1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * OMAP4 PRM instance functions
4 *
5 * Copyright (C) 2009 Nokia Corporation
6 * Copyright (C) 2011 Texas Instruments, Inc.
7 * Paul Walmsley
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/types.h>
12 #include <linux/errno.h>
13 #include <linux/err.h>
14 #include <linux/io.h>
15
16 #include "iomap.h"
17 #include "common.h"
18 #include "prcm-common.h"
19 #include "prm44xx.h"
20 #include "prm54xx.h"
21 #include "prm7xx.h"
22 #include "prminst44xx.h"
23 #include "prm-regbits-44xx.h"
24 #include "prcm44xx.h"
25 #include "prcm43xx.h"
26 #include "prcm_mpu44xx.h"
27 #include "soc.h"
28
29 static struct omap_domain_base _prm_bases[OMAP4_MAX_PRCM_PARTITIONS];
30
31 static s32 prm_dev_inst = PRM_INSTANCE_UNKNOWN;
32
33 /**
34 * omap_prm_base_init - Populates the prm partitions
35 *
36 * Populates the base addresses of the _prm_bases
37 * array used for read/write of prm module registers.
38 */
39 void omap_prm_base_init(void)
40 {
41 memcpy(&_prm_bases[OMAP4430_PRM_PARTITION], &prm_base,
42 sizeof(prm_base));
43 memcpy(&_prm_bases[OMAP4430_PRCM_MPU_PARTITION], &prcm_mpu_base,
44 sizeof(prcm_mpu_base));
45 }
46
47 s32 omap4_prmst_get_prm_dev_inst(void)
48 {
49 return prm_dev_inst;
50 }
51
52 void omap4_prminst_set_prm_dev_inst(s32 dev_inst)
53 {
54 prm_dev_inst = dev_inst;
55 }
56
57 /* Read a register in a PRM instance */
58 u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
59 {
60 BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
61 part == OMAP4430_INVALID_PRCM_PARTITION ||
62 !_prm_bases[part].va);
63 return readl_relaxed(_prm_bases[part].va + inst + idx);
64 }
65
66 /* Write into a register in a PRM instance */
67 void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
68 {
69 BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
70 part == OMAP4430_INVALID_PRCM_PARTITION ||
71 !_prm_bases[part].va);
72 writel_relaxed(val, _prm_bases[part].va + inst + idx);
73 }
74
75 /* Read-modify-write a register in PRM. Caller must lock */
76 u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
77 u16 idx)
78 {
79 u32 v;
80
81 v = omap4_prminst_read_inst_reg(part, inst, idx);
82 v &= ~mask;
83 v |= bits;
84 omap4_prminst_write_inst_reg(v, part, inst, idx);
85
86 return v;
87 }
88
89 /**
90 * omap4_prminst_is_hardreset_asserted - read the HW reset line state of
91 * submodules contained in the hwmod module
92 * @rstctrl_reg: RM_RSTCTRL register address for this module
93 * @shift: register bit shift corresponding to the reset line to check
94 *
95 * Returns 1 if the (sub)module hardreset line is currently asserted,
96 * 0 if the (sub)module hardreset line is not currently asserted, or
97 * -EINVAL upon parameter error.
98 */
99 int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
100 u16 rstctrl_offs)
101 {
102 u32 v;
103
104 v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
105 v &= 1 << shift;
106 v >>= shift;
107
108 return v;
109 }
110
111 /**
112 * omap4_prminst_assert_hardreset - assert the HW reset line of a submodule
113 * @rstctrl_reg: RM_RSTCTRL register address for this module
114 * @shift: register bit shift corresponding to the reset line to assert
115 *
116 * Some IPs like dsp, ipu or iva contain processors that require an HW
117 * reset line to be asserted / deasserted in order to fully enable the
118 * IP. These modules may have multiple hard-reset lines that reset
119 * different 'submodules' inside the IP block. This function will
120 * place the submodule into reset. Returns 0 upon success or -EINVAL
121 * upon an argument error.
122 */
123 int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
124 u16 rstctrl_offs)
125 {
126 u32 mask = 1 << shift;
127
128 omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs);
129
130 return 0;
131 }
132
133 /**
134 * omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and
135 * wait
136 * @shift: register bit shift corresponding to the reset line to deassert
137 * @st_shift: status bit offset corresponding to the reset line
138 * @part: PRM partition
139 * @inst: PRM instance offset
140 * @rstctrl_offs: reset register offset
141 * @rstst_offs: reset status register offset
142 *
143 * Some IPs like dsp, ipu or iva contain processors that require an HW
144 * reset line to be asserted / deasserted in order to fully enable the
145 * IP. These modules may have multiple hard-reset lines that reset
146 * different 'submodules' inside the IP block. This function will
147 * take the submodule out of reset and wait until the PRCM indicates
148 * that the reset has completed before returning. Returns 0 upon success or
149 * -EINVAL upon an argument error, -EEXIST if the submodule was already out
150 * of reset, or -EBUSY if the submodule did not exit reset promptly.
151 */
152 int omap4_prminst_deassert_hardreset(u8 shift, u8 st_shift, u8 part, s16 inst,
153 u16 rstctrl_offs, u16 rstst_offs)
154 {
155 int c;
156 u32 mask = 1 << shift;
157 u32 st_mask = 1 << st_shift;
158
159 /* Check the current status to avoid de-asserting the line twice */
160 if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
161 rstctrl_offs) == 0)
162 return -EEXIST;
163
164 /* Clear the reset status by writing 1 to the status bit */
165 omap4_prminst_rmw_inst_reg_bits(0xffffffff, st_mask, part, inst,
166 rstst_offs);
167 /* de-assert the reset control line */
168 omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs);
169 /* wait the status to be set */
170 omap_test_timeout(omap4_prminst_is_hardreset_asserted(st_shift, part,
171 inst, rstst_offs),
172 MAX_MODULE_HARDRESET_WAIT, c);
173
174 return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
175 }
176
177
178 void omap4_prminst_global_warm_sw_reset(void)
179 {
180 u32 v;
181 s32 inst = omap4_prmst_get_prm_dev_inst();
182
183 if (inst == PRM_INSTANCE_UNKNOWN)
184 return;
185
186 v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, inst,
187 OMAP4_PRM_RSTCTRL_OFFSET);
188 v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
189 omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION,
190 inst, OMAP4_PRM_RSTCTRL_OFFSET);
191
192 /* OCP barrier */
193 v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
194 inst, OMAP4_PRM_RSTCTRL_OFFSET);
195 }
196
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