1 /*
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.
5 *
6 * Copyright (c) 2004 Axis Communications AB.
7 */
8
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 <arch/hwregs/reg_map.h>
15 #include <arch/hwregs/reg_rdwr.h>
16 #include <arch/pinmux.h>
17 #include <arch/hwregs/pinmux_defs.h>
18
19 #undef DEBUG
20
21 #define PORT_PINS 18
22 #define PORTS 4
23
24 static char pins[PORTS][PORT_PINS];
25 static DEFINE_SPINLOCK(pinmux_lock);
26
27 static void crisv32_pinmux_set(int port);
28
29 int
crisv32_pinmux_init(void)30 crisv32_pinmux_init(void)
31 {
32 static int initialized = 0;
33
34 if (!initialized) {
35 reg_pinmux_rw_pa pa = REG_RD(pinmux, regi_pinmux, rw_pa);
36 initialized = 1;
37 pa.pa0 = pa.pa1 = pa.pa2 = pa.pa3 =
38 pa.pa4 = pa.pa5 = pa.pa6 = pa.pa7 = regk_pinmux_yes;
39 REG_WR(pinmux, regi_pinmux, rw_pa, pa);
40 crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio);
41 crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio);
42 crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio);
43 crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio);
44 }
45
46 return 0;
47 }
48
49 int
crisv32_pinmux_alloc(int port,int first_pin,int last_pin,enum pin_mode mode)50 crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode mode)
51 {
52 int i;
53 unsigned long flags;
54
55 crisv32_pinmux_init();
56
57 if (port > PORTS)
58 return -EINVAL;
59
60 spin_lock_irqsave(&pinmux_lock, flags);
61
62 for (i = first_pin; i <= last_pin; i++)
63 {
64 if ((pins[port][i] != pinmux_none) && (pins[port][i] != pinmux_gpio) &&
65 (pins[port][i] != mode))
66 {
67 spin_unlock_irqrestore(&pinmux_lock, flags);
68 #ifdef DEBUG
69 panic("Pinmux alloc failed!\n");
70 #endif
71 return -EPERM;
72 }
73 }
74
75 for (i = first_pin; i <= last_pin; i++)
76 pins[port][i] = mode;
77
78 crisv32_pinmux_set(port);
79
80 spin_unlock_irqrestore(&pinmux_lock, flags);
81
82 return 0;
83 }
84
85 int
crisv32_pinmux_alloc_fixed(enum fixed_function function)86 crisv32_pinmux_alloc_fixed(enum fixed_function function)
87 {
88 int ret = -EINVAL;
89 char saved[sizeof pins];
90 unsigned long flags;
91
92 spin_lock_irqsave(&pinmux_lock, flags);
93
94 /* Save internal data for recovery */
95 memcpy(saved, pins, sizeof pins);
96
97 reg_pinmux_rw_hwprot hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
98
99 switch(function)
100 {
101 case pinmux_ser1:
102 ret = crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed);
103 hwprot.ser1 = regk_pinmux_yes;
104 break;
105 case pinmux_ser2:
106 ret = crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed);
107 hwprot.ser2 = regk_pinmux_yes;
108 break;
109 case pinmux_ser3:
110 ret = crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed);
111 hwprot.ser3 = regk_pinmux_yes;
112 break;
113 case pinmux_sser0:
114 ret = crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed);
115 ret |= crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
116 hwprot.sser0 = regk_pinmux_yes;
117 break;
118 case pinmux_sser1:
119 ret = crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
120 hwprot.sser1 = regk_pinmux_yes;
121 break;
122 case pinmux_ata0:
123 ret = crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed);
124 ret |= crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed);
125 hwprot.ata0 = regk_pinmux_yes;
126 break;
127 case pinmux_ata1:
128 ret = crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
129 ret |= crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed);
130 hwprot.ata1 = regk_pinmux_yes;
131 break;
132 case pinmux_ata2:
133 ret = crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed);
134 ret |= crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed);
135 hwprot.ata2 = regk_pinmux_yes;
136 break;
137 case pinmux_ata3:
138 ret = crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed);
139 ret |= crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed);
140 hwprot.ata2 = regk_pinmux_yes;
141 break;
142 case pinmux_ata:
143 ret = crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed);
144 ret |= crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed);
145 hwprot.ata = regk_pinmux_yes;
146 break;
147 case pinmux_eth1:
148 ret = crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed);
149 hwprot.eth1 = regk_pinmux_yes;
150 hwprot.eth1_mgm = regk_pinmux_yes;
151 break;
152 case pinmux_timer:
153 ret = crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
154 hwprot.timer = regk_pinmux_yes;
155 spin_unlock_irqrestore(&pinmux_lock, flags);
156 return ret;
157 }
158
159 if (!ret)
160 REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
161 else
162 memcpy(pins, saved, sizeof pins);
163
164 spin_unlock_irqrestore(&pinmux_lock, flags);
165
166 return ret;
167 }
168
169 void
crisv32_pinmux_set(int port)170 crisv32_pinmux_set(int port)
171 {
172 int i;
173 int gpio_val = 0;
174 int iop_val = 0;
175
176 for (i = 0; i < PORT_PINS; i++)
177 {
178 if (pins[port][i] == pinmux_gpio)
179 gpio_val |= (1 << i);
180 else if (pins[port][i] == pinmux_iop)
181 iop_val |= (1 << i);
182 }
183
184 REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_gio + 8*port, gpio_val);
185 REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_iop + 8*port, iop_val);
186
187 #ifdef DEBUG
188 crisv32_pinmux_dump();
189 #endif
190 }
191
192 int
crisv32_pinmux_dealloc(int port,int first_pin,int last_pin)193 crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
194 {
195 int i;
196 unsigned long flags;
197
198 crisv32_pinmux_init();
199
200 if (port > PORTS)
201 return -EINVAL;
202
203 spin_lock_irqsave(&pinmux_lock, flags);
204
205 for (i = first_pin; i <= last_pin; i++)
206 pins[port][i] = pinmux_none;
207
208 crisv32_pinmux_set(port);
209 spin_unlock_irqrestore(&pinmux_lock, flags);
210
211 return 0;
212 }
213
214 void
crisv32_pinmux_dump(void)215 crisv32_pinmux_dump(void)
216 {
217 int i, j;
218
219 crisv32_pinmux_init();
220
221 for (i = 0; i < PORTS; i++)
222 {
223 printk("Port %c\n", 'B'+i);
224 for (j = 0; j < PORT_PINS; j++)
225 printk(" Pin %d = %d\n", j, pins[i][j]);
226 }
227 }
228
229 __initcall(crisv32_pinmux_init);
230