2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
9 #include <linux/module.h>
10 #include <linux/mutex.h>
11 #include <linux/err.h>
12 #include <linux/clk.h>
13 #include <bcm63xx_cpu.h>
14 #include <bcm63xx_io.h>
15 #include <bcm63xx_regs.h>
16 #include <bcm63xx_clk.h>
18 DEFINE_MUTEX(clocks_mutex);
21 static void clk_enable_unlocked(struct clk *clk)
23 if (clk->set && (clk->usage++) == 0)
27 static void clk_disable_unlocked(struct clk *clk)
29 if (clk->set && (--clk->usage) == 0)
33 static void bcm_hwclock_set(u32 mask, int enable)
37 reg = bcm_perf_readl(PERF_CKCTL_REG);
42 bcm_perf_writel(reg, PERF_CKCTL_REG);
46 * Ethernet MAC "misc" clock: dma clocks and main clock on 6348
48 static void enet_misc_set(struct clk *clk, int enable)
53 mask = CKCTL_6348_ENET_EN;
56 mask = CKCTL_6358_EMUSB_EN;
57 bcm_hwclock_set(mask, enable);
60 static struct clk clk_enet_misc = {
65 * Ethernet MAC clocks: only revelant on 6358, silently enable misc
68 static void enetx_set(struct clk *clk, int enable)
71 clk_enable_unlocked(&clk_enet_misc);
73 clk_disable_unlocked(&clk_enet_misc);
75 if (BCMCPU_IS_6358()) {
79 mask = CKCTL_6358_ENET0_EN;
81 mask = CKCTL_6358_ENET1_EN;
82 bcm_hwclock_set(mask, enable);
86 static struct clk clk_enet0 = {
91 static struct clk clk_enet1 = {
99 static void ephy_set(struct clk *clk, int enable)
101 if (!BCMCPU_IS_6358())
103 bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
107 static struct clk clk_ephy = {
114 static void pcm_set(struct clk *clk, int enable)
116 if (!BCMCPU_IS_6358())
118 bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
121 static struct clk clk_pcm = {
128 static void usbh_set(struct clk *clk, int enable)
130 if (!BCMCPU_IS_6348())
132 bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
135 static struct clk clk_usbh = {
142 static void spi_set(struct clk *clk, int enable)
146 if (BCMCPU_IS_6348())
147 mask = CKCTL_6348_SPI_EN;
150 mask = CKCTL_6358_SPI_EN;
151 bcm_hwclock_set(mask, enable);
154 static struct clk clk_spi = {
159 * Internal peripheral clock
161 static struct clk clk_periph = {
162 .rate = (50 * 1000 * 1000),
167 * Linux clock API implementation
169 int clk_enable(struct clk *clk)
171 mutex_lock(&clocks_mutex);
172 clk_enable_unlocked(clk);
173 mutex_unlock(&clocks_mutex);
177 EXPORT_SYMBOL(clk_enable);
179 void clk_disable(struct clk *clk)
181 mutex_lock(&clocks_mutex);
182 clk_disable_unlocked(clk);
183 mutex_unlock(&clocks_mutex);
186 EXPORT_SYMBOL(clk_disable);
188 unsigned long clk_get_rate(struct clk *clk)
193 EXPORT_SYMBOL(clk_get_rate);
195 struct clk *clk_get(struct device *dev, const char *id)
197 if (!strcmp(id, "enet0"))
199 if (!strcmp(id, "enet1"))
201 if (!strcmp(id, "ephy"))
203 if (!strcmp(id, "usbh"))
205 if (!strcmp(id, "spi"))
207 if (!strcmp(id, "periph"))
209 if (BCMCPU_IS_6358() && !strcmp(id, "pcm"))
211 return ERR_PTR(-ENOENT);
214 EXPORT_SYMBOL(clk_get);
216 void clk_put(struct clk *clk)
220 EXPORT_SYMBOL(clk_put);