_warn(&pdev->dev,
2130 "Incompatible OneNAND node: missing compatible");
2131 ret = -EINVAL;
2132 goto err;
2133 }
2134 }
2135
2136 if (of_device_is_compatible(child, "ti,omap2-nand")) {
2137 /* NAND specific setup */
2138 val = 8;
2139 of_property_read_u32(child, "nand-bus-width", &val);
2140 switch (val) {
2141 case 8:
2142 gpmc_s.device_width = GPMC_DEVWIDTH_8BIT;
2143 break;
2144 case 16:
2145 gpmc_s.device_width = GPMC_DEVWIDTH_16BIT;
2146 break;
2147 default:
2148 dev_err(&pdev->dev, "%s: invalid 'nand-bus-width'\n",
2149 child->name);
2150 ret = -EINVAL;
2151 goto err;
2152 }
2153
2154 /* disable write protect */
2155 gpmc_configure(GPMC_CONFIG_WP, 0);
2156 gpmc_s.device_nand = true;
2157 } else {
2158 ret = of_property_read_u32(child, "bank-width",
2159 &gpmc_s.device_width);
2160 if (ret < 0 && !gpmc_s.device_width) {
2161 dev_err(&pdev->dev,
2162 "%pOF has no 'gpmc,device-width' property\n",
2163 child);
2164 goto err;
2165 }
2166 }
2167
2168 /* Reserve wait pin if it is required and valid */
2169 if (gpmc_s.wait_on_read || gpmc_s.wait_on_write) {
2170 unsigned int wait_pin = gpmc_s.wait_pin;
2171
2172 waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
2173 wait_pin, "WAITPIN");
2174 if (IS_ERR(waitpin_desc)) {
2175 dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin);
2176 ret = PTR_ERR(waitpin_desc);
2177 goto err;
2178 }
2179 }
2180
2181 gpmc_cs_show_timings(cs, "before gpmc_cs_program_settings");
2182
2183 ret = gpmc_cs_program_settings(cs, &gpmc_s);
2184 if (ret < 0)
2185 goto err_cs;
2186
2187 ret = gpmc_cs_set_timings(cs, &gpmc_t, &gpmc_s);
2188 if (ret) {
2189 dev_err(&pdev->dev, "failed to set gpmc timings for: %s\n",
2190 child->name);
2191 goto err_cs;
2192 }
2193
2194 /* Clear limited address i.e. enable A26-A11 */
2195 val = gpmc_read_reg(GPMC_CONFIG);
2196 val &= ~GPMC_CONFIG_LIMITEDADDRESS;
2197 gpmc_write_reg(GPMC_CONFIG, val);
2198
2199 /* Enable CS region */
2200 gpmc_cs_enable_mem(cs);
2201
2202 no_timings:
2203
2204 /* create platform device, NULL on error or when disabled */
2205 if (!of_platform_device_create(child, NULL, &pdev->dev))
2206 goto err_child_fail;
2207
2208 /* is child a common bus? */
2209 if (of_match_node(of_default_bus_match_table, child))
2210 /* create children and other common bus children */
2211 if (of_platform_default_populate(child, NULL, &pdev->dev))
2212 goto err_child_fail;
2213
2214 return 0;
2215
2216 err_child_fail:
2217
2218 dev_err(&pdev->dev, "failed to create gpmc child %s\n", child->name);
2219 ret = -ENODEV;
2220
2221 err_cs:
2222 gpiochip_free_own_desc(waitpin_desc);
2223 err:
2224 gpmc_cs_free(cs);
2225
2226 return ret;
2227 }
2228
2229 static int gpmc_probe_dt(struct platform_device *pdev)
2230 {
2231 int ret;
2232 const struct of_device_id *of_id =
2233 of_match_device(gpmc_dt_ids, &pdev->dev);
2234
2235 if (!of_id)
2236 return 0;
2237
2238 ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-cs",
2239 &gpmc_cs_num);
2240 if (ret < 0) {
2241 pr_err("%s: number of chip-selects not defined\n", __func__);
2242 return ret;
2243 } else if (gpmc_cs_num < 1) {
2244 pr_err("%s: all chip-selects are disabled\n", __func__);
2245 return -EINVAL;
2246 } else if (gpmc_cs_num > GPMC_CS_NUM) {
2247 pr_err("%s: number of supported chip-selects cannot be > %d\n",
2248 __func__, GPMC_CS_NUM);
2249 return -EINVAL;
2250 }
2251
2252 ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-waitpins",
2253 &gpmc_nr_waitpins);
2254 if (ret < 0) {
2255 pr_err("%s: number of wait pins not found!\n", __func__);
2256 return ret;
2257 }
2258
2259 return 0;
2260 }
2261
2262 static void gpmc_probe_dt_children(struct platform_device *pdev)
2263 {
2264 int ret;
2265 struct device_node *child;
2266
2267 for_each_available_child_of_node(pdev->dev.of_node, child) {
2268
2269 if (!child->name)
2270 continue;
2271
2272 ret = gpmc_probe_generic_child(pdev, child);
2273 if (ret) {
2274 dev_err(&pdev->dev, "failed to probe DT child '%s': %d\n",
2275 child->name, ret);
2276 }
2277 }
2278 }
2279 #else
2280 static int gpmc_probe_dt(struct platform_device *pdev)
2281 {
2282 return 0;
2283 }
2284
2285 static void gpmc_probe_dt_children(struct platform_device *pdev)
2286 {
2287 }
2288 #endif /* CONFIG_OF */
2289
2290 static int gpmc_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
2291 {
2292 return 1; /* we're input only */
2293 }
2294
2295 static int gpmc_gpio_direction_input(struct gpio_chip *chip,
2296 unsigned int offset)
2297 {
2298 return 0; /* we're input only */
2299 }
2300
2301 static int gpmc_gpio_direction_output(struct gpio_chip *chip,
2302 unsigned int offset, int value)
2303 {
2304 return -EINVAL; /* we're input only */
2305 }
2306
2307 static void gpmc_gpio_set(struct gpio_chip *chip, unsigned int offset,
2308 int value)
2309 {
2310 }
2311
2312 static int gpmc_gpio_get(struct gpio_chip *chip, unsigned int offset)
2313 {
2314 u32 reg;
2315
2316 offset += 8;
2317
2318 reg = gpmc_read_reg(GPMC_STATUS) & BIT(offset);
2319
2320 return !!reg;
2321 }
2322
2323 static int gpmc_gpio_init(struct gpmc_device *gpmc)
2324 {
2325 int ret;
2326
2327 gpmc->gpio_chip.parent = gpmc->dev;
2328 gpmc->gpio_chip.owner = THIS_MODULE;
2329 gpmc->gpio_chip.label = DEVICE_NAME;
2330 gpmc->gpio_chip.ngpio = gpmc_nr_waitpins;
2331 gpmc->gpio_chip.get_direction = gpmc_gpio_get_direction;
2332 gpmc->gpio_chip.direction_input = gpmc_gpio_direction_input;
2333 gpmc->gpio_chip.direction_output = gpmc_gpio_direction_output;
2334 gpmc->gpio_chip.set = gpmc_gpio_set;
2335 gpmc->gpio_chip.get = gpmc_gpio_get;
2336 gpmc->gpio_chip.base = -1;
2337
2338 ret = devm_gpiochip_add_data(gpmc->dev, &gpmc->gpio_chip, NULL);
2339 if (ret < 0) {
2340 dev_err(gpmc->dev, "could not register gpio chip: %d\n", ret);
2341 return ret;
2342 }
2343
2344 return 0;
2345 }
2346
2347 static int gpmc_probe(struct platform_device *pdev)
2348 {
2349 int rc;
2350 u32 l;
2351 struct resource *res;
2352 struct gpmc_device *gpmc;
2353
2354 gpmc = devm_kzalloc(&pdev->dev, sizeof(*gpmc), GFP_KERNEL);
2355 if (!gpmc)
2356 return -ENOMEM;
2357
2358 gpmc->dev = &pdev->dev;
2359 platform_set_drvdata(pdev, gpmc);
2360
2361 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2362 if (res == NULL)
2363 return -ENOENT;
2364
2365 phys_base = res->start;
2366 mem_size = resource_size(res);
2367
2368 gpmc_base = devm_ioremap_resource(&pdev->dev, res);
2369 if (IS_ERR(gpmc_base))
2370 return PTR_ERR(gpmc_base);
2371
2372 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
2373 if (!res) {
2374 dev_err(&pdev->dev, "Failed to get resource: irq\n");
2375 return -ENOENT;
2376 }
2377
2378 gpmc->irq = res->start;
2379
2380 gpmc_l3_clk = devm_clk_get(&pdev->dev, "fck");
2381 if (IS_ERR(gpmc_l3_clk)) {
2382 dev_err(&pdev->dev, "Failed to get GPMC fck\n");
2383 return PTR_ERR(gpmc_l3_clk);
2384 }
2385
2386 if (!clk_get_rate(gpmc_l3_clk)) {
2387 dev_err(&pdev->dev, "Invalid GPMC fck clock rate\n");
2388 return -EINVAL;
2389 }
2390
2391 if (pdev->dev.of_node) {
2392 rc = gpmc_probe_dt(pdev);
2393 if (rc)
2394 return rc;
2395 } else {
2396 gpmc_cs_num = GPMC_CS_NUM;
2397 gpmc_nr_waitpins = GPMC_NR_WAITPINS;
2398 }
2399
2400 pm_runtime_enable(&pdev->dev);
2401 pm_runtime_get_sync(&pdev->dev);
2402
2403 l = gpmc_read_reg(GPMC_REVISION);
2404
2405 /*
2406 * FIXME: Once device-tree migration is complete the below flags
2407 * should be populated based upon the device-tree compatible
2408 * string. For now just use the IP revision. OMAP3+ devices have
2409 * the wr_access and wr_data_mux_bus register fields. OMAP4+
2410 * devices support the addr-addr-data multiplex protocol.
2411 *
2412 * GPMC IP revisions:
2413 * - OMAP24xx = 2.0
2414 * - OMAP3xxx = 5.0
2415 * - OMAP44xx/54xx/AM335x = 6.0
2416 */
2417 if (GPMC_REVISION_MAJOR(l) > 0x4)
2418 gpmc_capability = GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS;
2419 if (GPMC_REVISION_MAJOR(l) > 0x5)
2420 gpmc_capability |= GPMC_HAS_MUX_AAD;
2421 dev_info(gpmc->dev, "GPMC revision %d.%d\n", GPMC_REVISION_MAJOR(l),
2422 GPMC_REVISION_MINOR(l));
2423
2424 gpmc_mem_init();
2425 rc = gpmc_gpio_init(gpmc);
2426 if (rc)
2427 goto gpio_init_failed;
2428
2429 gpmc->nirqs = GPMC_NR_NAND_IRQS + gpmc_nr_waitpins;
2430 rc = gpmc_setup_irq(gpmc);
2431 if (rc) {
2432 dev_err(gpmc->dev, "gpmc_setup_irq failed\n");
2433 goto gpio_init_failed;
2434 }
2435
2436 gpmc_probe_dt_children(pdev);
2437
2438 return 0;
2439
2440 gpio_init_failed:
2441 gpmc_mem_exit();
2442 pm_runtime_put_sync(&pdev->dev);
2443 pm_runtime_disable(&pdev->dev);
2444
2445 return rc;
2446 }
2447
2448 static int gpmc_remove(struct platform_device *pdev)
2449 {
2450 struct gpmc_device *gpmc = platform_get_drvdata(pdev);
2451
2452 gpmc_free_irq(gpmc);
2453 gpmc_mem_exit();
2454 pm_runtime_put_sync(&pdev->dev);
2455 pm_runtime_disable(&pdev->dev);
2456
2457 return 0;
2458 }
2459
2460 #ifdef CONFIG_PM_SLEEP
2461 static int gpmc_suspend(struct device *dev)
2462 {
2463 omap3_gpmc_save_context();
2464 pm_runtime_put_sync(dev);
2465 return 0;
2466 }
2467
2468 static int gpmc_resume(struct device *dev)
2469 {
2470 pm_runtime_get_sync(dev);
2471 omap3_gpmc_restore_context();
2472 return 0;
2473 }
2474 #endif
2475
2476 static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume);
2477
2478 static struct platform_driver gpmc_driver = {
2479 .probe = gpmc_probe,
2480 .remove = gpmc_remove,
2481 .driver = {
2482 .name = DEVICE_NAME,
2483 .of_match_table = of_match_ptr(gpmc_dt_ids),
2484 .pm = &gpmc_pm_ops,
2485 },
2486 };
2487
2488 static __init int gpmc_init(void)
2489 {
2490 return platform_driver_register(&gpmc_driver);
2491 }
2492 postcore_initcall(gpmc_init);
2493
2494 static struct omap3_gpmc_regs gpmc_context;
2495
2496 void omap3_gpmc_save_context(void)
2497 {
2498 int i;
2499
2500 if (!gpmc_base)
2501 return;
2502
2503 gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
2504 gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
2505 gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
2506 gpmc_context.config = gpmc_read_reg(GPMC_CONFIG);
2507 gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
2508 gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
2509 gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
2510 for (i = 0; i < gpmc_cs_num; i++) {
2511 gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
2512 if (gpmc_context.cs_context[i].is_valid) {
2513 gpmc_context.cs_context[i].config1 =
2514 gpmc_cs_read_reg(i, GPMC_CS_CONFIG1);
2515 gpmc_context.cs_context[i].config2 =
2516 gpmc_cs_read_reg(i, GPMC_CS_CONFIG2);
2517 gpmc_context.cs_context[i].config3 =
2518 gpmc_cs_read_reg(i, GPMC_CS_CONFIG3);
2519 gpmc_context.cs_context[i].config4 =
2520 gpmc_cs_read_reg(i, GPMC_CS_CONFIG4);
2521 gpmc_context.cs_context[i].config5 =
2522 gpmc_cs_read_reg(i, GPMC_CS_CONFIG5);
2523 gpmc_context.cs_context[i].config6 =
2524 gpmc_cs_read_reg(i, GPMC_CS_CONFIG6);
2525 gpmc_context.cs_context[i].config7 =
2526 gpmc_cs_read_reg(i, GPMC_CS_CONFIG7);
2527 }
2528 }
2529 }
2530
2531 void omap3_gpmc_restore_context(void)
2532 {
2533 int i;
2534
2535 if (!gpmc_base)
2536 return;
2537
2538 gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
2539 gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
2540 gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);
2541 gpmc_write_reg(GPMC_CONFIG, gpmc_context.config);
2542 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
2543 gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
2544 gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
2545 for (i = 0; i < gpmc_cs_num; i++) {
2546 if (gpmc_context.cs_context[i].is_valid) {
2547 gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
2548 gpmc_context.cs_context[i].config1);
2549 gpmc_cs_write_reg(i, GPMC_CS_CONFIG2,
2550 gpmc_context.cs_context[i].config2);
2551 gpmc_cs_write_reg(i, GPMC_CS_CONFIG3,
2552 gpmc_context.cs_context[i].config3);
2553 gpmc_cs_write_reg(i, GPMC_CS_CONFIG4,
2554 gpmc_context.cs_context[i].config4);
2555 gpmc_cs_write_reg(i, GPMC_CS_CONFIG5,
2556 gpmc_context.cs_context[i].config5);
2557 gpmc_cs_write_reg(i, GPMC_CS_CONFIG6,
2558 gpmc_context.cs_context[i].config6);
2559 gpmc_cs_write_reg(i, GPMC_CS_CONFIG7,
2560 gpmc_context.cs_context[i].config7);
2561 }
2562 }
2563 }
Linux with added FPC-III support