Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Clock management for AT32AP CPUs |
| 3 | * |
| 4 | * Copyright (C) 2006 Atmel Corporation |
| 5 | * |
Andrew Victor | 9d04126 | 2007-02-05 11:42:07 +0100 | [diff] [blame] | 6 | * Based on arch/arm/mach-at91/clock.c |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 7 | * Copyright (C) 2005 David Brownell |
| 8 | * Copyright (C) 2005 Ivan Kokshaysky |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | #include <linux/clk.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/string.h> |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 18 | #include <linux/list.h> |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 19 | |
Haavard Skinnemoen | a8d902d | 2008-07-31 16:06:58 +0200 | [diff] [blame] | 20 | #include <mach/chip.h> |
| 21 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 22 | #include "clock.h" |
| 23 | |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 24 | /* at32 clock list */ |
| 25 | static LIST_HEAD(at32_clock_list); |
| 26 | |
Thomas Gleixner | e89b064 | 2007-04-29 16:10:34 +0000 | [diff] [blame] | 27 | static DEFINE_SPINLOCK(clk_lock); |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 28 | static DEFINE_SPINLOCK(clk_list_lock); |
| 29 | |
| 30 | void at32_clk_register(struct clk *clk) |
| 31 | { |
| 32 | spin_lock(&clk_list_lock); |
| 33 | /* add the new item to the end of the list */ |
| 34 | list_add_tail(&clk->list, &at32_clock_list); |
| 35 | spin_unlock(&clk_list_lock); |
| 36 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 37 | |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 38 | static struct clk *__clk_get(struct device *dev, const char *id) |
| 39 | { |
| 40 | struct clk *clk; |
| 41 | |
| 42 | list_for_each_entry(clk, &at32_clock_list, list) { |
| 43 | if (clk->dev == dev && strcmp(id, clk->name) == 0) { |
| 44 | return clk; |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | return ERR_PTR(-ENOENT); |
| 49 | } |
| 50 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 51 | struct clk *clk_get(struct device *dev, const char *id) |
| 52 | { |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 53 | struct clk *clk; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 54 | |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 55 | spin_lock(&clk_list_lock); |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 56 | clk = __clk_get(dev, id); |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 57 | spin_unlock(&clk_list_lock); |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 58 | |
| 59 | return clk; |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 60 | } |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 61 | |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 62 | EXPORT_SYMBOL(clk_get); |
| 63 | |
| 64 | void clk_put(struct clk *clk) |
| 65 | { |
| 66 | /* clocks are static for now, we can't free them */ |
| 67 | } |
| 68 | EXPORT_SYMBOL(clk_put); |
| 69 | |
| 70 | static void __clk_enable(struct clk *clk) |
| 71 | { |
| 72 | if (clk->parent) |
| 73 | __clk_enable(clk->parent); |
| 74 | if (clk->users++ == 0 && clk->mode) |
| 75 | clk->mode(clk, 1); |
| 76 | } |
| 77 | |
| 78 | int clk_enable(struct clk *clk) |
| 79 | { |
| 80 | unsigned long flags; |
| 81 | |
| 82 | spin_lock_irqsave(&clk_lock, flags); |
| 83 | __clk_enable(clk); |
| 84 | spin_unlock_irqrestore(&clk_lock, flags); |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | EXPORT_SYMBOL(clk_enable); |
| 89 | |
| 90 | static void __clk_disable(struct clk *clk) |
| 91 | { |
Haavard Skinnemoen | 23cebe2 | 2007-02-16 13:19:47 +0100 | [diff] [blame] | 92 | if (clk->users == 0) { |
| 93 | printk(KERN_ERR "%s: mismatched disable\n", clk->name); |
| 94 | WARN_ON(1); |
| 95 | return; |
| 96 | } |
Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 97 | |
| 98 | if (--clk->users == 0 && clk->mode) |
| 99 | clk->mode(clk, 0); |
| 100 | if (clk->parent) |
| 101 | __clk_disable(clk->parent); |
| 102 | } |
| 103 | |
| 104 | void clk_disable(struct clk *clk) |
| 105 | { |
| 106 | unsigned long flags; |
| 107 | |
| 108 | spin_lock_irqsave(&clk_lock, flags); |
| 109 | __clk_disable(clk); |
| 110 | spin_unlock_irqrestore(&clk_lock, flags); |
| 111 | } |
| 112 | EXPORT_SYMBOL(clk_disable); |
| 113 | |
| 114 | unsigned long clk_get_rate(struct clk *clk) |
| 115 | { |
| 116 | unsigned long flags; |
| 117 | unsigned long rate; |
| 118 | |
| 119 | spin_lock_irqsave(&clk_lock, flags); |
| 120 | rate = clk->get_rate(clk); |
| 121 | spin_unlock_irqrestore(&clk_lock, flags); |
| 122 | |
| 123 | return rate; |
| 124 | } |
| 125 | EXPORT_SYMBOL(clk_get_rate); |
| 126 | |
| 127 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 128 | { |
| 129 | unsigned long flags, actual_rate; |
| 130 | |
| 131 | if (!clk->set_rate) |
| 132 | return -ENOSYS; |
| 133 | |
| 134 | spin_lock_irqsave(&clk_lock, flags); |
| 135 | actual_rate = clk->set_rate(clk, rate, 0); |
| 136 | spin_unlock_irqrestore(&clk_lock, flags); |
| 137 | |
| 138 | return actual_rate; |
| 139 | } |
| 140 | EXPORT_SYMBOL(clk_round_rate); |
| 141 | |
| 142 | int clk_set_rate(struct clk *clk, unsigned long rate) |
| 143 | { |
| 144 | unsigned long flags; |
| 145 | long ret; |
| 146 | |
| 147 | if (!clk->set_rate) |
| 148 | return -ENOSYS; |
| 149 | |
| 150 | spin_lock_irqsave(&clk_lock, flags); |
| 151 | ret = clk->set_rate(clk, rate, 1); |
| 152 | spin_unlock_irqrestore(&clk_lock, flags); |
| 153 | |
| 154 | return (ret < 0) ? ret : 0; |
| 155 | } |
| 156 | EXPORT_SYMBOL(clk_set_rate); |
| 157 | |
| 158 | int clk_set_parent(struct clk *clk, struct clk *parent) |
| 159 | { |
| 160 | unsigned long flags; |
| 161 | int ret; |
| 162 | |
| 163 | if (!clk->set_parent) |
| 164 | return -ENOSYS; |
| 165 | |
| 166 | spin_lock_irqsave(&clk_lock, flags); |
| 167 | ret = clk->set_parent(clk, parent); |
| 168 | spin_unlock_irqrestore(&clk_lock, flags); |
| 169 | |
| 170 | return ret; |
| 171 | } |
| 172 | EXPORT_SYMBOL(clk_set_parent); |
| 173 | |
| 174 | struct clk *clk_get_parent(struct clk *clk) |
| 175 | { |
| 176 | return clk->parent; |
| 177 | } |
| 178 | EXPORT_SYMBOL(clk_get_parent); |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 179 | |
| 180 | |
| 181 | |
| 182 | #ifdef CONFIG_DEBUG_FS |
| 183 | |
| 184 | /* /sys/kernel/debug/at32ap_clk */ |
| 185 | |
| 186 | #include <linux/io.h> |
| 187 | #include <linux/debugfs.h> |
| 188 | #include <linux/seq_file.h> |
| 189 | #include "pm.h" |
| 190 | |
| 191 | |
| 192 | #define NEST_DELTA 2 |
| 193 | #define NEST_MAX 6 |
| 194 | |
| 195 | struct clkinf { |
| 196 | struct seq_file *s; |
| 197 | unsigned nest; |
| 198 | }; |
| 199 | |
| 200 | static void |
| 201 | dump_clock(struct clk *parent, struct clkinf *r) |
| 202 | { |
| 203 | unsigned nest = r->nest; |
| 204 | char buf[16 + NEST_MAX]; |
| 205 | struct clk *clk; |
| 206 | unsigned i; |
| 207 | |
| 208 | /* skip clocks coupled to devices that aren't registered */ |
Kay Sievers | 169539c | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 209 | if (parent->dev && !dev_name(parent->dev) && !parent->users) |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 210 | return; |
| 211 | |
| 212 | /* <nest spaces> name <pad to end> */ |
| 213 | memset(buf, ' ', sizeof(buf) - 1); |
| 214 | buf[sizeof(buf) - 1] = 0; |
| 215 | i = strlen(parent->name); |
| 216 | memcpy(buf + nest, parent->name, |
| 217 | min(i, (unsigned)(sizeof(buf) - 1 - nest))); |
| 218 | |
| 219 | seq_printf(r->s, "%s%c users=%2d %-3s %9ld Hz", |
| 220 | buf, parent->set_parent ? '*' : ' ', |
| 221 | parent->users, |
| 222 | parent->users ? "on" : "off", /* NOTE: not-paranoid!! */ |
| 223 | clk_get_rate(parent)); |
| 224 | if (parent->dev) |
Kay Sievers | 169539c | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 225 | seq_printf(r->s, ", for %s", dev_name(parent->dev)); |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 226 | seq_printf(r->s, "\n"); |
| 227 | |
| 228 | /* cost of this scan is small, but not linear... */ |
| 229 | r->nest = nest + NEST_DELTA; |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 230 | |
| 231 | list_for_each_entry(clk, &at32_clock_list, list) { |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 232 | if (clk->parent == parent) |
| 233 | dump_clock(clk, r); |
| 234 | } |
| 235 | r->nest = nest; |
| 236 | } |
| 237 | |
| 238 | static int clk_show(struct seq_file *s, void *unused) |
| 239 | { |
| 240 | struct clkinf r; |
| 241 | int i; |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 242 | struct clk *clk; |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 243 | |
| 244 | /* show all the power manager registers */ |
| 245 | seq_printf(s, "MCCTRL = %8x\n", pm_readl(MCCTRL)); |
| 246 | seq_printf(s, "CKSEL = %8x\n", pm_readl(CKSEL)); |
| 247 | seq_printf(s, "CPUMASK = %8x\n", pm_readl(CPU_MASK)); |
| 248 | seq_printf(s, "HSBMASK = %8x\n", pm_readl(HSB_MASK)); |
| 249 | seq_printf(s, "PBAMASK = %8x\n", pm_readl(PBA_MASK)); |
| 250 | seq_printf(s, "PBBMASK = %8x\n", pm_readl(PBB_MASK)); |
| 251 | seq_printf(s, "PLL0 = %8x\n", pm_readl(PLL0)); |
| 252 | seq_printf(s, "PLL1 = %8x\n", pm_readl(PLL1)); |
| 253 | seq_printf(s, "IMR = %8x\n", pm_readl(IMR)); |
| 254 | for (i = 0; i < 8; i++) { |
| 255 | if (i == 5) |
| 256 | continue; |
| 257 | seq_printf(s, "GCCTRL%d = %8x\n", i, pm_readl(GCCTRL(i))); |
| 258 | } |
| 259 | |
| 260 | seq_printf(s, "\n"); |
| 261 | |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 262 | r.s = s; |
| 263 | r.nest = 0; |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 264 | /* protected from changes on the list while dumping */ |
| 265 | spin_lock(&clk_list_lock); |
| 266 | |
| 267 | /* show clock tree as derived from the three oscillators */ |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 268 | clk = __clk_get(NULL, "osc32k"); |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 269 | dump_clock(clk, &r); |
| 270 | clk_put(clk); |
| 271 | |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 272 | clk = __clk_get(NULL, "osc0"); |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 273 | dump_clock(clk, &r); |
| 274 | clk_put(clk); |
| 275 | |
Ole Henrik Jahren | 6e2ad51 | 2011-03-06 20:42:39 +0100 | [diff] [blame] | 276 | clk = __clk_get(NULL, "osc1"); |
Alex Raimondi | 300bb76 | 2008-09-22 21:40:55 +0200 | [diff] [blame] | 277 | dump_clock(clk, &r); |
| 278 | clk_put(clk); |
| 279 | |
| 280 | spin_unlock(&clk_list_lock); |
David Brownell | d938b89 | 2007-08-09 20:56:07 -0700 | [diff] [blame] | 281 | |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | static int clk_open(struct inode *inode, struct file *file) |
| 286 | { |
| 287 | return single_open(file, clk_show, NULL); |
| 288 | } |
| 289 | |
| 290 | static const struct file_operations clk_operations = { |
| 291 | .open = clk_open, |
| 292 | .read = seq_read, |
| 293 | .llseek = seq_lseek, |
| 294 | .release = single_release, |
| 295 | }; |
| 296 | |
| 297 | static int __init clk_debugfs_init(void) |
| 298 | { |
| 299 | (void) debugfs_create_file("at32ap_clk", S_IFREG | S_IRUGO, |
| 300 | NULL, NULL, &clk_operations); |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | postcore_initcall(clk_debugfs_init); |
| 305 | |
| 306 | #endif |