1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-omap2/clock.c
4 *
5 * Copyright (C) 2005-2008 Texas Instruments, Inc.
6 * Copyright (C) 2004-2010 Nokia Corporation
7 *
8 * Contacts:
9 * Richard Woodruff <r-woodruff2@ti.com>
10 * Paul Walmsley
11 */
12 #undef DEBUG
13
14 #include <linux/kernel.h>
15 #include <linux/export.h>
16 #include <linux/list.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/delay.h>
20 #include <linux/clk.h>
21 #include <linux/clk-provider.h>
22 #include <linux/io.h>
23 #include <linux/bitops.h>
24 #include <linux/of_address.h>
25 #include <asm/cpu.h>
26
27 #include <trace/events/power.h>
28
29 #include "soc.h"
30 #include "clockdomain.h"
31 #include "clock.h"
32 #include "cm.h"
33 #include "cm2xxx.h"
34 #include "cm3xxx.h"
35 #include "cm-regbits-24xx.h"
36 #include "cm-regbits-34xx.h"
37 #include "common.h"
38
39 /* DPLL valid Fint frequency band limits - from 34xx TRM Section 4.7.6.2 */
40 #define OMAP3430_DPLL_FINT_BAND1_MIN 750000
41 #define OMAP3430_DPLL_FINT_BAND1_MAX 2100000
42 #define OMAP3430_DPLL_FINT_BAND2_MIN 7500000
43 #define OMAP3430_DPLL_FINT_BAND2_MAX 21000000
44
45 /*
46 * DPLL valid Fint frequency range for OMAP36xx and OMAP4xxx.
47 * From device data manual section 4.3 "DPLL and DLL Specifications".
48 */
49 #define OMAP3PLUS_DPLL_FINT_MIN 32000
50 #define OMAP3PLUS_DPLL_FINT_MAX 52000000
51
52 struct ti_clk_ll_ops omap_clk_ll_ops = {
53 .clkdm_clk_enable = clkdm_clk_enable,
54 .clkdm_clk_disable = clkdm_clk_disable,
55 .clkdm_lookup = clkdm_lookup,
56 .cm_wait_module_ready = omap_cm_wait_module_ready,
57 .cm_split_idlest_reg = cm_split_idlest_reg,
58 };
59
60 /**
61 * omap2_clk_setup_ll_ops - setup clock driver low-level ops
62 *
63 * Sets up clock driver low-level platform ops. These are needed
64 * for register accesses and various other misc platform operations.
65 * Returns 0 on success, -EBUSY if low level ops have been registered
66 * already.
67 */
68 int __init omap2_clk_setup_ll_ops(void)
69 {
70 return ti_clk_setup_ll_ops(&omap_clk_ll_ops);
71 }
72
73 /*
74 * OMAP2+ specific clock functions
75 */
76
77 /**
78 * ti_clk_init_features - init clock features struct for the SoC
79 *
80 * Initializes the clock features struct based on the SoC type.
81 */
82 void __init ti_clk_init_features(void)
83 {
84 struct ti_clk_features features = { 0 };
85 /* Fint setup for DPLLs */
86 if (cpu_is_omap3430()) {
87 features.fint_min = OMAP3430_DPLL_FINT_BAND1_MIN;
88 features.fint_max = OMAP3430_DPLL_FINT_BAND2_MAX;
89 features.fint_band1_max = OMAP3430_DPLL_FINT_BAND1_MAX;
90 features.fint_band2_min = OMAP3430_DPLL_FINT_BAND2_MIN;
91 } else {
92 features.fint_min = OMAP3PLUS_DPLL_FINT_MIN;
93 features.fint_max = OMAP3PLUS_DPLL_FINT_MAX;
94 }
95
96 /* Bypass value setup for DPLLs */
97 if (cpu_is_omap24xx()) {
98 features.dpll_bypass_vals |=
99 (1 << OMAP2XXX_EN_DPLL_LPBYPASS) |
100 (1 << OMAP2XXX_EN_DPLL_FRBYPASS);
101 } else if (cpu_is_omap34xx()) {
102 features.dpll_bypass_vals |=
103 (1 << OMAP3XXX_EN_DPLL_LPBYPASS) |
104 (1 << OMAP3XXX_EN_DPLL_FRBYPASS);
105 } else if (soc_is_am33xx() || cpu_is_omap44xx() || soc_is_am43xx() ||
106 soc_is_omap54xx() || soc_is_dra7xx()) {
107 features.dpll_bypass_vals |=
108 (1 << OMAP4XXX_EN_DPLL_LPBYPASS) |
109 (1 << OMAP4XXX_EN_DPLL_FRBYPASS) |
110 (1 << OMAP4XXX_EN_DPLL_MNBYPASS);
111 }
112
113 /* Jitter correction only available on OMAP343X */
114 if (cpu_is_omap343x())
115 features.flags |= TI_CLK_DPLL_HAS_FREQSEL;
116
117 if (omap_type() == OMAP2_DEVICE_TYPE_GP)
118 features.flags |= TI_CLK_DEVICE_TYPE_GP;
119
120 /* Idlest value for interface clocks.
121 * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
122 * 34xx reverses this, just to keep us on our toes
123 * AM35xx uses both, depending on the module.
124 */
125 if (cpu_is_omap24xx())
126 features.cm_idlest_val = OMAP24XX_CM_IDLEST_VAL;
127 else if (cpu_is_omap34xx())
128 features.cm_idlest_val = OMAP34XX_CM_IDLEST_VAL;
129
130 /* On OMAP3430 ES1.0, DPLL4 can't be re-programmed */
131 if (omap_rev() == OMAP3430_REV_ES1_0)
132 features.flags |= TI_CLK_DPLL4_DENY_REPROGRAM;
133
134 /* Errata I810 for omap5 / dra7 */
135 if (soc_is_omap54xx() || soc_is_dra7xx())
136 features.flags |= TI_CLK_ERRATA_I810;
137
138 ti_clk_setup_features(&features);
139 }
140
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