Commit | Line | Data |
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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 | ||
098fde11 C |
16 | /* |
17 | This was the original definition | |
1da177e4 LT |
18 | #define osp_MicroDelay(microsec) \ |
19 | do { int _i = 4*microsec; while (--_i > 0) { __SLOW_DOWN_IO; }} while (0) | |
20 | */ | |
21 | #define osp_MicroDelay(microsec) {unsigned long useconds = (microsec); \ | |
22 | udelay((useconds));} | |
098fde11 C |
23 | /* |
24 | * The following tables represent the timing diagrams found in | |
1da177e4 LT |
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 | ||
098fde11 C |
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 */ | |
1da177e4 LT |
40 | |
41 | /* Read Status Register = 0000 0101b */ | |
42 | #if 0 | |
098fde11 C |
43 | static u_int32_t rdsrtab[] = { |
44 | CS_HIGH | CLK_HIGH, | |
45 | CS_LOW | CLK_LOW, | |
46 | CLK_HIGH, /* 0 */ | |
47 | CLK_LOW, | |
48 | CLK_HIGH, /* 0 */ | |
49 | CLK_LOW, | |
50 | CLK_HIGH, /* 0 */ | |
51 | CLK_LOW, | |
52 | CLK_HIGH, /* 0 */ | |
53 | CLK_LOW, | |
54 | CLK_HIGH, /* 0 */ | |
55 | CLK_LOW | SI_HIGH, | |
56 | CLK_HIGH | SI_HIGH, /* 1 */ | |
57 | CLK_LOW | SI_LOW, | |
58 | CLK_HIGH, /* 0 */ | |
59 | CLK_LOW | SI_HIGH, | |
60 | CLK_HIGH | SI_HIGH /* 1 */ | |
1da177e4 | 61 | }; |
098fde11 | 62 | #endif /* 0 */ |
1da177e4 LT |
63 | |
64 | /* Read from EEPROM = 0000 0011b */ | |
098fde11 C |
65 | static u_int32_t readtab[] = { |
66 | /* | |
67 | CS_HIGH | CLK_HIGH, | |
68 | */ | |
69 | CS_LOW | CLK_LOW, | |
70 | CLK_HIGH, /* 0 */ | |
71 | CLK_LOW, | |
72 | CLK_HIGH, /* 0 */ | |
73 | CLK_LOW, | |
74 | CLK_HIGH, /* 0 */ | |
75 | CLK_LOW, | |
76 | CLK_HIGH, /* 0 */ | |
77 | CLK_LOW, | |
78 | CLK_HIGH, /* 0 */ | |
79 | CLK_LOW, | |
80 | CLK_HIGH, /* 0 */ | |
81 | CLK_LOW | SI_HIGH, | |
82 | CLK_HIGH | SI_HIGH, /* 1 */ | |
83 | CLK_LOW | SI_HIGH, | |
84 | CLK_HIGH | SI_HIGH /* 1 */ | |
1da177e4 LT |
85 | }; |
86 | ||
1da177e4 | 87 | /* Clock to read from/write to the eeprom */ |
098fde11 C |
88 | static u_int32_t clocktab[] = { |
89 | CLK_LOW, | |
90 | CLK_HIGH, | |
91 | CLK_LOW, | |
92 | CLK_HIGH, | |
93 | CLK_LOW, | |
94 | CLK_HIGH, | |
95 | CLK_LOW, | |
96 | CLK_HIGH, | |
97 | CLK_LOW, | |
98 | CLK_HIGH, | |
99 | CLK_LOW, | |
100 | CLK_HIGH, | |
101 | CLK_LOW, | |
102 | CLK_HIGH, | |
103 | CLK_LOW, | |
104 | CLK_HIGH, | |
105 | CLK_LOW | |
1da177e4 LT |
106 | }; |
107 | ||
1da177e4 LT |
108 | #define NICSTAR_REG_WRITE(bs, reg, val) \ |
109 | while ( readl(bs + STAT) & 0x0200 ) ; \ | |
110 | writel((val),(base)+(reg)) | |
111 | #define NICSTAR_REG_READ(bs, reg) \ | |
112 | readl((base)+(reg)) | |
113 | #define NICSTAR_REG_GENERAL_PURPOSE GP | |
114 | ||
115 | /* | |
116 | * This routine will clock the Read_Status_reg function into the X2520 | |
117 | * eeprom, then pull the result from bit 16 of the NicSTaR's General Purpose | |
118 | * register. | |
119 | */ | |
120 | #if 0 | |
098fde11 | 121 | u_int32_t nicstar_read_eprom_status(virt_addr_t base) |
1da177e4 | 122 | { |
098fde11 C |
123 | u_int32_t val; |
124 | u_int32_t rbyte; | |
125 | int32_t i, j; | |
126 | ||
127 | /* Send read instruction */ | |
128 | val = NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) & 0xFFFFFFF0; | |
129 | ||
130 | for (i = 0; i < ARRAY_SIZE(rdsrtab); i++) { | |
131 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
132 | (val | rdsrtab[i])); | |
133 | osp_MicroDelay(CYCLE_DELAY); | |
134 | } | |
135 | ||
136 | /* Done sending instruction - now pull data off of bit 16, MSB first */ | |
137 | /* Data clocked out of eeprom on falling edge of clock */ | |
138 | ||
139 | rbyte = 0; | |
140 | for (i = 7, j = 0; i >= 0; i--) { | |
141 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
142 | (val | clocktab[j++])); | |
143 | rbyte |= (((NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) | |
144 | & 0x00010000) >> 16) << i); | |
145 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
146 | (val | clocktab[j++])); | |
147 | osp_MicroDelay(CYCLE_DELAY); | |
148 | } | |
149 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, 2); | |
150 | osp_MicroDelay(CYCLE_DELAY); | |
151 | return rbyte; | |
1da177e4 | 152 | } |
098fde11 | 153 | #endif /* 0 */ |
1da177e4 LT |
154 | |
155 | /* | |
156 | * This routine will clock the Read_data function into the X2520 | |
157 | * eeprom, followed by the address to read from, through the NicSTaR's General | |
158 | * Purpose register. | |
159 | */ | |
098fde11 C |
160 | |
161 | static u_int8_t read_eprom_byte(virt_addr_t base, u_int8_t offset) | |
1da177e4 | 162 | { |
098fde11 C |
163 | u_int32_t val = 0; |
164 | int i, j = 0; | |
165 | u_int8_t tempread = 0; | |
166 | ||
167 | val = NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) & 0xFFFFFFF0; | |
168 | ||
169 | /* Send READ instruction */ | |
170 | for (i = 0; i < ARRAY_SIZE(readtab); i++) { | |
171 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
172 | (val | readtab[i])); | |
173 | osp_MicroDelay(CYCLE_DELAY); | |
174 | } | |
175 | ||
176 | /* Next, we need to send the byte address to read from */ | |
177 | for (i = 7; i >= 0; i--) { | |
178 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
179 | (val | clocktab[j++] | ((offset >> i) & 1))); | |
180 | osp_MicroDelay(CYCLE_DELAY); | |
181 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
182 | (val | clocktab[j++] | ((offset >> i) & 1))); | |
183 | osp_MicroDelay(CYCLE_DELAY); | |
184 | } | |
185 | ||
186 | j = 0; | |
187 | ||
188 | /* Now, we can read data from the eeprom by clocking it in */ | |
189 | for (i = 7; i >= 0; i--) { | |
190 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
191 | (val | clocktab[j++])); | |
192 | osp_MicroDelay(CYCLE_DELAY); | |
193 | tempread |= | |
194 | (((NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) | |
195 | & 0x00010000) >> 16) << i); | |
196 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, | |
197 | (val | clocktab[j++])); | |
198 | osp_MicroDelay(CYCLE_DELAY); | |
199 | } | |
200 | ||
201 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, 2); | |
202 | osp_MicroDelay(CYCLE_DELAY); | |
203 | return tempread; | |
1da177e4 LT |
204 | } |
205 | ||
098fde11 | 206 | static void nicstar_init_eprom(virt_addr_t base) |
1da177e4 | 207 | { |
098fde11 | 208 | u_int32_t val; |
1da177e4 | 209 | |
098fde11 C |
210 | /* |
211 | * turn chip select off | |
212 | */ | |
213 | val = NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) & 0xFFFFFFF0; | |
1da177e4 | 214 | |
098fde11 C |
215 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, |
216 | (val | CS_HIGH | CLK_HIGH)); | |
217 | osp_MicroDelay(CYCLE_DELAY); | |
1da177e4 | 218 | |
098fde11 C |
219 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, |
220 | (val | CS_HIGH | CLK_LOW)); | |
221 | osp_MicroDelay(CYCLE_DELAY); | |
1da177e4 | 222 | |
098fde11 C |
223 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, |
224 | (val | CS_HIGH | CLK_HIGH)); | |
225 | osp_MicroDelay(CYCLE_DELAY); | |
1da177e4 | 226 | |
098fde11 C |
227 | NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE, |
228 | (val | CS_HIGH | CLK_LOW)); | |
229 | osp_MicroDelay(CYCLE_DELAY); | |
1da177e4 LT |
230 | } |
231 | ||
1da177e4 LT |
232 | /* |
233 | * This routine will be the interface to the ReadPromByte function | |
234 | * above. | |
098fde11 | 235 | */ |
1da177e4 LT |
236 | |
237 | static void | |
098fde11 C |
238 | nicstar_read_eprom(virt_addr_t base, |
239 | u_int8_t prom_offset, u_int8_t * buffer, u_int32_t nbytes) | |
1da177e4 | 240 | { |
098fde11 | 241 | u_int i; |
1da177e4 | 242 | |
098fde11 C |
243 | for (i = 0; i < nbytes; i++) { |
244 | buffer[i] = read_eprom_byte(base, prom_offset); | |
245 | ++prom_offset; | |
246 | osp_MicroDelay(CYCLE_DELAY); | |
247 | } | |
1da177e4 | 248 | } |