1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * RackMac vu-meter driver |
4 | * |
5 | * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp. |
6 | * <benh@kernel.crashing.org> |
7 | * |
8 | * Support the CPU-meter LEDs of the Xserve G5 |
9 | * |
10 | * TODO: Implement PWM to do variable intensity and provide userland |
11 | * interface for fun. Also, the CPU-meter could be made nicer by being |
12 | * a bit less "immediate" but giving instead a more average load over |
13 | * time. Patches welcome :-) |
14 | */ |
15 | #undef DEBUG |
16 | |
17 | #include <linux/types.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/device.h> |
21 | #include <linux/interrupt.h> |
22 | #include <linux/module.h> |
23 | #include <linux/pci.h> |
24 | #include <linux/dma-mapping.h> |
25 | #include <linux/kernel_stat.h> |
26 | #include <linux/of_address.h> |
27 | #include <linux/of_irq.h> |
28 | |
29 | #include <asm/io.h> |
30 | #include <asm/machdep.h> |
31 | #include <asm/pmac_feature.h> |
32 | #include <asm/dbdma.h> |
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 { |
50 | struct delayed_work sniffer; |
51 | struct rackmeter *rm; |
52 | u64 prev_wall; |
53 | u64 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 u64 get_cpu_idle_time(unsigned int cpu) |
82 | { |
83 | struct kernel_cpustat *kcpustat = &kcpustat_cpu(cpu); |
84 | u64 retval; |
85 | |
86 | retval = kcpustat->cpustat[CPUTIME_IDLE] + |
87 | kcpustat->cpustat[CPUTIME_IOWAIT]; |
88 | |
89 | if (rackmeter_ignore_nice) |
90 | retval += kcpustat_field(kcpustat, usage: CPUTIME_NICE, cpu); |
91 | |
92 | return retval; |
93 | } |
94 | |
95 | static void rackmeter_setup_i2s(struct rackmeter *rm) |
96 | { |
97 | struct macio_chip *macio = rm->mdev->bus->chip; |
98 | |
99 | /* First whack magic GPIO */ |
100 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5); |
101 | |
102 | |
103 | /* Call feature code to enable the sound channel and the proper |
104 | * clock sources |
105 | */ |
106 | pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1); |
107 | |
108 | /* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now. |
109 | * This is a bit racy, thus we should add new platform functions to |
110 | * handle that. snd-aoa needs that too |
111 | */ |
112 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE); |
113 | MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT); |
114 | (void)MACIO_IN32(KEYLARGO_FCR1); |
115 | udelay(10); |
116 | |
117 | /* Then setup i2s. For now, we use the same magic value that |
118 | * the OS X driver seems to use. We might want to play around |
119 | * with the clock divisors later |
120 | */ |
121 | out_le32(rm->i2s_regs + 0x10, 0x01fa0000); |
122 | (void)in_le32(rm->i2s_regs + 0x10); |
123 | udelay(10); |
124 | |
125 | /* Fully restart i2s*/ |
126 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE | |
127 | KL1_I2S0_CLK_ENABLE_BIT); |
128 | (void)MACIO_IN32(KEYLARGO_FCR1); |
129 | udelay(10); |
130 | } |
131 | |
132 | static void rackmeter_set_default_pattern(struct rackmeter *rm) |
133 | { |
134 | int i; |
135 | |
136 | for (i = 0; i < 16; i++) { |
137 | if (i < 8) |
138 | rm->ubuf[i] = (i & 1) * 255; |
139 | else |
140 | rm->ubuf[i] = ((~i) & 1) * 255; |
141 | } |
142 | } |
143 | |
144 | static void rackmeter_do_pause(struct rackmeter *rm, int pause) |
145 | { |
146 | struct rackmeter_dma *rdma = rm->dma_buf_v; |
147 | |
148 | pr_debug("rackmeter: %s\n" , pause ? "paused" : "started" ); |
149 | |
150 | rm->paused = pause; |
151 | if (pause) { |
152 | DBDMA_DO_STOP(rm->dma_regs); |
153 | return; |
154 | } |
155 | memset(rdma->buf1, 0, sizeof(rdma->buf1)); |
156 | memset(rdma->buf2, 0, sizeof(rdma->buf2)); |
157 | |
158 | rm->dma_buf_v->mark = 0; |
159 | |
160 | mb(); |
161 | out_le32(&rm->dma_regs->cmdptr_hi, 0); |
162 | out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p); |
163 | out_le32(&rm->dma_regs->control, (RUN << 16) | RUN); |
164 | } |
165 | |
166 | static void rackmeter_setup_dbdma(struct rackmeter *rm) |
167 | { |
168 | struct rackmeter_dma *db = rm->dma_buf_v; |
169 | struct dbdma_cmd *cmd = db->cmd; |
170 | |
171 | /* Make sure dbdma is reset */ |
172 | DBDMA_DO_RESET(rm->dma_regs); |
173 | |
174 | pr_debug("rackmeter: mark offset=0x%zx\n" , |
175 | offsetof(struct rackmeter_dma, mark)); |
176 | pr_debug("rackmeter: buf1 offset=0x%zx\n" , |
177 | offsetof(struct rackmeter_dma, buf1)); |
178 | pr_debug("rackmeter: buf2 offset=0x%zx\n" , |
179 | offsetof(struct rackmeter_dma, buf2)); |
180 | |
181 | /* Prepare 4 dbdma commands for the 2 buffers */ |
182 | memset(cmd, 0, 4 * sizeof(struct dbdma_cmd)); |
183 | cmd->req_count = cpu_to_le16(4); |
184 | cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); |
185 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
186 | offsetof(struct rackmeter_dma, mark)); |
187 | cmd->cmd_dep = cpu_to_le32(0x02000000); |
188 | cmd++; |
189 | |
190 | cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4); |
191 | cmd->command = cpu_to_le16(OUTPUT_MORE); |
192 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
193 | offsetof(struct rackmeter_dma, buf1)); |
194 | cmd++; |
195 | |
196 | cmd->req_count = cpu_to_le16(4); |
197 | cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); |
198 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
199 | offsetof(struct rackmeter_dma, mark)); |
200 | cmd->cmd_dep = cpu_to_le32(0x01000000); |
201 | cmd++; |
202 | |
203 | cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4); |
204 | cmd->command = cpu_to_le16(OUTPUT_MORE | BR_ALWAYS); |
205 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + |
206 | offsetof(struct rackmeter_dma, buf2)); |
207 | cmd->cmd_dep = cpu_to_le32(rm->dma_buf_p); |
208 | |
209 | rackmeter_do_pause(rm, pause: 0); |
210 | } |
211 | |
212 | static void rackmeter_do_timer(struct work_struct *work) |
213 | { |
214 | struct rackmeter_cpu *rcpu = |
215 | container_of(work, struct rackmeter_cpu, sniffer.work); |
216 | struct rackmeter *rm = rcpu->rm; |
217 | unsigned int cpu = smp_processor_id(); |
218 | u64 cur_nsecs, total_idle_nsecs; |
219 | u64 total_nsecs, idle_nsecs; |
220 | int i, offset, load, cumm, pause; |
221 | |
222 | cur_nsecs = jiffies64_to_nsecs(j: get_jiffies_64()); |
223 | total_nsecs = cur_nsecs - rcpu->prev_wall; |
224 | rcpu->prev_wall = cur_nsecs; |
225 | |
226 | total_idle_nsecs = get_cpu_idle_time(cpu); |
227 | idle_nsecs = total_idle_nsecs - rcpu->prev_idle; |
228 | idle_nsecs = min(idle_nsecs, total_nsecs); |
229 | rcpu->prev_idle = total_idle_nsecs; |
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 = div64_u64(dividend: 9 * (total_nsecs - idle_nsecs), divisor: total_nsecs); |
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(lock: &rm->sem); |
252 | } |
253 | schedule_delayed_work_on(cpu, dwork: &rcpu->sniffer, |
254 | delay: msecs_to_jiffies(CPU_SAMPLING_RATE)); |
255 | } |
256 | |
257 | static void 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 | |
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); |
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_nsecs(j: get_jiffies_64()); |
280 | schedule_delayed_work_on(cpu, dwork: &rm->cpu[cpu].sniffer, |
281 | delay: msecs_to_jiffies(CPU_SAMPLING_RATE)); |
282 | } |
283 | } |
284 | |
285 | static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm) |
286 | { |
287 | cancel_delayed_work_sync(dwork: &rm->cpu[0].sniffer); |
288 | cancel_delayed_work_sync(dwork: &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, index: i); |
361 | |
362 | |
363 | return IRQ_HANDLED; |
364 | } |
365 | |
366 | static int 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 | for_each_child_of_node(mdev->ofdev.dev.of_node, i2s) |
378 | if (of_node_name_eq(np: i2s, name: "i2s-a" )) |
379 | break; |
380 | |
381 | if (i2s == NULL) { |
382 | pr_debug(" i2s-a child not found\n" ); |
383 | goto bail; |
384 | } |
385 | /* Get lightshow or virtual sound */ |
386 | for_each_child_of_node(i2s, np) { |
387 | if (of_node_name_eq(np, name: "lightshow" )) |
388 | break; |
389 | if (of_node_name_eq(np, name: "sound" ) && |
390 | of_property_present(np, propname: "virtual" )) |
391 | break; |
392 | } |
393 | if (np == NULL) { |
394 | pr_debug(" lightshow or sound+virtual child not found\n" ); |
395 | goto bail; |
396 | } |
397 | |
398 | /* Create and initialize our instance data */ |
399 | rm = kzalloc(size: sizeof(*rm), GFP_KERNEL); |
400 | if (rm == NULL) { |
401 | printk(KERN_ERR "rackmeter: failed to allocate memory !\n" ); |
402 | rc = -ENOMEM; |
403 | goto bail_release; |
404 | } |
405 | rm->mdev = mdev; |
406 | rm->i2s = i2s; |
407 | mutex_init(&rm->sem); |
408 | dev_set_drvdata(dev: &mdev->ofdev.dev, data: rm); |
409 | /* Check resources availability. We need at least resource 0 and 1 */ |
410 | #if 0 /* Use that when i2s-a is finally an mdev per-se */ |
411 | if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) { |
412 | printk(KERN_ERR |
413 | "rackmeter: found match but lacks resources: %pOF" |
414 | " (%d resources, %d interrupts)\n" , |
415 | mdev->ofdev.dev.of_node); |
416 | rc = -ENXIO; |
417 | goto bail_free; |
418 | } |
419 | if (macio_request_resources(mdev, "rackmeter" )) { |
420 | printk(KERN_ERR |
421 | "rackmeter: failed to request resources: %pOF\n" , |
422 | mdev->ofdev.dev.of_node); |
423 | rc = -EBUSY; |
424 | goto bail_free; |
425 | } |
426 | rm->irq = macio_irq(mdev, 1); |
427 | #else |
428 | rm->irq = irq_of_parse_and_map(node: i2s, index: 1); |
429 | if (!rm->irq || |
430 | of_address_to_resource(dev: i2s, index: 0, r: &ri2s) || |
431 | of_address_to_resource(dev: i2s, index: 1, r: &rdma)) { |
432 | printk(KERN_ERR |
433 | "rackmeter: found match but lacks resources: %pOF" , |
434 | mdev->ofdev.dev.of_node); |
435 | rc = -ENXIO; |
436 | goto bail_free; |
437 | } |
438 | #endif |
439 | |
440 | pr_debug(" i2s @0x%08x\n" , (unsigned int)ri2s.start); |
441 | pr_debug(" dma @0x%08x\n" , (unsigned int)rdma.start); |
442 | pr_debug(" irq %d\n" , rm->irq); |
443 | |
444 | rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL); |
445 | if (rm->ubuf == NULL) { |
446 | printk(KERN_ERR |
447 | "rackmeter: failed to allocate samples page !\n" ); |
448 | rc = -ENOMEM; |
449 | goto bail_release; |
450 | } |
451 | |
452 | rm->dma_buf_v = dma_alloc_coherent(dev: &macio_get_pci_dev(mdev)->dev, |
453 | size: sizeof(struct rackmeter_dma), |
454 | dma_handle: &rm->dma_buf_p, GFP_KERNEL); |
455 | if (rm->dma_buf_v == NULL) { |
456 | printk(KERN_ERR |
457 | "rackmeter: failed to allocate dma buffer !\n" ); |
458 | rc = -ENOMEM; |
459 | goto bail_free_samples; |
460 | } |
461 | #if 0 |
462 | rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000); |
463 | #else |
464 | rm->i2s_regs = ioremap(offset: ri2s.start, size: 0x1000); |
465 | #endif |
466 | if (rm->i2s_regs == NULL) { |
467 | printk(KERN_ERR |
468 | "rackmeter: failed to map i2s registers !\n" ); |
469 | rc = -ENXIO; |
470 | goto bail_free_dma; |
471 | } |
472 | #if 0 |
473 | rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100); |
474 | #else |
475 | rm->dma_regs = ioremap(offset: rdma.start, size: 0x100); |
476 | #endif |
477 | if (rm->dma_regs == NULL) { |
478 | printk(KERN_ERR |
479 | "rackmeter: failed to map dma registers !\n" ); |
480 | rc = -ENXIO; |
481 | goto bail_unmap_i2s; |
482 | } |
483 | |
484 | rc = rackmeter_setup(rm); |
485 | if (rc) { |
486 | printk(KERN_ERR |
487 | "rackmeter: failed to initialize !\n" ); |
488 | rc = -ENXIO; |
489 | goto bail_unmap_dma; |
490 | } |
491 | |
492 | rc = request_irq(irq: rm->irq, handler: rackmeter_irq, flags: 0, name: "rackmeter" , dev: rm); |
493 | if (rc != 0) { |
494 | printk(KERN_ERR |
495 | "rackmeter: failed to request interrupt !\n" ); |
496 | goto bail_stop_dma; |
497 | } |
498 | of_node_put(node: np); |
499 | return 0; |
500 | |
501 | bail_stop_dma: |
502 | DBDMA_DO_RESET(rm->dma_regs); |
503 | bail_unmap_dma: |
504 | iounmap(addr: rm->dma_regs); |
505 | bail_unmap_i2s: |
506 | iounmap(addr: rm->i2s_regs); |
507 | bail_free_dma: |
508 | dma_free_coherent(dev: &macio_get_pci_dev(mdev)->dev, |
509 | size: sizeof(struct rackmeter_dma), |
510 | cpu_addr: rm->dma_buf_v, dma_handle: rm->dma_buf_p); |
511 | bail_free_samples: |
512 | free_page((unsigned long)rm->ubuf); |
513 | bail_release: |
514 | #if 0 |
515 | macio_release_resources(mdev); |
516 | #endif |
517 | bail_free: |
518 | kfree(objp: rm); |
519 | bail: |
520 | of_node_put(node: i2s); |
521 | of_node_put(node: np); |
522 | dev_set_drvdata(dev: &mdev->ofdev.dev, NULL); |
523 | return rc; |
524 | } |
525 | |
526 | static int rackmeter_remove(struct macio_dev* mdev) |
527 | { |
528 | struct rackmeter *rm = dev_get_drvdata(dev: &mdev->ofdev.dev); |
529 | |
530 | /* Stop CPU sniffer timer & work queues */ |
531 | rackmeter_stop_cpu_sniffer(rm); |
532 | |
533 | /* Clear reference to private data */ |
534 | dev_set_drvdata(dev: &mdev->ofdev.dev, NULL); |
535 | |
536 | /* Stop/reset dbdma */ |
537 | DBDMA_DO_RESET(rm->dma_regs); |
538 | |
539 | /* Release the IRQ */ |
540 | free_irq(rm->irq, rm); |
541 | |
542 | /* Unmap registers */ |
543 | iounmap(addr: rm->dma_regs); |
544 | iounmap(addr: rm->i2s_regs); |
545 | |
546 | /* Free DMA */ |
547 | dma_free_coherent(dev: &macio_get_pci_dev(mdev)->dev, |
548 | size: sizeof(struct rackmeter_dma), |
549 | cpu_addr: rm->dma_buf_v, dma_handle: rm->dma_buf_p); |
550 | |
551 | /* Free samples */ |
552 | free_page((unsigned long)rm->ubuf); |
553 | |
554 | #if 0 |
555 | /* Release resources */ |
556 | macio_release_resources(mdev); |
557 | #endif |
558 | |
559 | /* Get rid of me */ |
560 | kfree(objp: rm); |
561 | |
562 | return 0; |
563 | } |
564 | |
565 | static int rackmeter_shutdown(struct macio_dev* mdev) |
566 | { |
567 | struct rackmeter *rm = dev_get_drvdata(dev: &mdev->ofdev.dev); |
568 | |
569 | if (rm == NULL) |
570 | return -ENODEV; |
571 | |
572 | /* Stop CPU sniffer timer & work queues */ |
573 | rackmeter_stop_cpu_sniffer(rm); |
574 | |
575 | /* Stop/reset dbdma */ |
576 | DBDMA_DO_RESET(rm->dma_regs); |
577 | |
578 | return 0; |
579 | } |
580 | |
581 | static const struct of_device_id rackmeter_match[] = { |
582 | { .name = "i2s" }, |
583 | { } |
584 | }; |
585 | MODULE_DEVICE_TABLE(of, rackmeter_match); |
586 | |
587 | static struct macio_driver rackmeter_driver = { |
588 | .driver = { |
589 | .name = "rackmeter" , |
590 | .owner = THIS_MODULE, |
591 | .of_match_table = rackmeter_match, |
592 | }, |
593 | .probe = rackmeter_probe, |
594 | .remove = rackmeter_remove, |
595 | .shutdown = rackmeter_shutdown, |
596 | }; |
597 | |
598 | |
599 | static int __init rackmeter_init(void) |
600 | { |
601 | pr_debug("rackmeter_init()\n" ); |
602 | |
603 | return macio_register_driver(&rackmeter_driver); |
604 | } |
605 | |
606 | static void __exit rackmeter_exit(void) |
607 | { |
608 | pr_debug("rackmeter_exit()\n" ); |
609 | |
610 | macio_unregister_driver(&rackmeter_driver); |
611 | } |
612 | |
613 | module_init(rackmeter_init); |
614 | module_exit(rackmeter_exit); |
615 | |
616 | |
617 | MODULE_LICENSE("GPL" ); |
618 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>" ); |
619 | MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel" ); |
620 | |