1 /*
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
4 * for more details.
5 *
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 */
8
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>
17
18 static DEFINE_MUTEX(clocks_mutex);
19
20
clk_enable_unlocked(struct clk * clk)21 static void clk_enable_unlocked(struct clk *clk)
22 {
23 if (clk->set && (clk->usage++) == 0)
24 clk->set(clk, 1);
25 }
26
clk_disable_unlocked(struct clk * clk)27 static void clk_disable_unlocked(struct clk *clk)
28 {
29 if (clk->set && (--clk->usage) == 0)
30 clk->set(clk, 0);
31 }
32
bcm_hwclock_set(u32 mask,int enable)33 static void bcm_hwclock_set(u32 mask, int enable)
34 {
35 u32 reg;
36
37 reg = bcm_perf_readl(PERF_CKCTL_REG);
38 if (enable)
39 reg |= mask;
40 else
41 reg &= ~mask;
42 bcm_perf_writel(reg, PERF_CKCTL_REG);
43 }
44
45 /*
46 * Ethernet MAC "misc" clock: dma clocks and main clock on 6348
47 */
enet_misc_set(struct clk * clk,int enable)48 static void enet_misc_set(struct clk *clk, int enable)
49 {
50 u32 mask;
51
52 if (BCMCPU_IS_6338())
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;
58 else
59 /* BCMCPU_IS_6358 */
60 mask = CKCTL_6358_EMUSB_EN;
61 bcm_hwclock_set(mask, enable);
62 }
63
64 static struct clk clk_enet_misc = {
65 .set = enet_misc_set,
66 };
67
68 /*
69 * Ethernet MAC clocks: only revelant on 6358, silently enable misc
70 * clocks
71 */
enetx_set(struct clk * clk,int enable)72 static void enetx_set(struct clk *clk, int enable)
73 {
74 if (enable)
75 clk_enable_unlocked(&clk_enet_misc);
76 else
77 clk_disable_unlocked(&clk_enet_misc);
78
79 if (BCMCPU_IS_6358()) {
80 u32 mask;
81
82 if (clk->id == 0)
83 mask = CKCTL_6358_ENET0_EN;
84 else
85 mask = CKCTL_6358_ENET1_EN;
86 bcm_hwclock_set(mask, enable);
87 }
88 }
89
90 static struct clk clk_enet0 = {
91 .id = 0,
92 .set = enetx_set,
93 };
94
95 static struct clk clk_enet1 = {
96 .id = 1,
97 .set = enetx_set,
98 };
99
100 /*
101 * Ethernet PHY clock
102 */
ephy_set(struct clk * clk,int enable)103 static void ephy_set(struct clk *clk, int enable)
104 {
105 if (!BCMCPU_IS_6358())
106 return;
107 bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
108 }
109
110
111 static struct clk clk_ephy = {
112 .set = ephy_set,
113 };
114
115 /*
116 * PCM clock
117 */
pcm_set(struct clk * clk,int enable)118 static void pcm_set(struct clk *clk, int enable)
119 {
120 if (!BCMCPU_IS_6358())
121 return;
122 bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
123 }
124
125 static struct clk clk_pcm = {
126 .set = pcm_set,
127 };
128
129 /*
130 * USB host clock
131 */
usbh_set(struct clk * clk,int enable)132 static void usbh_set(struct clk *clk, int enable)
133 {
134 if (!BCMCPU_IS_6348())
135 return;
136 bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
137 }
138
139 static struct clk clk_usbh = {
140 .set = usbh_set,
141 };
142
143 /*
144 * SPI clock
145 */
spi_set(struct clk * clk,int enable)146 static void spi_set(struct clk *clk, int enable)
147 {
148 u32 mask;
149
150 if (BCMCPU_IS_6338())
151 mask = CKCTL_6338_SPI_EN;
152 else if (BCMCPU_IS_6348())
153 mask = CKCTL_6348_SPI_EN;
154 else
155 /* BCMCPU_IS_6358 */
156 mask = CKCTL_6358_SPI_EN;
157 bcm_hwclock_set(mask, enable);
158 }
159
160 static struct clk clk_spi = {
161 .set = spi_set,
162 };
163
164 /*
165 * Internal peripheral clock
166 */
167 static struct clk clk_periph = {
168 .rate = (50 * 1000 * 1000),
169 };
170
171
172 /*
173 * Linux clock API implementation
174 */
clk_enable(struct clk * clk)175 int clk_enable(struct clk *clk)
176 {
177 mutex_lock(&clocks_mutex);
178 clk_enable_unlocked(clk);
179 mutex_unlock(&clocks_mutex);
180 return 0;
181 }
182
183 EXPORT_SYMBOL(clk_enable);
184
clk_disable(struct clk * clk)185 void clk_disable(struct clk *clk)
186 {
187 mutex_lock(&clocks_mutex);
188 clk_disable_unlocked(clk);
189 mutex_unlock(&clocks_mutex);
190 }
191
192 EXPORT_SYMBOL(clk_disable);
193
clk_get_rate(struct clk * clk)194 unsigned long clk_get_rate(struct clk *clk)
195 {
196 return clk->rate;
197 }
198
199 EXPORT_SYMBOL(clk_get_rate);
200
clk_get(struct device * dev,const char * id)201 struct clk *clk_get(struct device *dev, const char *id)
202 {
203 if (!strcmp(id, "enet0"))
204 return &clk_enet0;
205 if (!strcmp(id, "enet1"))
206 return &clk_enet1;
207 if (!strcmp(id, "ephy"))
208 return &clk_ephy;
209 if (!strcmp(id, "usbh"))
210 return &clk_usbh;
211 if (!strcmp(id, "spi"))
212 return &clk_spi;
213 if (!strcmp(id, "periph"))
214 return &clk_periph;
215 if (BCMCPU_IS_6358() && !strcmp(id, "pcm"))
216 return &clk_pcm;
217 return ERR_PTR(-ENOENT);
218 }
219
220 EXPORT_SYMBOL(clk_get);
221
clk_put(struct clk * clk)222 void clk_put(struct clk *clk)
223 {
224 }
225
226 EXPORT_SYMBOL(clk_put);
227