+++ /dev/null
-/*
- * dim2_hdm.c - MediaLB DIM2 Hardware Dependent Module
- *
- * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * This file is licensed under GPLv2.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/printk.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/dma-mapping.h>
-#include <linux/sched.h>
-#include <linux/kthread.h>
-
-#include <mostcore.h>
-#include <networking.h>
-#include "dim2_hal.h"
-#include "dim2_hdm.h"
-#include "dim2_errors.h"
-#include "dim2_sysfs.h"
-
-#define DMA_CHANNELS (32 - 1) /* channel 0 is a system channel */
-
-#define MAX_BUFFERS_PACKET 32
-#define MAX_BUFFERS_STREAMING 32
-#define MAX_BUF_SIZE_PACKET 2048
-#define MAX_BUF_SIZE_STREAMING (8 * 1024)
-
-/* command line parameter to select clock speed */
-static char *clock_speed;
-module_param(clock_speed, charp, 0);
-MODULE_PARM_DESC(clock_speed, "MediaLB Clock Speed");
-
-/*
- * #############################################################################
- *
- * The define below activates an utility function used by HAL-simu
- * for calling DIM interrupt handler.
- * It is used only for TEST PURPOSE and shall be commented before release.
- *
- * #############################################################################
- */
-/* #define ENABLE_HDM_TEST */
-
-static DEFINE_SPINLOCK(dim_lock);
-
-static void dim2_tasklet_fn(unsigned long data);
-static DECLARE_TASKLET(dim2_tasklet, dim2_tasklet_fn, 0);
-
-/**
- * struct hdm_channel - private structure to keep channel specific data
- * @is_initialized: identifier to know whether the channel is initialized
- * @ch: HAL specific channel data
- * @pending_list: list to keep MBO's before starting transfer
- * @started_list: list to keep MBO's after starting transfer
- * @direction: channel direction (TX or RX)
- * @data_type: channel data type
- */
-struct hdm_channel {
- char name[sizeof "caNNN"];
- bool is_initialized;
- struct dim_channel ch;
- struct list_head pending_list; /* before dim_enqueue_buffer() */
- struct list_head started_list; /* after dim_enqueue_buffer() */
- enum most_channel_direction direction;
- enum most_channel_data_type data_type;
-};
-
-/**
- * struct dim2_hdm - private structure to keep interface specific data
- * @hch: an array of channel specific data
- * @most_iface: most interface structure
- * @capabilities: an array of channel capability data
- * @io_base: I/O register base address
- * @irq_ahb0: dim2 AHB0 irq number
- * @clk_speed: user selectable (through command line parameter) clock speed
- * @netinfo_task: thread to deliver network status
- * @netinfo_waitq: waitq for the thread to sleep
- * @deliver_netinfo: to identify whether network status received
- * @mac_addrs: INIC mac address
- * @link_state: network link state
- * @atx_idx: index of async tx channel
- */
-struct dim2_hdm {
- struct hdm_channel hch[DMA_CHANNELS];
- struct most_channel_capability capabilities[DMA_CHANNELS];
- struct most_interface most_iface;
- char name[16 + sizeof "dim2-"];
- void *io_base;
- unsigned int irq_ahb0;
- int clk_speed;
- struct task_struct *netinfo_task;
- wait_queue_head_t netinfo_waitq;
- int deliver_netinfo;
- unsigned char mac_addrs[6];
- unsigned char link_state;
- int atx_idx;
- struct medialb_bus bus;
-};
-
-#define iface_to_hdm(iface) container_of(iface, struct dim2_hdm, most_iface)
-
-/* Macro to identify a network status message */
-#define PACKET_IS_NET_INFO(p) \
- (((p)[1] == 0x18) && ((p)[2] == 0x05) && ((p)[3] == 0x0C) && \
- ((p)[13] == 0x3C) && ((p)[14] == 0x00) && ((p)[15] == 0x0A))
-
-#if defined(ENABLE_HDM_TEST)
-static struct dim2_hdm *test_dev;
-#endif
-
-bool dim2_sysfs_get_state_cb(void)
-{
- bool state;
- unsigned long flags;
-
- spin_lock_irqsave(&dim_lock, flags);
- state = dim_get_lock_state();
- spin_unlock_irqrestore(&dim_lock, flags);
-
- return state;
-}
-
-/**
- * dimcb_io_read - callback from HAL to read an I/O register
- * @ptr32: register address
- */
-u32 dimcb_io_read(u32 *ptr32)
-{
- return readl(ptr32);
-}
-
-/**
- * dimcb_io_write - callback from HAL to write value to an I/O register
- * @ptr32: register address
- * @value: value to write
- */
-void dimcb_io_write(u32 *ptr32, u32 value)
-{
- writel(value, ptr32);
-}
-
-/**
- * dimcb_on_error - callback from HAL to report miscommunication between
- * HDM and HAL
- * @error_id: Error ID
- * @error_message: Error message. Some text in a free format
- */
-void dimcb_on_error(u8 error_id, const char *error_message)
-{
- pr_err("dimcb_on_error: error_id - %d, error_message - %s\n", error_id,
- error_message);
-}
-
-/**
- * startup_dim - initialize the dim2 interface
- * @pdev: platform device
- *
- * Get the value of command line parameter "clock_speed" if given or use the
- * default value, enable the clock and PLL, and initialize the dim2 interface.
- */
-static int startup_dim(struct platform_device *pdev)
-{
- struct dim2_hdm *dev = platform_get_drvdata(pdev);
- struct dim2_platform_data *pdata = pdev->dev.platform_data;
- u8 hal_ret;
-
- dev->clk_speed = -1;
-
- if (clock_speed) {
- if (!strcmp(clock_speed, "256fs"))
- dev->clk_speed = CLK_256FS;
- else if (!strcmp(clock_speed, "512fs"))
- dev->clk_speed = CLK_512FS;
- else if (!strcmp(clock_speed, "1024fs"))
- dev->clk_speed = CLK_1024FS;
- else if (!strcmp(clock_speed, "2048fs"))
- dev->clk_speed = CLK_2048FS;
- else if (!strcmp(clock_speed, "3072fs"))
- dev->clk_speed = CLK_3072FS;
- else if (!strcmp(clock_speed, "4096fs"))
- dev->clk_speed = CLK_4096FS;
- else if (!strcmp(clock_speed, "6144fs"))
- dev->clk_speed = CLK_6144FS;
- else if (!strcmp(clock_speed, "8192fs"))
- dev->clk_speed = CLK_8192FS;
- }
-
- if (dev->clk_speed == -1) {
- pr_info("Bad or missing clock speed parameter, using default value: 3072fs\n");
- dev->clk_speed = CLK_3072FS;
- } else {
- pr_info("Selected clock speed: %s\n", clock_speed);
- }
- if (pdata && pdata->init) {
- int ret = pdata->init(pdata, dev->io_base, dev->clk_speed);
-
- if (ret)
- return ret;
- }
-
- hal_ret = dim_startup(dev->io_base, dev->clk_speed);
- if (hal_ret != DIM_NO_ERROR) {
- pr_err("dim_startup failed: %d\n", hal_ret);
- if (pdata && pdata->destroy)
- pdata->destroy(pdata);
- return -ENODEV;
- }
-
- return 0;
-}
-
-/**
- * try_start_dim_transfer - try to transfer a buffer on a channel
- * @hdm_ch: channel specific data
- *
- * Transfer a buffer from pending_list if the channel is ready
- */
-static int try_start_dim_transfer(struct hdm_channel *hdm_ch)
-{
- u16 buf_size;
- struct list_head *head = &hdm_ch->pending_list;
- struct mbo *mbo;
- unsigned long flags;
- struct dim_ch_state_t st;
-
- BUG_ON(!hdm_ch);
- BUG_ON(!hdm_ch->is_initialized);
-
- spin_lock_irqsave(&dim_lock, flags);
- if (list_empty(head)) {
- spin_unlock_irqrestore(&dim_lock, flags);
- return -EAGAIN;
- }
-
- if (!dim_get_channel_state(&hdm_ch->ch, &st)->ready) {
- spin_unlock_irqrestore(&dim_lock, flags);
- return -EAGAIN;
- }
-
- mbo = list_entry(head->next, struct mbo, list);
- buf_size = mbo->buffer_length;
-
- BUG_ON(mbo->bus_address == 0);
- if (!dim_enqueue_buffer(&hdm_ch->ch, mbo->bus_address, buf_size)) {
- list_del(head->next);
- spin_unlock_irqrestore(&dim_lock, flags);
- mbo->processed_length = 0;
- mbo->status = MBO_E_INVAL;
- mbo->complete(mbo);
- return -EFAULT;
- }
-
- list_move_tail(head->next, &hdm_ch->started_list);
- spin_unlock_irqrestore(&dim_lock, flags);
-
- return 0;
-}
-
-/**
- * deliver_netinfo_thread - thread to deliver network status to mostcore
- * @data: private data
- *
- * Wait for network status and deliver it to mostcore once it is received
- */
-static int deliver_netinfo_thread(void *data)
-{
- struct dim2_hdm *dev = data;
-
- while (!kthread_should_stop()) {
- wait_event_interruptible(dev->netinfo_waitq,
- dev->deliver_netinfo ||
- kthread_should_stop());
-
- if (dev->deliver_netinfo) {
- dev->deliver_netinfo--;
- most_deliver_netinfo(&dev->most_iface, dev->link_state,
- dev->mac_addrs);
- }
- }
-
- return 0;
-}
-
-/**
- * retrieve_netinfo - retrieve network status from received buffer
- * @dev: private data
- * @mbo: received MBO
- *
- * Parse the message in buffer and get node address, link state, MAC address.
- * Wake up a thread to deliver this status to mostcore
- */
-static void retrieve_netinfo(struct dim2_hdm *dev, struct mbo *mbo)
-{
- u8 *data = mbo->virt_address;
- u8 *mac = dev->mac_addrs;
-
- pr_info("Node Address: 0x%03x\n", (u16)data[16] << 8 | data[17]);
- dev->link_state = data[18];
- pr_info("NIState: %d\n", dev->link_state);
- memcpy(mac, data + 19, 6);
- pr_info("MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n",
- mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
- dev->deliver_netinfo++;
- wake_up_interruptible(&dev->netinfo_waitq);
-}
-
-/**
- * service_done_flag - handle completed buffers
- * @dev: private data
- * @ch_idx: channel index
- *
- * Return back the completed buffers to mostcore, using completion callback
- */
-static void service_done_flag(struct dim2_hdm *dev, int ch_idx)
-{
- struct hdm_channel *hdm_ch = dev->hch + ch_idx;
- struct dim_ch_state_t st;
- struct list_head *head;
- struct mbo *mbo;
- int done_buffers;
- unsigned long flags;
- u8 *data;
-
- BUG_ON(!hdm_ch);
- BUG_ON(!hdm_ch->is_initialized);
-
- spin_lock_irqsave(&dim_lock, flags);
-
- done_buffers = dim_get_channel_state(&hdm_ch->ch, &st)->done_buffers;
- if (!done_buffers) {
- spin_unlock_irqrestore(&dim_lock, flags);
- return;
- }
-
- if (!dim_detach_buffers(&hdm_ch->ch, done_buffers)) {
- spin_unlock_irqrestore(&dim_lock, flags);
- return;
- }
- spin_unlock_irqrestore(&dim_lock, flags);
-
- head = &hdm_ch->started_list;
-
- while (done_buffers) {
- spin_lock_irqsave(&dim_lock, flags);
- if (list_empty(head)) {
- spin_unlock_irqrestore(&dim_lock, flags);
- pr_crit("hard error: started_mbo list is empty whereas DIM2 has sent buffers\n");
- break;
- }
-
- mbo = list_entry(head->next, struct mbo, list);
- list_del(head->next);
- spin_unlock_irqrestore(&dim_lock, flags);
-
- data = mbo->virt_address;
-
- if (hdm_ch->data_type == MOST_CH_ASYNC &&
- hdm_ch->direction == MOST_CH_RX &&
- PACKET_IS_NET_INFO(data)) {
- retrieve_netinfo(dev, mbo);
-
- spin_lock_irqsave(&dim_lock, flags);
- list_add_tail(&mbo->list, &hdm_ch->pending_list);
- spin_unlock_irqrestore(&dim_lock, flags);
- } else {
- if (hdm_ch->data_type == MOST_CH_CONTROL ||
- hdm_ch->data_type == MOST_CH_ASYNC) {
- u32 const data_size =
- (u32)data[0] * 256 + data[1] + 2;
-
- mbo->processed_length =
- min_t(u32, data_size,
- mbo->buffer_length);
- } else {
- mbo->processed_length = mbo->buffer_length;
- }
- mbo->status = MBO_SUCCESS;
- mbo->complete(mbo);
- }
-
- done_buffers--;
- }
-}
-
-static struct dim_channel **get_active_channels(struct dim2_hdm *dev,
- struct dim_channel **buffer)
-{
- int idx = 0;
- int ch_idx;
-
- for (ch_idx = 0; ch_idx < DMA_CHANNELS; ch_idx++) {
- if (dev->hch[ch_idx].is_initialized)
- buffer[idx++] = &dev->hch[ch_idx].ch;
- }
- buffer[idx++] = NULL;
-
- return buffer;
-}
-
-/**
- * dim2_tasklet_fn - tasklet function
- * @data: private data
- *
- * Service each initialized channel, if needed
- */
-static void dim2_tasklet_fn(unsigned long data)
-{
- struct dim2_hdm *dev = (struct dim2_hdm *)data;
- unsigned long flags;
- int ch_idx;
-
- for (ch_idx = 0; ch_idx < DMA_CHANNELS; ch_idx++) {
- if (!dev->hch[ch_idx].is_initialized)
- continue;
-
- spin_lock_irqsave(&dim_lock, flags);
- dim_service_channel(&dev->hch[ch_idx].ch);
- spin_unlock_irqrestore(&dim_lock, flags);
-
- service_done_flag(dev, ch_idx);
- while (!try_start_dim_transfer(dev->hch + ch_idx))
- continue;
- }
-}
-
-/**
- * dim2_ahb_isr - interrupt service routine
- * @irq: irq number
- * @_dev: private data
- *
- * Acknowledge the interrupt and schedule a tasklet to service channels.
- * Return IRQ_HANDLED.
- */
-static irqreturn_t dim2_ahb_isr(int irq, void *_dev)
-{
- struct dim2_hdm *dev = _dev;
- struct dim_channel *buffer[DMA_CHANNELS + 1];
- unsigned long flags;
-
- spin_lock_irqsave(&dim_lock, flags);
- dim_service_irq(get_active_channels(dev, buffer));
- spin_unlock_irqrestore(&dim_lock, flags);
-
-#if !defined(ENABLE_HDM_TEST)
- dim2_tasklet.data = (unsigned long)dev;
- tasklet_schedule(&dim2_tasklet);
-#else
- dim2_tasklet_fn((unsigned long)dev);
-#endif
- return IRQ_HANDLED;
-}
-
-#if defined(ENABLE_HDM_TEST)
-
-/*
- * Utility function used by HAL-simu for calling DIM interrupt handler.
- * It is used only for TEST PURPOSE.
- */
-void raise_dim_interrupt(void)
-{
- (void)dim2_ahb_isr(0, test_dev);
-}
-#endif
-
-/**
- * complete_all_mbos - complete MBO's in a list
- * @head: list head
- *
- * Delete all the entries in list and return back MBO's to mostcore using
- * completion call back.
- */
-static void complete_all_mbos(struct list_head *head)
-{
- unsigned long flags;
- struct mbo *mbo;
-
- for (;;) {
- spin_lock_irqsave(&dim_lock, flags);
- if (list_empty(head)) {
- spin_unlock_irqrestore(&dim_lock, flags);
- break;
- }
-
- mbo = list_entry(head->next, struct mbo, list);
- list_del(head->next);
- spin_unlock_irqrestore(&dim_lock, flags);
-
- mbo->processed_length = 0;
- mbo->status = MBO_E_CLOSE;
- mbo->complete(mbo);
- }
-}
-
-/**
- * configure_channel - initialize a channel
- * @iface: interface the channel belongs to
- * @channel: channel to be configured
- * @channel_config: structure that holds the configuration information
- *
- * Receives configuration information from mostcore and initialize
- * the corresponding channel. Return 0 on success, negative on failure.
- */
-static int configure_channel(struct most_interface *most_iface, int ch_idx,
- struct most_channel_config *ccfg)
-{
- struct dim2_hdm *dev = iface_to_hdm(most_iface);
- bool const is_tx = ccfg->direction == MOST_CH_TX;
- u16 const sub_size = ccfg->subbuffer_size;
- u16 const buf_size = ccfg->buffer_size;
- u16 new_size;
- unsigned long flags;
- u8 hal_ret;
- int const ch_addr = ch_idx * 2 + 2;
- struct hdm_channel *const hdm_ch = dev->hch + ch_idx;
-
- BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
-
- if (hdm_ch->is_initialized)
- return -EPERM;
-
- switch (ccfg->data_type) {
- case MOST_CH_CONTROL:
- new_size = dim_norm_ctrl_async_buffer_size(buf_size);
- if (new_size == 0) {
- pr_err("%s: too small buffer size\n", hdm_ch->name);
- return -EINVAL;
- }
- ccfg->buffer_size = new_size;
- if (new_size != buf_size)
- pr_warn("%s: fixed buffer size (%d -> %d)\n",
- hdm_ch->name, buf_size, new_size);
- spin_lock_irqsave(&dim_lock, flags);
- hal_ret = dim_init_control(&hdm_ch->ch, is_tx, ch_addr,
- buf_size);
- break;
- case MOST_CH_ASYNC:
- new_size = dim_norm_ctrl_async_buffer_size(buf_size);
- if (new_size == 0) {
- pr_err("%s: too small buffer size\n", hdm_ch->name);
- return -EINVAL;
- }
- ccfg->buffer_size = new_size;
- if (new_size != buf_size)
- pr_warn("%s: fixed buffer size (%d -> %d)\n",
- hdm_ch->name, buf_size, new_size);
- spin_lock_irqsave(&dim_lock, flags);
- hal_ret = dim_init_async(&hdm_ch->ch, is_tx, ch_addr, buf_size);
- break;
- case MOST_CH_ISOC_AVP:
- new_size = dim_norm_isoc_buffer_size(buf_size, sub_size);
- if (new_size == 0) {
- pr_err("%s: invalid sub-buffer size or too small buffer size\n",
- hdm_ch->name);
- return -EINVAL;
- }
- ccfg->buffer_size = new_size;
- if (new_size != buf_size)
- pr_warn("%s: fixed buffer size (%d -> %d)\n",
- hdm_ch->name, buf_size, new_size);
- spin_lock_irqsave(&dim_lock, flags);
- hal_ret = dim_init_isoc(&hdm_ch->ch, is_tx, ch_addr, sub_size);
- break;
- case MOST_CH_SYNC:
- new_size = dim_norm_sync_buffer_size(buf_size, sub_size);
- if (new_size == 0) {
- pr_err("%s: invalid sub-buffer size or too small buffer size\n",
- hdm_ch->name);
- return -EINVAL;
- }
- ccfg->buffer_size = new_size;
- if (new_size != buf_size)
- pr_warn("%s: fixed buffer size (%d -> %d)\n",
- hdm_ch->name, buf_size, new_size);
- spin_lock_irqsave(&dim_lock, flags);
- hal_ret = dim_init_sync(&hdm_ch->ch, is_tx, ch_addr, sub_size);
- break;
- default:
- pr_err("%s: configure failed, bad channel type: %d\n",
- hdm_ch->name, ccfg->data_type);
- return -EINVAL;
- }
-
- if (hal_ret != DIM_NO_ERROR) {
- spin_unlock_irqrestore(&dim_lock, flags);
- pr_err("%s: configure failed (%d), type: %d, is_tx: %d\n",
- hdm_ch->name, hal_ret, ccfg->data_type, (int)is_tx);
- return -ENODEV;
- }
-
- hdm_ch->data_type = ccfg->data_type;
- hdm_ch->direction = ccfg->direction;
- hdm_ch->is_initialized = true;
-
- if (hdm_ch->data_type == MOST_CH_ASYNC &&
- hdm_ch->direction == MOST_CH_TX &&
- dev->atx_idx < 0)
- dev->atx_idx = ch_idx;
-
- spin_unlock_irqrestore(&dim_lock, flags);
-
- return 0;
-}
-
-/**
- * enqueue - enqueue a buffer for data transfer
- * @iface: intended interface
- * @channel: ID of the channel the buffer is intended for
- * @mbo: pointer to the buffer object
- *
- * Push the buffer into pending_list and try to transfer one buffer from
- * pending_list. Return 0 on success, negative on failure.
- */
-static int enqueue(struct most_interface *most_iface, int ch_idx,
- struct mbo *mbo)
-{
- struct dim2_hdm *dev = iface_to_hdm(most_iface);
- struct hdm_channel *hdm_ch = dev->hch + ch_idx;
- unsigned long flags;
-
- BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
-
- if (!hdm_ch->is_initialized)
- return -EPERM;
-
- if (mbo->bus_address == 0)
- return -EFAULT;
-
- spin_lock_irqsave(&dim_lock, flags);
- list_add_tail(&mbo->list, &hdm_ch->pending_list);
- spin_unlock_irqrestore(&dim_lock, flags);
-
- (void)try_start_dim_transfer(hdm_ch);
-
- return 0;
-}
-
-/**
- * request_netinfo - triggers retrieving of network info
- * @iface: pointer to the interface
- * @channel_id: corresponding channel ID
- *
- * Send a command to INIC which triggers retrieving of network info by means of
- * "Message exchange over MDP/MEP". Return 0 on success, negative on failure.
- */
-static void request_netinfo(struct most_interface *most_iface, int ch_idx)
-{
- struct dim2_hdm *dev = iface_to_hdm(most_iface);
- struct mbo *mbo;
- u8 *data;
-
- if (dev->atx_idx < 0) {
- pr_err("Async Tx Not initialized\n");
- return;
- }
-
- mbo = most_get_mbo(&dev->most_iface, dev->atx_idx, NULL);
- if (!mbo)
- return;
-
- mbo->buffer_length = 5;
-
- data = mbo->virt_address;
-
- data[0] = 0x00; /* PML High byte */
- data[1] = 0x03; /* PML Low byte */
- data[2] = 0x02; /* PMHL */
- data[3] = 0x08; /* FPH */
- data[4] = 0x40; /* FMF (FIFO cmd msg - Triggers NAOverMDP) */
-
- most_submit_mbo(mbo);
-}
-
-/**
- * poison_channel - poison buffers of a channel
- * @iface: pointer to the interface the channel to be poisoned belongs to
- * @channel_id: corresponding channel ID
- *
- * Destroy a channel and complete all the buffers in both started_list &
- * pending_list. Return 0 on success, negative on failure.
- */
-static int poison_channel(struct most_interface *most_iface, int ch_idx)
-{
- struct dim2_hdm *dev = iface_to_hdm(most_iface);
- struct hdm_channel *hdm_ch = dev->hch + ch_idx;
- unsigned long flags;
- u8 hal_ret;
- int ret = 0;
-
- BUG_ON(ch_idx < 0 || ch_idx >= DMA_CHANNELS);
-
- if (!hdm_ch->is_initialized)
- return -EPERM;
-
- spin_lock_irqsave(&dim_lock, flags);
- hal_ret = dim_destroy_channel(&hdm_ch->ch);
- hdm_ch->is_initialized = false;
- if (ch_idx == dev->atx_idx)
- dev->atx_idx = -1;
- spin_unlock_irqrestore(&dim_lock, flags);
- if (hal_ret != DIM_NO_ERROR) {
- pr_err("HAL Failed to close channel %s\n", hdm_ch->name);
- ret = -EFAULT;
- }
-
- complete_all_mbos(&hdm_ch->started_list);
- complete_all_mbos(&hdm_ch->pending_list);
-
- return ret;
-}
-
-/*
- * dim2_probe - dim2 probe handler
- * @pdev: platform device structure
- *
- * Register the dim2 interface with mostcore and initialize it.
- * Return 0 on success, negative on failure.
- */
-static int dim2_probe(struct platform_device *pdev)
-{
- struct dim2_hdm *dev;
- struct resource *res;
- int ret, i;
- struct kobject *kobj;
-
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
-
- dev->atx_idx = -1;
-
- platform_set_drvdata(pdev, dev);
-#if defined(ENABLE_HDM_TEST)
- test_dev = dev;
-#else
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- pr_err("no memory region defined\n");
- ret = -ENOENT;
- goto err_free_dev;
- }
-
- if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
- pr_err("failed to request mem region\n");
- ret = -EBUSY;
- goto err_free_dev;
- }
-
- dev->io_base = ioremap(res->start, resource_size(res));
- if (!dev->io_base) {
- pr_err("failed to ioremap\n");
- ret = -ENOMEM;
- goto err_release_mem;
- }
-
- ret = platform_get_irq(pdev, 0);
- if (ret < 0) {
- pr_err("failed to get irq\n");
- goto err_unmap_io;
- }
- dev->irq_ahb0 = ret;
-
- ret = request_irq(dev->irq_ahb0, dim2_ahb_isr, 0, "mlb_ahb0", dev);
- if (ret) {
- pr_err("failed to request IRQ: %d, err: %d\n",
- dev->irq_ahb0, ret);
- goto err_unmap_io;
- }
-#endif
- init_waitqueue_head(&dev->netinfo_waitq);
- dev->deliver_netinfo = 0;
- dev->netinfo_task = kthread_run(&deliver_netinfo_thread, (void *)dev,
- "dim2_netinfo");
- if (IS_ERR(dev->netinfo_task)) {
- ret = PTR_ERR(dev->netinfo_task);
- goto err_free_irq;
- }
-
- for (i = 0; i < DMA_CHANNELS; i++) {
- struct most_channel_capability *cap = dev->capabilities + i;
- struct hdm_channel *hdm_ch = dev->hch + i;
-
- INIT_LIST_HEAD(&hdm_ch->pending_list);
- INIT_LIST_HEAD(&hdm_ch->started_list);
- hdm_ch->is_initialized = false;
- snprintf(hdm_ch->name, sizeof(hdm_ch->name), "ca%d", i * 2 + 2);
-
- cap->name_suffix = hdm_ch->name;
- cap->direction = MOST_CH_RX | MOST_CH_TX;
- cap->data_type = MOST_CH_CONTROL | MOST_CH_ASYNC |
- MOST_CH_ISOC_AVP | MOST_CH_SYNC;
- cap->num_buffers_packet = MAX_BUFFERS_PACKET;
- cap->buffer_size_packet = MAX_BUF_SIZE_PACKET;
- cap->num_buffers_streaming = MAX_BUFFERS_STREAMING;
- cap->buffer_size_streaming = MAX_BUF_SIZE_STREAMING;
- }
-
- {
- const char *fmt;
-
- if (sizeof(res->start) == sizeof(long long))
- fmt = "dim2-%016llx";
- else if (sizeof(res->start) == sizeof(long))
- fmt = "dim2-%016lx";
- else
- fmt = "dim2-%016x";
-
- snprintf(dev->name, sizeof(dev->name), fmt, res->start);
- }
-
- dev->most_iface.interface = ITYPE_MEDIALB_DIM2;
- dev->most_iface.description = dev->name;
- dev->most_iface.num_channels = DMA_CHANNELS;
- dev->most_iface.channel_vector = dev->capabilities;
- dev->most_iface.configure = configure_channel;
- dev->most_iface.enqueue = enqueue;
- dev->most_iface.poison_channel = poison_channel;
- dev->most_iface.request_netinfo = request_netinfo;
-
- kobj = most_register_interface(&dev->most_iface);
- if (IS_ERR(kobj)) {
- ret = PTR_ERR(kobj);
- pr_err("failed to register MOST interface\n");
- goto err_stop_thread;
- }
-
- ret = dim2_sysfs_probe(&dev->bus, kobj);
- if (ret)
- goto err_unreg_iface;
-
- ret = startup_dim(pdev);
- if (ret) {
- pr_err("failed to initialize DIM2\n");
- goto err_destroy_bus;
- }
-
- return 0;
-
-err_destroy_bus:
- dim2_sysfs_destroy(&dev->bus);
-err_unreg_iface:
- most_deregister_interface(&dev->most_iface);
-err_stop_thread:
- kthread_stop(dev->netinfo_task);
-err_free_irq:
-#if !defined(ENABLE_HDM_TEST)
- free_irq(dev->irq_ahb0, dev);
-err_unmap_io:
- iounmap(dev->io_base);
-err_release_mem:
- release_mem_region(res->start, resource_size(res));
-err_free_dev:
-#endif
- kfree(dev);
-
- return ret;
-}
-
-/**
- * dim2_remove - dim2 remove handler
- * @pdev: platform device structure
- *
- * Unregister the interface from mostcore
- */
-static int dim2_remove(struct platform_device *pdev)
-{
- struct dim2_hdm *dev = platform_get_drvdata(pdev);
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct dim2_platform_data *pdata = pdev->dev.platform_data;
- unsigned long flags;
-
- spin_lock_irqsave(&dim_lock, flags);
- dim_shutdown();
- spin_unlock_irqrestore(&dim_lock, flags);
-
- if (pdata && pdata->destroy)
- pdata->destroy(pdata);
-
- dim2_sysfs_destroy(&dev->bus);
- most_deregister_interface(&dev->most_iface);
- kthread_stop(dev->netinfo_task);
-#if !defined(ENABLE_HDM_TEST)
- free_irq(dev->irq_ahb0, dev);
- iounmap(dev->io_base);
- release_mem_region(res->start, resource_size(res));
-#endif
- kfree(dev);
- platform_set_drvdata(pdev, NULL);
-
- /*
- * break link to local platform_device_id struct
- * to prevent crash by unload platform device module
- */
- pdev->id_entry = NULL;
-
- return 0;
-}
-
-static struct platform_device_id dim2_id[] = {
- { "medialb_dim2" },
- { }, /* Terminating entry */
-};
-
-MODULE_DEVICE_TABLE(platform, dim2_id);
-
-static struct platform_driver dim2_driver = {
- .probe = dim2_probe,
- .remove = dim2_remove,
- .id_table = dim2_id,
- .driver = {
- .name = "hdm_dim2",
- },
-};
-
-module_platform_driver(dim2_driver);
-
-MODULE_AUTHOR("Jain Roy Ambi <JainRoy.Ambi@microchip.com>");
-MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
-MODULE_DESCRIPTION("MediaLB DIM2 Hardware Dependent Module");
-MODULE_LICENSE("GPL");
Code Review / AGL / meta-agl-demo.git / blobdiff