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2c162f9b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3e00a5ae BH |
2 | /* |
3 | * RackMac vu-meter driver | |
4 | * | |
5 | * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp. | |
6 | * <benh@kernel.crashing.org> | |
7 | * | |
3e00a5ae BH |
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 :-) | |
3e00a5ae BH |
14 | */ |
15 | #undef DEBUG | |
16 | ||
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
3e00a5ae BH |
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> | |
5af50730 RH |
26 | #include <linux/of_address.h> |
27 | #include <linux/of_irq.h> | |
3e00a5ae BH |
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; | |
564b733c FW |
53 | u64 prev_wall; |
54 | u64 prev_idle; | |
3e00a5ae BH |
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 | */ | |
564b733c | 82 | static inline u64 get_cpu_idle_time(unsigned int cpu) |
3e00a5ae | 83 | { |
8392853e | 84 | struct kernel_cpustat *kcpustat = &kcpustat_cpu(cpu); |
3292beb3 | 85 | u64 retval; |
3e00a5ae | 86 | |
8392853e FW |
87 | retval = kcpustat->cpustat[CPUTIME_IDLE] + |
88 | kcpustat->cpustat[CPUTIME_IOWAIT]; | |
3e00a5ae BH |
89 | |
90 | if (rackmeter_ignore_nice) | |
8392853e | 91 | retval += kcpustat_field(kcpustat, CPUTIME_NICE, cpu); |
3e00a5ae | 92 | |
564b733c | 93 | return retval; |
3e00a5ae BH |
94 | } |
95 | ||
96 | static void rackmeter_setup_i2s(struct rackmeter *rm) | |
97 | { | |
98 | struct macio_chip *macio = rm->mdev->bus->chip; | |
99 | ||
100 | /* First whack magic GPIO */ | |
101 | pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, RACKMETER_MAGIC_GPIO, 5); | |
102 | ||
103 | ||
104 | /* Call feature code to enable the sound channel and the proper | |
105 | * clock sources | |
106 | */ | |
107 | pmac_call_feature(PMAC_FTR_SOUND_CHIP_ENABLE, rm->i2s, 0, 1); | |
108 | ||
109 | /* Power i2s and stop i2s clock. We whack MacIO FCRs directly for now. | |
110 | * This is a bit racy, thus we should add new platform functions to | |
111 | * handle that. snd-aoa needs that too | |
112 | */ | |
113 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE); | |
114 | MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT); | |
115 | (void)MACIO_IN32(KEYLARGO_FCR1); | |
116 | udelay(10); | |
117 | ||
118 | /* Then setup i2s. For now, we use the same magic value that | |
119 | * the OS X driver seems to use. We might want to play around | |
120 | * with the clock divisors later | |
121 | */ | |
122 | out_le32(rm->i2s_regs + 0x10, 0x01fa0000); | |
123 | (void)in_le32(rm->i2s_regs + 0x10); | |
124 | udelay(10); | |
125 | ||
126 | /* Fully restart i2s*/ | |
127 | MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE | | |
128 | KL1_I2S0_CLK_ENABLE_BIT); | |
129 | (void)MACIO_IN32(KEYLARGO_FCR1); | |
130 | udelay(10); | |
131 | } | |
132 | ||
133 | static void rackmeter_set_default_pattern(struct rackmeter *rm) | |
134 | { | |
135 | int i; | |
136 | ||
137 | for (i = 0; i < 16; i++) { | |
138 | if (i < 8) | |
139 | rm->ubuf[i] = (i & 1) * 255; | |
140 | else | |
141 | rm->ubuf[i] = ((~i) & 1) * 255; | |
142 | } | |
143 | } | |
144 | ||
145 | static void rackmeter_do_pause(struct rackmeter *rm, int pause) | |
146 | { | |
147 | struct rackmeter_dma *rdma = rm->dma_buf_v; | |
148 | ||
149 | pr_debug("rackmeter: %s\n", pause ? "paused" : "started"); | |
150 | ||
151 | rm->paused = pause; | |
152 | if (pause) { | |
153 | DBDMA_DO_STOP(rm->dma_regs); | |
154 | return; | |
155 | } | |
e283655b AK |
156 | memset(rdma->buf1, 0, sizeof(rdma->buf1)); |
157 | memset(rdma->buf2, 0, sizeof(rdma->buf2)); | |
3e00a5ae BH |
158 | |
159 | rm->dma_buf_v->mark = 0; | |
160 | ||
161 | mb(); | |
162 | out_le32(&rm->dma_regs->cmdptr_hi, 0); | |
163 | out_le32(&rm->dma_regs->cmdptr, rm->dma_buf_p); | |
164 | out_le32(&rm->dma_regs->control, (RUN << 16) | RUN); | |
165 | } | |
166 | ||
167 | static void rackmeter_setup_dbdma(struct rackmeter *rm) | |
168 | { | |
169 | struct rackmeter_dma *db = rm->dma_buf_v; | |
170 | struct dbdma_cmd *cmd = db->cmd; | |
171 | ||
172 | /* Make sure dbdma is reset */ | |
173 | DBDMA_DO_RESET(rm->dma_regs); | |
174 | ||
193d0732 | 175 | pr_debug("rackmeter: mark offset=0x%zx\n", |
3e00a5ae | 176 | offsetof(struct rackmeter_dma, mark)); |
193d0732 | 177 | pr_debug("rackmeter: buf1 offset=0x%zx\n", |
3e00a5ae | 178 | offsetof(struct rackmeter_dma, buf1)); |
193d0732 | 179 | pr_debug("rackmeter: buf2 offset=0x%zx\n", |
3e00a5ae BH |
180 | offsetof(struct rackmeter_dma, buf2)); |
181 | ||
182 | /* Prepare 4 dbdma commands for the 2 buffers */ | |
183 | memset(cmd, 0, 4 * sizeof(struct dbdma_cmd)); | |
f5718726 DG |
184 | cmd->req_count = cpu_to_le16(4); |
185 | cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
186 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + | |
3e00a5ae | 187 | offsetof(struct rackmeter_dma, mark)); |
f5718726 | 188 | cmd->cmd_dep = cpu_to_le32(0x02000000); |
3e00a5ae BH |
189 | cmd++; |
190 | ||
f5718726 DG |
191 | cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4); |
192 | cmd->command = cpu_to_le16(OUTPUT_MORE); | |
193 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + | |
3e00a5ae BH |
194 | offsetof(struct rackmeter_dma, buf1)); |
195 | cmd++; | |
196 | ||
f5718726 DG |
197 | cmd->req_count = cpu_to_le16(4); |
198 | cmd->command = cpu_to_le16(STORE_WORD | INTR_ALWAYS | KEY_SYSTEM); | |
199 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + | |
3e00a5ae | 200 | offsetof(struct rackmeter_dma, mark)); |
f5718726 | 201 | cmd->cmd_dep = cpu_to_le32(0x01000000); |
3e00a5ae BH |
202 | cmd++; |
203 | ||
f5718726 DG |
204 | cmd->req_count = cpu_to_le16(SAMPLE_COUNT * 4); |
205 | cmd->command = cpu_to_le16(OUTPUT_MORE | BR_ALWAYS); | |
206 | cmd->phy_addr = cpu_to_le32(rm->dma_buf_p + | |
3e00a5ae | 207 | offsetof(struct rackmeter_dma, buf2)); |
f5718726 | 208 | cmd->cmd_dep = cpu_to_le32(rm->dma_buf_p); |
3e00a5ae BH |
209 | |
210 | rackmeter_do_pause(rm, 0); | |
211 | } | |
212 | ||
6d5aefb8 | 213 | static void rackmeter_do_timer(struct work_struct *work) |
3e00a5ae | 214 | { |
6d5aefb8 DH |
215 | struct rackmeter_cpu *rcpu = |
216 | container_of(work, struct rackmeter_cpu, sniffer.work); | |
217 | struct rackmeter *rm = rcpu->rm; | |
3e00a5ae | 218 | unsigned int cpu = smp_processor_id(); |
564b733c FW |
219 | u64 cur_nsecs, total_idle_nsecs; |
220 | u64 total_nsecs, idle_nsecs; | |
3e00a5ae BH |
221 | int i, offset, load, cumm, pause; |
222 | ||
564b733c FW |
223 | cur_nsecs = jiffies64_to_nsecs(get_jiffies_64()); |
224 | total_nsecs = cur_nsecs - rcpu->prev_wall; | |
225 | rcpu->prev_wall = cur_nsecs; | |
3e00a5ae | 226 | |
564b733c FW |
227 | total_idle_nsecs = get_cpu_idle_time(cpu); |
228 | idle_nsecs = total_idle_nsecs - rcpu->prev_idle; | |
229 | idle_nsecs = min(idle_nsecs, total_nsecs); | |
230 | rcpu->prev_idle = total_idle_nsecs; | |
3e00a5ae BH |
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 | */ | |
564b733c | 235 | load = div64_u64(9 * (total_nsecs - idle_nsecs), total_nsecs); |
3e00a5ae BH |
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 | 279 | rcpu->prev_idle = get_cpu_idle_time(cpu); |
564b733c | 280 | rcpu->prev_wall = jiffies64_to_nsecs(get_jiffies_64()); |
3e00a5ae BH |
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 */ | |
f1e0addc RH |
378 | for_each_child_of_node(mdev->ofdev.dev.of_node, i2s) |
379 | if (of_node_name_eq(i2s, "i2s-a")) | |
380 | break; | |
381 | ||
3e00a5ae BH |
382 | if (i2s == NULL) { |
383 | pr_debug(" i2s-a child not found\n"); | |
384 | goto bail; | |
385 | } | |
386 | /* Get lightshow or virtual sound */ | |
f1e0addc RH |
387 | for_each_child_of_node(i2s, np) { |
388 | if (of_node_name_eq(np, "lightshow")) | |
3e00a5ae | 389 | break; |
f1e0addc | 390 | if (of_node_name_eq(np, "sound") && |
01b2726d | 391 | of_get_property(np, "virtual", NULL) != NULL) |
3e00a5ae BH |
392 | 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 */ | |
a0828cf5 | 400 | rm = kzalloc(sizeof(*rm), GFP_KERNEL); |
3e00a5ae BH |
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 | |
b6a945ae | 414 | "rackmeter: found match but lacks resources: %pOF" |
3e00a5ae | 415 | " (%d resources, %d interrupts)\n", |
b6a945ae | 416 | mdev->ofdev.dev.of_node); |
3e00a5ae BH |
417 | rc = -ENXIO; |
418 | goto bail_free; | |
419 | } | |
420 | if (macio_request_resources(mdev, "rackmeter")) { | |
421 | printk(KERN_ERR | |
b6a945ae RH |
422 | "rackmeter: failed to request resources: %pOF\n", |
423 | mdev->ofdev.dev.of_node); | |
3e00a5ae BH |
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); | |
ef24ba70 | 430 | if (!rm->irq || |
3e00a5ae BH |
431 | of_address_to_resource(i2s, 0, &ri2s) || |
432 | of_address_to_resource(i2s, 1, &rdma)) { | |
433 | printk(KERN_ERR | |
b6a945ae RH |
434 | "rackmeter: found match but lacks resources: %pOF", |
435 | mdev->ofdev.dev.of_node); | |
3e00a5ae BH |
436 | 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 | ||
1da42fb6 | 527 | static int rackmeter_remove(struct macio_dev* mdev) |
3e00a5ae BH |
528 | { |
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 | ||
566 | static 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 | ||
516fa8d0 | 582 | static const struct of_device_id rackmeter_match[] = { |
3e00a5ae BH |
583 | { .name = "i2s" }, |
584 | { } | |
585 | }; | |
6735b2e9 | 586 | MODULE_DEVICE_TABLE(of, rackmeter_match); |
3e00a5ae | 587 | |
31421a6f | 588 | static struct macio_driver rackmeter_driver = { |
c2cdf6ab BH |
589 | .driver = { |
590 | .name = "rackmeter", | |
591 | .owner = THIS_MODULE, | |
592 | .of_match_table = rackmeter_match, | |
593 | }, | |
3e00a5ae | 594 | .probe = rackmeter_probe, |
1da42fb6 | 595 | .remove = rackmeter_remove, |
3e00a5ae BH |
596 | .shutdown = rackmeter_shutdown, |
597 | }; | |
598 | ||
599 | ||
600 | static int __init rackmeter_init(void) | |
601 | { | |
602 | pr_debug("rackmeter_init()\n"); | |
603 | ||
31421a6f | 604 | return macio_register_driver(&rackmeter_driver); |
3e00a5ae BH |
605 | } |
606 | ||
607 | static void __exit rackmeter_exit(void) | |
608 | { | |
609 | pr_debug("rackmeter_exit()\n"); | |
610 | ||
31421a6f | 611 | macio_unregister_driver(&rackmeter_driver); |
3e00a5ae BH |
612 | } |
613 | ||
614 | module_init(rackmeter_init); | |
615 | module_exit(rackmeter_exit); | |
616 | ||
617 | ||
618 | MODULE_LICENSE("GPL"); | |
619 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
620 | MODULE_DESCRIPTION("RackMeter: Support vu-meter on XServe front panel"); |