2 * dim2_hdm.c - MediaLB DIM2 Hardware Dependent Module
4 * Copyright (C) 2015-2016, Microchip Technology Germany II GmbH & Co. KG
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
11 * This file is licensed under GPLv2.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/module.h>
17 #include <linux/printk.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/platform_device.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/sched.h>
26 #include <linux/kthread.h>
29 #include <networking.h>
32 #include "dim2_errors.h"
33 #include "dim2_sysfs.h"
35 #define DMA_CHANNELS (32 - 1) /* channel 0 is a system channel */
37 #define MAX_BUFFERS_PACKET 32
38 #define MAX_BUFFERS_STREAMING 32
39 #define MAX_BUF_SIZE_PACKET 2048
40 #define MAX_BUF_SIZE_STREAMING (8 * 1024)
42 /* command line parameter to select clock speed */
43 static char *clock_speed;
44 module_param(clock_speed, charp, 0);
45 MODULE_PARM_DESC(clock_speed, "MediaLB Clock Speed");
48 * The parameter representing the number of frames per sub-buffer for
49 * synchronous channels. Valid values: [0 .. 6].
51 * The values 0, 1, 2, 3, 4, 5, 6 represent corresponding number of frames per
52 * sub-buffer 1, 2, 4, 8, 16, 32, 64.
54 static u8 fcnt = 4; /* (1 << fcnt) frames per subbuffer */
55 module_param(fcnt, byte, 0);
56 MODULE_PARM_DESC(fcnt, "Num of frames per sub-buffer for sync channels as a power of 2");
58 static DEFINE_SPINLOCK(dim_lock);
60 static void dim2_tasklet_fn(unsigned long data);
61 static DECLARE_TASKLET(dim2_tasklet, dim2_tasklet_fn, 0);
64 * struct hdm_channel - private structure to keep channel specific data
65 * @is_initialized: identifier to know whether the channel is initialized
66 * @ch: HAL specific channel data
67 * @pending_list: list to keep MBO's before starting transfer
68 * @started_list: list to keep MBO's after starting transfer
69 * @direction: channel direction (TX or RX)
70 * @data_type: channel data type
73 char name[sizeof "caNNN"];
75 struct dim_channel ch;
76 struct list_head pending_list; /* before dim_enqueue_buffer() */
77 struct list_head started_list; /* after dim_enqueue_buffer() */
78 enum most_channel_direction direction;
79 enum most_channel_data_type data_type;
83 * struct dim2_hdm - private structure to keep interface specific data
84 * @hch: an array of channel specific data
85 * @most_iface: most interface structure
86 * @capabilities: an array of channel capability data
87 * @io_base: I/O register base address
88 * @clk_speed: user selectable (through command line parameter) clock speed
89 * @netinfo_task: thread to deliver network status
90 * @netinfo_waitq: waitq for the thread to sleep
91 * @deliver_netinfo: to identify whether network status received
92 * @mac_addrs: INIC mac address
93 * @link_state: network link state
94 * @atx_idx: index of async tx channel
97 struct hdm_channel hch[DMA_CHANNELS];
98 struct most_channel_capability capabilities[DMA_CHANNELS];
99 struct most_interface most_iface;
100 char name[16 + sizeof "dim2-"];
101 void __iomem *io_base;
103 struct task_struct *netinfo_task;
104 wait_queue_head_t netinfo_waitq;
106 unsigned char mac_addrs[6];
107 unsigned char link_state;
109 struct medialb_bus bus;
112 #define iface_to_hdm(iface) container_of(iface, struct dim2_hdm, most_iface)
114 /* Macro to identify a network status message */
115 #define PACKET_IS_NET_INFO(p) \
116 (((p)[1] == 0x18) && ((p)[2] == 0x05) && ((p)[3] == 0x0C) && \
117 ((p)[13] == 0x3C) && ((p)[14] == 0x00) && ((p)[15] == 0x0A))
119 bool dim2_sysfs_get_state_cb(void)
124 spin_lock_irqsave(&dim_lock, flags);
125 state = dim_get_lock_state();
126 spin_unlock_irqrestore(&dim_lock, flags);
132 * dimcb_io_read - callback from HAL to read an I/O register
133 * @ptr32: register address
135 u32 dimcb_io_read(u32 __iomem *ptr32)
141 * dimcb_io_write - callback from HAL to write value to an I/O register
142 * @ptr32: register address
143 * @value: value to write
145 void dimcb_io_write(u32 __iomem *ptr32, u32 value)
147 writel(value, ptr32);
151 * dimcb_on_error - callback from HAL to report miscommunication between
153 * @error_id: Error ID
154 * @error_message: Error message. Some text in a free format
156 void dimcb_on_error(u8 error_id, const char *error_message)
158 pr_err("dimcb_on_error: error_id - %d, error_message - %s\n", error_id,
163 * startup_dim - initialize the dim2 interface
164 * @pdev: platform device
166 * Get the value of command line parameter "clock_speed" if given or use the
167 * default value, enable the clock and PLL, and initialize the dim2 interface.
169 static int startup_dim(struct platform_device *pdev)
171 struct dim2_hdm *dev = platform_get_drvdata(pdev);
172 struct dim2_platform_data *pdata = pdev->dev.platform_data;
178 if (!strcmp(clock_speed, "256fs"))
179 dev->clk_speed = CLK_256FS;
180 else if (!strcmp(clock_speed, "512fs"))
181 dev->clk_speed = CLK_512FS;
182 else if (!strcmp(clock_speed, "1024fs"))
183 dev->clk_speed = CLK_1024FS;
184 else if (!strcmp(clock_speed, "2048fs"))
185 dev->clk_speed = CLK_2048FS;
186 else if (!strcmp(clock_speed, "3072fs"))
187 dev->clk_speed = CLK_3072FS;
188 else if (!strcmp(clock_speed, "4096fs"))
189 dev->clk_speed = CLK_4096FS;
190 else if (!strcmp(clock_speed, "6144fs"))
191 dev->clk_speed = CLK_6144FS;
192 else if (!strcmp(clock_speed, "8192fs"))
193 dev->clk_speed = CLK_8192FS;
196 if (dev->clk_speed == -1) {
197 pr_info("Bad or missing clock speed parameter, using default value: 3072fs\n");
198 dev->clk_speed = CLK_3072FS;
200 pr_info("Selected clock speed: %s\n", clock_speed);
202 if (pdata && pdata->init) {
203 int ret = pdata->init(pdata, dev->io_base, dev->clk_speed);
209 pr_info("sync: num of frames per sub-buffer: %u\n", fcnt);
210 hal_ret = dim_startup(dev->io_base, dev->clk_speed, fcnt);
211 if (hal_ret != DIM_NO_ERROR) {
212 pr_err("dim_startup failed: %d\n", hal_ret);
213 if (pdata && pdata->destroy)
214 pdata->destroy(pdata);
222 * try_start_dim_transfer - try to transfer a buffer on a channel
223 * @hdm_ch: channel specific data
225 * Transfer a buffer from pending_list if the channel is ready
227 static int try_start_dim_transfer(struct hdm_channel *hdm_ch)
230 struct list_head *head = &hdm_ch->pending_list;
233 struct dim_ch_state_t st;
236 BUG_ON(!hdm_ch->is_initialized);
238 spin_lock_irqsave(&dim_lock, flags);
239 if (list_empty(head)) {
240 spin_unlock_irqrestore(&dim_lock, flags);
244 if (!dim_get_channel_state(&hdm_ch->ch, &st)->ready) {
245 spin_unlock_irqrestore(&dim_lock, flags);
249 mbo = list_first_entry(head, struct mbo, list);
250 buf_size = mbo->buffer_length;
252 if (dim_dbr_space(&hdm_ch->ch) < buf_size) {
253 spin_unlock_irqrestore(&dim_lock, flags);
257 BUG_ON(mbo->bus_address == 0);
258 if (!dim_enqueue_buffer(&hdm_ch->ch, mbo->bus_address, buf_size)) {
259 list_del(head->next);
260 spin_unlock_irqrestore(&dim_lock, flags);
261 mbo->processed_length = 0;
262 mbo->status = MBO_E_INVAL;
267 list_move_tail(head->next, &hdm_ch->started_list);
268 spin_unlock_irqrestore(&dim_lock, flags);
274 * deliver_netinfo_thread - thread to deliver network status to mostcore
275 * @data: private data
277 * Wait for network status and deliver it to mostcore once it is received
279 static int deliver_netinfo_thread(void *data)
281 struct dim2_hdm *dev = data;
283 while (!kthread_should_stop()) {
284 wait_event_interruptible(dev->netinfo_waitq,
285 dev->deliver_netinfo ||
286 kthread_should_stop());
288 if (dev->deliver_netinfo) {
289 dev->deliver_netinfo--;
290 most_deliver_netinfo(&dev->most_iface, dev->link_state,
299 * retrieve_netinfo - retrieve network status from received buffer
303 * Parse the message in buffer and get node address, link state, MAC address.
304 * Wake up a thread to deliver this status to mostcore
306 static void retrieve_netinfo(struct dim2_hdm *dev, struct mbo *mbo)
308 u8 *data = mbo->virt_address;
309 u8 *mac = dev->mac_addrs;
311 pr_info("Node Address: 0x%03x\n", (u16)data[16] << 8 | data[17]);
312 dev->link_state = data[18];
313 pr_info("NIState: %d\n", dev->link_state);
314 memcpy(mac, data + 19, 6);
315 pr_info("MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",
316 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
317 dev->deliver_netinfo++;
318 wake_up_interruptible(&dev->netinfo_waitq);
322 * service_done_flag - handle completed buffers
324 * @ch_idx: channel index
326 * Return back the completed buffers to mostcore, using completion callback
328 static void service_done_flag(struct dim2_hdm *dev, int ch_idx)
330 struct hdm_channel *hdm_ch = dev->hch + ch_idx;
331 struct dim_ch_state_t st;
332 struct list_head *head;
339 BUG_ON(!hdm_ch->is_initialized);
341 spin_lock_irqsave(&dim_lock, flags);
343 done_buffers = dim_get_channel_state(&hdm_ch->ch, &st)->done_buffers;
345 spin_unlock_irqrestore(&dim_lock, flags);
349 if (!dim_detach_buffers(&hdm_ch->ch, done_buffers)) {
350 spin_unlock_irqrestore(&dim_lock, flags);
353 spin_unlock_irqrestore(&dim_lock, flags);
355 head = &hdm_ch->started_list;
357 while (done_buffers) {
358 spin_lock_irqsave(&dim_lock, flags);
359 if (list_empty(head)) {
360 spin_unlock_irqrestore(&dim_lock, flags);
361 pr_crit("hard error: started_mbo list is empty whereas DIM2 has sent buffers\n");
365 mbo = list_first_entry(head, struct mbo, list);
366 list_del(head->next);
367 spin_unlock_irqrestore(&dim_lock, flags);
369 data = mbo->virt_address;
371 if (hdm_ch->data_type == MOST_CH_ASYNC &&
372 hdm_ch->direction == MOST_CH_RX &&
373 PACKET_IS_NET_INFO(data)) {
374 retrieve_netinfo(dev, mbo);
376 spin_lock_irqsave(&dim_lock, flags);
377 list_add_tail(&mbo->list, &hdm_ch->pending_list);
378 spin_unlock_irqrestore(&dim_lock, flags);
380 if (hdm_ch->data_type == MOST_CH_CONTROL ||
381 hdm_ch->data_type == MOST_CH_ASYNC) {
382 u32 const data_size =
383 (u32)data[0] * 256 + data[1] + 2;
385 mbo->processed_length =
386 min_t(u32, data_size,
389 mbo->processed_length = mbo->buffer_length;
391 mbo->status = MBO_SUCCESS;
399 static struct dim_channel **get_active_channels(struct dim2_hdm *dev,
400 struct dim_channel **buffer)
405 for (ch_idx = 0; ch_idx < DMA_CHANNELS; ch_idx++) {
406 if (dev->hch[ch_idx].is_initialized)
407 buffer[idx++] = &dev->hch[ch_idx].ch;
409 buffer[idx++] = NULL;
414 static irqreturn_t dim2_mlb_isr(int irq, void *_dev)
416 struct dim2_hdm *dev = _dev;
419 spin_lock_irqsave(&dim_lock, flags);
420 dim_service_mlb_int_irq();
421 spin_unlock_irqrestore(&dim_lock, flags);
423 if (dev->atx_idx >= 0 && dev->hch[dev->atx_idx].is_initialized)
424 while (!try_start_dim_transfer(dev->hch + dev->atx_idx))
431 * dim2_tasklet_fn - tasklet function
432 * @data: private data
434 * Service each initialized channel, if needed
436 static void dim2_tasklet_fn(unsigned long data)
438 struct dim2_hdm *dev = (struct dim2_hdm *)data;
442 for (ch_idx = 0; ch_idx < DMA_CHANNELS; ch_idx++) {
443 if (!dev->hch[ch_idx].is_initialized)
446 spin_lock_irqsave(&dim_lock, flags);
447 dim_service_channel(&dev->hch[ch_idx].ch);
448 spin_unlock_irqrestore(&dim_lock, flags);
450 service_done_flag(dev, ch_idx);
451 while (!try_start_dim_transfer(dev->hch + ch_idx))
457 * dim2_ahb_isr - interrupt service routine
459 * @_dev: private data
461 * Acknowledge the interrupt and schedule a tasklet to service channels.
462 * Return IRQ_HANDLED.
464 static irqreturn_t dim2_ahb_isr(int irq, void *_dev)
466 struct dim2_hdm *dev = _dev;
467 struct dim_channel *buffer[DMA_CHANNELS + 1];
470 spin_lock_irqsave(&dim_lock, flags);
471 dim_service_ahb_int_irq(get_active_channels(dev, buffer));
472 spin_unlock_irqrestore(&dim_lock, flags);
474 dim2_tasklet.data = (unsigned long)dev;
475 tasklet_schedule(&dim2_tasklet);
480 * complete_all_mbos - complete MBO's in a list
483 * Delete all the entries in list and return back MBO's to mostcore using
484 * completion call back.
486 static void complete_all_mbos(struct list_head *head)
492 spin_lock_irqsave(&dim_lock, flags);
493 if (list_empty(head)) {
494 spin_unlock_irqrestore(&dim_lock, flags);
498 mbo = list_first_entry(head, struct mbo, list);
499 list_del(head->next);
500 spin_unlock_irqrestore(&dim_lock, flags);
502 mbo->processed_length = 0;
503 mbo->status = MBO_E_CLOSE;
509 * configure_channel - initialize a channel
510 * @iface: interface the channel belongs to
511 * @channel: channel to be configured
512 * @channel_config: structure that holds the configuration information
514 * Receives configuration information from mostcore and initialize
515 * the corresponding channel. Return 0 on success, negative on failure.
517 static int configure_channel(struct most_interface *most_iface, int ch_idx,
518 struct most_channel_config *ccfg)
520 struct dim2_hdm *dev = iface_to_hdm(most_iface);
521 bool const is_tx = ccfg->direction == MOST_CH_TX;
522 u16 const sub_size = ccfg->subbuffer_size;
523 u16 const buf_size = ccfg->buffer_size;
527 int const ch_addr = ch_idx * 2 + 2;
528 struct hdm_channel *const hdm_ch = dev->hch + ch_idx;
530 BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
532 if (hdm_ch->is_initialized)
535 switch (ccfg->data_type) {
536 case MOST_CH_CONTROL:
537 new_size = dim_norm_ctrl_async_buffer_size(buf_size);
539 pr_err("%s: too small buffer size\n", hdm_ch->name);
542 ccfg->buffer_size = new_size;
543 if (new_size != buf_size)
544 pr_warn("%s: fixed buffer size (%d -> %d)\n",
545 hdm_ch->name, buf_size, new_size);
546 spin_lock_irqsave(&dim_lock, flags);
547 hal_ret = dim_init_control(&hdm_ch->ch, is_tx, ch_addr,
548 is_tx ? new_size * 2 : new_size);
551 new_size = dim_norm_ctrl_async_buffer_size(buf_size);
553 pr_err("%s: too small buffer size\n", hdm_ch->name);
556 ccfg->buffer_size = new_size;
557 if (new_size != buf_size)
558 pr_warn("%s: fixed buffer size (%d -> %d)\n",
559 hdm_ch->name, buf_size, new_size);
560 spin_lock_irqsave(&dim_lock, flags);
561 hal_ret = dim_init_async(&hdm_ch->ch, is_tx, ch_addr,
562 is_tx ? new_size * 2 : new_size);
565 new_size = dim_norm_isoc_buffer_size(buf_size, sub_size);
567 pr_err("%s: invalid sub-buffer size or too small buffer size\n",
571 ccfg->buffer_size = new_size;
572 if (new_size != buf_size)
573 pr_warn("%s: fixed buffer size (%d -> %d)\n",
574 hdm_ch->name, buf_size, new_size);
575 spin_lock_irqsave(&dim_lock, flags);
576 hal_ret = dim_init_isoc(&hdm_ch->ch, is_tx, ch_addr, sub_size);
579 new_size = dim_norm_sync_buffer_size(buf_size, sub_size);
581 pr_err("%s: invalid sub-buffer size or too small buffer size\n",
585 ccfg->buffer_size = new_size;
586 if (new_size != buf_size)
587 pr_warn("%s: fixed buffer size (%d -> %d)\n",
588 hdm_ch->name, buf_size, new_size);
589 spin_lock_irqsave(&dim_lock, flags);
590 hal_ret = dim_init_sync(&hdm_ch->ch, is_tx, ch_addr, sub_size);
593 pr_err("%s: configure failed, bad channel type: %d\n",
594 hdm_ch->name, ccfg->data_type);
598 if (hal_ret != DIM_NO_ERROR) {
599 spin_unlock_irqrestore(&dim_lock, flags);
600 pr_err("%s: configure failed (%d), type: %d, is_tx: %d\n",
601 hdm_ch->name, hal_ret, ccfg->data_type, (int)is_tx);
605 hdm_ch->data_type = ccfg->data_type;
606 hdm_ch->direction = ccfg->direction;
607 hdm_ch->is_initialized = true;
609 if (hdm_ch->data_type == MOST_CH_ASYNC &&
610 hdm_ch->direction == MOST_CH_TX &&
612 dev->atx_idx = ch_idx;
614 spin_unlock_irqrestore(&dim_lock, flags);
620 * enqueue - enqueue a buffer for data transfer
621 * @iface: intended interface
622 * @channel: ID of the channel the buffer is intended for
623 * @mbo: pointer to the buffer object
625 * Push the buffer into pending_list and try to transfer one buffer from
626 * pending_list. Return 0 on success, negative on failure.
628 static int enqueue(struct most_interface *most_iface, int ch_idx,
631 struct dim2_hdm *dev = iface_to_hdm(most_iface);
632 struct hdm_channel *hdm_ch = dev->hch + ch_idx;
635 BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
637 if (!hdm_ch->is_initialized)
640 if (mbo->bus_address == 0)
643 spin_lock_irqsave(&dim_lock, flags);
644 list_add_tail(&mbo->list, &hdm_ch->pending_list);
645 spin_unlock_irqrestore(&dim_lock, flags);
647 (void)try_start_dim_transfer(hdm_ch);
653 * request_netinfo - triggers retrieving of network info
654 * @iface: pointer to the interface
655 * @channel_id: corresponding channel ID
657 * Send a command to INIC which triggers retrieving of network info by means of
658 * "Message exchange over MDP/MEP". Return 0 on success, negative on failure.
660 static void request_netinfo(struct most_interface *most_iface, int ch_idx)
662 struct dim2_hdm *dev = iface_to_hdm(most_iface);
666 if (dev->atx_idx < 0) {
667 pr_err("Async Tx Not initialized\n");
671 mbo = most_get_mbo(&dev->most_iface, dev->atx_idx, NULL);
675 mbo->buffer_length = 5;
677 data = mbo->virt_address;
679 data[0] = 0x00; /* PML High byte */
680 data[1] = 0x03; /* PML Low byte */
681 data[2] = 0x02; /* PMHL */
682 data[3] = 0x08; /* FPH */
683 data[4] = 0x40; /* FMF (FIFO cmd msg - Triggers NAOverMDP) */
685 most_submit_mbo(mbo);
689 * poison_channel - poison buffers of a channel
690 * @iface: pointer to the interface the channel to be poisoned belongs to
691 * @channel_id: corresponding channel ID
693 * Destroy a channel and complete all the buffers in both started_list &
694 * pending_list. Return 0 on success, negative on failure.
696 static int poison_channel(struct most_interface *most_iface, int ch_idx)
698 struct dim2_hdm *dev = iface_to_hdm(most_iface);
699 struct hdm_channel *hdm_ch = dev->hch + ch_idx;
704 BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
706 if (!hdm_ch->is_initialized)
709 tasklet_disable(&dim2_tasklet);
710 spin_lock_irqsave(&dim_lock, flags);
711 hal_ret = dim_destroy_channel(&hdm_ch->ch);
712 hdm_ch->is_initialized = false;
713 if (ch_idx == dev->atx_idx)
715 spin_unlock_irqrestore(&dim_lock, flags);
716 tasklet_enable(&dim2_tasklet);
717 if (hal_ret != DIM_NO_ERROR) {
718 pr_err("HAL Failed to close channel %s\n", hdm_ch->name);
722 complete_all_mbos(&hdm_ch->started_list);
723 complete_all_mbos(&hdm_ch->pending_list);
729 * dim2_probe - dim2 probe handler
730 * @pdev: platform device structure
732 * Register the dim2 interface with mostcore and initialize it.
733 * Return 0 on success, negative on failure.
735 static int dim2_probe(struct platform_device *pdev)
737 struct dim2_hdm *dev;
738 struct resource *res;
740 struct kobject *kobj;
743 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
749 platform_set_drvdata(pdev, dev);
750 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
751 dev->io_base = devm_ioremap_resource(&pdev->dev, res);
752 if (IS_ERR(dev->io_base))
753 return PTR_ERR(dev->io_base);
755 irq = platform_get_irq(pdev, 0);
757 dev_err(&pdev->dev, "failed to get ahb0_int irq\n");
761 ret = devm_request_irq(&pdev->dev, irq, dim2_ahb_isr, 0,
762 "dim2_ahb0_int", dev);
764 dev_err(&pdev->dev, "failed to request ahb0_int irq %d\n", irq);
768 irq = platform_get_irq(pdev, 1);
770 dev_err(&pdev->dev, "failed to get mlb_int irq\n");
774 ret = devm_request_irq(&pdev->dev, irq, dim2_mlb_isr, 0,
775 "dim2_mlb_int", dev);
777 dev_err(&pdev->dev, "failed to request mlb_int irq %d\n", irq);
781 init_waitqueue_head(&dev->netinfo_waitq);
782 dev->deliver_netinfo = 0;
783 dev->netinfo_task = kthread_run(&deliver_netinfo_thread, (void *)dev,
785 if (IS_ERR(dev->netinfo_task))
786 return PTR_ERR(dev->netinfo_task);
788 for (i = 0; i < DMA_CHANNELS; i++) {
789 struct most_channel_capability *cap = dev->capabilities + i;
790 struct hdm_channel *hdm_ch = dev->hch + i;
792 INIT_LIST_HEAD(&hdm_ch->pending_list);
793 INIT_LIST_HEAD(&hdm_ch->started_list);
794 hdm_ch->is_initialized = false;
795 snprintf(hdm_ch->name, sizeof(hdm_ch->name), "ca%d", i * 2 + 2);
797 cap->name_suffix = hdm_ch->name;
798 cap->direction = MOST_CH_RX | MOST_CH_TX;
799 cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
800 MOST_CH_ISOC | MOST_CH_SYNC;
801 cap->num_buffers_packet = MAX_BUFFERS_PACKET;
802 cap->buffer_size_packet = MAX_BUF_SIZE_PACKET;
803 cap->num_buffers_streaming = MAX_BUFFERS_STREAMING;
804 cap->buffer_size_streaming = MAX_BUF_SIZE_STREAMING;
810 if (sizeof(res->start) == sizeof(long long))
811 fmt = "dim2-%016llx";
812 else if (sizeof(res->start) == sizeof(long))
817 snprintf(dev->name, sizeof(dev->name), fmt, res->start);
820 dev->most_iface.interface = ITYPE_MEDIALB_DIM2;
821 dev->most_iface.description = dev->name;
822 dev->most_iface.num_channels = DMA_CHANNELS;
823 dev->most_iface.channel_vector = dev->capabilities;
824 dev->most_iface.configure = configure_channel;
825 dev->most_iface.enqueue = enqueue;
826 dev->most_iface.poison_channel = poison_channel;
827 dev->most_iface.request_netinfo = request_netinfo;
829 kobj = most_register_interface(&dev->most_iface);
832 dev_err(&pdev->dev, "failed to register MOST interface\n");
833 goto err_stop_thread;
836 ret = dim2_sysfs_probe(&dev->bus, kobj);
838 goto err_unreg_iface;
840 ret = startup_dim(pdev);
842 dev_err(&pdev->dev, "failed to initialize DIM2\n");
843 goto err_destroy_bus;
849 dim2_sysfs_destroy(&dev->bus);
851 most_deregister_interface(&dev->most_iface);
853 kthread_stop(dev->netinfo_task);
859 * dim2_remove - dim2 remove handler
860 * @pdev: platform device structure
862 * Unregister the interface from mostcore
864 static int dim2_remove(struct platform_device *pdev)
866 struct dim2_hdm *dev = platform_get_drvdata(pdev);
867 struct dim2_platform_data *pdata = pdev->dev.platform_data;
870 spin_lock_irqsave(&dim_lock, flags);
872 spin_unlock_irqrestore(&dim_lock, flags);
874 if (pdata && pdata->destroy)
875 pdata->destroy(pdata);
877 dim2_sysfs_destroy(&dev->bus);
878 most_deregister_interface(&dev->most_iface);
879 kthread_stop(dev->netinfo_task);
882 * break link to local platform_device_id struct
883 * to prevent crash by unload platform device module
885 pdev->id_entry = NULL;
890 static struct platform_device_id dim2_id[] = {
892 { }, /* Terminating entry */
895 MODULE_DEVICE_TABLE(platform, dim2_id);
897 static struct platform_driver dim2_driver = {
899 .remove = dim2_remove,
906 module_platform_driver(dim2_driver);
908 MODULE_AUTHOR("Jain Roy Ambi <JainRoy.Ambi@microchip.com>");
909 MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
910 MODULE_DESCRIPTION("MediaLB DIM2 Hardware Dependent Module");
911 MODULE_LICENSE("GPL");