1 /*
2 * cmu.c, Clock Mask Unit routines for the NEC VR4100 series.
3 *
4 * Copyright (C) 2001-2002 MontaVista Software Inc.
5 * Author: Yoichi Yuasa <source@mvista.com>
6 * Copuright (C) 2003-2005 Yoichi Yuasa <yuasa@linux-mips.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 /*
23 * Changes:
24 * MontaVista Software Inc. <source@mvista.com>
25 * - New creation, NEC VR4122 and VR4131 are supported.
26 * - Added support for NEC VR4111 and VR4121.
27 *
28 * Yoichi Yuasa <yuasa@linux-mips.org>
29 * - Added support for NEC VR4133.
30 */
31 #include <linux/init.h>
32 #include <linux/ioport.h>
33 #include <linux/module.h>
34 #include <linux/smp.h>
35 #include <linux/spinlock.h>
36 #include <linux/types.h>
37
38 #include <asm/cpu.h>
39 #include <asm/io.h>
40 #include <asm/vr41xx/vr41xx.h>
41
42 #define CMU_TYPE1_BASE 0x0b000060UL
43 #define CMU_TYPE1_SIZE 0x4
44
45 #define CMU_TYPE2_BASE 0x0f000060UL
46 #define CMU_TYPE2_SIZE 0x4
47
48 #define CMU_TYPE3_BASE 0x0f000060UL
49 #define CMU_TYPE3_SIZE 0x8
50
51 #define CMUCLKMSK 0x0
52 #define MSKPIU 0x0001
53 #define MSKSIU 0x0002
54 #define MSKAIU 0x0004
55 #define MSKKIU 0x0008
56 #define MSKFIR 0x0010
57 #define MSKDSIU 0x0820
58 #define MSKCSI 0x0040
59 #define MSKPCIU 0x0080
60 #define MSKSSIU 0x0100
61 #define MSKSHSP 0x0200
62 #define MSKFFIR 0x0400
63 #define MSKSCSI 0x1000
64 #define MSKPPCIU 0x2000
65 #define CMUCLKMSK2 0x4
66 #define MSKCEU 0x0001
67 #define MSKMAC0 0x0002
68 #define MSKMAC1 0x0004
69
70 static void __iomem *cmu_base;
71 static uint16_t cmuclkmsk, cmuclkmsk2;
72 static DEFINE_SPINLOCK(cmu_lock);
73
74 #define cmu_read(offset) readw(cmu_base + (offset))
75 #define cmu_write(offset, value) writew((value), cmu_base + (offset))
76
vr41xx_supply_clock(vr41xx_clock_t clock)77 void vr41xx_supply_clock(vr41xx_clock_t clock)
78 {
79 spin_lock_irq(&cmu_lock);
80
81 switch (clock) {
82 case PIU_CLOCK:
83 cmuclkmsk |= MSKPIU;
84 break;
85 case SIU_CLOCK:
86 cmuclkmsk |= MSKSIU | MSKSSIU;
87 break;
88 case AIU_CLOCK:
89 cmuclkmsk |= MSKAIU;
90 break;
91 case KIU_CLOCK:
92 cmuclkmsk |= MSKKIU;
93 break;
94 case FIR_CLOCK:
95 cmuclkmsk |= MSKFIR | MSKFFIR;
96 break;
97 case DSIU_CLOCK:
98 if (current_cpu_type() == CPU_VR4111 ||
99 current_cpu_type() == CPU_VR4121)
100 cmuclkmsk |= MSKDSIU;
101 else
102 cmuclkmsk |= MSKSIU | MSKDSIU;
103 break;
104 case CSI_CLOCK:
105 cmuclkmsk |= MSKCSI | MSKSCSI;
106 break;
107 case PCIU_CLOCK:
108 cmuclkmsk |= MSKPCIU;
109 break;
110 case HSP_CLOCK:
111 cmuclkmsk |= MSKSHSP;
112 break;
113 case PCI_CLOCK:
114 cmuclkmsk |= MSKPPCIU;
115 break;
116 case CEU_CLOCK:
117 cmuclkmsk2 |= MSKCEU;
118 break;
119 case ETHER0_CLOCK:
120 cmuclkmsk2 |= MSKMAC0;
121 break;
122 case ETHER1_CLOCK:
123 cmuclkmsk2 |= MSKMAC1;
124 break;
125 default:
126 break;
127 }
128
129 if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
130 clock == ETHER1_CLOCK)
131 cmu_write(CMUCLKMSK2, cmuclkmsk2);
132 else
133 cmu_write(CMUCLKMSK, cmuclkmsk);
134
135 spin_unlock_irq(&cmu_lock);
136 }
137
138 EXPORT_SYMBOL_GPL(vr41xx_supply_clock);
139
vr41xx_mask_clock(vr41xx_clock_t clock)140 void vr41xx_mask_clock(vr41xx_clock_t clock)
141 {
142 spin_lock_irq(&cmu_lock);
143
144 switch (clock) {
145 case PIU_CLOCK:
146 cmuclkmsk &= ~MSKPIU;
147 break;
148 case SIU_CLOCK:
149 if (current_cpu_type() == CPU_VR4111 ||
150 current_cpu_type() == CPU_VR4121) {
151 cmuclkmsk &= ~(MSKSIU | MSKSSIU);
152 } else {
153 if (cmuclkmsk & MSKDSIU)
154 cmuclkmsk &= ~MSKSSIU;
155 else
156 cmuclkmsk &= ~(MSKSIU | MSKSSIU);
157 }
158 break;
159 case AIU_CLOCK:
160 cmuclkmsk &= ~MSKAIU;
161 break;
162 case KIU_CLOCK:
163 cmuclkmsk &= ~MSKKIU;
164 break;
165 case FIR_CLOCK:
166 cmuclkmsk &= ~(MSKFIR | MSKFFIR);
167 break;
168 case DSIU_CLOCK:
169 if (current_cpu_type() == CPU_VR4111 ||
170 current_cpu_type() == CPU_VR4121) {
171 cmuclkmsk &= ~MSKDSIU;
172 } else {
173 if (cmuclkmsk & MSKSSIU)
174 cmuclkmsk &= ~MSKDSIU;
175 else
176 cmuclkmsk &= ~(MSKSIU | MSKDSIU);
177 }
178 break;
179 case CSI_CLOCK:
180 cmuclkmsk &= ~(MSKCSI | MSKSCSI);
181 break;
182 case PCIU_CLOCK:
183 cmuclkmsk &= ~MSKPCIU;
184 break;
185 case HSP_CLOCK:
186 cmuclkmsk &= ~MSKSHSP;
187 break;
188 case PCI_CLOCK:
189 cmuclkmsk &= ~MSKPPCIU;
190 break;
191 case CEU_CLOCK:
192 cmuclkmsk2 &= ~MSKCEU;
193 break;
194 case ETHER0_CLOCK:
195 cmuclkmsk2 &= ~MSKMAC0;
196 break;
197 case ETHER1_CLOCK:
198 cmuclkmsk2 &= ~MSKMAC1;
199 break;
200 default:
201 break;
202 }
203
204 if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
205 clock == ETHER1_CLOCK)
206 cmu_write(CMUCLKMSK2, cmuclkmsk2);
207 else
208 cmu_write(CMUCLKMSK, cmuclkmsk);
209
210 spin_unlock_irq(&cmu_lock);
211 }
212
213 EXPORT_SYMBOL_GPL(vr41xx_mask_clock);
214
vr41xx_cmu_init(void)215 static int __init vr41xx_cmu_init(void)
216 {
217 unsigned long start, size;
218
219 switch (current_cpu_type()) {
220 case CPU_VR4111:
221 case CPU_VR4121:
222 start = CMU_TYPE1_BASE;
223 size = CMU_TYPE1_SIZE;
224 break;
225 case CPU_VR4122:
226 case CPU_VR4131:
227 start = CMU_TYPE2_BASE;
228 size = CMU_TYPE2_SIZE;
229 break;
230 case CPU_VR4133:
231 start = CMU_TYPE3_BASE;
232 size = CMU_TYPE3_SIZE;
233 break;
234 default:
235 panic("Unexpected CPU of NEC VR4100 series");
236 break;
237 }
238
239 if (request_mem_region(start, size, "CMU") == NULL)
240 return -EBUSY;
241
242 cmu_base = ioremap(start, size);
243 if (cmu_base == NULL) {
244 release_mem_region(start, size);
245 return -EBUSY;
246 }
247
248 cmuclkmsk = cmu_read(CMUCLKMSK);
249 if (current_cpu_type() == CPU_VR4133)
250 cmuclkmsk2 = cmu_read(CMUCLKMSK2);
251
252 spin_lock_init(&cmu_lock);
253
254 return 0;
255 }
256
257 core_initcall(vr41xx_cmu_init);
258