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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 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 <plat/common.h>
20#include <plat/cpu.h>
21#include <plat/prcm.h>
22
23#include "prm2xxx_3xxx.h"
24#include "cm2xxx_3xxx.h"
25#include "prm-regbits-24xx.h"
26#include "prm-regbits-34xx.h"
27
28u32 omap2_prm_read_mod_reg(s16 module, u16 idx)
29{
30 return __raw_readl(prm_base + module + idx);
31}
32
33void omap2_prm_write_mod_reg(u32 val, s16 module, u16 idx)
34{
35 __raw_writel(val, prm_base + module + idx);
36}
37
38/* Read-modify-write a register in a PRM module. Caller must lock */
39u32 omap2_prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
40{
41 u32 v;
42
43 v = omap2_prm_read_mod_reg(module, idx);
44 v &= ~mask;
45 v |= bits;
46 omap2_prm_write_mod_reg(v, module, idx);
47
48 return v;
49}
50
51/* Read a PRM register, AND it, and shift the result down to bit 0 */
52u32 omap2_prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
53{
54 u32 v;
55
56 v = omap2_prm_read_mod_reg(domain, idx);
57 v &= mask;
58 v >>= __ffs(mask);
59
60 return v;
61}
62
63u32 omap2_prm_set_mod_reg_bits(u32 bits, s16 module, s16 idx)
64{
65 return omap2_prm_rmw_mod_reg_bits(bits, bits, module, idx);
66}
67
68u32 omap2_prm_clear_mod_reg_bits(u32 bits, s16 module, s16 idx)
69{
70 return omap2_prm_rmw_mod_reg_bits(bits, 0x0, module, idx);
71}
72
73
74/**
75 * omap2_prm_is_hardreset_asserted - read the HW reset line state of
76 * submodules contained in the hwmod module
77 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
78 * @shift: register bit shift corresponding to the reset line to check
79 *
80 * Returns 1 if the (sub)module hardreset line is currently asserted,
81 * 0 if the (sub)module hardreset line is not currently asserted, or
82 * -EINVAL if called while running on a non-OMAP2/3 chip.
83 */
84int omap2_prm_is_hardreset_asserted(s16 prm_mod, u8 shift)
85{
86 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
87 return -EINVAL;
88
89 return omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL,
90 (1 << shift));
91}
92
93/**
94 * omap2_prm_assert_hardreset - assert the HW reset line of a submodule
95 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
96 * @shift: register bit shift corresponding to the reset line to assert
97 *
98 * Some IPs like dsp or iva contain processors that require an HW
99 * reset line to be asserted / deasserted in order to fully enable the
100 * IP. These modules may have multiple hard-reset lines that reset
101 * different 'submodules' inside the IP block. This function will
102 * place the submodule into reset. Returns 0 upon success or -EINVAL
103 * upon an argument error.
104 */
105int omap2_prm_assert_hardreset(s16 prm_mod, u8 shift)
106{
107 u32 mask;
108
109 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
110 return -EINVAL;
111
112 mask = 1 << shift;
113 omap2_prm_rmw_mod_reg_bits(mask, mask, prm_mod, OMAP2_RM_RSTCTRL);
114
115 return 0;
116}
117
118/**
119 * omap2_prm_deassert_hardreset - deassert a submodule hardreset line and wait
120 * @prm_mod: PRM submodule base (e.g. CORE_MOD)
121 * @rst_shift: register bit shift corresponding to the reset line to deassert
122 * @st_shift: register bit shift for the status of the deasserted submodule
123 *
124 * Some IPs like dsp or iva contain processors that require an HW
125 * reset line to be asserted / deasserted in order to fully enable the
126 * IP. These modules may have multiple hard-reset lines that reset
127 * different 'submodules' inside the IP block. This function will
128 * take the submodule out of reset and wait until the PRCM indicates
129 * that the reset has completed before returning. Returns 0 upon success or
130 * -EINVAL upon an argument error, -EEXIST if the submodule was already out
131 * of reset, or -EBUSY if the submodule did not exit reset promptly.
132 */
133int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift)
134{
135 u32 rst, st;
136 int c;
137
138 if (!(cpu_is_omap24xx() || cpu_is_omap34xx()))
139 return -EINVAL;
140
141 rst = 1 << rst_shift;
142 st = 1 << st_shift;
143
144 /* Check the current status to avoid de-asserting the line twice */
145 if (omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTCTRL, rst) == 0)
146 return -EEXIST;
147
148 /* Clear the reset status by writing 1 to the status bit */
149 omap2_prm_rmw_mod_reg_bits(0xffffffff, st, prm_mod, OMAP2_RM_RSTST);
150 /* de-assert the reset control line */
151 omap2_prm_rmw_mod_reg_bits(rst, 0, prm_mod, OMAP2_RM_RSTCTRL);
152 /* wait the status to be set */
153 omap_test_timeout(omap2_prm_read_mod_bits_shift(prm_mod, OMAP2_RM_RSTST,
154 st),
155 MAX_MODULE_HARDRESET_WAIT, c);
156
157 return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
158}