1 /*
2 * Copyright (C) 2012 Altera Corporation <www.altera.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * - Neither the name of the Altera Corporation nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL ALTERA CORPORATION BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <common.h>
29 #include <asm/io.h>
30 #include <linux/errno.h>
31 #include <wait_bit.h>
32 #include <spi.h>
33 #include <malloc.h>
34 #include "cadence_qspi.h"
35
36 #define CQSPI_REG_POLL_US 1 /* 1us */
37 #define CQSPI_REG_RETRY 10000
38 #define CQSPI_POLL_IDLE_RETRY 3
39
40 /* Transfer mode */
41 #define CQSPI_INST_TYPE_SINGLE 0
42 #define CQSPI_INST_TYPE_DUAL 1
43 #define CQSPI_INST_TYPE_QUAD 2
44
45 #define CQSPI_STIG_DATA_LEN_MAX 8
46
47 #define CQSPI_DUMMY_CLKS_PER_BYTE 8
48 #define CQSPI_DUMMY_BYTES_MAX 4
49
50 /****************************************************************************
51 * Controller's configuration and status register (offset from QSPI_BASE)
52 ****************************************************************************/
53 #define CQSPI_REG_CONFIG 0x00
54 #define CQSPI_REG_CONFIG_ENABLE BIT(0)
55 #define CQSPI_REG_CONFIG_CLK_POL BIT(1)
56 #define CQSPI_REG_CONFIG_CLK_PHA BIT(2)
57 #define CQSPI_REG_CONFIG_DIRECT BIT(7)
58 #define CQSPI_REG_CONFIG_DECODE BIT(9)
59 #define CQSPI_REG_CONFIG_XIP_IMM BIT(18)
60 #define CQSPI_REG_CONFIG_CHIPSELECT_LSB 10
61 #define CQSPI_REG_CONFIG_BAUD_LSB 19
62 #define CQSPI_REG_CONFIG_IDLE_LSB 31
63 #define CQSPI_REG_CONFIG_CHIPSELECT_MASK 0xF
64 #define CQSPI_REG_CONFIG_BAUD_MASK 0xF
65
66 #define CQSPI_REG_RD_INSTR 0x04
67 #define CQSPI_REG_RD_INSTR_OPCODE_LSB 0
68 #define CQSPI_REG_RD_INSTR_TYPE_INSTR_LSB 8
69 #define CQSPI_REG_RD_INSTR_TYPE_ADDR_LSB 12
70 #define CQSPI_REG_RD_INSTR_TYPE_DATA_LSB 16
71 #define CQSPI_REG_RD_INSTR_MODE_EN_LSB 20
72 #define CQSPI_REG_RD_INSTR_DUMMY_LSB 24
73 #define CQSPI_REG_RD_INSTR_TYPE_INSTR_MASK 0x3
74 #define CQSPI_REG_RD_INSTR_TYPE_ADDR_MASK 0x3
75 #define CQSPI_REG_RD_INSTR_TYPE_DATA_MASK 0x3
76 #define CQSPI_REG_RD_INSTR_DUMMY_MASK 0x1F
77
78 #define CQSPI_REG_WR_INSTR 0x08
79 #define CQSPI_REG_WR_INSTR_OPCODE_LSB 0
80
81 #define CQSPI_REG_DELAY 0x0C
82 #define CQSPI_REG_DELAY_TSLCH_LSB 0
83 #define CQSPI_REG_DELAY_TCHSH_LSB 8
84 #define CQSPI_REG_DELAY_TSD2D_LSB 16
85 #define CQSPI_REG_DELAY_TSHSL_LSB 24
86 #define CQSPI_REG_DELAY_TSLCH_MASK 0xFF
87 #define CQSPI_REG_DELAY_TCHSH_MASK 0xFF
88 #define CQSPI_REG_DELAY_TSD2D_MASK 0xFF
89 #define CQSPI_REG_DELAY_TSHSL_MASK 0xFF
90
91 #define CQSPI_REG_RD_DATA_CAPTURE 0x10
92 #define CQSPI_REG_RD_DATA_CAPTURE_BYPASS BIT(0)
93 #define CQSPI_REG_RD_DATA_CAPTURE_DELAY_LSB 1
94 #define CQSPI_REG_RD_DATA_CAPTURE_DELAY_MASK 0xF
95
96 #define CQSPI_REG_SIZE 0x14
97 #define CQSPI_REG_SIZE_ADDRESS_LSB 0
98 #define CQSPI_REG_SIZE_PAGE_LSB 4
99 #define CQSPI_REG_SIZE_BLOCK_LSB 16
100 #define CQSPI_REG_SIZE_ADDRESS_MASK 0xF
101 #define CQSPI_REG_SIZE_PAGE_MASK 0xFFF
102 #define CQSPI_REG_SIZE_BLOCK_MASK 0x3F
103
104 #define CQSPI_REG_SRAMPARTITION 0x18
105 #define CQSPI_REG_INDIRECTTRIGGER 0x1C
106
107 #define CQSPI_REG_REMAP 0x24
108 #define CQSPI_REG_MODE_BIT 0x28
109
110 #define CQSPI_REG_SDRAMLEVEL 0x2C
111 #define CQSPI_REG_SDRAMLEVEL_RD_LSB 0
112 #define CQSPI_REG_SDRAMLEVEL_WR_LSB 16
113 #define CQSPI_REG_SDRAMLEVEL_RD_MASK 0xFFFF
114 #define CQSPI_REG_SDRAMLEVEL_WR_MASK 0xFFFF
115
116 #define CQSPI_REG_IRQSTATUS 0x40
117 #define CQSPI_REG_IRQMASK 0x44
118
119 #define CQSPI_REG_INDIRECTRD 0x60
120 #define CQSPI_REG_INDIRECTRD_START BIT(0)
121 #define CQSPI_REG_INDIRECTRD_CANCEL BIT(1)
122 #define CQSPI_REG_INDIRECTRD_INPROGRESS BIT(2)
123 #define CQSPI_REG_INDIRECTRD_DONE BIT(5)
124
125 #define CQSPI_REG_INDIRECTRDWATERMARK 0x64
126 #define CQSPI_REG_INDIRECTRDSTARTADDR 0x68
127 #define CQSPI_REG_INDIRECTRDBYTES 0x6C
128
129 #define CQSPI_REG_CMDCTRL 0x90
130 #define CQSPI_REG_CMDCTRL_EXECUTE BIT(0)
131 #define CQSPI_REG_CMDCTRL_INPROGRESS BIT(1)
132 #define CQSPI_REG_CMDCTRL_DUMMY_LSB 7
133 #define CQSPI_REG_CMDCTRL_WR_BYTES_LSB 12
134 #define CQSPI_REG_CMDCTRL_WR_EN_LSB 15
135 #define CQSPI_REG_CMDCTRL_ADD_BYTES_LSB 16
136 #define CQSPI_REG_CMDCTRL_ADDR_EN_LSB 19
137 #define CQSPI_REG_CMDCTRL_RD_BYTES_LSB 20
138 #define CQSPI_REG_CMDCTRL_RD_EN_LSB 23
139 #define CQSPI_REG_CMDCTRL_OPCODE_LSB 24
140 #define CQSPI_REG_CMDCTRL_DUMMY_MASK 0x1F
141 #define CQSPI_REG_CMDCTRL_WR_BYTES_MASK 0x7
142 #define CQSPI_REG_CMDCTRL_ADD_BYTES_MASK 0x3
143 #define CQSPI_REG_CMDCTRL_RD_BYTES_MASK 0x7
144 #define CQSPI_REG_CMDCTRL_OPCODE_MASK 0xFF
145
146 #define CQSPI_REG_INDIRECTWR 0x70
147 #define CQSPI_REG_INDIRECTWR_START BIT(0)
148 #define CQSPI_REG_INDIRECTWR_CANCEL BIT(1)
149 #define CQSPI_REG_INDIRECTWR_INPROGRESS BIT(2)
150 #define CQSPI_REG_INDIRECTWR_DONE BIT(5)
151
152 #define CQSPI_REG_INDIRECTWRWATERMARK 0x74
153 #define CQSPI_REG_INDIRECTWRSTARTADDR 0x78
154 #define CQSPI_REG_INDIRECTWRBYTES 0x7C
155
156 #define CQSPI_REG_CMDADDRESS 0x94
157 #define CQSPI_REG_CMDREADDATALOWER 0xA0
158 #define CQSPI_REG_CMDREADDATAUPPER 0xA4
159 #define CQSPI_REG_CMDWRITEDATALOWER 0xA8
160 #define CQSPI_REG_CMDWRITEDATAUPPER 0xAC
161
162 #define CQSPI_REG_IS_IDLE(base) \
163 ((readl(base + CQSPI_REG_CONFIG) >> \
164 CQSPI_REG_CONFIG_IDLE_LSB) & 0x1)
165
166 #define CQSPI_GET_RD_SRAM_LEVEL(reg_base) \
167 (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \
168 CQSPI_REG_SDRAMLEVEL_RD_LSB) & CQSPI_REG_SDRAMLEVEL_RD_MASK)
169
170 #define CQSPI_GET_WR_SRAM_LEVEL(reg_base) \
171 (((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >> \
172 CQSPI_REG_SDRAMLEVEL_WR_LSB) & CQSPI_REG_SDRAMLEVEL_WR_MASK)
173
cadence_qspi_apb_cmd2addr(const unsigned char * addr_buf,unsigned int addr_width)174 static unsigned int cadence_qspi_apb_cmd2addr(const unsigned char *addr_buf,
175 unsigned int addr_width)
176 {
177 unsigned int addr;
178
179 addr = (addr_buf[0] << 16) | (addr_buf[1] << 8) | addr_buf[2];
180
181 if (addr_width == 4)
182 addr = (addr << 8) | addr_buf[3];
183
184 return addr;
185 }
186
cadence_qspi_apb_controller_enable(void * reg_base)187 void cadence_qspi_apb_controller_enable(void *reg_base)
188 {
189 unsigned int reg;
190 reg = readl(reg_base + CQSPI_REG_CONFIG);
191 reg |= CQSPI_REG_CONFIG_ENABLE;
192 writel(reg, reg_base + CQSPI_REG_CONFIG);
193 }
194
cadence_qspi_apb_controller_disable(void * reg_base)195 void cadence_qspi_apb_controller_disable(void *reg_base)
196 {
197 unsigned int reg;
198 reg = readl(reg_base + CQSPI_REG_CONFIG);
199 reg &= ~CQSPI_REG_CONFIG_ENABLE;
200 writel(reg, reg_base + CQSPI_REG_CONFIG);
201 }
202
203 /* Return 1 if idle, otherwise return 0 (busy). */
cadence_qspi_wait_idle(void * reg_base)204 static unsigned int cadence_qspi_wait_idle(void *reg_base)
205 {
206 unsigned int start, count = 0;
207 /* timeout in unit of ms */
208 unsigned int timeout = 5000;
209
210 start = get_timer(0);
211 for ( ; get_timer(start) < timeout ; ) {
212 if (CQSPI_REG_IS_IDLE(reg_base))
213 count++;
214 else
215 count = 0;
216 /*
217 * Ensure the QSPI controller is in true idle state after
218 * reading back the same idle status consecutively
219 */
220 if (count >= CQSPI_POLL_IDLE_RETRY)
221 return 1;
222 }
223
224 /* Timeout, still in busy mode. */
225 printf("QSPI: QSPI is still busy after poll for %d times.\n",
226 CQSPI_REG_RETRY);
227 return 0;
228 }
229
cadence_qspi_apb_readdata_capture(void * reg_base,unsigned int bypass,unsigned int delay)230 void cadence_qspi_apb_readdata_capture(void *reg_base,
231 unsigned int bypass, unsigned int delay)
232 {
233 unsigned int reg;
234 cadence_qspi_apb_controller_disable(reg_base);
235
236 reg = readl(reg_base + CQSPI_REG_RD_DATA_CAPTURE);
237
238 if (bypass)
239 reg |= CQSPI_REG_RD_DATA_CAPTURE_BYPASS;
240 else
241 reg &= ~CQSPI_REG_RD_DATA_CAPTURE_BYPASS;
242
243 reg &= ~(CQSPI_REG_RD_DATA_CAPTURE_DELAY_MASK
244 << CQSPI_REG_RD_DATA_CAPTURE_DELAY_LSB);
245
246 reg |= (delay & CQSPI_REG_RD_DATA_CAPTURE_DELAY_MASK)
247 << CQSPI_REG_RD_DATA_CAPTURE_DELAY_LSB;
248
249 writel(reg, reg_base + CQSPI_REG_RD_DATA_CAPTURE);
250
251 cadence_qspi_apb_controller_enable(reg_base);
252 }
253
cadence_qspi_apb_config_baudrate_div(void * reg_base,unsigned int ref_clk_hz,unsigned int sclk_hz)254 void cadence_qspi_apb_config_baudrate_div(void *reg_base,
255 unsigned int ref_clk_hz, unsigned int sclk_hz)
256 {
257 unsigned int reg;
258 unsigned int div;
259
260 cadence_qspi_apb_controller_disable(reg_base);
261 reg = readl(reg_base + CQSPI_REG_CONFIG);
262 reg &= ~(CQSPI_REG_CONFIG_BAUD_MASK << CQSPI_REG_CONFIG_BAUD_LSB);
263
264 /*
265 * The baud_div field in the config reg is 4 bits, and the ref clock is
266 * divided by 2 * (baud_div + 1). Round up the divider to ensure the
267 * SPI clock rate is less than or equal to the requested clock rate.
268 */
269 div = DIV_ROUND_UP(ref_clk_hz, sclk_hz * 2) - 1;
270
271 /* ensure the baud rate doesn't exceed the max value */
272 if (div > CQSPI_REG_CONFIG_BAUD_MASK)
273 div = CQSPI_REG_CONFIG_BAUD_MASK;
274
275 debug("%s: ref_clk %dHz sclk %dHz Div 0x%x, actual %dHz\n", __func__,
276 ref_clk_hz, sclk_hz, div, ref_clk_hz / (2 * (div + 1)));
277
278 reg |= (div << CQSPI_REG_CONFIG_BAUD_LSB);
279 writel(reg, reg_base + CQSPI_REG_CONFIG);
280
281 cadence_qspi_apb_controller_enable(reg_base);
282 }
283
cadence_qspi_apb_set_clk_mode(void * reg_base,uint mode)284 void cadence_qspi_apb_set_clk_mode(void *reg_base, uint mode)
285 {
286 unsigned int reg;
287
288 cadence_qspi_apb_controller_disable(reg_base);
289 reg = readl(reg_base + CQSPI_REG_CONFIG);
290 reg &= ~(CQSPI_REG_CONFIG_CLK_POL | CQSPI_REG_CONFIG_CLK_PHA);
291
292 if (mode & SPI_CPOL)
293 reg |= CQSPI_REG_CONFIG_CLK_POL;
294 if (mode & SPI_CPHA)
295 reg |= CQSPI_REG_CONFIG_CLK_PHA;
296
297 writel(reg, reg_base + CQSPI_REG_CONFIG);
298
299 cadence_qspi_apb_controller_enable(reg_base);
300 }
301
cadence_qspi_apb_chipselect(void * reg_base,unsigned int chip_select,unsigned int decoder_enable)302 void cadence_qspi_apb_chipselect(void *reg_base,
303 unsigned int chip_select, unsigned int decoder_enable)
304 {
305 unsigned int reg;
306
307 cadence_qspi_apb_controller_disable(reg_base);
308
309 debug("%s : chipselect %d decode %d\n", __func__, chip_select,
310 decoder_enable);
311
312 reg = readl(reg_base + CQSPI_REG_CONFIG);
313 /* docoder */
314 if (decoder_enable) {
315 reg |= CQSPI_REG_CONFIG_DECODE;
316 } else {
317 reg &= ~CQSPI_REG_CONFIG_DECODE;
318 /* Convert CS if without decoder.
319 * CS0 to 4b'1110
320 * CS1 to 4b'1101
321 * CS2 to 4b'1011
322 * CS3 to 4b'0111
323 */
324 chip_select = 0xF & ~(1 << chip_select);
325 }
326
327 reg &= ~(CQSPI_REG_CONFIG_CHIPSELECT_MASK
328 << CQSPI_REG_CONFIG_CHIPSELECT_LSB);
329 reg |= (chip_select & CQSPI_REG_CONFIG_CHIPSELECT_MASK)
330 << CQSPI_REG_CONFIG_CHIPSELECT_LSB;
331 writel(reg, reg_base + CQSPI_REG_CONFIG);
332
333 cadence_qspi_apb_controller_enable(reg_base);
334 }
335
cadence_qspi_apb_delay(void * reg_base,unsigned int ref_clk,unsigned int sclk_hz,unsigned int tshsl_ns,unsigned int tsd2d_ns,unsigned int tchsh_ns,unsigned int tslch_ns)336 void cadence_qspi_apb_delay(void *reg_base,
337 unsigned int ref_clk, unsigned int sclk_hz,
338 unsigned int tshsl_ns, unsigned int tsd2d_ns,
339 unsigned int tchsh_ns, unsigned int tslch_ns)
340 {
341 unsigned int ref_clk_ns;
342 unsigned int sclk_ns;
343 unsigned int tshsl, tchsh, tslch, tsd2d;
344 unsigned int reg;
345
346 cadence_qspi_apb_controller_disable(reg_base);
347
348 /* Convert to ns. */
349 ref_clk_ns = DIV_ROUND_UP(1000000000, ref_clk);
350
351 /* Convert to ns. */
352 sclk_ns = DIV_ROUND_UP(1000000000, sclk_hz);
353
354 /* The controller adds additional delay to that programmed in the reg */
355 if (tshsl_ns >= sclk_ns + ref_clk_ns)
356 tshsl_ns -= sclk_ns + ref_clk_ns;
357 if (tchsh_ns >= sclk_ns + 3 * ref_clk_ns)
358 tchsh_ns -= sclk_ns + 3 * ref_clk_ns;
359 tshsl = DIV_ROUND_UP(tshsl_ns, ref_clk_ns);
360 tchsh = DIV_ROUND_UP(tchsh_ns, ref_clk_ns);
361 tslch = DIV_ROUND_UP(tslch_ns, ref_clk_ns);
362 tsd2d = DIV_ROUND_UP(tsd2d_ns, ref_clk_ns);
363
364 reg = ((tshsl & CQSPI_REG_DELAY_TSHSL_MASK)
365 << CQSPI_REG_DELAY_TSHSL_LSB);
366 reg |= ((tchsh & CQSPI_REG_DELAY_TCHSH_MASK)
367 << CQSPI_REG_DELAY_TCHSH_LSB);
368 reg |= ((tslch & CQSPI_REG_DELAY_TSLCH_MASK)
369 << CQSPI_REG_DELAY_TSLCH_LSB);
370 reg |= ((tsd2d & CQSPI_REG_DELAY_TSD2D_MASK)
371 << CQSPI_REG_DELAY_TSD2D_LSB);
372 writel(reg, reg_base + CQSPI_REG_DELAY);
373
374 cadence_qspi_apb_controller_enable(reg_base);
375 }
376
cadence_qspi_apb_controller_init(struct cadence_spi_platdata * plat)377 void cadence_qspi_apb_controller_init(struct cadence_spi_platdata *plat)
378 {
379 unsigned reg;
380
381 cadence_qspi_apb_controller_disable(plat->regbase);
382
383 /* Configure the device size and address bytes */
384 reg = readl(plat->regbase + CQSPI_REG_SIZE);
385 /* Clear the previous value */
386 reg &= ~(CQSPI_REG_SIZE_PAGE_MASK << CQSPI_REG_SIZE_PAGE_LSB);
387 reg &= ~(CQSPI_REG_SIZE_BLOCK_MASK << CQSPI_REG_SIZE_BLOCK_LSB);
388 reg |= (plat->page_size << CQSPI_REG_SIZE_PAGE_LSB);
389 reg |= (plat->block_size << CQSPI_REG_SIZE_BLOCK_LSB);
390 writel(reg, plat->regbase + CQSPI_REG_SIZE);
391
392 /* Configure the remap address register, no remap */
393 writel(0, plat->regbase + CQSPI_REG_REMAP);
394
395 /* Indirect mode configurations */
396 writel(plat->fifo_depth / 2, plat->regbase + CQSPI_REG_SRAMPARTITION);
397
398 /* Disable all interrupts */
399 writel(0, plat->regbase + CQSPI_REG_IRQMASK);
400
401 cadence_qspi_apb_controller_enable(plat->regbase);
402 }
403
cadence_qspi_apb_exec_flash_cmd(void * reg_base,unsigned int reg)404 static int cadence_qspi_apb_exec_flash_cmd(void *reg_base,
405 unsigned int reg)
406 {
407 unsigned int retry = CQSPI_REG_RETRY;
408
409 /* Write the CMDCTRL without start execution. */
410 writel(reg, reg_base + CQSPI_REG_CMDCTRL);
411 /* Start execute */
412 reg |= CQSPI_REG_CMDCTRL_EXECUTE;
413 writel(reg, reg_base + CQSPI_REG_CMDCTRL);
414
415 while (retry--) {
416 reg = readl(reg_base + CQSPI_REG_CMDCTRL);
417 if ((reg & CQSPI_REG_CMDCTRL_INPROGRESS) == 0)
418 break;
419 udelay(1);
420 }
421
422 if (!retry) {
423 printf("QSPI: flash command execution timeout\n");
424 return -EIO;
425 }
426
427 /* Polling QSPI idle status. */
428 if (!cadence_qspi_wait_idle(reg_base))
429 return -EIO;
430
431 return 0;
432 }
433
434 /* For command RDID, RDSR. */
cadence_qspi_apb_command_read(void * reg_base,unsigned int cmdlen,const u8 * cmdbuf,unsigned int rxlen,u8 * rxbuf)435 int cadence_qspi_apb_command_read(void *reg_base,
436 unsigned int cmdlen, const u8 *cmdbuf, unsigned int rxlen,
437 u8 *rxbuf)
438 {
439 unsigned int reg;
440 unsigned int read_len;
441 int status;
442
443 if (!cmdlen || rxlen > CQSPI_STIG_DATA_LEN_MAX || rxbuf == NULL) {
444 printf("QSPI: Invalid input arguments cmdlen %d rxlen %d\n",
445 cmdlen, rxlen);
446 return -EINVAL;
447 }
448
449 reg = cmdbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
450
451 reg |= (0x1 << CQSPI_REG_CMDCTRL_RD_EN_LSB);
452
453 /* 0 means 1 byte. */
454 reg |= (((rxlen - 1) & CQSPI_REG_CMDCTRL_RD_BYTES_MASK)
455 << CQSPI_REG_CMDCTRL_RD_BYTES_LSB);
456 status = cadence_qspi_apb_exec_flash_cmd(reg_base, reg);
457 if (status != 0)
458 return status;
459
460 reg = readl(reg_base + CQSPI_REG_CMDREADDATALOWER);
461
462 /* Put the read value into rx_buf */
463 read_len = (rxlen > 4) ? 4 : rxlen;
464 memcpy(rxbuf, ®, read_len);
465 rxbuf += read_len;
466
467 if (rxlen > 4) {
468 reg = readl(reg_base + CQSPI_REG_CMDREADDATAUPPER);
469
470 read_len = rxlen - read_len;
471 memcpy(rxbuf, ®, read_len);
472 }
473 return 0;
474 }
475
476 /* For commands: WRSR, WREN, WRDI, CHIP_ERASE, BE, etc. */
cadence_qspi_apb_command_write(void * reg_base,unsigned int cmdlen,const u8 * cmdbuf,unsigned int txlen,const u8 * txbuf)477 int cadence_qspi_apb_command_write(void *reg_base, unsigned int cmdlen,
478 const u8 *cmdbuf, unsigned int txlen, const u8 *txbuf)
479 {
480 unsigned int reg = 0;
481 unsigned int addr_value;
482 unsigned int wr_data;
483 unsigned int wr_len;
484
485 if (!cmdlen || cmdlen > 5 || txlen > 8 || cmdbuf == NULL) {
486 printf("QSPI: Invalid input arguments cmdlen %d txlen %d\n",
487 cmdlen, txlen);
488 return -EINVAL;
489 }
490
491 reg |= cmdbuf[0] << CQSPI_REG_CMDCTRL_OPCODE_LSB;
492
493 if (cmdlen == 4 || cmdlen == 5) {
494 /* Command with address */
495 reg |= (0x1 << CQSPI_REG_CMDCTRL_ADDR_EN_LSB);
496 /* Number of bytes to write. */
497 reg |= ((cmdlen - 2) & CQSPI_REG_CMDCTRL_ADD_BYTES_MASK)
498 << CQSPI_REG_CMDCTRL_ADD_BYTES_LSB;
499 /* Get address */
500 addr_value = cadence_qspi_apb_cmd2addr(&cmdbuf[1],
501 cmdlen >= 5 ? 4 : 3);
502
503 writel(addr_value, reg_base + CQSPI_REG_CMDADDRESS);
504 }
505
506 if (txlen) {
507 /* writing data = yes */
508 reg |= (0x1 << CQSPI_REG_CMDCTRL_WR_EN_LSB);
509 reg |= ((txlen - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
510 << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
511
512 wr_len = txlen > 4 ? 4 : txlen;
513 memcpy(&wr_data, txbuf, wr_len);
514 writel(wr_data, reg_base +
515 CQSPI_REG_CMDWRITEDATALOWER);
516
517 if (txlen > 4) {
518 txbuf += wr_len;
519 wr_len = txlen - wr_len;
520 memcpy(&wr_data, txbuf, wr_len);
521 writel(wr_data, reg_base +
522 CQSPI_REG_CMDWRITEDATAUPPER);
523 }
524 }
525
526 /* Execute the command */
527 return cadence_qspi_apb_exec_flash_cmd(reg_base, reg);
528 }
529
530 /* Opcode + Address (3/4 bytes) + dummy bytes (0-4 bytes) */
cadence_qspi_apb_indirect_read_setup(struct cadence_spi_platdata * plat,unsigned int cmdlen,unsigned int rx_width,const u8 * cmdbuf)531 int cadence_qspi_apb_indirect_read_setup(struct cadence_spi_platdata *plat,
532 unsigned int cmdlen, unsigned int rx_width, const u8 *cmdbuf)
533 {
534 unsigned int reg;
535 unsigned int rd_reg;
536 unsigned int addr_value;
537 unsigned int dummy_clk;
538 unsigned int dummy_bytes;
539 unsigned int addr_bytes;
540
541 /*
542 * Identify addr_byte. All NOR flash device drivers are using fast read
543 * which always expecting 1 dummy byte, 1 cmd byte and 3/4 addr byte.
544 * With that, the length is in value of 5 or 6. Only FRAM chip from
545 * ramtron using normal read (which won't need dummy byte).
546 * Unlikely NOR flash using normal read due to performance issue.
547 */
548 if (cmdlen >= 5)
549 /* to cater fast read where cmd + addr + dummy */
550 addr_bytes = cmdlen - 2;
551 else
552 /* for normal read (only ramtron as of now) */
553 addr_bytes = cmdlen - 1;
554
555 /* Setup the indirect trigger address */
556 writel(plat->trigger_address,
557 plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
558
559 /* Configure the opcode */
560 rd_reg = cmdbuf[0] << CQSPI_REG_RD_INSTR_OPCODE_LSB;
561
562 if (rx_width & SPI_RX_QUAD)
563 /* Instruction and address at DQ0, data at DQ0-3. */
564 rd_reg |= CQSPI_INST_TYPE_QUAD << CQSPI_REG_RD_INSTR_TYPE_DATA_LSB;
565
566 /* Get address */
567 addr_value = cadence_qspi_apb_cmd2addr(&cmdbuf[1], addr_bytes);
568 writel(addr_value, plat->regbase + CQSPI_REG_INDIRECTRDSTARTADDR);
569
570 /* The remaining lenght is dummy bytes. */
571 dummy_bytes = cmdlen - addr_bytes - 1;
572 if (dummy_bytes) {
573 if (dummy_bytes > CQSPI_DUMMY_BYTES_MAX)
574 dummy_bytes = CQSPI_DUMMY_BYTES_MAX;
575
576 rd_reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
577 #if defined(CONFIG_SPL_SPI_XIP) && defined(CONFIG_SPL_BUILD)
578 writel(0x0, plat->regbase + CQSPI_REG_MODE_BIT);
579 #else
580 writel(0xFF, plat->regbase + CQSPI_REG_MODE_BIT);
581 #endif
582
583 /* Convert to clock cycles. */
584 dummy_clk = dummy_bytes * CQSPI_DUMMY_CLKS_PER_BYTE;
585 /* Need to minus the mode byte (8 clocks). */
586 dummy_clk -= CQSPI_DUMMY_CLKS_PER_BYTE;
587
588 if (dummy_clk)
589 rd_reg |= (dummy_clk & CQSPI_REG_RD_INSTR_DUMMY_MASK)
590 << CQSPI_REG_RD_INSTR_DUMMY_LSB;
591 }
592
593 writel(rd_reg, plat->regbase + CQSPI_REG_RD_INSTR);
594
595 /* set device size */
596 reg = readl(plat->regbase + CQSPI_REG_SIZE);
597 reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
598 reg |= (addr_bytes - 1);
599 writel(reg, plat->regbase + CQSPI_REG_SIZE);
600 return 0;
601 }
602
cadence_qspi_get_rd_sram_level(struct cadence_spi_platdata * plat)603 static u32 cadence_qspi_get_rd_sram_level(struct cadence_spi_platdata *plat)
604 {
605 u32 reg = readl(plat->regbase + CQSPI_REG_SDRAMLEVEL);
606 reg >>= CQSPI_REG_SDRAMLEVEL_RD_LSB;
607 return reg & CQSPI_REG_SDRAMLEVEL_RD_MASK;
608 }
609
cadence_qspi_wait_for_data(struct cadence_spi_platdata * plat)610 static int cadence_qspi_wait_for_data(struct cadence_spi_platdata *plat)
611 {
612 unsigned int timeout = 10000;
613 u32 reg;
614
615 while (timeout--) {
616 reg = cadence_qspi_get_rd_sram_level(plat);
617 if (reg)
618 return reg;
619 udelay(1);
620 }
621
622 return -ETIMEDOUT;
623 }
624
cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata * plat,unsigned int n_rx,u8 * rxbuf)625 int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
626 unsigned int n_rx, u8 *rxbuf)
627 {
628 unsigned int remaining = n_rx;
629 unsigned int bytes_to_read = 0;
630 int ret;
631
632 writel(n_rx, plat->regbase + CQSPI_REG_INDIRECTRDBYTES);
633
634 /* Start the indirect read transfer */
635 writel(CQSPI_REG_INDIRECTRD_START,
636 plat->regbase + CQSPI_REG_INDIRECTRD);
637
638 while (remaining > 0) {
639 ret = cadence_qspi_wait_for_data(plat);
640 if (ret < 0) {
641 printf("Indirect write timed out (%i)\n", ret);
642 goto failrd;
643 }
644
645 bytes_to_read = ret;
646
647 while (bytes_to_read != 0) {
648 bytes_to_read *= plat->fifo_width;
649 bytes_to_read = bytes_to_read > remaining ?
650 remaining : bytes_to_read;
651 /*
652 * Handle non-4-byte aligned access to avoid
653 * data abort.
654 */
655 if (((uintptr_t)rxbuf % 4) || (bytes_to_read % 4))
656 readsb(plat->ahbbase, rxbuf, bytes_to_read);
657 else
658 readsl(plat->ahbbase, rxbuf,
659 bytes_to_read >> 2);
660 rxbuf += bytes_to_read;
661 remaining -= bytes_to_read;
662 bytes_to_read = cadence_qspi_get_rd_sram_level(plat);
663 }
664 }
665
666 /* Check indirect done status */
667 ret = wait_for_bit_le32(plat->regbase + CQSPI_REG_INDIRECTRD,
668 CQSPI_REG_INDIRECTRD_DONE, 1, 10, 0);
669 if (ret) {
670 printf("Indirect read completion error (%i)\n", ret);
671 goto failrd;
672 }
673
674 /* Clear indirect completion status */
675 writel(CQSPI_REG_INDIRECTRD_DONE,
676 plat->regbase + CQSPI_REG_INDIRECTRD);
677
678 return 0;
679
680 failrd:
681 /* Cancel the indirect read */
682 writel(CQSPI_REG_INDIRECTRD_CANCEL,
683 plat->regbase + CQSPI_REG_INDIRECTRD);
684 return ret;
685 }
686
687 /* Opcode + Address (3/4 bytes) */
cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata * plat,unsigned int cmdlen,const u8 * cmdbuf)688 int cadence_qspi_apb_indirect_write_setup(struct cadence_spi_platdata *plat,
689 unsigned int cmdlen, const u8 *cmdbuf)
690 {
691 unsigned int reg;
692 unsigned int addr_bytes = cmdlen > 4 ? 4 : 3;
693
694 if (cmdlen < 4 || cmdbuf == NULL) {
695 printf("QSPI: Invalid input argument, len %d cmdbuf %p\n",
696 cmdlen, cmdbuf);
697 return -EINVAL;
698 }
699 /* Setup the indirect trigger address */
700 writel(plat->trigger_address,
701 plat->regbase + CQSPI_REG_INDIRECTTRIGGER);
702
703 /* Configure the opcode */
704 reg = cmdbuf[0] << CQSPI_REG_WR_INSTR_OPCODE_LSB;
705 writel(reg, plat->regbase + CQSPI_REG_WR_INSTR);
706
707 /* Setup write address. */
708 reg = cadence_qspi_apb_cmd2addr(&cmdbuf[1], addr_bytes);
709 writel(reg, plat->regbase + CQSPI_REG_INDIRECTWRSTARTADDR);
710
711 reg = readl(plat->regbase + CQSPI_REG_SIZE);
712 reg &= ~CQSPI_REG_SIZE_ADDRESS_MASK;
713 reg |= (addr_bytes - 1);
714 writel(reg, plat->regbase + CQSPI_REG_SIZE);
715 return 0;
716 }
717
cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata * plat,unsigned int n_tx,const u8 * txbuf)718 int cadence_qspi_apb_indirect_write_execute(struct cadence_spi_platdata *plat,
719 unsigned int n_tx, const u8 *txbuf)
720 {
721 unsigned int page_size = plat->page_size;
722 unsigned int remaining = n_tx;
723 const u8 *bb_txbuf = txbuf;
724 void *bounce_buf = NULL;
725 unsigned int write_bytes;
726 int ret;
727
728 /*
729 * Use bounce buffer for non 32 bit aligned txbuf to avoid data
730 * aborts
731 */
732 if ((uintptr_t)txbuf % 4) {
733 bounce_buf = malloc(n_tx);
734 if (!bounce_buf)
735 return -ENOMEM;
736 memcpy(bounce_buf, txbuf, n_tx);
737 bb_txbuf = bounce_buf;
738 }
739
740 /* Configure the indirect read transfer bytes */
741 writel(n_tx, plat->regbase + CQSPI_REG_INDIRECTWRBYTES);
742
743 /* Start the indirect write transfer */
744 writel(CQSPI_REG_INDIRECTWR_START,
745 plat->regbase + CQSPI_REG_INDIRECTWR);
746
747 while (remaining > 0) {
748 write_bytes = remaining > page_size ? page_size : remaining;
749 writesl(plat->ahbbase, bb_txbuf, write_bytes >> 2);
750 if (write_bytes % 4)
751 writesb(plat->ahbbase,
752 bb_txbuf + rounddown(write_bytes, 4),
753 write_bytes % 4);
754
755 ret = wait_for_bit_le32(plat->regbase + CQSPI_REG_SDRAMLEVEL,
756 CQSPI_REG_SDRAMLEVEL_WR_MASK <<
757 CQSPI_REG_SDRAMLEVEL_WR_LSB, 0, 10, 0);
758 if (ret) {
759 printf("Indirect write timed out (%i)\n", ret);
760 goto failwr;
761 }
762
763 bb_txbuf += write_bytes;
764 remaining -= write_bytes;
765 }
766
767 /* Check indirect done status */
768 ret = wait_for_bit_le32(plat->regbase + CQSPI_REG_INDIRECTWR,
769 CQSPI_REG_INDIRECTWR_DONE, 1, 10, 0);
770 if (ret) {
771 printf("Indirect write completion error (%i)\n", ret);
772 goto failwr;
773 }
774
775 /* Clear indirect completion status */
776 writel(CQSPI_REG_INDIRECTWR_DONE,
777 plat->regbase + CQSPI_REG_INDIRECTWR);
778 if (bounce_buf)
779 free(bounce_buf);
780 return 0;
781
782 failwr:
783 /* Cancel the indirect write */
784 writel(CQSPI_REG_INDIRECTWR_CANCEL,
785 plat->regbase + CQSPI_REG_INDIRECTWR);
786 if (bounce_buf)
787 free(bounce_buf);
788 return ret;
789 }
790
cadence_qspi_apb_enter_xip(void * reg_base,char xip_dummy)791 void cadence_qspi_apb_enter_xip(void *reg_base, char xip_dummy)
792 {
793 unsigned int reg;
794
795 /* enter XiP mode immediately and enable direct mode */
796 reg = readl(reg_base + CQSPI_REG_CONFIG);
797 reg |= CQSPI_REG_CONFIG_ENABLE;
798 reg |= CQSPI_REG_CONFIG_DIRECT;
799 reg |= CQSPI_REG_CONFIG_XIP_IMM;
800 writel(reg, reg_base + CQSPI_REG_CONFIG);
801
802 /* keep the XiP mode */
803 writel(xip_dummy, reg_base + CQSPI_REG_MODE_BIT);
804
805 /* Enable mode bit at devrd */
806 reg = readl(reg_base + CQSPI_REG_RD_INSTR);
807 reg |= (1 << CQSPI_REG_RD_INSTR_MODE_EN_LSB);
808 writel(reg, reg_base + CQSPI_REG_RD_INSTR);
809 }
810