1 /*
2 * OMAP4 PRM module functions
3 *
4 * Copyright (C) 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/delay.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/io.h>
19
20 #include <plat/cpu.h>
21 #include <plat/irqs.h>
22 #include <plat/prcm.h>
23
24 #include "iomap.h"
25 #include "common.h"
26 #include "vp.h"
27 #include "prm44xx.h"
28 #include "prm-regbits-44xx.h"
29 #include "prcm44xx.h"
30 #include "prminst44xx.h"
31
32 static const struct omap_prcm_irq omap4_prcm_irqs[] = {
33 OMAP_PRCM_IRQ("wkup", 0, 0),
34 OMAP_PRCM_IRQ("io", 9, 1),
35 };
36
37 static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
38 .ack = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
39 .mask = OMAP4_PRM_IRQENABLE_MPU_OFFSET,
40 .nr_regs = 2,
41 .irqs = omap4_prcm_irqs,
42 .nr_irqs = ARRAY_SIZE(omap4_prcm_irqs),
43 .irq = OMAP44XX_IRQ_PRCM,
44 .read_pending_irqs = &omap44xx_prm_read_pending_irqs,
45 .ocp_barrier = &omap44xx_prm_ocp_barrier,
46 .save_and_clear_irqen = &omap44xx_prm_save_and_clear_irqen,
47 .restore_irqen = &omap44xx_prm_restore_irqen,
48 };
49
50 /* PRM low-level functions */
51
52 /* Read a register in a CM/PRM instance in the PRM module */
omap4_prm_read_inst_reg(s16 inst,u16 reg)53 u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
54 {
55 return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
56 }
57
58 /* Write into a register in a CM/PRM instance in the PRM module */
omap4_prm_write_inst_reg(u32 val,s16 inst,u16 reg)59 void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
60 {
61 __raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
62 }
63
64 /* Read-modify-write a register in a PRM module. Caller must lock */
omap4_prm_rmw_inst_reg_bits(u32 mask,u32 bits,s16 inst,s16 reg)65 u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
66 {
67 u32 v;
68
69 v = omap4_prm_read_inst_reg(inst, reg);
70 v &= ~mask;
71 v |= bits;
72 omap4_prm_write_inst_reg(v, inst, reg);
73
74 return v;
75 }
76
77 /* PRM VP */
78
79 /*
80 * struct omap4_vp - OMAP4 VP register access description.
81 * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
82 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
83 */
84 struct omap4_vp {
85 u32 irqstatus_mpu;
86 u32 tranxdone_status;
87 };
88
89 static struct omap4_vp omap4_vp[] = {
90 [OMAP4_VP_VDD_MPU_ID] = {
91 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
92 .tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
93 },
94 [OMAP4_VP_VDD_IVA_ID] = {
95 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
96 .tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
97 },
98 [OMAP4_VP_VDD_CORE_ID] = {
99 .irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
100 .tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
101 },
102 };
103
omap4_prm_vp_check_txdone(u8 vp_id)104 u32 omap4_prm_vp_check_txdone(u8 vp_id)
105 {
106 struct omap4_vp *vp = &omap4_vp[vp_id];
107 u32 irqstatus;
108
109 irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
110 OMAP4430_PRM_OCP_SOCKET_INST,
111 vp->irqstatus_mpu);
112 return irqstatus & vp->tranxdone_status;
113 }
114
omap4_prm_vp_clear_txdone(u8 vp_id)115 void omap4_prm_vp_clear_txdone(u8 vp_id)
116 {
117 struct omap4_vp *vp = &omap4_vp[vp_id];
118
119 omap4_prminst_write_inst_reg(vp->tranxdone_status,
120 OMAP4430_PRM_PARTITION,
121 OMAP4430_PRM_OCP_SOCKET_INST,
122 vp->irqstatus_mpu);
123 };
124
omap4_prm_vcvp_read(u8 offset)125 u32 omap4_prm_vcvp_read(u8 offset)
126 {
127 return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
128 OMAP4430_PRM_DEVICE_INST, offset);
129 }
130
omap4_prm_vcvp_write(u32 val,u8 offset)131 void omap4_prm_vcvp_write(u32 val, u8 offset)
132 {
133 omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
134 OMAP4430_PRM_DEVICE_INST, offset);
135 }
136
omap4_prm_vcvp_rmw(u32 mask,u32 bits,u8 offset)137 u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
138 {
139 return omap4_prminst_rmw_inst_reg_bits(mask, bits,
140 OMAP4430_PRM_PARTITION,
141 OMAP4430_PRM_DEVICE_INST,
142 offset);
143 }
144
_read_pending_irq_reg(u16 irqen_offs,u16 irqst_offs)145 static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
146 {
147 u32 mask, st;
148
149 /* XXX read mask from RAM? */
150 mask = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
151 irqen_offs);
152 st = omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST, irqst_offs);
153
154 return mask & st;
155 }
156
157 /**
158 * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
159 * @events: ptr to two consecutive u32s, preallocated by caller
160 *
161 * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
162 * MPU IRQs, and store the result into the two u32s pointed to by @events.
163 * No return value.
164 */
omap44xx_prm_read_pending_irqs(unsigned long * events)165 void omap44xx_prm_read_pending_irqs(unsigned long *events)
166 {
167 events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET,
168 OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
169
170 events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET,
171 OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
172 }
173
174 /**
175 * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
176 *
177 * Force any buffered writes to the PRM IP block to complete. Needed
178 * by the PRM IRQ handler, which reads and writes directly to the IP
179 * block, to avoid race conditions after acknowledging or clearing IRQ
180 * bits. No return value.
181 */
omap44xx_prm_ocp_barrier(void)182 void omap44xx_prm_ocp_barrier(void)
183 {
184 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
185 OMAP4_REVISION_PRM_OFFSET);
186 }
187
188 /**
189 * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
190 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
191 *
192 * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
193 * @saved_mask. @saved_mask must be allocated by the caller.
194 * Intended to be used in the PRM interrupt handler suspend callback.
195 * The OCP barrier is needed to ensure the write to disable PRM
196 * interrupts reaches the PRM before returning; otherwise, spurious
197 * interrupts might occur. No return value.
198 */
omap44xx_prm_save_and_clear_irqen(u32 * saved_mask)199 void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
200 {
201 saved_mask[0] =
202 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
203 OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
204 saved_mask[1] =
205 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
206 OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
207
208 omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
209 OMAP4_PRM_IRQENABLE_MPU_OFFSET);
210 omap4_prm_write_inst_reg(0, OMAP4430_PRM_OCP_SOCKET_INST,
211 OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
212
213 /* OCP barrier */
214 omap4_prm_read_inst_reg(OMAP4430_PRM_OCP_SOCKET_INST,
215 OMAP4_REVISION_PRM_OFFSET);
216 }
217
218 /**
219 * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
220 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
221 *
222 * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
223 * @saved_mask. Intended to be used in the PRM interrupt handler resume
224 * callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
225 * No OCP barrier should be needed here; any pending PRM interrupts will fire
226 * once the writes reach the PRM. No return value.
227 */
omap44xx_prm_restore_irqen(u32 * saved_mask)228 void omap44xx_prm_restore_irqen(u32 *saved_mask)
229 {
230 omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_OCP_SOCKET_INST,
231 OMAP4_PRM_IRQENABLE_MPU_OFFSET);
232 omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_OCP_SOCKET_INST,
233 OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
234 }
235
omap4xxx_prcm_init(void)236 static int __init omap4xxx_prcm_init(void)
237 {
238 if (cpu_is_omap44xx())
239 return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
240 return 0;
241 }
242 subsys_initcall(omap4xxx_prcm_init);
243