1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * OMAP3xxx PRM module functions
4 *
5 * Copyright (C) 2010-2012 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/kernel.h>
13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/io.h>
16#include <linux/irq.h>
17#include <linux/of_irq.h>
18
19#include "soc.h"
20#include "common.h"
21#include "vp.h"
22#include "powerdomain.h"
23#include "prm3xxx.h"
24#include "prm2xxx_3xxx.h"
25#include "cm2xxx_3xxx.h"
26#include "prm-regbits-34xx.h"
27#include "cm3xxx.h"
28#include "cm-regbits-34xx.h"
29#include "clock.h"
30
31static void omap3xxx_prm_read_pending_irqs(unsigned long *events);
32static void omap3xxx_prm_ocp_barrier(void);
33static void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask);
34static void omap3xxx_prm_restore_irqen(u32 *saved_mask);
35static void omap3xxx_prm_iva_idle(void);
36
37static const struct omap_prcm_irq omap3_prcm_irqs[] = {
38 OMAP_PRCM_IRQ("wkup", 0, 0),
39 OMAP_PRCM_IRQ("io", 9, 1),
40};
41
42static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
43 .ack = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
44 .mask = OMAP3_PRM_IRQENABLE_MPU_OFFSET,
45 .nr_regs = 1,
46 .irqs = omap3_prcm_irqs,
47 .nr_irqs = ARRAY_SIZE(omap3_prcm_irqs),
48 .irq = 11 + OMAP_INTC_START,
49 .read_pending_irqs = &omap3xxx_prm_read_pending_irqs,
50 .ocp_barrier = &omap3xxx_prm_ocp_barrier,
51 .save_and_clear_irqen = &omap3xxx_prm_save_and_clear_irqen,
52 .restore_irqen = &omap3xxx_prm_restore_irqen,
53 .reconfigure_io_chain = NULL,
54};
55
56/*
57 * omap3_prm_reset_src_map - map from bits in the PRM_RSTST hardware
58 * register (which are specific to OMAP3xxx SoCs) to reset source ID
59 * bit shifts (which is an OMAP SoC-independent enumeration)
60 */
61static struct prm_reset_src_map omap3xxx_prm_reset_src_map[] = {
62 { OMAP3430_GLOBAL_COLD_RST_SHIFT, OMAP_GLOBAL_COLD_RST_SRC_ID_SHIFT },
63 { OMAP3430_GLOBAL_SW_RST_SHIFT, OMAP_GLOBAL_WARM_RST_SRC_ID_SHIFT },
64 { OMAP3430_SECURITY_VIOL_RST_SHIFT, OMAP_SECU_VIOL_RST_SRC_ID_SHIFT },
65 { OMAP3430_MPU_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
66 { OMAP3430_SECURE_WD_RST_SHIFT, OMAP_MPU_WD_RST_SRC_ID_SHIFT },
67 { OMAP3430_EXTERNAL_WARM_RST_SHIFT, OMAP_EXTWARM_RST_SRC_ID_SHIFT },
68 { OMAP3430_VDD1_VOLTAGE_MANAGER_RST_SHIFT,
69 OMAP_VDD_MPU_VM_RST_SRC_ID_SHIFT },
70 { OMAP3430_VDD2_VOLTAGE_MANAGER_RST_SHIFT,
71 OMAP_VDD_CORE_VM_RST_SRC_ID_SHIFT },
72 { OMAP3430_ICEPICK_RST_SHIFT, OMAP_ICEPICK_RST_SRC_ID_SHIFT },
73 { OMAP3430_ICECRUSHER_RST_SHIFT, OMAP_ICECRUSHER_RST_SRC_ID_SHIFT },
74 { -1, -1 },
75};
76
77/* PRM VP */
78
79/*
80 * struct omap3_vp - OMAP3 VP register access description.
81 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
82 */
83struct omap3_vp {
84 u32 tranxdone_status;
85};
86
87static struct omap3_vp omap3_vp[] = {
88 [OMAP3_VP_VDD_MPU_ID] = {
89 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
90 },
91 [OMAP3_VP_VDD_CORE_ID] = {
92 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
93 },
94};
95
96#define MAX_VP_ID ARRAY_SIZE(omap3_vp);
97
98static u32 omap3_prm_vp_check_txdone(u8 vp_id)
99{
100 struct omap3_vp *vp = &omap3_vp[vp_id];
101 u32 irqstatus;
102
103 irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
104 OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
105 return irqstatus & vp->tranxdone_status;
106}
107
108static void omap3_prm_vp_clear_txdone(u8 vp_id)
109{
110 struct omap3_vp *vp = &omap3_vp[vp_id];
111
112 omap2_prm_write_mod_reg(val: vp->tranxdone_status,
113 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
114}
115
116u32 omap3_prm_vcvp_read(u8 offset)
117{
118 return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, idx: offset);
119}
120
121void omap3_prm_vcvp_write(u32 val, u8 offset)
122{
123 omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, idx: offset);
124}
125
126u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
127{
128 return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, idx: offset);
129}
130
131/**
132 * omap3xxx_prm_dpll3_reset - use DPLL3 reset to reboot the OMAP SoC
133 *
134 * Set the DPLL3 reset bit, which should reboot the SoC. This is the
135 * recommended way to restart the SoC, considering Errata i520. No
136 * return value.
137 */
138static void omap3xxx_prm_dpll3_reset(void)
139{
140 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, OMAP3430_GR_MOD,
141 OMAP2_RM_RSTCTRL);
142 /* OCP barrier */
143 omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP2_RM_RSTCTRL);
144}
145
146/**
147 * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
148 * @events: ptr to a u32, preallocated by caller
149 *
150 * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM
151 * MPU IRQs, and store the result into the u32 pointed to by @events.
152 * No return value.
153 */
154static void omap3xxx_prm_read_pending_irqs(unsigned long *events)
155{
156 u32 mask, st;
157
158 /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */
159 mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
160 st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
161
162 events[0] = mask & st;
163}
164
165/**
166 * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
167 *
168 * Force any buffered writes to the PRM IP block to complete. Needed
169 * by the PRM IRQ handler, which reads and writes directly to the IP
170 * block, to avoid race conditions after acknowledging or clearing IRQ
171 * bits. No return value.
172 */
173static void omap3xxx_prm_ocp_barrier(void)
174{
175 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
176}
177
178/**
179 * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg
180 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
181 *
182 * Save the PRM_IRQENABLE_MPU register to @saved_mask. @saved_mask
183 * must be allocated by the caller. Intended to be used in the PRM
184 * interrupt handler suspend callback. The OCP barrier is needed to
185 * ensure the write to disable PRM interrupts reaches the PRM before
186 * returning; otherwise, spurious interrupts might occur. No return
187 * value.
188 */
189static void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask)
190{
191 saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD,
192 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
193 omap2_prm_write_mod_reg(val: 0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
194
195 /* OCP barrier */
196 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
197}
198
199/**
200 * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args
201 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
202 *
203 * Restore the PRM_IRQENABLE_MPU register from @saved_mask. Intended
204 * to be used in the PRM interrupt handler resume callback to restore
205 * values saved by omap3xxx_prm_save_and_clear_irqen(). No OCP
206 * barrier should be needed here; any pending PRM interrupts will fire
207 * once the writes reach the PRM. No return value.
208 */
209static void omap3xxx_prm_restore_irqen(u32 *saved_mask)
210{
211 omap2_prm_write_mod_reg(val: saved_mask[0], OCP_MOD,
212 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
213}
214
215/**
216 * omap3xxx_prm_clear_mod_irqs - clear wake-up events from PRCM interrupt
217 * @module: PRM module to clear wakeups from
218 * @regs: register set to clear, 1 or 3
219 * @wkst_mask: wkst bits to clear
220 *
221 * The purpose of this function is to clear any wake-up events latched
222 * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
223 * may occur whilst attempting to clear a PM_WKST_x register and thus
224 * set another bit in this register. A while loop is used to ensure
225 * that any peripheral wake-up events occurring while attempting to
226 * clear the PM_WKST_x are detected and cleared.
227 */
228static int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 wkst_mask)
229{
230 u32 wkst, fclk, iclk, clken;
231 u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
232 u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
233 u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
234 u16 grpsel_off = (regs == 3) ?
235 OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
236 int c = 0;
237
238 wkst = omap2_prm_read_mod_reg(module, idx: wkst_off);
239 wkst &= omap2_prm_read_mod_reg(module, idx: grpsel_off);
240 wkst &= wkst_mask;
241 if (wkst) {
242 iclk = omap2_cm_read_mod_reg(module, idx: iclk_off);
243 fclk = omap2_cm_read_mod_reg(module, idx: fclk_off);
244 while (wkst) {
245 clken = wkst;
246 omap2_cm_set_mod_reg_bits(bits: clken, module, idx: iclk_off);
247 /*
248 * For USBHOST, we don't know whether HOST1 or
249 * HOST2 woke us up, so enable both f-clocks
250 */
251 if (module == OMAP3430ES2_USBHOST_MOD)
252 clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
253 omap2_cm_set_mod_reg_bits(bits: clken, module, idx: fclk_off);
254 omap2_prm_write_mod_reg(val: wkst, module, idx: wkst_off);
255 wkst = omap2_prm_read_mod_reg(module, idx: wkst_off);
256 wkst &= wkst_mask;
257 c++;
258 }
259 omap2_cm_write_mod_reg(val: iclk, module, idx: iclk_off);
260 omap2_cm_write_mod_reg(val: fclk, module, idx: fclk_off);
261 }
262
263 return c;
264}
265
266/**
267 * omap3_prm_reset_modem - toggle reset signal for modem
268 *
269 * Toggles the reset signal to modem IP block. Required to allow
270 * OMAP3430 without stacked modem to idle properly.
271 */
272static void __init omap3_prm_reset_modem(void)
273{
274 omap2_prm_write_mod_reg(
275 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RSTPWRON_MASK |
276 OMAP3430_RM_RSTCTRL_CORE_MODEM_SW_RST_MASK,
277 CORE_MOD, OMAP2_RM_RSTCTRL);
278 omap2_prm_write_mod_reg(val: 0, CORE_MOD, OMAP2_RM_RSTCTRL);
279}
280
281/**
282 * omap3_prm_init_pm - initialize PM related registers for PRM
283 * @has_uart4: SoC has UART4
284 * @has_iva: SoC has IVA
285 *
286 * Initializes PRM registers for PM use. Called from PM init.
287 */
288void __init omap3_prm_init_pm(bool has_uart4, bool has_iva)
289{
290 u32 en_uart4_mask;
291 u32 grpsel_uart4_mask;
292
293 /*
294 * Enable control of expternal oscillator through
295 * sys_clkreq. In the long run clock framework should
296 * take care of this.
297 */
298 omap2_prm_rmw_mod_reg_bits(OMAP_AUTOEXTCLKMODE_MASK,
299 bits: 1 << OMAP_AUTOEXTCLKMODE_SHIFT,
300 OMAP3430_GR_MOD,
301 OMAP3_PRM_CLKSRC_CTRL_OFFSET);
302
303 /* setup wakup source */
304 omap2_prm_write_mod_reg(OMAP3430_EN_IO_MASK | OMAP3430_EN_GPIO1_MASK |
305 OMAP3430_EN_GPT1_MASK | OMAP3430_EN_GPT12_MASK,
306 WKUP_MOD, PM_WKEN);
307 /* No need to write EN_IO, that is always enabled */
308 omap2_prm_write_mod_reg(OMAP3430_GRPSEL_GPIO1_MASK |
309 OMAP3430_GRPSEL_GPT1_MASK |
310 OMAP3430_GRPSEL_GPT12_MASK,
311 WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
312
313 /* Enable PM_WKEN to support DSS LPR */
314 omap2_prm_write_mod_reg(OMAP3430_PM_WKEN_DSS_EN_DSS_MASK,
315 OMAP3430_DSS_MOD, PM_WKEN);
316
317 if (has_uart4) {
318 en_uart4_mask = OMAP3630_EN_UART4_MASK;
319 grpsel_uart4_mask = OMAP3630_GRPSEL_UART4_MASK;
320 } else {
321 en_uart4_mask = 0;
322 grpsel_uart4_mask = 0;
323 }
324
325 /* Enable wakeups in PER */
326 omap2_prm_write_mod_reg(val: en_uart4_mask |
327 OMAP3430_EN_GPIO2_MASK |
328 OMAP3430_EN_GPIO3_MASK |
329 OMAP3430_EN_GPIO4_MASK |
330 OMAP3430_EN_GPIO5_MASK |
331 OMAP3430_EN_GPIO6_MASK |
332 OMAP3430_EN_UART3_MASK |
333 OMAP3430_EN_MCBSP2_MASK |
334 OMAP3430_EN_MCBSP3_MASK |
335 OMAP3430_EN_MCBSP4_MASK,
336 OMAP3430_PER_MOD, PM_WKEN);
337
338 /* and allow them to wake up MPU */
339 omap2_prm_write_mod_reg(val: grpsel_uart4_mask |
340 OMAP3430_GRPSEL_GPIO2_MASK |
341 OMAP3430_GRPSEL_GPIO3_MASK |
342 OMAP3430_GRPSEL_GPIO4_MASK |
343 OMAP3430_GRPSEL_GPIO5_MASK |
344 OMAP3430_GRPSEL_GPIO6_MASK |
345 OMAP3430_GRPSEL_UART3_MASK |
346 OMAP3430_GRPSEL_MCBSP2_MASK |
347 OMAP3430_GRPSEL_MCBSP3_MASK |
348 OMAP3430_GRPSEL_MCBSP4_MASK,
349 OMAP3430_PER_MOD, OMAP3430_PM_MPUGRPSEL);
350
351 /* Don't attach IVA interrupts */
352 if (has_iva) {
353 omap2_prm_write_mod_reg(val: 0, WKUP_MOD, OMAP3430_PM_IVAGRPSEL);
354 omap2_prm_write_mod_reg(val: 0, CORE_MOD, OMAP3430_PM_IVAGRPSEL1);
355 omap2_prm_write_mod_reg(val: 0, CORE_MOD, OMAP3430ES2_PM_IVAGRPSEL3);
356 omap2_prm_write_mod_reg(val: 0, OMAP3430_PER_MOD,
357 OMAP3430_PM_IVAGRPSEL);
358 }
359
360 /* Clear any pending 'reset' flags */
361 omap2_prm_write_mod_reg(val: 0xffffffff, MPU_MOD, OMAP2_RM_RSTST);
362 omap2_prm_write_mod_reg(val: 0xffffffff, CORE_MOD, OMAP2_RM_RSTST);
363 omap2_prm_write_mod_reg(val: 0xffffffff, OMAP3430_PER_MOD, OMAP2_RM_RSTST);
364 omap2_prm_write_mod_reg(val: 0xffffffff, OMAP3430_EMU_MOD, OMAP2_RM_RSTST);
365 omap2_prm_write_mod_reg(val: 0xffffffff, OMAP3430_NEON_MOD, OMAP2_RM_RSTST);
366 omap2_prm_write_mod_reg(val: 0xffffffff, OMAP3430_DSS_MOD, OMAP2_RM_RSTST);
367 omap2_prm_write_mod_reg(val: 0xffffffff, OMAP3430ES2_USBHOST_MOD,
368 OMAP2_RM_RSTST);
369
370 /* Clear any pending PRCM interrupts */
371 omap2_prm_write_mod_reg(val: 0, OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
372
373 /* We need to idle iva2_pwrdm even on am3703 with no iva2. */
374 omap3xxx_prm_iva_idle();
375
376 omap3_prm_reset_modem();
377}
378
379/**
380 * omap3430_pre_es3_1_reconfigure_io_chain - restart wake-up daisy chain
381 *
382 * The ST_IO_CHAIN bit does not exist in 3430 before es3.1. The only
383 * thing we can do is toggle EN_IO bit for earlier omaps.
384 */
385static void omap3430_pre_es3_1_reconfigure_io_chain(void)
386{
387 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
388 PM_WKEN);
389 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
390 PM_WKEN);
391 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKEN);
392}
393
394/**
395 * omap3_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
396 *
397 * Clear any previously-latched I/O wakeup events and ensure that the
398 * I/O wakeup gates are aligned with the current mux settings. Works
399 * by asserting WUCLKIN, waiting for WUCLKOUT to be asserted, and then
400 * deasserting WUCLKIN and clearing the ST_IO_CHAIN WKST bit. No
401 * return value. These registers are only available in 3430 es3.1 and later.
402 */
403static void omap3_prm_reconfigure_io_chain(void)
404{
405 int i = 0;
406
407 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
408 PM_WKEN);
409
410 omap_test_timeout(omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST) &
411 OMAP3430_ST_IO_CHAIN_MASK,
412 MAX_IOPAD_LATCH_TIME, i);
413 if (i == MAX_IOPAD_LATCH_TIME)
414 pr_warn("PRM: I/O chain clock line assertion timed out\n");
415
416 omap2_prm_clear_mod_reg_bits(OMAP3430_EN_IO_CHAIN_MASK, WKUP_MOD,
417 PM_WKEN);
418
419 omap2_prm_set_mod_reg_bits(OMAP3430_ST_IO_CHAIN_MASK, WKUP_MOD,
420 PM_WKST);
421
422 omap2_prm_read_mod_reg(WKUP_MOD, PM_WKST);
423}
424
425/**
426 * omap3xxx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
427 *
428 * Activates the I/O wakeup event latches and allows events logged by
429 * those latches to signal a wakeup event to the PRCM. For I/O
430 * wakeups to occur, WAKEUPENABLE bits must be set in the pad mux
431 * registers, and omap3xxx_prm_reconfigure_io_chain() must be called.
432 * No return value.
433 */
434static void omap3xxx_prm_enable_io_wakeup(void)
435{
436 if (prm_features & PRM_HAS_IO_WAKEUP)
437 omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
438 PM_WKEN);
439}
440
441/**
442 * omap3xxx_prm_read_reset_sources - return the last SoC reset source
443 *
444 * Return a u32 representing the last reset sources of the SoC. The
445 * returned reset source bits are standardized across OMAP SoCs.
446 */
447static u32 omap3xxx_prm_read_reset_sources(void)
448{
449 struct prm_reset_src_map *p;
450 u32 r = 0;
451 u32 v;
452
453 v = omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST);
454
455 p = omap3xxx_prm_reset_src_map;
456 while (p->reg_shift >= 0 && p->std_shift >= 0) {
457 if (v & (1 << p->reg_shift))
458 r |= 1 << p->std_shift;
459 p++;
460 }
461
462 return r;
463}
464
465/**
466 * omap3xxx_prm_iva_idle - ensure IVA is in idle so it can be put into retention
467 *
468 * In cases where IVA2 is activated by bootcode, it may prevent
469 * full-chip retention or off-mode because it is not idle. This
470 * function forces the IVA2 into idle state so it can go
471 * into retention/off and thus allow full-chip retention/off.
472 */
473static void omap3xxx_prm_iva_idle(void)
474{
475 /* ensure IVA2 clock is disabled */
476 omap2_cm_write_mod_reg(val: 0, OMAP3430_IVA2_MOD, CM_FCLKEN);
477
478 /* if no clock activity, nothing else to do */
479 if (!(omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD, OMAP3430_CM_CLKSTST) &
480 OMAP3430_CLKACTIVITY_IVA2_MASK))
481 return;
482
483 /* Reset IVA2 */
484 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
485 OMAP3430_RST2_IVA2_MASK |
486 OMAP3430_RST3_IVA2_MASK,
487 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
488
489 /* Enable IVA2 clock */
490 omap2_cm_write_mod_reg(OMAP3430_CM_FCLKEN_IVA2_EN_IVA2_MASK,
491 OMAP3430_IVA2_MOD, CM_FCLKEN);
492
493 /* Un-reset IVA2 */
494 omap2_prm_write_mod_reg(val: 0, OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
495
496 /* Disable IVA2 clock */
497 omap2_cm_write_mod_reg(val: 0, OMAP3430_IVA2_MOD, CM_FCLKEN);
498
499 /* Reset IVA2 */
500 omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
501 OMAP3430_RST2_IVA2_MASK |
502 OMAP3430_RST3_IVA2_MASK,
503 OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
504}
505
506/**
507 * omap3xxx_prm_clear_global_cold_reset - checks the global cold reset status
508 * and clears it if asserted
509 *
510 * Checks if cold-reset has occurred and clears the status bit if yes. Returns
511 * 1 if cold-reset has occurred, 0 otherwise.
512 */
513int omap3xxx_prm_clear_global_cold_reset(void)
514{
515 if (omap2_prm_read_mod_reg(OMAP3430_GR_MOD, OMAP3_PRM_RSTST_OFFSET) &
516 OMAP3430_GLOBAL_COLD_RST_MASK) {
517 omap2_prm_set_mod_reg_bits(OMAP3430_GLOBAL_COLD_RST_MASK,
518 OMAP3430_GR_MOD,
519 OMAP3_PRM_RSTST_OFFSET);
520 return 1;
521 }
522
523 return 0;
524}
525
526void omap3_prm_save_scratchpad_contents(u32 *ptr)
527{
528 *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD,
529 OMAP3_PRM_CLKSRC_CTRL_OFFSET);
530
531 *ptr++ = omap2_prm_read_mod_reg(OMAP3430_GR_MOD,
532 OMAP3_PRM_CLKSEL_OFFSET);
533}
534
535/* Powerdomain low-level functions */
536
537static int omap3_pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
538{
539 omap2_prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
540 bits: (pwrst << OMAP_POWERSTATE_SHIFT),
541 module: pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
542 return 0;
543}
544
545static int omap3_pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
546{
547 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
548 OMAP2_PM_PWSTCTRL,
549 OMAP_POWERSTATE_MASK);
550}
551
552static int omap3_pwrdm_read_pwrst(struct powerdomain *pwrdm)
553{
554 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
555 OMAP2_PM_PWSTST,
556 OMAP_POWERSTATEST_MASK);
557}
558
559/* Applicable only for OMAP3. Not supported on OMAP2 */
560static int omap3_pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
561{
562 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
563 OMAP3430_PM_PREPWSTST,
564 OMAP3430_LASTPOWERSTATEENTERED_MASK);
565}
566
567static int omap3_pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
568{
569 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
570 OMAP2_PM_PWSTST,
571 OMAP3430_LOGICSTATEST_MASK);
572}
573
574static int omap3_pwrdm_read_logic_retst(struct powerdomain *pwrdm)
575{
576 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
577 OMAP2_PM_PWSTCTRL,
578 OMAP3430_LOGICSTATEST_MASK);
579}
580
581static int omap3_pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
582{
583 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
584 OMAP3430_PM_PREPWSTST,
585 OMAP3430_LASTLOGICSTATEENTERED_MASK);
586}
587
588static int omap3_get_mem_bank_lastmemst_mask(u8 bank)
589{
590 switch (bank) {
591 case 0:
592 return OMAP3430_LASTMEM1STATEENTERED_MASK;
593 case 1:
594 return OMAP3430_LASTMEM2STATEENTERED_MASK;
595 case 2:
596 return OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
597 case 3:
598 return OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
599 default:
600 WARN_ON(1); /* should never happen */
601 return -EEXIST;
602 }
603 return 0;
604}
605
606static int omap3_pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
607{
608 u32 m;
609
610 m = omap3_get_mem_bank_lastmemst_mask(bank);
611
612 return omap2_prm_read_mod_bits_shift(domain: pwrdm->prcm_offs,
613 OMAP3430_PM_PREPWSTST, mask: m);
614}
615
616static int omap3_pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
617{
618 omap2_prm_write_mod_reg(val: 0, module: pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
619 return 0;
620}
621
622static int omap3_pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
623{
624 return omap2_prm_rmw_mod_reg_bits(mask: 0,
625 bits: 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
626 module: pwrdm->prcm_offs, OMAP2_PM_PWSTCTRL);
627}
628
629static int omap3_pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
630{
631 return omap2_prm_rmw_mod_reg_bits(mask: 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
632 bits: 0, module: pwrdm->prcm_offs,
633 OMAP2_PM_PWSTCTRL);
634}
635
636struct pwrdm_ops omap3_pwrdm_operations = {
637 .pwrdm_set_next_pwrst = omap3_pwrdm_set_next_pwrst,
638 .pwrdm_read_next_pwrst = omap3_pwrdm_read_next_pwrst,
639 .pwrdm_read_pwrst = omap3_pwrdm_read_pwrst,
640 .pwrdm_read_prev_pwrst = omap3_pwrdm_read_prev_pwrst,
641 .pwrdm_set_logic_retst = omap2_pwrdm_set_logic_retst,
642 .pwrdm_read_logic_pwrst = omap3_pwrdm_read_logic_pwrst,
643 .pwrdm_read_logic_retst = omap3_pwrdm_read_logic_retst,
644 .pwrdm_read_prev_logic_pwrst = omap3_pwrdm_read_prev_logic_pwrst,
645 .pwrdm_set_mem_onst = omap2_pwrdm_set_mem_onst,
646 .pwrdm_set_mem_retst = omap2_pwrdm_set_mem_retst,
647 .pwrdm_read_mem_pwrst = omap2_pwrdm_read_mem_pwrst,
648 .pwrdm_read_mem_retst = omap2_pwrdm_read_mem_retst,
649 .pwrdm_read_prev_mem_pwrst = omap3_pwrdm_read_prev_mem_pwrst,
650 .pwrdm_clear_all_prev_pwrst = omap3_pwrdm_clear_all_prev_pwrst,
651 .pwrdm_enable_hdwr_sar = omap3_pwrdm_enable_hdwr_sar,
652 .pwrdm_disable_hdwr_sar = omap3_pwrdm_disable_hdwr_sar,
653 .pwrdm_wait_transition = omap2_pwrdm_wait_transition,
654};
655
656/*
657 *
658 */
659
660static int omap3xxx_prm_late_init(void);
661
662static struct prm_ll_data omap3xxx_prm_ll_data = {
663 .read_reset_sources = &omap3xxx_prm_read_reset_sources,
664 .late_init = &omap3xxx_prm_late_init,
665 .assert_hardreset = &omap2_prm_assert_hardreset,
666 .deassert_hardreset = &omap2_prm_deassert_hardreset,
667 .is_hardreset_asserted = &omap2_prm_is_hardreset_asserted,
668 .reset_system = &omap3xxx_prm_dpll3_reset,
669 .clear_mod_irqs = &omap3xxx_prm_clear_mod_irqs,
670 .vp_check_txdone = &omap3_prm_vp_check_txdone,
671 .vp_clear_txdone = &omap3_prm_vp_clear_txdone,
672};
673
674int __init omap3xxx_prm_init(const struct omap_prcm_init_data *data)
675{
676 omap2_clk_legacy_provider_init(index: TI_CLKM_PRM,
677 mem: prm_base.va + OMAP3430_IVA2_MOD);
678 if (omap3_has_io_wakeup())
679 prm_features |= PRM_HAS_IO_WAKEUP;
680
681 return prm_register(pld: &omap3xxx_prm_ll_data);
682}
683
684static const struct of_device_id omap3_prm_dt_match_table[] = {
685 { .compatible = "ti,omap3-prm" },
686 { }
687};
688
689static int omap3xxx_prm_late_init(void)
690{
691 struct device_node *np;
692 int irq_num;
693
694 if (!(prm_features & PRM_HAS_IO_WAKEUP))
695 return 0;
696
697 if (omap3_has_io_chain_ctrl())
698 omap3_prcm_irq_setup.reconfigure_io_chain =
699 omap3_prm_reconfigure_io_chain;
700 else
701 omap3_prcm_irq_setup.reconfigure_io_chain =
702 omap3430_pre_es3_1_reconfigure_io_chain;
703
704 np = of_find_matching_node(NULL, matches: omap3_prm_dt_match_table);
705 if (!np) {
706 pr_err("PRM: no device tree node for interrupt?\n");
707
708 return -ENODEV;
709 }
710
711 irq_num = of_irq_get(dev: np, index: 0);
712 of_node_put(node: np);
713 if (irq_num == -EPROBE_DEFER)
714 return irq_num;
715
716 omap3_prcm_irq_setup.irq = irq_num;
717
718 omap3xxx_prm_enable_io_wakeup();
719
720 return omap_prcm_register_chain_handler(irq_setup: &omap3_prcm_irq_setup);
721}
722
723static void __exit omap3xxx_prm_exit(void)
724{
725 prm_unregister(pld: &omap3xxx_prm_ll_data);
726}
727__exitcall(omap3xxx_prm_exit);
728

source code of linux/arch/arm/mach-omap2/prm3xxx.c