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13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/spinlock.h>
18#include <linux/io.h>
19#include <linux/string.h>
20#include <asm/geode.h>
21#include <asm/olpc.h>
22
23#ifdef CONFIG_OPEN_FIRMWARE
24#include <asm/ofw.h>
25#endif
26
27struct olpc_platform_t olpc_platform_info;
28EXPORT_SYMBOL_GPL(olpc_platform_info);
29
30static DEFINE_SPINLOCK(ec_lock);
31
32
33#define EC_BASE_TIMEOUT 20
34
35
36static int ec_timeout = EC_BASE_TIMEOUT;
37
38static int __init olpc_ec_timeout_set(char *str)
39{
40 if (get_option(&str, &ec_timeout) != 1) {
41 ec_timeout = EC_BASE_TIMEOUT;
42 printk(KERN_ERR "olpc-ec: invalid argument to "
43 "'olpc_ec_timeout=', ignoring!\n");
44 }
45 printk(KERN_DEBUG "olpc-ec: using %d ms delay for EC commands.\n",
46 ec_timeout);
47 return 1;
48}
49__setup("olpc_ec_timeout=", olpc_ec_timeout_set);
50
51
52
53
54
55static inline unsigned int ibf_status(unsigned int port)
56{
57 return !!(inb(port) & 0x02);
58}
59
60static inline unsigned int obf_status(unsigned int port)
61{
62 return inb(port) & 0x01;
63}
64
65#define wait_on_ibf(p, d) __wait_on_ibf(__LINE__, (p), (d))
66static int __wait_on_ibf(unsigned int line, unsigned int port, int desired)
67{
68 unsigned int timeo;
69 int state = ibf_status(port);
70
71 for (timeo = ec_timeout; state != desired && timeo; timeo--) {
72 mdelay(1);
73 state = ibf_status(port);
74 }
75
76 if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
77 timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
78 printk(KERN_WARNING "olpc-ec: %d: waited %u ms for IBF!\n",
79 line, ec_timeout - timeo);
80 }
81
82 return !(state == desired);
83}
84
85#define wait_on_obf(p, d) __wait_on_obf(__LINE__, (p), (d))
86static int __wait_on_obf(unsigned int line, unsigned int port, int desired)
87{
88 unsigned int timeo;
89 int state = obf_status(port);
90
91 for (timeo = ec_timeout; state != desired && timeo; timeo--) {
92 mdelay(1);
93 state = obf_status(port);
94 }
95
96 if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
97 timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
98 printk(KERN_WARNING "olpc-ec: %d: waited %u ms for OBF!\n",
99 line, ec_timeout - timeo);
100 }
101
102 return !(state == desired);
103}
104
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106
107
108
109
110
111
112int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
113 unsigned char *outbuf, size_t outlen)
114{
115 unsigned long flags;
116 int ret = -EIO;
117 int i;
118
119 spin_lock_irqsave(&ec_lock, flags);
120
121
122 for (i = 0; i < 10 && (obf_status(0x6c) == 1); i++)
123 inb(0x68);
124 if (i == 10) {
125 printk(KERN_ERR "olpc-ec: timeout while attempting to "
126 "clear OBF flag!\n");
127 goto err;
128 }
129
130 if (wait_on_ibf(0x6c, 0)) {
131 printk(KERN_ERR "olpc-ec: timeout waiting for EC to "
132 "quiesce!\n");
133 goto err;
134 }
135
136restart:
137
138
139
140
141
142
143
144
145
146 printk(KERN_DEBUG "olpc-ec: running cmd 0x%x\n", cmd);
147 outb(cmd, 0x6c);
148
149 if (wait_on_ibf(0x6c, 0)) {
150 printk(KERN_ERR "olpc-ec: timeout waiting for EC to read "
151 "command!\n");
152 goto err;
153 }
154
155 if (inbuf && inlen) {
156
157 for (i = 0; i < inlen; i++) {
158 if (wait_on_ibf(0x6c, 0)) {
159 printk(KERN_ERR "olpc-ec: timeout waiting for"
160 " EC accept data!\n");
161 goto err;
162 }
163 printk(KERN_DEBUG "olpc-ec: sending cmd arg 0x%x\n",
164 inbuf[i]);
165 outb(inbuf[i], 0x68);
166 }
167 }
168 if (outbuf && outlen) {
169
170 for (i = 0; i < outlen; i++) {
171 if (wait_on_obf(0x6c, 1)) {
172 printk(KERN_ERR "olpc-ec: timeout waiting for"
173 " EC to provide data!\n");
174 goto restart;
175 }
176 outbuf[i] = inb(0x68);
177 printk(KERN_DEBUG "olpc-ec: received 0x%x\n",
178 outbuf[i]);
179 }
180 }
181
182 ret = 0;
183err:
184 spin_unlock_irqrestore(&ec_lock, flags);
185 return ret;
186}
187EXPORT_SYMBOL_GPL(olpc_ec_cmd);
188
189#ifdef CONFIG_OPEN_FIRMWARE
190static void __init platform_detect(void)
191{
192 size_t propsize;
193 __be32 rev;
194
195 if (ofw("getprop", 4, 1, NULL, "board-revision-int", &rev, 4,
196 &propsize) || propsize != 4) {
197 printk(KERN_ERR "ofw: getprop call failed!\n");
198 rev = cpu_to_be32(0);
199 }
200 olpc_platform_info.boardrev = be32_to_cpu(rev);
201}
202#else
203static void __init platform_detect(void)
204{
205
206 olpc_platform_info.boardrev = olpc_board(0xc2);
207}
208#endif
209
210static int __init olpc_init(void)
211{
212 unsigned char *romsig;
213
214
215 if (!is_geode() || geode_has_vsa2())
216 return 0;
217
218 spin_lock_init(&ec_lock);
219
220 romsig = ioremap(0xffffffc0, 16);
221 if (!romsig)
222 return 0;
223
224 if (strncmp(romsig, "CL1 Q", 7))
225 goto unmap;
226 if (strncmp(romsig+6, romsig+13, 3)) {
227 printk(KERN_INFO "OLPC BIOS signature looks invalid. "
228 "Assuming not OLPC\n");
229 goto unmap;
230 }
231
232 printk(KERN_INFO "OLPC board with OpenFirmware %.16s\n", romsig);
233 olpc_platform_info.flags |= OLPC_F_PRESENT;
234
235
236 platform_detect();
237
238
239 if (olpc_board_at_least(olpc_board(0xb1)))
240 olpc_platform_info.flags |= OLPC_F_DCON;
241
242
243 olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0,
244 (unsigned char *) &olpc_platform_info.ecver, 1);
245
246
247 if (geode_has_vsa2())
248 olpc_platform_info.flags |= OLPC_F_VSA;
249
250 printk(KERN_INFO "OLPC board revision %s%X (EC=%x)\n",
251 ((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
252 olpc_platform_info.boardrev >> 4,
253 olpc_platform_info.ecver);
254
255unmap:
256 iounmap(romsig);
257 return 0;
258}
259
260postcore_initcall(olpc_init);
261
