Vladimir Barinov | 3e062b0 | 2007-06-05 16:36:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * TI DaVinci clock config file |
| 3 | * |
| 4 | * Copyright (C) 2006 Texas Instruments. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/mutex.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | |
| 20 | #include <asm/hardware.h> |
| 21 | #include <asm/io.h> |
| 22 | |
| 23 | #include <asm/arch/psc.h> |
| 24 | #include "clock.h" |
| 25 | |
| 26 | /* PLL/Reset register offsets */ |
| 27 | #define PLLM 0x110 |
| 28 | |
| 29 | static LIST_HEAD(clocks); |
| 30 | static DEFINE_MUTEX(clocks_mutex); |
| 31 | static DEFINE_SPINLOCK(clockfw_lock); |
| 32 | |
| 33 | static unsigned int commonrate; |
| 34 | static unsigned int armrate; |
| 35 | static unsigned int fixedrate = 27000000; /* 27 MHZ */ |
| 36 | |
| 37 | extern void davinci_psc_config(unsigned int domain, unsigned int id, char enable); |
| 38 | |
| 39 | /* |
| 40 | * Returns a clock. Note that we first try to use device id on the bus |
| 41 | * and clock name. If this fails, we try to use clock name only. |
| 42 | */ |
| 43 | struct clk *clk_get(struct device *dev, const char *id) |
| 44 | { |
| 45 | struct clk *p, *clk = ERR_PTR(-ENOENT); |
| 46 | int idno; |
| 47 | |
| 48 | if (dev == NULL || dev->bus != &platform_bus_type) |
| 49 | idno = -1; |
| 50 | else |
| 51 | idno = to_platform_device(dev)->id; |
| 52 | |
| 53 | mutex_lock(&clocks_mutex); |
| 54 | |
| 55 | list_for_each_entry(p, &clocks, node) { |
| 56 | if (p->id == idno && |
| 57 | strcmp(id, p->name) == 0 && try_module_get(p->owner)) { |
| 58 | clk = p; |
| 59 | goto found; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | list_for_each_entry(p, &clocks, node) { |
| 64 | if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { |
| 65 | clk = p; |
| 66 | break; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | found: |
| 71 | mutex_unlock(&clocks_mutex); |
| 72 | |
| 73 | return clk; |
| 74 | } |
| 75 | EXPORT_SYMBOL(clk_get); |
| 76 | |
| 77 | void clk_put(struct clk *clk) |
| 78 | { |
| 79 | if (clk && !IS_ERR(clk)) |
| 80 | module_put(clk->owner); |
| 81 | } |
| 82 | EXPORT_SYMBOL(clk_put); |
| 83 | |
| 84 | static int __clk_enable(struct clk *clk) |
| 85 | { |
| 86 | if (clk->flags & ALWAYS_ENABLED) |
| 87 | return 0; |
| 88 | |
| 89 | davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, clk->lpsc, 1); |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static void __clk_disable(struct clk *clk) |
| 94 | { |
| 95 | if (clk->usecount) |
| 96 | return; |
| 97 | |
| 98 | davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, clk->lpsc, 0); |
| 99 | } |
| 100 | |
| 101 | int clk_enable(struct clk *clk) |
| 102 | { |
| 103 | unsigned long flags; |
| 104 | int ret = 0; |
| 105 | |
| 106 | if (clk == NULL || IS_ERR(clk)) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | if (clk->usecount++ == 0) { |
| 110 | spin_lock_irqsave(&clockfw_lock, flags); |
| 111 | ret = __clk_enable(clk); |
| 112 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 113 | } |
| 114 | |
| 115 | return ret; |
| 116 | } |
| 117 | EXPORT_SYMBOL(clk_enable); |
| 118 | |
| 119 | void clk_disable(struct clk *clk) |
| 120 | { |
| 121 | unsigned long flags; |
| 122 | |
| 123 | if (clk == NULL || IS_ERR(clk)) |
| 124 | return; |
| 125 | |
| 126 | if (clk->usecount > 0 && !(--clk->usecount)) { |
| 127 | spin_lock_irqsave(&clockfw_lock, flags); |
| 128 | __clk_disable(clk); |
| 129 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 130 | } |
| 131 | } |
| 132 | EXPORT_SYMBOL(clk_disable); |
| 133 | |
| 134 | unsigned long clk_get_rate(struct clk *clk) |
| 135 | { |
| 136 | if (clk == NULL || IS_ERR(clk)) |
| 137 | return -EINVAL; |
| 138 | |
| 139 | return *(clk->rate); |
| 140 | } |
| 141 | EXPORT_SYMBOL(clk_get_rate); |
| 142 | |
| 143 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 144 | { |
| 145 | if (clk == NULL || IS_ERR(clk)) |
| 146 | return -EINVAL; |
| 147 | |
| 148 | return *(clk->rate); |
| 149 | } |
| 150 | EXPORT_SYMBOL(clk_round_rate); |
| 151 | |
| 152 | int clk_set_rate(struct clk *clk, unsigned long rate) |
| 153 | { |
| 154 | if (clk == NULL || IS_ERR(clk)) |
| 155 | return -EINVAL; |
| 156 | |
| 157 | /* changing the clk rate is not supported */ |
| 158 | return -EINVAL; |
| 159 | } |
| 160 | EXPORT_SYMBOL(clk_set_rate); |
| 161 | |
| 162 | int clk_register(struct clk *clk) |
| 163 | { |
| 164 | if (clk == NULL || IS_ERR(clk)) |
| 165 | return -EINVAL; |
| 166 | |
| 167 | mutex_lock(&clocks_mutex); |
| 168 | list_add(&clk->node, &clocks); |
| 169 | mutex_unlock(&clocks_mutex); |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | EXPORT_SYMBOL(clk_register); |
| 174 | |
| 175 | void clk_unregister(struct clk *clk) |
| 176 | { |
| 177 | if (clk == NULL || IS_ERR(clk)) |
| 178 | return; |
| 179 | |
| 180 | mutex_lock(&clocks_mutex); |
| 181 | list_del(&clk->node); |
| 182 | mutex_unlock(&clocks_mutex); |
| 183 | } |
| 184 | EXPORT_SYMBOL(clk_unregister); |
| 185 | |
| 186 | static struct clk davinci_clks[] = { |
| 187 | { |
| 188 | .name = "ARMCLK", |
| 189 | .rate = &armrate, |
| 190 | .lpsc = -1, |
| 191 | .flags = ALWAYS_ENABLED, |
| 192 | }, |
| 193 | { |
| 194 | .name = "UART", |
| 195 | .rate = &fixedrate, |
| 196 | .lpsc = DAVINCI_LPSC_UART0, |
| 197 | }, |
| 198 | { |
| 199 | .name = "EMACCLK", |
| 200 | .rate = &commonrate, |
| 201 | .lpsc = DAVINCI_LPSC_EMAC_WRAPPER, |
| 202 | }, |
| 203 | { |
| 204 | .name = "I2CCLK", |
| 205 | .rate = &fixedrate, |
| 206 | .lpsc = DAVINCI_LPSC_I2C, |
| 207 | }, |
| 208 | { |
| 209 | .name = "IDECLK", |
| 210 | .rate = &commonrate, |
| 211 | .lpsc = DAVINCI_LPSC_ATA, |
| 212 | }, |
| 213 | { |
| 214 | .name = "McBSPCLK", |
| 215 | .rate = &commonrate, |
| 216 | .lpsc = DAVINCI_LPSC_McBSP, |
| 217 | }, |
| 218 | { |
| 219 | .name = "MMCSDCLK", |
| 220 | .rate = &commonrate, |
| 221 | .lpsc = DAVINCI_LPSC_MMC_SD, |
| 222 | }, |
| 223 | { |
| 224 | .name = "SPICLK", |
| 225 | .rate = &commonrate, |
| 226 | .lpsc = DAVINCI_LPSC_SPI, |
| 227 | }, |
| 228 | { |
| 229 | .name = "gpio", |
| 230 | .rate = &commonrate, |
| 231 | .lpsc = DAVINCI_LPSC_GPIO, |
| 232 | }, |
| 233 | { |
| 234 | .name = "AEMIFCLK", |
| 235 | .rate = &commonrate, |
| 236 | .lpsc = DAVINCI_LPSC_AEMIF, |
| 237 | .usecount = 1, |
| 238 | } |
| 239 | }; |
| 240 | |
| 241 | int __init davinci_clk_init(void) |
| 242 | { |
| 243 | struct clk *clkp; |
| 244 | int count = 0; |
| 245 | u32 pll_mult; |
| 246 | |
| 247 | pll_mult = davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLM); |
| 248 | commonrate = ((pll_mult + 1) * 27000000) / 6; |
| 249 | armrate = ((pll_mult + 1) * 27000000) / 2; |
| 250 | |
| 251 | for (clkp = davinci_clks; count < ARRAY_SIZE(davinci_clks); |
| 252 | count++, clkp++) { |
| 253 | clk_register(clkp); |
| 254 | |
| 255 | /* Turn on clocks that have been enabled in the |
| 256 | * table above */ |
| 257 | if (clkp->usecount) |
| 258 | clk_enable(clkp); |
| 259 | } |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | #ifdef CONFIG_PROC_FS |
| 265 | #include <linux/proc_fs.h> |
| 266 | #include <linux/seq_file.h> |
| 267 | |
| 268 | static void *davinci_ck_start(struct seq_file *m, loff_t *pos) |
| 269 | { |
| 270 | return *pos < 1 ? (void *)1 : NULL; |
| 271 | } |
| 272 | |
| 273 | static void *davinci_ck_next(struct seq_file *m, void *v, loff_t *pos) |
| 274 | { |
| 275 | ++*pos; |
| 276 | return NULL; |
| 277 | } |
| 278 | |
| 279 | static void davinci_ck_stop(struct seq_file *m, void *v) |
| 280 | { |
| 281 | } |
| 282 | |
| 283 | static int davinci_ck_show(struct seq_file *m, void *v) |
| 284 | { |
| 285 | struct clk *cp; |
| 286 | |
| 287 | list_for_each_entry(cp, &clocks, node) |
| 288 | seq_printf(m,"%s %d %d\n", cp->name, *(cp->rate), cp->usecount); |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
Jan Engelhardt | 2ffd6e1 | 2008-01-22 20:41:07 +0100 | [diff] [blame] | 293 | static const struct seq_operations davinci_ck_op = { |
Vladimir Barinov | 3e062b0 | 2007-06-05 16:36:55 +0100 | [diff] [blame] | 294 | .start = davinci_ck_start, |
| 295 | .next = davinci_ck_next, |
| 296 | .stop = davinci_ck_stop, |
| 297 | .show = davinci_ck_show |
| 298 | }; |
| 299 | |
| 300 | static int davinci_ck_open(struct inode *inode, struct file *file) |
| 301 | { |
| 302 | return seq_open(file, &davinci_ck_op); |
| 303 | } |
| 304 | |
Jan Engelhardt | 2ffd6e1 | 2008-01-22 20:41:07 +0100 | [diff] [blame] | 305 | static const struct file_operations proc_davinci_ck_operations = { |
Vladimir Barinov | 3e062b0 | 2007-06-05 16:36:55 +0100 | [diff] [blame] | 306 | .open = davinci_ck_open, |
| 307 | .read = seq_read, |
| 308 | .llseek = seq_lseek, |
| 309 | .release = seq_release, |
| 310 | }; |
| 311 | |
| 312 | static int __init davinci_ck_proc_init(void) |
| 313 | { |
Denis V. Lunev | 40ad35d | 2008-04-29 01:02:21 -0700 | [diff] [blame^] | 314 | proc_create("davinci_clocks", 0, NULL, &proc_davinci_ck_operations); |
Vladimir Barinov | 3e062b0 | 2007-06-05 16:36:55 +0100 | [diff] [blame] | 315 | return 0; |
| 316 | |
| 317 | } |
| 318 | __initcall(davinci_ck_proc_init); |
| 319 | #endif /* CONFIG_DEBUG_PROC_FS */ |