diff options
Diffstat (limited to 'drivers/greybus/es2.c')
| -rw-r--r-- | drivers/greybus/es2.c | 1465 |
1 files changed, 1465 insertions, 0 deletions
diff --git a/drivers/greybus/es2.c b/drivers/greybus/es2.c new file mode 100644 index 000000000000..366716f11b1a --- /dev/null +++ b/drivers/greybus/es2.c @@ -0,0 +1,1465 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Greybus "AP" USB driver for "ES2" controller chips + * + * Copyright 2014-2015 Google Inc. + * Copyright 2014-2015 Linaro Ltd. + */ +#include <linux/kthread.h> +#include <linux/sizes.h> +#include <linux/usb.h> +#include <linux/kfifo.h> +#include <linux/debugfs.h> +#include <linux/list.h> +#include <linux/greybus.h> +#include <asm/unaligned.h> + +#include "arpc.h" +#include "greybus_trace.h" + + +/* Default timeout for USB vendor requests. */ +#define ES2_USB_CTRL_TIMEOUT 500 + +/* Default timeout for ARPC CPort requests */ +#define ES2_ARPC_CPORT_TIMEOUT 500 + +/* Fixed CPort numbers */ +#define ES2_CPORT_CDSI0 16 +#define ES2_CPORT_CDSI1 17 + +/* Memory sizes for the buffers sent to/from the ES2 controller */ +#define ES2_GBUF_MSG_SIZE_MAX 2048 + +/* Memory sizes for the ARPC buffers */ +#define ARPC_OUT_SIZE_MAX U16_MAX +#define ARPC_IN_SIZE_MAX 128 + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(0x18d1, 0x1eaf) }, + { }, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +#define APB1_LOG_SIZE SZ_16K + +/* + * Number of CPort IN urbs in flight at any point in time. + * Adjust if we are having stalls in the USB buffer due to not enough urbs in + * flight. + */ +#define NUM_CPORT_IN_URB 4 + +/* Number of CPort OUT urbs in flight at any point in time. + * Adjust if we get messages saying we are out of urbs in the system log. + */ +#define NUM_CPORT_OUT_URB 8 + +/* + * Number of ARPC in urbs in flight at any point in time. + */ +#define NUM_ARPC_IN_URB 2 + +/* + * @endpoint: bulk in endpoint for CPort data + * @urb: array of urbs for the CPort in messages + * @buffer: array of buffers for the @cport_in_urb urbs + */ +struct es2_cport_in { + __u8 endpoint; + struct urb *urb[NUM_CPORT_IN_URB]; + u8 *buffer[NUM_CPORT_IN_URB]; +}; + +/** + * es2_ap_dev - ES2 USB Bridge to AP structure + * @usb_dev: pointer to the USB device we are. + * @usb_intf: pointer to the USB interface we are bound to. + * @hd: pointer to our gb_host_device structure + + * @cport_in: endpoint, urbs and buffer for cport in messages + * @cport_out_endpoint: endpoint for for cport out messages + * @cport_out_urb: array of urbs for the CPort out messages + * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or + * not. + * @cport_out_urb_cancelled: array of flags indicating whether the + * corresponding @cport_out_urb is being cancelled + * @cport_out_urb_lock: locks the @cport_out_urb_busy "list" + * + * @apb_log_task: task pointer for logging thread + * @apb_log_dentry: file system entry for the log file interface + * @apb_log_enable_dentry: file system entry for enabling logging + * @apb_log_fifo: kernel FIFO to carry logged data + * @arpc_urb: array of urbs for the ARPC in messages + * @arpc_buffer: array of buffers for the @arpc_urb urbs + * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC + * @arpc_id_cycle: gives an unique id to ARPC + * @arpc_lock: locks ARPC list + * @arpcs: list of in progress ARPCs + */ +struct es2_ap_dev { + struct usb_device *usb_dev; + struct usb_interface *usb_intf; + struct gb_host_device *hd; + + struct es2_cport_in cport_in; + __u8 cport_out_endpoint; + struct urb *cport_out_urb[NUM_CPORT_OUT_URB]; + bool cport_out_urb_busy[NUM_CPORT_OUT_URB]; + bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB]; + spinlock_t cport_out_urb_lock; + + bool cdsi1_in_use; + + struct task_struct *apb_log_task; + struct dentry *apb_log_dentry; + struct dentry *apb_log_enable_dentry; + DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE); + + __u8 arpc_endpoint_in; + struct urb *arpc_urb[NUM_ARPC_IN_URB]; + u8 *arpc_buffer[NUM_ARPC_IN_URB]; + + int arpc_id_cycle; + spinlock_t arpc_lock; + struct list_head arpcs; +}; + +struct arpc { + struct list_head list; + struct arpc_request_message *req; + struct arpc_response_message *resp; + struct completion response_received; + bool active; +}; + +static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd) +{ + return (struct es2_ap_dev *)&hd->hd_priv; +} + +static void cport_out_callback(struct urb *urb); +static void usb_log_enable(struct es2_ap_dev *es2); +static void usb_log_disable(struct es2_ap_dev *es2); +static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, + size_t size, int *result, unsigned int timeout); + +static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) +{ + struct usb_device *udev = es2->usb_dev; + u8 *data; + int retval; + + data = kmemdup(req, size, GFP_KERNEL); + if (!data) + return -ENOMEM; + + retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + cmd, + USB_DIR_OUT | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, + 0, 0, data, size, ES2_USB_CTRL_TIMEOUT); + if (retval < 0) + dev_err(&udev->dev, "%s: return error %d\n", __func__, retval); + else + retval = 0; + + kfree(data); + return retval; +} + +static void ap_urb_complete(struct urb *urb) +{ + struct usb_ctrlrequest *dr = urb->context; + + kfree(dr); + usb_free_urb(urb); +} + +static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) +{ + struct usb_device *udev = es2->usb_dev; + struct urb *urb; + struct usb_ctrlrequest *dr; + u8 *buf; + int retval; + + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) + return -ENOMEM; + + dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC); + if (!dr) { + usb_free_urb(urb); + return -ENOMEM; + } + + buf = (u8 *)dr + sizeof(*dr); + memcpy(buf, req, size); + + dr->bRequest = cmd; + dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE; + dr->wValue = 0; + dr->wIndex = 0; + dr->wLength = cpu_to_le16(size); + + usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0), + (unsigned char *)dr, buf, size, + ap_urb_complete, dr); + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) { + usb_free_urb(urb); + kfree(dr); + } + return retval; +} + +static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd, + bool async) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + + if (async) + return output_async(es2, req, size, cmd); + + return output_sync(es2, req, size, cmd); +} + +static int es2_cport_in_enable(struct es2_ap_dev *es2, + struct es2_cport_in *cport_in) +{ + struct urb *urb; + int ret; + int i; + + for (i = 0; i < NUM_CPORT_IN_URB; ++i) { + urb = cport_in->urb[i]; + + ret = usb_submit_urb(urb, GFP_KERNEL); + if (ret) { + dev_err(&es2->usb_dev->dev, + "failed to submit in-urb: %d\n", ret); + goto err_kill_urbs; + } + } + + return 0; + +err_kill_urbs: + for (--i; i >= 0; --i) { + urb = cport_in->urb[i]; + usb_kill_urb(urb); + } + + return ret; +} + +static void es2_cport_in_disable(struct es2_ap_dev *es2, + struct es2_cport_in *cport_in) +{ + struct urb *urb; + int i; + + for (i = 0; i < NUM_CPORT_IN_URB; ++i) { + urb = cport_in->urb[i]; + usb_kill_urb(urb); + } +} + +static int es2_arpc_in_enable(struct es2_ap_dev *es2) +{ + struct urb *urb; + int ret; + int i; + + for (i = 0; i < NUM_ARPC_IN_URB; ++i) { + urb = es2->arpc_urb[i]; + + ret = usb_submit_urb(urb, GFP_KERNEL); + if (ret) { + dev_err(&es2->usb_dev->dev, + "failed to submit arpc in-urb: %d\n", ret); + goto err_kill_urbs; + } + } + + return 0; + +err_kill_urbs: + for (--i; i >= 0; --i) { + urb = es2->arpc_urb[i]; + usb_kill_urb(urb); + } + + return ret; +} + +static void es2_arpc_in_disable(struct es2_ap_dev *es2) +{ + struct urb *urb; + int i; + + for (i = 0; i < NUM_ARPC_IN_URB; ++i) { + urb = es2->arpc_urb[i]; + usb_kill_urb(urb); + } +} + +static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask) +{ + struct urb *urb = NULL; + unsigned long flags; + int i; + + spin_lock_irqsave(&es2->cport_out_urb_lock, flags); + + /* Look in our pool of allocated urbs first, as that's the "fastest" */ + for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { + if (!es2->cport_out_urb_busy[i] && + !es2->cport_out_urb_cancelled[i]) { + es2->cport_out_urb_busy[i] = true; + urb = es2->cport_out_urb[i]; + break; + } + } + spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); + if (urb) + return urb; + + /* + * Crap, pool is empty, complain to the syslog and go allocate one + * dynamically as we have to succeed. + */ + dev_dbg(&es2->usb_dev->dev, + "No free CPort OUT urbs, having to dynamically allocate one!\n"); + return usb_alloc_urb(0, gfp_mask); +} + +static void free_urb(struct es2_ap_dev *es2, struct urb *urb) +{ + unsigned long flags; + int i; + /* + * See if this was an urb in our pool, if so mark it "free", otherwise + * we need to free it ourselves. + */ + spin_lock_irqsave(&es2->cport_out_urb_lock, flags); + for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { + if (urb == es2->cport_out_urb[i]) { + es2->cport_out_urb_busy[i] = false; + urb = NULL; + break; + } + } + spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); + + /* If urb is not NULL, then we need to free this urb */ + usb_free_urb(urb); +} + +/* + * We (ab)use the operation-message header pad bytes to transfer the + * cport id in order to minimise overhead. + */ +static void +gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id) +{ + header->pad[0] = cport_id; +} + +/* Clear the pad bytes used for the CPort id */ +static void gb_message_cport_clear(struct gb_operation_msg_hdr *header) +{ + header->pad[0] = 0; +} + +/* Extract the CPort id packed into the header, and clear it */ +static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header) +{ + u16 cport_id = header->pad[0]; + + gb_message_cport_clear(header); + + return cport_id; +} + +/* + * Returns zero if the message was successfully queued, or a negative errno + * otherwise. + */ +static int message_send(struct gb_host_device *hd, u16 cport_id, + struct gb_message *message, gfp_t gfp_mask) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct usb_device *udev = es2->usb_dev; + size_t buffer_size; + int retval; + struct urb *urb; + unsigned long flags; + + /* + * The data actually transferred will include an indication + * of where the data should be sent. Do one last check of + * the target CPort id before filling it in. + */ + if (!cport_id_valid(hd, cport_id)) { + dev_err(&udev->dev, "invalid cport %u\n", cport_id); + return -EINVAL; + } + + /* Find a free urb */ + urb = next_free_urb(es2, gfp_mask); + if (!urb) + return -ENOMEM; + + spin_lock_irqsave(&es2->cport_out_urb_lock, flags); + message->hcpriv = urb; + spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); + + /* Pack the cport id into the message header */ + gb_message_cport_pack(message->header, cport_id); + + buffer_size = sizeof(*message->header) + message->payload_size; + + usb_fill_bulk_urb(urb, udev, + usb_sndbulkpipe(udev, + es2->cport_out_endpoint), + message->buffer, buffer_size, + cport_out_callback, message); + urb->transfer_flags |= URB_ZERO_PACKET; + + trace_gb_message_submit(message); + + retval = usb_submit_urb(urb, gfp_mask); + if (retval) { + dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval); + + spin_lock_irqsave(&es2->cport_out_urb_lock, flags); + message->hcpriv = NULL; + spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); + + free_urb(es2, urb); + gb_message_cport_clear(message->header); + + return retval; + } + + return 0; +} + +/* + * Can not be called in atomic context. + */ +static void message_cancel(struct gb_message *message) +{ + struct gb_host_device *hd = message->operation->connection->hd; + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct urb *urb; + int i; + + might_sleep(); + + spin_lock_irq(&es2->cport_out_urb_lock); + urb = message->hcpriv; + + /* Prevent dynamically allocated urb from being deallocated. */ + usb_get_urb(urb); + + /* Prevent pre-allocated urb from being reused. */ + for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { + if (urb == es2->cport_out_urb[i]) { + es2->cport_out_urb_cancelled[i] = true; + break; + } + } + spin_unlock_irq(&es2->cport_out_urb_lock); + + usb_kill_urb(urb); + + if (i < NUM_CPORT_OUT_URB) { + spin_lock_irq(&es2->cport_out_urb_lock); + es2->cport_out_urb_cancelled[i] = false; + spin_unlock_irq(&es2->cport_out_urb_lock); + } + + usb_free_urb(urb); +} + +static int es2_cport_allocate(struct gb_host_device *hd, int cport_id, + unsigned long flags) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct ida *id_map = &hd->cport_id_map; + int ida_start, ida_end; + + switch (cport_id) { + case ES2_CPORT_CDSI0: + case ES2_CPORT_CDSI1: + dev_err(&hd->dev, "cport %d not available\n", cport_id); + return -EBUSY; + } + + if (flags & GB_CONNECTION_FLAG_OFFLOADED && + flags & GB_CONNECTION_FLAG_CDSI1) { + if (es2->cdsi1_in_use) { + dev_err(&hd->dev, "CDSI1 already in use\n"); + return -EBUSY; + } + + es2->cdsi1_in_use = true; + + return ES2_CPORT_CDSI1; + } + + if (cport_id < 0) { + ida_start = 0; + ida_end = hd->num_cports; + } else if (cport_id < hd->num_cports) { + ida_start = cport_id; + ida_end = cport_id + 1; + } else { + dev_err(&hd->dev, "cport %d not available\n", cport_id); + return -EINVAL; + } + + return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL); +} + +static void es2_cport_release(struct gb_host_device *hd, u16 cport_id) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + + switch (cport_id) { + case ES2_CPORT_CDSI1: + es2->cdsi1_in_use = false; + return; + } + + ida_simple_remove(&hd->cport_id_map, cport_id); +} + +static int cport_enable(struct gb_host_device *hd, u16 cport_id, + unsigned long flags) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct usb_device *udev = es2->usb_dev; + struct gb_apb_request_cport_flags *req; + u32 connection_flags; + int ret; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + if (!req) + return -ENOMEM; + + connection_flags = 0; + if (flags & GB_CONNECTION_FLAG_CONTROL) + connection_flags |= GB_APB_CPORT_FLAG_CONTROL; + if (flags & GB_CONNECTION_FLAG_HIGH_PRIO) + connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO; + + req->flags = cpu_to_le32(connection_flags); + + dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__, + cport_id, connection_flags); + + ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + GB_APB_REQUEST_CPORT_FLAGS, + USB_DIR_OUT | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, cport_id, 0, + req, sizeof(*req), ES2_USB_CTRL_TIMEOUT); + if (ret != sizeof(*req)) { + dev_err(&udev->dev, "failed to set cport flags for port %d\n", + cport_id); + if (ret >= 0) + ret = -EIO; + + goto out; + } + + ret = 0; +out: + kfree(req); + + return ret; +} + +static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct device *dev = &es2->usb_dev->dev; + struct arpc_cport_connected_req req; + int ret; + + req.cport_id = cpu_to_le16(cport_id); + ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req), + NULL, ES2_ARPC_CPORT_TIMEOUT); + if (ret) { + dev_err(dev, "failed to set connected state for cport %u: %d\n", + cport_id, ret); + return ret; + } + + return 0; +} + +static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct device *dev = &es2->usb_dev->dev; + struct arpc_cport_flush_req req; + int ret; + + req.cport_id = cpu_to_le16(cport_id); + ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req), + NULL, ES2_ARPC_CPORT_TIMEOUT); + if (ret) { + dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret); + return ret; + } + + return 0; +} + +static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id, + u8 phase, unsigned int timeout) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct device *dev = &es2->usb_dev->dev; + struct arpc_cport_shutdown_req req; + int result; + int ret; + + if (timeout > U16_MAX) + return -EINVAL; + + req.cport_id = cpu_to_le16(cport_id); + req.timeout = cpu_to_le16(timeout); + req.phase = phase; + ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req), + &result, ES2_ARPC_CPORT_TIMEOUT + timeout); + if (ret) { + dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n", + cport_id, ret, result); + return ret; + } + + return 0; +} + +static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id, + size_t peer_space, unsigned int timeout) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct device *dev = &es2->usb_dev->dev; + struct arpc_cport_quiesce_req req; + int result; + int ret; + + if (peer_space > U16_MAX) + return -EINVAL; + + if (timeout > U16_MAX) + return -EINVAL; + + req.cport_id = cpu_to_le16(cport_id); + req.peer_space = cpu_to_le16(peer_space); + req.timeout = cpu_to_le16(timeout); + ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req), + &result, ES2_ARPC_CPORT_TIMEOUT + timeout); + if (ret) { + dev_err(dev, "failed to quiesce cport %u: %d (%d)\n", + cport_id, ret, result); + return ret; + } + + return 0; +} + +static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id) +{ + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct device *dev = &es2->usb_dev->dev; + struct arpc_cport_clear_req req; + int ret; + + req.cport_id = cpu_to_le16(cport_id); + ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req), + NULL, ES2_ARPC_CPORT_TIMEOUT); + if (ret) { + dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret); + return ret; + } + + return 0; +} + +static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id) +{ + int retval; + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct usb_device *udev = es2->usb_dev; + + retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + GB_APB_REQUEST_LATENCY_TAG_EN, + USB_DIR_OUT | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, cport_id, 0, NULL, + 0, ES2_USB_CTRL_TIMEOUT); + + if (retval < 0) + dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n", + cport_id); + return retval; +} + +static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id) +{ + int retval; + struct es2_ap_dev *es2 = hd_to_es2(hd); + struct usb_device *udev = es2->usb_dev; + + retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + GB_APB_REQUEST_LATENCY_TAG_DIS, + USB_DIR_OUT | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, cport_id, 0, NULL, + 0, ES2_USB_CTRL_TIMEOUT); + + if (retval < 0) + dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n", + cport_id); + return retval; +} + +static struct gb_hd_driver es2_driver = { + .hd_priv_size = sizeof(struct es2_ap_dev), + .message_send = message_send, + .message_cancel = message_cancel, + .cport_allocate = es2_cport_allocate, + .cport_release = es2_cport_release, + .cport_enable = cport_enable, + .cport_connected = es2_cport_connected, + .cport_flush = es2_cport_flush, + .cport_shutdown = es2_cport_shutdown, + .cport_quiesce = es2_cport_quiesce, + .cport_clear = es2_cport_clear, + .latency_tag_enable = latency_tag_enable, + .latency_tag_disable = latency_tag_disable, + .output = output, +}; + +/* Common function to report consistent warnings based on URB status */ +static int check_urb_status(struct urb *urb) +{ + struct device *dev = &urb->dev->dev; + int status = urb->status; + + switch (status) { + case 0: + return 0; + + case -EOVERFLOW: + dev_err(dev, "%s: overflow actual length is %d\n", + __func__, urb->actual_length); + /* fall through */ + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + case -EILSEQ: + case -EPROTO: + /* device is gone, stop sending */ + return status; + } + dev_err(dev, "%s: unknown status %d\n", __func__, status); + + return -EAGAIN; +} + +static void es2_destroy(struct es2_ap_dev *es2) +{ + struct usb_device *udev; + struct urb *urb; + int i; + + debugfs_remove(es2->apb_log_enable_dentry); + usb_log_disable(es2); + + /* Tear down everything! */ + for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { + urb = es2->cport_out_urb[i]; + usb_kill_urb(urb); + usb_free_urb(urb); + es2->cport_out_urb[i] = NULL; + es2->cport_out_urb_busy[i] = false; /* just to be anal */ + } + + for (i = 0; i < NUM_ARPC_IN_URB; ++i) { + usb_free_urb(es2->arpc_urb[i]); + kfree(es2->arpc_buffer[i]); + es2->arpc_buffer[i] = NULL; + } + + for (i = 0; i < NUM_CPORT_IN_URB; ++i) { + usb_free_urb(es2->cport_in.urb[i]); + kfree(es2->cport_in.buffer[i]); + es2->cport_in.buffer[i] = NULL; + } + + /* release reserved CDSI0 and CDSI1 cports */ + gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1); + gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0); + + udev = es2->usb_dev; + gb_hd_put(es2->hd); + + usb_put_dev(udev); +} + +static void cport_in_callback(struct urb *urb) +{ + struct gb_host_device *hd = urb->context; + struct device *dev = &urb->dev->dev; + struct gb_operation_msg_hdr *header; + int status = check_urb_status(urb); + int retval; + u16 cport_id; + + if (status) { + if ((status == -EAGAIN) || (status == -EPROTO)) + goto exit; + + /* The urb is being unlinked */ + if (status == -ENOENT || status == -ESHUTDOWN) + return; + + dev_err(dev, "urb cport in error %d (dropped)\n", status); + return; + } + + if (urb->actual_length < sizeof(*header)) { + dev_err(dev, "short message received\n"); + goto exit; + } + + /* Extract the CPort id, which is packed in the message header */ + header = urb->transfer_buffer; + cport_id = gb_message_cport_unpack(header); + + if (cport_id_valid(hd, cport_id)) { + greybus_data_rcvd(hd, cport_id, urb->transfer_buffer, + urb->actual_length); + } else { + dev_err(dev, "invalid cport id %u received\n", cport_id); + } +exit: + /* put our urb back in the request pool */ + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) + dev_err(dev, "failed to resubmit in-urb: %d\n", retval); +} + +static void cport_out_callback(struct urb *urb) +{ + struct gb_message *message = urb->context; + struct gb_host_device *hd = message->operation->connection->hd; + struct es2_ap_dev *es2 = hd_to_es2(hd); + int status = check_urb_status(urb); + unsigned long flags; + + gb_message_cport_clear(message->header); + + spin_lock_irqsave(&es2->cport_out_urb_lock, flags); + message->hcpriv = NULL; + spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); + + /* + * Tell the submitter that the message send (attempt) is + * complete, and report the status. + */ + greybus_message_sent(hd, message, status); + + free_urb(es2, urb); +} + +static struct arpc *arpc_alloc(void *payload, u16 size, u8 type) +{ + struct arpc *rpc; + + if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX) + return NULL; + + rpc = kzalloc(sizeof(*rpc), GFP_KERNEL); + if (!rpc) + return NULL; + + INIT_LIST_HEAD(&rpc->list); + rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL); + if (!rpc->req) + goto err_free_rpc; + + rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL); + if (!rpc->resp) + goto err_free_req; + + rpc->req->type = type; + rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size); + memcpy(rpc->req->data, payload, size); + + init_completion(&rpc->response_received); + + return rpc; + +err_free_req: + kfree(rpc->req); +err_free_rpc: + kfree(rpc); + + return NULL; +} + +static void arpc_free(struct arpc *rpc) +{ + kfree(rpc->req); + kfree(rpc->resp); + kfree(rpc); +} + +static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id) +{ + struct arpc *rpc; + + list_for_each_entry(rpc, &es2->arpcs, list) { + if (rpc->req->id == id) + return rpc; + } + + return NULL; +} + +static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc) +{ + rpc->active = true; + rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++); + list_add_tail(&rpc->list, &es2->arpcs); +} + +static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc) +{ + if (rpc->active) { + rpc->active = false; + list_del(&rpc->list); + } +} + +static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout) +{ + struct usb_device *udev = es2->usb_dev; + int retval; + + retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + GB_APB_REQUEST_ARPC_RUN, + USB_DIR_OUT | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, + 0, 0, + rpc->req, le16_to_cpu(rpc->req->size), + ES2_USB_CTRL_TIMEOUT); + if (retval != le16_to_cpu(rpc->req->size)) { + dev_err(&udev->dev, + "failed to send ARPC request %d: %d\n", + rpc->req->type, retval); + if (retval > 0) + retval = -EIO; + return retval; + } + + return 0; +} + +static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, + size_t size, int *result, unsigned int timeout) +{ + struct arpc *rpc; + unsigned long flags; + int retval; + + if (result) + *result = 0; + + rpc = arpc_alloc(payload, size, type); + if (!rpc) + return -ENOMEM; + + spin_lock_irqsave(&es2->arpc_lock, flags); + arpc_add(es2, rpc); + spin_unlock_irqrestore(&es2->arpc_lock, flags); + + retval = arpc_send(es2, rpc, timeout); + if (retval) + goto out_arpc_del; + + retval = wait_for_completion_interruptible_timeout( + &rpc->response_received, + msecs_to_jiffies(timeout)); + if (retval <= 0) { + if (!retval) + retval = -ETIMEDOUT; + goto out_arpc_del; + } + + if (rpc->resp->result) { + retval = -EREMOTEIO; + if (result) + *result = rpc->resp->result; + } else { + retval = 0; + } + +out_arpc_del: + spin_lock_irqsave(&es2->arpc_lock, flags); + arpc_del(es2, rpc); + spin_unlock_irqrestore(&es2->arpc_lock, flags); + arpc_free(rpc); + + if (retval < 0 && retval != -EREMOTEIO) { + dev_err(&es2->usb_dev->dev, + "failed to execute ARPC: %d\n", retval); + } + + return retval; +} + +static void arpc_in_callback(struct urb *urb) +{ + struct es2_ap_dev *es2 = urb->context; + struct device *dev = &urb->dev->dev; + int status = check_urb_status(urb); + struct arpc *rpc; + struct arpc_response_message *resp; + unsigned long flags; + int retval; + + if (status) { + if ((status == -EAGAIN) || (status == -EPROTO)) + goto exit; + + /* The urb is being unlinked */ + if (status == -ENOENT || status == -ESHUTDOWN) + return; + + dev_err(dev, "arpc in-urb error %d (dropped)\n", status); + return; + } + + if (urb->actual_length < sizeof(*resp)) { + dev_err(dev, "short aprc response received\n"); + goto exit; + } + + resp = urb->transfer_buffer; + spin_lock_irqsave(&es2->arpc_lock, flags); + rpc = arpc_find(es2, resp->id); + if (!rpc) { + dev_err(dev, "invalid arpc response id received: %u\n", + le16_to_cpu(resp->id)); + spin_unlock_irqrestore(&es2->arpc_lock, flags); + goto exit; + } + + arpc_del(es2, rpc); + memcpy(rpc->resp, resp, sizeof(*resp)); + complete(&rpc->response_received); + spin_unlock_irqrestore(&es2->arpc_lock, flags); + +exit: + /* put our urb back in the request pool */ + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) + dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval); +} + +#define APB1_LOG_MSG_SIZE 64 +static void apb_log_get(struct es2_ap_dev *es2, char *buf) +{ + int retval; + + do { + retval = usb_control_msg(es2->usb_dev, + usb_rcvctrlpipe(es2->usb_dev, 0), + GB_APB_REQUEST_LOG, + USB_DIR_IN | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, + 0x00, 0x00, + buf, + APB1_LOG_MSG_SIZE, + ES2_USB_CTRL_TIMEOUT); + if (retval > 0) + kfifo_in(&es2->apb_log_fifo, buf, retval); + } while (retval > 0); +} + +static int apb_log_poll(void *data) +{ + struct es2_ap_dev *es2 = data; + char *buf; + + buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + while (!kthread_should_stop()) { + msleep(1000); + apb_log_get(es2, buf); + } + + kfree(buf); + + return 0; +} + +static ssize_t apb_log_read(struct file *f, char __user *buf, + size_t count, loff_t *ppos) +{ + struct es2_ap_dev *es2 = file_inode(f)->i_private; + ssize_t ret; + size_t copied; + char *tmp_buf; + + if (count > APB1_LOG_SIZE) + count = APB1_LOG_SIZE; + + tmp_buf = kmalloc(count, GFP_KERNEL); + if (!tmp_buf) + return -ENOMEM; + + copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count); + ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied); + + kfree(tmp_buf); + + return ret; +} + +static const struct file_operations apb_log_fops = { + .read = apb_log_read, +}; + +static void usb_log_enable(struct es2_ap_dev *es2) +{ + if (!IS_ERR_OR_NULL(es2->apb_log_task)) + return; + + /* get log from APB1 */ + es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log"); + if (IS_ERR(es2->apb_log_task)) + return; + /* XXX We will need to rename this per APB */ + es2->apb_log_dentry = debugfs_create_file("apb_log", 0444, + gb_debugfs_get(), es2, + &apb_log_fops); +} + +static void usb_log_disable(struct es2_ap_dev *es2) +{ + if (IS_ERR_OR_NULL(es2->apb_log_task)) + return; + + debugfs_remove(es2->apb_log_dentry); + es2->apb_log_dentry = NULL; + + kthread_stop(es2->apb_log_task); + es2->apb_log_task = NULL; +} + +static ssize_t apb_log_enable_read(struct file *f, char __user *buf, + size_t count, loff_t *ppos) +{ + struct es2_ap_dev *es2 = file_inode(f)->i_private; + int enable = !IS_ERR_OR_NULL(es2->apb_log_task); + char tmp_buf[3]; + + sprintf(tmp_buf, "%d\n", enable); + return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3); +} + +static ssize_t apb_log_enable_write(struct file *f, const char __user *buf, + size_t count, loff_t *ppos) +{ + int enable; + ssize_t retval; + struct es2_ap_dev *es2 = file_inode(f)->i_private; + + retval = kstrtoint_from_user(buf, count, 10, &enable); + if (retval) + return retval; + + if (enable) + usb_log_enable(es2); + else + usb_log_disable(es2); + + return count; +} + +static const struct file_operations apb_log_enable_fops = { + .read = apb_log_enable_read, + .write = apb_log_enable_write, +}; + +static int apb_get_cport_count(struct usb_device *udev) +{ + int retval; + __le16 *cport_count; + + cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL); + if (!cport_count) + return -ENOMEM; + + retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), + GB_APB_REQUEST_CPORT_COUNT, + USB_DIR_IN | USB_TYPE_VENDOR | + USB_RECIP_INTERFACE, 0, 0, cport_count, + sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT); + if (retval != sizeof(*cport_count)) { + dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", + retval); + + if (retval >= 0) + retval = -EIO; + + goto out; + } + + retval = le16_to_cpu(*cport_count); + + /* We need to fit a CPort ID in one byte of a message header */ + if (retval > U8_MAX) { + retval = U8_MAX; + dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n"); + } + +out: + kfree(cport_count); + return retval; +} + +/* + * The ES2 USB Bridge device has 15 endpoints + * 1 Control - usual USB stuff + AP -> APBridgeA messages + * 7 Bulk IN - CPort data in + * 7 Bulk OUT - CPort data out + */ +static int ap_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + struct es2_ap_dev *es2; + struct gb_host_device *hd; + struct usb_device *udev; + struct usb_host_interface *iface_desc; + struct usb_endpoint_descriptor *endpoint; + __u8 ep_addr; + int retval; + int i; + int num_cports; + bool bulk_out_found = false; + bool bulk_in_found = false; + bool arpc_in_found = false; + + udev = usb_get_dev(interface_to_usbdev(interface)); + + num_cports = apb_get_cport_count(udev); + if (num_cports < 0) { + usb_put_dev(udev); + dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", + num_cports); + return num_cports; + } + + hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX, + num_cports); + if (IS_ERR(hd)) { + usb_put_dev(udev); + return PTR_ERR(hd); + } + + es2 = hd_to_es2(hd); + es2->hd = hd; + es2->usb_intf = interface; + es2->usb_dev = udev; + spin_lock_init(&es2->cport_out_urb_lock); + INIT_KFIFO(es2->apb_log_fifo); + usb_set_intfdata(interface, es2); + + /* + * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated + * dynamically. + */ + retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0); + if (retval) + goto error; + retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1); + if (retval) + goto error; + + /* find all bulk endpoints */ + iface_desc = interface->cur_altsetting; + for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { + endpoint = &iface_desc->endpoint[i].desc; + ep_addr = endpoint->bEndpointAddress; + + if (usb_endpoint_is_bulk_in(endpoint)) { + if (!bulk_in_found) { + es2->cport_in.endpoint = ep_addr; + bulk_in_found = true; + } else if (!arpc_in_found) { + es2->arpc_endpoint_in = ep_addr; + arpc_in_found = true; + } else { + dev_warn(&udev->dev, + "Unused bulk IN endpoint found: 0x%02x\n", + ep_addr); + } + continue; + } + if (usb_endpoint_is_bulk_out(endpoint)) { + if (!bulk_out_found) { + es2->cport_out_endpoint = ep_addr; + bulk_out_found = true; + } else { + dev_warn(&udev->dev, + "Unused bulk OUT endpoint found: 0x%02x\n", + ep_addr); + } + continue; + } + dev_warn(&udev->dev, + "Unknown endpoint type found, address 0x%02x\n", + ep_addr); + } + if (!bulk_in_found || !arpc_in_found || !bulk_out_found) { + dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n"); + retval = -ENODEV; + goto error; + } + + /* Allocate buffers for our cport in messages */ + for (i = 0; i < NUM_CPORT_IN_URB; ++i) { + struct urb *urb; + u8 *buffer; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + retval = -ENOMEM; + goto error; + } + es2->cport_in.urb[i] = urb; + + buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL); + if (!buffer) { + retval = -ENOMEM; + goto error; + } + + usb_fill_bulk_urb(urb, udev, + usb_rcvbulkpipe(udev, es2->cport_in.endpoint), + buffer, ES2_GBUF_MSG_SIZE_MAX, + cport_in_callback, hd); + + es2->cport_in.buffer[i] = buffer; + } + + /* Allocate buffers for ARPC in messages */ + for (i = 0; i < NUM_ARPC_IN_URB; ++i) { + struct urb *urb; + u8 *buffer; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + retval = -ENOMEM; + goto error; + } + es2->arpc_urb[i] = urb; + + buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL); + if (!buffer) { + retval = -ENOMEM; + goto error; + } + + usb_fill_bulk_urb(urb, udev, + usb_rcvbulkpipe(udev, + es2->arpc_endpoint_in), + buffer, ARPC_IN_SIZE_MAX, + arpc_in_callback, es2); + + es2->arpc_buffer[i] = buffer; + } + + /* Allocate urbs for our CPort OUT messages */ + for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { + struct urb *urb; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + retval = -ENOMEM; + goto error; + } + + es2->cport_out_urb[i] = urb; + es2->cport_out_urb_busy[i] = false; /* just to be anal */ + } + + /* XXX We will need to rename this per APB */ + es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable", + 0644, + gb_debugfs_get(), es2, + &apb_log_enable_fops); + + INIT_LIST_HEAD(&es2->arpcs); + spin_lock_init(&es2->arpc_lock); + + retval = es2_arpc_in_enable(es2); + if (retval) + goto error; + + retval = gb_hd_add(hd); + if (retval) + goto err_disable_arpc_in; + + retval = es2_cport_in_enable(es2, &es2->cport_in); + if (retval) + goto err_hd_del; + + return 0; + +err_hd_del: + gb_hd_del(hd); +err_disable_arpc_in: + es2_arpc_in_disable(es2); +error: + es2_destroy(es2); + + return retval; +} + +static void ap_disconnect(struct usb_interface *interface) +{ + struct es2_ap_dev *es2 = usb_get_intfdata(interface); + + gb_hd_del(es2->hd); + + es2_cport_in_disable(es2, &es2->cport_in); + es2_arpc_in_disable(es2); + + es2_destroy(es2); +} + +static struct usb_driver es2_ap_driver = { + .name = "es2_ap_driver", + .probe = ap_probe, + .disconnect = ap_disconnect, + .id_table = id_table, + .soft_unbind = 1, +}; + +module_usb_driver(es2_ap_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |