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3e00a5ae BH |
1 | /* |
2 | * RackMac vu-meter driver | |
3 | * | |
4 | * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp. | |
5 | * <benh@kernel.crashing.org> | |
6 | * | |
7 | * Released under the term of the GNU GPL v2. | |
8 | * | |
9 | * Support the CPU-meter LEDs of the Xserve G5 | |
10 | * | |
11 | * TODO: Implement PWM to do variable intensity and provide userland | |
12 | * interface for fun. Also, the CPU-meter could be made nicer by being | |
13 | * a bit less "immediate" but giving instead a more average load over | |
14 | * time. Patches welcome :-) | |
15 | * | |
16 | */ | |
17 | #undef DEBUG | |
18 | ||
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/pci.h> | |
25 | #include <linux/dma-mapping.h> | |
26 | #include <linux/kernel_stat.h> | |
27 | ||
28 | #include <asm/io.h> | |
29 | #include <asm/prom.h> | |
30 | #include <asm/machdep.h> | |
31 | #include <asm/pmac_feature.h> | |
32 | #include <asm/dbdma.h> | |
3e00a5ae BH |
33 | #include <asm/macio.h> |
34 | #include <asm/keylargo.h> | |
35 | ||
36 | /* Number of samples in a sample buffer */ | |
37 | #define SAMPLE_COUNT 256 | |
38 | ||
39 | /* CPU meter sampling rate in ms */ | |
40 | #define CPU_SAMPLING_RATE 250 | |
41 | ||
42 | struct rackmeter_dma { | |
43 | struct dbdma_cmd cmd[4] ____cacheline_aligned; | |
44 | u32 mark ____cacheline_aligned; | |
45 | u32 buf1[SAMPLE_COUNT] ____cacheline_aligned; | |
46 | u32 buf2[SAMPLE_COUNT] ____cacheline_aligned; | |
47 | } ____cacheline_aligned; | |
48 | ||
49 | struct rackmeter_cpu { | |
6d5aefb8 DH |
50 | struct delayed_work sniffer; |
51 | struct rackmeter *rm; | |
3e00a5ae BH |
52 | cputime64_t prev_wall; |
53 | cputime64_t prev_idle; | |
54 | int zero; | |
55 | } ____cacheline_aligned; | |
56 | ||
57 | struct rackmeter { | |
58 | struct macio_dev *mdev; | |
59 | unsigned int irq; | |
60 | struct device_node *i2s; | |
61 | u8 *ubuf; | |
62 | struct dbdma_regs __iomem *dma_regs; | |
63 | void __iomem *i2s_regs; | |
64 | dma_addr_t dma_buf_p; | |
65 | struct rackmeter_dma *dma_buf_v; | |
66 | int stale_irq; | |
67 | struct rackmeter_cpu cpu[2]; | |
68 | int paused; | |
69 | struct mutex sem; | |
70 | }; | |
71 | ||
72 | /* To be set as a tunable */ | |
73 | static int rackmeter_ignore_nice; | |
74 | ||
75 | /* This GPIO is whacked by the OS X driver when initializing */ | |
76 | #define RACKMETER_MAGIC_GPIO 0x78 | |
77 | ||
78 | /* This is copied from cpufreq_ondemand, maybe we should put it in | |
79 | * a common header somewhere | |
80 | */ | |
81 | static inline cputime64_t get_cpu_idle_time(unsigned int cpu) | |
82 | { | |
83 | cputime64_t retval; | |
84 | ||
85 | retval = cputime64_add(kstat_cpu(cpu).cpustat.idle, | |
86 | kstat_cpu(cpu).cpustat.iowait); | |
87 | ||
88 | if (rackmeter_ignore_nice) | |
89 | retval = cputime64_add(retval, kstat_cpu(cpu).cpustat.nice); | |
90 | ||
91 | return retval; | |
92 | } | |
93 | ||
94 | static void rackmeter_setup_i2s(struct rackmeter *rm) | |
95 | { | |
96 | struct macio_chip *macio = rm->mdev->bus->chip; | |
97 | ||
98 | /* First whack magic GPIO */ | |
99 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5); | |
100 | ||
101 | ||
102 | /* Call feature code to enable the sound channel and the proper | |
103 | * clock sources | |
104 | */ | |
105 | pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1); | |
106 | ||
107 | /* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now. | |
108 | * This is a bit racy, thus we should add new platform functions to | |
109 | * handle that. snd-aoa needs that too | |
110 | */ | |
111 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE); | |
112 | MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT); | |
113 | (void)MACIO_IN32(KEYLARGO_FCR1); | |
114 | udelay(10); | |
115 | ||
116 | /* Then setup i2s. For now, we use the same magic value that | |
117 | * the OS X driver seems to use. We might want to play around | |
118 | * with the clock divisors later | |
119 | */ | |
120 | out_le32(rm->i2s_regs + 0x10, 0x01fa0000); | |
121 | (void)in_le32(rm->i2s_regs + 0x10); | |
122 | udelay(10); | |
123 | ||
124 | /* Fully restart i2s*/ | |
125 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE | | |
126 | KL1_I2S0_CLK_ENABLE_BIT); | |
127 | (void)MACIO_IN32(KEYLARGO_FCR1); | |
128 | udelay(10); | |
129 | } | |
130 | ||
131 | static void rackmeter_set_default_pattern(struct rackmeter *rm) | |
132 | { | |
133 | int i; | |
134 | ||
135 | for (i = 0; i < 16; i++) { | |
136 | if (i < 8) | |
137 | rm->ubuf[i] = (i & 1) * 255; | |
138 | else | |
139 | rm->ubuf[i] = ((~i) & 1) * 255; | |
140 | } | |
141 | } | |
142 | ||
143 | static void rackmeter_do_pause(struct rackmeter *rm, int pause) | |
144 | { | |
145 | struct rackmeter_dma *rdma = rm->dma_buf_v; | |
146 | ||
147 | pr_debug("rackmeter: %s\n", pause ? "paused" : "started"); | |
148 | ||
149 | rm->paused = pause; | |
150 | if (pause) { | |
151 | DBDMA_DO_STOP(rm->dma_regs); | |
152 | return; | |
153 | } | |
154 | memset(rdma->buf1, 0, SAMPLE_COUNT & sizeof(u32)); | |
155 | memset(rdma->buf2, 0, SAMPLE_COUNT & sizeof(u32)); | |
156 | ||
157 | rm->dma_buf_v->mark = 0; | |
158 | ||
159 | mb(); | |
160 | out_le32(&rm->dma_regs->cmdptr_hi, 0); | |
161 | out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p); | |
162 | out_le32(&rm->dma_regs->control, (RUN << 16) | RUN); | |
163 | } | |
164 | ||
165 | static void rackmeter_setup_dbdma(struct rackmeter *rm) | |
166 | { | |
167 | struct rackmeter_dma *db = rm->dma_buf_v; | |
168 | struct dbdma_cmd *cmd = db->cmd; | |
169 | ||
170 | /* Make sure dbdma is reset */ | |
171 | DBDMA_DO_RESET(rm->dma_regs); | |
172 | ||
193d0732 | 173 | pr_debug("rackmeter: mark offset=0x%zx\n", |
3e00a5ae | 174 | offsetof(struct rackmeter_dma, mark)); |
193d0732 | 175 | pr_debug("rackmeter: buf1 offset=0x%zx\n", |
3e00a5ae | 176 | offsetof(struct rackmeter_dma, buf1)); |
193d0732 | 177 | pr_debug("rackmeter: buf2 offset=0x%zx\n", |
3e00a5ae BH |
178 | offsetof(struct rackmeter_dma, buf2)); |
179 | ||
180 | /* Prepare 4 dbdma commands for the 2 buffers */ | |
181 | memset(cmd, 0, 4 * sizeof(struct dbdma_cmd)); | |
182 | st_le16(&cmd->req_count, 4); | |
183 | st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
184 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
185 | offsetof(struct rackmeter_dma, mark)); | |
186 | st_le32(&cmd->cmd_dep, 0x02000000); | |
187 | cmd++; | |
188 | ||
189 | st_le16(&cmd->req_count, SAMPLE_COUNT * 4); | |
190 | st_le16(&cmd->command, OUTPUT_MORE); | |
191 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
192 | offsetof(struct rackmeter_dma, buf1)); | |
193 | cmd++; | |
194 | ||
195 | st_le16(&cmd->req_count, 4); | |
196 | st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
197 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
198 | offsetof(struct rackmeter_dma, mark)); | |
199 | st_le32(&cmd->cmd_dep, 0x01000000); | |
200 | cmd++; | |
201 | ||
202 | st_le16(&cmd->req_count, SAMPLE_COUNT * 4); | |
203 | st_le16(&cmd->command, OUTPUT_MORE | BR_ALWAYS); | |
204 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
205 | offsetof(struct rackmeter_dma, buf2)); | |
206 | st_le32(&cmd->cmd_dep, rm->dma_buf_p); | |
207 | ||
208 | rackmeter_do_pause(rm, 0); | |
209 | } | |
210 | ||
6d5aefb8 | 211 | static void rackmeter_do_timer(struct work_struct *work) |
3e00a5ae | 212 | { |
6d5aefb8 DH |
213 | struct rackmeter_cpu *rcpu = |
214 | container_of(work, struct rackmeter_cpu, sniffer.work); | |
215 | struct rackmeter *rm = rcpu->rm; | |
3e00a5ae | 216 | unsigned int cpu = smp_processor_id(); |
3e00a5ae BH |
217 | cputime64_t cur_jiffies, total_idle_ticks; |
218 | unsigned int total_ticks, idle_ticks; | |
219 | int i, offset, load, cumm, pause; | |
220 | ||
221 | cur_jiffies = jiffies64_to_cputime64(get_jiffies_64()); | |
222 | total_ticks = (unsigned int)cputime64_sub(cur_jiffies, | |
223 | rcpu->prev_wall); | |
224 | rcpu->prev_wall = cur_jiffies; | |
225 | ||
226 | total_idle_ticks = get_cpu_idle_time(cpu); | |
227 | idle_ticks = (unsigned int) cputime64_sub(total_idle_ticks, | |
228 | rcpu->prev_idle); | |
229 | rcpu->prev_idle = total_idle_ticks; | |
230 | ||
231 | /* We do a very dumb calculation to update the LEDs for now, | |
232 | * we'll do better once we have actual PWM implemented | |
233 | */ | |
234 | load = (9 * (total_ticks - idle_ticks)) / total_ticks; | |
235 | ||
236 | offset = cpu << 3; | |
237 | cumm = 0; | |
238 | for (i = 0; i < 8; i++) { | |
239 | u8 ub = (load > i) ? 0xff : 0; | |
240 | rm->ubuf[i + offset] = ub; | |
241 | cumm |= ub; | |
242 | } | |
243 | rcpu->zero = (cumm == 0); | |
244 | ||
245 | /* Now check if LEDs are all 0, we can stop DMA */ | |
246 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
247 | if (pause != rm->paused) { | |
248 | mutex_lock(&rm->sem); | |
249 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
250 | rackmeter_do_pause(rm, pause); | |
251 | mutex_unlock(&rm->sem); | |
252 | } | |
253 | schedule_delayed_work_on(cpu, &rcpu->sniffer, | |
254 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
255 | } | |
256 | ||
257 | static void __devinit rackmeter_init_cpu_sniffer(struct rackmeter *rm) | |
258 | { | |
259 | unsigned int cpu; | |
260 | ||
261 | /* This driver works only with 1 or 2 CPUs numbered 0 and 1, | |
262 | * but that's really all we have on Apple Xserve. It doesn't | |
263 | * play very nice with CPU hotplug neither but we don't do that | |
264 | * on those machines yet | |
265 | */ | |
266 | ||
6d5aefb8 DH |
267 | rm->cpu[0].rm = rm; |
268 | INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer); | |
269 | rm->cpu[1].rm = rm; | |
270 | INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer); | |
3e00a5ae BH |
271 | |
272 | for_each_online_cpu(cpu) { | |
273 | struct rackmeter_cpu *rcpu; | |
274 | ||
275 | if (cpu > 1) | |
276 | continue; | |
277 | rcpu = &rm->cpu[cpu];; | |
278 | rcpu->prev_idle = get_cpu_idle_time(cpu); | |
279 | rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64()); | |
280 | schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer, | |
281 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
282 | } | |
283 | } | |
284 | ||
285 | static void __devexit rackmeter_stop_cpu_sniffer(struct rackmeter *rm) | |
286 | { | |
287 | cancel_rearming_delayed_work(&rm->cpu[0].sniffer); | |
288 | cancel_rearming_delayed_work(&rm->cpu[1].sniffer); | |
289 | } | |
290 | ||
291 | static int rackmeter_setup(struct rackmeter *rm) | |
292 | { | |
293 | pr_debug("rackmeter: setting up i2s..\n"); | |
294 | rackmeter_setup_i2s(rm); | |
295 | ||
296 | pr_debug("rackmeter: setting up default pattern..\n"); | |
297 | rackmeter_set_default_pattern(rm); | |
298 | ||
299 | pr_debug("rackmeter: setting up dbdma..\n"); | |
300 | rackmeter_setup_dbdma(rm); | |
301 | ||
302 | pr_debug("rackmeter: start CPU measurements..\n"); | |
303 | rackmeter_init_cpu_sniffer(rm); | |
304 | ||
305 | printk(KERN_INFO "RackMeter initialized\n"); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | /* XXX FIXME: No PWM yet, this is 0/1 */ | |
311 | static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index) | |
312 | { | |
313 | int led; | |
314 | u32 sample = 0; | |
315 | ||
316 | for (led = 0; led < 16; led++) { | |
317 | sample >>= 1; | |
318 | sample |= ((rm->ubuf[led] >= 0x80) << 15); | |
319 | } | |
320 | return (sample << 17) | (sample >> 15); | |
321 | } | |
322 | ||
323 | static irqreturn_t rackmeter_irq(int irq, void *arg) | |
324 | { | |
325 | struct rackmeter *rm = arg; | |
326 | struct rackmeter_dma *db = rm->dma_buf_v; | |
327 | unsigned int mark, i; | |
328 | u32 *buf; | |
329 | ||
330 | /* Flush PCI buffers with an MMIO read. Maybe we could actually | |
331 | * check the status one day ... in case things go wrong, though | |
332 | * this never happened to me | |
333 | */ | |
334 | (void)in_le32(&rm->dma_regs->status); | |
335 | ||
336 | /* Make sure the CPU gets us in order */ | |
337 | rmb(); | |
338 | ||
339 | /* Read mark */ | |
340 | mark = db->mark; | |
341 | if (mark != 1 && mark != 2) { | |
342 | printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n", | |
343 | mark); | |
344 | /* We allow for 3 errors like that (stale DBDMA irqs) */ | |
345 | if (++rm->stale_irq > 3) { | |
346 | printk(KERN_ERR "rackmeter: Too many errors," | |
347 | " stopping DMA\n"); | |
348 | DBDMA_DO_RESET(rm->dma_regs); | |
349 | } | |
350 | return IRQ_HANDLED; | |
351 | } | |
352 | ||
353 | /* Next buffer we need to fill is mark value */ | |
354 | buf = mark == 1 ? db->buf1 : db->buf2; | |
355 | ||
356 | /* Fill it now. This routine converts the 8 bits depth sample array | |
357 | * into the PWM bitmap for each LED. | |
358 | */ | |
359 | for (i = 0; i < SAMPLE_COUNT; i++) | |
360 | buf[i] = rackmeter_calc_sample(rm, i); | |
361 | ||
362 | ||
363 | return IRQ_HANDLED; | |
364 | } | |
365 | ||
366 | static int __devinit rackmeter_probe(struct macio_dev* mdev, | |
367 | const struct of_device_id *match) | |
368 | { | |
369 | struct device_node *i2s = NULL, *np = NULL; | |
370 | struct rackmeter *rm = NULL; | |
371 | struct resource ri2s, rdma; | |
372 | int rc = -ENODEV; | |
373 | ||
374 | pr_debug("rackmeter_probe()\n"); | |
375 | ||
376 | /* Get i2s-a node */ | |
377 | while ((i2s = of_get_next_child(mdev->ofdev.node, i2s)) != NULL) | |
378 | if (strcmp(i2s->name, "i2s-a") == 0) | |
379 | break; | |
380 | if (i2s == NULL) { | |
381 | pr_debug(" i2s-a child not found\n"); | |
382 | goto bail; | |
383 | } | |
384 | /* Get lightshow or virtual sound */ | |
385 | while ((np = of_get_next_child(i2s, np)) != NULL) { | |
386 | if (strcmp(np->name, "lightshow") == 0) | |
387 | break; | |
388 | if ((strcmp(np->name, "sound") == 0) && | |
01b2726d | 389 | of_get_property(np, "virtual", NULL) != NULL) |
3e00a5ae BH |
390 | break; |
391 | } | |
392 | if (np == NULL) { | |
393 | pr_debug(" lightshow or sound+virtual child not found\n"); | |
394 | goto bail; | |
395 | } | |
396 | ||
397 | /* Create and initialize our instance data */ | |
398 | rm = kzalloc(sizeof(struct rackmeter), GFP_KERNEL); | |
399 | if (rm == NULL) { | |
400 | printk(KERN_ERR "rackmeter: failed to allocate memory !\n"); | |
401 | rc = -ENOMEM; | |
402 | goto bail_release; | |
403 | } | |
404 | rm->mdev = mdev; | |
405 | rm->i2s = i2s; | |
406 | mutex_init(&rm->sem); | |
407 | dev_set_drvdata(&mdev->ofdev.dev, rm); | |
408 | /* Check resources availability. We need at least resource 0 and 1 */ | |
409 | #if 0 /* Use that when i2s-a is finally an mdev per-se */ | |
410 | if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) { | |
411 | printk(KERN_ERR | |
412 | "rackmeter: found match but lacks resources: %s" | |
413 | " (%d resources, %d interrupts)\n", | |
414 | mdev->ofdev.node->full_name); | |
415 | rc = -ENXIO; | |
416 | goto bail_free; | |
417 | } | |
418 | if (macio_request_resources(mdev, "rackmeter")) { | |
419 | printk(KERN_ERR | |
420 | "rackmeter: failed to request resources: %s\n", | |
421 | mdev->ofdev.node->full_name); | |
422 | rc = -EBUSY; | |
423 | goto bail_free; | |
424 | } | |
425 | rm->irq = macio_irq(mdev, 1); | |
426 | #else | |
427 | rm->irq = irq_of_parse_and_map(i2s, 1); | |
428 | if (rm->irq == NO_IRQ || | |
429 | of_address_to_resource(i2s, 0, &ri2s) || | |
430 | of_address_to_resource(i2s, 1, &rdma)) { | |
431 | printk(KERN_ERR | |
432 | "rackmeter: found match but lacks resources: %s", | |
433 | mdev->ofdev.node->full_name); | |
434 | rc = -ENXIO; | |
435 | goto bail_free; | |
436 | } | |
437 | #endif | |
438 | ||
439 | pr_debug(" i2s @0x%08x\n", (unsigned int)ri2s.start); | |
440 | pr_debug(" dma @0x%08x\n", (unsigned int)rdma.start); | |
441 | pr_debug(" irq %d\n", rm->irq); | |
442 | ||
443 | rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL); | |
444 | if (rm->ubuf == NULL) { | |
445 | printk(KERN_ERR | |
446 | "rackmeter: failed to allocate samples page !\n"); | |
447 | rc = -ENOMEM; | |
448 | goto bail_release; | |
449 | } | |
450 | ||
451 | rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev, | |
452 | sizeof(struct rackmeter_dma), | |
453 | &rm->dma_buf_p, GFP_KERNEL); | |
454 | if (rm->dma_buf_v == NULL) { | |
455 | printk(KERN_ERR | |
456 | "rackmeter: failed to allocate dma buffer !\n"); | |
457 | rc = -ENOMEM; | |
458 | goto bail_free_samples; | |
459 | } | |
460 | #if 0 | |
461 | rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000); | |
462 | #else | |
463 | rm->i2s_regs = ioremap(ri2s.start, 0x1000); | |
464 | #endif | |
465 | if (rm->i2s_regs == NULL) { | |
466 | printk(KERN_ERR | |
467 | "rackmeter: failed to map i2s registers !\n"); | |
468 | rc = -ENXIO; | |
469 | goto bail_free_dma; | |
470 | } | |
471 | #if 0 | |
472 | rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100); | |
473 | #else | |
474 | rm->dma_regs = ioremap(rdma.start, 0x100); | |
475 | #endif | |
476 | if (rm->dma_regs == NULL) { | |
477 | printk(KERN_ERR | |
478 | "rackmeter: failed to map dma registers !\n"); | |
479 | rc = -ENXIO; | |
480 | goto bail_unmap_i2s; | |
481 | } | |
482 | ||
483 | rc = rackmeter_setup(rm); | |
484 | if (rc) { | |
485 | printk(KERN_ERR | |
486 | "rackmeter: failed to initialize !\n"); | |
487 | rc = -ENXIO; | |
488 | goto bail_unmap_dma; | |
489 | } | |
490 | ||
491 | rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm); | |
492 | if (rc != 0) { | |
493 | printk(KERN_ERR | |
494 | "rackmeter: failed to request interrupt !\n"); | |
495 | goto bail_stop_dma; | |
496 | } | |
497 | of_node_put(np); | |
498 | return 0; | |
499 | ||
500 | bail_stop_dma: | |
501 | DBDMA_DO_RESET(rm->dma_regs); | |
502 | bail_unmap_dma: | |
503 | iounmap(rm->dma_regs); | |
504 | bail_unmap_i2s: | |
505 | iounmap(rm->i2s_regs); | |
506 | bail_free_dma: | |
507 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
508 | sizeof(struct rackmeter_dma), | |
509 | rm->dma_buf_v, rm->dma_buf_p); | |
510 | bail_free_samples: | |
511 | free_page((unsigned long)rm->ubuf); | |
512 | bail_release: | |
513 | #if 0 | |
514 | macio_release_resources(mdev); | |
515 | #endif | |
516 | bail_free: | |
517 | kfree(rm); | |
518 | bail: | |
519 | of_node_put(i2s); | |
520 | of_node_put(np); | |
521 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
522 | return rc; | |
523 | } | |
524 | ||
525 | static int __devexit rackmeter_remove(struct macio_dev* mdev) | |
526 | { | |
527 | struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); | |
528 | ||
529 | /* Stop CPU sniffer timer & work queues */ | |
530 | rackmeter_stop_cpu_sniffer(rm); | |
531 | ||
532 | /* Clear reference to private data */ | |
533 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
534 | ||
535 | /* Stop/reset dbdma */ | |
536 | DBDMA_DO_RESET(rm->dma_regs); | |
537 | ||
538 | /* Release the IRQ */ | |
539 | free_irq(rm->irq, rm); | |
540 | ||
541 | /* Unmap registers */ | |
542 | iounmap(rm->dma_regs); | |
543 | iounmap(rm->i2s_regs); | |
544 | ||
545 | /* Free DMA */ | |
546 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
547 | sizeof(struct rackmeter_dma), | |
548 | rm->dma_buf_v, rm->dma_buf_p); | |
549 | ||
550 | /* Free samples */ | |
551 | free_page((unsigned long)rm->ubuf); | |
552 | ||
553 | #if 0 | |
554 | /* Release resources */ | |
555 | macio_release_resources(mdev); | |
556 | #endif | |
557 | ||
558 | /* Get rid of me */ | |
559 | kfree(rm); | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static int rackmeter_shutdown(struct macio_dev* mdev) | |
565 | { | |
566 | struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); | |
567 | ||
568 | if (rm == NULL) | |
569 | return -ENODEV; | |
570 | ||
571 | /* Stop CPU sniffer timer & work queues */ | |
572 | rackmeter_stop_cpu_sniffer(rm); | |
573 | ||
574 | /* Stop/reset dbdma */ | |
575 | DBDMA_DO_RESET(rm->dma_regs); | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | static struct of_device_id rackmeter_match[] = { | |
581 | { .name = "i2s" }, | |
582 | { } | |
583 | }; | |
584 | ||
585 | static struct macio_driver rackmeter_drv = { | |
586 | .name = "rackmeter", | |
587 | .owner = THIS_MODULE, | |
588 | .match_table = rackmeter_match, | |
589 | .probe = rackmeter_probe, | |
590 | .remove = rackmeter_remove, | |
591 | .shutdown = rackmeter_shutdown, | |
592 | }; | |
593 | ||
594 | ||
595 | static int __init rackmeter_init(void) | |
596 | { | |
597 | pr_debug("rackmeter_init()\n"); | |
598 | ||
599 | return macio_register_driver(&rackmeter_drv); | |
600 | } | |
601 | ||
602 | static void __exit rackmeter_exit(void) | |
603 | { | |
604 | pr_debug("rackmeter_exit()\n"); | |
605 | ||
606 | macio_unregister_driver(&rackmeter_drv); | |
607 | } | |
608 | ||
609 | module_init(rackmeter_init); | |
610 | module_exit(rackmeter_exit); | |
611 | ||
612 | ||
613 | MODULE_LICENSE("GPL"); | |
614 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
615 | MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel"); |