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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next...
[deliverable/linux.git] / drivers / spmi / spmi-pmic-arb.c
1 /*
2 * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13 #include <linux/delay.h>
14 #include <linux/err.h>
15 #include <linux/interrupt.h>
16 #include <linux/io.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/irqdomain.h>
19 #include <linux/irq.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/platform_device.h>
24 #include <linux/slab.h>
25 #include <linux/spmi.h>
26
27 /* PMIC Arbiter configuration registers */
28 #define PMIC_ARB_VERSION 0x0000
29 #define PMIC_ARB_VERSION_V2_MIN 0x20010000
30 #define PMIC_ARB_INT_EN 0x0004
31
32 /* PMIC Arbiter channel registers offsets */
33 #define PMIC_ARB_CMD 0x00
34 #define PMIC_ARB_CONFIG 0x04
35 #define PMIC_ARB_STATUS 0x08
36 #define PMIC_ARB_WDATA0 0x10
37 #define PMIC_ARB_WDATA1 0x14
38 #define PMIC_ARB_RDATA0 0x18
39 #define PMIC_ARB_RDATA1 0x1C
40 #define PMIC_ARB_REG_CHNL(N) (0x800 + 0x4 * (N))
41
42 /* Mapping Table */
43 #define SPMI_MAPPING_TABLE_REG(N) (0x0B00 + (4 * (N)))
44 #define SPMI_MAPPING_BIT_INDEX(X) (((X) >> 18) & 0xF)
45 #define SPMI_MAPPING_BIT_IS_0_FLAG(X) (((X) >> 17) & 0x1)
46 #define SPMI_MAPPING_BIT_IS_0_RESULT(X) (((X) >> 9) & 0xFF)
47 #define SPMI_MAPPING_BIT_IS_1_FLAG(X) (((X) >> 8) & 0x1)
48 #define SPMI_MAPPING_BIT_IS_1_RESULT(X) (((X) >> 0) & 0xFF)
49
50 #define SPMI_MAPPING_TABLE_LEN 255
51 #define SPMI_MAPPING_TABLE_TREE_DEPTH 16 /* Maximum of 16-bits */
52 #define PPID_TO_CHAN_TABLE_SZ BIT(12) /* PPID is 12bit chan is 1byte*/
53
54 /* Ownership Table */
55 #define SPMI_OWNERSHIP_TABLE_REG(N) (0x0700 + (4 * (N)))
56 #define SPMI_OWNERSHIP_PERIPH2OWNER(X) ((X) & 0x7)
57
58 /* Channel Status fields */
59 enum pmic_arb_chnl_status {
60 PMIC_ARB_STATUS_DONE = (1 << 0),
61 PMIC_ARB_STATUS_FAILURE = (1 << 1),
62 PMIC_ARB_STATUS_DENIED = (1 << 2),
63 PMIC_ARB_STATUS_DROPPED = (1 << 3),
64 };
65
66 /* Command register fields */
67 #define PMIC_ARB_CMD_MAX_BYTE_COUNT 8
68
69 /* Command Opcodes */
70 enum pmic_arb_cmd_op_code {
71 PMIC_ARB_OP_EXT_WRITEL = 0,
72 PMIC_ARB_OP_EXT_READL = 1,
73 PMIC_ARB_OP_EXT_WRITE = 2,
74 PMIC_ARB_OP_RESET = 3,
75 PMIC_ARB_OP_SLEEP = 4,
76 PMIC_ARB_OP_SHUTDOWN = 5,
77 PMIC_ARB_OP_WAKEUP = 6,
78 PMIC_ARB_OP_AUTHENTICATE = 7,
79 PMIC_ARB_OP_MSTR_READ = 8,
80 PMIC_ARB_OP_MSTR_WRITE = 9,
81 PMIC_ARB_OP_EXT_READ = 13,
82 PMIC_ARB_OP_WRITE = 14,
83 PMIC_ARB_OP_READ = 15,
84 PMIC_ARB_OP_ZERO_WRITE = 16,
85 };
86
87 /* Maximum number of support PMIC peripherals */
88 #define PMIC_ARB_MAX_PERIPHS 256
89 #define PMIC_ARB_MAX_CHNL 128
90 #define PMIC_ARB_PERIPH_ID_VALID (1 << 15)
91 #define PMIC_ARB_TIMEOUT_US 100
92 #define PMIC_ARB_MAX_TRANS_BYTES (8)
93
94 #define PMIC_ARB_APID_MASK 0xFF
95 #define PMIC_ARB_PPID_MASK 0xFFF
96
97 /* interrupt enable bit */
98 #define SPMI_PIC_ACC_ENABLE_BIT BIT(0)
99
100 struct pmic_arb_ver_ops;
101
102 /**
103 * spmi_pmic_arb_dev - SPMI PMIC Arbiter object
104 *
105 * @rd_base: on v1 "core", on v2 "observer" register base off DT.
106 * @wr_base: on v1 "core", on v2 "chnls" register base off DT.
107 * @intr: address of the SPMI interrupt control registers.
108 * @cnfg: address of the PMIC Arbiter configuration registers.
109 * @lock: lock to synchronize accesses.
110 * @channel: execution environment channel to use for accesses.
111 * @irq: PMIC ARB interrupt.
112 * @ee: the current Execution Environment
113 * @min_apid: minimum APID (used for bounding IRQ search)
114 * @max_apid: maximum APID
115 * @mapping_table: in-memory copy of PPID -> APID mapping table.
116 * @domain: irq domain object for PMIC IRQ domain
117 * @spmic: SPMI controller object
118 * @apid_to_ppid: in-memory copy of APID -> PPID mapping table.
119 * @ver_ops: version dependent operations.
120 * @ppid_to_chan in-memory copy of PPID -> channel (APID) mapping table.
121 * v2 only.
122 */
123 struct spmi_pmic_arb_dev {
124 void __iomem *rd_base;
125 void __iomem *wr_base;
126 void __iomem *intr;
127 void __iomem *cnfg;
128 raw_spinlock_t lock;
129 u8 channel;
130 int irq;
131 u8 ee;
132 u8 min_apid;
133 u8 max_apid;
134 u32 mapping_table[SPMI_MAPPING_TABLE_LEN];
135 struct irq_domain *domain;
136 struct spmi_controller *spmic;
137 u16 apid_to_ppid[256];
138 const struct pmic_arb_ver_ops *ver_ops;
139 u8 *ppid_to_chan;
140 };
141
142 /**
143 * pmic_arb_ver: version dependent functionality.
144 *
145 * @non_data_cmd: on v1 issues an spmi non-data command.
146 * on v2 no HW support, returns -EOPNOTSUPP.
147 * @offset: on v1 offset of per-ee channel.
148 * on v2 offset of per-ee and per-ppid channel.
149 * @fmt_cmd: formats a GENI/SPMI command.
150 * @owner_acc_status: on v1 offset of PMIC_ARB_SPMI_PIC_OWNERm_ACC_STATUSn
151 * on v2 offset of SPMI_PIC_OWNERm_ACC_STATUSn.
152 * @acc_enable: on v1 offset of PMIC_ARB_SPMI_PIC_ACC_ENABLEn
153 * on v2 offset of SPMI_PIC_ACC_ENABLEn.
154 * @irq_status: on v1 offset of PMIC_ARB_SPMI_PIC_IRQ_STATUSn
155 * on v2 offset of SPMI_PIC_IRQ_STATUSn.
156 * @irq_clear: on v1 offset of PMIC_ARB_SPMI_PIC_IRQ_CLEARn
157 * on v2 offset of SPMI_PIC_IRQ_CLEARn.
158 */
159 struct pmic_arb_ver_ops {
160 /* spmi commands (read_cmd, write_cmd, cmd) functionality */
161 u32 (*offset)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr);
162 u32 (*fmt_cmd)(u8 opc, u8 sid, u16 addr, u8 bc);
163 int (*non_data_cmd)(struct spmi_controller *ctrl, u8 opc, u8 sid);
164 /* Interrupts controller functionality (offset of PIC registers) */
165 u32 (*owner_acc_status)(u8 m, u8 n);
166 u32 (*acc_enable)(u8 n);
167 u32 (*irq_status)(u8 n);
168 u32 (*irq_clear)(u8 n);
169 };
170
171 static inline u32 pmic_arb_base_read(struct spmi_pmic_arb_dev *dev, u32 offset)
172 {
173 return readl_relaxed(dev->rd_base + offset);
174 }
175
176 static inline void pmic_arb_base_write(struct spmi_pmic_arb_dev *dev,
177 u32 offset, u32 val)
178 {
179 writel_relaxed(val, dev->wr_base + offset);
180 }
181
182 static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb_dev *dev,
183 u32 offset, u32 val)
184 {
185 writel_relaxed(val, dev->rd_base + offset);
186 }
187
188 /**
189 * pa_read_data: reads pmic-arb's register and copy 1..4 bytes to buf
190 * @bc: byte count -1. range: 0..3
191 * @reg: register's address
192 * @buf: output parameter, length must be bc + 1
193 */
194 static void pa_read_data(struct spmi_pmic_arb_dev *dev, u8 *buf, u32 reg, u8 bc)
195 {
196 u32 data = pmic_arb_base_read(dev, reg);
197 memcpy(buf, &data, (bc & 3) + 1);
198 }
199
200 /**
201 * pa_write_data: write 1..4 bytes from buf to pmic-arb's register
202 * @bc: byte-count -1. range: 0..3.
203 * @reg: register's address.
204 * @buf: buffer to write. length must be bc + 1.
205 */
206 static void
207 pa_write_data(struct spmi_pmic_arb_dev *dev, const u8 *buf, u32 reg, u8 bc)
208 {
209 u32 data = 0;
210 memcpy(&data, buf, (bc & 3) + 1);
211 pmic_arb_base_write(dev, reg, data);
212 }
213
214 static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
215 void __iomem *base, u8 sid, u16 addr)
216 {
217 struct spmi_pmic_arb_dev *dev = spmi_controller_get_drvdata(ctrl);
218 u32 status = 0;
219 u32 timeout = PMIC_ARB_TIMEOUT_US;
220 u32 offset = dev->ver_ops->offset(dev, sid, addr) + PMIC_ARB_STATUS;
221
222 while (timeout--) {
223 status = readl_relaxed(base + offset);
224
225 if (status & PMIC_ARB_STATUS_DONE) {
226 if (status & PMIC_ARB_STATUS_DENIED) {
227 dev_err(&ctrl->dev,
228 "%s: transaction denied (0x%x)\n",
229 __func__, status);
230 return -EPERM;
231 }
232
233 if (status & PMIC_ARB_STATUS_FAILURE) {
234 dev_err(&ctrl->dev,
235 "%s: transaction failed (0x%x)\n",
236 __func__, status);
237 return -EIO;
238 }
239
240 if (status & PMIC_ARB_STATUS_DROPPED) {
241 dev_err(&ctrl->dev,
242 "%s: transaction dropped (0x%x)\n",
243 __func__, status);
244 return -EIO;
245 }
246
247 return 0;
248 }
249 udelay(1);
250 }
251
252 dev_err(&ctrl->dev,
253 "%s: timeout, status 0x%x\n",
254 __func__, status);
255 return -ETIMEDOUT;
256 }
257
258 static int
259 pmic_arb_non_data_cmd_v1(struct spmi_controller *ctrl, u8 opc, u8 sid)
260 {
261 struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
262 unsigned long flags;
263 u32 cmd;
264 int rc;
265 u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, 0);
266
267 cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20);
268
269 raw_spin_lock_irqsave(&pmic_arb->lock, flags);
270 pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
271 rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0);
272 raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
273
274 return rc;
275 }
276
277 static int
278 pmic_arb_non_data_cmd_v2(struct spmi_controller *ctrl, u8 opc, u8 sid)
279 {
280 return -EOPNOTSUPP;
281 }
282
283 /* Non-data command */
284 static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
285 {
286 struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
287
288 dev_dbg(&ctrl->dev, "cmd op:0x%x sid:%d\n", opc, sid);
289
290 /* Check for valid non-data command */
291 if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP)
292 return -EINVAL;
293
294 return pmic_arb->ver_ops->non_data_cmd(ctrl, opc, sid);
295 }
296
297 static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
298 u16 addr, u8 *buf, size_t len)
299 {
300 struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
301 unsigned long flags;
302 u8 bc = len - 1;
303 u32 cmd;
304 int rc;
305 u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
306
307 if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
308 dev_err(&ctrl->dev,
309 "pmic-arb supports 1..%d bytes per trans, but:%zu requested",
310 PMIC_ARB_MAX_TRANS_BYTES, len);
311 return -EINVAL;
312 }
313
314 /* Check the opcode */
315 if (opc >= 0x60 && opc <= 0x7F)
316 opc = PMIC_ARB_OP_READ;
317 else if (opc >= 0x20 && opc <= 0x2F)
318 opc = PMIC_ARB_OP_EXT_READ;
319 else if (opc >= 0x38 && opc <= 0x3F)
320 opc = PMIC_ARB_OP_EXT_READL;
321 else
322 return -EINVAL;
323
324 cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc);
325
326 raw_spin_lock_irqsave(&pmic_arb->lock, flags);
327 pmic_arb_set_rd_cmd(pmic_arb, offset + PMIC_ARB_CMD, cmd);
328 rc = pmic_arb_wait_for_done(ctrl, pmic_arb->rd_base, sid, addr);
329 if (rc)
330 goto done;
331
332 pa_read_data(pmic_arb, buf, offset + PMIC_ARB_RDATA0,
333 min_t(u8, bc, 3));
334
335 if (bc > 3)
336 pa_read_data(pmic_arb, buf + 4,
337 offset + PMIC_ARB_RDATA1, bc - 4);
338
339 done:
340 raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
341 return rc;
342 }
343
344 static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
345 u16 addr, const u8 *buf, size_t len)
346 {
347 struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
348 unsigned long flags;
349 u8 bc = len - 1;
350 u32 cmd;
351 int rc;
352 u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
353
354 if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
355 dev_err(&ctrl->dev,
356 "pmic-arb supports 1..%d bytes per trans, but:%zu requested",
357 PMIC_ARB_MAX_TRANS_BYTES, len);
358 return -EINVAL;
359 }
360
361 /* Check the opcode */
362 if (opc >= 0x40 && opc <= 0x5F)
363 opc = PMIC_ARB_OP_WRITE;
364 else if (opc >= 0x00 && opc <= 0x0F)
365 opc = PMIC_ARB_OP_EXT_WRITE;
366 else if (opc >= 0x30 && opc <= 0x37)
367 opc = PMIC_ARB_OP_EXT_WRITEL;
368 else if (opc >= 0x80 && opc <= 0xFF)
369 opc = PMIC_ARB_OP_ZERO_WRITE;
370 else
371 return -EINVAL;
372
373 cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc);
374
375 /* Write data to FIFOs */
376 raw_spin_lock_irqsave(&pmic_arb->lock, flags);
377 pa_write_data(pmic_arb, buf, offset + PMIC_ARB_WDATA0,
378 min_t(u8, bc, 3));
379 if (bc > 3)
380 pa_write_data(pmic_arb, buf + 4,
381 offset + PMIC_ARB_WDATA1, bc - 4);
382
383 /* Start the transaction */
384 pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
385 rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, addr);
386 raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
387
388 return rc;
389 }
390
391 enum qpnpint_regs {
392 QPNPINT_REG_RT_STS = 0x10,
393 QPNPINT_REG_SET_TYPE = 0x11,
394 QPNPINT_REG_POLARITY_HIGH = 0x12,
395 QPNPINT_REG_POLARITY_LOW = 0x13,
396 QPNPINT_REG_LATCHED_CLR = 0x14,
397 QPNPINT_REG_EN_SET = 0x15,
398 QPNPINT_REG_EN_CLR = 0x16,
399 QPNPINT_REG_LATCHED_STS = 0x18,
400 };
401
402 struct spmi_pmic_arb_qpnpint_type {
403 u8 type; /* 1 -> edge */
404 u8 polarity_high;
405 u8 polarity_low;
406 } __packed;
407
408 /* Simplified accessor functions for irqchip callbacks */
409 static void qpnpint_spmi_write(struct irq_data *d, u8 reg, void *buf,
410 size_t len)
411 {
412 struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d);
413 u8 sid = d->hwirq >> 24;
414 u8 per = d->hwirq >> 16;
415
416 if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid,
417 (per << 8) + reg, buf, len))
418 dev_err_ratelimited(&pa->spmic->dev,
419 "failed irqchip transaction on %x\n",
420 d->irq);
421 }
422
423 static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len)
424 {
425 struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d);
426 u8 sid = d->hwirq >> 24;
427 u8 per = d->hwirq >> 16;
428
429 if (pmic_arb_read_cmd(pa->spmic, SPMI_CMD_EXT_READL, sid,
430 (per << 8) + reg, buf, len))
431 dev_err_ratelimited(&pa->spmic->dev,
432 "failed irqchip transaction on %x\n",
433 d->irq);
434 }
435
436 static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid)
437 {
438 unsigned int irq;
439 u32 status;
440 int id;
441
442 status = readl_relaxed(pa->intr + pa->ver_ops->irq_status(apid));
443 while (status) {
444 id = ffs(status) - 1;
445 status &= ~(1 << id);
446 irq = irq_find_mapping(pa->domain,
447 pa->apid_to_ppid[apid] << 16
448 | id << 8
449 | apid);
450 generic_handle_irq(irq);
451 }
452 }
453
454 static void pmic_arb_chained_irq(unsigned int irq, struct irq_desc *desc)
455 {
456 struct spmi_pmic_arb_dev *pa = irq_get_handler_data(irq);
457 struct irq_chip *chip = irq_get_chip(irq);
458 void __iomem *intr = pa->intr;
459 int first = pa->min_apid >> 5;
460 int last = pa->max_apid >> 5;
461 u32 status;
462 int i, id;
463
464 chained_irq_enter(chip, desc);
465
466 for (i = first; i <= last; ++i) {
467 status = readl_relaxed(intr +
468 pa->ver_ops->owner_acc_status(pa->ee, i));
469 while (status) {
470 id = ffs(status) - 1;
471 status &= ~(1 << id);
472 periph_interrupt(pa, id + i * 32);
473 }
474 }
475
476 chained_irq_exit(chip, desc);
477 }
478
479 static void qpnpint_irq_ack(struct irq_data *d)
480 {
481 struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d);
482 u8 irq = d->hwirq >> 8;
483 u8 apid = d->hwirq;
484 unsigned long flags;
485 u8 data;
486
487 raw_spin_lock_irqsave(&pa->lock, flags);
488 writel_relaxed(1 << irq, pa->intr + pa->ver_ops->irq_clear(apid));
489 raw_spin_unlock_irqrestore(&pa->lock, flags);
490
491 data = 1 << irq;
492 qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1);
493 }
494
495 static void qpnpint_irq_mask(struct irq_data *d)
496 {
497 struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d);
498 u8 irq = d->hwirq >> 8;
499 u8 apid = d->hwirq;
500 unsigned long flags;
501 u32 status;
502 u8 data;
503
504 raw_spin_lock_irqsave(&pa->lock, flags);
505 status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
506 if (status & SPMI_PIC_ACC_ENABLE_BIT) {
507 status = status & ~SPMI_PIC_ACC_ENABLE_BIT;
508 writel_relaxed(status, pa->intr +
509 pa->ver_ops->acc_enable(apid));
510 }
511 raw_spin_unlock_irqrestore(&pa->lock, flags);
512
513 data = 1 << irq;
514 qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1);
515 }
516
517 static void qpnpint_irq_unmask(struct irq_data *d)
518 {
519 struct spmi_pmic_arb_dev *pa = irq_data_get_irq_chip_data(d);
520 u8 irq = d->hwirq >> 8;
521 u8 apid = d->hwirq;
522 unsigned long flags;
523 u32 status;
524 u8 data;
525
526 raw_spin_lock_irqsave(&pa->lock, flags);
527 status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
528 if (!(status & SPMI_PIC_ACC_ENABLE_BIT)) {
529 writel_relaxed(status | SPMI_PIC_ACC_ENABLE_BIT,
530 pa->intr + pa->ver_ops->acc_enable(apid));
531 }
532 raw_spin_unlock_irqrestore(&pa->lock, flags);
533
534 data = 1 << irq;
535 qpnpint_spmi_write(d, QPNPINT_REG_EN_SET, &data, 1);
536 }
537
538 static void qpnpint_irq_enable(struct irq_data *d)
539 {
540 u8 irq = d->hwirq >> 8;
541 u8 data;
542
543 qpnpint_irq_unmask(d);
544
545 data = 1 << irq;
546 qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1);
547 }
548
549 static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type)
550 {
551 struct spmi_pmic_arb_qpnpint_type type;
552 u8 irq = d->hwirq >> 8;
553
554 qpnpint_spmi_read(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type));
555
556 if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
557 type.type |= 1 << irq;
558 if (flow_type & IRQF_TRIGGER_RISING)
559 type.polarity_high |= 1 << irq;
560 if (flow_type & IRQF_TRIGGER_FALLING)
561 type.polarity_low |= 1 << irq;
562 } else {
563 if ((flow_type & (IRQF_TRIGGER_HIGH)) &&
564 (flow_type & (IRQF_TRIGGER_LOW)))
565 return -EINVAL;
566
567 type.type &= ~(1 << irq); /* level trig */
568 if (flow_type & IRQF_TRIGGER_HIGH)
569 type.polarity_high |= 1 << irq;
570 else
571 type.polarity_low |= 1 << irq;
572 }
573
574 qpnpint_spmi_write(d, QPNPINT_REG_SET_TYPE, &type, sizeof(type));
575 return 0;
576 }
577
578 static struct irq_chip pmic_arb_irqchip = {
579 .name = "pmic_arb",
580 .irq_enable = qpnpint_irq_enable,
581 .irq_ack = qpnpint_irq_ack,
582 .irq_mask = qpnpint_irq_mask,
583 .irq_unmask = qpnpint_irq_unmask,
584 .irq_set_type = qpnpint_irq_set_type,
585 .flags = IRQCHIP_MASK_ON_SUSPEND
586 | IRQCHIP_SKIP_SET_WAKE,
587 };
588
589 struct spmi_pmic_arb_irq_spec {
590 unsigned slave:4;
591 unsigned per:8;
592 unsigned irq:3;
593 };
594
595 static int search_mapping_table(struct spmi_pmic_arb_dev *pa,
596 struct spmi_pmic_arb_irq_spec *spec,
597 u8 *apid)
598 {
599 u16 ppid = spec->slave << 8 | spec->per;
600 u32 *mapping_table = pa->mapping_table;
601 int index = 0, i;
602 u32 data;
603
604 for (i = 0; i < SPMI_MAPPING_TABLE_TREE_DEPTH; ++i) {
605 data = mapping_table[index];
606
607 if (ppid & (1 << SPMI_MAPPING_BIT_INDEX(data))) {
608 if (SPMI_MAPPING_BIT_IS_1_FLAG(data)) {
609 index = SPMI_MAPPING_BIT_IS_1_RESULT(data);
610 } else {
611 *apid = SPMI_MAPPING_BIT_IS_1_RESULT(data);
612 return 0;
613 }
614 } else {
615 if (SPMI_MAPPING_BIT_IS_0_FLAG(data)) {
616 index = SPMI_MAPPING_BIT_IS_0_RESULT(data);
617 } else {
618 *apid = SPMI_MAPPING_BIT_IS_0_RESULT(data);
619 return 0;
620 }
621 }
622 }
623
624 return -ENODEV;
625 }
626
627 static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
628 struct device_node *controller,
629 const u32 *intspec,
630 unsigned int intsize,
631 unsigned long *out_hwirq,
632 unsigned int *out_type)
633 {
634 struct spmi_pmic_arb_dev *pa = d->host_data;
635 struct spmi_pmic_arb_irq_spec spec;
636 int err;
637 u8 apid;
638
639 dev_dbg(&pa->spmic->dev,
640 "intspec[0] 0x%1x intspec[1] 0x%02x intspec[2] 0x%02x\n",
641 intspec[0], intspec[1], intspec[2]);
642
643 if (d->of_node != controller)
644 return -EINVAL;
645 if (intsize != 4)
646 return -EINVAL;
647 if (intspec[0] > 0xF || intspec[1] > 0xFF || intspec[2] > 0x7)
648 return -EINVAL;
649
650 spec.slave = intspec[0];
651 spec.per = intspec[1];
652 spec.irq = intspec[2];
653
654 err = search_mapping_table(pa, &spec, &apid);
655 if (err)
656 return err;
657
658 pa->apid_to_ppid[apid] = spec.slave << 8 | spec.per;
659
660 /* Keep track of {max,min}_apid for bounding search during interrupt */
661 if (apid > pa->max_apid)
662 pa->max_apid = apid;
663 if (apid < pa->min_apid)
664 pa->min_apid = apid;
665
666 *out_hwirq = spec.slave << 24
667 | spec.per << 16
668 | spec.irq << 8
669 | apid;
670 *out_type = intspec[3] & IRQ_TYPE_SENSE_MASK;
671
672 dev_dbg(&pa->spmic->dev, "out_hwirq = %lu\n", *out_hwirq);
673
674 return 0;
675 }
676
677 static int qpnpint_irq_domain_map(struct irq_domain *d,
678 unsigned int virq,
679 irq_hw_number_t hwirq)
680 {
681 struct spmi_pmic_arb_dev *pa = d->host_data;
682
683 dev_dbg(&pa->spmic->dev, "virq = %u, hwirq = %lu\n", virq, hwirq);
684
685 irq_set_chip_and_handler(virq, &pmic_arb_irqchip, handle_level_irq);
686 irq_set_chip_data(virq, d->host_data);
687 irq_set_noprobe(virq);
688 return 0;
689 }
690
691 /* v1 offset per ee */
692 static u32 pmic_arb_offset_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr)
693 {
694 return 0x800 + 0x80 * pa->channel;
695 }
696
697 /* v2 offset per ppid (chan) and per ee */
698 static u32 pmic_arb_offset_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr)
699 {
700 u16 ppid = (sid << 8) | (addr >> 8);
701 u8 chan = pa->ppid_to_chan[ppid];
702
703 return 0x1000 * pa->ee + 0x8000 * chan;
704 }
705
706 static u32 pmic_arb_fmt_cmd_v1(u8 opc, u8 sid, u16 addr, u8 bc)
707 {
708 return (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
709 }
710
711 static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
712 {
713 return (opc << 27) | ((addr & 0xff) << 4) | (bc & 0x7);
714 }
715
716 static u32 pmic_arb_owner_acc_status_v1(u8 m, u8 n)
717 {
718 return 0x20 * m + 0x4 * n;
719 }
720
721 static u32 pmic_arb_owner_acc_status_v2(u8 m, u8 n)
722 {
723 return 0x100000 + 0x1000 * m + 0x4 * n;
724 }
725
726 static u32 pmic_arb_acc_enable_v1(u8 n)
727 {
728 return 0x200 + 0x4 * n;
729 }
730
731 static u32 pmic_arb_acc_enable_v2(u8 n)
732 {
733 return 0x1000 * n;
734 }
735
736 static u32 pmic_arb_irq_status_v1(u8 n)
737 {
738 return 0x600 + 0x4 * n;
739 }
740
741 static u32 pmic_arb_irq_status_v2(u8 n)
742 {
743 return 0x4 + 0x1000 * n;
744 }
745
746 static u32 pmic_arb_irq_clear_v1(u8 n)
747 {
748 return 0xA00 + 0x4 * n;
749 }
750
751 static u32 pmic_arb_irq_clear_v2(u8 n)
752 {
753 return 0x8 + 0x1000 * n;
754 }
755
756 static const struct pmic_arb_ver_ops pmic_arb_v1 = {
757 .non_data_cmd = pmic_arb_non_data_cmd_v1,
758 .offset = pmic_arb_offset_v1,
759 .fmt_cmd = pmic_arb_fmt_cmd_v1,
760 .owner_acc_status = pmic_arb_owner_acc_status_v1,
761 .acc_enable = pmic_arb_acc_enable_v1,
762 .irq_status = pmic_arb_irq_status_v1,
763 .irq_clear = pmic_arb_irq_clear_v1,
764 };
765
766 static const struct pmic_arb_ver_ops pmic_arb_v2 = {
767 .non_data_cmd = pmic_arb_non_data_cmd_v2,
768 .offset = pmic_arb_offset_v2,
769 .fmt_cmd = pmic_arb_fmt_cmd_v2,
770 .owner_acc_status = pmic_arb_owner_acc_status_v2,
771 .acc_enable = pmic_arb_acc_enable_v2,
772 .irq_status = pmic_arb_irq_status_v2,
773 .irq_clear = pmic_arb_irq_clear_v2,
774 };
775
776 static const struct irq_domain_ops pmic_arb_irq_domain_ops = {
777 .map = qpnpint_irq_domain_map,
778 .xlate = qpnpint_irq_domain_dt_translate,
779 };
780
781 static int spmi_pmic_arb_probe(struct platform_device *pdev)
782 {
783 struct spmi_pmic_arb_dev *pa;
784 struct spmi_controller *ctrl;
785 struct resource *res;
786 void __iomem *core;
787 u32 channel, ee, hw_ver;
788 int err, i;
789 bool is_v1;
790
791 ctrl = spmi_controller_alloc(&pdev->dev, sizeof(*pa));
792 if (!ctrl)
793 return -ENOMEM;
794
795 pa = spmi_controller_get_drvdata(ctrl);
796 pa->spmic = ctrl;
797
798 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
799 core = devm_ioremap_resource(&ctrl->dev, res);
800 if (IS_ERR(core)) {
801 err = PTR_ERR(core);
802 goto err_put_ctrl;
803 }
804
805 hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
806 is_v1 = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
807
808 dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2),
809 hw_ver);
810
811 if (is_v1) {
812 pa->ver_ops = &pmic_arb_v1;
813 pa->wr_base = core;
814 pa->rd_base = core;
815 } else {
816 u8 chan;
817 u16 ppid;
818 u32 regval;
819
820 pa->ver_ops = &pmic_arb_v2;
821
822 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
823 "obsrvr");
824 pa->rd_base = devm_ioremap_resource(&ctrl->dev, res);
825 if (IS_ERR(pa->rd_base)) {
826 err = PTR_ERR(pa->rd_base);
827 goto err_put_ctrl;
828 }
829
830 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
831 "chnls");
832 pa->wr_base = devm_ioremap_resource(&ctrl->dev, res);
833 if (IS_ERR(pa->wr_base)) {
834 err = PTR_ERR(pa->wr_base);
835 goto err_put_ctrl;
836 }
837
838 pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
839 PPID_TO_CHAN_TABLE_SZ, GFP_KERNEL);
840 if (!pa->ppid_to_chan) {
841 err = -ENOMEM;
842 goto err_put_ctrl;
843 }
844 /*
845 * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid.
846 * ppid_to_chan is an in-memory invert of that table.
847 */
848 for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
849 regval = readl_relaxed(core + PMIC_ARB_REG_CHNL(chan));
850 if (!regval)
851 continue;
852
853 ppid = (regval >> 8) & 0xFFF;
854 pa->ppid_to_chan[ppid] = chan;
855 }
856 }
857
858 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr");
859 pa->intr = devm_ioremap_resource(&ctrl->dev, res);
860 if (IS_ERR(pa->intr)) {
861 err = PTR_ERR(pa->intr);
862 goto err_put_ctrl;
863 }
864
865 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cnfg");
866 pa->cnfg = devm_ioremap_resource(&ctrl->dev, res);
867 if (IS_ERR(pa->cnfg)) {
868 err = PTR_ERR(pa->cnfg);
869 goto err_put_ctrl;
870 }
871
872 pa->irq = platform_get_irq_byname(pdev, "periph_irq");
873 if (pa->irq < 0) {
874 err = pa->irq;
875 goto err_put_ctrl;
876 }
877
878 err = of_property_read_u32(pdev->dev.of_node, "qcom,channel", &channel);
879 if (err) {
880 dev_err(&pdev->dev, "channel unspecified.\n");
881 goto err_put_ctrl;
882 }
883
884 if (channel > 5) {
885 dev_err(&pdev->dev, "invalid channel (%u) specified.\n",
886 channel);
887 goto err_put_ctrl;
888 }
889
890 pa->channel = channel;
891
892 err = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &ee);
893 if (err) {
894 dev_err(&pdev->dev, "EE unspecified.\n");
895 goto err_put_ctrl;
896 }
897
898 if (ee > 5) {
899 dev_err(&pdev->dev, "invalid EE (%u) specified\n", ee);
900 err = -EINVAL;
901 goto err_put_ctrl;
902 }
903
904 pa->ee = ee;
905
906 for (i = 0; i < ARRAY_SIZE(pa->mapping_table); ++i)
907 pa->mapping_table[i] = readl_relaxed(
908 pa->cnfg + SPMI_MAPPING_TABLE_REG(i));
909
910 /* Initialize max_apid/min_apid to the opposite bounds, during
911 * the irq domain translation, we are sure to update these */
912 pa->max_apid = 0;
913 pa->min_apid = PMIC_ARB_MAX_PERIPHS - 1;
914
915 platform_set_drvdata(pdev, ctrl);
916 raw_spin_lock_init(&pa->lock);
917
918 ctrl->cmd = pmic_arb_cmd;
919 ctrl->read_cmd = pmic_arb_read_cmd;
920 ctrl->write_cmd = pmic_arb_write_cmd;
921
922 dev_dbg(&pdev->dev, "adding irq domain\n");
923 pa->domain = irq_domain_add_tree(pdev->dev.of_node,
924 &pmic_arb_irq_domain_ops, pa);
925 if (!pa->domain) {
926 dev_err(&pdev->dev, "unable to create irq_domain\n");
927 err = -ENOMEM;
928 goto err_put_ctrl;
929 }
930
931 irq_set_handler_data(pa->irq, pa);
932 irq_set_chained_handler(pa->irq, pmic_arb_chained_irq);
933
934 err = spmi_controller_add(ctrl);
935 if (err)
936 goto err_domain_remove;
937
938 return 0;
939
940 err_domain_remove:
941 irq_set_chained_handler(pa->irq, NULL);
942 irq_set_handler_data(pa->irq, NULL);
943 irq_domain_remove(pa->domain);
944 err_put_ctrl:
945 spmi_controller_put(ctrl);
946 return err;
947 }
948
949 static int spmi_pmic_arb_remove(struct platform_device *pdev)
950 {
951 struct spmi_controller *ctrl = platform_get_drvdata(pdev);
952 struct spmi_pmic_arb_dev *pa = spmi_controller_get_drvdata(ctrl);
953 spmi_controller_remove(ctrl);
954 irq_set_chained_handler(pa->irq, NULL);
955 irq_set_handler_data(pa->irq, NULL);
956 irq_domain_remove(pa->domain);
957 spmi_controller_put(ctrl);
958 return 0;
959 }
960
961 static const struct of_device_id spmi_pmic_arb_match_table[] = {
962 { .compatible = "qcom,spmi-pmic-arb", },
963 {},
964 };
965 MODULE_DEVICE_TABLE(of, spmi_pmic_arb_match_table);
966
967 static struct platform_driver spmi_pmic_arb_driver = {
968 .probe = spmi_pmic_arb_probe,
969 .remove = spmi_pmic_arb_remove,
970 .driver = {
971 .name = "spmi_pmic_arb",
972 .of_match_table = spmi_pmic_arb_match_table,
973 },
974 };
975 module_platform_driver(spmi_pmic_arb_driver);
976
977 MODULE_LICENSE("GPL v2");
978 MODULE_ALIAS("platform:spmi_pmic_arb");
Linux kernel - Deliverables
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