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9#include <linux/delay.h>
10#include <linux/slab.h>
11#include <linux/ioport.h>
12#include <linux/device.h>
13#include <linux/io.h>
14#include <linux/io-64-nonatomic-hi-lo.h>
15#include <linux/fsl/mc.h>
16
17#include "fsl-mc-private.h"
18
19
20
21
22#define MC_CMD_COMPLETION_TIMEOUT_MS 500
23
24
25
26
27
28#define MC_CMD_COMPLETION_POLLING_MIN_SLEEP_USECS 10
29#define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500
30
31static enum mc_cmd_status mc_cmd_hdr_read_status(struct fsl_mc_command *cmd)
32{
33 struct mc_cmd_header *hdr = (struct mc_cmd_header *)&cmd->header;
34
35 return (enum mc_cmd_status)hdr->status;
36}
37
38static u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd)
39{
40 struct mc_cmd_header *hdr = (struct mc_cmd_header *)&cmd->header;
41 u16 cmd_id = le16_to_cpu(hdr->cmd_id);
42
43 return cmd_id;
44}
45
46static int mc_status_to_error(enum mc_cmd_status status)
47{
48 static const int mc_status_to_error_map[] = {
49 [MC_CMD_STATUS_OK] = 0,
50 [MC_CMD_STATUS_AUTH_ERR] = -EACCES,
51 [MC_CMD_STATUS_NO_PRIVILEGE] = -EPERM,
52 [MC_CMD_STATUS_DMA_ERR] = -EIO,
53 [MC_CMD_STATUS_CONFIG_ERR] = -ENXIO,
54 [MC_CMD_STATUS_TIMEOUT] = -ETIMEDOUT,
55 [MC_CMD_STATUS_NO_RESOURCE] = -ENAVAIL,
56 [MC_CMD_STATUS_NO_MEMORY] = -ENOMEM,
57 [MC_CMD_STATUS_BUSY] = -EBUSY,
58 [MC_CMD_STATUS_UNSUPPORTED_OP] = -ENOTSUPP,
59 [MC_CMD_STATUS_INVALID_STATE] = -ENODEV,
60 };
61
62 if ((u32)status >= ARRAY_SIZE(mc_status_to_error_map))
63 return -EINVAL;
64
65 return mc_status_to_error_map[status];
66}
67
68static const char *mc_status_to_string(enum mc_cmd_status status)
69{
70 static const char *const status_strings[] = {
71 [MC_CMD_STATUS_OK] = "Command completed successfully",
72 [MC_CMD_STATUS_READY] = "Command ready to be processed",
73 [MC_CMD_STATUS_AUTH_ERR] = "Authentication error",
74 [MC_CMD_STATUS_NO_PRIVILEGE] = "No privilege",
75 [MC_CMD_STATUS_DMA_ERR] = "DMA or I/O error",
76 [MC_CMD_STATUS_CONFIG_ERR] = "Configuration error",
77 [MC_CMD_STATUS_TIMEOUT] = "Operation timed out",
78 [MC_CMD_STATUS_NO_RESOURCE] = "No resources",
79 [MC_CMD_STATUS_NO_MEMORY] = "No memory available",
80 [MC_CMD_STATUS_BUSY] = "Device is busy",
81 [MC_CMD_STATUS_UNSUPPORTED_OP] = "Unsupported operation",
82 [MC_CMD_STATUS_INVALID_STATE] = "Invalid state"
83 };
84
85 if ((unsigned int)status >= ARRAY_SIZE(status_strings))
86 return "Unknown MC error";
87
88 return status_strings[status];
89}
90
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96
97static inline void mc_write_command(struct fsl_mc_command __iomem *portal,
98 struct fsl_mc_command *cmd)
99{
100 int i;
101
102
103 for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++)
104
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107
108
109 writeq_relaxed(le64_to_cpu(cmd->params[i]), &portal->params[i]);
110
111
112 writeq(le64_to_cpu(cmd->header), &portal->header);
113}
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122
123
124static inline enum mc_cmd_status mc_read_response(struct fsl_mc_command __iomem
125 *portal,
126 struct fsl_mc_command *resp)
127{
128 int i;
129 enum mc_cmd_status status;
130
131
132 resp->header = cpu_to_le64(readq_relaxed(&portal->header));
133 status = mc_cmd_hdr_read_status(resp);
134 if (status != MC_CMD_STATUS_OK)
135 return status;
136
137
138 for (i = 0; i < MC_CMD_NUM_OF_PARAMS; i++)
139
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142
143
144 resp->params[i] =
145 cpu_to_le64(readq_relaxed(&portal->params[i]));
146
147 return status;
148}
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157
158static int mc_polling_wait_preemptible(struct fsl_mc_io *mc_io,
159 struct fsl_mc_command *cmd,
160 enum mc_cmd_status *mc_status)
161{
162 enum mc_cmd_status status;
163 unsigned long jiffies_until_timeout =
164 jiffies + msecs_to_jiffies(MC_CMD_COMPLETION_TIMEOUT_MS);
165
166
167
168
169 for (;;) {
170 status = mc_read_response(mc_io->portal_virt_addr, cmd);
171 if (status != MC_CMD_STATUS_READY)
172 break;
173
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176
177
178 usleep_range(MC_CMD_COMPLETION_POLLING_MIN_SLEEP_USECS,
179 MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
180
181 if (time_after_eq(jiffies, jiffies_until_timeout)) {
182 dev_dbg(mc_io->dev,
183 "MC command timed out (portal: %pa, dprc handle: %#x, command: %#x)\n",
184 &mc_io->portal_phys_addr,
185 (unsigned int)mc_cmd_hdr_read_token(cmd),
186 (unsigned int)mc_cmd_hdr_read_cmdid(cmd));
187
188 return -ETIMEDOUT;
189 }
190 }
191
192 *mc_status = status;
193 return 0;
194}
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202
203
204static int mc_polling_wait_atomic(struct fsl_mc_io *mc_io,
205 struct fsl_mc_command *cmd,
206 enum mc_cmd_status *mc_status)
207{
208 enum mc_cmd_status status;
209 unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000;
210
211 BUILD_BUG_ON((MC_CMD_COMPLETION_TIMEOUT_MS * 1000) %
212 MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS != 0);
213
214 for (;;) {
215 status = mc_read_response(mc_io->portal_virt_addr, cmd);
216 if (status != MC_CMD_STATUS_READY)
217 break;
218
219 udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
220 timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS;
221 if (timeout_usecs == 0) {
222 dev_dbg(mc_io->dev,
223 "MC command timed out (portal: %pa, dprc handle: %#x, command: %#x)\n",
224 &mc_io->portal_phys_addr,
225 (unsigned int)mc_cmd_hdr_read_token(cmd),
226 (unsigned int)mc_cmd_hdr_read_cmdid(cmd));
227
228 return -ETIMEDOUT;
229 }
230 }
231
232 *mc_status = status;
233 return 0;
234}
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242
243
244int mc_send_command(struct fsl_mc_io *mc_io, struct fsl_mc_command *cmd)
245{
246 int error;
247 enum mc_cmd_status status;
248 unsigned long irq_flags = 0;
249
250 if (in_irq() && !(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL))
251 return -EINVAL;
252
253 if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
254 spin_lock_irqsave(&mc_io->spinlock, irq_flags);
255 else
256 mutex_lock(&mc_io->mutex);
257
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259
260
261 mc_write_command(mc_io->portal_virt_addr, cmd);
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263
264
265
266 if (!(mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL))
267 error = mc_polling_wait_preemptible(mc_io, cmd, &status);
268 else
269 error = mc_polling_wait_atomic(mc_io, cmd, &status);
270
271 if (error < 0)
272 goto common_exit;
273
274 if (status != MC_CMD_STATUS_OK) {
275 dev_dbg(mc_io->dev,
276 "MC command failed: portal: %pa, dprc handle: %#x, command: %#x, status: %s (%#x)\n",
277 &mc_io->portal_phys_addr,
278 (unsigned int)mc_cmd_hdr_read_token(cmd),
279 (unsigned int)mc_cmd_hdr_read_cmdid(cmd),
280 mc_status_to_string(status),
281 (unsigned int)status);
282
283 error = mc_status_to_error(status);
284 goto common_exit;
285 }
286
287 error = 0;
288common_exit:
289 if (mc_io->flags & FSL_MC_IO_ATOMIC_CONTEXT_PORTAL)
290 spin_unlock_irqrestore(&mc_io->spinlock, irq_flags);
291 else
292 mutex_unlock(&mc_io->mutex);
293
294 return error;
295}
296EXPORT_SYMBOL_GPL(mc_send_command);
297