1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP4 PRM module functions
4 *
5 * Copyright (C) 2011-2012 Texas Instruments, Inc.
6 * Copyright (C) 2010 Nokia Corporation
7 * Benoît Cousson
8 * Paul Walmsley
9 * Rajendra Nayak <rnayak@ti.com>
10 */
11
12#include <linux/cpu_pm.h>
13#include <linux/kernel.h>
14#include <linux/delay.h>
15#include <linux/errno.h>
16#include <linux/err.h>
17#include <linux/io.h>
18#include <linux/of_irq.h>
19#include <linux/of.h>
20
21#include "soc.h"
22#include "iomap.h"
23#include "common.h"
24#include "vp.h"
25#include "prm44xx.h"
26#include "prcm43xx.h"
27#include "prm-regbits-44xx.h"
28#include "prcm44xx.h"
29#include "prminst44xx.h"
30#include "powerdomain.h"
31#include "pm.h"
32
33/* Static data */
34
35static void omap44xx_prm_read_pending_irqs(unsigned long *events);
36static void omap44xx_prm_ocp_barrier(void);
37static void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask);
38static void omap44xx_prm_restore_irqen(u32 *saved_mask);
39static void omap44xx_prm_reconfigure_io_chain(void);
40
41static const struct omap_prcm_irq omap4_prcm_irqs[] = {
42 OMAP_PRCM_IRQ("io", 9, 1),
43};
44
45static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
46 .ack = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
47 .mask = OMAP4_PRM_IRQENABLE_MPU_OFFSET,
48 .pm_ctrl = OMAP4_PRM_IO_PMCTRL_OFFSET,
49 .nr_regs = 2,
50 .irqs = omap4_prcm_irqs,
51 .nr_irqs = ARRAY_SIZE(omap4_prcm_irqs),
52 .read_pending_irqs = &omap44xx_prm_read_pending_irqs,
53 .ocp_barrier = &omap44xx_prm_ocp_barrier,
54 .save_and_clear_irqen = &omap44xx_prm_save_and_clear_irqen,
55 .restore_irqen = &omap44xx_prm_restore_irqen,
56 .reconfigure_io_chain = &omap44xx_prm_reconfigure_io_chain,
57};
58
59struct omap_prm_irq_context {
60 unsigned long irq_enable;
61 unsigned long pm_ctrl;
62};
63
64static struct omap_prm_irq_context omap_prm_context;
65
66/*
67 * omap44xx_prm_reset_src_map - map from bits in the PRM_RSTST
68 * hardware register (which are specific to OMAP44xx SoCs) to reset
69 * source ID bit shifts (which is an OMAP SoC-independent
70 * enumeration)
71 */
72static struct prm_reset_src_map omap44xx_prm_reset_src_map[] = {
73 { OMAP4430_GLOBAL_WARM_SW_RST_SHIFT,
74 OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
75 { OMAP4430_GLOBAL_COLD_RST_SHIFT,
76 OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
77 { OMAP4430_MPU_SECURITY_VIOL_RST_SHIFT,
78 OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
79 { OMAP4430_MPU_WDT_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
80 { OMAP4430_SECURE_WDT_RST_SHIFT, OMAP_SECU_WD_RST_SRC_ID_SHIFT },
81 { OMAP4430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
82 { OMAP4430_VDD_MPU_VOLT_MGR_RST_SHIFT,
83 OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
84 { OMAP4430_VDD_IVA_VOLT_MGR_RST_SHIFT,
85 OMAP_VDD_IVA_VM_RST_SRC_ID_SHIFT },
86 { OMAP4430_VDD_CORE_VOLT_MGR_RST_SHIFT,
87 OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
88 { OMAP4430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
89 { OMAP4430_C2C_RST_SHIFT, OMAP_C2C_RST_SRC_ID_SHIFT },
90 { -1, -1 },
91};
92
93/* PRM low-level functions */
94
95/* Read a register in a CM/PRM instance in the PRM module */
96static u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
97{
98 return readl_relaxed(prm_base.va + inst + reg);
99}
100
101/* Write into a register in a CM/PRM instance in the PRM module */
102static void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
103{
104 writel_relaxed(val, prm_base.va + inst + reg);
105}
106
107/* Read-modify-write a register in a PRM module. Caller must lock */
108static u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
109{
110 u32 v;
111
112 v = omap4_prm_read_inst_reg(inst, reg);
113 v &= ~mask;
114 v |= bits;
115 omap4_prm_write_inst_reg(val: v, inst, reg);
116
117 return v;
118}
119
120/* PRM VP */
121
122/*
123 * struct omap4_vp - OMAP4 VP register access description.
124 * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
125 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
126 */
127struct omap4_vp {
128 u32 irqstatus_mpu;
129 u32 tranxdone_status;
130};
131
132static struct omap4_vp omap4_vp[] = {
133 [OMAP4_VP_VDD_MPU_ID] = {
134 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
135 .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
136 },
137 [OMAP4_VP_VDD_IVA_ID] = {
138 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
139 .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
140 },
141 [OMAP4_VP_VDD_CORE_ID] = {
142 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
143 .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
144 },
145};
146
147static u32 omap4_prm_vp_check_txdone(u8 vp_id)
148{
149 struct omap4_vp *vp = &omap4_vp[vp_id];
150 u32 irqstatus;
151
152 irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
153 OMAP4430_PRM_OCP_SOCKET_INST,
154 idx: vp->irqstatus_mpu);
155 return irqstatus & vp->tranxdone_status;
156}
157
158static void omap4_prm_vp_clear_txdone(u8 vp_id)
159{
160 struct omap4_vp *vp = &omap4_vp[vp_id];
161
162 omap4_prminst_write_inst_reg(val: vp->tranxdone_status,
163 OMAP4430_PRM_PARTITION,
164 OMAP4430_PRM_OCP_SOCKET_INST,
165 idx: vp->irqstatus_mpu);
166};
167
168u32 omap4_prm_vcvp_read(u8 offset)
169{
170 s32 inst = omap4_prmst_get_prm_dev_inst();
171
172 if (inst == PRM_INSTANCE_UNKNOWN)
173 return 0;
174
175 return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
176 inst, idx: offset);
177}
178
179void omap4_prm_vcvp_write(u32 val, u8 offset)
180{
181 s32 inst = omap4_prmst_get_prm_dev_inst();
182
183 if (inst == PRM_INSTANCE_UNKNOWN)
184 return;
185
186 omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
187 inst, idx: offset);
188}
189
190u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
191{
192 s32 inst = omap4_prmst_get_prm_dev_inst();
193
194 if (inst == PRM_INSTANCE_UNKNOWN)
195 return 0;
196
197 return omap4_prminst_rmw_inst_reg_bits(mask, bits,
198 OMAP4430_PRM_PARTITION,
199 inst,
200 idx: offset);
201}
202
203static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
204{
205 u32 mask, st;
206
207 /* XXX read mask from RAM? */
208 mask = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
209 reg: irqen_offs);
210 st = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, reg: irqst_offs);
211
212 return mask & st;
213}
214
215/**
216 * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
217 * @events: ptr to two consecutive u32s, preallocated by caller
218 *
219 * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
220 * MPU IRQs, and store the result into the two u32s pointed to by @events.
221 * No return value.
222 */
223static void omap44xx_prm_read_pending_irqs(unsigned long *events)
224{
225 int i;
226
227 for (i = 0; i < omap4_prcm_irq_setup.nr_regs; i++)
228 events[i] = _read_pending_irq_reg(irqen_offs: omap4_prcm_irq_setup.mask +
229 i * 4, irqst_offs: omap4_prcm_irq_setup.ack + i * 4);
230}
231
232/**
233 * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
234 *
235 * Force any buffered writes to the PRM IP block to complete. Needed
236 * by the PRM IRQ handler, which reads and writes directly to the IP
237 * block, to avoid race conditions after acknowledging or clearing IRQ
238 * bits. No return value.
239 */
240static void omap44xx_prm_ocp_barrier(void)
241{
242 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
243 OMAP4_REVISION_PRM_OFFSET);
244}
245
246/**
247 * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
248 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
249 *
250 * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
251 * @saved_mask. @saved_mask must be allocated by the caller.
252 * Intended to be used in the PRM interrupt handler suspend callback.
253 * The OCP barrier is needed to ensure the write to disable PRM
254 * interrupts reaches the PRM before returning; otherwise, spurious
255 * interrupts might occur. No return value.
256 */
257static void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
258{
259 int i;
260 u16 reg;
261
262 for (i = 0; i < omap4_prcm_irq_setup.nr_regs; i++) {
263 reg = omap4_prcm_irq_setup.mask + i * 4;
264
265 saved_mask[i] =
266 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
267 reg);
268 omap4_prm_write_inst_reg(val: 0, OMAP4430_PRM_OCP_SOCKET_INST, reg);
269 }
270
271 /* OCP barrier */
272 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
273 OMAP4_REVISION_PRM_OFFSET);
274}
275
276/**
277 * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
278 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
279 *
280 * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
281 * @saved_mask. Intended to be used in the PRM interrupt handler resume
282 * callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
283 * No OCP barrier should be needed here; any pending PRM interrupts will fire
284 * once the writes reach the PRM. No return value.
285 */
286static void omap44xx_prm_restore_irqen(u32 *saved_mask)
287{
288 int i;
289
290 for (i = 0; i < omap4_prcm_irq_setup.nr_regs; i++)
291 omap4_prm_write_inst_reg(val: saved_mask[i],
292 OMAP4430_PRM_OCP_SOCKET_INST,
293 reg: omap4_prcm_irq_setup.mask + i * 4);
294}
295
296/**
297 * omap44xx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
298 *
299 * Clear any previously-latched I/O wakeup events and ensure that the
300 * I/O wakeup gates are aligned with the current mux settings. Works
301 * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
302 * deasserting WUCLKIN and waiting for WUCLKOUT to be deasserted.
303 * No return value. XXX Are the final two steps necessary?
304 */
305static void omap44xx_prm_reconfigure_io_chain(void)
306{
307 int i = 0;
308 s32 inst = omap4_prmst_get_prm_dev_inst();
309
310 if (inst == PRM_INSTANCE_UNKNOWN)
311 return;
312
313 /* Trigger WUCLKIN enable */
314 omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK,
315 OMAP4430_WUCLK_CTRL_MASK,
316 inst,
317 reg: omap4_prcm_irq_setup.pm_ctrl);
318 omap_test_timeout(
319 (((omap4_prm_read_inst_reg(inst,
320 omap4_prcm_irq_setup.pm_ctrl) &
321 OMAP4430_WUCLK_STATUS_MASK) >>
322 OMAP4430_WUCLK_STATUS_SHIFT) == 1),
323 MAX_IOPAD_LATCH_TIME, i);
324 if (i == MAX_IOPAD_LATCH_TIME)
325 pr_warn("PRM: I/O chain clock line assertion timed out\n");
326
327 /* Trigger WUCLKIN disable */
328 omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, bits: 0x0,
329 inst,
330 reg: omap4_prcm_irq_setup.pm_ctrl);
331 omap_test_timeout(
332 (((omap4_prm_read_inst_reg(inst,
333 omap4_prcm_irq_setup.pm_ctrl) &
334 OMAP4430_WUCLK_STATUS_MASK) >>
335 OMAP4430_WUCLK_STATUS_SHIFT) == 0),
336 MAX_IOPAD_LATCH_TIME, i);
337 if (i == MAX_IOPAD_LATCH_TIME)
338 pr_warn("PRM: I/O chain clock line deassertion timed out\n");
339
340 return;
341}
342
343/**
344 * omap44xx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
345 *
346 * Activates the I/O wakeup event latches and allows events logged by
347 * those latches to signal a wakeup event to the PRCM. For I/O wakeups
348 * to occur, WAKEUPENABLE bits must be set in the pad mux registers, and
349 * omap44xx_prm_reconfigure_io_chain() must be called. No return value.
350 */
351static void omap44xx_prm_enable_io_wakeup(void)
352{
353 s32 inst = omap4_prmst_get_prm_dev_inst();
354
355 if (inst == PRM_INSTANCE_UNKNOWN)
356 return;
357
358 omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
359 OMAP4430_GLOBAL_WUEN_MASK,
360 inst,
361 reg: omap4_prcm_irq_setup.pm_ctrl);
362}
363
364/**
365 * omap44xx_prm_read_reset_sources - return the last SoC reset source
366 *
367 * Return a u32 representing the last reset sources of the SoC. The
368 * returned reset source bits are standardized across OMAP SoCs.
369 */
370static u32 omap44xx_prm_read_reset_sources(void)
371{
372 struct prm_reset_src_map *p;
373 u32 r = 0;
374 u32 v;
375 s32 inst = omap4_prmst_get_prm_dev_inst();
376
377 if (inst == PRM_INSTANCE_UNKNOWN)
378 return 0;
379
380
381 v = omap4_prm_read_inst_reg(inst,
382 OMAP4_RM_RSTST);
383
384 p = omap44xx_prm_reset_src_map;
385 while (p->reg_shift >= 0 && p->std_shift >= 0) {
386 if (v & (1 << p->reg_shift))
387 r |= 1 << p->std_shift;
388 p++;
389 }
390
391 return r;
392}
393
394/**
395 * omap44xx_prm_was_any_context_lost_old - was module hardware context lost?
396 * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION)
397 * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST)
398 * @idx: CONTEXT register offset
399 *
400 * Return 1 if any bits were set in the *_CONTEXT_* register
401 * identified by (@part, @inst, @idx), which means that some context
402 * was lost for that module; otherwise, return 0.
403 */
404static bool omap44xx_prm_was_any_context_lost_old(u8 part, s16 inst, u16 idx)
405{
406 return (omap4_prminst_read_inst_reg(part, inst, idx)) ? 1 : 0;
407}
408
409/**
410 * omap44xx_prm_clear_context_lost_flags_old - clear context loss flags
411 * @part: PRM partition ID (e.g., OMAP4430_PRM_PARTITION)
412 * @inst: PRM instance offset (e.g., OMAP4430_PRM_MPU_INST)
413 * @idx: CONTEXT register offset
414 *
415 * Clear hardware context loss bits for the module identified by
416 * (@part, @inst, @idx). No return value. XXX Writes to reserved bits;
417 * is there a way to avoid this?
418 */
419static void omap44xx_prm_clear_context_loss_flags_old(u8 part, s16 inst,
420 u16 idx)
421{
422 omap4_prminst_write_inst_reg(val: 0xffffffff, part, inst, idx);
423}
424
425/* Powerdomain low-level functions */
426
427static int omap4_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
428{
429 omap4_prminst_rmw_inst_reg_bits(OMAP_POWERSTATE_MASK,
430 bits: (pwrst << OMAP_POWERSTATE_SHIFT),
431 part: pwrdm->prcm_partition,
432 inst: pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
433 return 0;
434}
435
436static int omap4_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
437{
438 u32 v;
439
440 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
441 OMAP4_PM_PWSTCTRL);
442 v &= OMAP_POWERSTATE_MASK;
443 v >>= OMAP_POWERSTATE_SHIFT;
444
445 return v;
446}
447
448static int omap4_pwrdm_read_pwrst(struct powerdomain *pwrdm)
449{
450 u32 v;
451
452 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
453 OMAP4_PM_PWSTST);
454 v &= OMAP_POWERSTATEST_MASK;
455 v >>= OMAP_POWERSTATEST_SHIFT;
456
457 return v;
458}
459
460static int omap4_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
461{
462 u32 v;
463
464 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
465 OMAP4_PM_PWSTST);
466 v &= OMAP4430_LASTPOWERSTATEENTERED_MASK;
467 v >>= OMAP4430_LASTPOWERSTATEENTERED_SHIFT;
468
469 return v;
470}
471
472static int omap4_pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
473{
474 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
475 bits: (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
476 part: pwrdm->prcm_partition,
477 inst: pwrdm->prcm_offs, OMAP4_PM_PWSTCTRL);
478 return 0;
479}
480
481static int omap4_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
482{
483 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LASTPOWERSTATEENTERED_MASK,
484 OMAP4430_LASTPOWERSTATEENTERED_MASK,
485 part: pwrdm->prcm_partition,
486 inst: pwrdm->prcm_offs, OMAP4_PM_PWSTST);
487 return 0;
488}
489
490static int omap4_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
491{
492 u32 v;
493
494 v = pwrst << __ffs(OMAP4430_LOGICRETSTATE_MASK);
495 omap4_prminst_rmw_inst_reg_bits(OMAP4430_LOGICRETSTATE_MASK, bits: v,
496 part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
497 OMAP4_PM_PWSTCTRL);
498
499 return 0;
500}
501
502static int omap4_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
503 u8 pwrst)
504{
505 u32 m;
506
507 m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
508
509 omap4_prminst_rmw_inst_reg_bits(mask: m, bits: (pwrst << __ffs(m)),
510 part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
511 OMAP4_PM_PWSTCTRL);
512
513 return 0;
514}
515
516static int omap4_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
517 u8 pwrst)
518{
519 u32 m;
520
521 m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
522
523 omap4_prminst_rmw_inst_reg_bits(mask: m, bits: (pwrst << __ffs(m)),
524 part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
525 OMAP4_PM_PWSTCTRL);
526
527 return 0;
528}
529
530static int omap4_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
531{
532 u32 v;
533
534 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
535 OMAP4_PM_PWSTST);
536 v &= OMAP4430_LOGICSTATEST_MASK;
537 v >>= OMAP4430_LOGICSTATEST_SHIFT;
538
539 return v;
540}
541
542static int omap4_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
543{
544 u32 v;
545
546 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
547 OMAP4_PM_PWSTCTRL);
548 v &= OMAP4430_LOGICRETSTATE_MASK;
549 v >>= OMAP4430_LOGICRETSTATE_SHIFT;
550
551 return v;
552}
553
554/**
555 * omap4_pwrdm_read_prev_logic_pwrst - read the previous logic powerstate
556 * @pwrdm: struct powerdomain * to read the state for
557 *
558 * Reads the previous logic powerstate for a powerdomain. This
559 * function must determine the previous logic powerstate by first
560 * checking the previous powerstate for the domain. If that was OFF,
561 * then logic has been lost. If previous state was RETENTION, the
562 * function reads the setting for the next retention logic state to
563 * see the actual value. In every other case, the logic is
564 * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
565 * depending whether the logic was retained or not.
566 */
567static int omap4_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
568{
569 int state;
570
571 state = omap4_pwrdm_read_prev_pwrst(pwrdm);
572
573 if (state == PWRDM_POWER_OFF)
574 return PWRDM_POWER_OFF;
575
576 if (state != PWRDM_POWER_RET)
577 return PWRDM_POWER_RET;
578
579 return omap4_pwrdm_read_logic_retst(pwrdm);
580}
581
582static int omap4_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
583{
584 u32 m, v;
585
586 m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
587
588 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
589 OMAP4_PM_PWSTST);
590 v &= m;
591 v >>= __ffs(m);
592
593 return v;
594}
595
596static int omap4_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
597{
598 u32 m, v;
599
600 m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
601
602 v = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition, inst: pwrdm->prcm_offs,
603 OMAP4_PM_PWSTCTRL);
604 v &= m;
605 v >>= __ffs(m);
606
607 return v;
608}
609
610/**
611 * omap4_pwrdm_read_prev_mem_pwrst - reads the previous memory powerstate
612 * @pwrdm: struct powerdomain * to read mem powerstate for
613 * @bank: memory bank index
614 *
615 * Reads the previous memory powerstate for a powerdomain. This
616 * function must determine the previous memory powerstate by first
617 * checking the previous powerstate for the domain. If that was OFF,
618 * then logic has been lost. If previous state was RETENTION, the
619 * function reads the setting for the next memory retention state to
620 * see the actual value. In every other case, the logic is
621 * retained. Returns either PWRDM_POWER_OFF or PWRDM_POWER_RET
622 * depending whether logic was retained or not.
623 */
624static int omap4_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
625{
626 int state;
627
628 state = omap4_pwrdm_read_prev_pwrst(pwrdm);
629
630 if (state == PWRDM_POWER_OFF)
631 return PWRDM_POWER_OFF;
632
633 if (state != PWRDM_POWER_RET)
634 return PWRDM_POWER_RET;
635
636 return omap4_pwrdm_read_mem_retst(pwrdm, bank);
637}
638
639static int omap4_pwrdm_wait_transition(struct powerdomain *pwrdm)
640{
641 u32 c = 0;
642
643 /*
644 * REVISIT: pwrdm_wait_transition() may be better implemented
645 * via a callback and a periodic timer check -- how long do we expect
646 * powerdomain transitions to take?
647 */
648
649 /* XXX Is this udelay() value meaningful? */
650 while ((omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition,
651 inst: pwrdm->prcm_offs,
652 OMAP4_PM_PWSTST) &
653 OMAP_INTRANSITION_MASK) &&
654 (c++ < PWRDM_TRANSITION_BAILOUT))
655 udelay(1);
656
657 if (c > PWRDM_TRANSITION_BAILOUT) {
658 pr_err("powerdomain: %s: waited too long to complete transition\n",
659 pwrdm->name);
660 return -EAGAIN;
661 }
662
663 pr_debug("powerdomain: completed transition in %d loops\n", c);
664
665 return 0;
666}
667
668static int omap4_check_vcvp(void)
669{
670 if (prm_features & PRM_HAS_VOLTAGE)
671 return 1;
672
673 return 0;
674}
675
676/**
677 * omap4_pwrdm_save_context - Saves the powerdomain state
678 * @pwrdm: pointer to individual powerdomain
679 *
680 * The function saves the powerdomain state control information.
681 * This is needed in rtc+ddr modes where we lose powerdomain context.
682 */
683static void omap4_pwrdm_save_context(struct powerdomain *pwrdm)
684{
685 pwrdm->context = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition,
686 inst: pwrdm->prcm_offs,
687 idx: pwrdm->pwrstctrl_offs);
688
689 /*
690 * Do not save LOWPOWERSTATECHANGE, writing a 1 indicates a request,
691 * reading back a 1 indicates a request in progress.
692 */
693 pwrdm->context &= ~OMAP4430_LOWPOWERSTATECHANGE_MASK;
694}
695
696/**
697 * omap4_pwrdm_restore_context - Restores the powerdomain state
698 * @pwrdm: pointer to individual powerdomain
699 *
700 * The function restores the powerdomain state control information.
701 * This is needed in rtc+ddr modes where we lose powerdomain context.
702 */
703static void omap4_pwrdm_restore_context(struct powerdomain *pwrdm)
704{
705 int st, ctrl;
706
707 st = omap4_prminst_read_inst_reg(part: pwrdm->prcm_partition,
708 inst: pwrdm->prcm_offs,
709 idx: pwrdm->pwrstctrl_offs);
710
711 omap4_prminst_write_inst_reg(val: pwrdm->context,
712 part: pwrdm->prcm_partition,
713 inst: pwrdm->prcm_offs,
714 idx: pwrdm->pwrstctrl_offs);
715
716 /* Make sure we only wait for a transition if there is one */
717 st &= OMAP_POWERSTATEST_MASK;
718 ctrl = OMAP_POWERSTATEST_MASK & pwrdm->context;
719
720 if (st != ctrl)
721 omap4_pwrdm_wait_transition(pwrdm);
722}
723
724struct pwrdm_ops omap4_pwrdm_operations = {
725 .pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst,
726 .pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst,
727 .pwrdm_read_pwrst = omap4_pwrdm_read_pwrst,
728 .pwrdm_read_prev_pwrst = omap4_pwrdm_read_prev_pwrst,
729 .pwrdm_set_lowpwrstchange = omap4_pwrdm_set_lowpwrstchange,
730 .pwrdm_clear_all_prev_pwrst = omap4_pwrdm_clear_all_prev_pwrst,
731 .pwrdm_set_logic_retst = omap4_pwrdm_set_logic_retst,
732 .pwrdm_read_logic_pwrst = omap4_pwrdm_read_logic_pwrst,
733 .pwrdm_read_prev_logic_pwrst = omap4_pwrdm_read_prev_logic_pwrst,
734 .pwrdm_read_logic_retst = omap4_pwrdm_read_logic_retst,
735 .pwrdm_read_mem_pwrst = omap4_pwrdm_read_mem_pwrst,
736 .pwrdm_read_mem_retst = omap4_pwrdm_read_mem_retst,
737 .pwrdm_read_prev_mem_pwrst = omap4_pwrdm_read_prev_mem_pwrst,
738 .pwrdm_set_mem_onst = omap4_pwrdm_set_mem_onst,
739 .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst,
740 .pwrdm_wait_transition = omap4_pwrdm_wait_transition,
741 .pwrdm_has_voltdm = omap4_check_vcvp,
742 .pwrdm_save_context = omap4_pwrdm_save_context,
743 .pwrdm_restore_context = omap4_pwrdm_restore_context,
744};
745
746static int omap44xx_prm_late_init(void);
747
748static void prm_save_context(void)
749{
750 omap_prm_context.irq_enable =
751 omap4_prm_read_inst_reg(AM43XX_PRM_OCP_SOCKET_INST,
752 reg: omap4_prcm_irq_setup.mask);
753
754 omap_prm_context.pm_ctrl =
755 omap4_prm_read_inst_reg(AM43XX_PRM_DEVICE_INST,
756 reg: omap4_prcm_irq_setup.pm_ctrl);
757}
758
759static void prm_restore_context(void)
760{
761 omap4_prm_write_inst_reg(val: omap_prm_context.irq_enable,
762 OMAP4430_PRM_OCP_SOCKET_INST,
763 reg: omap4_prcm_irq_setup.mask);
764
765 omap4_prm_write_inst_reg(val: omap_prm_context.pm_ctrl,
766 AM43XX_PRM_DEVICE_INST,
767 reg: omap4_prcm_irq_setup.pm_ctrl);
768}
769
770static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v)
771{
772 switch (cmd) {
773 case CPU_CLUSTER_PM_ENTER:
774 if (enable_off_mode)
775 prm_save_context();
776 break;
777 case CPU_CLUSTER_PM_EXIT:
778 if (enable_off_mode)
779 prm_restore_context();
780 break;
781 }
782
783 return NOTIFY_OK;
784}
785
786/*
787 * XXX document
788 */
789static struct prm_ll_data omap44xx_prm_ll_data = {
790 .read_reset_sources = &omap44xx_prm_read_reset_sources,
791 .was_any_context_lost_old = &omap44xx_prm_was_any_context_lost_old,
792 .clear_context_loss_flags_old = &omap44xx_prm_clear_context_loss_flags_old,
793 .late_init = &omap44xx_prm_late_init,
794 .assert_hardreset = omap4_prminst_assert_hardreset,
795 .deassert_hardreset = omap4_prminst_deassert_hardreset,
796 .is_hardreset_asserted = omap4_prminst_is_hardreset_asserted,
797 .reset_system = omap4_prminst_global_warm_sw_reset,
798 .vp_check_txdone = omap4_prm_vp_check_txdone,
799 .vp_clear_txdone = omap4_prm_vp_clear_txdone,
800};
801
802static const struct omap_prcm_init_data *prm_init_data;
803
804int __init omap44xx_prm_init(const struct omap_prcm_init_data *data)
805{
806 static struct notifier_block nb;
807 omap_prm_base_init();
808
809 prm_init_data = data;
810
811 if (data->flags & PRM_HAS_IO_WAKEUP)
812 prm_features |= PRM_HAS_IO_WAKEUP;
813
814 if (data->flags & PRM_HAS_VOLTAGE)
815 prm_features |= PRM_HAS_VOLTAGE;
816
817 omap4_prminst_set_prm_dev_inst(dev_inst: data->device_inst_offset);
818
819 /* Add AM437X specific differences */
820 if (of_device_is_compatible(device: data->np, "ti,am4-prcm")) {
821 omap4_prcm_irq_setup.nr_irqs = 1;
822 omap4_prcm_irq_setup.nr_regs = 1;
823 omap4_prcm_irq_setup.pm_ctrl = AM43XX_PRM_IO_PMCTRL_OFFSET;
824 omap4_prcm_irq_setup.ack = AM43XX_PRM_IRQSTATUS_MPU_OFFSET;
825 omap4_prcm_irq_setup.mask = AM43XX_PRM_IRQENABLE_MPU_OFFSET;
826 }
827
828 /* Only AM43XX can lose prm context during rtc-ddr suspend */
829 if (soc_is_am43xx()) {
830 nb.notifier_call = cpu_notifier;
831 cpu_pm_register_notifier(nb: &nb);
832 }
833
834 return prm_register(pld: &omap44xx_prm_ll_data);
835}
836
837static int omap44xx_prm_late_init(void)
838{
839 int irq_num;
840
841 if (!(prm_features & PRM_HAS_IO_WAKEUP))
842 return 0;
843
844 irq_num = of_irq_get(dev: prm_init_data->np, index: 0);
845 if (irq_num == -EPROBE_DEFER)
846 return irq_num;
847
848 omap4_prcm_irq_setup.irq = irq_num;
849
850 omap44xx_prm_enable_io_wakeup();
851
852 return omap_prcm_register_chain_handler(irq_setup: &omap4_prcm_irq_setup);
853}
854
855static void __exit omap44xx_prm_exit(void)
856{
857 prm_unregister(pld: &omap44xx_prm_ll_data);
858}
859__exitcall(omap44xx_prm_exit);
860

source code of linux/arch/arm/mach-omap2/prm44xx.c