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1/*
2 * FPGA Manager Driver for Altera SOCFPGA
3 *
4 * Copyright (C) 2013-2015 Altera Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18#include <linux/completion.h>
19#include <linux/delay.h>
20#include <linux/fpga/fpga-mgr.h>
21#include <linux/interrupt.h>
22#include <linux/io.h>
23#include <linux/module.h>
24#include <linux/of_address.h>
25#include <linux/of_irq.h>
26#include <linux/pm.h>
27
28/* Register offsets */
29#define SOCFPGA_FPGMGR_STAT_OFST 0x0
30#define SOCFPGA_FPGMGR_CTL_OFST 0x4
31#define SOCFPGA_FPGMGR_DCLKCNT_OFST 0x8
32#define SOCFPGA_FPGMGR_DCLKSTAT_OFST 0xc
33#define SOCFPGA_FPGMGR_GPIO_INTEN_OFST 0x830
34#define SOCFPGA_FPGMGR_GPIO_INTMSK_OFST 0x834
35#define SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST 0x838
36#define SOCFPGA_FPGMGR_GPIO_INT_POL_OFST 0x83c
37#define SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST 0x840
38#define SOCFPGA_FPGMGR_GPIO_RAW_INTSTAT_OFST 0x844
39#define SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST 0x84c
40#define SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST 0x850
41
42/* Register bit defines */
43/* SOCFPGA_FPGMGR_STAT register mode field values */
44#define SOCFPGA_FPGMGR_STAT_POWER_UP 0x0 /*ramping*/
45#define SOCFPGA_FPGMGR_STAT_RESET 0x1
46#define SOCFPGA_FPGMGR_STAT_CFG 0x2
47#define SOCFPGA_FPGMGR_STAT_INIT 0x3
48#define SOCFPGA_FPGMGR_STAT_USER_MODE 0x4
49#define SOCFPGA_FPGMGR_STAT_UNKNOWN 0x5
50#define SOCFPGA_FPGMGR_STAT_STATE_MASK 0x7
51/* This is a flag value that doesn't really happen in this register field */
52#define SOCFPGA_FPGMGR_STAT_POWER_OFF 0x0
53
54#define MSEL_PP16_FAST_NOAES_NODC 0x0
55#define MSEL_PP16_FAST_AES_NODC 0x1
56#define MSEL_PP16_FAST_AESOPT_DC 0x2
57#define MSEL_PP16_SLOW_NOAES_NODC 0x4
58#define MSEL_PP16_SLOW_AES_NODC 0x5
59#define MSEL_PP16_SLOW_AESOPT_DC 0x6
60#define MSEL_PP32_FAST_NOAES_NODC 0x8
61#define MSEL_PP32_FAST_AES_NODC 0x9
62#define MSEL_PP32_FAST_AESOPT_DC 0xa
63#define MSEL_PP32_SLOW_NOAES_NODC 0xc
64#define MSEL_PP32_SLOW_AES_NODC 0xd
65#define MSEL_PP32_SLOW_AESOPT_DC 0xe
66#define SOCFPGA_FPGMGR_STAT_MSEL_MASK 0x000000f8
67#define SOCFPGA_FPGMGR_STAT_MSEL_SHIFT 3
68
69/* SOCFPGA_FPGMGR_CTL register */
70#define SOCFPGA_FPGMGR_CTL_EN 0x00000001
71#define SOCFPGA_FPGMGR_CTL_NCE 0x00000002
72#define SOCFPGA_FPGMGR_CTL_NCFGPULL 0x00000004
73
74#define CDRATIO_X1 0x00000000
75#define CDRATIO_X2 0x00000040
76#define CDRATIO_X4 0x00000080
77#define CDRATIO_X8 0x000000c0
78#define SOCFPGA_FPGMGR_CTL_CDRATIO_MASK 0x000000c0
79
80#define SOCFPGA_FPGMGR_CTL_AXICFGEN 0x00000100
81
82#define CFGWDTH_16 0x00000000
83#define CFGWDTH_32 0x00000200
84#define SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK 0x00000200
85
86/* SOCFPGA_FPGMGR_DCLKSTAT register */
87#define SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE 0x1
88
89/* SOCFPGA_FPGMGR_GPIO_* registers share the same bit positions */
90#define SOCFPGA_FPGMGR_MON_NSTATUS 0x0001
91#define SOCFPGA_FPGMGR_MON_CONF_DONE 0x0002
92#define SOCFPGA_FPGMGR_MON_INIT_DONE 0x0004
93#define SOCFPGA_FPGMGR_MON_CRC_ERROR 0x0008
94#define SOCFPGA_FPGMGR_MON_CVP_CONF_DONE 0x0010
95#define SOCFPGA_FPGMGR_MON_PR_READY 0x0020
96#define SOCFPGA_FPGMGR_MON_PR_ERROR 0x0040
97#define SOCFPGA_FPGMGR_MON_PR_DONE 0x0080
98#define SOCFPGA_FPGMGR_MON_NCONFIG_PIN 0x0100
99#define SOCFPGA_FPGMGR_MON_NSTATUS_PIN 0x0200
100#define SOCFPGA_FPGMGR_MON_CONF_DONE_PIN 0x0400
101#define SOCFPGA_FPGMGR_MON_FPGA_POWER_ON 0x0800
102#define SOCFPGA_FPGMGR_MON_STATUS_MASK 0x0fff
103
104#define SOCFPGA_FPGMGR_NUM_SUPPLIES 3
105#define SOCFPGA_RESUME_TIMEOUT 3
106
107/* In power-up order. Reverse for power-down. */
108static const char *supply_names[SOCFPGA_FPGMGR_NUM_SUPPLIES] __maybe_unused = {
109 "FPGA-1.5V",
110 "FPGA-1.1V",
111 "FPGA-2.5V",
112};
113
114struct socfpga_fpga_priv {
115 void __iomem *fpga_base_addr;
116 void __iomem *fpga_data_addr;
117 struct completion status_complete;
118 int irq;
119};
120
121struct cfgmgr_mode {
122 /* Values to set in the CTRL register */
123 u32 ctrl;
124
125 /* flag that this table entry is a valid mode */
126 bool valid;
127};
128
129/* For SOCFPGA_FPGMGR_STAT_MSEL field */
130static struct cfgmgr_mode cfgmgr_modes[] = {
131 [MSEL_PP16_FAST_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
132 [MSEL_PP16_FAST_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 },
133 [MSEL_PP16_FAST_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 },
134 [MSEL_PP16_SLOW_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
135 [MSEL_PP16_SLOW_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 },
136 [MSEL_PP16_SLOW_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 },
137 [MSEL_PP32_FAST_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
138 [MSEL_PP32_FAST_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 },
139 [MSEL_PP32_FAST_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 },
140 [MSEL_PP32_SLOW_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
141 [MSEL_PP32_SLOW_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 },
142 [MSEL_PP32_SLOW_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 },
143};
144
145static u32 socfpga_fpga_readl(struct socfpga_fpga_priv *priv, u32 reg_offset)
146{
147 return readl(priv->fpga_base_addr + reg_offset);
148}
149
150static void socfpga_fpga_writel(struct socfpga_fpga_priv *priv, u32 reg_offset,
151 u32 value)
152{
153 writel(value, priv->fpga_base_addr + reg_offset);
154}
155
156static u32 socfpga_fpga_raw_readl(struct socfpga_fpga_priv *priv,
157 u32 reg_offset)
158{
159 return __raw_readl(priv->fpga_base_addr + reg_offset);
160}
161
162static void socfpga_fpga_raw_writel(struct socfpga_fpga_priv *priv,
163 u32 reg_offset, u32 value)
164{
165 __raw_writel(value, priv->fpga_base_addr + reg_offset);
166}
167
168static void socfpga_fpga_data_writel(struct socfpga_fpga_priv *priv, u32 value)
169{
170 writel(value, priv->fpga_data_addr);
171}
172
173static inline void socfpga_fpga_set_bitsl(struct socfpga_fpga_priv *priv,
174 u32 offset, u32 bits)
175{
176 u32 val;
177
178 val = socfpga_fpga_readl(priv, offset);
179 val |= bits;
180 socfpga_fpga_writel(priv, offset, val);
181}
182
183static inline void socfpga_fpga_clr_bitsl(struct socfpga_fpga_priv *priv,
184 u32 offset, u32 bits)
185{
186 u32 val;
187
188 val = socfpga_fpga_readl(priv, offset);
189 val &= ~bits;
190 socfpga_fpga_writel(priv, offset, val);
191}
192
193static u32 socfpga_fpga_mon_status_get(struct socfpga_fpga_priv *priv)
194{
195 return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST) &
196 SOCFPGA_FPGMGR_MON_STATUS_MASK;
197}
198
199static u32 socfpga_fpga_state_get(struct socfpga_fpga_priv *priv)
200{
201 u32 status = socfpga_fpga_mon_status_get(priv);
202
203 if ((status & SOCFPGA_FPGMGR_MON_FPGA_POWER_ON) == 0)
204 return SOCFPGA_FPGMGR_STAT_POWER_OFF;
205
206 return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST) &
207 SOCFPGA_FPGMGR_STAT_STATE_MASK;
208}
209
210static void socfpga_fpga_clear_done_status(struct socfpga_fpga_priv *priv)
211{
212 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST,
213 SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE);
214}
215
216/*
217 * Set the DCLKCNT, wait for DCLKSTAT to report the count completed, and clear
218 * the complete status.
219 */
220static int socfpga_fpga_dclk_set_and_wait_clear(struct socfpga_fpga_priv *priv,
221 u32 count)
222{
223 int timeout = 2;
224 u32 done;
225
226 /* Clear any existing DONE status. */
227 if (socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST))
228 socfpga_fpga_clear_done_status(priv);
229
230 /* Issue the DCLK count. */
231 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKCNT_OFST, count);
232
233 /* Poll DCLKSTAT to see if it completed in the timeout period. */
234 do {
235 done = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST);
236 if (done == SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE) {
237 socfpga_fpga_clear_done_status(priv);
238 return 0;
239 }
240 udelay(1);
241 } while (timeout--);
242
243 return -ETIMEDOUT;
244}
245
246static int socfpga_fpga_wait_for_state(struct socfpga_fpga_priv *priv,
247 u32 state)
248{
249 int timeout = 2;
250
251 /*
252 * HW doesn't support an interrupt for changes in state, so poll to see
253 * if it matches the requested state within the timeout period.
254 */
255 do {
256 if ((socfpga_fpga_state_get(priv) & state) != 0)
257 return 0;
258 msleep(20);
259 } while (timeout--);
260
261 return -ETIMEDOUT;
262}
263
264static void socfpga_fpga_enable_irqs(struct socfpga_fpga_priv *priv, u32 irqs)
265{
266 /* set irqs to level sensitive */
267 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST, 0);
268
269 /* set interrupt polarity */
270 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INT_POL_OFST, irqs);
271
272 /* clear irqs */
273 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);
274
275 /* unmask interrupts */
276 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTMSK_OFST, 0);
277
278 /* enable interrupts */
279 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, irqs);
280}
281
282static void socfpga_fpga_disable_irqs(struct socfpga_fpga_priv *priv)
283{
284 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
285}
286
287static irqreturn_t socfpga_fpga_isr(int irq, void *dev_id)
288{
289 struct socfpga_fpga_priv *priv = dev_id;
290 u32 irqs, st;
291 bool conf_done, nstatus;
292
293 /* clear irqs */
294 irqs = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST);
295
296 socfpga_fpga_raw_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);
297
298 st = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST);
299 conf_done = (st & SOCFPGA_FPGMGR_MON_CONF_DONE) != 0;
300 nstatus = (st & SOCFPGA_FPGMGR_MON_NSTATUS) != 0;
301
302 /* success */
303 if (conf_done && nstatus) {
304 /* disable irqs */
305 socfpga_fpga_raw_writel(priv,
306 SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
307 complete(&priv->status_complete);
308 }
309
310 return IRQ_HANDLED;
311}
312
313static int socfpga_fpga_wait_for_config_done(struct socfpga_fpga_priv *priv)
314{
315 int timeout, ret = 0;
316
317 socfpga_fpga_disable_irqs(priv);
318 init_completion(&priv->status_complete);
319 socfpga_fpga_enable_irqs(priv, SOCFPGA_FPGMGR_MON_CONF_DONE);
320
321 timeout = wait_for_completion_interruptible_timeout(
322 &priv->status_complete,
323 msecs_to_jiffies(10));
324 if (timeout == 0)
325 ret = -ETIMEDOUT;
326
327 socfpga_fpga_disable_irqs(priv);
328 return ret;
329}
330
331static int socfpga_fpga_cfg_mode_get(struct socfpga_fpga_priv *priv)
332{
333 u32 msel;
334
335 msel = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST);
336 msel &= SOCFPGA_FPGMGR_STAT_MSEL_MASK;
337 msel >>= SOCFPGA_FPGMGR_STAT_MSEL_SHIFT;
338
339 /* Check that this MSEL setting is supported */
340 if ((msel >= ARRAY_SIZE(cfgmgr_modes)) || !cfgmgr_modes[msel].valid)
341 return -EINVAL;
342
343 return msel;
344}
345
346static int socfpga_fpga_cfg_mode_set(struct socfpga_fpga_priv *priv)
347{
348 u32 ctrl_reg;
349 int mode;
350
351 /* get value from MSEL pins */
352 mode = socfpga_fpga_cfg_mode_get(priv);
353 if (mode < 0)
354 return mode;
355
356 /* Adjust CTRL for the CDRATIO */
357 ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
358 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CDRATIO_MASK;
359 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK;
360 ctrl_reg |= cfgmgr_modes[mode].ctrl;
361
362 /* Set NCE to 0. */
363 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCE;
364 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
365
366 return 0;
367}
368
369static int socfpga_fpga_reset(struct fpga_manager *mgr)
370{
371 struct socfpga_fpga_priv *priv = mgr->priv;
372 u32 ctrl_reg, status;
373 int ret;
374
375 /*
376 * Step 1:
377 * - Set CTRL.CFGWDTH, CTRL.CDRATIO to match cfg mode
378 * - Set CTRL.NCE to 0
379 */
380 ret = socfpga_fpga_cfg_mode_set(priv);
381 if (ret)
382 return ret;
383
384 /* Step 2: Set CTRL.EN to 1 */
385 socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
386 SOCFPGA_FPGMGR_CTL_EN);
387
388 /* Step 3: Set CTRL.NCONFIGPULL to 1 to put FPGA in reset */
389 ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
390 ctrl_reg |= SOCFPGA_FPGMGR_CTL_NCFGPULL;
391 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
392
393 /* Step 4: Wait for STATUS.MODE to report FPGA is in reset phase */
394 status = socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_RESET);
395
396 /* Step 5: Set CONTROL.NCONFIGPULL to 0 to release FPGA from reset */
397 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCFGPULL;
398 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
399
400 /* Timeout waiting for reset */
401 if (status)
402 return -ETIMEDOUT;
403
404 return 0;
405}
406
407/*
408 * Prepare the FPGA to receive the configuration data.
409 */
410static int socfpga_fpga_ops_configure_init(struct fpga_manager *mgr, u32 flags,
411 const char *buf, size_t count)
412{
413 struct socfpga_fpga_priv *priv = mgr->priv;
414 int ret;
415
416 if (flags & FPGA_MGR_PARTIAL_RECONFIG) {
417 dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
418 return -EINVAL;
419 }
420 /* Steps 1 - 5: Reset the FPGA */
421 ret = socfpga_fpga_reset(mgr);
422 if (ret)
423 return ret;
424
425 /* Step 6: Wait for FPGA to enter configuration phase */
426 if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_CFG))
427 return -ETIMEDOUT;
428
429 /* Step 7: Clear nSTATUS interrupt */
430 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST,
431 SOCFPGA_FPGMGR_MON_NSTATUS);
432
433 /* Step 8: Set CTRL.AXICFGEN to 1 to enable transfer of config data */
434 socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
435 SOCFPGA_FPGMGR_CTL_AXICFGEN);
436
437 return 0;
438}
439
440/*
441 * Step 9: write data to the FPGA data register
442 */
443static int socfpga_fpga_ops_configure_write(struct fpga_manager *mgr,
444 const char *buf, size_t count)
445{
446 struct socfpga_fpga_priv *priv = mgr->priv;
447 u32 *buffer_32 = (u32 *)buf;
448 size_t i = 0;
449
450 if (count <= 0)
451 return -EINVAL;
452
453 /* Write out the complete 32-bit chunks. */
454 while (count >= sizeof(u32)) {
455 socfpga_fpga_data_writel(priv, buffer_32[i++]);
456 count -= sizeof(u32);
457 }
458
459 /* Write out remaining non 32-bit chunks. */
460 switch (count) {
461 case 3:
462 socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x00ffffff);
463 break;
464 case 2:
465 socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x0000ffff);
466 break;
467 case 1:
468 socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x000000ff);
469 break;
470 case 0:
471 break;
472 default:
473 /* This will never happen. */
474 return -EFAULT;
475 }
476
477 return 0;
478}
479
480static int socfpga_fpga_ops_configure_complete(struct fpga_manager *mgr,
481 u32 flags)
482{
483 struct socfpga_fpga_priv *priv = mgr->priv;
484 u32 status;
485
486 /*
487 * Step 10:
488 * - Observe CONF_DONE and nSTATUS (active low)
489 * - if CONF_DONE = 1 and nSTATUS = 1, configuration was successful
490 * - if CONF_DONE = 0 and nSTATUS = 0, configuration failed
491 */
492 status = socfpga_fpga_wait_for_config_done(priv);
493 if (status)
494 return status;
495
496 /* Step 11: Clear CTRL.AXICFGEN to disable transfer of config data */
497 socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
498 SOCFPGA_FPGMGR_CTL_AXICFGEN);
499
500 /*
501 * Step 12:
502 * - Write 4 to DCLKCNT
503 * - Wait for STATUS.DCNTDONE = 1
504 * - Clear W1C bit in STATUS.DCNTDONE
505 */
506 if (socfpga_fpga_dclk_set_and_wait_clear(priv, 4))
507 return -ETIMEDOUT;
508
509 /* Step 13: Wait for STATUS.MODE to report USER MODE */
510 if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_USER_MODE))
511 return -ETIMEDOUT;
512
513 /* Step 14: Set CTRL.EN to 0 */
514 socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
515 SOCFPGA_FPGMGR_CTL_EN);
516
517 return 0;
518}
519
520/* Translate state register values to FPGA framework state */
521static const enum fpga_mgr_states socfpga_state_to_framework_state[] = {
522 [SOCFPGA_FPGMGR_STAT_POWER_OFF] = FPGA_MGR_STATE_POWER_OFF,
523 [SOCFPGA_FPGMGR_STAT_RESET] = FPGA_MGR_STATE_RESET,
524 [SOCFPGA_FPGMGR_STAT_CFG] = FPGA_MGR_STATE_WRITE_INIT,
525 [SOCFPGA_FPGMGR_STAT_INIT] = FPGA_MGR_STATE_WRITE_INIT,
526 [SOCFPGA_FPGMGR_STAT_USER_MODE] = FPGA_MGR_STATE_OPERATING,
527 [SOCFPGA_FPGMGR_STAT_UNKNOWN] = FPGA_MGR_STATE_UNKNOWN,
528};
529
530static enum fpga_mgr_states socfpga_fpga_ops_state(struct fpga_manager *mgr)
531{
532 struct socfpga_fpga_priv *priv = mgr->priv;
533 enum fpga_mgr_states ret;
534 u32 state;
535
536 state = socfpga_fpga_state_get(priv);
537
538 if (state < ARRAY_SIZE(socfpga_state_to_framework_state))
539 ret = socfpga_state_to_framework_state[state];
540 else
541 ret = FPGA_MGR_STATE_UNKNOWN;
542
543 return ret;
544}
545
546static const struct fpga_manager_ops socfpga_fpga_ops = {
547 .state = socfpga_fpga_ops_state,
548 .write_init = socfpga_fpga_ops_configure_init,
549 .write = socfpga_fpga_ops_configure_write,
550 .write_complete = socfpga_fpga_ops_configure_complete,
551};
552
553static int socfpga_fpga_probe(struct platform_device *pdev)
554{
555 struct device *dev = &pdev->dev;
556 struct socfpga_fpga_priv *priv;
557 struct resource *res;
558 int ret;
559
560 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
561 if (!priv)
562 return -ENOMEM;
563
564 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
565 priv->fpga_base_addr = devm_ioremap_resource(dev, res);
566 if (IS_ERR(priv->fpga_base_addr))
567 return PTR_ERR(priv->fpga_base_addr);
568
569 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
570 priv->fpga_data_addr = devm_ioremap_resource(dev, res);
571 if (IS_ERR(priv->fpga_data_addr))
572 return PTR_ERR(priv->fpga_data_addr);
573
574 priv->irq = platform_get_irq(pdev, 0);
575 if (priv->irq < 0)
576 return priv->irq;
577
578 ret = devm_request_irq(dev, priv->irq, socfpga_fpga_isr, 0,
579 dev_name(dev), priv);
580 if (ret)
581 return ret;
582
583 return fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager",
584 &socfpga_fpga_ops, priv);
585}
586
587static int socfpga_fpga_remove(struct platform_device *pdev)
588{
589 fpga_mgr_unregister(&pdev->dev);
590
591 return 0;
592}
593
594#ifdef CONFIG_OF
595static const struct of_device_id socfpga_fpga_of_match[] = {
596 { .compatible = "altr,socfpga-fpga-mgr", },
597 {},
598};
599
600MODULE_DEVICE_TABLE(of, socfpga_fpga_of_match);
601#endif
602
603static struct platform_driver socfpga_fpga_driver = {
604 .probe = socfpga_fpga_probe,
605 .remove = socfpga_fpga_remove,
606 .driver = {
607 .name = "socfpga_fpga_manager",
608 .of_match_table = of_match_ptr(socfpga_fpga_of_match),
609 },
610};
611
612module_platform_driver(socfpga_fpga_driver);
613
614MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
615MODULE_DESCRIPTION("Altera SOCFPGA FPGA Manager");
616MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * FPGA Manager Driver for Altera SOCFPGA
4 *
5 * Copyright (C) 2013-2015 Altera Corporation
6 */
7#include <linux/completion.h>
8#include <linux/delay.h>
9#include <linux/fpga/fpga-mgr.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/of_address.h>
14#include <linux/of_irq.h>
15#include <linux/pm.h>
16
17/* Register offsets */
18#define SOCFPGA_FPGMGR_STAT_OFST 0x0
19#define SOCFPGA_FPGMGR_CTL_OFST 0x4
20#define SOCFPGA_FPGMGR_DCLKCNT_OFST 0x8
21#define SOCFPGA_FPGMGR_DCLKSTAT_OFST 0xc
22#define SOCFPGA_FPGMGR_GPIO_INTEN_OFST 0x830
23#define SOCFPGA_FPGMGR_GPIO_INTMSK_OFST 0x834
24#define SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST 0x838
25#define SOCFPGA_FPGMGR_GPIO_INT_POL_OFST 0x83c
26#define SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST 0x840
27#define SOCFPGA_FPGMGR_GPIO_RAW_INTSTAT_OFST 0x844
28#define SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST 0x84c
29#define SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST 0x850
30
31/* Register bit defines */
32/* SOCFPGA_FPGMGR_STAT register mode field values */
33#define SOCFPGA_FPGMGR_STAT_POWER_UP 0x0 /*ramping*/
34#define SOCFPGA_FPGMGR_STAT_RESET 0x1
35#define SOCFPGA_FPGMGR_STAT_CFG 0x2
36#define SOCFPGA_FPGMGR_STAT_INIT 0x3
37#define SOCFPGA_FPGMGR_STAT_USER_MODE 0x4
38#define SOCFPGA_FPGMGR_STAT_UNKNOWN 0x5
39#define SOCFPGA_FPGMGR_STAT_STATE_MASK 0x7
40/* This is a flag value that doesn't really happen in this register field */
41#define SOCFPGA_FPGMGR_STAT_POWER_OFF 0x0
42
43#define MSEL_PP16_FAST_NOAES_NODC 0x0
44#define MSEL_PP16_FAST_AES_NODC 0x1
45#define MSEL_PP16_FAST_AESOPT_DC 0x2
46#define MSEL_PP16_SLOW_NOAES_NODC 0x4
47#define MSEL_PP16_SLOW_AES_NODC 0x5
48#define MSEL_PP16_SLOW_AESOPT_DC 0x6
49#define MSEL_PP32_FAST_NOAES_NODC 0x8
50#define MSEL_PP32_FAST_AES_NODC 0x9
51#define MSEL_PP32_FAST_AESOPT_DC 0xa
52#define MSEL_PP32_SLOW_NOAES_NODC 0xc
53#define MSEL_PP32_SLOW_AES_NODC 0xd
54#define MSEL_PP32_SLOW_AESOPT_DC 0xe
55#define SOCFPGA_FPGMGR_STAT_MSEL_MASK 0x000000f8
56#define SOCFPGA_FPGMGR_STAT_MSEL_SHIFT 3
57
58/* SOCFPGA_FPGMGR_CTL register */
59#define SOCFPGA_FPGMGR_CTL_EN 0x00000001
60#define SOCFPGA_FPGMGR_CTL_NCE 0x00000002
61#define SOCFPGA_FPGMGR_CTL_NCFGPULL 0x00000004
62
63#define CDRATIO_X1 0x00000000
64#define CDRATIO_X2 0x00000040
65#define CDRATIO_X4 0x00000080
66#define CDRATIO_X8 0x000000c0
67#define SOCFPGA_FPGMGR_CTL_CDRATIO_MASK 0x000000c0
68
69#define SOCFPGA_FPGMGR_CTL_AXICFGEN 0x00000100
70
71#define CFGWDTH_16 0x00000000
72#define CFGWDTH_32 0x00000200
73#define SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK 0x00000200
74
75/* SOCFPGA_FPGMGR_DCLKSTAT register */
76#define SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE 0x1
77
78/* SOCFPGA_FPGMGR_GPIO_* registers share the same bit positions */
79#define SOCFPGA_FPGMGR_MON_NSTATUS 0x0001
80#define SOCFPGA_FPGMGR_MON_CONF_DONE 0x0002
81#define SOCFPGA_FPGMGR_MON_INIT_DONE 0x0004
82#define SOCFPGA_FPGMGR_MON_CRC_ERROR 0x0008
83#define SOCFPGA_FPGMGR_MON_CVP_CONF_DONE 0x0010
84#define SOCFPGA_FPGMGR_MON_PR_READY 0x0020
85#define SOCFPGA_FPGMGR_MON_PR_ERROR 0x0040
86#define SOCFPGA_FPGMGR_MON_PR_DONE 0x0080
87#define SOCFPGA_FPGMGR_MON_NCONFIG_PIN 0x0100
88#define SOCFPGA_FPGMGR_MON_NSTATUS_PIN 0x0200
89#define SOCFPGA_FPGMGR_MON_CONF_DONE_PIN 0x0400
90#define SOCFPGA_FPGMGR_MON_FPGA_POWER_ON 0x0800
91#define SOCFPGA_FPGMGR_MON_STATUS_MASK 0x0fff
92
93#define SOCFPGA_FPGMGR_NUM_SUPPLIES 3
94#define SOCFPGA_RESUME_TIMEOUT 3
95
96/* In power-up order. Reverse for power-down. */
97static const char *supply_names[SOCFPGA_FPGMGR_NUM_SUPPLIES] __maybe_unused = {
98 "FPGA-1.5V",
99 "FPGA-1.1V",
100 "FPGA-2.5V",
101};
102
103struct socfpga_fpga_priv {
104 void __iomem *fpga_base_addr;
105 void __iomem *fpga_data_addr;
106 struct completion status_complete;
107 int irq;
108};
109
110struct cfgmgr_mode {
111 /* Values to set in the CTRL register */
112 u32 ctrl;
113
114 /* flag that this table entry is a valid mode */
115 bool valid;
116};
117
118/* For SOCFPGA_FPGMGR_STAT_MSEL field */
119static struct cfgmgr_mode cfgmgr_modes[] = {
120 [MSEL_PP16_FAST_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
121 [MSEL_PP16_FAST_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 },
122 [MSEL_PP16_FAST_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 },
123 [MSEL_PP16_SLOW_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
124 [MSEL_PP16_SLOW_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 },
125 [MSEL_PP16_SLOW_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 },
126 [MSEL_PP32_FAST_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
127 [MSEL_PP32_FAST_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 },
128 [MSEL_PP32_FAST_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 },
129 [MSEL_PP32_SLOW_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
130 [MSEL_PP32_SLOW_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 },
131 [MSEL_PP32_SLOW_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 },
132};
133
134static u32 socfpga_fpga_readl(struct socfpga_fpga_priv *priv, u32 reg_offset)
135{
136 return readl(priv->fpga_base_addr + reg_offset);
137}
138
139static void socfpga_fpga_writel(struct socfpga_fpga_priv *priv, u32 reg_offset,
140 u32 value)
141{
142 writel(value, priv->fpga_base_addr + reg_offset);
143}
144
145static u32 socfpga_fpga_raw_readl(struct socfpga_fpga_priv *priv,
146 u32 reg_offset)
147{
148 return __raw_readl(priv->fpga_base_addr + reg_offset);
149}
150
151static void socfpga_fpga_raw_writel(struct socfpga_fpga_priv *priv,
152 u32 reg_offset, u32 value)
153{
154 __raw_writel(value, priv->fpga_base_addr + reg_offset);
155}
156
157static void socfpga_fpga_data_writel(struct socfpga_fpga_priv *priv, u32 value)
158{
159 writel(value, priv->fpga_data_addr);
160}
161
162static inline void socfpga_fpga_set_bitsl(struct socfpga_fpga_priv *priv,
163 u32 offset, u32 bits)
164{
165 u32 val;
166
167 val = socfpga_fpga_readl(priv, offset);
168 val |= bits;
169 socfpga_fpga_writel(priv, offset, val);
170}
171
172static inline void socfpga_fpga_clr_bitsl(struct socfpga_fpga_priv *priv,
173 u32 offset, u32 bits)
174{
175 u32 val;
176
177 val = socfpga_fpga_readl(priv, offset);
178 val &= ~bits;
179 socfpga_fpga_writel(priv, offset, val);
180}
181
182static u32 socfpga_fpga_mon_status_get(struct socfpga_fpga_priv *priv)
183{
184 return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST) &
185 SOCFPGA_FPGMGR_MON_STATUS_MASK;
186}
187
188static u32 socfpga_fpga_state_get(struct socfpga_fpga_priv *priv)
189{
190 u32 status = socfpga_fpga_mon_status_get(priv);
191
192 if ((status & SOCFPGA_FPGMGR_MON_FPGA_POWER_ON) == 0)
193 return SOCFPGA_FPGMGR_STAT_POWER_OFF;
194
195 return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST) &
196 SOCFPGA_FPGMGR_STAT_STATE_MASK;
197}
198
199static void socfpga_fpga_clear_done_status(struct socfpga_fpga_priv *priv)
200{
201 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST,
202 SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE);
203}
204
205/*
206 * Set the DCLKCNT, wait for DCLKSTAT to report the count completed, and clear
207 * the complete status.
208 */
209static int socfpga_fpga_dclk_set_and_wait_clear(struct socfpga_fpga_priv *priv,
210 u32 count)
211{
212 int timeout = 2;
213 u32 done;
214
215 /* Clear any existing DONE status. */
216 if (socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST))
217 socfpga_fpga_clear_done_status(priv);
218
219 /* Issue the DCLK count. */
220 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKCNT_OFST, count);
221
222 /* Poll DCLKSTAT to see if it completed in the timeout period. */
223 do {
224 done = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST);
225 if (done == SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE) {
226 socfpga_fpga_clear_done_status(priv);
227 return 0;
228 }
229 udelay(1);
230 } while (timeout--);
231
232 return -ETIMEDOUT;
233}
234
235static int socfpga_fpga_wait_for_state(struct socfpga_fpga_priv *priv,
236 u32 state)
237{
238 int timeout = 2;
239
240 /*
241 * HW doesn't support an interrupt for changes in state, so poll to see
242 * if it matches the requested state within the timeout period.
243 */
244 do {
245 if ((socfpga_fpga_state_get(priv) & state) != 0)
246 return 0;
247 msleep(20);
248 } while (timeout--);
249
250 return -ETIMEDOUT;
251}
252
253static void socfpga_fpga_enable_irqs(struct socfpga_fpga_priv *priv, u32 irqs)
254{
255 /* set irqs to level sensitive */
256 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST, 0);
257
258 /* set interrupt polarity */
259 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INT_POL_OFST, irqs);
260
261 /* clear irqs */
262 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);
263
264 /* unmask interrupts */
265 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTMSK_OFST, 0);
266
267 /* enable interrupts */
268 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, irqs);
269}
270
271static void socfpga_fpga_disable_irqs(struct socfpga_fpga_priv *priv)
272{
273 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
274}
275
276static irqreturn_t socfpga_fpga_isr(int irq, void *dev_id)
277{
278 struct socfpga_fpga_priv *priv = dev_id;
279 u32 irqs, st;
280 bool conf_done, nstatus;
281
282 /* clear irqs */
283 irqs = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST);
284
285 socfpga_fpga_raw_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);
286
287 st = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST);
288 conf_done = (st & SOCFPGA_FPGMGR_MON_CONF_DONE) != 0;
289 nstatus = (st & SOCFPGA_FPGMGR_MON_NSTATUS) != 0;
290
291 /* success */
292 if (conf_done && nstatus) {
293 /* disable irqs */
294 socfpga_fpga_raw_writel(priv,
295 SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
296 complete(&priv->status_complete);
297 }
298
299 return IRQ_HANDLED;
300}
301
302static int socfpga_fpga_wait_for_config_done(struct socfpga_fpga_priv *priv)
303{
304 int ret = 0;
305 long time_left;
306
307 socfpga_fpga_disable_irqs(priv);
308 init_completion(&priv->status_complete);
309 socfpga_fpga_enable_irqs(priv, SOCFPGA_FPGMGR_MON_CONF_DONE);
310
311 time_left = wait_for_completion_interruptible_timeout(
312 &priv->status_complete,
313 msecs_to_jiffies(10));
314 if (time_left == 0)
315 ret = -ETIMEDOUT;
316
317 socfpga_fpga_disable_irqs(priv);
318 return ret;
319}
320
321static int socfpga_fpga_cfg_mode_get(struct socfpga_fpga_priv *priv)
322{
323 u32 msel;
324
325 msel = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST);
326 msel &= SOCFPGA_FPGMGR_STAT_MSEL_MASK;
327 msel >>= SOCFPGA_FPGMGR_STAT_MSEL_SHIFT;
328
329 /* Check that this MSEL setting is supported */
330 if ((msel >= ARRAY_SIZE(cfgmgr_modes)) || !cfgmgr_modes[msel].valid)
331 return -EINVAL;
332
333 return msel;
334}
335
336static int socfpga_fpga_cfg_mode_set(struct socfpga_fpga_priv *priv)
337{
338 u32 ctrl_reg;
339 int mode;
340
341 /* get value from MSEL pins */
342 mode = socfpga_fpga_cfg_mode_get(priv);
343 if (mode < 0)
344 return mode;
345
346 /* Adjust CTRL for the CDRATIO */
347 ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
348 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CDRATIO_MASK;
349 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK;
350 ctrl_reg |= cfgmgr_modes[mode].ctrl;
351
352 /* Set NCE to 0. */
353 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCE;
354 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
355
356 return 0;
357}
358
359static int socfpga_fpga_reset(struct fpga_manager *mgr)
360{
361 struct socfpga_fpga_priv *priv = mgr->priv;
362 u32 ctrl_reg, status;
363 int ret;
364
365 /*
366 * Step 1:
367 * - Set CTRL.CFGWDTH, CTRL.CDRATIO to match cfg mode
368 * - Set CTRL.NCE to 0
369 */
370 ret = socfpga_fpga_cfg_mode_set(priv);
371 if (ret)
372 return ret;
373
374 /* Step 2: Set CTRL.EN to 1 */
375 socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
376 SOCFPGA_FPGMGR_CTL_EN);
377
378 /* Step 3: Set CTRL.NCONFIGPULL to 1 to put FPGA in reset */
379 ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
380 ctrl_reg |= SOCFPGA_FPGMGR_CTL_NCFGPULL;
381 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
382
383 /* Step 4: Wait for STATUS.MODE to report FPGA is in reset phase */
384 status = socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_RESET);
385
386 /* Step 5: Set CONTROL.NCONFIGPULL to 0 to release FPGA from reset */
387 ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCFGPULL;
388 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
389
390 /* Timeout waiting for reset */
391 if (status)
392 return -ETIMEDOUT;
393
394 return 0;
395}
396
397/*
398 * Prepare the FPGA to receive the configuration data.
399 */
400static int socfpga_fpga_ops_configure_init(struct fpga_manager *mgr,
401 struct fpga_image_info *info,
402 const char *buf, size_t count)
403{
404 struct socfpga_fpga_priv *priv = mgr->priv;
405 int ret;
406
407 if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
408 dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
409 return -EINVAL;
410 }
411 /* Steps 1 - 5: Reset the FPGA */
412 ret = socfpga_fpga_reset(mgr);
413 if (ret)
414 return ret;
415
416 /* Step 6: Wait for FPGA to enter configuration phase */
417 if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_CFG))
418 return -ETIMEDOUT;
419
420 /* Step 7: Clear nSTATUS interrupt */
421 socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST,
422 SOCFPGA_FPGMGR_MON_NSTATUS);
423
424 /* Step 8: Set CTRL.AXICFGEN to 1 to enable transfer of config data */
425 socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
426 SOCFPGA_FPGMGR_CTL_AXICFGEN);
427
428 return 0;
429}
430
431/*
432 * Step 9: write data to the FPGA data register
433 */
434static int socfpga_fpga_ops_configure_write(struct fpga_manager *mgr,
435 const char *buf, size_t count)
436{
437 struct socfpga_fpga_priv *priv = mgr->priv;
438 u32 *buffer_32 = (u32 *)buf;
439 size_t i = 0;
440
441 if (count <= 0)
442 return -EINVAL;
443
444 /* Write out the complete 32-bit chunks. */
445 while (count >= sizeof(u32)) {
446 socfpga_fpga_data_writel(priv, buffer_32[i++]);
447 count -= sizeof(u32);
448 }
449
450 /* Write out remaining non 32-bit chunks. */
451 switch (count) {
452 case 3:
453 socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x00ffffff);
454 break;
455 case 2:
456 socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x0000ffff);
457 break;
458 case 1:
459 socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x000000ff);
460 break;
461 case 0:
462 break;
463 default:
464 /* This will never happen. */
465 return -EFAULT;
466 }
467
468 return 0;
469}
470
471static int socfpga_fpga_ops_configure_complete(struct fpga_manager *mgr,
472 struct fpga_image_info *info)
473{
474 struct socfpga_fpga_priv *priv = mgr->priv;
475 u32 status;
476
477 /*
478 * Step 10:
479 * - Observe CONF_DONE and nSTATUS (active low)
480 * - if CONF_DONE = 1 and nSTATUS = 1, configuration was successful
481 * - if CONF_DONE = 0 and nSTATUS = 0, configuration failed
482 */
483 status = socfpga_fpga_wait_for_config_done(priv);
484 if (status)
485 return status;
486
487 /* Step 11: Clear CTRL.AXICFGEN to disable transfer of config data */
488 socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
489 SOCFPGA_FPGMGR_CTL_AXICFGEN);
490
491 /*
492 * Step 12:
493 * - Write 4 to DCLKCNT
494 * - Wait for STATUS.DCNTDONE = 1
495 * - Clear W1C bit in STATUS.DCNTDONE
496 */
497 if (socfpga_fpga_dclk_set_and_wait_clear(priv, 4))
498 return -ETIMEDOUT;
499
500 /* Step 13: Wait for STATUS.MODE to report USER MODE */
501 if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_USER_MODE))
502 return -ETIMEDOUT;
503
504 /* Step 14: Set CTRL.EN to 0 */
505 socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
506 SOCFPGA_FPGMGR_CTL_EN);
507
508 return 0;
509}
510
511/* Translate state register values to FPGA framework state */
512static const enum fpga_mgr_states socfpga_state_to_framework_state[] = {
513 [SOCFPGA_FPGMGR_STAT_POWER_OFF] = FPGA_MGR_STATE_POWER_OFF,
514 [SOCFPGA_FPGMGR_STAT_RESET] = FPGA_MGR_STATE_RESET,
515 [SOCFPGA_FPGMGR_STAT_CFG] = FPGA_MGR_STATE_WRITE_INIT,
516 [SOCFPGA_FPGMGR_STAT_INIT] = FPGA_MGR_STATE_WRITE_INIT,
517 [SOCFPGA_FPGMGR_STAT_USER_MODE] = FPGA_MGR_STATE_OPERATING,
518 [SOCFPGA_FPGMGR_STAT_UNKNOWN] = FPGA_MGR_STATE_UNKNOWN,
519};
520
521static enum fpga_mgr_states socfpga_fpga_ops_state(struct fpga_manager *mgr)
522{
523 struct socfpga_fpga_priv *priv = mgr->priv;
524 enum fpga_mgr_states ret;
525 u32 state;
526
527 state = socfpga_fpga_state_get(priv);
528
529 if (state < ARRAY_SIZE(socfpga_state_to_framework_state))
530 ret = socfpga_state_to_framework_state[state];
531 else
532 ret = FPGA_MGR_STATE_UNKNOWN;
533
534 return ret;
535}
536
537static const struct fpga_manager_ops socfpga_fpga_ops = {
538 .state = socfpga_fpga_ops_state,
539 .write_init = socfpga_fpga_ops_configure_init,
540 .write = socfpga_fpga_ops_configure_write,
541 .write_complete = socfpga_fpga_ops_configure_complete,
542};
543
544static int socfpga_fpga_probe(struct platform_device *pdev)
545{
546 struct device *dev = &pdev->dev;
547 struct socfpga_fpga_priv *priv;
548 struct fpga_manager *mgr;
549 int ret;
550
551 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
552 if (!priv)
553 return -ENOMEM;
554
555 priv->fpga_base_addr = devm_platform_ioremap_resource(pdev, 0);
556 if (IS_ERR(priv->fpga_base_addr))
557 return PTR_ERR(priv->fpga_base_addr);
558
559 priv->fpga_data_addr = devm_platform_ioremap_resource(pdev, 1);
560 if (IS_ERR(priv->fpga_data_addr))
561 return PTR_ERR(priv->fpga_data_addr);
562
563 priv->irq = platform_get_irq(pdev, 0);
564 if (priv->irq < 0)
565 return priv->irq;
566
567 ret = devm_request_irq(dev, priv->irq, socfpga_fpga_isr, 0,
568 dev_name(dev), priv);
569 if (ret)
570 return ret;
571
572 mgr = devm_fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager",
573 &socfpga_fpga_ops, priv);
574 return PTR_ERR_OR_ZERO(mgr);
575}
576
577#ifdef CONFIG_OF
578static const struct of_device_id socfpga_fpga_of_match[] = {
579 { .compatible = "altr,socfpga-fpga-mgr", },
580 {},
581};
582
583MODULE_DEVICE_TABLE(of, socfpga_fpga_of_match);
584#endif
585
586static struct platform_driver socfpga_fpga_driver = {
587 .probe = socfpga_fpga_probe,
588 .driver = {
589 .name = "socfpga_fpga_manager",
590 .of_match_table = of_match_ptr(socfpga_fpga_of_match),
591 },
592};
593
594module_platform_driver(socfpga_fpga_driver);
595
596MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
597MODULE_DESCRIPTION("Altera SOCFPGA FPGA Manager");
598MODULE_LICENSE("GPL v2");