1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Allocator for I/O pins. All pins are allocated to GPIO at bootup.
4 * Unassigned pins and GPIO pins can be allocated to a fixed interface
5 * or the I/O processor instead.
6 *
7 * Copyright (c) 2004-2007 Axis Communications AB.
8 */
9
10 #include <linux/init.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/spinlock.h>
15 #include <hwregs/reg_map.h>
16 #include <hwregs/reg_rdwr.h>
17 #include <pinmux.h>
18 #include <hwregs/pinmux_defs.h>
19
20 #undef DEBUG
21
22 #define PORT_PINS 18
23 #define PORTS 4
24
25 static char pins[PORTS][PORT_PINS];
26 static DEFINE_SPINLOCK(pinmux_lock);
27
28 static void crisv32_pinmux_set(int port);
29
__crisv32_pinmux_alloc(int port,int first_pin,int last_pin,enum pin_mode mode)30 static int __crisv32_pinmux_alloc(int port, int first_pin, int last_pin,
31 enum pin_mode mode)
32 {
33 int i;
34
35 for (i = first_pin; i <= last_pin; i++) {
36 if ((pins[port][i] != pinmux_none)
37 && (pins[port][i] != pinmux_gpio)
38 && (pins[port][i] != mode)) {
39 #ifdef DEBUG
40 panic("Pinmux alloc failed!\n");
41 #endif
42 return -EPERM;
43 }
44 }
45
46 for (i = first_pin; i <= last_pin; i++)
47 pins[port][i] = mode;
48
49 crisv32_pinmux_set(port);
50
51 return 0;
52 }
53
crisv32_pinmux_init(void)54 static int crisv32_pinmux_init(void)
55 {
56 static int initialized;
57
58 if (!initialized) {
59 reg_pinmux_rw_pa pa = REG_RD(pinmux, regi_pinmux, rw_pa);
60 initialized = 1;
61 REG_WR_INT(pinmux, regi_pinmux, rw_hwprot, 0);
62 pa.pa0 = pa.pa1 = pa.pa2 = pa.pa3 =
63 pa.pa4 = pa.pa5 = pa.pa6 = pa.pa7 = regk_pinmux_yes;
64 REG_WR(pinmux, regi_pinmux, rw_pa, pa);
65 __crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio);
66 __crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio);
67 __crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio);
68 __crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio);
69 }
70
71 return 0;
72 }
73
crisv32_pinmux_alloc(int port,int first_pin,int last_pin,enum pin_mode mode)74 int crisv32_pinmux_alloc(int port, int first_pin, int last_pin,
75 enum pin_mode mode)
76 {
77 unsigned long flags;
78 int ret;
79
80 crisv32_pinmux_init();
81
82 if (port > PORTS || port < 0)
83 return -EINVAL;
84
85 spin_lock_irqsave(&pinmux_lock, flags);
86
87 ret = __crisv32_pinmux_alloc(port, first_pin, last_pin, mode);
88
89 spin_unlock_irqrestore(&pinmux_lock, flags);
90
91 return ret;
92 }
93
crisv32_pinmux_alloc_fixed(enum fixed_function function)94 int crisv32_pinmux_alloc_fixed(enum fixed_function function)
95 {
96 int ret = -EINVAL;
97 char saved[sizeof pins];
98 unsigned long flags;
99 reg_pinmux_rw_hwprot hwprot;
100
101 spin_lock_irqsave(&pinmux_lock, flags);
102
103 /* Save internal data for recovery */
104 memcpy(saved, pins, sizeof pins);
105
106 crisv32_pinmux_init(); /* Must be done before we read rw_hwprot */
107
108 hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
109
110 switch (function) {
111 case pinmux_ser1:
112 ret = __crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed);
113 hwprot.ser1 = regk_pinmux_yes;
114 break;
115 case pinmux_ser2:
116 ret = __crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed);
117 hwprot.ser2 = regk_pinmux_yes;
118 break;
119 case pinmux_ser3:
120 ret = __crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed);
121 hwprot.ser3 = regk_pinmux_yes;
122 break;
123 case pinmux_sser0:
124 ret = __crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed);
125 ret |= __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
126 hwprot.sser0 = regk_pinmux_yes;
127 break;
128 case pinmux_sser1:
129 ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
130 hwprot.sser1 = regk_pinmux_yes;
131 break;
132 case pinmux_ata0:
133 ret = __crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed);
134 ret |= __crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed);
135 hwprot.ata0 = regk_pinmux_yes;
136 break;
137 case pinmux_ata1:
138 ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
139 ret |= __crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed);
140 hwprot.ata1 = regk_pinmux_yes;
141 break;
142 case pinmux_ata2:
143 ret = __crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed);
144 ret |= __crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed);
145 hwprot.ata2 = regk_pinmux_yes;
146 break;
147 case pinmux_ata3:
148 ret = __crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed);
149 ret |= __crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed);
150 hwprot.ata2 = regk_pinmux_yes;
151 break;
152 case pinmux_ata:
153 ret = __crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed);
154 ret |= __crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed);
155 hwprot.ata = regk_pinmux_yes;
156 break;
157 case pinmux_eth1:
158 ret = __crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed);
159 hwprot.eth1 = regk_pinmux_yes;
160 hwprot.eth1_mgm = regk_pinmux_yes;
161 break;
162 case pinmux_timer:
163 ret = __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
164 hwprot.timer = regk_pinmux_yes;
165 spin_unlock_irqrestore(&pinmux_lock, flags);
166 return ret;
167 }
168
169 if (!ret)
170 REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
171 else
172 memcpy(pins, saved, sizeof pins);
173
174 spin_unlock_irqrestore(&pinmux_lock, flags);
175
176 return ret;
177 }
178
crisv32_pinmux_set(int port)179 void crisv32_pinmux_set(int port)
180 {
181 int i;
182 int gpio_val = 0;
183 int iop_val = 0;
184
185 for (i = 0; i < PORT_PINS; i++) {
186 if (pins[port][i] == pinmux_gpio)
187 gpio_val |= (1 << i);
188 else if (pins[port][i] == pinmux_iop)
189 iop_val |= (1 << i);
190 }
191
192 REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_gio + 8 * port,
193 gpio_val);
194 REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_iop + 8 * port,
195 iop_val);
196
197 #ifdef DEBUG
198 crisv32_pinmux_dump();
199 #endif
200 }
201
__crisv32_pinmux_dealloc(int port,int first_pin,int last_pin)202 static int __crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
203 {
204 int i;
205
206 for (i = first_pin; i <= last_pin; i++)
207 pins[port][i] = pinmux_none;
208
209 crisv32_pinmux_set(port);
210 return 0;
211 }
212
crisv32_pinmux_dealloc(int port,int first_pin,int last_pin)213 int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
214 {
215 unsigned long flags;
216
217 crisv32_pinmux_init();
218
219 if (port > PORTS || port < 0)
220 return -EINVAL;
221
222 spin_lock_irqsave(&pinmux_lock, flags);
223 __crisv32_pinmux_dealloc(port, first_pin, last_pin);
224 spin_unlock_irqrestore(&pinmux_lock, flags);
225
226 return 0;
227 }
228
crisv32_pinmux_dealloc_fixed(enum fixed_function function)229 int crisv32_pinmux_dealloc_fixed(enum fixed_function function)
230 {
231 int ret = -EINVAL;
232 char saved[sizeof pins];
233 unsigned long flags;
234 reg_pinmux_rw_hwprot hwprot;
235
236 spin_lock_irqsave(&pinmux_lock, flags);
237
238 /* Save internal data for recovery */
239 memcpy(saved, pins, sizeof pins);
240
241 crisv32_pinmux_init(); /* Must be done before we read rw_hwprot */
242
243 hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
244
245 switch (function) {
246 case pinmux_ser1:
247 ret = __crisv32_pinmux_dealloc(PORT_C, 4, 7);
248 hwprot.ser1 = regk_pinmux_no;
249 break;
250 case pinmux_ser2:
251 ret = __crisv32_pinmux_dealloc(PORT_C, 8, 11);
252 hwprot.ser2 = regk_pinmux_no;
253 break;
254 case pinmux_ser3:
255 ret = __crisv32_pinmux_dealloc(PORT_C, 12, 15);
256 hwprot.ser3 = regk_pinmux_no;
257 break;
258 case pinmux_sser0:
259 ret = __crisv32_pinmux_dealloc(PORT_C, 0, 3);
260 ret |= __crisv32_pinmux_dealloc(PORT_C, 16, 16);
261 hwprot.sser0 = regk_pinmux_no;
262 break;
263 case pinmux_sser1:
264 ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4);
265 hwprot.sser1 = regk_pinmux_no;
266 break;
267 case pinmux_ata0:
268 ret = __crisv32_pinmux_dealloc(PORT_D, 5, 7);
269 ret |= __crisv32_pinmux_dealloc(PORT_D, 15, 17);
270 hwprot.ata0 = regk_pinmux_no;
271 break;
272 case pinmux_ata1:
273 ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4);
274 ret |= __crisv32_pinmux_dealloc(PORT_E, 17, 17);
275 hwprot.ata1 = regk_pinmux_no;
276 break;
277 case pinmux_ata2:
278 ret = __crisv32_pinmux_dealloc(PORT_C, 11, 15);
279 ret |= __crisv32_pinmux_dealloc(PORT_E, 3, 3);
280 hwprot.ata2 = regk_pinmux_no;
281 break;
282 case pinmux_ata3:
283 ret = __crisv32_pinmux_dealloc(PORT_C, 8, 10);
284 ret |= __crisv32_pinmux_dealloc(PORT_C, 0, 2);
285 hwprot.ata2 = regk_pinmux_no;
286 break;
287 case pinmux_ata:
288 ret = __crisv32_pinmux_dealloc(PORT_B, 0, 15);
289 ret |= __crisv32_pinmux_dealloc(PORT_D, 8, 15);
290 hwprot.ata = regk_pinmux_no;
291 break;
292 case pinmux_eth1:
293 ret = __crisv32_pinmux_dealloc(PORT_E, 0, 17);
294 hwprot.eth1 = regk_pinmux_no;
295 hwprot.eth1_mgm = regk_pinmux_no;
296 break;
297 case pinmux_timer:
298 ret = __crisv32_pinmux_dealloc(PORT_C, 16, 16);
299 hwprot.timer = regk_pinmux_no;
300 spin_unlock_irqrestore(&pinmux_lock, flags);
301 return ret;
302 }
303
304 if (!ret)
305 REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
306 else
307 memcpy(pins, saved, sizeof pins);
308
309 spin_unlock_irqrestore(&pinmux_lock, flags);
310
311 return ret;
312 }
313
314 #ifdef DEBUG
crisv32_pinmux_dump(void)315 static void crisv32_pinmux_dump(void)
316 {
317 int i, j;
318
319 crisv32_pinmux_init();
320
321 for (i = 0; i < PORTS; i++) {
322 printk(KERN_DEBUG "Port %c\n", 'B' + i);
323 for (j = 0; j < PORT_PINS; j++)
324 printk(KERN_DEBUG " Pin %d = %d\n", j, pins[i][j]);
325 }
326 }
327 #endif
328 __initcall(crisv32_pinmux_init);
329