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2ace831f PW |
1 | /* |
2 | * OMAP4 PRM instance functions | |
3 | * | |
4 | * Copyright (C) 2009 Nokia Corporation | |
eaac329d | 5 | * Copyright (C) 2011 Texas Instruments, Inc. |
2ace831f PW |
6 | * Paul Walmsley |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/io.h> | |
18 | ||
ee0839c2 | 19 | #include "iomap.h" |
4e65331c | 20 | #include "common.h" |
610eb8c2 | 21 | #include "prcm-common.h" |
2ace831f PW |
22 | #include "prm44xx.h" |
23 | #include "prminst44xx.h" | |
24 | #include "prm-regbits-44xx.h" | |
25 | #include "prcm44xx.h" | |
26 | #include "prcm_mpu44xx.h" | |
27 | ||
610eb8c2 S |
28 | static void __iomem *_prm_bases[OMAP4_MAX_PRCM_PARTITIONS]; |
29 | ||
30 | /** | |
31 | * omap_prm_base_init - Populates the prm partitions | |
32 | * | |
33 | * Populates the base addresses of the _prm_bases | |
34 | * array used for read/write of prm module registers. | |
35 | */ | |
36 | void omap_prm_base_init(void) | |
37 | { | |
38 | _prm_bases[OMAP4430_PRM_PARTITION] = prm_base; | |
39 | _prm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base; | |
40 | } | |
2ace831f PW |
41 | |
42 | /* Read a register in a PRM instance */ | |
43 | u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx) | |
44 | { | |
45 | BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS || | |
46 | part == OMAP4430_INVALID_PRCM_PARTITION || | |
47 | !_prm_bases[part]); | |
610eb8c2 | 48 | return __raw_readl(_prm_bases[part] + inst + idx); |
2ace831f PW |
49 | } |
50 | ||
51 | /* Write into a register in a PRM instance */ | |
52 | void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx) | |
53 | { | |
54 | BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS || | |
55 | part == OMAP4430_INVALID_PRCM_PARTITION || | |
56 | !_prm_bases[part]); | |
610eb8c2 | 57 | __raw_writel(val, _prm_bases[part] + inst + idx); |
2ace831f PW |
58 | } |
59 | ||
60 | /* Read-modify-write a register in PRM. Caller must lock */ | |
61 | u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst, | |
eaac329d | 62 | u16 idx) |
2ace831f PW |
63 | { |
64 | u32 v; | |
65 | ||
66 | v = omap4_prminst_read_inst_reg(part, inst, idx); | |
67 | v &= ~mask; | |
68 | v |= bits; | |
69 | omap4_prminst_write_inst_reg(v, part, inst, idx); | |
70 | ||
71 | return v; | |
72 | } | |
eaac329d BC |
73 | |
74 | /* | |
75 | * Address offset (in bytes) between the reset control and the reset | |
76 | * status registers: 4 bytes on OMAP4 | |
77 | */ | |
78 | #define OMAP4_RST_CTRL_ST_OFFSET 4 | |
79 | ||
80 | /** | |
81 | * omap4_prminst_is_hardreset_asserted - read the HW reset line state of | |
82 | * submodules contained in the hwmod module | |
83 | * @rstctrl_reg: RM_RSTCTRL register address for this module | |
84 | * @shift: register bit shift corresponding to the reset line to check | |
85 | * | |
86 | * Returns 1 if the (sub)module hardreset line is currently asserted, | |
87 | * 0 if the (sub)module hardreset line is not currently asserted, or | |
88 | * -EINVAL upon parameter error. | |
89 | */ | |
90 | int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst, | |
91 | u16 rstctrl_offs) | |
92 | { | |
93 | u32 v; | |
94 | ||
95 | v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs); | |
96 | v &= 1 << shift; | |
97 | v >>= shift; | |
98 | ||
99 | return v; | |
100 | } | |
101 | ||
102 | /** | |
103 | * omap4_prminst_assert_hardreset - assert the HW reset line of a submodule | |
104 | * @rstctrl_reg: RM_RSTCTRL register address for this module | |
105 | * @shift: register bit shift corresponding to the reset line to assert | |
106 | * | |
107 | * Some IPs like dsp, ipu or iva contain processors that require an HW | |
108 | * reset line to be asserted / deasserted in order to fully enable the | |
109 | * IP. These modules may have multiple hard-reset lines that reset | |
110 | * different 'submodules' inside the IP block. This function will | |
111 | * place the submodule into reset. Returns 0 upon success or -EINVAL | |
112 | * upon an argument error. | |
113 | */ | |
114 | int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst, | |
115 | u16 rstctrl_offs) | |
116 | { | |
117 | u32 mask = 1 << shift; | |
118 | ||
119 | omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | /** | |
125 | * omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and | |
126 | * wait | |
127 | * @rstctrl_reg: RM_RSTCTRL register address for this module | |
128 | * @shift: register bit shift corresponding to the reset line to deassert | |
129 | * | |
130 | * Some IPs like dsp, ipu or iva contain processors that require an HW | |
131 | * reset line to be asserted / deasserted in order to fully enable the | |
132 | * IP. These modules may have multiple hard-reset lines that reset | |
133 | * different 'submodules' inside the IP block. This function will | |
134 | * take the submodule out of reset and wait until the PRCM indicates | |
135 | * that the reset has completed before returning. Returns 0 upon success or | |
136 | * -EINVAL upon an argument error, -EEXIST if the submodule was already out | |
137 | * of reset, or -EBUSY if the submodule did not exit reset promptly. | |
138 | */ | |
139 | int omap4_prminst_deassert_hardreset(u8 shift, u8 part, s16 inst, | |
140 | u16 rstctrl_offs) | |
141 | { | |
142 | int c; | |
143 | u32 mask = 1 << shift; | |
144 | u16 rstst_offs = rstctrl_offs + OMAP4_RST_CTRL_ST_OFFSET; | |
145 | ||
146 | /* Check the current status to avoid de-asserting the line twice */ | |
147 | if (omap4_prminst_is_hardreset_asserted(shift, part, inst, | |
148 | rstctrl_offs) == 0) | |
149 | return -EEXIST; | |
150 | ||
151 | /* Clear the reset status by writing 1 to the status bit */ | |
152 | omap4_prminst_rmw_inst_reg_bits(0xffffffff, mask, part, inst, | |
153 | rstst_offs); | |
154 | /* de-assert the reset control line */ | |
155 | omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs); | |
156 | /* wait the status to be set */ | |
157 | omap_test_timeout(omap4_prminst_is_hardreset_asserted(shift, part, inst, | |
158 | rstst_offs), | |
159 | MAX_MODULE_HARDRESET_WAIT, c); | |
160 | ||
161 | return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0; | |
162 | } | |
e54433f1 BC |
163 | |
164 | ||
165 | void omap4_prminst_global_warm_sw_reset(void) | |
166 | { | |
167 | u32 v; | |
168 | ||
169 | v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, | |
170 | OMAP4430_PRM_DEVICE_INST, | |
171 | OMAP4_PRM_RSTCTRL_OFFSET); | |
172 | v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK; | |
173 | omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION, | |
174 | OMAP4430_PRM_DEVICE_INST, | |
175 | OMAP4_PRM_RSTCTRL_OFFSET); | |
176 | ||
177 | /* OCP barrier */ | |
178 | v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, | |
179 | OMAP4430_PRM_DEVICE_INST, | |
180 | OMAP4_PRM_RSTCTRL_OFFSET); | |
181 | } |