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 static 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_6338_ENET_EN;
54 else if (BCMCPU_IS_6345())
55 mask = CKCTL_6345_ENET_EN;
56 else if (BCMCPU_IS_6348())
57 mask = CKCTL_6348_ENET_EN;
60 mask = CKCTL_6358_EMUSB_EN;
61 bcm_hwclock_set(mask, enable);
64 static struct clk clk_enet_misc = {
69 * Ethernet MAC clocks: only revelant on 6358, silently enable misc
72 static void enetx_set(struct clk *clk, int enable)
75 clk_enable_unlocked(&clk_enet_misc);
77 clk_disable_unlocked(&clk_enet_misc);
79 if (BCMCPU_IS_6358()) {
83 mask = CKCTL_6358_ENET0_EN;
85 mask = CKCTL_6358_ENET1_EN;
86 bcm_hwclock_set(mask, enable);
90 static struct clk clk_enet0 = {
95 static struct clk clk_enet1 = {
103 static void ephy_set(struct clk *clk, int enable)
105 if (!BCMCPU_IS_6358())
107 bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
111 static struct clk clk_ephy = {
118 static void pcm_set(struct clk *clk, int enable)
120 if (!BCMCPU_IS_6358())
122 bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
125 static struct clk clk_pcm = {
132 static void usbh_set(struct clk *clk, int enable)
134 if (!BCMCPU_IS_6348())
136 bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
139 static struct clk clk_usbh = {
146 static void spi_set(struct clk *clk, int enable)
150 if (BCMCPU_IS_6338())
151 mask = CKCTL_6338_SPI_EN;
152 else if (BCMCPU_IS_6348())
153 mask = CKCTL_6348_SPI_EN;
156 mask = CKCTL_6358_SPI_EN;
157 bcm_hwclock_set(mask, enable);
160 static struct clk clk_spi = {
165 * Internal peripheral clock
167 static struct clk clk_periph = {
168 .rate = (50 * 1000 * 1000),
173 * Linux clock API implementation
175 int clk_enable(struct clk *clk)
177 mutex_lock(&clocks_mutex);
178 clk_enable_unlocked(clk);
179 mutex_unlock(&clocks_mutex);
183 EXPORT_SYMBOL(clk_enable);
185 void clk_disable(struct clk *clk)
187 mutex_lock(&clocks_mutex);
188 clk_disable_unlocked(clk);
189 mutex_unlock(&clocks_mutex);
192 EXPORT_SYMBOL(clk_disable);
194 unsigned long clk_get_rate(struct clk *clk)
199 EXPORT_SYMBOL(clk_get_rate);
201 struct clk *clk_get(struct device *dev, const char *id)
203 if (!strcmp(id, "enet0"))
205 if (!strcmp(id, "enet1"))
207 if (!strcmp(id, "ephy"))
209 if (!strcmp(id, "usbh"))
211 if (!strcmp(id, "spi"))
213 if (!strcmp(id, "periph"))
215 if (BCMCPU_IS_6358() && !strcmp(id, "pcm"))
217 return ERR_PTR(-ENOENT);
220 EXPORT_SYMBOL(clk_get);
222 void clk_put(struct clk *clk)
226 EXPORT_SYMBOL(clk_put);