3 * Ben Gray <ben.r.gray@gmail.com>.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Ben Gray.
17 * 4. The name of the company nor the name of the author may be used to
18 * endorse or promote products derived from this software without specific
19 * prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
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24 * IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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34 * Power, Reset and Clock Managment Module
36 * This is a very simple driver wrapper around the PRCM set of registers in
37 * the OMAP3 chip. It allows you to turn on and off things like the functional
38 * and interface clocks to the various on-chip modules.
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/module.h>
49 #include <sys/resource.h>
52 #include <sys/mutex.h>
54 #include <machine/bus.h>
55 #include <machine/cpu.h>
56 #include <machine/cpufunc.h>
57 #include <machine/resource.h>
58 #include <machine/intr.h>
60 #include <arm/ti/ti_prcm.h>
63 * ti_clk_devmap - Array of clock devices, should be defined one per SoC
65 * This array is typically defined in one of the targeted *_prcm_clk.c
66 * files and is specific to the given SoC platform. Each entry in the array
67 * corresponds to an individual clock device.
69 extern struct ti_clock_dev ti_clk_devmap[];
72 * ti_prcm_clk_dev - returns a pointer to the clock device with given id
73 * @clk: the ID of the clock device to get
75 * Simply iterates through the clk_devmap global array and returns a pointer
76 * to the clock device if found.
82 * The pointer to the clock device on success, on failure NULL is returned.
84 static struct ti_clock_dev *
85 ti_prcm_clk_dev(clk_ident_t clk)
87 struct ti_clock_dev *clk_dev;
89 /* Find the clock within the devmap - it's a bit inefficent having a for
90 * loop for this, but this function should only called when a driver is
91 * being activated so IMHO not a big issue.
93 clk_dev = &(ti_clk_devmap[0]);
94 while (clk_dev->id != INVALID_CLK_IDENT) {
95 if (clk_dev->id == clk) {
101 /* Sanity check we managed to find the clock */
102 printf("ti_prcm: Failed to find clock device (%d)\n", clk);
107 * ti_prcm_clk_valid - enables a clock for a particular module
108 * @clk: identifier for the module to enable, see ti_prcm.h for a list
109 * of possible modules.
110 * Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
112 * This function can enable either a functional or interface clock.
114 * The real work done to enable the clock is really done in the callback
115 * function associated with the clock, this function is simply a wrapper
119 * Internally locks the driver context.
122 * Returns 0 on success or positive error code on failure.
125 ti_prcm_clk_valid(clk_ident_t clk)
129 if (ti_prcm_clk_dev(clk) == NULL)
137 * ti_prcm_clk_enable - enables a clock for a particular module
138 * @clk: identifier for the module to enable, see ti_prcm.h for a list
139 * of possible modules.
140 * Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
142 * This function can enable either a functional or interface clock.
144 * The real work done to enable the clock is really done in the callback
145 * function associated with the clock, this function is simply a wrapper
149 * Internally locks the driver context.
152 * Returns 0 on success or positive error code on failure.
155 ti_prcm_clk_enable(clk_ident_t clk)
157 struct ti_clock_dev *clk_dev;
160 /* Find the clock within the devmap - it's a bit inefficent having a for
161 * loop for this, but this function should only called when a driver is
162 * being activated so IMHO not a big issue.
164 clk_dev = ti_prcm_clk_dev(clk);
166 /* Sanity check we managed to find the clock */
170 /* Activate the clock */
171 if (clk_dev->clk_activate)
172 ret = clk_dev->clk_activate(clk_dev);
181 * ti_prcm_clk_disable - disables a clock for a particular module
182 * @clk: identifier for the module to enable, see ti_prcm.h for a list
183 * of possible modules.
184 * Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
186 * This function can enable either a functional or interface clock.
188 * The real work done to enable the clock is really done in the callback
189 * function associated with the clock, this function is simply a wrapper
193 * Internally locks the driver context.
196 * Returns 0 on success or positive error code on failure.
199 ti_prcm_clk_disable(clk_ident_t clk)
201 struct ti_clock_dev *clk_dev;
204 /* Find the clock within the devmap - it's a bit inefficent having a for
205 * loop for this, but this function should only called when a driver is
206 * being activated so IMHO not a big issue.
208 clk_dev = ti_prcm_clk_dev(clk);
210 /* Sanity check we managed to find the clock */
214 /* Activate the clock */
215 if (clk_dev->clk_deactivate)
216 ret = clk_dev->clk_deactivate(clk_dev);
224 * ti_prcm_clk_set_source - sets the source
225 * @clk: identifier for the module to enable, see ti_prcm.h for a list
226 * of possible modules.
227 * Example: OMAP3_MODULE_MMC1_ICLK or OMAP3_MODULE_GPTIMER10_FCLK.
229 * This function can enable either a functional or interface clock.
231 * The real work done to enable the clock is really done in the callback
232 * function associated with the clock, this function is simply a wrapper
236 * Internally locks the driver context.
239 * Returns 0 on success or positive error code on failure.
242 ti_prcm_clk_set_source(clk_ident_t clk, clk_src_t clksrc)
244 struct ti_clock_dev *clk_dev;
247 /* Find the clock within the devmap - it's a bit inefficent having a for
248 * loop for this, but this function should only called when a driver is
249 * being activated so IMHO not a big issue.
251 clk_dev = ti_prcm_clk_dev(clk);
253 /* Sanity check we managed to find the clock */
257 /* Activate the clock */
258 if (clk_dev->clk_set_source)
259 ret = clk_dev->clk_set_source(clk_dev, clksrc);
268 * ti_prcm_clk_get_source_freq - gets the source clock frequency
269 * @clk: identifier for the module to enable, see ti_prcm.h for a list
270 * of possible modules.
271 * @freq: pointer to an integer that upon return will contain the src freq
273 * This function returns the frequency of the source clock.
275 * The real work done to enable the clock is really done in the callback
276 * function associated with the clock, this function is simply a wrapper
280 * Internally locks the driver context.
283 * Returns 0 on success or positive error code on failure.
286 ti_prcm_clk_get_source_freq(clk_ident_t clk, unsigned int *freq)
288 struct ti_clock_dev *clk_dev;
291 /* Find the clock within the devmap - it's a bit inefficent having a for
292 * loop for this, but this function should only called when a driver is
293 * being activated so IMHO not a big issue.
295 clk_dev = ti_prcm_clk_dev(clk);
297 /* Sanity check we managed to find the clock */
301 /* Get the source frequency of the clock */
302 if (clk_dev->clk_get_source_freq)
303 ret = clk_dev->clk_get_source_freq(clk_dev, freq);