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1/*
2 * OMAP2/3 PRM module functions
3 *
4 * Copyright (C) 2010-2011 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
6 * Benoît Cousson
7 * Paul Walmsley
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/err.h>
17#include <linux/io.h>
18#include <linux/irq.h>
19
20#include "common.h"
21#include <plat/cpu.h>
22#include <plat/prcm.h>
23#include <plat/irqs.h>
24
25#include "vp.h"
26
27#include "prm2xxx_3xxx.h"
28#include "cm2xxx_3xxx.h"
29#include "prm-regbits-24xx.h"
30#include "prm-regbits-34xx.h"
31
32static const struct omap_prcm_irq omap3_prcm_irqs[] = {
33 OMAP_PRCM_IRQ("wkup", 0, 0),
34 OMAP_PRCM_IRQ("io", 9, 1),
35};
36
37static struct omap_prcm_irq_setup omap3_prcm_irq_setup = {
38 .ack = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
39 .mask = OMAP3_PRM_IRQENABLE_MPU_OFFSET,
40 .nr_regs = 1,
41 .irqs = omap3_prcm_irqs,
42 .nr_irqs = ARRAY_SIZE(omap3_prcm_irqs),
43 .irq = INT_34XX_PRCM_MPU_IRQ,
44 .read_pending_irqs = &omap3xxx_prm_read_pending_irqs,
45 .ocp_barrier = &omap3xxx_prm_ocp_barrier,
46 .save_and_clear_irqen = &omap3xxx_prm_save_and_clear_irqen,
47 .restore_irqen = &omap3xxx_prm_restore_irqen,
48};
49
50u32 omap2_prm_read_mod_reg(s16 module, u16 idx)
51{
52 return __raw_readl(prm_base + module + idx);
53}
54
55void omap2_prm_write_mod_reg(u32 val, s16 module, u16 idx)
56{
57 __raw_writel(val, prm_base + module + idx);
58}
59
60/* Read-modify-write a register in a PRM module. Caller must lock */
61u32 omap2_prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
62{
63 u32 v;
64
65 v = omap2_prm_read_mod_reg(module, idx);
66 v &= ~mask;
67 v |= bits;
68 omap2_prm_write_mod_reg(v, module, idx);
69
70 return v;
71}
72
73/* Read a PRM register, AND it, and shift the result down to bit 0 */
74u32 omap2_prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
75{
76 u32 v;
77
78 v = omap2_prm_read_mod_reg(domain, idx);
79 v &= mask;
80 v >>= __ffs(mask);
81
82 return v;
83}
84
85u32 omap2_prm_set_mod_reg_bits(u32 bits, s16 module, s16 idx)
86{
87 return omap2_prm_rmw_mod_reg_bits(bits, bits, module, idx);
88}
89
90u32 omap2_prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx)
91{
92 return omap2_prm_rmw_mod_reg_bits(bits, 0x0, module, idx);
93}
94
95
96/**
97 * omap2_prm_is_hardreset_asserted - read the HW reset line state of
98 * submodules contained in the hwmod module
99 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
100 * @shift: register bit shift corresponding to the reset line to check
101 *
102 * Returns 1 if the (sub)module hardreset line is currently asserted,
103 * 0 if the (sub)module hardreset line is not currently asserted, or
104 * -EINVAL if called while running on a non-OMAP2/3 chip.
105 */
106int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift)
107{
108 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
109 return -EINVAL;
110
111 return omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL,
112 (1 << shift));
113}
114
115/**
116 * omap2_prm_assert_hardreset - assert the HW reset line of a submodule
117 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
118 * @shift: register bit shift corresponding to the reset line to assert
119 *
120 * Some IPs like dsp or iva contain processors that require an HW
121 * reset line to be asserted / deasserted in order to fully enable the
122 * IP. These modules may have multiple hard-reset lines that reset
123 * different 'submodules' inside the IP block. This function will
124 * place the submodule into reset. Returns 0 upon success or -EINVAL
125 * upon an argument error.
126 */
127int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift)
128{
129 u32 mask;
130
131 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
132 return -EINVAL;
133
134 mask = 1 << shift;
135 omap2_prm_rmw_mod_reg_bits(mask, mask, prm_mod, OMAP2_RM_RSTCTRL);
136
137 return 0;
138}
139
140/**
141 * omap2_prm_deassert_hardreset - deassert a submodule hardreset line and wait
142 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
143 * @rst_shift: register bit shift corresponding to the reset line to deassert
144 * @st_shift: register bit shift for the status of the deasserted submodule
145 *
146 * Some IPs like dsp or iva contain processors that require an HW
147 * reset line to be asserted / deasserted in order to fully enable the
148 * IP. These modules may have multiple hard-reset lines that reset
149 * different 'submodules' inside the IP block. This function will
150 * take the submodule out of reset and wait until the PRCM indicates
151 * that the reset has completed before returning. Returns 0 upon success or
152 * -EINVAL upon an argument error, -EEXIST if the submodule was already out
153 * of reset, or -EBUSY if the submodule did not exit reset promptly.
154 */
155int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
156{
157 u32 rst, st;
158 int c;
159
160 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
161 return -EINVAL;
162
163 rst = 1 << rst_shift;
164 st = 1 << st_shift;
165
166 /* Check the current status to avoid de-asserting the line twice */
167 if (omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, rst) == 0)
168 return -EEXIST;
169
170 /* Clear the reset status by writing 1 to the status bit */
171 omap2_prm_rmw_mod_reg_bits(0xffffffff, st, prm_mod, OMAP2_RM_RSTST);
172 /* de-assert the reset control line */
173 omap2_prm_rmw_mod_reg_bits(rst, 0, prm_mod, OMAP2_RM_RSTCTRL);
174 /* wait the status to be set */
175 omap_test_timeout(omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTST,
176 st),
177 MAX_MODULE_HARDRESET_WAIT, c);
178
179 return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
180}
181
182/* PRM VP */
183
184/*
185 * struct omap3_vp - OMAP3 VP register access description.
186 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
187 */
188struct omap3_vp {
189 u32 tranxdone_status;
190};
191
192static struct omap3_vp omap3_vp[] = {
193 [OMAP3_VP_VDD_MPU_ID] = {
194 .tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
195 },
196 [OMAP3_VP_VDD_CORE_ID] = {
197 .tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
198 },
199};
200
201#define MAX_VP_ID ARRAY_SIZE(omap3_vp);
202
203u32 omap3_prm_vp_check_txdone(u8 vp_id)
204{
205 struct omap3_vp *vp = &omap3_vp[vp_id];
206 u32 irqstatus;
207
208 irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
209 OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
210 return irqstatus & vp->tranxdone_status;
211}
212
213void omap3_prm_vp_clear_txdone(u8 vp_id)
214{
215 struct omap3_vp *vp = &omap3_vp[vp_id];
216
217 omap2_prm_write_mod_reg(vp->tranxdone_status,
218 OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
219}
220
221u32 omap3_prm_vcvp_read(u8 offset)
222{
223 return omap2_prm_read_mod_reg(OMAP3430_GR_MOD, offset);
224}
225
226void omap3_prm_vcvp_write(u32 val, u8 offset)
227{
228 omap2_prm_write_mod_reg(val, OMAP3430_GR_MOD, offset);
229}
230
231u32 omap3_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
232{
233 return omap2_prm_rmw_mod_reg_bits(mask, bits, OMAP3430_GR_MOD, offset);
234}
235
236/**
237 * omap3xxx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
238 * @events: ptr to a u32, preallocated by caller
239 *
240 * Read PRM_IRQSTATUS_MPU bits, AND'ed with the currently-enabled PRM
241 * MPU IRQs, and store the result into the u32 pointed to by @events.
242 * No return value.
243 */
244void omap3xxx_prm_read_pending_irqs(unsigned long *events)
245{
246 u32 mask, st;
247
248 /* XXX Can the mask read be avoided (e.g., can it come from RAM?) */
249 mask = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
250 st = omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
251
252 events[0] = mask & st;
253}
254
255/**
256 * omap3xxx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
257 *
258 * Force any buffered writes to the PRM IP block to complete. Needed
259 * by the PRM IRQ handler, which reads and writes directly to the IP
260 * block, to avoid race conditions after acknowledging or clearing IRQ
261 * bits. No return value.
262 */
263void omap3xxx_prm_ocp_barrier(void)
264{
265 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
266}
267
268/**
269 * omap3xxx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU reg
270 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
271 *
272 * Save the PRM_IRQENABLE_MPU register to @saved_mask. @saved_mask
273 * must be allocated by the caller. Intended to be used in the PRM
274 * interrupt handler suspend callback. The OCP barrier is needed to
275 * ensure the write to disable PRM interrupts reaches the PRM before
276 * returning; otherwise, spurious interrupts might occur. No return
277 * value.
278 */
279void omap3xxx_prm_save_and_clear_irqen(u32 *saved_mask)
280{
281 saved_mask[0] = omap2_prm_read_mod_reg(OCP_MOD,
282 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
283 omap2_prm_write_mod_reg(0, OCP_MOD, OMAP3_PRM_IRQENABLE_MPU_OFFSET);
284
285 /* OCP barrier */
286 omap2_prm_read_mod_reg(OCP_MOD, OMAP3_PRM_REVISION_OFFSET);
287}
288
289/**
290 * omap3xxx_prm_restore_irqen - set PRM_IRQENABLE_MPU register from args
291 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
292 *
293 * Restore the PRM_IRQENABLE_MPU register from @saved_mask. Intended
294 * to be used in the PRM interrupt handler resume callback to restore
295 * values saved by omap3xxx_prm_save_and_clear_irqen(). No OCP
296 * barrier should be needed here; any pending PRM interrupts will fire
297 * once the writes reach the PRM. No return value.
298 */
299void omap3xxx_prm_restore_irqen(u32 *saved_mask)
300{
301 omap2_prm_write_mod_reg(saved_mask[0], OCP_MOD,
302 OMAP3_PRM_IRQENABLE_MPU_OFFSET);
303}
304
305static int __init omap3xxx_prcm_init(void)
306{
307 int ret = 0;
308
309 if (cpu_is_omap34xx()) {
310 ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
311 if (!ret)
312 irq_set_status_flags(omap_prcm_event_to_irq("io"),
313 IRQ_NOAUTOEN);
314 }
315
316 return ret;
317}
318subsys_initcall(omap3xxx_prcm_init);
1/*
2 * OMAP2/3 PRM module functions
3 *
4 * Copyright (C) 2010-2011 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
6 * Benoît Cousson
7 * Paul Walmsley
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/err.h>
17#include <linux/io.h>
18
19#include "common.h"
20#include "powerdomain.h"
21#include "prm2xxx_3xxx.h"
22#include "prm-regbits-24xx.h"
23#include "clockdomain.h"
24
25/**
26 * omap2_prm_is_hardreset_asserted - read the HW reset line state of
27 * submodules contained in the hwmod module
28 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
29 * @shift: register bit shift corresponding to the reset line to check
30 *
31 * Returns 1 if the (sub)module hardreset line is currently asserted,
32 * 0 if the (sub)module hardreset line is not currently asserted, or
33 * -EINVAL if called while running on a non-OMAP2/3 chip.
34 */
35int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift)
36{
37 return omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL,
38 (1 << shift));
39}
40
41/**
42 * omap2_prm_assert_hardreset - assert the HW reset line of a submodule
43 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
44 * @shift: register bit shift corresponding to the reset line to assert
45 *
46 * Some IPs like dsp or iva contain processors that require an HW
47 * reset line to be asserted / deasserted in order to fully enable the
48 * IP. These modules may have multiple hard-reset lines that reset
49 * different 'submodules' inside the IP block. This function will
50 * place the submodule into reset. Returns 0 upon success or -EINVAL
51 * upon an argument error.
52 */
53int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift)
54{
55 u32 mask;
56
57 mask = 1 << shift;
58 omap2_prm_rmw_mod_reg_bits(mask, mask, prm_mod, OMAP2_RM_RSTCTRL);
59
60 return 0;
61}
62
63/**
64 * omap2_prm_deassert_hardreset - deassert a submodule hardreset line and wait
65 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
66 * @rst_shift: register bit shift corresponding to the reset line to deassert
67 * @st_shift: register bit shift for the status of the deasserted submodule
68 *
69 * Some IPs like dsp or iva contain processors that require an HW
70 * reset line to be asserted / deasserted in order to fully enable the
71 * IP. These modules may have multiple hard-reset lines that reset
72 * different 'submodules' inside the IP block. This function will
73 * take the submodule out of reset and wait until the PRCM indicates
74 * that the reset has completed before returning. Returns 0 upon success or
75 * -EINVAL upon an argument error, -EEXIST if the submodule was already out
76 * of reset, or -EBUSY if the submodule did not exit reset promptly.
77 */
78int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
79{
80 u32 rst, st;
81 int c;
82
83 rst = 1 << rst_shift;
84 st = 1 << st_shift;
85
86 /* Check the current status to avoid de-asserting the line twice */
87 if (omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, rst) == 0)
88 return -EEXIST;
89
90 /* Clear the reset status by writing 1 to the status bit */
91 omap2_prm_rmw_mod_reg_bits(0xffffffff, st, prm_mod, OMAP2_RM_RSTST);
92 /* de-assert the reset control line */
93 omap2_prm_rmw_mod_reg_bits(rst, 0, prm_mod, OMAP2_RM_RSTCTRL);
94 /* wait the status to be set */
95 omap_test_timeout(omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTST,
96 st),
97 MAX_MODULE_HARDRESET_WAIT, c);
98
99 return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
100}
101
102
103/* Powerdomain low-level functions */
104
105/* Common functions across OMAP2 and OMAP3 */
106int omap2_pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank,
107 u8 pwrst)
108{
109 u32 m;
110
111 m = omap2_pwrdm_get_mem_bank_onstate_mask(bank);
112
113 omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
114 OMAP2_PM_PWSTCTRL);
115
116 return 0;
117}
118
119int omap2_pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank,
120 u8 pwrst)
121{
122 u32 m;
123
124 m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
125
126 omap2_prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
127 OMAP2_PM_PWSTCTRL);
128
129 return 0;
130}
131
132int omap2_pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
133{
134 u32 m;
135
136 m = omap2_pwrdm_get_mem_bank_stst_mask(bank);
137
138 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP2_PM_PWSTST,
139 m);
140}
141
142int omap2_pwrdm_read_mem_retst(struct powerdomain *pwrdm, u8 bank)
143{
144 u32 m;
145
146 m = omap2_pwrdm_get_mem_bank_retst_mask(bank);
147
148 return omap2_prm_read_mod_bits_shift(pwrdm->prcm_offs,
149 OMAP2_PM_PWSTCTRL, m);
150}
151
152int omap2_pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
153{
154 u32 v;
155
156 v = pwrst << __ffs(OMAP_LOGICRETSTATE_MASK);
157 omap2_prm_rmw_mod_reg_bits(OMAP_LOGICRETSTATE_MASK, v, pwrdm->prcm_offs,
158 OMAP2_PM_PWSTCTRL);
159
160 return 0;
161}
162
163int omap2_pwrdm_wait_transition(struct powerdomain *pwrdm)
164{
165 u32 c = 0;
166
167 /*
168 * REVISIT: pwrdm_wait_transition() may be better implemented
169 * via a callback and a periodic timer check -- how long do we expect
170 * powerdomain transitions to take?
171 */
172
173 /* XXX Is this udelay() value meaningful? */
174 while ((omap2_prm_read_mod_reg(pwrdm->prcm_offs, OMAP2_PM_PWSTST) &
175 OMAP_INTRANSITION_MASK) &&
176 (c++ < PWRDM_TRANSITION_BAILOUT))
177 udelay(1);
178
179 if (c > PWRDM_TRANSITION_BAILOUT) {
180 pr_err("powerdomain: %s: waited too long to complete transition\n",
181 pwrdm->name);
182 return -EAGAIN;
183 }
184
185 pr_debug("powerdomain: completed transition in %d loops\n", c);
186
187 return 0;
188}
189
190int omap2_clkdm_add_wkdep(struct clockdomain *clkdm1,
191 struct clockdomain *clkdm2)
192{
193 omap2_prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
194 clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
195 return 0;
196}
197
198int omap2_clkdm_del_wkdep(struct clockdomain *clkdm1,
199 struct clockdomain *clkdm2)
200{
201 omap2_prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
202 clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
203 return 0;
204}
205
206int omap2_clkdm_read_wkdep(struct clockdomain *clkdm1,
207 struct clockdomain *clkdm2)
208{
209 return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
210 PM_WKDEP, (1 << clkdm2->dep_bit));
211}
212
213/* XXX Caller must hold the clkdm's powerdomain lock */
214int omap2_clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
215{
216 struct clkdm_dep *cd;
217 u32 mask = 0;
218
219 for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
220 if (!cd->clkdm)
221 continue; /* only happens if data is erroneous */
222
223 /* PRM accesses are slow, so minimize them */
224 mask |= 1 << cd->clkdm->dep_bit;
225 cd->wkdep_usecount = 0;
226 }
227
228 omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
229 PM_WKDEP);
230 return 0;
231}
232