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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> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
3e00a5ae BH |
22 | #include <linux/device.h> |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/pci.h> | |
26 | #include <linux/dma-mapping.h> | |
27 | #include <linux/kernel_stat.h> | |
28 | ||
29 | #include <asm/io.h> | |
30 | #include <asm/prom.h> | |
31 | #include <asm/machdep.h> | |
32 | #include <asm/pmac_feature.h> | |
33 | #include <asm/dbdma.h> | |
3e00a5ae BH |
34 | #include <asm/macio.h> |
35 | #include <asm/keylargo.h> | |
36 | ||
37 | /* Number of samples in a sample buffer */ | |
38 | #define SAMPLE_COUNT 256 | |
39 | ||
40 | /* CPU meter sampling rate in ms */ | |
41 | #define CPU_SAMPLING_RATE 250 | |
42 | ||
43 | struct rackmeter_dma { | |
44 | struct dbdma_cmd cmd[4] ____cacheline_aligned; | |
45 | u32 mark ____cacheline_aligned; | |
46 | u32 buf1[SAMPLE_COUNT] ____cacheline_aligned; | |
47 | u32 buf2[SAMPLE_COUNT] ____cacheline_aligned; | |
48 | } ____cacheline_aligned; | |
49 | ||
50 | struct rackmeter_cpu { | |
6d5aefb8 DH |
51 | struct delayed_work sniffer; |
52 | struct rackmeter *rm; | |
3e00a5ae BH |
53 | cputime64_t prev_wall; |
54 | cputime64_t prev_idle; | |
55 | int zero; | |
56 | } ____cacheline_aligned; | |
57 | ||
58 | struct rackmeter { | |
59 | struct macio_dev *mdev; | |
60 | unsigned int irq; | |
61 | struct device_node *i2s; | |
62 | u8 *ubuf; | |
63 | struct dbdma_regs __iomem *dma_regs; | |
64 | void __iomem *i2s_regs; | |
65 | dma_addr_t dma_buf_p; | |
66 | struct rackmeter_dma *dma_buf_v; | |
67 | int stale_irq; | |
68 | struct rackmeter_cpu cpu[2]; | |
69 | int paused; | |
70 | struct mutex sem; | |
71 | }; | |
72 | ||
73 | /* To be set as a tunable */ | |
74 | static int rackmeter_ignore_nice; | |
75 | ||
76 | /* This GPIO is whacked by the OS X driver when initializing */ | |
77 | #define RACKMETER_MAGIC_GPIO 0x78 | |
78 | ||
79 | /* This is copied from cpufreq_ondemand, maybe we should put it in | |
80 | * a common header somewhere | |
81 | */ | |
82 | static inline cputime64_t get_cpu_idle_time(unsigned int cpu) | |
83 | { | |
84 | cputime64_t retval; | |
85 | ||
64861634 | 86 | retval = kstat_cpu(cpu).cpustat.idle + kstat_cpu(cpu).cpustat.iowait; |
3e00a5ae BH |
87 | |
88 | if (rackmeter_ignore_nice) | |
64861634 | 89 | retval += kstat_cpu(cpu).cpustat.nice; |
3e00a5ae BH |
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()); | |
64861634 | 222 | total_ticks = (unsigned int) (cur_jiffies - rcpu->prev_wall); |
3e00a5ae BH |
223 | rcpu->prev_wall = cur_jiffies; |
224 | ||
225 | total_idle_ticks = get_cpu_idle_time(cpu); | |
64861634 | 226 | idle_ticks = (unsigned int) (total_idle_ticks - rcpu->prev_idle); |
3e00a5ae BH |
227 | rcpu->prev_idle = total_idle_ticks; |
228 | ||
229 | /* We do a very dumb calculation to update the LEDs for now, | |
230 | * we'll do better once we have actual PWM implemented | |
231 | */ | |
232 | load = (9 * (total_ticks - idle_ticks)) / total_ticks; | |
233 | ||
234 | offset = cpu << 3; | |
235 | cumm = 0; | |
236 | for (i = 0; i < 8; i++) { | |
237 | u8 ub = (load > i) ? 0xff : 0; | |
238 | rm->ubuf[i + offset] = ub; | |
239 | cumm |= ub; | |
240 | } | |
241 | rcpu->zero = (cumm == 0); | |
242 | ||
243 | /* Now check if LEDs are all 0, we can stop DMA */ | |
244 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
245 | if (pause != rm->paused) { | |
246 | mutex_lock(&rm->sem); | |
247 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
248 | rackmeter_do_pause(rm, pause); | |
249 | mutex_unlock(&rm->sem); | |
250 | } | |
251 | schedule_delayed_work_on(cpu, &rcpu->sniffer, | |
252 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
253 | } | |
254 | ||
255 | static void __devinit rackmeter_init_cpu_sniffer(struct rackmeter *rm) | |
256 | { | |
257 | unsigned int cpu; | |
258 | ||
259 | /* This driver works only with 1 or 2 CPUs numbered 0 and 1, | |
260 | * but that's really all we have on Apple Xserve. It doesn't | |
261 | * play very nice with CPU hotplug neither but we don't do that | |
262 | * on those machines yet | |
263 | */ | |
264 | ||
6d5aefb8 DH |
265 | rm->cpu[0].rm = rm; |
266 | INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer); | |
267 | rm->cpu[1].rm = rm; | |
268 | INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer); | |
3e00a5ae BH |
269 | |
270 | for_each_online_cpu(cpu) { | |
271 | struct rackmeter_cpu *rcpu; | |
272 | ||
273 | if (cpu > 1) | |
274 | continue; | |
a419aef8 | 275 | rcpu = &rm->cpu[cpu]; |
3e00a5ae BH |
276 | rcpu->prev_idle = get_cpu_idle_time(cpu); |
277 | rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64()); | |
278 | schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer, | |
279 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
280 | } | |
281 | } | |
282 | ||
e1f4dea4 | 283 | static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm) |
3e00a5ae | 284 | { |
afe2c511 TH |
285 | cancel_delayed_work_sync(&rm->cpu[0].sniffer); |
286 | cancel_delayed_work_sync(&rm->cpu[1].sniffer); | |
3e00a5ae BH |
287 | } |
288 | ||
31421a6f | 289 | static int __devinit rackmeter_setup(struct rackmeter *rm) |
3e00a5ae BH |
290 | { |
291 | pr_debug("rackmeter: setting up i2s..\n"); | |
292 | rackmeter_setup_i2s(rm); | |
293 | ||
294 | pr_debug("rackmeter: setting up default pattern..\n"); | |
295 | rackmeter_set_default_pattern(rm); | |
296 | ||
297 | pr_debug("rackmeter: setting up dbdma..\n"); | |
298 | rackmeter_setup_dbdma(rm); | |
299 | ||
300 | pr_debug("rackmeter: start CPU measurements..\n"); | |
301 | rackmeter_init_cpu_sniffer(rm); | |
302 | ||
303 | printk(KERN_INFO "RackMeter initialized\n"); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /* XXX FIXME: No PWM yet, this is 0/1 */ | |
309 | static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index) | |
310 | { | |
311 | int led; | |
312 | u32 sample = 0; | |
313 | ||
314 | for (led = 0; led < 16; led++) { | |
315 | sample >>= 1; | |
316 | sample |= ((rm->ubuf[led] >= 0x80) << 15); | |
317 | } | |
318 | return (sample << 17) | (sample >> 15); | |
319 | } | |
320 | ||
321 | static irqreturn_t rackmeter_irq(int irq, void *arg) | |
322 | { | |
323 | struct rackmeter *rm = arg; | |
324 | struct rackmeter_dma *db = rm->dma_buf_v; | |
325 | unsigned int mark, i; | |
326 | u32 *buf; | |
327 | ||
328 | /* Flush PCI buffers with an MMIO read. Maybe we could actually | |
329 | * check the status one day ... in case things go wrong, though | |
330 | * this never happened to me | |
331 | */ | |
332 | (void)in_le32(&rm->dma_regs->status); | |
333 | ||
334 | /* Make sure the CPU gets us in order */ | |
335 | rmb(); | |
336 | ||
337 | /* Read mark */ | |
338 | mark = db->mark; | |
339 | if (mark != 1 && mark != 2) { | |
340 | printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n", | |
341 | mark); | |
342 | /* We allow for 3 errors like that (stale DBDMA irqs) */ | |
343 | if (++rm->stale_irq > 3) { | |
344 | printk(KERN_ERR "rackmeter: Too many errors," | |
345 | " stopping DMA\n"); | |
346 | DBDMA_DO_RESET(rm->dma_regs); | |
347 | } | |
348 | return IRQ_HANDLED; | |
349 | } | |
350 | ||
351 | /* Next buffer we need to fill is mark value */ | |
352 | buf = mark == 1 ? db->buf1 : db->buf2; | |
353 | ||
354 | /* Fill it now. This routine converts the 8 bits depth sample array | |
355 | * into the PWM bitmap for each LED. | |
356 | */ | |
357 | for (i = 0; i < SAMPLE_COUNT; i++) | |
358 | buf[i] = rackmeter_calc_sample(rm, i); | |
359 | ||
360 | ||
361 | return IRQ_HANDLED; | |
362 | } | |
363 | ||
364 | static int __devinit rackmeter_probe(struct macio_dev* mdev, | |
365 | const struct of_device_id *match) | |
366 | { | |
367 | struct device_node *i2s = NULL, *np = NULL; | |
368 | struct rackmeter *rm = NULL; | |
369 | struct resource ri2s, rdma; | |
370 | int rc = -ENODEV; | |
371 | ||
372 | pr_debug("rackmeter_probe()\n"); | |
373 | ||
374 | /* Get i2s-a node */ | |
61c7a080 | 375 | while ((i2s = of_get_next_child(mdev->ofdev.dev.of_node, i2s)) != NULL) |
3e00a5ae BH |
376 | if (strcmp(i2s->name, "i2s-a") == 0) |
377 | break; | |
378 | if (i2s == NULL) { | |
379 | pr_debug(" i2s-a child not found\n"); | |
380 | goto bail; | |
381 | } | |
382 | /* Get lightshow or virtual sound */ | |
383 | while ((np = of_get_next_child(i2s, np)) != NULL) { | |
384 | if (strcmp(np->name, "lightshow") == 0) | |
385 | break; | |
386 | if ((strcmp(np->name, "sound") == 0) && | |
01b2726d | 387 | of_get_property(np, "virtual", NULL) != NULL) |
3e00a5ae BH |
388 | break; |
389 | } | |
390 | if (np == NULL) { | |
391 | pr_debug(" lightshow or sound+virtual child not found\n"); | |
392 | goto bail; | |
393 | } | |
394 | ||
395 | /* Create and initialize our instance data */ | |
396 | rm = kzalloc(sizeof(struct rackmeter), GFP_KERNEL); | |
397 | if (rm == NULL) { | |
398 | printk(KERN_ERR "rackmeter: failed to allocate memory !\n"); | |
399 | rc = -ENOMEM; | |
400 | goto bail_release; | |
401 | } | |
402 | rm->mdev = mdev; | |
403 | rm->i2s = i2s; | |
404 | mutex_init(&rm->sem); | |
405 | dev_set_drvdata(&mdev->ofdev.dev, rm); | |
406 | /* Check resources availability. We need at least resource 0 and 1 */ | |
407 | #if 0 /* Use that when i2s-a is finally an mdev per-se */ | |
408 | if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) { | |
409 | printk(KERN_ERR | |
410 | "rackmeter: found match but lacks resources: %s" | |
411 | " (%d resources, %d interrupts)\n", | |
412 | mdev->ofdev.node->full_name); | |
413 | rc = -ENXIO; | |
414 | goto bail_free; | |
415 | } | |
416 | if (macio_request_resources(mdev, "rackmeter")) { | |
417 | printk(KERN_ERR | |
418 | "rackmeter: failed to request resources: %s\n", | |
419 | mdev->ofdev.node->full_name); | |
420 | rc = -EBUSY; | |
421 | goto bail_free; | |
422 | } | |
423 | rm->irq = macio_irq(mdev, 1); | |
424 | #else | |
425 | rm->irq = irq_of_parse_and_map(i2s, 1); | |
426 | if (rm->irq == NO_IRQ || | |
427 | of_address_to_resource(i2s, 0, &ri2s) || | |
428 | of_address_to_resource(i2s, 1, &rdma)) { | |
429 | printk(KERN_ERR | |
430 | "rackmeter: found match but lacks resources: %s", | |
61c7a080 | 431 | mdev->ofdev.dev.of_node->full_name); |
3e00a5ae BH |
432 | rc = -ENXIO; |
433 | goto bail_free; | |
434 | } | |
435 | #endif | |
436 | ||
437 | pr_debug(" i2s @0x%08x\n", (unsigned int)ri2s.start); | |
438 | pr_debug(" dma @0x%08x\n", (unsigned int)rdma.start); | |
439 | pr_debug(" irq %d\n", rm->irq); | |
440 | ||
441 | rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL); | |
442 | if (rm->ubuf == NULL) { | |
443 | printk(KERN_ERR | |
444 | "rackmeter: failed to allocate samples page !\n"); | |
445 | rc = -ENOMEM; | |
446 | goto bail_release; | |
447 | } | |
448 | ||
449 | rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev, | |
450 | sizeof(struct rackmeter_dma), | |
451 | &rm->dma_buf_p, GFP_KERNEL); | |
452 | if (rm->dma_buf_v == NULL) { | |
453 | printk(KERN_ERR | |
454 | "rackmeter: failed to allocate dma buffer !\n"); | |
455 | rc = -ENOMEM; | |
456 | goto bail_free_samples; | |
457 | } | |
458 | #if 0 | |
459 | rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000); | |
460 | #else | |
461 | rm->i2s_regs = ioremap(ri2s.start, 0x1000); | |
462 | #endif | |
463 | if (rm->i2s_regs == NULL) { | |
464 | printk(KERN_ERR | |
465 | "rackmeter: failed to map i2s registers !\n"); | |
466 | rc = -ENXIO; | |
467 | goto bail_free_dma; | |
468 | } | |
469 | #if 0 | |
470 | rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100); | |
471 | #else | |
472 | rm->dma_regs = ioremap(rdma.start, 0x100); | |
473 | #endif | |
474 | if (rm->dma_regs == NULL) { | |
475 | printk(KERN_ERR | |
476 | "rackmeter: failed to map dma registers !\n"); | |
477 | rc = -ENXIO; | |
478 | goto bail_unmap_i2s; | |
479 | } | |
480 | ||
481 | rc = rackmeter_setup(rm); | |
482 | if (rc) { | |
483 | printk(KERN_ERR | |
484 | "rackmeter: failed to initialize !\n"); | |
485 | rc = -ENXIO; | |
486 | goto bail_unmap_dma; | |
487 | } | |
488 | ||
489 | rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm); | |
490 | if (rc != 0) { | |
491 | printk(KERN_ERR | |
492 | "rackmeter: failed to request interrupt !\n"); | |
493 | goto bail_stop_dma; | |
494 | } | |
495 | of_node_put(np); | |
496 | return 0; | |
497 | ||
498 | bail_stop_dma: | |
499 | DBDMA_DO_RESET(rm->dma_regs); | |
500 | bail_unmap_dma: | |
501 | iounmap(rm->dma_regs); | |
502 | bail_unmap_i2s: | |
503 | iounmap(rm->i2s_regs); | |
504 | bail_free_dma: | |
505 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
506 | sizeof(struct rackmeter_dma), | |
507 | rm->dma_buf_v, rm->dma_buf_p); | |
508 | bail_free_samples: | |
509 | free_page((unsigned long)rm->ubuf); | |
510 | bail_release: | |
511 | #if 0 | |
512 | macio_release_resources(mdev); | |
513 | #endif | |
514 | bail_free: | |
515 | kfree(rm); | |
516 | bail: | |
517 | of_node_put(i2s); | |
518 | of_node_put(np); | |
519 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
520 | return rc; | |
521 | } | |
522 | ||
523 | static int __devexit rackmeter_remove(struct macio_dev* mdev) | |
524 | { | |
525 | struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); | |
526 | ||
527 | /* Stop CPU sniffer timer & work queues */ | |
528 | rackmeter_stop_cpu_sniffer(rm); | |
529 | ||
530 | /* Clear reference to private data */ | |
531 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
532 | ||
533 | /* Stop/reset dbdma */ | |
534 | DBDMA_DO_RESET(rm->dma_regs); | |
535 | ||
536 | /* Release the IRQ */ | |
537 | free_irq(rm->irq, rm); | |
538 | ||
539 | /* Unmap registers */ | |
540 | iounmap(rm->dma_regs); | |
541 | iounmap(rm->i2s_regs); | |
542 | ||
543 | /* Free DMA */ | |
544 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
545 | sizeof(struct rackmeter_dma), | |
546 | rm->dma_buf_v, rm->dma_buf_p); | |
547 | ||
548 | /* Free samples */ | |
549 | free_page((unsigned long)rm->ubuf); | |
550 | ||
551 | #if 0 | |
552 | /* Release resources */ | |
553 | macio_release_resources(mdev); | |
554 | #endif | |
555 | ||
556 | /* Get rid of me */ | |
557 | kfree(rm); | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
562 | static int rackmeter_shutdown(struct macio_dev* mdev) | |
563 | { | |
564 | struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); | |
565 | ||
566 | if (rm == NULL) | |
567 | return -ENODEV; | |
568 | ||
569 | /* Stop CPU sniffer timer & work queues */ | |
570 | rackmeter_stop_cpu_sniffer(rm); | |
571 | ||
572 | /* Stop/reset dbdma */ | |
573 | DBDMA_DO_RESET(rm->dma_regs); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static struct of_device_id rackmeter_match[] = { | |
579 | { .name = "i2s" }, | |
580 | { } | |
581 | }; | |
582 | ||
31421a6f | 583 | static struct macio_driver rackmeter_driver = { |
c2cdf6ab BH |
584 | .driver = { |
585 | .name = "rackmeter", | |
586 | .owner = THIS_MODULE, | |
587 | .of_match_table = rackmeter_match, | |
588 | }, | |
3e00a5ae | 589 | .probe = rackmeter_probe, |
31421a6f | 590 | .remove = __devexit_p(rackmeter_remove), |
3e00a5ae BH |
591 | .shutdown = rackmeter_shutdown, |
592 | }; | |
593 | ||
594 | ||
595 | static int __init rackmeter_init(void) | |
596 | { | |
597 | pr_debug("rackmeter_init()\n"); | |
598 | ||
31421a6f | 599 | return macio_register_driver(&rackmeter_driver); |
3e00a5ae BH |
600 | } |
601 | ||
602 | static void __exit rackmeter_exit(void) | |
603 | { | |
604 | pr_debug("rackmeter_exit()\n"); | |
605 | ||
31421a6f | 606 | macio_unregister_driver(&rackmeter_driver); |
3e00a5ae BH |
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"); |