blob: 465c52219639a0e5324499892addf1a3a6df6739 [file] [log] [blame]
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +11001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110022#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>
Rob Herring5af50732013-09-17 14:28:33 -050028#include <linux/of_address.h>
29#include <linux/of_irq.h>
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110030
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>
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110036#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
45struct 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
52struct rackmeter_cpu {
David Howells6d5aefb2006-12-05 19:36:26 +000053 struct delayed_work sniffer;
54 struct rackmeter *rm;
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110055 cputime64_t prev_wall;
56 cputime64_t prev_idle;
57 int zero;
58} ____cacheline_aligned;
59
60struct 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 */
76static 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 */
84static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
85{
Glauber Costa3292beb2011-11-28 14:45:17 -020086 u64 retval;
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110087
Glauber Costa3292beb2011-11-28 14:45:17 -020088 retval = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE] +
89 kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110090
91 if (rackmeter_ignore_nice)
Glauber Costa3292beb2011-11-28 14:45:17 -020092 retval += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +110093
94 return retval;
95}
96
97static 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
134static 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
146static 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 }
Aaro Koskinen4f7bef72016-04-10 22:53:48 +0300157 memset(rdma->buf1, 0, ARRAY_SIZE(rdma->buf1));
158 memset(rdma->buf2, 0, ARRAY_SIZE(rdma->buf2));
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100159
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
168static 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
Al Viro193d0732007-02-09 16:39:05 +0000176 pr_debug("rackmeter: mark offset=0x%zx\n",
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100177 offsetof(struct rackmeter_dma, mark));
Al Viro193d0732007-02-09 16:39:05 +0000178 pr_debug("rackmeter: buf1 offset=0x%zx\n",
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100179 offsetof(struct rackmeter_dma, buf1));
Al Viro193d0732007-02-09 16:39:05 +0000180 pr_debug("rackmeter: buf2 offset=0x%zx\n",
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100181 offsetof(struct rackmeter_dma, buf2));
182
183 /* Prepare 4 dbdma commands for the 2 buffers */
184 memset(cmd, 0, 4 * sizeof(struct dbdma_cmd));
David Gibsonf5718722015-02-03 16:36:21 +1100185 cmd->req_count = cpu_to_le16(4);
186 cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
187 cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100188 offsetof(struct rackmeter_dma, mark));
David Gibsonf5718722015-02-03 16:36:21 +1100189 cmd->cmd_dep = cpu_to_le32(0x02000000);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100190 cmd++;
191
David Gibsonf5718722015-02-03 16:36:21 +1100192 cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4);
193 cmd->command = cpu_to_le16(OUTPUT_MORE);
194 cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100195 offsetof(struct rackmeter_dma, buf1));
196 cmd++;
197
David Gibsonf5718722015-02-03 16:36:21 +1100198 cmd->req_count = cpu_to_le16(4);
199 cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM);
200 cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100201 offsetof(struct rackmeter_dma, mark));
David Gibsonf5718722015-02-03 16:36:21 +1100202 cmd->cmd_dep = cpu_to_le32(0x01000000);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100203 cmd++;
204
David Gibsonf5718722015-02-03 16:36:21 +1100205 cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4);
206 cmd->command = cpu_to_le16(OUTPUT_MORE | BR_ALWAYS);
207 cmd->phy_addr = cpu_to_le32(rm->dma_buf_p +
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100208 offsetof(struct rackmeter_dma, buf2));
David Gibsonf5718722015-02-03 16:36:21 +1100209 cmd->cmd_dep = cpu_to_le32(rm->dma_buf_p);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100210
211 rackmeter_do_pause(rm, 0);
212}
213
David Howells6d5aefb2006-12-05 19:36:26 +0000214static void rackmeter_do_timer(struct work_struct *work)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100215{
David Howells6d5aefb2006-12-05 19:36:26 +0000216 struct rackmeter_cpu *rcpu =
217 container_of(work, struct rackmeter_cpu, sniffer.work);
218 struct rackmeter *rm = rcpu->rm;
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100219 unsigned int cpu = smp_processor_id();
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100220 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());
Martin Schwidefsky64861632011-12-15 14:56:09 +0100225 total_ticks = (unsigned int) (cur_jiffies - rcpu->prev_wall);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100226 rcpu->prev_wall = cur_jiffies;
227
228 total_idle_ticks = get_cpu_idle_time(cpu);
Martin Schwidefsky64861632011-12-15 14:56:09 +0100229 idle_ticks = (unsigned int) (total_idle_ticks - rcpu->prev_idle);
Aaro Koskinenc796d1d92016-04-10 22:53:47 +0300230 idle_ticks = min(idle_ticks, total_ticks);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100231 rcpu->prev_idle = total_idle_ticks;
232
233 /* We do a very dumb calculation to update the LEDs for now,
234 * we'll do better once we have actual PWM implemented
235 */
236 load = (9 * (total_ticks - idle_ticks)) / total_ticks;
237
238 offset = cpu << 3;
239 cumm = 0;
240 for (i = 0; i < 8; i++) {
241 u8 ub = (load > i) ? 0xff : 0;
242 rm->ubuf[i + offset] = ub;
243 cumm |= ub;
244 }
245 rcpu->zero = (cumm == 0);
246
247 /* Now check if LEDs are all 0, we can stop DMA */
248 pause = (rm->cpu[0].zero && rm->cpu[1].zero);
249 if (pause != rm->paused) {
250 mutex_lock(&rm->sem);
251 pause = (rm->cpu[0].zero && rm->cpu[1].zero);
252 rackmeter_do_pause(rm, pause);
253 mutex_unlock(&rm->sem);
254 }
255 schedule_delayed_work_on(cpu, &rcpu->sniffer,
256 msecs_to_jiffies(CPU_SAMPLING_RATE));
257}
258
Greg Kroah-Hartman1da42fb2012-12-21 15:03:50 -0800259static void rackmeter_init_cpu_sniffer(struct rackmeter *rm)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100260{
261 unsigned int cpu;
262
263 /* This driver works only with 1 or 2 CPUs numbered 0 and 1,
264 * but that's really all we have on Apple Xserve. It doesn't
265 * play very nice with CPU hotplug neither but we don't do that
266 * on those machines yet
267 */
268
David Howells6d5aefb2006-12-05 19:36:26 +0000269 rm->cpu[0].rm = rm;
270 INIT_DELAYED_WORK(&rm->cpu[0].sniffer, rackmeter_do_timer);
271 rm->cpu[1].rm = rm;
272 INIT_DELAYED_WORK(&rm->cpu[1].sniffer, rackmeter_do_timer);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100273
274 for_each_online_cpu(cpu) {
275 struct rackmeter_cpu *rcpu;
276
277 if (cpu > 1)
278 continue;
Joe Perchesa419aef2009-08-18 11:18:35 -0700279 rcpu = &rm->cpu[cpu];
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100280 rcpu->prev_idle = get_cpu_idle_time(cpu);
281 rcpu->prev_wall = jiffies64_to_cputime64(get_jiffies_64());
282 schedule_delayed_work_on(cpu, &rm->cpu[cpu].sniffer,
283 msecs_to_jiffies(CPU_SAMPLING_RATE));
284 }
285}
286
Grant Likelye1f4dea2011-02-28 09:59:31 +0000287static void rackmeter_stop_cpu_sniffer(struct rackmeter *rm)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100288{
Tejun Heoafe2c512010-12-14 16:21:17 +0100289 cancel_delayed_work_sync(&rm->cpu[0].sniffer);
290 cancel_delayed_work_sync(&rm->cpu[1].sniffer);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100291}
292
Greg Kroah-Hartman1da42fb2012-12-21 15:03:50 -0800293static int rackmeter_setup(struct rackmeter *rm)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100294{
295 pr_debug("rackmeter: setting up i2s..\n");
296 rackmeter_setup_i2s(rm);
297
298 pr_debug("rackmeter: setting up default pattern..\n");
299 rackmeter_set_default_pattern(rm);
300
301 pr_debug("rackmeter: setting up dbdma..\n");
302 rackmeter_setup_dbdma(rm);
303
304 pr_debug("rackmeter: start CPU measurements..\n");
305 rackmeter_init_cpu_sniffer(rm);
306
307 printk(KERN_INFO "RackMeter initialized\n");
308
309 return 0;
310}
311
312/* XXX FIXME: No PWM yet, this is 0/1 */
313static u32 rackmeter_calc_sample(struct rackmeter *rm, unsigned int index)
314{
315 int led;
316 u32 sample = 0;
317
318 for (led = 0; led < 16; led++) {
319 sample >>= 1;
320 sample |= ((rm->ubuf[led] >= 0x80) << 15);
321 }
322 return (sample << 17) | (sample >> 15);
323}
324
325static irqreturn_t rackmeter_irq(int irq, void *arg)
326{
327 struct rackmeter *rm = arg;
328 struct rackmeter_dma *db = rm->dma_buf_v;
329 unsigned int mark, i;
330 u32 *buf;
331
332 /* Flush PCI buffers with an MMIO read. Maybe we could actually
333 * check the status one day ... in case things go wrong, though
334 * this never happened to me
335 */
336 (void)in_le32(&rm->dma_regs->status);
337
338 /* Make sure the CPU gets us in order */
339 rmb();
340
341 /* Read mark */
342 mark = db->mark;
343 if (mark != 1 && mark != 2) {
344 printk(KERN_WARNING "rackmeter: Incorrect DMA mark 0x%08x\n",
345 mark);
346 /* We allow for 3 errors like that (stale DBDMA irqs) */
347 if (++rm->stale_irq > 3) {
348 printk(KERN_ERR "rackmeter: Too many errors,"
349 " stopping DMA\n");
350 DBDMA_DO_RESET(rm->dma_regs);
351 }
352 return IRQ_HANDLED;
353 }
354
355 /* Next buffer we need to fill is mark value */
356 buf = mark == 1 ? db->buf1 : db->buf2;
357
358 /* Fill it now. This routine converts the 8 bits depth sample array
359 * into the PWM bitmap for each LED.
360 */
361 for (i = 0; i < SAMPLE_COUNT; i++)
362 buf[i] = rackmeter_calc_sample(rm, i);
363
364
365 return IRQ_HANDLED;
366}
367
Greg Kroah-Hartman1da42fb2012-12-21 15:03:50 -0800368static int rackmeter_probe(struct macio_dev* mdev,
369 const struct of_device_id *match)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100370{
371 struct device_node *i2s = NULL, *np = NULL;
372 struct rackmeter *rm = NULL;
373 struct resource ri2s, rdma;
374 int rc = -ENODEV;
375
376 pr_debug("rackmeter_probe()\n");
377
378 /* Get i2s-a node */
Grant Likely61c7a082010-04-13 16:12:29 -0700379 while ((i2s = of_get_next_child(mdev->ofdev.dev.of_node, i2s)) != NULL)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100380 if (strcmp(i2s->name, "i2s-a") == 0)
381 break;
382 if (i2s == NULL) {
383 pr_debug(" i2s-a child not found\n");
384 goto bail;
385 }
386 /* Get lightshow or virtual sound */
387 while ((np = of_get_next_child(i2s, np)) != NULL) {
388 if (strcmp(np->name, "lightshow") == 0)
389 break;
390 if ((strcmp(np->name, "sound") == 0) &&
Stephen Rothwell01b27262007-04-27 13:41:15 +1000391 of_get_property(np, "virtual", NULL) != NULL)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100392 break;
393 }
394 if (np == NULL) {
395 pr_debug(" lightshow or sound+virtual child not found\n");
396 goto bail;
397 }
398
399 /* Create and initialize our instance data */
400 rm = kzalloc(sizeof(struct rackmeter), GFP_KERNEL);
401 if (rm == NULL) {
402 printk(KERN_ERR "rackmeter: failed to allocate memory !\n");
403 rc = -ENOMEM;
404 goto bail_release;
405 }
406 rm->mdev = mdev;
407 rm->i2s = i2s;
408 mutex_init(&rm->sem);
409 dev_set_drvdata(&mdev->ofdev.dev, rm);
410 /* Check resources availability. We need at least resource 0 and 1 */
411#if 0 /* Use that when i2s-a is finally an mdev per-se */
412 if (macio_resource_count(mdev) < 2 || macio_irq_count(mdev) < 2) {
413 printk(KERN_ERR
414 "rackmeter: found match but lacks resources: %s"
415 " (%d resources, %d interrupts)\n",
416 mdev->ofdev.node->full_name);
417 rc = -ENXIO;
418 goto bail_free;
419 }
420 if (macio_request_resources(mdev, "rackmeter")) {
421 printk(KERN_ERR
422 "rackmeter: failed to request resources: %s\n",
423 mdev->ofdev.node->full_name);
424 rc = -EBUSY;
425 goto bail_free;
426 }
427 rm->irq = macio_irq(mdev, 1);
428#else
429 rm->irq = irq_of_parse_and_map(i2s, 1);
430 if (rm->irq == NO_IRQ ||
431 of_address_to_resource(i2s, 0, &ri2s) ||
432 of_address_to_resource(i2s, 1, &rdma)) {
433 printk(KERN_ERR
434 "rackmeter: found match but lacks resources: %s",
Grant Likely61c7a082010-04-13 16:12:29 -0700435 mdev->ofdev.dev.of_node->full_name);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100436 rc = -ENXIO;
437 goto bail_free;
438 }
439#endif
440
441 pr_debug(" i2s @0x%08x\n", (unsigned int)ri2s.start);
442 pr_debug(" dma @0x%08x\n", (unsigned int)rdma.start);
443 pr_debug(" irq %d\n", rm->irq);
444
445 rm->ubuf = (u8 *)__get_free_page(GFP_KERNEL);
446 if (rm->ubuf == NULL) {
447 printk(KERN_ERR
448 "rackmeter: failed to allocate samples page !\n");
449 rc = -ENOMEM;
450 goto bail_release;
451 }
452
453 rm->dma_buf_v = dma_alloc_coherent(&macio_get_pci_dev(mdev)->dev,
454 sizeof(struct rackmeter_dma),
455 &rm->dma_buf_p, GFP_KERNEL);
456 if (rm->dma_buf_v == NULL) {
457 printk(KERN_ERR
458 "rackmeter: failed to allocate dma buffer !\n");
459 rc = -ENOMEM;
460 goto bail_free_samples;
461 }
462#if 0
463 rm->i2s_regs = ioremap(macio_resource_start(mdev, 0), 0x1000);
464#else
465 rm->i2s_regs = ioremap(ri2s.start, 0x1000);
466#endif
467 if (rm->i2s_regs == NULL) {
468 printk(KERN_ERR
469 "rackmeter: failed to map i2s registers !\n");
470 rc = -ENXIO;
471 goto bail_free_dma;
472 }
473#if 0
474 rm->dma_regs = ioremap(macio_resource_start(mdev, 1), 0x100);
475#else
476 rm->dma_regs = ioremap(rdma.start, 0x100);
477#endif
478 if (rm->dma_regs == NULL) {
479 printk(KERN_ERR
480 "rackmeter: failed to map dma registers !\n");
481 rc = -ENXIO;
482 goto bail_unmap_i2s;
483 }
484
485 rc = rackmeter_setup(rm);
486 if (rc) {
487 printk(KERN_ERR
488 "rackmeter: failed to initialize !\n");
489 rc = -ENXIO;
490 goto bail_unmap_dma;
491 }
492
493 rc = request_irq(rm->irq, rackmeter_irq, 0, "rackmeter", rm);
494 if (rc != 0) {
495 printk(KERN_ERR
496 "rackmeter: failed to request interrupt !\n");
497 goto bail_stop_dma;
498 }
499 of_node_put(np);
500 return 0;
501
502 bail_stop_dma:
503 DBDMA_DO_RESET(rm->dma_regs);
504 bail_unmap_dma:
505 iounmap(rm->dma_regs);
506 bail_unmap_i2s:
507 iounmap(rm->i2s_regs);
508 bail_free_dma:
509 dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
510 sizeof(struct rackmeter_dma),
511 rm->dma_buf_v, rm->dma_buf_p);
512 bail_free_samples:
513 free_page((unsigned long)rm->ubuf);
514 bail_release:
515#if 0
516 macio_release_resources(mdev);
517#endif
518 bail_free:
519 kfree(rm);
520 bail:
521 of_node_put(i2s);
522 of_node_put(np);
523 dev_set_drvdata(&mdev->ofdev.dev, NULL);
524 return rc;
525}
526
Greg Kroah-Hartman1da42fb2012-12-21 15:03:50 -0800527static int rackmeter_remove(struct macio_dev* mdev)
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100528{
529 struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
530
531 /* Stop CPU sniffer timer & work queues */
532 rackmeter_stop_cpu_sniffer(rm);
533
534 /* Clear reference to private data */
535 dev_set_drvdata(&mdev->ofdev.dev, NULL);
536
537 /* Stop/reset dbdma */
538 DBDMA_DO_RESET(rm->dma_regs);
539
540 /* Release the IRQ */
541 free_irq(rm->irq, rm);
542
543 /* Unmap registers */
544 iounmap(rm->dma_regs);
545 iounmap(rm->i2s_regs);
546
547 /* Free DMA */
548 dma_free_coherent(&macio_get_pci_dev(mdev)->dev,
549 sizeof(struct rackmeter_dma),
550 rm->dma_buf_v, rm->dma_buf_p);
551
552 /* Free samples */
553 free_page((unsigned long)rm->ubuf);
554
555#if 0
556 /* Release resources */
557 macio_release_resources(mdev);
558#endif
559
560 /* Get rid of me */
561 kfree(rm);
562
563 return 0;
564}
565
566static int rackmeter_shutdown(struct macio_dev* mdev)
567{
568 struct rackmeter *rm = dev_get_drvdata(&mdev->ofdev.dev);
569
570 if (rm == NULL)
571 return -ENODEV;
572
573 /* Stop CPU sniffer timer & work queues */
574 rackmeter_stop_cpu_sniffer(rm);
575
576 /* Stop/reset dbdma */
577 DBDMA_DO_RESET(rm->dma_regs);
578
579 return 0;
580}
581
582static struct of_device_id rackmeter_match[] = {
583 { .name = "i2s" },
584 { }
585};
Luis de Bethencourt6735b2e2015-10-20 16:13:53 +0100586MODULE_DEVICE_TABLE(of, rackmeter_match);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100587
Al Viro31421a62008-11-22 17:35:24 +0000588static struct macio_driver rackmeter_driver = {
Benjamin Herrenschmidtc2cdf6a2010-06-02 17:09:18 +1000589 .driver = {
590 .name = "rackmeter",
591 .owner = THIS_MODULE,
592 .of_match_table = rackmeter_match,
593 },
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100594 .probe = rackmeter_probe,
Greg Kroah-Hartman1da42fb2012-12-21 15:03:50 -0800595 .remove = rackmeter_remove,
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100596 .shutdown = rackmeter_shutdown,
597};
598
599
600static int __init rackmeter_init(void)
601{
602 pr_debug("rackmeter_init()\n");
603
Al Viro31421a62008-11-22 17:35:24 +0000604 return macio_register_driver(&rackmeter_driver);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100605}
606
607static void __exit rackmeter_exit(void)
608{
609 pr_debug("rackmeter_exit()\n");
610
Al Viro31421a62008-11-22 17:35:24 +0000611 macio_unregister_driver(&rackmeter_driver);
Benjamin Herrenschmidt3e00a5a2006-11-16 14:03:33 +1100612}
613
614module_init(rackmeter_init);
615module_exit(rackmeter_exit);
616
617
618MODULE_LICENSE("GPL");
619MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
620MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel");