2 * dim2_hdm.c - MediaLB DIM2 Hardware Dependent Module
4 * Copyright (C) 2015, 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 * #############################################################################
50 * The define below activates an utility function used by HAL-simu
51 * for calling DIM interrupt handler.
52 * It is used only for TEST PURPOSE and shall be commented before release.
54 * #############################################################################
56 /* #define ENABLE_HDM_TEST */
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 * @irq_ahb0: dim2 AHB0 irq number
89 * @clk_speed: user selectable (through command line parameter) clock speed
90 * @netinfo_task: thread to deliver network status
91 * @netinfo_waitq: waitq for the thread to sleep
92 * @deliver_netinfo: to identify whether network status received
93 * @mac_addrs: INIC mac address
94 * @link_state: network link state
95 * @atx_idx: index of async tx channel
98 struct hdm_channel hch[DMA_CHANNELS];
99 struct most_channel_capability capabilities[DMA_CHANNELS];
100 struct most_interface most_iface;
101 char name[16 + sizeof "dim2-"];
103 unsigned int irq_ahb0;
105 struct task_struct *netinfo_task;
106 wait_queue_head_t netinfo_waitq;
108 unsigned char mac_addrs[6];
109 unsigned char link_state;
111 struct medialb_bus bus;
114 #define iface_to_hdm(iface) container_of(iface, struct dim2_hdm, most_iface)
116 /* Macro to identify a network status message */
117 #define PACKET_IS_NET_INFO(p) \
118 (((p)[1] == 0x18) && ((p)[2] == 0x05) && ((p)[3] == 0x0C) && \
119 ((p)[13] == 0x3C) && ((p)[14] == 0x00) && ((p)[15] == 0x0A))
121 #if defined(ENABLE_HDM_TEST)
122 static struct dim2_hdm *test_dev;
125 bool dim2_sysfs_get_state_cb(void)
130 spin_lock_irqsave(&dim_lock, flags);
131 state = dim_get_lock_state();
132 spin_unlock_irqrestore(&dim_lock, flags);
138 * dimcb_io_read - callback from HAL to read an I/O register
139 * @ptr32: register address
141 u32 dimcb_io_read(u32 *ptr32)
147 * dimcb_io_write - callback from HAL to write value to an I/O register
148 * @ptr32: register address
149 * @value: value to write
151 void dimcb_io_write(u32 *ptr32, u32 value)
153 writel(value, ptr32);
157 * dimcb_on_error - callback from HAL to report miscommunication between
159 * @error_id: Error ID
160 * @error_message: Error message. Some text in a free format
162 void dimcb_on_error(u8 error_id, const char *error_message)
164 pr_err("dimcb_on_error: error_id - %d, error_message - %s\n", error_id,
169 * startup_dim - initialize the dim2 interface
170 * @pdev: platform device
172 * Get the value of command line parameter "clock_speed" if given or use the
173 * default value, enable the clock and PLL, and initialize the dim2 interface.
175 static int startup_dim(struct platform_device *pdev)
177 struct dim2_hdm *dev = platform_get_drvdata(pdev);
178 struct dim2_platform_data *pdata = pdev->dev.platform_data;
184 if (!strcmp(clock_speed, "256fs"))
185 dev->clk_speed = CLK_256FS;
186 else if (!strcmp(clock_speed, "512fs"))
187 dev->clk_speed = CLK_512FS;
188 else if (!strcmp(clock_speed, "1024fs"))
189 dev->clk_speed = CLK_1024FS;
190 else if (!strcmp(clock_speed, "2048fs"))
191 dev->clk_speed = CLK_2048FS;
192 else if (!strcmp(clock_speed, "3072fs"))
193 dev->clk_speed = CLK_3072FS;
194 else if (!strcmp(clock_speed, "4096fs"))
195 dev->clk_speed = CLK_4096FS;
196 else if (!strcmp(clock_speed, "6144fs"))
197 dev->clk_speed = CLK_6144FS;
198 else if (!strcmp(clock_speed, "8192fs"))
199 dev->clk_speed = CLK_8192FS;
202 if (dev->clk_speed == -1) {
203 pr_info("Bad or missing clock speed parameter, using default value: 3072fs\n");
204 dev->clk_speed = CLK_3072FS;
206 pr_info("Selected clock speed: %s\n", clock_speed);
208 if (pdata && pdata->init) {
209 int ret = pdata->init(pdata, dev->io_base, dev->clk_speed);
215 hal_ret = dim_startup(dev->io_base, dev->clk_speed);
216 if (hal_ret != DIM_NO_ERROR) {
217 pr_err("dim_startup failed: %d\n", hal_ret);
218 if (pdata && pdata->destroy)
219 pdata->destroy(pdata);
227 * try_start_dim_transfer - try to transfer a buffer on a channel
228 * @hdm_ch: channel specific data
230 * Transfer a buffer from pending_list if the channel is ready
232 static int try_start_dim_transfer(struct hdm_channel *hdm_ch)
235 struct list_head *head = &hdm_ch->pending_list;
238 struct dim_ch_state_t st;
241 BUG_ON(!hdm_ch->is_initialized);
243 spin_lock_irqsave(&dim_lock, flags);
244 if (list_empty(head)) {
245 spin_unlock_irqrestore(&dim_lock, flags);
249 if (!dim_get_channel_state(&hdm_ch->ch, &st)->ready) {
250 spin_unlock_irqrestore(&dim_lock, flags);
254 mbo = list_entry(head->next, struct mbo, list);
255 buf_size = mbo->buffer_length;
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_entry(head->next, 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;
415 * dim2_tasklet_fn - tasklet function
416 * @data: private data
418 * Service each initialized channel, if needed
420 static void dim2_tasklet_fn(unsigned long data)
422 struct dim2_hdm *dev = (struct dim2_hdm *)data;
426 for (ch_idx = 0; ch_idx < DMA_CHANNELS; ch_idx++) {
427 if (!dev->hch[ch_idx].is_initialized)
430 spin_lock_irqsave(&dim_lock, flags);
431 dim_service_channel(&dev->hch[ch_idx].ch);
432 spin_unlock_irqrestore(&dim_lock, flags);
434 service_done_flag(dev, ch_idx);
435 while (!try_start_dim_transfer(dev->hch + ch_idx))
441 * dim2_ahb_isr - interrupt service routine
443 * @_dev: private data
445 * Acknowledge the interrupt and schedule a tasklet to service channels.
446 * Return IRQ_HANDLED.
448 static irqreturn_t dim2_ahb_isr(int irq, void *_dev)
450 struct dim2_hdm *dev = _dev;
451 struct dim_channel *buffer[DMA_CHANNELS + 1];
454 spin_lock_irqsave(&dim_lock, flags);
455 dim_service_irq(get_active_channels(dev, buffer));
456 spin_unlock_irqrestore(&dim_lock, flags);
458 #if !defined(ENABLE_HDM_TEST)
459 dim2_tasklet.data = (unsigned long)dev;
460 tasklet_schedule(&dim2_tasklet);
462 dim2_tasklet_fn((unsigned long)dev);
467 #if defined(ENABLE_HDM_TEST)
470 * Utility function used by HAL-simu for calling DIM interrupt handler.
471 * It is used only for TEST PURPOSE.
473 void raise_dim_interrupt(void)
475 (void)dim2_ahb_isr(0, test_dev);
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_entry(head->next, 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,
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, buf_size);
563 case MOST_CH_ISOC_AVP:
564 new_size = dim_norm_isoc_buffer_size(buf_size, sub_size);
566 pr_err("%s: invalid sub-buffer size or too small buffer size\n",
570 ccfg->buffer_size = new_size;
571 if (new_size != buf_size)
572 pr_warn("%s: fixed buffer size (%d -> %d)\n",
573 hdm_ch->name, buf_size, new_size);
574 spin_lock_irqsave(&dim_lock, flags);
575 hal_ret = dim_init_isoc(&hdm_ch->ch, is_tx, ch_addr, sub_size);
578 new_size = dim_norm_sync_buffer_size(buf_size, sub_size);
580 pr_err("%s: invalid sub-buffer size or too small buffer size\n",
584 ccfg->buffer_size = new_size;
585 if (new_size != buf_size)
586 pr_warn("%s: fixed buffer size (%d -> %d)\n",
587 hdm_ch->name, buf_size, new_size);
588 spin_lock_irqsave(&dim_lock, flags);
589 hal_ret = dim_init_sync(&hdm_ch->ch, is_tx, ch_addr, sub_size);
592 pr_err("%s: configure failed, bad channel type: %d\n",
593 hdm_ch->name, ccfg->data_type);
597 if (hal_ret != DIM_NO_ERROR) {
598 spin_unlock_irqrestore(&dim_lock, flags);
599 pr_err("%s: configure failed (%d), type: %d, is_tx: %d\n",
600 hdm_ch->name, hal_ret, ccfg->data_type, (int)is_tx);
604 hdm_ch->data_type = ccfg->data_type;
605 hdm_ch->direction = ccfg->direction;
606 hdm_ch->is_initialized = true;
608 if (hdm_ch->data_type == MOST_CH_ASYNC &&
609 hdm_ch->direction == MOST_CH_TX &&
611 dev->atx_idx = ch_idx;
613 spin_unlock_irqrestore(&dim_lock, flags);
619 * enqueue - enqueue a buffer for data transfer
620 * @iface: intended interface
621 * @channel: ID of the channel the buffer is intended for
622 * @mbo: pointer to the buffer object
624 * Push the buffer into pending_list and try to transfer one buffer from
625 * pending_list. Return 0 on success, negative on failure.
627 static int enqueue(struct most_interface *most_iface, int ch_idx,
630 struct dim2_hdm *dev = iface_to_hdm(most_iface);
631 struct hdm_channel *hdm_ch = dev->hch + ch_idx;
634 BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
636 if (!hdm_ch->is_initialized)
639 if (mbo->bus_address == 0)
642 spin_lock_irqsave(&dim_lock, flags);
643 list_add_tail(&mbo->list, &hdm_ch->pending_list);
644 spin_unlock_irqrestore(&dim_lock, flags);
646 (void)try_start_dim_transfer(hdm_ch);
652 * request_netinfo - triggers retrieving of network info
653 * @iface: pointer to the interface
654 * @channel_id: corresponding channel ID
656 * Send a command to INIC which triggers retrieving of network info by means of
657 * "Message exchange over MDP/MEP". Return 0 on success, negative on failure.
659 static void request_netinfo(struct most_interface *most_iface, int ch_idx)
661 struct dim2_hdm *dev = iface_to_hdm(most_iface);
665 if (dev->atx_idx < 0) {
666 pr_err("Async Tx Not initialized\n");
670 mbo = most_get_mbo(&dev->most_iface, dev->atx_idx, NULL);
674 mbo->buffer_length = 5;
676 data = mbo->virt_address;
678 data[0] = 0x00; /* PML High byte */
679 data[1] = 0x03; /* PML Low byte */
680 data[2] = 0x02; /* PMHL */
681 data[3] = 0x08; /* FPH */
682 data[4] = 0x40; /* FMF (FIFO cmd msg - Triggers NAOverMDP) */
684 most_submit_mbo(mbo);
688 * poison_channel - poison buffers of a channel
689 * @iface: pointer to the interface the channel to be poisoned belongs to
690 * @channel_id: corresponding channel ID
692 * Destroy a channel and complete all the buffers in both started_list &
693 * pending_list. Return 0 on success, negative on failure.
695 static int poison_channel(struct most_interface *most_iface, int ch_idx)
697 struct dim2_hdm *dev = iface_to_hdm(most_iface);
698 struct hdm_channel *hdm_ch = dev->hch + ch_idx;
703 BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
705 if (!hdm_ch->is_initialized)
708 spin_lock_irqsave(&dim_lock, flags);
709 hal_ret = dim_destroy_channel(&hdm_ch->ch);
710 hdm_ch->is_initialized = false;
711 if (ch_idx == dev->atx_idx)
713 spin_unlock_irqrestore(&dim_lock, flags);
714 if (hal_ret != DIM_NO_ERROR) {
715 pr_err("HAL Failed to close channel %s\n", hdm_ch->name);
719 complete_all_mbos(&hdm_ch->started_list);
720 complete_all_mbos(&hdm_ch->pending_list);
726 * dim2_probe - dim2 probe handler
727 * @pdev: platform device structure
729 * Register the dim2 interface with mostcore and initialize it.
730 * Return 0 on success, negative on failure.
732 static int dim2_probe(struct platform_device *pdev)
734 struct dim2_hdm *dev;
735 struct resource *res;
737 struct kobject *kobj;
739 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
745 platform_set_drvdata(pdev, dev);
746 #if defined(ENABLE_HDM_TEST)
749 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
751 pr_err("no memory region defined\n");
756 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
757 pr_err("failed to request mem region\n");
762 dev->io_base = ioremap(res->start, resource_size(res));
764 pr_err("failed to ioremap\n");
766 goto err_release_mem;
769 ret = platform_get_irq(pdev, 0);
771 pr_err("failed to get irq\n");
776 ret = request_irq(dev->irq_ahb0, dim2_ahb_isr, 0, "mlb_ahb0", dev);
778 pr_err("failed to request IRQ: %d, err: %d\n",
783 init_waitqueue_head(&dev->netinfo_waitq);
784 dev->deliver_netinfo = 0;
785 dev->netinfo_task = kthread_run(&deliver_netinfo_thread, (void *)dev,
787 if (IS_ERR(dev->netinfo_task)) {
788 ret = PTR_ERR(dev->netinfo_task);
792 for (i = 0; i < DMA_CHANNELS; i++) {
793 struct most_channel_capability *cap = dev->capabilities + i;
794 struct hdm_channel *hdm_ch = dev->hch + i;
796 INIT_LIST_HEAD(&hdm_ch->pending_list);
797 INIT_LIST_HEAD(&hdm_ch->started_list);
798 hdm_ch->is_initialized = false;
799 snprintf(hdm_ch->name, sizeof(hdm_ch->name), "ca%d", i * 2 + 2);
801 cap->name_suffix = hdm_ch->name;
802 cap->direction = MOST_CH_RX | MOST_CH_TX;
803 cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
804 MOST_CH_ISOC_AVP | MOST_CH_SYNC;
805 cap->num_buffers_packet = MAX_BUFFERS_PACKET;
806 cap->buffer_size_packet = MAX_BUF_SIZE_PACKET;
807 cap->num_buffers_streaming = MAX_BUFFERS_STREAMING;
808 cap->buffer_size_streaming = MAX_BUF_SIZE_STREAMING;
814 if (sizeof(res->start) == sizeof(long long))
815 fmt = "dim2-%016llx";
816 else if (sizeof(res->start) == sizeof(long))
821 snprintf(dev->name, sizeof(dev->name), fmt, res->start);
824 dev->most_iface.interface = ITYPE_MEDIALB_DIM2;
825 dev->most_iface.description = dev->name;
826 dev->most_iface.num_channels = DMA_CHANNELS;
827 dev->most_iface.channel_vector = dev->capabilities;
828 dev->most_iface.configure = configure_channel;
829 dev->most_iface.enqueue = enqueue;
830 dev->most_iface.poison_channel = poison_channel;
831 dev->most_iface.request_netinfo = request_netinfo;
833 kobj = most_register_interface(&dev->most_iface);
836 pr_err("failed to register MOST interface\n");
837 goto err_stop_thread;
840 ret = dim2_sysfs_probe(&dev->bus, kobj);
842 goto err_unreg_iface;
844 ret = startup_dim(pdev);
846 pr_err("failed to initialize DIM2\n");
847 goto err_destroy_bus;
853 dim2_sysfs_destroy(&dev->bus);
855 most_deregister_interface(&dev->most_iface);
857 kthread_stop(dev->netinfo_task);
859 #if !defined(ENABLE_HDM_TEST)
860 free_irq(dev->irq_ahb0, dev);
862 iounmap(dev->io_base);
864 release_mem_region(res->start, resource_size(res));
873 * dim2_remove - dim2 remove handler
874 * @pdev: platform device structure
876 * Unregister the interface from mostcore
878 static int dim2_remove(struct platform_device *pdev)
880 struct dim2_hdm *dev = platform_get_drvdata(pdev);
881 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
882 struct dim2_platform_data *pdata = pdev->dev.platform_data;
885 spin_lock_irqsave(&dim_lock, flags);
887 spin_unlock_irqrestore(&dim_lock, flags);
889 if (pdata && pdata->destroy)
890 pdata->destroy(pdata);
892 dim2_sysfs_destroy(&dev->bus);
893 most_deregister_interface(&dev->most_iface);
894 kthread_stop(dev->netinfo_task);
895 #if !defined(ENABLE_HDM_TEST)
896 free_irq(dev->irq_ahb0, dev);
897 iounmap(dev->io_base);
898 release_mem_region(res->start, resource_size(res));
901 platform_set_drvdata(pdev, NULL);
904 * break link to local platform_device_id struct
905 * to prevent crash by unload platform device module
907 pdev->id_entry = NULL;
912 static struct platform_device_id dim2_id[] = {
914 { }, /* Terminating entry */
917 MODULE_DEVICE_TABLE(platform, dim2_id);
919 static struct platform_driver dim2_driver = {
921 .remove = dim2_remove,
928 module_platform_driver(dim2_driver);
930 MODULE_AUTHOR("Jain Roy Ambi <JainRoy.Ambi@microchip.com>");
931 MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
932 MODULE_DESCRIPTION("MediaLB DIM2 Hardware Dependent Module");
933 MODULE_LICENSE("GPL");