John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify it |
| 3 | * under the terms of the GNU General Public License version 2 as published |
| 4 | * by the Free Software Foundation. |
| 5 | * |
| 6 | * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com> |
John Crispin | 97b9210 | 2016-05-05 09:57:56 +0200 | [diff] [blame] | 7 | * Copyright (C) 2010 John Crispin <john@phrozen.org> |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 8 | */ |
| 9 | #include <linux/io.h> |
John Crispin | 4af92e7 | 2011-11-10 21:33:07 +0100 | [diff] [blame] | 10 | #include <linux/export.h> |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/clk.h> |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 15 | #include <linux/clkdev.h> |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 16 | #include <linux/err.h> |
| 17 | #include <linux/list.h> |
| 18 | |
| 19 | #include <asm/time.h> |
| 20 | #include <asm/irq.h> |
| 21 | #include <asm/div64.h> |
| 22 | |
| 23 | #include <lantiq_soc.h> |
| 24 | |
| 25 | #include "clk.h" |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 26 | #include "prom.h" |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 27 | |
| 28 | /* lantiq socs have 3 static clocks */ |
John Crispin | 740c606e | 2013-01-19 08:54:24 +0000 | [diff] [blame] | 29 | static struct clk cpu_clk_generic[4]; |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 30 | |
John Crispin | 740c606e | 2013-01-19 08:54:24 +0000 | [diff] [blame] | 31 | void clkdev_add_static(unsigned long cpu, unsigned long fpi, |
| 32 | unsigned long io, unsigned long ppe) |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 33 | { |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 34 | cpu_clk_generic[0].rate = cpu; |
| 35 | cpu_clk_generic[1].rate = fpi; |
| 36 | cpu_clk_generic[2].rate = io; |
John Crispin | 740c606e | 2013-01-19 08:54:24 +0000 | [diff] [blame] | 37 | cpu_clk_generic[3].rate = ppe; |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | struct clk *clk_get_cpu(void) |
| 41 | { |
| 42 | return &cpu_clk_generic[0]; |
| 43 | } |
| 44 | |
| 45 | struct clk *clk_get_fpi(void) |
| 46 | { |
| 47 | return &cpu_clk_generic[1]; |
| 48 | } |
| 49 | EXPORT_SYMBOL_GPL(clk_get_fpi); |
| 50 | |
| 51 | struct clk *clk_get_io(void) |
| 52 | { |
| 53 | return &cpu_clk_generic[2]; |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 54 | } |
| 55 | |
John Crispin | 740c606e | 2013-01-19 08:54:24 +0000 | [diff] [blame] | 56 | struct clk *clk_get_ppe(void) |
| 57 | { |
| 58 | return &cpu_clk_generic[3]; |
| 59 | } |
| 60 | EXPORT_SYMBOL_GPL(clk_get_ppe); |
| 61 | |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 62 | static inline int clk_good(struct clk *clk) |
| 63 | { |
| 64 | return clk && !IS_ERR(clk); |
| 65 | } |
| 66 | |
| 67 | unsigned long clk_get_rate(struct clk *clk) |
| 68 | { |
| 69 | if (unlikely(!clk_good(clk))) |
| 70 | return 0; |
| 71 | |
| 72 | if (clk->rate != 0) |
| 73 | return clk->rate; |
| 74 | |
| 75 | if (clk->get_rate != NULL) |
| 76 | return clk->get_rate(); |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | EXPORT_SYMBOL(clk_get_rate); |
| 81 | |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 82 | int clk_set_rate(struct clk *clk, unsigned long rate) |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 83 | { |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 84 | if (unlikely(!clk_good(clk))) |
| 85 | return 0; |
| 86 | if (clk->rates && *clk->rates) { |
| 87 | unsigned long *r = clk->rates; |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 88 | |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 89 | while (*r && (*r != rate)) |
| 90 | r++; |
| 91 | if (!*r) { |
| 92 | pr_err("clk %s.%s: trying to set invalid rate %ld\n", |
| 93 | clk->cl.dev_id, clk->cl.con_id, rate); |
| 94 | return -1; |
| 95 | } |
| 96 | } |
| 97 | clk->rate = rate; |
| 98 | return 0; |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 99 | } |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 100 | EXPORT_SYMBOL(clk_set_rate); |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 101 | |
Hauke Mehrtens | 500fab9 | 2015-10-25 23:21:42 +0100 | [diff] [blame] | 102 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 103 | { |
| 104 | if (unlikely(!clk_good(clk))) |
| 105 | return 0; |
| 106 | if (clk->rates && *clk->rates) { |
| 107 | unsigned long *r = clk->rates; |
| 108 | |
| 109 | while (*r && (*r != rate)) |
| 110 | r++; |
| 111 | if (!*r) { |
| 112 | return clk->rate; |
| 113 | } |
| 114 | } |
| 115 | return rate; |
| 116 | } |
| 117 | EXPORT_SYMBOL(clk_round_rate); |
| 118 | |
John Crispin | 744120a | 2011-06-09 20:15:21 +0200 | [diff] [blame] | 119 | int clk_enable(struct clk *clk) |
| 120 | { |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 121 | if (unlikely(!clk_good(clk))) |
| 122 | return -1; |
| 123 | |
| 124 | if (clk->enable) |
| 125 | return clk->enable(clk); |
| 126 | |
| 127 | return -1; |
John Crispin | 744120a | 2011-06-09 20:15:21 +0200 | [diff] [blame] | 128 | } |
| 129 | EXPORT_SYMBOL(clk_enable); |
| 130 | |
| 131 | void clk_disable(struct clk *clk) |
| 132 | { |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 133 | if (unlikely(!clk_good(clk))) |
| 134 | return; |
| 135 | |
| 136 | if (clk->disable) |
| 137 | clk->disable(clk); |
John Crispin | 744120a | 2011-06-09 20:15:21 +0200 | [diff] [blame] | 138 | } |
| 139 | EXPORT_SYMBOL(clk_disable); |
| 140 | |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 141 | int clk_activate(struct clk *clk) |
| 142 | { |
| 143 | if (unlikely(!clk_good(clk))) |
| 144 | return -1; |
| 145 | |
| 146 | if (clk->activate) |
| 147 | return clk->activate(clk); |
| 148 | |
| 149 | return -1; |
| 150 | } |
| 151 | EXPORT_SYMBOL(clk_activate); |
| 152 | |
| 153 | void clk_deactivate(struct clk *clk) |
| 154 | { |
| 155 | if (unlikely(!clk_good(clk))) |
| 156 | return; |
| 157 | |
| 158 | if (clk->deactivate) |
| 159 | clk->deactivate(clk); |
| 160 | } |
| 161 | EXPORT_SYMBOL(clk_deactivate); |
| 162 | |
John Crispin | b902d9a | 2012-07-22 08:56:01 +0200 | [diff] [blame] | 163 | struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec) |
| 164 | { |
| 165 | return NULL; |
| 166 | } |
| 167 | |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 168 | static inline u32 get_counter_resolution(void) |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 169 | { |
| 170 | u32 res; |
| 171 | |
| 172 | __asm__ __volatile__( |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 173 | ".set push\n" |
| 174 | ".set mips32r2\n" |
| 175 | "rdhwr %0, $3\n" |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 176 | ".set pop\n" |
| 177 | : "=&r" (res) |
| 178 | : /* no input */ |
| 179 | : "memory"); |
| 180 | |
| 181 | return res; |
| 182 | } |
| 183 | |
| 184 | void __init plat_time_init(void) |
| 185 | { |
| 186 | struct clk *clk; |
| 187 | |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 188 | ltq_soc_init(); |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 189 | |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 190 | clk = clk_get_cpu(); |
| 191 | mips_hpt_frequency = clk_get_rate(clk) / get_counter_resolution(); |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 192 | write_c0_compare(read_c0_count()); |
John Crispin | 287e3f3 | 2012-04-17 15:53:19 +0200 | [diff] [blame] | 193 | pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000); |
John Crispin | 171bb2f | 2011-03-30 09:27:47 +0200 | [diff] [blame] | 194 | clk_put(clk); |
| 195 | } |