1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * cmu.c, Clock Mask Unit routines for the NEC VR4100 series.
4 *
5 * Copyright (C) 2001-2002 MontaVista Software Inc.
6 * Author: Yoichi Yuasa <source@mvista.com>
7 * Copyright (C) 2003-2005 Yoichi Yuasa <yuasa@linux-mips.org>
8 */
9 /*
10 * Changes:
11 * MontaVista Software Inc. <source@mvista.com>
12 * - New creation, NEC VR4122 and VR4131 are supported.
13 * - Added support for NEC VR4111 and VR4121.
14 *
15 * Yoichi Yuasa <yuasa@linux-mips.org>
16 * - Added support for NEC VR4133.
17 */
18 #include <linux/export.h>
19 #include <linux/init.h>
20 #include <linux/ioport.h>
21 #include <linux/smp.h>
22 #include <linux/spinlock.h>
23 #include <linux/types.h>
24
25 #include <asm/cpu.h>
26 #include <asm/io.h>
27 #include <asm/vr41xx/vr41xx.h>
28
29 #define CMU_TYPE1_BASE 0x0b000060UL
30 #define CMU_TYPE1_SIZE 0x4
31
32 #define CMU_TYPE2_BASE 0x0f000060UL
33 #define CMU_TYPE2_SIZE 0x4
34
35 #define CMU_TYPE3_BASE 0x0f000060UL
36 #define CMU_TYPE3_SIZE 0x8
37
38 #define CMUCLKMSK 0x0
39 #define MSKPIU 0x0001
40 #define MSKSIU 0x0002
41 #define MSKAIU 0x0004
42 #define MSKKIU 0x0008
43 #define MSKFIR 0x0010
44 #define MSKDSIU 0x0820
45 #define MSKCSI 0x0040
46 #define MSKPCIU 0x0080
47 #define MSKSSIU 0x0100
48 #define MSKSHSP 0x0200
49 #define MSKFFIR 0x0400
50 #define MSKSCSI 0x1000
51 #define MSKPPCIU 0x2000
52 #define CMUCLKMSK2 0x4
53 #define MSKCEU 0x0001
54 #define MSKMAC0 0x0002
55 #define MSKMAC1 0x0004
56
57 static void __iomem *cmu_base;
58 static uint16_t cmuclkmsk, cmuclkmsk2;
59 static DEFINE_SPINLOCK(cmu_lock);
60
61 #define cmu_read(offset) readw(cmu_base + (offset))
62 #define cmu_write(offset, value) writew((value), cmu_base + (offset))
63
vr41xx_supply_clock(vr41xx_clock_t clock)64 void vr41xx_supply_clock(vr41xx_clock_t clock)
65 {
66 spin_lock_irq(&cmu_lock);
67
68 switch (clock) {
69 case PIU_CLOCK:
70 cmuclkmsk |= MSKPIU;
71 break;
72 case SIU_CLOCK:
73 cmuclkmsk |= MSKSIU | MSKSSIU;
74 break;
75 case AIU_CLOCK:
76 cmuclkmsk |= MSKAIU;
77 break;
78 case KIU_CLOCK:
79 cmuclkmsk |= MSKKIU;
80 break;
81 case FIR_CLOCK:
82 cmuclkmsk |= MSKFIR | MSKFFIR;
83 break;
84 case DSIU_CLOCK:
85 if (current_cpu_type() == CPU_VR4111 ||
86 current_cpu_type() == CPU_VR4121)
87 cmuclkmsk |= MSKDSIU;
88 else
89 cmuclkmsk |= MSKSIU | MSKDSIU;
90 break;
91 case CSI_CLOCK:
92 cmuclkmsk |= MSKCSI | MSKSCSI;
93 break;
94 case PCIU_CLOCK:
95 cmuclkmsk |= MSKPCIU;
96 break;
97 case HSP_CLOCK:
98 cmuclkmsk |= MSKSHSP;
99 break;
100 case PCI_CLOCK:
101 cmuclkmsk |= MSKPPCIU;
102 break;
103 case CEU_CLOCK:
104 cmuclkmsk2 |= MSKCEU;
105 break;
106 case ETHER0_CLOCK:
107 cmuclkmsk2 |= MSKMAC0;
108 break;
109 case ETHER1_CLOCK:
110 cmuclkmsk2 |= MSKMAC1;
111 break;
112 default:
113 break;
114 }
115
116 if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
117 clock == ETHER1_CLOCK)
118 cmu_write(CMUCLKMSK2, cmuclkmsk2);
119 else
120 cmu_write(CMUCLKMSK, cmuclkmsk);
121
122 spin_unlock_irq(&cmu_lock);
123 }
124
125 EXPORT_SYMBOL_GPL(vr41xx_supply_clock);
126
vr41xx_mask_clock(vr41xx_clock_t clock)127 void vr41xx_mask_clock(vr41xx_clock_t clock)
128 {
129 spin_lock_irq(&cmu_lock);
130
131 switch (clock) {
132 case PIU_CLOCK:
133 cmuclkmsk &= ~MSKPIU;
134 break;
135 case SIU_CLOCK:
136 if (current_cpu_type() == CPU_VR4111 ||
137 current_cpu_type() == CPU_VR4121) {
138 cmuclkmsk &= ~(MSKSIU | MSKSSIU);
139 } else {
140 if (cmuclkmsk & MSKDSIU)
141 cmuclkmsk &= ~MSKSSIU;
142 else
143 cmuclkmsk &= ~(MSKSIU | MSKSSIU);
144 }
145 break;
146 case AIU_CLOCK:
147 cmuclkmsk &= ~MSKAIU;
148 break;
149 case KIU_CLOCK:
150 cmuclkmsk &= ~MSKKIU;
151 break;
152 case FIR_CLOCK:
153 cmuclkmsk &= ~(MSKFIR | MSKFFIR);
154 break;
155 case DSIU_CLOCK:
156 if (current_cpu_type() == CPU_VR4111 ||
157 current_cpu_type() == CPU_VR4121) {
158 cmuclkmsk &= ~MSKDSIU;
159 } else {
160 if (cmuclkmsk & MSKSSIU)
161 cmuclkmsk &= ~MSKDSIU;
162 else
163 cmuclkmsk &= ~(MSKSIU | MSKDSIU);
164 }
165 break;
166 case CSI_CLOCK:
167 cmuclkmsk &= ~(MSKCSI | MSKSCSI);
168 break;
169 case PCIU_CLOCK:
170 cmuclkmsk &= ~MSKPCIU;
171 break;
172 case HSP_CLOCK:
173 cmuclkmsk &= ~MSKSHSP;
174 break;
175 case PCI_CLOCK:
176 cmuclkmsk &= ~MSKPPCIU;
177 break;
178 case CEU_CLOCK:
179 cmuclkmsk2 &= ~MSKCEU;
180 break;
181 case ETHER0_CLOCK:
182 cmuclkmsk2 &= ~MSKMAC0;
183 break;
184 case ETHER1_CLOCK:
185 cmuclkmsk2 &= ~MSKMAC1;
186 break;
187 default:
188 break;
189 }
190
191 if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
192 clock == ETHER1_CLOCK)
193 cmu_write(CMUCLKMSK2, cmuclkmsk2);
194 else
195 cmu_write(CMUCLKMSK, cmuclkmsk);
196
197 spin_unlock_irq(&cmu_lock);
198 }
199
200 EXPORT_SYMBOL_GPL(vr41xx_mask_clock);
201
vr41xx_cmu_init(void)202 static int __init vr41xx_cmu_init(void)
203 {
204 unsigned long start, size;
205
206 switch (current_cpu_type()) {
207 case CPU_VR4111:
208 case CPU_VR4121:
209 start = CMU_TYPE1_BASE;
210 size = CMU_TYPE1_SIZE;
211 break;
212 case CPU_VR4122:
213 case CPU_VR4131:
214 start = CMU_TYPE2_BASE;
215 size = CMU_TYPE2_SIZE;
216 break;
217 case CPU_VR4133:
218 start = CMU_TYPE3_BASE;
219 size = CMU_TYPE3_SIZE;
220 break;
221 default:
222 panic("Unexpected CPU of NEC VR4100 series");
223 break;
224 }
225
226 if (request_mem_region(start, size, "CMU") == NULL)
227 return -EBUSY;
228
229 cmu_base = ioremap(start, size);
230 if (cmu_base == NULL) {
231 release_mem_region(start, size);
232 return -EBUSY;
233 }
234
235 cmuclkmsk = cmu_read(CMUCLKMSK);
236 if (current_cpu_type() == CPU_VR4133)
237 cmuclkmsk2 = cmu_read(CMUCLKMSK2);
238
239 spin_lock_init(&cmu_lock);
240
241 return 0;
242 }
243
244 core_initcall(vr41xx_cmu_init);
245