2 * Allocator for I/O pins. All pins are allocated to GPIO at bootup.
3 * Unassigned pins and GPIO pins can be allocated to a fixed interface
4 * or the I/O processor instead.
6 * Copyright (c) 2004-2007 Axis Communications AB.
9 #include <linux/init.h>
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/spinlock.h>
14 #include <hwregs/reg_map.h>
15 #include <hwregs/reg_rdwr.h>
17 #include <hwregs/pinmux_defs.h>
24 static char pins[PORTS][PORT_PINS];
25 static DEFINE_SPINLOCK(pinmux_lock);
27 static void crisv32_pinmux_set(int port);
29 static int __crisv32_pinmux_alloc(int port, int first_pin, int last_pin,
34 for (i = first_pin; i <= last_pin; i++) {
35 if ((pins[port][i] != pinmux_none)
36 && (pins[port][i] != pinmux_gpio)
37 && (pins[port][i] != mode)) {
39 panic("Pinmux alloc failed!\n");
45 for (i = first_pin; i <= last_pin; i++)
48 crisv32_pinmux_set(port);
53 static int crisv32_pinmux_init(void)
55 static int initialized;
58 reg_pinmux_rw_pa pa = REG_RD(pinmux, regi_pinmux, rw_pa);
60 REG_WR_INT(pinmux, regi_pinmux, rw_hwprot, 0);
61 pa.pa0 = pa.pa1 = pa.pa2 = pa.pa3 =
62 pa.pa4 = pa.pa5 = pa.pa6 = pa.pa7 = regk_pinmux_yes;
63 REG_WR(pinmux, regi_pinmux, rw_pa, pa);
64 __crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio);
65 __crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio);
66 __crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio);
67 __crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio);
73 int crisv32_pinmux_alloc(int port, int first_pin, int last_pin,
79 crisv32_pinmux_init();
81 if (port > PORTS || port < 0)
84 spin_lock_irqsave(&pinmux_lock, flags);
86 ret = __crisv32_pinmux_alloc(port, first_pin, last_pin, mode);
88 spin_unlock_irqrestore(&pinmux_lock, flags);
93 int crisv32_pinmux_alloc_fixed(enum fixed_function function)
96 char saved[sizeof pins];
98 reg_pinmux_rw_hwprot hwprot;
100 spin_lock_irqsave(&pinmux_lock, flags);
102 /* Save internal data for recovery */
103 memcpy(saved, pins, sizeof pins);
105 crisv32_pinmux_init(); /* Must be done before we read rw_hwprot */
107 hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
111 ret = __crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed);
112 hwprot.ser1 = regk_pinmux_yes;
115 ret = __crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed);
116 hwprot.ser2 = regk_pinmux_yes;
119 ret = __crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed);
120 hwprot.ser3 = regk_pinmux_yes;
123 ret = __crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed);
124 ret |= __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
125 hwprot.sser0 = regk_pinmux_yes;
128 ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
129 hwprot.sser1 = regk_pinmux_yes;
132 ret = __crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed);
133 ret |= __crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed);
134 hwprot.ata0 = regk_pinmux_yes;
137 ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
138 ret |= __crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed);
139 hwprot.ata1 = regk_pinmux_yes;
142 ret = __crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed);
143 ret |= __crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed);
144 hwprot.ata2 = regk_pinmux_yes;
147 ret = __crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed);
148 ret |= __crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed);
149 hwprot.ata2 = regk_pinmux_yes;
152 ret = __crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed);
153 ret |= __crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed);
154 hwprot.ata = regk_pinmux_yes;
157 ret = __crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed);
158 hwprot.eth1 = regk_pinmux_yes;
159 hwprot.eth1_mgm = regk_pinmux_yes;
162 ret = __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
163 hwprot.timer = regk_pinmux_yes;
164 spin_unlock_irqrestore(&pinmux_lock, flags);
169 REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
171 memcpy(pins, saved, sizeof pins);
173 spin_unlock_irqrestore(&pinmux_lock, flags);
178 void crisv32_pinmux_set(int port)
184 for (i = 0; i < PORT_PINS; i++) {
185 if (pins[port][i] == pinmux_gpio)
186 gpio_val |= (1 << i);
187 else if (pins[port][i] == pinmux_iop)
191 REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_gio + 8 * port,
193 REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_iop + 8 * port,
197 crisv32_pinmux_dump();
201 static int __crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
205 for (i = first_pin; i <= last_pin; i++)
206 pins[port][i] = pinmux_none;
208 crisv32_pinmux_set(port);
212 int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
216 crisv32_pinmux_init();
218 if (port > PORTS || port < 0)
221 spin_lock_irqsave(&pinmux_lock, flags);
222 __crisv32_pinmux_dealloc(port, first_pin, last_pin);
223 spin_unlock_irqrestore(&pinmux_lock, flags);
228 int crisv32_pinmux_dealloc_fixed(enum fixed_function function)
231 char saved[sizeof pins];
233 reg_pinmux_rw_hwprot hwprot;
235 spin_lock_irqsave(&pinmux_lock, flags);
237 /* Save internal data for recovery */
238 memcpy(saved, pins, sizeof pins);
240 crisv32_pinmux_init(); /* Must be done before we read rw_hwprot */
242 hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
246 ret = __crisv32_pinmux_dealloc(PORT_C, 4, 7);
247 hwprot.ser1 = regk_pinmux_no;
250 ret = __crisv32_pinmux_dealloc(PORT_C, 8, 11);
251 hwprot.ser2 = regk_pinmux_no;
254 ret = __crisv32_pinmux_dealloc(PORT_C, 12, 15);
255 hwprot.ser3 = regk_pinmux_no;
258 ret = __crisv32_pinmux_dealloc(PORT_C, 0, 3);
259 ret |= __crisv32_pinmux_dealloc(PORT_C, 16, 16);
260 hwprot.sser0 = regk_pinmux_no;
263 ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4);
264 hwprot.sser1 = regk_pinmux_no;
267 ret = __crisv32_pinmux_dealloc(PORT_D, 5, 7);
268 ret |= __crisv32_pinmux_dealloc(PORT_D, 15, 17);
269 hwprot.ata0 = regk_pinmux_no;
272 ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4);
273 ret |= __crisv32_pinmux_dealloc(PORT_E, 17, 17);
274 hwprot.ata1 = regk_pinmux_no;
277 ret = __crisv32_pinmux_dealloc(PORT_C, 11, 15);
278 ret |= __crisv32_pinmux_dealloc(PORT_E, 3, 3);
279 hwprot.ata2 = regk_pinmux_no;
282 ret = __crisv32_pinmux_dealloc(PORT_C, 8, 10);
283 ret |= __crisv32_pinmux_dealloc(PORT_C, 0, 2);
284 hwprot.ata2 = regk_pinmux_no;
287 ret = __crisv32_pinmux_dealloc(PORT_B, 0, 15);
288 ret |= __crisv32_pinmux_dealloc(PORT_D, 8, 15);
289 hwprot.ata = regk_pinmux_no;
292 ret = __crisv32_pinmux_dealloc(PORT_E, 0, 17);
293 hwprot.eth1 = regk_pinmux_no;
294 hwprot.eth1_mgm = regk_pinmux_no;
297 ret = __crisv32_pinmux_dealloc(PORT_C, 16, 16);
298 hwprot.timer = regk_pinmux_no;
299 spin_unlock_irqrestore(&pinmux_lock, flags);
304 REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
306 memcpy(pins, saved, sizeof pins);
308 spin_unlock_irqrestore(&pinmux_lock, flags);
314 static void crisv32_pinmux_dump(void)
318 crisv32_pinmux_init();
320 for (i = 0; i < PORTS; i++) {
321 printk(KERN_DEBUG "Port %c\n", 'B' + i);
322 for (j = 0; j < PORT_PINS; j++)
323 printk(KERN_DEBUG " Pin %d = %d\n", j, pins[i][j]);
327 __initcall(crisv32_pinmux_init);