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