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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> | |
5af50730 RH |
28 | #include <linux/of_address.h> |
29 | #include <linux/of_irq.h> | |
3e00a5ae BH |
30 | |
31 | #include <asm/io.h> | |
32 | #include <asm/prom.h> | |
33 | #include <asm/machdep.h> | |
34 | #include <asm/pmac_feature.h> | |
35 | #include <asm/dbdma.h> | |
3e00a5ae BH |
36 | #include <asm/macio.h> |
37 | #include <asm/keylargo.h> | |
38 | ||
39 | /* Number of samples in a sample buffer */ | |
40 | #define SAMPLE_COUNT 256 | |
41 | ||
42 | /* CPU meter sampling rate in ms */ | |
43 | #define CPU_SAMPLING_RATE 250 | |
44 | ||
45 | struct rackmeter_dma { | |
46 | struct dbdma_cmd cmd[4] ____cacheline_aligned; | |
47 | u32 mark ____cacheline_aligned; | |
48 | u32 buf1[SAMPLE_COUNT] ____cacheline_aligned; | |
49 | u32 buf2[SAMPLE_COUNT] ____cacheline_aligned; | |
50 | } ____cacheline_aligned; | |
51 | ||
52 | struct rackmeter_cpu { | |
6d5aefb8 DH |
53 | struct delayed_work sniffer; |
54 | struct rackmeter *rm; | |
3e00a5ae BH |
55 | cputime64_t prev_wall; |
56 | cputime64_t prev_idle; | |
57 | int zero; | |
58 | } ____cacheline_aligned; | |
59 | ||
60 | struct rackmeter { | |
61 | struct macio_dev *mdev; | |
62 | unsigned int irq; | |
63 | struct device_node *i2s; | |
64 | u8 *ubuf; | |
65 | struct dbdma_regs __iomem *dma_regs; | |
66 | void __iomem *i2s_regs; | |
67 | dma_addr_t dma_buf_p; | |
68 | struct rackmeter_dma *dma_buf_v; | |
69 | int stale_irq; | |
70 | struct rackmeter_cpu cpu[2]; | |
71 | int paused; | |
72 | struct mutex sem; | |
73 | }; | |
74 | ||
75 | /* To be set as a tunable */ | |
76 | static int rackmeter_ignore_nice; | |
77 | ||
78 | /* This GPIO is whacked by the OS X driver when initializing */ | |
79 | #define RACKMETER_MAGIC_GPIO 0x78 | |
80 | ||
81 | /* This is copied from cpufreq_ondemand, maybe we should put it in | |
82 | * a common header somewhere | |
83 | */ | |
84 | static inline cputime64_t get_cpu_idle_time(unsigned int cpu) | |
85 | { | |
3292beb3 | 86 | u64 retval; |
3e00a5ae | 87 | |
3292beb3 GC |
88 | retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] + |
89 | kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; | |
3e00a5ae BH |
90 | |
91 | if (rackmeter_ignore_nice) | |
3292beb3 | 92 | retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; |
3e00a5ae BH |
93 | |
94 | return retval; | |
95 | } | |
96 | ||
97 | static void rackmeter_setup_i2s(struct rackmeter *rm) | |
98 | { | |
99 | struct macio_chip *macio = rm->mdev->bus->chip; | |
100 | ||
101 | /* First whack magic GPIO */ | |
102 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5); | |
103 | ||
104 | ||
105 | /* Call feature code to enable the sound channel and the proper | |
106 | * clock sources | |
107 | */ | |
108 | pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1); | |
109 | ||
110 | /* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now. | |
111 | * This is a bit racy, thus we should add new platform functions to | |
112 | * handle that. snd-aoa needs that too | |
113 | */ | |
114 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE); | |
115 | MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT); | |
116 | (void)MACIO_IN32(KEYLARGO_FCR1); | |
117 | udelay(10); | |
118 | ||
119 | /* Then setup i2s. For now, we use the same magic value that | |
120 | * the OS X driver seems to use. We might want to play around | |
121 | * with the clock divisors later | |
122 | */ | |
123 | out_le32(rm->i2s_regs + 0x10, 0x01fa0000); | |
124 | (void)in_le32(rm->i2s_regs + 0x10); | |
125 | udelay(10); | |
126 | ||
127 | /* Fully restart i2s*/ | |
128 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE | | |
129 | KL1_I2S0_CLK_ENABLE_BIT); | |
130 | (void)MACIO_IN32(KEYLARGO_FCR1); | |
131 | udelay(10); | |
132 | } | |
133 | ||
134 | static void rackmeter_set_default_pattern(struct rackmeter *rm) | |
135 | { | |
136 | int i; | |
137 | ||
138 | for (i = 0; i < 16; i++) { | |
139 | if (i < 8) | |
140 | rm->ubuf[i] = (i & 1) * 255; | |
141 | else | |
142 | rm->ubuf[i] = ((~i) & 1) * 255; | |
143 | } | |
144 | } | |
145 | ||
146 | static void rackmeter_do_pause(struct rackmeter *rm, int pause) | |
147 | { | |
148 | struct rackmeter_dma *rdma = rm->dma_buf_v; | |
149 | ||
150 | pr_debug("rackmeter: %s\n", pause ? "paused" : "started"); | |
151 | ||
152 | rm->paused = pause; | |
153 | if (pause) { | |
154 | DBDMA_DO_STOP(rm->dma_regs); | |
155 | return; | |
156 | } | |
157 | memset(rdma->buf1, 0, SAMPLE_COUNT & sizeof(u32)); | |
158 | memset(rdma->buf2, 0, SAMPLE_COUNT & sizeof(u32)); | |
159 | ||
160 | rm->dma_buf_v->mark = 0; | |
161 | ||
162 | mb(); | |
163 | out_le32(&rm->dma_regs->cmdptr_hi, 0); | |
164 | out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p); | |
165 | out_le32(&rm->dma_regs->control, (RUN << 16) | RUN); | |
166 | } | |
167 | ||
168 | static void rackmeter_setup_dbdma(struct rackmeter *rm) | |
169 | { | |
170 | struct rackmeter_dma *db = rm->dma_buf_v; | |
171 | struct dbdma_cmd *cmd = db->cmd; | |
172 | ||
173 | /* Make sure dbdma is reset */ | |
174 | DBDMA_DO_RESET(rm->dma_regs); | |
175 | ||
193d0732 | 176 | pr_debug("rackmeter: mark offset=0x%zx\n", |
3e00a5ae | 177 | offsetof(struct rackmeter_dma, mark)); |
193d0732 | 178 | pr_debug("rackmeter: buf1 offset=0x%zx\n", |
3e00a5ae | 179 | offsetof(struct rackmeter_dma, buf1)); |
193d0732 | 180 | pr_debug("rackmeter: buf2 offset=0x%zx\n", |
3e00a5ae BH |
181 | offsetof(struct rackmeter_dma, buf2)); |
182 | ||
183 | /* Prepare 4 dbdma commands for the 2 buffers */ | |
184 | memset(cmd, 0, 4 * sizeof(struct dbdma_cmd)); | |
185 | st_le16(&cmd->req_count, 4); | |
186 | st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
187 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
188 | offsetof(struct rackmeter_dma, mark)); | |
189 | st_le32(&cmd->cmd_dep, 0x02000000); | |
190 | cmd++; | |
191 | ||
192 | st_le16(&cmd->req_count, SAMPLE_COUNT * 4); | |
193 | st_le16(&cmd->command, OUTPUT_MORE); | |
194 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
195 | offsetof(struct rackmeter_dma, buf1)); | |
196 | cmd++; | |
197 | ||
198 | st_le16(&cmd->req_count, 4); | |
199 | st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
200 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
201 | offsetof(struct rackmeter_dma, mark)); | |
202 | st_le32(&cmd->cmd_dep, 0x01000000); | |
203 | cmd++; | |
204 | ||
205 | st_le16(&cmd->req_count, SAMPLE_COUNT * 4); | |
206 | st_le16(&cmd->command, OUTPUT_MORE | BR_ALWAYS); | |
207 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
208 | offsetof(struct rackmeter_dma, buf2)); | |
209 | st_le32(&cmd->cmd_dep, rm->dma_buf_p); | |
210 | ||
211 | rackmeter_do_pause(rm, 0); | |
212 | } | |
213 | ||
6d5aefb8 | 214 | static void rackmeter_do_timer(struct work_struct *work) |
3e00a5ae | 215 | { |
6d5aefb8 DH |
216 | struct rackmeter_cpu *rcpu = |
217 | container_of(work, struct rackmeter_cpu, sniffer.work); | |
218 | struct rackmeter *rm = rcpu->rm; | |
3e00a5ae | 219 | unsigned int cpu = smp_processor_id(); |
3e00a5ae BH |
220 | cputime64_t cur_jiffies, total_idle_ticks; |
221 | unsigned int total_ticks, idle_ticks; | |
222 | int i, offset, load, cumm, pause; | |
223 | ||
224 | cur_jiffies = jiffies64_to_cputime64(get_jiffies_64()); | |
64861634 | 225 | total_ticks = (unsigned int) (cur_jiffies - rcpu->prev_wall); |
3e00a5ae BH |
226 | rcpu->prev_wall = cur_jiffies; |
227 | ||
228 | total_idle_ticks = get_cpu_idle_time(cpu); | |
64861634 | 229 | idle_ticks = (unsigned int) (total_idle_ticks - rcpu->prev_idle); |
3e00a5ae BH |
230 | rcpu->prev_idle = total_idle_ticks; |
231 | ||
232 | /* We do a very dumb calculation to update the LEDs for now, | |
233 | * we'll do better once we have actual PWM implemented | |
234 | */ | |
235 | load = (9 * (total_ticks - idle_ticks)) / total_ticks; | |
236 | ||
237 | offset = cpu << 3; | |
238 | cumm = 0; | |
239 | for (i = 0; i < 8; i++) { | |
240 | u8 ub = (load > i) ? 0xff : 0; | |
241 | rm->ubuf[i + offset] = ub; | |
242 | cumm |= ub; | |
243 | } | |
244 | rcpu->zero = (cumm == 0); | |
245 | ||
246 | /* Now check if LEDs are all 0, we can stop DMA */ | |
247 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
248 | if (pause != rm->paused) { | |
249 | mutex_lock(&rm->sem); | |
250 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
251 | rackmeter_do_pause(rm, pause); | |
252 | mutex_unlock(&rm->sem); | |
253 | } | |
254 | schedule_delayed_work_on(cpu, &rcpu->sniffer, | |
255 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
256 | } | |
257 | ||
1da42fb6 | 258 | static void rackmeter_init_cpu_sniffer(struct rackmeter *rm) |
3e00a5ae BH |
259 | { |
260 | unsigned int cpu; | |
261 | ||
262 | /* This driver works only with 1 or 2 CPUs numbered 0 and 1, | |
263 | * but that's really all we have on Apple Xserve. It doesn't | |
264 | * play very nice with CPU hotplug neither but we don't do that | |
265 | * on those machines yet | |
266 | */ | |
267 | ||
6d5aefb8 DH |
268 | rm->cpu[0].rm = rm; |
269 | INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer); | |
270 | rm->cpu[1].rm = rm; | |
271 | INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer); | |
3e00a5ae BH |
272 | |
273 | for_each_online_cpu(cpu) { | |
274 | struct rackmeter_cpu *rcpu; | |
275 | ||
276 | if (cpu > 1) | |
277 | continue; | |
a419aef8 | 278 | rcpu = &rm->cpu[cpu]; |
3e00a5ae BH |
279 | rcpu->prev_idle = get_cpu_idle_time(cpu); |
280 | rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64()); | |
281 | schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer, | |
282 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
283 | } | |
284 | } | |
285 | ||
e1f4dea4 | 286 | static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm) |
3e00a5ae | 287 | { |
afe2c511 TH |
288 | cancel_delayed_work_sync(&rm->cpu[0].sniffer); |
289 | cancel_delayed_work_sync(&rm->cpu[1].sniffer); | |
3e00a5ae BH |
290 | } |
291 | ||
1da42fb6 | 292 | static int rackmeter_setup(struct rackmeter *rm) |
3e00a5ae BH |
293 | { |
294 | pr_debug("rackmeter: setting up i2s..\n"); | |
295 | rackmeter_setup_i2s(rm); | |
296 | ||
297 | pr_debug("rackmeter: setting up default pattern..\n"); | |
298 | rackmeter_set_default_pattern(rm); | |
299 | ||
300 | pr_debug("rackmeter: setting up dbdma..\n"); | |
301 | rackmeter_setup_dbdma(rm); | |
302 | ||
303 | pr_debug("rackmeter: start CPU measurements..\n"); | |
304 | rackmeter_init_cpu_sniffer(rm); | |
305 | ||
306 | printk(KERN_INFO "RackMeter initialized\n"); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | /* XXX FIXME: No PWM yet, this is 0/1 */ | |
312 | static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index) | |
313 | { | |
314 | int led; | |
315 | u32 sample = 0; | |
316 | ||
317 | for (led = 0; led < 16; led++) { | |
318 | sample >>= 1; | |
319 | sample |= ((rm->ubuf[led] >= 0x80) << 15); | |
320 | } | |
321 | return (sample << 17) | (sample >> 15); | |
322 | } | |
323 | ||
324 | static irqreturn_t rackmeter_irq(int irq, void *arg) | |
325 | { | |
326 | struct rackmeter *rm = arg; | |
327 | struct rackmeter_dma *db = rm->dma_buf_v; | |
328 | unsigned int mark, i; | |
329 | u32 *buf; | |
330 | ||
331 | /* Flush PCI buffers with an MMIO read. Maybe we could actually | |
332 | * check the status one day ... in case things go wrong, though | |
333 | * this never happened to me | |
334 | */ | |
335 | (void)in_le32(&rm->dma_regs->status); | |
336 | ||
337 | /* Make sure the CPU gets us in order */ | |
338 | rmb(); | |
339 | ||
340 | /* Read mark */ | |
341 | mark = db->mark; | |
342 | if (mark != 1 && mark != 2) { | |
343 | printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n", | |
344 | mark); | |
345 | /* We allow for 3 errors like that (stale DBDMA irqs) */ | |
346 | if (++rm->stale_irq > 3) { | |
347 | printk(KERN_ERR "rackmeter: Too many errors," | |
348 | " stopping DMA\n"); | |
349 | DBDMA_DO_RESET(rm->dma_regs); | |
350 | } | |
351 | return IRQ_HANDLED; | |
352 | } | |
353 | ||
354 | /* Next buffer we need to fill is mark value */ | |
355 | buf = mark == 1 ? db->buf1 : db->buf2; | |
356 | ||
357 | /* Fill it now. This routine converts the 8 bits depth sample array | |
358 | * into the PWM bitmap for each LED. | |
359 | */ | |
360 | for (i = 0; i < SAMPLE_COUNT; i++) | |
361 | buf[i] = rackmeter_calc_sample(rm, i); | |
362 | ||
363 | ||
364 | return IRQ_HANDLED; | |
365 | } | |
366 | ||
1da42fb6 GKH |
367 | static int rackmeter_probe(struct macio_dev* mdev, |
368 | const struct of_device_id *match) | |
3e00a5ae BH |
369 | { |
370 | struct device_node *i2s = NULL, *np = NULL; | |
371 | struct rackmeter *rm = NULL; | |
372 | struct resource ri2s, rdma; | |
373 | int rc = -ENODEV; | |
374 | ||
375 | pr_debug("rackmeter_probe()\n"); | |
376 | ||
377 | /* Get i2s-a node */ | |
61c7a080 | 378 | while ((i2s = of_get_next_child(mdev->ofdev.dev.of_node, i2s)) != NULL) |
3e00a5ae BH |
379 | if (strcmp(i2s->name, "i2s-a") == 0) |
380 | break; | |
381 | if (i2s == NULL) { | |
382 | pr_debug(" i2s-a child not found\n"); | |
383 | goto bail; | |
384 | } | |
385 | /* Get lightshow or virtual sound */ | |
386 | while ((np = of_get_next_child(i2s, np)) != NULL) { | |
387 | if (strcmp(np->name, "lightshow") == 0) | |
388 | break; | |
389 | if ((strcmp(np->name, "sound") == 0) && | |
01b2726d | 390 | of_get_property(np, "virtual", NULL) != NULL) |
3e00a5ae BH |
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(sizeof(struct rackmeter), 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(&mdev->ofdev.dev, 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: %s" | |
414 | " (%d resources, %d interrupts)\n", | |
415 | mdev->ofdev.node->full_name); | |
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: %s\n", | |
422 | mdev->ofdev.node->full_name); | |
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(i2s, 1); | |
429 | if (rm->irq == NO_IRQ || | |
430 | of_address_to_resource(i2s, 0, &ri2s) || | |
431 | of_address_to_resource(i2s, 1, &rdma)) { | |
432 | printk(KERN_ERR | |
433 | "rackmeter: found match but lacks resources: %s", | |
61c7a080 | 434 | mdev->ofdev.dev.of_node->full_name); |
3e00a5ae BH |
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(&macio_get_pci_dev(mdev)->dev, | |
453 | sizeof(struct rackmeter_dma), | |
454 | &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(ri2s.start, 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(rdma.start, 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(rm->irq, rackmeter_irq, 0, "rackmeter", 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(np); | |
499 | return 0; | |
500 | ||
501 | bail_stop_dma: | |
502 | DBDMA_DO_RESET(rm->dma_regs); | |
503 | bail_unmap_dma: | |
504 | iounmap(rm->dma_regs); | |
505 | bail_unmap_i2s: | |
506 | iounmap(rm->i2s_regs); | |
507 | bail_free_dma: | |
508 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
509 | sizeof(struct rackmeter_dma), | |
510 | rm->dma_buf_v, 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(rm); | |
519 | bail: | |
520 | of_node_put(i2s); | |
521 | of_node_put(np); | |
522 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
523 | return rc; | |
524 | } | |
525 | ||
1da42fb6 | 526 | static int rackmeter_remove(struct macio_dev* mdev) |
3e00a5ae BH |
527 | { |
528 | struct rackmeter *rm = dev_get_drvdata(&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(&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(rm->dma_regs); | |
544 | iounmap(rm->i2s_regs); | |
545 | ||
546 | /* Free DMA */ | |
547 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
548 | sizeof(struct rackmeter_dma), | |
549 | rm->dma_buf_v, 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(rm); | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | static int rackmeter_shutdown(struct macio_dev* mdev) | |
566 | { | |
567 | struct rackmeter *rm = dev_get_drvdata(&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 struct of_device_id rackmeter_match[] = { | |
582 | { .name = "i2s" }, | |
583 | { } | |
584 | }; | |
585 | ||
31421a6f | 586 | static struct macio_driver rackmeter_driver = { |
c2cdf6ab BH |
587 | .driver = { |
588 | .name = "rackmeter", | |
589 | .owner = THIS_MODULE, | |
590 | .of_match_table = rackmeter_match, | |
591 | }, | |
3e00a5ae | 592 | .probe = rackmeter_probe, |
1da42fb6 | 593 | .remove = rackmeter_remove, |
3e00a5ae BH |
594 | .shutdown = rackmeter_shutdown, |
595 | }; | |
596 | ||
597 | ||
598 | static int __init rackmeter_init(void) | |
599 | { | |
600 | pr_debug("rackmeter_init()\n"); | |
601 | ||
31421a6f | 602 | return macio_register_driver(&rackmeter_driver); |
3e00a5ae BH |
603 | } |
604 | ||
605 | static void __exit rackmeter_exit(void) | |
606 | { | |
607 | pr_debug("rackmeter_exit()\n"); | |
608 | ||
31421a6f | 609 | macio_unregister_driver(&rackmeter_driver); |
3e00a5ae BH |
610 | } |
611 | ||
612 | module_init(rackmeter_init); | |
613 | module_exit(rackmeter_exit); | |
614 | ||
615 | ||
616 | MODULE_LICENSE("GPL"); | |
617 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
618 | MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel"); |