Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * this file included by nicstar.c | |
3 | */ | |
4 | ||
5 | /* | |
6 | * nicstarmac.c | |
7 | * Read this ForeRunner's MAC address from eprom/eeprom | |
8 | */ | |
9 | ||
36fe55d6 AD |
10 | #include <linux/kernel.h> |
11 | ||
1da177e4 LT |
12 | typedef void __iomem *virt_addr_t; |
13 | ||
14 | #define CYCLE_DELAY 5 | |
15 | ||
16 | /* This was the original definition | |
17 | #define osp_MicroDelay(microsec) \ | |
18 | do { int _i = 4*microsec; while (--_i > 0) { __SLOW_DOWN_IO; }} while (0) | |
19 | */ | |
20 | #define osp_MicroDelay(microsec) {unsigned long useconds = (microsec); \ | |
21 | udelay((useconds));} | |
22 | ||
23 | ||
24 | /* The following tables represent the timing diagrams found in | |
25 | * the Data Sheet for the Xicor X25020 EEProm. The #defines below | |
26 | * represent the bits in the NICStAR's General Purpose register | |
27 | * that must be toggled for the corresponding actions on the EEProm | |
28 | * to occur. | |
29 | */ | |
30 | ||
31 | /* Write Data To EEProm from SI line on rising edge of CLK */ | |
32 | /* Read Data From EEProm on falling edge of CLK */ | |
33 | ||
34 | #define CS_HIGH 0x0002 /* Chip select high */ | |
35 | #define CS_LOW 0x0000 /* Chip select low (active low)*/ | |
36 | #define CLK_HIGH 0x0004 /* Clock high */ | |
37 | #define CLK_LOW 0x0000 /* Clock low */ | |
38 | #define SI_HIGH 0x0001 /* Serial input data high */ | |
39 | #define SI_LOW 0x0000 /* Serial input data low */ | |
40 | ||
41 | /* Read Status Register = 0000 0101b */ | |
42 | #if 0 | |
43 | static u_int32_t rdsrtab[] = | |
44 | { | |
45 | CS_HIGH | CLK_HIGH, | |
46 | CS_LOW | CLK_LOW, | |
47 | CLK_HIGH, /* 0 */ | |
48 | CLK_LOW, | |
49 | CLK_HIGH, /* 0 */ | |
50 | CLK_LOW, | |
51 | CLK_HIGH, /* 0 */ | |
52 | CLK_LOW, | |
53 | CLK_HIGH, /* 0 */ | |
54 | CLK_LOW, | |
55 | CLK_HIGH, /* 0 */ | |
56 | CLK_LOW | SI_HIGH, | |
57 | CLK_HIGH | SI_HIGH, /* 1 */ | |
58 | CLK_LOW | SI_LOW, | |
59 | CLK_HIGH, /* 0 */ | |
60 | CLK_LOW | SI_HIGH, | |
61 | CLK_HIGH | SI_HIGH /* 1 */ | |
62 | }; | |
63 | #endif /* 0 */ | |
64 | ||
65 | ||
66 | /* Read from EEPROM = 0000 0011b */ | |
67 | static u_int32_t readtab[] = | |
68 | { | |
69 | /* | |
70 | CS_HIGH | CLK_HIGH, | |
71 | */ | |
72 | CS_LOW | CLK_LOW, | |
73 | CLK_HIGH, /* 0 */ | |
74 | CLK_LOW, | |
75 | CLK_HIGH, /* 0 */ | |
76 | CLK_LOW, | |
77 | CLK_HIGH, /* 0 */ | |
78 | CLK_LOW, | |
79 | CLK_HIGH, /* 0 */ | |
80 | CLK_LOW, | |
81 | CLK_HIGH, /* 0 */ | |
82 | CLK_LOW, | |
83 | CLK_HIGH, /* 0 */ | |
84 | CLK_LOW | SI_HIGH, | |
85 | CLK_HIGH | SI_HIGH, /* 1 */ | |
86 | CLK_LOW | SI_HIGH, | |
87 | CLK_HIGH | SI_HIGH /* 1 */ | |
88 | }; | |
89 | ||
90 | ||
91 | /* Clock to read from/write to the eeprom */ | |
92 | static u_int32_t clocktab[] = | |
93 | { | |
94 | CLK_LOW, | |
95 | CLK_HIGH, | |
96 | CLK_LOW, | |
97 | CLK_HIGH, | |
98 | CLK_LOW, | |
99 | CLK_HIGH, | |
100 | CLK_LOW, | |
101 | CLK_HIGH, | |
102 | CLK_LOW, | |
103 | CLK_HIGH, | |
104 | CLK_LOW, | |
105 | CLK_HIGH, | |
106 | CLK_LOW, | |
107 | CLK_HIGH, | |
108 | CLK_LOW, | |
109 | CLK_HIGH, | |
110 | CLK_LOW | |
111 | }; | |
112 | ||
113 | ||
114 | #define NICSTAR_REG_WRITE(bs, reg, val) \ | |
115 | while ( readl(bs + STAT) & 0x0200 ) ; \ | |
116 | writel((val),(base)+(reg)) | |
117 | #define NICSTAR_REG_READ(bs, reg) \ | |
118 | readl((base)+(reg)) | |
119 | #define NICSTAR_REG_GENERAL_PURPOSE GP | |
120 | ||
121 | /* | |
122 | * This routine will clock the Read_Status_reg function into the X2520 | |
123 | * eeprom, then pull the result from bit 16 of the NicSTaR's General Purpose | |
124 | * register. | |
125 | */ | |
126 | #if 0 | |
127 | u_int32_t | |
128 | nicstar_read_eprom_status( virt_addr_t base ) | |
129 | { | |
130 | u_int32_t val; | |
131 | u_int32_t rbyte; | |
132 | int32_t i, j; | |
133 | ||
134 | /* Send read instruction */ | |
135 | val = NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE ) & 0xFFFFFFF0; | |
136 | ||
2db84a86 | 137 | for (i=0; i<ARRAY_SIZE(rdsrtab); i++) |
1da177e4 LT |
138 | { |
139 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
140 | (val | rdsrtab[i]) ); | |
141 | osp_MicroDelay( CYCLE_DELAY ); | |
142 | } | |
143 | ||
144 | /* Done sending instruction - now pull data off of bit 16, MSB first */ | |
145 | /* Data clocked out of eeprom on falling edge of clock */ | |
146 | ||
147 | rbyte = 0; | |
148 | for (i=7, j=0; i>=0; i--) | |
149 | { | |
150 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
151 | (val | clocktab[j++]) ); | |
152 | rbyte |= (((NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE) | |
153 | & 0x00010000) >> 16) << i); | |
154 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
155 | (val | clocktab[j++]) ); | |
156 | osp_MicroDelay( CYCLE_DELAY ); | |
157 | } | |
158 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, 2 ); | |
159 | osp_MicroDelay( CYCLE_DELAY ); | |
160 | return rbyte; | |
161 | } | |
162 | #endif /* 0 */ | |
163 | ||
164 | ||
165 | /* | |
166 | * This routine will clock the Read_data function into the X2520 | |
167 | * eeprom, followed by the address to read from, through the NicSTaR's General | |
168 | * Purpose register. | |
169 | */ | |
170 | ||
171 | static u_int8_t | |
172 | read_eprom_byte(virt_addr_t base, u_int8_t offset) | |
173 | { | |
174 | u_int32_t val = 0; | |
175 | int i,j=0; | |
176 | u_int8_t tempread = 0; | |
177 | ||
178 | val = NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE ) & 0xFFFFFFF0; | |
179 | ||
180 | /* Send READ instruction */ | |
36fe55d6 | 181 | for (i=0; i<ARRAY_SIZE(readtab); i++) |
1da177e4 LT |
182 | { |
183 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
184 | (val | readtab[i]) ); | |
185 | osp_MicroDelay( CYCLE_DELAY ); | |
186 | } | |
187 | ||
188 | /* Next, we need to send the byte address to read from */ | |
189 | for (i=7; i>=0; i--) | |
190 | { | |
191 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
192 | (val | clocktab[j++] | ((offset >> i) & 1) ) ); | |
193 | osp_MicroDelay(CYCLE_DELAY); | |
194 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
195 | (val | clocktab[j++] | ((offset >> i) & 1) ) ); | |
196 | osp_MicroDelay( CYCLE_DELAY ); | |
197 | } | |
198 | ||
199 | j = 0; | |
200 | ||
201 | /* Now, we can read data from the eeprom by clocking it in */ | |
202 | for (i=7; i>=0; i--) | |
203 | { | |
204 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
205 | (val | clocktab[j++]) ); | |
206 | osp_MicroDelay( CYCLE_DELAY ); | |
207 | tempread |= (((NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE ) | |
208 | & 0x00010000) >> 16) << i); | |
209 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, | |
210 | (val | clocktab[j++]) ); | |
211 | osp_MicroDelay( CYCLE_DELAY ); | |
212 | } | |
213 | ||
214 | NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, 2 ); | |
215 | osp_MicroDelay( CYCLE_DELAY ); | |
216 | return tempread; | |
217 | } | |
218 | ||
219 | ||
220 | static void | |
221 | nicstar_init_eprom( virt_addr_t base ) | |
222 | { | |
223 | u_int32_t val; | |
224 | ||
225 | /* | |
226 | * turn chip select off | |
227 | */ | |
228 | val = NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) & 0xFFFFFFF0; | |
229 | ||
230 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
231 | (val | CS_HIGH | CLK_HIGH)); | |
232 | osp_MicroDelay( CYCLE_DELAY ); | |
233 | ||
234 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
235 | (val | CS_HIGH | CLK_LOW)); | |
236 | osp_MicroDelay( CYCLE_DELAY ); | |
237 | ||
238 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
239 | (val | CS_HIGH | CLK_HIGH)); | |
240 | osp_MicroDelay( CYCLE_DELAY ); | |
241 | ||
242 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
243 | (val | CS_HIGH | CLK_LOW)); | |
244 | osp_MicroDelay( CYCLE_DELAY ); | |
245 | } | |
246 | ||
247 | ||
248 | /* | |
249 | * This routine will be the interface to the ReadPromByte function | |
250 | * above. | |
251 | */ | |
252 | ||
253 | static void | |
254 | nicstar_read_eprom( | |
255 | virt_addr_t base, | |
256 | u_int8_t prom_offset, | |
257 | u_int8_t *buffer, | |
258 | u_int32_t nbytes ) | |
259 | { | |
260 | u_int i; | |
261 | ||
262 | for (i=0; i<nbytes; i++) | |
263 | { | |
264 | buffer[i] = read_eprom_byte( base, prom_offset ); | |
265 | ++prom_offset; | |
266 | osp_MicroDelay( CYCLE_DELAY ); | |
267 | } | |
268 | } | |
269 | ||
270 | ||
271 | /* | |
272 | void osp_MicroDelay(int x) { | |
273 | ||
274 | } | |
275 | */ | |
276 |