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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 | { | |
3292beb3 | 84 | u64 retval; |
3e00a5ae | 85 | |
3292beb3 GC |
86 | retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] + |
87 | kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; | |
3e00a5ae BH |
88 | |
89 | if (rackmeter_ignore_nice) | |
3292beb3 | 90 | retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; |
3e00a5ae BH |
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, SAMPLE_COUNT & sizeof(u32)); | |
156 | memset(rdma->buf2, 0, SAMPLE_COUNT & sizeof(u32)); | |
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 | ||
193d0732 | 174 | pr_debug("rackmeter: mark offset=0x%zx\n", |
3e00a5ae | 175 | offsetof(struct rackmeter_dma, mark)); |
193d0732 | 176 | pr_debug("rackmeter: buf1 offset=0x%zx\n", |
3e00a5ae | 177 | offsetof(struct rackmeter_dma, buf1)); |
193d0732 | 178 | pr_debug("rackmeter: buf2 offset=0x%zx\n", |
3e00a5ae BH |
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 | st_le16(&cmd->req_count, 4); | |
184 | st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
185 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
186 | offsetof(struct rackmeter_dma, mark)); | |
187 | st_le32(&cmd->cmd_dep, 0x02000000); | |
188 | cmd++; | |
189 | ||
190 | st_le16(&cmd->req_count, SAMPLE_COUNT * 4); | |
191 | st_le16(&cmd->command, OUTPUT_MORE); | |
192 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
193 | offsetof(struct rackmeter_dma, buf1)); | |
194 | cmd++; | |
195 | ||
196 | st_le16(&cmd->req_count, 4); | |
197 | st_le16(&cmd->command, STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
198 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
199 | offsetof(struct rackmeter_dma, mark)); | |
200 | st_le32(&cmd->cmd_dep, 0x01000000); | |
201 | cmd++; | |
202 | ||
203 | st_le16(&cmd->req_count, SAMPLE_COUNT * 4); | |
204 | st_le16(&cmd->command, OUTPUT_MORE | BR_ALWAYS); | |
205 | st_le32(&cmd->phy_addr, rm->dma_buf_p + | |
206 | offsetof(struct rackmeter_dma, buf2)); | |
207 | st_le32(&cmd->cmd_dep, rm->dma_buf_p); | |
208 | ||
209 | rackmeter_do_pause(rm, 0); | |
210 | } | |
211 | ||
6d5aefb8 | 212 | static void rackmeter_do_timer(struct work_struct *work) |
3e00a5ae | 213 | { |
6d5aefb8 DH |
214 | struct rackmeter_cpu *rcpu = |
215 | container_of(work, struct rackmeter_cpu, sniffer.work); | |
216 | struct rackmeter *rm = rcpu->rm; | |
3e00a5ae | 217 | unsigned int cpu = smp_processor_id(); |
3e00a5ae BH |
218 | cputime64_t cur_jiffies, total_idle_ticks; |
219 | unsigned int total_ticks, idle_ticks; | |
220 | int i, offset, load, cumm, pause; | |
221 | ||
222 | cur_jiffies = jiffies64_to_cputime64(get_jiffies_64()); | |
64861634 | 223 | total_ticks = (unsigned int) (cur_jiffies - rcpu->prev_wall); |
3e00a5ae BH |
224 | rcpu->prev_wall = cur_jiffies; |
225 | ||
226 | total_idle_ticks = get_cpu_idle_time(cpu); | |
64861634 | 227 | idle_ticks = (unsigned int) (total_idle_ticks - rcpu->prev_idle); |
3e00a5ae BH |
228 | rcpu->prev_idle = total_idle_ticks; |
229 | ||
230 | /* We do a very dumb calculation to update the LEDs for now, | |
231 | * we'll do better once we have actual PWM implemented | |
232 | */ | |
233 | load = (9 * (total_ticks - idle_ticks)) / total_ticks; | |
234 | ||
235 | offset = cpu << 3; | |
236 | cumm = 0; | |
237 | for (i = 0; i < 8; i++) { | |
238 | u8 ub = (load > i) ? 0xff : 0; | |
239 | rm->ubuf[i + offset] = ub; | |
240 | cumm |= ub; | |
241 | } | |
242 | rcpu->zero = (cumm == 0); | |
243 | ||
244 | /* Now check if LEDs are all 0, we can stop DMA */ | |
245 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
246 | if (pause != rm->paused) { | |
247 | mutex_lock(&rm->sem); | |
248 | pause = (rm->cpu[0].zero && rm->cpu[1].zero); | |
249 | rackmeter_do_pause(rm, pause); | |
250 | mutex_unlock(&rm->sem); | |
251 | } | |
252 | schedule_delayed_work_on(cpu, &rcpu->sniffer, | |
253 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
254 | } | |
255 | ||
1da42fb6 | 256 | static void rackmeter_init_cpu_sniffer(struct rackmeter *rm) |
3e00a5ae BH |
257 | { |
258 | unsigned int cpu; | |
259 | ||
260 | /* This driver works only with 1 or 2 CPUs numbered 0 and 1, | |
261 | * but that's really all we have on Apple Xserve. It doesn't | |
262 | * play very nice with CPU hotplug neither but we don't do that | |
263 | * on those machines yet | |
264 | */ | |
265 | ||
6d5aefb8 DH |
266 | rm->cpu[0].rm = rm; |
267 | INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer); | |
268 | rm->cpu[1].rm = rm; | |
269 | INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer); | |
3e00a5ae BH |
270 | |
271 | for_each_online_cpu(cpu) { | |
272 | struct rackmeter_cpu *rcpu; | |
273 | ||
274 | if (cpu > 1) | |
275 | continue; | |
a419aef8 | 276 | rcpu = &rm->cpu[cpu]; |
3e00a5ae BH |
277 | rcpu->prev_idle = get_cpu_idle_time(cpu); |
278 | rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64()); | |
279 | schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer, | |
280 | msecs_to_jiffies(CPU_SAMPLING_RATE)); | |
281 | } | |
282 | } | |
283 | ||
e1f4dea4 | 284 | static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm) |
3e00a5ae | 285 | { |
afe2c511 TH |
286 | cancel_delayed_work_sync(&rm->cpu[0].sniffer); |
287 | cancel_delayed_work_sync(&rm->cpu[1].sniffer); | |
3e00a5ae BH |
288 | } |
289 | ||
1da42fb6 | 290 | static int rackmeter_setup(struct rackmeter *rm) |
3e00a5ae BH |
291 | { |
292 | pr_debug("rackmeter: setting up i2s..\n"); | |
293 | rackmeter_setup_i2s(rm); | |
294 | ||
295 | pr_debug("rackmeter: setting up default pattern..\n"); | |
296 | rackmeter_set_default_pattern(rm); | |
297 | ||
298 | pr_debug("rackmeter: setting up dbdma..\n"); | |
299 | rackmeter_setup_dbdma(rm); | |
300 | ||
301 | pr_debug("rackmeter: start CPU measurements..\n"); | |
302 | rackmeter_init_cpu_sniffer(rm); | |
303 | ||
304 | printk(KERN_INFO "RackMeter initialized\n"); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | /* XXX FIXME: No PWM yet, this is 0/1 */ | |
310 | static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index) | |
311 | { | |
312 | int led; | |
313 | u32 sample = 0; | |
314 | ||
315 | for (led = 0; led < 16; led++) { | |
316 | sample >>= 1; | |
317 | sample |= ((rm->ubuf[led] >= 0x80) << 15); | |
318 | } | |
319 | return (sample << 17) | (sample >> 15); | |
320 | } | |
321 | ||
322 | static irqreturn_t rackmeter_irq(int irq, void *arg) | |
323 | { | |
324 | struct rackmeter *rm = arg; | |
325 | struct rackmeter_dma *db = rm->dma_buf_v; | |
326 | unsigned int mark, i; | |
327 | u32 *buf; | |
328 | ||
329 | /* Flush PCI buffers with an MMIO read. Maybe we could actually | |
330 | * check the status one day ... in case things go wrong, though | |
331 | * this never happened to me | |
332 | */ | |
333 | (void)in_le32(&rm->dma_regs->status); | |
334 | ||
335 | /* Make sure the CPU gets us in order */ | |
336 | rmb(); | |
337 | ||
338 | /* Read mark */ | |
339 | mark = db->mark; | |
340 | if (mark != 1 && mark != 2) { | |
341 | printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n", | |
342 | mark); | |
343 | /* We allow for 3 errors like that (stale DBDMA irqs) */ | |
344 | if (++rm->stale_irq > 3) { | |
345 | printk(KERN_ERR "rackmeter: Too many errors," | |
346 | " stopping DMA\n"); | |
347 | DBDMA_DO_RESET(rm->dma_regs); | |
348 | } | |
349 | return IRQ_HANDLED; | |
350 | } | |
351 | ||
352 | /* Next buffer we need to fill is mark value */ | |
353 | buf = mark == 1 ? db->buf1 : db->buf2; | |
354 | ||
355 | /* Fill it now. This routine converts the 8 bits depth sample array | |
356 | * into the PWM bitmap for each LED. | |
357 | */ | |
358 | for (i = 0; i < SAMPLE_COUNT; i++) | |
359 | buf[i] = rackmeter_calc_sample(rm, i); | |
360 | ||
361 | ||
362 | return IRQ_HANDLED; | |
363 | } | |
364 | ||
1da42fb6 GKH |
365 | static int rackmeter_probe(struct macio_dev* mdev, |
366 | const struct of_device_id *match) | |
3e00a5ae BH |
367 | { |
368 | struct device_node *i2s = NULL, *np = NULL; | |
369 | struct rackmeter *rm = NULL; | |
370 | struct resource ri2s, rdma; | |
371 | int rc = -ENODEV; | |
372 | ||
373 | pr_debug("rackmeter_probe()\n"); | |
374 | ||
375 | /* Get i2s-a node */ | |
61c7a080 | 376 | while ((i2s = of_get_next_child(mdev->ofdev.dev.of_node, i2s)) != NULL) |
3e00a5ae BH |
377 | if (strcmp(i2s->name, "i2s-a") == 0) |
378 | break; | |
379 | if (i2s == NULL) { | |
380 | pr_debug(" i2s-a child not found\n"); | |
381 | goto bail; | |
382 | } | |
383 | /* Get lightshow or virtual sound */ | |
384 | while ((np = of_get_next_child(i2s, np)) != NULL) { | |
385 | if (strcmp(np->name, "lightshow") == 0) | |
386 | break; | |
387 | if ((strcmp(np->name, "sound") == 0) && | |
01b2726d | 388 | of_get_property(np, "virtual", NULL) != NULL) |
3e00a5ae BH |
389 | break; |
390 | } | |
391 | if (np == NULL) { | |
392 | pr_debug(" lightshow or sound+virtual child not found\n"); | |
393 | goto bail; | |
394 | } | |
395 | ||
396 | /* Create and initialize our instance data */ | |
397 | rm = kzalloc(sizeof(struct rackmeter), GFP_KERNEL); | |
398 | if (rm == NULL) { | |
399 | printk(KERN_ERR "rackmeter: failed to allocate memory !\n"); | |
400 | rc = -ENOMEM; | |
401 | goto bail_release; | |
402 | } | |
403 | rm->mdev = mdev; | |
404 | rm->i2s = i2s; | |
405 | mutex_init(&rm->sem); | |
406 | dev_set_drvdata(&mdev->ofdev.dev, rm); | |
407 | /* Check resources availability. We need at least resource 0 and 1 */ | |
408 | #if 0 /* Use that when i2s-a is finally an mdev per-se */ | |
409 | if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) { | |
410 | printk(KERN_ERR | |
411 | "rackmeter: found match but lacks resources: %s" | |
412 | " (%d resources, %d interrupts)\n", | |
413 | mdev->ofdev.node->full_name); | |
414 | rc = -ENXIO; | |
415 | goto bail_free; | |
416 | } | |
417 | if (macio_request_resources(mdev, "rackmeter")) { | |
418 | printk(KERN_ERR | |
419 | "rackmeter: failed to request resources: %s\n", | |
420 | mdev->ofdev.node->full_name); | |
421 | rc = -EBUSY; | |
422 | goto bail_free; | |
423 | } | |
424 | rm->irq = macio_irq(mdev, 1); | |
425 | #else | |
426 | rm->irq = irq_of_parse_and_map(i2s, 1); | |
427 | if (rm->irq == NO_IRQ || | |
428 | of_address_to_resource(i2s, 0, &ri2s) || | |
429 | of_address_to_resource(i2s, 1, &rdma)) { | |
430 | printk(KERN_ERR | |
431 | "rackmeter: found match but lacks resources: %s", | |
61c7a080 | 432 | mdev->ofdev.dev.of_node->full_name); |
3e00a5ae BH |
433 | rc = -ENXIO; |
434 | goto bail_free; | |
435 | } | |
436 | #endif | |
437 | ||
438 | pr_debug(" i2s @0x%08x\n", (unsigned int)ri2s.start); | |
439 | pr_debug(" dma @0x%08x\n", (unsigned int)rdma.start); | |
440 | pr_debug(" irq %d\n", rm->irq); | |
441 | ||
442 | rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL); | |
443 | if (rm->ubuf == NULL) { | |
444 | printk(KERN_ERR | |
445 | "rackmeter: failed to allocate samples page !\n"); | |
446 | rc = -ENOMEM; | |
447 | goto bail_release; | |
448 | } | |
449 | ||
450 | rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev, | |
451 | sizeof(struct rackmeter_dma), | |
452 | &rm->dma_buf_p, GFP_KERNEL); | |
453 | if (rm->dma_buf_v == NULL) { | |
454 | printk(KERN_ERR | |
455 | "rackmeter: failed to allocate dma buffer !\n"); | |
456 | rc = -ENOMEM; | |
457 | goto bail_free_samples; | |
458 | } | |
459 | #if 0 | |
460 | rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000); | |
461 | #else | |
462 | rm->i2s_regs = ioremap(ri2s.start, 0x1000); | |
463 | #endif | |
464 | if (rm->i2s_regs == NULL) { | |
465 | printk(KERN_ERR | |
466 | "rackmeter: failed to map i2s registers !\n"); | |
467 | rc = -ENXIO; | |
468 | goto bail_free_dma; | |
469 | } | |
470 | #if 0 | |
471 | rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100); | |
472 | #else | |
473 | rm->dma_regs = ioremap(rdma.start, 0x100); | |
474 | #endif | |
475 | if (rm->dma_regs == NULL) { | |
476 | printk(KERN_ERR | |
477 | "rackmeter: failed to map dma registers !\n"); | |
478 | rc = -ENXIO; | |
479 | goto bail_unmap_i2s; | |
480 | } | |
481 | ||
482 | rc = rackmeter_setup(rm); | |
483 | if (rc) { | |
484 | printk(KERN_ERR | |
485 | "rackmeter: failed to initialize !\n"); | |
486 | rc = -ENXIO; | |
487 | goto bail_unmap_dma; | |
488 | } | |
489 | ||
490 | rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm); | |
491 | if (rc != 0) { | |
492 | printk(KERN_ERR | |
493 | "rackmeter: failed to request interrupt !\n"); | |
494 | goto bail_stop_dma; | |
495 | } | |
496 | of_node_put(np); | |
497 | return 0; | |
498 | ||
499 | bail_stop_dma: | |
500 | DBDMA_DO_RESET(rm->dma_regs); | |
501 | bail_unmap_dma: | |
502 | iounmap(rm->dma_regs); | |
503 | bail_unmap_i2s: | |
504 | iounmap(rm->i2s_regs); | |
505 | bail_free_dma: | |
506 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
507 | sizeof(struct rackmeter_dma), | |
508 | rm->dma_buf_v, rm->dma_buf_p); | |
509 | bail_free_samples: | |
510 | free_page((unsigned long)rm->ubuf); | |
511 | bail_release: | |
512 | #if 0 | |
513 | macio_release_resources(mdev); | |
514 | #endif | |
515 | bail_free: | |
516 | kfree(rm); | |
517 | bail: | |
518 | of_node_put(i2s); | |
519 | of_node_put(np); | |
520 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
521 | return rc; | |
522 | } | |
523 | ||
1da42fb6 | 524 | static int rackmeter_remove(struct macio_dev* mdev) |
3e00a5ae BH |
525 | { |
526 | struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); | |
527 | ||
528 | /* Stop CPU sniffer timer & work queues */ | |
529 | rackmeter_stop_cpu_sniffer(rm); | |
530 | ||
531 | /* Clear reference to private data */ | |
532 | dev_set_drvdata(&mdev->ofdev.dev, NULL); | |
533 | ||
534 | /* Stop/reset dbdma */ | |
535 | DBDMA_DO_RESET(rm->dma_regs); | |
536 | ||
537 | /* Release the IRQ */ | |
538 | free_irq(rm->irq, rm); | |
539 | ||
540 | /* Unmap registers */ | |
541 | iounmap(rm->dma_regs); | |
542 | iounmap(rm->i2s_regs); | |
543 | ||
544 | /* Free DMA */ | |
545 | dma_free_coherent(&macio_get_pci_dev(mdev)->dev, | |
546 | sizeof(struct rackmeter_dma), | |
547 | rm->dma_buf_v, rm->dma_buf_p); | |
548 | ||
549 | /* Free samples */ | |
550 | free_page((unsigned long)rm->ubuf); | |
551 | ||
552 | #if 0 | |
553 | /* Release resources */ | |
554 | macio_release_resources(mdev); | |
555 | #endif | |
556 | ||
557 | /* Get rid of me */ | |
558 | kfree(rm); | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | static int rackmeter_shutdown(struct macio_dev* mdev) | |
564 | { | |
565 | struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev); | |
566 | ||
567 | if (rm == NULL) | |
568 | return -ENODEV; | |
569 | ||
570 | /* Stop CPU sniffer timer & work queues */ | |
571 | rackmeter_stop_cpu_sniffer(rm); | |
572 | ||
573 | /* Stop/reset dbdma */ | |
574 | DBDMA_DO_RESET(rm->dma_regs); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | static struct of_device_id rackmeter_match[] = { | |
580 | { .name = "i2s" }, | |
581 | { } | |
582 | }; | |
583 | ||
31421a6f | 584 | static struct macio_driver rackmeter_driver = { |
c2cdf6ab BH |
585 | .driver = { |
586 | .name = "rackmeter", | |
587 | .owner = THIS_MODULE, | |
588 | .of_match_table = rackmeter_match, | |
589 | }, | |
3e00a5ae | 590 | .probe = rackmeter_probe, |
1da42fb6 | 591 | .remove = rackmeter_remove, |
3e00a5ae BH |
592 | .shutdown = rackmeter_shutdown, |
593 | }; | |
594 | ||
595 | ||
596 | static int __init rackmeter_init(void) | |
597 | { | |
598 | pr_debug("rackmeter_init()\n"); | |
599 | ||
31421a6f | 600 | return macio_register_driver(&rackmeter_driver); |
3e00a5ae BH |
601 | } |
602 | ||
603 | static void __exit rackmeter_exit(void) | |
604 | { | |
605 | pr_debug("rackmeter_exit()\n"); | |
606 | ||
31421a6f | 607 | macio_unregister_driver(&rackmeter_driver); |
3e00a5ae BH |
608 | } |
609 | ||
610 | module_init(rackmeter_init); | |
611 | module_exit(rackmeter_exit); | |
612 | ||
613 | ||
614 | MODULE_LICENSE("GPL"); | |
615 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
616 | MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel"); |