| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/rpmsg.h> |
| #include <linux/idr.h> |
| #include <linux/sizes.h> |
| #include <linux/delay.h> |
| #include <linux/regmap.h> |
| #include <linux/workqueue.h> |
| #include <linux/list.h> |
| #include <linux/sched.h> |
| #include <linux/kthread.h> |
| #include <linux/component.h> |
| #include <sound/wcd-dsp-mgr.h> |
| #include <sound/wcd-spi.h> |
| #include <linux/ipc_logging.h> |
| |
| #include <linux/rpmsg/qcom_glink.h> |
| |
| #include "rpmsg_internal.h" |
| #include "qcom_glink_native.h" |
| |
| #define GLINK_LOG_PAGE_CNT 2 |
| #define GLINK_INFO(ctxt, x, ...) \ |
| do { \ |
| if (ctxt->ilc) \ |
| ipc_log_string(ctxt->ilc, "[%s]: "x, __func__, ##__VA_ARGS__); \ |
| } while (0) |
| |
| #define CH_INFO(ch, x, ...) \ |
| do { \ |
| if (ch->glink && ch->glink->ilc) \ |
| ipc_log_string(ch->glink->ilc, "%s[%d:%d] %s: "x, ch->name, \ |
| ch->lcid, ch->rcid, __func__, ##__VA_ARGS__); \ |
| } while (0) |
| |
| |
| #define GLINK_ERR(ctxt, x, ...) \ |
| do { \ |
| pr_err_ratelimited("[%s]: "x, __func__, ##__VA_ARGS__); \ |
| if (ctxt->ilc) \ |
| ipc_log_string(ctxt->ilc, "[%s]: "x, __func__, ##__VA_ARGS__); \ |
| } while (0) |
| |
| #define SPI_ALIGNMENT 16 |
| #define FIFO_FULL_RESERVE 8 |
| #define TX_BLOCKED_CMD_RESERVE 16 |
| #define DEFAULT_FIFO_SIZE 1024 |
| #define SHORT_SIZE 16 |
| #define XPRT_ALIGNMENT 4 |
| |
| #define MAX_INACTIVE_CYCLES 50 |
| #define POLL_INTERVAL_US 500 |
| |
| #define ACTIVE_TX BIT(0) |
| #define ACTIVE_RX BIT(1) |
| |
| #define ID_MASK 0xFFFFFF |
| |
| #define GLINK_NAME_SIZE 32 |
| #define GLINK_VERSION_1 1 |
| |
| #define SPI_GLINK_CID_MIN 1 |
| #define SPI_GLINK_CID_MAX 65536 |
| |
| struct glink_msg { |
| __le16 cmd; |
| __le16 param1; |
| __le32 param2; |
| __le32 param3; |
| __le32 param4; |
| u8 data[]; |
| } __packed; |
| |
| /** |
| * struct glink_defer_cmd - deferred incoming control message |
| * @node: list node |
| * @msg: message header |
| * data: payload of the message |
| * |
| * Copy of a received control message, to be added to @rx_queue and processed |
| * by @rx_work of @glink_spi. |
| */ |
| struct glink_defer_cmd { |
| struct list_head node; |
| |
| struct glink_msg msg; |
| u8 data[]; |
| }; |
| |
| /** |
| * struct glink_core_rx_intent - RX intent |
| * RX intent |
| * |
| * @data: pointer to the data (may be NULL for zero-copy) |
| * @id: remote or local intent ID |
| * @size: size of the original intent (do not modify) |
| * @addr: addr to read/write the data from |
| * @reuse: To mark if the intent can be reused after first use |
| * @in_use: To mark if intent is already in use for the channel |
| * @offset: next write offset (initially 0) |
| */ |
| struct glink_core_rx_intent { |
| void *data; |
| u32 id; |
| size_t size; |
| u32 addr; |
| bool reuse; |
| bool in_use; |
| u32 offset; |
| |
| struct list_head node; |
| }; |
| |
| /** |
| * @fifo_base: Base Address of the RX FIFO. |
| * @length: End Address of the RX FIFO. |
| * @tail_addr: Address of the TX FIFO Read Index Register. |
| * @head_addr: Address of the TX FIFO Write Index Register. |
| * @local_addr: Address of the RX FIFO Read Index Register. |
| */ |
| struct glink_spi_pipe { |
| u32 fifo_base; |
| u32 length; |
| |
| u32 tail_addr; |
| u32 head_addr; |
| |
| u32 local_addr; |
| }; |
| |
| /** |
| * struct glink_cmpnt - Component to cache spi component and its operations |
| * @master_dev: Device structure corresponding to spi device. |
| * @master_ops: Operations supported by the spi device. |
| */ |
| struct glink_cmpnt { |
| struct device *master_dev; |
| struct wdsp_mgr_ops *master_ops; |
| }; |
| |
| /** |
| * struct glink_spi - driver context, relates to one remote subsystem |
| * @dev: reference to the associated struct device |
| * @name: name of this edge |
| * @rx_pipe: pipe object for receive FIFO |
| * @tx_pipe: pipe object for transmit FIFO |
| * @rx_work: worker for handling received control messages |
| * @rx_worker: worker struct for handling received control messages |
| * @rx_task: task that runs the rx_worker |
| * @rx_lock: protects the @rx_queue |
| * @rx_queue: queue of received control messages to be processed in @rx_work |
| * @tx_lock: synchronizes operations on the tx fifo |
| * @idr_lock: synchronizes @lcids and @rcids modifications |
| * @lcids: idr of all channels with a known local channel id |
| * @rcids: idr of all channels with a known remote channel id |
| * @spi_ops: spi ops for sending data to the remote |
| * @cmpnt: component to be registered with the wdsp component manager |
| * @in_reset indicates that remote processor is in reset |
| * @ilc: ipc logging context reference |
| */ |
| struct glink_spi { |
| struct device dev; |
| |
| const char *name; |
| |
| struct glink_spi_pipe rx_pipe; |
| struct glink_spi_pipe tx_pipe; |
| |
| struct kthread_work rx_work; |
| struct kthread_worker rx_worker; |
| struct task_struct *rx_task; |
| |
| spinlock_t rx_lock; |
| struct list_head rx_queue; |
| struct work_struct rx_defer_work; |
| |
| struct mutex tx_lock; |
| |
| spinlock_t idr_lock; |
| struct idr lcids; |
| struct idr rcids; |
| u32 features; |
| |
| bool intentless; |
| |
| struct wcd_spi_ops spi_ops; |
| struct glink_cmpnt cmpnt; |
| atomic_t activity_cnt; |
| atomic_t in_reset; |
| |
| void *ilc; |
| }; |
| |
| enum { |
| GLINK_STATE_CLOSED, |
| GLINK_STATE_OPENING, |
| GLINK_STATE_OPEN, |
| GLINK_STATE_CLOSING, |
| }; |
| |
| /** |
| * struct glink_channel - internal representation of a channel |
| * @rpdev: rpdev reference, only used for primary endpoints |
| * @ept: rpmsg endpoint this channel is associated with |
| * @glink: glink_spi context handle |
| * @refcount: refcount for the channel object |
| * @recv_lock: guard for @ept.cb |
| * @name: unique channel name/identifier |
| * @lcid: channel id, in local space |
| * @rcid: channel id, in remote space |
| * @intent_lock: lock for protection of @liids, @riids |
| * @liids: idr of all local intents |
| * @riids: idr of all remote intents |
| * @intent_work: worker responsible for transmitting rx_done packets |
| * @done_intents: list of intents that needs to be announced rx_done |
| * @buf: receive buffer, for gathering fragments |
| * @buf_offset: write offset in @buf |
| * @buf_size: size of current @buf |
| * @open_ack: completed once remote has acked the open-request |
| * @open_req: completed once open-request has been received |
| * @intent_req_lock: Synchronises multiple intent requests |
| * @intent_req_result: Result of intent request |
| * @intent_req_comp: Completion for intent_req signalling |
| */ |
| struct glink_channel { |
| struct rpmsg_endpoint ept; |
| |
| struct rpmsg_device *rpdev; |
| struct glink_spi *glink; |
| |
| struct kref refcount; |
| |
| spinlock_t recv_lock; |
| |
| char *name; |
| unsigned int lcid; |
| unsigned int rcid; |
| |
| spinlock_t intent_lock; |
| struct idr liids; |
| struct idr riids; |
| struct work_struct intent_work; |
| struct list_head done_intents; |
| |
| struct glink_core_rx_intent *buf; |
| int buf_offset; |
| int buf_size; |
| |
| unsigned int lsigs; |
| unsigned int rsigs; |
| |
| struct completion open_ack; |
| struct completion open_req; |
| |
| struct mutex intent_req_lock; |
| bool intent_req_result; |
| struct completion intent_req_comp; |
| }; |
| |
| #define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept) |
| |
| static const struct rpmsg_endpoint_ops glink_endpoint_ops; |
| |
| #define SPI_CMD_VERSION 0 |
| #define SPI_CMD_VERSION_ACK 1 |
| #define SPI_CMD_OPEN 2 |
| #define SPI_CMD_CLOSE 3 |
| #define SPI_CMD_OPEN_ACK 4 |
| #define SPI_CMD_CLOSE_ACK 5 |
| #define SPI_CMD_INTENT 6 |
| #define SPI_CMD_RX_DONE 7 |
| #define SPI_CMD_RX_DONE_W_REUSE 8 |
| #define SPI_CMD_RX_INTENT_REQ 9 |
| #define SPI_CMD_RX_INTENT_REQ_ACK 10 |
| #define SPI_CMD_TX_DATA 11 |
| #define SPI_CMD_TX_DATA_CONT 12 |
| #define SPI_CMD_READ_NOTIF 13 |
| #define SPI_CMD_SIGNALS 14 |
| #define SPI_CMD_TX_SHORT_DATA 17 |
| |
| static void glink_spi_rx_done_work(struct work_struct *work); |
| static void glink_spi_remove(struct glink_spi *glink); |
| |
| /** |
| * spi_resume() - Vote for the spi device resume |
| * @cmpnt: Component to identify the spi device. |
| * |
| * Return: 0 on success, standard Linux error codes on failure. |
| */ |
| static int spi_resume(struct glink_cmpnt *cmpnt) |
| { |
| if (!cmpnt || !cmpnt->master_dev || !cmpnt->master_ops || |
| !cmpnt->master_ops->resume) |
| return 0; |
| |
| return cmpnt->master_ops->resume(cmpnt->master_dev); |
| } |
| |
| /** |
| * glink_spi_xprt_set_poll_mode() - Set the transport to polling mode |
| * @glink: Edge information corresponding to the transport. |
| * |
| * This helper function indicates the start of RX polling. This will |
| * prevent the system from suspending and keeps polling for RX for a |
| * pre-defined duration. |
| */ |
| static void glink_spi_xprt_set_poll_mode(struct glink_spi *glink) |
| { |
| atomic_inc(&glink->activity_cnt); |
| spi_resume(&glink->cmpnt); |
| } |
| |
| /** |
| * glink_spi_xprt_set_irq_mode() - Set the transport to IRQ mode |
| * @glink: Edge information corresponding to the transport. |
| * |
| * This helper indicates the end of RX polling. This will allow the |
| * system to suspend and new RX data can be handled only through an IRQ. |
| */ |
| static void glink_spi_xprt_set_irq_mode(struct glink_spi *glink) |
| { |
| atomic_dec(&glink->activity_cnt); |
| } |
| |
| static struct glink_channel *glink_spi_alloc_channel(struct glink_spi *glink, |
| const char *name) |
| { |
| struct glink_channel *channel; |
| |
| channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
| if (!channel) |
| return ERR_PTR(-ENOMEM); |
| |
| /* Setup glink internal glink_channel data */ |
| spin_lock_init(&channel->recv_lock); |
| spin_lock_init(&channel->intent_lock); |
| mutex_init(&channel->intent_req_lock); |
| |
| channel->glink = glink; |
| channel->name = kstrdup(name, GFP_KERNEL); |
| |
| init_completion(&channel->open_req); |
| init_completion(&channel->open_ack); |
| init_completion(&channel->intent_req_comp); |
| |
| INIT_LIST_HEAD(&channel->done_intents); |
| INIT_WORK(&channel->intent_work, glink_spi_rx_done_work); |
| |
| idr_init(&channel->liids); |
| idr_init(&channel->riids); |
| kref_init(&channel->refcount); |
| |
| return channel; |
| } |
| |
| static void glink_spi_channel_release(struct kref *ref) |
| { |
| struct glink_channel *channel = container_of(ref, struct glink_channel, |
| refcount); |
| unsigned long flags; |
| |
| CH_INFO(channel, "\n"); |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| idr_destroy(&channel->liids); |
| idr_destroy(&channel->riids); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| kfree(channel->name); |
| kfree(channel); |
| } |
| |
| /** |
| * glink_spi_read() - Receive data over SPI bus |
| * @glink: Edge from which the data has to be received. |
| * @src: Source Address of the RX data. |
| * @dst: Address of the destination RX buffer. |
| * @size: Size of the RX data. |
| * |
| * This function is used to receive data or command as a byte stream from |
| * the remote subsystem over the SPI bus. |
| * |
| * Return: 0 on success, standard Linux error codes on failure. |
| */ |
| static int glink_spi_read(struct glink_spi *glink, u32 src, void *dst, |
| size_t size) |
| { |
| struct wcd_spi_msg spi_msg = { 0 }; |
| |
| if (unlikely(!glink->spi_ops.read_dev)) |
| return -EINVAL; |
| |
| spi_msg.data = dst; |
| spi_msg.remote_addr = src; |
| spi_msg.len = size; |
| return glink->spi_ops.read_dev(glink->spi_ops.spi_dev, &spi_msg); |
| } |
| |
| /** |
| * glink_spi_write() - Transmit data over SPI bus |
| * @glink: Edge from which the data has to be received. |
| * @src: Address of the TX buffer. |
| * @dst: Destination Address of the TX Data. |
| * @size: Size of the TX data. |
| * |
| * This function is used to transmit data or command as a byte stream to |
| * the remote subsystem over the SPI bus. |
| * |
| * Return: 0 on success, standard Linux error codes on failure. |
| */ |
| static int glink_spi_write(struct glink_spi *glink, void *src, u32 dst, |
| size_t size) |
| { |
| struct wcd_spi_msg spi_msg = { 0 }; |
| |
| if (unlikely(!glink->spi_ops.write_dev)) |
| return -EINVAL; |
| |
| spi_msg.data = src; |
| spi_msg.remote_addr = dst; |
| spi_msg.len = size; |
| return glink->spi_ops.write_dev(glink->spi_ops.spi_dev, &spi_msg); |
| } |
| |
| /** |
| * glink_spi_reg_read() - Read the TX/RX FIFO Read/Write Index registers |
| * @glink: Edge from which the registers have to be read. |
| * @reg_addr: Address of the register to be read. |
| * @data: Buffer into which the register data has to be read. |
| * |
| * Return: 0 on success, standard Linux error codes on failure. |
| */ |
| static int glink_spi_reg_read(struct glink_spi *glink, u32 reg_addr, u32 *data) |
| { |
| int ret; |
| |
| ret = glink_spi_read(glink, reg_addr, data, sizeof(*data)); |
| if (ret) |
| return ret; |
| |
| /* SPI register reads need to be masked */ |
| *data = *data & ID_MASK; |
| return 0; |
| } |
| |
| /** |
| * glink_spi_reg_write() - Write the TX/RX FIFO Read/Write Index registers |
| * @glink: Edge to which the registers have to be written. |
| * @reg_addr: Address of the registers to be written. |
| * @data: Data to be written to the registers. |
| * |
| * Return: 0 on success, standard Linux error codes on failure. |
| */ |
| static int glink_spi_reg_write(struct glink_spi *glink, u32 reg_addr, u32 data) |
| { |
| return glink_spi_write(glink, &data, reg_addr, sizeof(data)); |
| } |
| |
| static size_t glink_spi_rx_avail(struct glink_spi *glink) |
| { |
| struct glink_spi_pipe *pipe = &glink->rx_pipe; |
| u32 head; |
| u32 tail; |
| int ret; |
| |
| if (atomic_read(&glink->in_reset)) |
| return 0; |
| |
| if (unlikely(!pipe->fifo_base)) { |
| ret = glink_spi_reg_read(glink, pipe->tail_addr, |
| &pipe->local_addr); |
| if (ret < 0) { |
| GLINK_ERR(glink, "Error %d reading rx tail\n", ret); |
| return 0; |
| } |
| pipe->fifo_base = pipe->local_addr; |
| } |
| |
| tail = pipe->local_addr; |
| ret = glink_spi_reg_read(glink, pipe->head_addr, &head); |
| if (ret < 0) { |
| GLINK_ERR(glink, "Error %d reading rx head\n", ret); |
| return 0; |
| } |
| |
| if (head < tail) |
| return pipe->length - (tail - head); |
| else |
| return head - tail; |
| } |
| |
| static void glink_spi_rx_peak(struct glink_spi *glink, |
| void *data, unsigned int offset, size_t count) |
| { |
| struct glink_spi_pipe *pipe = &glink->rx_pipe; |
| u32 fifo_end; |
| size_t len; |
| u32 tail; |
| |
| fifo_end = pipe->fifo_base + pipe->length; |
| tail = pipe->local_addr; |
| tail += offset; |
| if (tail >= fifo_end) |
| tail -= pipe->length; |
| |
| len = min_t(size_t, count, fifo_end - tail); |
| if (len) |
| glink_spi_read(glink, tail, data, len); |
| |
| if (len != count) |
| glink_spi_read(glink, pipe->fifo_base, data + len, count - len); |
| } |
| |
| static void glink_spi_rx_advance(struct glink_spi *glink, size_t count) |
| { |
| struct glink_spi_pipe *pipe = &glink->rx_pipe; |
| u32 tail; |
| int ret; |
| |
| tail = pipe->local_addr; |
| tail += count; |
| |
| if (tail >= pipe->fifo_base + pipe->length) |
| tail -= pipe->length; |
| |
| pipe->local_addr = tail; |
| ret = glink_spi_reg_write(glink, pipe->tail_addr, tail); |
| if (ret) |
| GLINK_ERR(glink, "Error writing rx tail\n"); |
| } |
| |
| static size_t glink_spi_tx_avail(struct glink_spi *glink) |
| { |
| struct glink_spi_pipe *pipe = &glink->tx_pipe; |
| u32 avail; |
| u32 head; |
| u32 tail; |
| int ret; |
| |
| if (atomic_read(&glink->in_reset)) |
| return 0; |
| |
| if (unlikely(!pipe->fifo_base)) { |
| ret = glink_spi_reg_read(glink, pipe->head_addr, |
| &pipe->local_addr); |
| if (ret < 0) { |
| GLINK_ERR(glink, "Error %d reading tx head\n", ret); |
| return 0; |
| } |
| pipe->fifo_base = pipe->local_addr; |
| } |
| |
| head = pipe->local_addr; |
| ret = glink_spi_reg_read(glink, pipe->tail_addr, &tail); |
| if (ret < 0) { |
| GLINK_ERR(glink, "Error %d reading tx tail\n", ret); |
| return 0; |
| } |
| |
| if (tail <= head) |
| avail = pipe->fifo_base + pipe->length - head + tail; |
| else |
| avail = tail - head; |
| |
| if (avail < (FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE)) |
| avail = 0; |
| else |
| avail -= FIFO_FULL_RESERVE + TX_BLOCKED_CMD_RESERVE; |
| |
| return avail; |
| } |
| |
| static unsigned int glink_spi_tx_write_one(struct glink_spi *glink, u32 head, |
| void *data, size_t count) |
| { |
| struct glink_spi_pipe *pipe = &glink->tx_pipe; |
| size_t len; |
| int ret; |
| |
| len = min_t(size_t, count, pipe->fifo_base + pipe->length - head); |
| if (len) { |
| ret = glink_spi_write(glink, data, head, len); |
| if (ret) |
| GLINK_ERR(glink, "Error %d writing tx data\n", ret); |
| } |
| |
| if (len != count) { |
| ret = glink_spi_write(glink, data + len, pipe->fifo_base, |
| count - len); |
| if (ret) |
| GLINK_ERR(glink, "Error %d writing tx data\n", ret); |
| } |
| |
| head += count; |
| if (head >= pipe->fifo_base + pipe->length) |
| head -= pipe->length; |
| |
| return head; |
| } |
| |
| static void glink_spi_tx_write(struct glink_spi *glink, void *hdr, size_t hlen, |
| void *data, size_t dlen) |
| { |
| struct glink_spi_pipe *pipe = &glink->tx_pipe; |
| u32 head; |
| int ret; |
| |
| head = pipe->local_addr; |
| |
| if (hlen) |
| head = glink_spi_tx_write_one(glink, head, hdr, hlen); |
| if (dlen) |
| head = glink_spi_tx_write_one(glink, head, data, dlen); |
| |
| /* Ensure head is always aligned to 8 bytes */ |
| head = ALIGN(head, SPI_ALIGNMENT); |
| if (head >= pipe->fifo_base + pipe->length) |
| head -= pipe->length; |
| |
| pipe->local_addr = head; |
| ret = glink_spi_reg_write(glink, pipe->head_addr, head); |
| if (ret) |
| GLINK_ERR(glink, "Error %d writing tx head\n", ret); |
| |
| } |
| |
| static int glink_spi_tx(struct glink_spi *glink, void *hdr, size_t hlen, |
| void *data, size_t dlen, bool wait) |
| { |
| unsigned int tlen = hlen + dlen; |
| int ret = 0; |
| |
| if (tlen >= glink->tx_pipe.length) |
| return -EINVAL; |
| |
| mutex_lock(&glink->tx_lock); |
| |
| while (glink_spi_tx_avail(glink) < tlen) { |
| if (!wait) { |
| ret = -EAGAIN; |
| goto out; |
| } |
| |
| if (atomic_read(&glink->in_reset)) { |
| ret = -ENXIO; |
| goto out; |
| } |
| |
| /* Wait without holding the tx_lock */ |
| mutex_unlock(&glink->tx_lock); |
| |
| usleep_range(10000, 15000); |
| |
| mutex_lock(&glink->tx_lock); |
| } |
| |
| glink_spi_tx_write(glink, hdr, hlen, data, dlen); |
| |
| out: |
| mutex_unlock(&glink->tx_lock); |
| |
| |
| return ret; |
| } |
| |
| static int glink_spi_send_version(struct glink_spi *glink) |
| { |
| struct glink_msg msg = { 0 }; |
| |
| msg.cmd = cpu_to_le16(SPI_CMD_VERSION); |
| msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
| msg.param2 = cpu_to_le32(glink->features); |
| |
| GLINK_INFO(glink, "vers:%d features:%d\n", msg.param1, msg.param2); |
| return glink_spi_tx(glink, &msg, sizeof(msg), NULL, 0, true); |
| } |
| |
| static void glink_spi_send_version_ack(struct glink_spi *glink) |
| { |
| struct glink_msg msg = { 0 }; |
| |
| msg.cmd = cpu_to_le16(SPI_CMD_VERSION_ACK); |
| msg.param1 = cpu_to_le16(GLINK_VERSION_1); |
| msg.param2 = cpu_to_le32(glink->features); |
| |
| GLINK_INFO(glink, "vers:%d features:%d\n", msg.param1, msg.param2); |
| glink_spi_tx(glink, &msg, sizeof(msg), NULL, 0, true); |
| } |
| |
| /** |
| * glink_spi_receive_version() - receive version/features from remote system |
| * |
| * @glink: pointer to transport interface |
| * @r_version: remote version |
| * @r_features: remote features |
| * |
| * This function is called in response to a remote-initiated version/feature |
| * negotiation sequence. |
| */ |
| static void glink_spi_receive_version(struct glink_spi *glink, |
| u32 version, |
| u32 features) |
| { |
| GLINK_INFO(glink, "vers:%d features:%d\n", version, features); |
| |
| switch (version) { |
| case 0: |
| break; |
| case GLINK_VERSION_1: |
| glink->features &= features; |
| /* FALLTHROUGH */ |
| default: |
| glink_spi_send_version_ack(glink); |
| break; |
| } |
| } |
| |
| /** |
| * glink_spi_receive_version_ack() - receive negotiation ack from remote system |
| * |
| * @glink: pointer to transport interface |
| * @r_version: remote version response |
| * @r_features: remote features response |
| * |
| * This function is called in response to a local-initiated version/feature |
| * negotiation sequence and is the counter-offer from the remote side based |
| * upon the initial version and feature set requested. |
| */ |
| static void glink_spi_receive_version_ack(struct glink_spi *glink, |
| u32 version, |
| u32 features) |
| { |
| GLINK_INFO(glink, "vers:%d features:%d\n", version, features); |
| |
| switch (version) { |
| case 0: |
| /* Version negotiation failed */ |
| break; |
| case GLINK_VERSION_1: |
| if (features == glink->features) |
| break; |
| |
| glink->features &= features; |
| /* FALLTHROUGH */ |
| default: |
| glink_spi_send_version(glink); |
| break; |
| } |
| } |
| |
| /** |
| * glink_spi_send_open_req() - send a SPI_CMD_OPEN request to the remote |
| * @glink: Ptr to the glink edge |
| * @channel: Ptr to the channel that the open req is sent |
| * |
| * Allocates a local channel id and sends a SPI_CMD_OPEN message to the remote. |
| * Will return with refcount held, regardless of outcome. |
| * |
| * Returns 0 on success, negative errno otherwise. |
| */ |
| static int glink_spi_send_open_req(struct glink_spi *glink, |
| struct glink_channel *channel) |
| { |
| |
| struct cmd_msg { |
| __le16 cmd; |
| __le16 lcid; |
| __le16 length; |
| __le16 req_xprt; |
| __le64 reserved; |
| }; |
| struct { |
| struct cmd_msg msg; |
| u8 name[GLINK_NAME_SIZE]; |
| } __packed req; |
| int name_len = strlen(channel->name) + 1; |
| int req_len = ALIGN(sizeof(req.msg) + name_len, SPI_ALIGNMENT); |
| int ret; |
| unsigned long flags; |
| |
| kref_get(&channel->refcount); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| ret = idr_alloc_cyclic(&glink->lcids, channel, |
| SPI_GLINK_CID_MIN, SPI_GLINK_CID_MAX, |
| GFP_ATOMIC); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (ret < 0) |
| return ret; |
| |
| channel->lcid = ret; |
| CH_INFO(channel, "\n"); |
| |
| memset(&req, 0, sizeof(req)); |
| req.msg.cmd = cpu_to_le16(SPI_CMD_OPEN); |
| req.msg.lcid = cpu_to_le16(channel->lcid); |
| req.msg.length = cpu_to_le16(name_len); |
| strlcpy(req.name, channel->name, GLINK_NAME_SIZE); |
| |
| ret = glink_spi_tx(glink, &req, req_len, NULL, 0, true); |
| if (ret) |
| goto remove_idr; |
| |
| return 0; |
| |
| remove_idr: |
| CH_INFO(channel, "remove_idr\n"); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->lcids, channel->lcid); |
| channel->lcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| return ret; |
| } |
| |
| static void glink_spi_send_open_ack(struct glink_spi *glink, |
| struct glink_channel *channel) |
| { |
| struct glink_msg msg = { 0 }; |
| |
| msg.cmd = cpu_to_le16(SPI_CMD_OPEN_ACK); |
| msg.param1 = cpu_to_le16(channel->rcid); |
| |
| CH_INFO(channel, "\n"); |
| glink_spi_tx(glink, &msg, sizeof(msg), NULL, 0, true); |
| } |
| |
| static int glink_spi_rx_open_ack(struct glink_spi *glink, unsigned int lcid) |
| { |
| struct glink_channel *channel; |
| |
| spin_lock(&glink->idr_lock); |
| channel = idr_find(&glink->lcids, lcid); |
| spin_unlock(&glink->idr_lock); |
| if (!channel) { |
| GLINK_ERR(glink, "Invalid open ack packet %d\n", lcid); |
| return -EINVAL; |
| } |
| |
| CH_INFO(channel, "\n"); |
| complete_all(&channel->open_ack); |
| |
| return 0; |
| } |
| |
| static void glink_spi_send_close_req(struct glink_spi *glink, |
| struct glink_channel *channel) |
| { |
| struct glink_msg req = { 0 }; |
| |
| req.cmd = cpu_to_le16(SPI_CMD_CLOSE); |
| req.param1 = cpu_to_le16(channel->lcid); |
| |
| CH_INFO(channel, "\n"); |
| glink_spi_tx(glink, &req, sizeof(req), NULL, 0, true); |
| } |
| |
| static void glink_spi_send_close_ack(struct glink_spi *glink, |
| unsigned int rcid) |
| { |
| struct glink_msg req = { 0 }; |
| |
| req.cmd = cpu_to_le16(SPI_CMD_CLOSE_ACK); |
| req.param1 = cpu_to_le16(rcid); |
| |
| GLINK_INFO(glink, "rcid:%d\n", rcid); |
| glink_spi_tx(glink, &req, sizeof(req), NULL, 0, true); |
| } |
| |
| static int glink_spi_request_intent(struct glink_spi *glink, |
| struct glink_channel *channel, |
| size_t size) |
| { |
| struct glink_msg req = { 0 }; |
| int ret; |
| |
| mutex_lock(&channel->intent_req_lock); |
| |
| reinit_completion(&channel->intent_req_comp); |
| |
| req.cmd = cpu_to_le16(SPI_CMD_RX_INTENT_REQ); |
| req.param1 = cpu_to_le16(channel->lcid); |
| req.param2 = cpu_to_le32(size); |
| |
| CH_INFO(channel, "size:%zd\n", size); |
| |
| ret = glink_spi_tx(glink, &req, sizeof(req), NULL, 0, true); |
| if (ret) |
| goto unlock; |
| |
| ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ); |
| if (!ret) { |
| dev_err(&glink->dev, "intent request timed out\n"); |
| ret = -ETIMEDOUT; |
| } else { |
| ret = channel->intent_req_result ? 0 : -ECANCELED; |
| } |
| |
| unlock: |
| mutex_unlock(&channel->intent_req_lock); |
| return ret; |
| } |
| |
| static int glink_spi_handle_intent(struct glink_spi *glink, |
| unsigned int cid, |
| unsigned int count, |
| void *rx_data, |
| size_t avail) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| struct intent_pair { |
| __le32 size; |
| __le32 iid; |
| __le64 addr; |
| }; |
| struct intent_pair *intents; |
| const size_t msglen = sizeof(struct intent_pair) * count; |
| int ret; |
| int i; |
| unsigned long flags; |
| |
| if (avail < msglen) { |
| dev_err(&glink->dev, "Not enough data in buf\n"); |
| return avail; |
| } |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(&glink->dev, "intents for non-existing channel\n"); |
| return msglen; |
| } |
| |
| intents = (struct intent_pair *)rx_data; |
| for (i = 0; i < count; ++i) { |
| intent = kzalloc(sizeof(*intent), GFP_ATOMIC); |
| if (!intent) |
| break; |
| |
| intent->id = le32_to_cpu(intents[i].iid); |
| intent->size = le32_to_cpu(intents[i].size); |
| intent->addr = (u32)le64_to_cpu(intents[i].addr); |
| |
| CH_INFO(channel, "riid:%d size:%zd\n", intent->id, |
| intent->size); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| ret = idr_alloc(&channel->riids, intent, |
| intent->id, intent->id + 1, GFP_ATOMIC); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| if (ret < 0) |
| dev_err(&glink->dev, "failed to store remote intent\n"); |
| } |
| |
| return msglen; |
| } |
| |
| static void glink_spi_handle_intent_req_ack(struct glink_spi *glink, |
| unsigned int cid, bool granted) |
| { |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(&glink->dev, "unable to find channel\n"); |
| return; |
| } |
| |
| channel->intent_req_result = granted; |
| complete(&channel->intent_req_comp); |
| CH_INFO(channel, "\n"); |
| } |
| |
| /** |
| * glink_spi_send_intent_req_ack() - convert an rx intent request ack cmd to |
| wire format and transmit |
| * @glink: The transport to transmit on. |
| * @channel: The glink channel |
| * @granted: The request response to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int glink_spi_send_intent_req_ack(struct glink_spi *glink, |
| struct glink_channel *channel, |
| bool granted) |
| { |
| struct glink_msg msg = { 0 }; |
| |
| msg.cmd = cpu_to_le16(SPI_CMD_RX_INTENT_REQ_ACK); |
| msg.param1 = cpu_to_le16(channel->lcid); |
| msg.param2 = cpu_to_le32(granted); |
| |
| CH_INFO(channel, "\n"); |
| glink_spi_tx(glink, &msg, sizeof(msg), NULL, 0, true); |
| |
| return 0; |
| } |
| |
| static struct glink_core_rx_intent * |
| glink_spi_alloc_intent(struct glink_spi *glink, |
| struct glink_channel *channel, |
| size_t size, |
| bool reuseable) |
| { |
| struct glink_core_rx_intent *intent; |
| int ret; |
| unsigned long flags; |
| |
| intent = kzalloc(sizeof(*intent), GFP_KERNEL); |
| if (!intent) |
| return NULL; |
| |
| intent->data = kzalloc(size, GFP_KERNEL); |
| if (!intent->data) |
| goto free_intent; |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC); |
| if (ret < 0) { |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| goto free_data; |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| intent->id = ret; |
| intent->size = size; |
| intent->reuse = reuseable; |
| |
| return intent; |
| |
| free_data: |
| kfree(intent->data); |
| free_intent: |
| kfree(intent); |
| return NULL; |
| } |
| |
| /** |
| * glink_spi_advertise_intent - convert an rx intent cmd to wire format and |
| * transmit |
| * @glink: The transport to transmit on. |
| * @channel: The local channel |
| * @size: The intent to pass on to remote. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int glink_spi_advertise_intent(struct glink_spi *glink, |
| struct glink_channel *channel, |
| struct glink_core_rx_intent *intent) |
| { |
| struct command { |
| struct glink_msg msg; |
| __le32 size; |
| __le32 liid; |
| __le64 addr; |
| } __packed; |
| struct command cmd; |
| |
| memset(&cmd, 0, sizeof(cmd)); |
| cmd.msg.cmd = cpu_to_le16(SPI_CMD_INTENT); |
| cmd.msg.param1 = cpu_to_le16(channel->lcid); |
| cmd.msg.param2 = cpu_to_le32(1); |
| cmd.size = cpu_to_le32(intent->size); |
| cmd.liid = cpu_to_le32(intent->id); |
| |
| CH_INFO(channel, "count:%d size:%zd liid:%d\n", 1, |
| intent->size, intent->id); |
| |
| glink_spi_tx(glink, &cmd, sizeof(cmd), NULL, 0, true); |
| |
| return 0; |
| } |
| |
| /** |
| * glink_spi_handle_intent_req() - Receive a request for rx_intent |
| * from remote side |
| * if_ptr: Pointer to the transport interface |
| * rcid: Remote channel ID |
| * size: size of the intent |
| * |
| * The function searches for the local channel to which the request for |
| * rx_intent has arrived and allocates and notifies the remote back |
| */ |
| static void glink_spi_handle_intent_req(struct glink_spi *glink, |
| u32 cid, size_t size) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| if (!channel) { |
| pr_err("%s channel not found for cid %d\n", __func__, cid); |
| return; |
| } |
| |
| intent = glink_spi_alloc_intent(glink, channel, size, false); |
| if (intent) |
| glink_spi_advertise_intent(glink, channel, intent); |
| |
| glink_spi_send_intent_req_ack(glink, channel, !!intent); |
| } |
| |
| static int glink_spi_send_short(struct glink_channel *channel, |
| void *data, int len, |
| struct glink_core_rx_intent *intent, bool wait) |
| { |
| struct glink_spi *glink = channel->glink; |
| struct { |
| struct glink_msg msg; |
| u8 data[SHORT_SIZE]; |
| } __packed req; |
| |
| CH_INFO(channel, "intent offset:%d len:%d\n", intent->offset, len); |
| |
| req.msg.cmd = cpu_to_le16(SPI_CMD_TX_SHORT_DATA); |
| req.msg.param1 = cpu_to_le16(channel->lcid); |
| req.msg.param2 = cpu_to_le32(intent->id); |
| req.msg.param3 = cpu_to_le32(len); |
| req.msg.param4 = cpu_to_be32(0); |
| memcpy(req.data, data, len); |
| |
| mutex_lock(&glink->tx_lock); |
| while (glink_spi_tx_avail(glink) < sizeof(req)) { |
| if (!wait) { |
| mutex_unlock(&glink->tx_lock); |
| return -EAGAIN; |
| } |
| |
| if (atomic_read(&glink->in_reset)) { |
| mutex_unlock(&glink->tx_lock); |
| return -EINVAL; |
| } |
| |
| /* Wait without holding the tx_lock */ |
| mutex_unlock(&glink->tx_lock); |
| |
| usleep_range(10000, 15000); |
| |
| mutex_lock(&glink->tx_lock); |
| } |
| glink_spi_tx_write(glink, &req, sizeof(req), NULL, 0); |
| |
| mutex_unlock(&glink->tx_lock); |
| return 0; |
| } |
| |
| static int glink_spi_send_data(struct glink_channel *channel, |
| void *data, int chunk_size, int left_size, |
| struct glink_core_rx_intent *intent, bool wait) |
| { |
| struct glink_spi *glink = channel->glink; |
| struct { |
| struct glink_msg msg; |
| __le32 chunk_size; |
| __le32 left_size; |
| } __packed req; |
| |
| CH_INFO(channel, "chunk:%d, left:%d\n", chunk_size, left_size); |
| |
| memset(&req, 0, sizeof(req)); |
| if (intent->offset) |
| req.msg.cmd = cpu_to_le16(SPI_CMD_TX_DATA_CONT); |
| else |
| req.msg.cmd = cpu_to_le16(SPI_CMD_TX_DATA); |
| |
| req.msg.param1 = cpu_to_le16(channel->lcid); |
| req.msg.param2 = cpu_to_le32(intent->id); |
| req.chunk_size = cpu_to_le32(chunk_size); |
| req.left_size = cpu_to_le32(left_size); |
| |
| mutex_lock(&glink->tx_lock); |
| while (glink_spi_tx_avail(glink) < sizeof(req)) { |
| if (!wait) { |
| mutex_unlock(&glink->tx_lock); |
| return -EAGAIN; |
| } |
| |
| if (atomic_read(&glink->in_reset)) { |
| mutex_unlock(&glink->tx_lock); |
| return -EINVAL; |
| } |
| |
| /* Wait without holding the tx_lock */ |
| mutex_unlock(&glink->tx_lock); |
| |
| usleep_range(10000, 15000); |
| |
| mutex_lock(&glink->tx_lock); |
| } |
| glink_spi_write(glink, data, intent->addr + intent->offset, chunk_size); |
| intent->offset += chunk_size; |
| glink_spi_tx_write(glink, &req, sizeof(req), NULL, 0); |
| |
| mutex_unlock(&glink->tx_lock); |
| return 0; |
| } |
| |
| static int __glink_spi_send(struct glink_channel *channel, |
| void *data, int len, bool wait) |
| { |
| struct glink_spi *glink = channel->glink; |
| struct glink_core_rx_intent *intent = NULL; |
| struct glink_core_rx_intent *tmp; |
| int size = len; |
| int iid = 0; |
| int ret = 0; |
| unsigned long flags; |
| |
| CH_INFO(channel, "size:%d, wait:%d\n", len, wait); |
| |
| atomic_inc(&glink->activity_cnt); |
| spi_resume(&glink->cmpnt); |
| while (!intent) { |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| idr_for_each_entry(&channel->riids, tmp, iid) { |
| if (tmp->size >= len && !tmp->in_use) { |
| if (!intent) |
| intent = tmp; |
| else if (intent->size > tmp->size) |
| intent = tmp; |
| if (intent->size == len) |
| break; |
| } |
| } |
| if (intent) |
| intent->in_use = true; |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| /* We found an available intent */ |
| if (intent) |
| break; |
| |
| if (!wait) { |
| ret = -EBUSY; |
| goto tx_exit; |
| } |
| |
| ret = glink_spi_request_intent(glink, channel, len); |
| if (ret < 0) |
| goto tx_exit; |
| } |
| |
| if (len <= SHORT_SIZE) |
| size = 0; |
| else if (size & (XPRT_ALIGNMENT - 1)) |
| size = ALIGN(len - SHORT_SIZE, XPRT_ALIGNMENT); |
| |
| if (size) { |
| ret = glink_spi_send_data(channel, data, size, len - size, |
| intent, wait); |
| if (ret) |
| goto tx_exit; |
| } |
| |
| data = (char *)data + size; |
| size = len - size; |
| if (size) |
| ret = glink_spi_send_short(channel, data, size, intent, wait); |
| |
| tx_exit: |
| /* Mark intent available if we failed */ |
| if (ret && intent) |
| intent->in_use = false; |
| |
| atomic_dec(&glink->activity_cnt); |
| |
| return ret; |
| } |
| |
| static void glink_spi_handle_rx_done(struct glink_spi *glink, |
| u32 cid, uint32_t iid, |
| bool reuse) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, cid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(&glink->dev, "invalid channel id received\n"); |
| return; |
| } |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| intent = idr_find(&channel->riids, iid); |
| |
| if (!intent) { |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| dev_err(&glink->dev, "invalid intent id received\n"); |
| return; |
| } |
| |
| intent->offset = 0; |
| intent->in_use = false; |
| CH_INFO(channel, "reuse:%d iid:%d\n", reuse, intent->id); |
| |
| if (!reuse) { |
| idr_remove(&channel->riids, intent->id); |
| kfree(intent); |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| } |
| |
| static int __glink_spi_rx_done(struct glink_spi *glink, |
| struct glink_channel *channel, |
| struct glink_core_rx_intent *intent, |
| bool wait) |
| { |
| struct { |
| u16 id; |
| u16 lcid; |
| u32 liid; |
| u64 reserved; |
| } __packed cmd; |
| unsigned int cid = channel->lcid; |
| unsigned int iid = intent->id; |
| bool reuse = intent->reuse; |
| int ret; |
| |
| cmd.id = reuse ? SPI_CMD_RX_DONE_W_REUSE : SPI_CMD_RX_DONE; |
| cmd.lcid = cid; |
| cmd.liid = iid; |
| |
| ret = glink_spi_tx(glink, &cmd, sizeof(cmd), NULL, 0, wait); |
| if (ret) |
| return ret; |
| |
| intent->offset = 0; |
| if (!reuse) { |
| kfree(intent->data); |
| kfree(intent); |
| } |
| |
| CH_INFO(channel, "reuse:%d liid:%d", reuse, iid); |
| return 0; |
| } |
| |
| static void glink_spi_rx_done_work(struct work_struct *work) |
| { |
| struct glink_channel *channel = container_of(work, struct glink_channel, |
| intent_work); |
| struct glink_spi *glink = channel->glink; |
| struct glink_core_rx_intent *intent, *tmp; |
| unsigned long flags; |
| |
| atomic_inc(&glink->activity_cnt); |
| spi_resume(&glink->cmpnt); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { |
| list_del(&intent->node); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| __glink_spi_rx_done(glink, channel, intent, true); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| } |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| atomic_dec(&glink->activity_cnt); |
| } |
| |
| static void glink_spi_rx_done(struct glink_spi *glink, |
| struct glink_channel *channel, |
| struct glink_core_rx_intent *intent) |
| { |
| unsigned long flags; |
| int ret = -EAGAIN; |
| |
| /* We don't send RX_DONE to intentless systems */ |
| if (glink->intentless) { |
| kfree(intent->data); |
| kfree(intent); |
| return; |
| } |
| |
| /* Take it off the tree of receive intents */ |
| if (!intent->reuse) { |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| idr_remove(&channel->liids, intent->id); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| } |
| |
| /* Schedule the sending of a rx_done indication */ |
| if (list_empty(&channel->done_intents)) |
| ret = __glink_spi_rx_done(glink, channel, intent, false); |
| |
| if (ret) { |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| list_add_tail(&intent->node, &channel->done_intents); |
| schedule_work(&channel->intent_work); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| } |
| } |
| |
| /* Locally initiated rpmsg_create_ept */ |
| static struct glink_channel *glink_spi_create_local(struct glink_spi *glink, |
| const char *name) |
| { |
| struct glink_channel *channel; |
| int ret; |
| unsigned long flags; |
| |
| channel = glink_spi_alloc_channel(glink, name); |
| if (IS_ERR(channel)) |
| return ERR_CAST(channel); |
| |
| CH_INFO(channel, "\n"); |
| ret = glink_spi_send_open_req(glink, channel); |
| if (ret) |
| goto release_channel; |
| |
| ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); |
| if (!ret) |
| goto err_timeout; |
| |
| ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ); |
| if (!ret) |
| goto err_timeout; |
| |
| glink_spi_send_open_ack(glink, channel); |
| |
| return channel; |
| |
| err_timeout: |
| CH_INFO(channel, "err_timeout\n"); |
| |
| /* glink_spi_send_open_req() did register the channel in lcids*/ |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->lcids, channel->lcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| release_channel: |
| CH_INFO(channel, "release_channel\n"); |
| /* Release glink_spi_send_open_req() reference */ |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| /* Release glink_spi_alloc_channel() reference */ |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| |
| return ERR_PTR(-ETIMEDOUT); |
| } |
| |
| /* Remote initiated rpmsg_create_ept */ |
| static int glink_spi_create_remote(struct glink_spi *glink, |
| struct glink_channel *channel) |
| { |
| int ret; |
| |
| CH_INFO(channel, "\n"); |
| |
| glink_spi_send_open_ack(glink, channel); |
| |
| ret = glink_spi_send_open_req(glink, channel); |
| if (ret) |
| goto close_link; |
| |
| ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ); |
| if (!ret) { |
| ret = -ETIMEDOUT; |
| goto close_link; |
| } |
| |
| return 0; |
| |
| close_link: |
| CH_INFO(channel, "close_link %d\n", ret); |
| |
| /* |
| * Send a close request to "undo" our open-ack. The close-ack will |
| * release glink_spi_send_open_req() reference and the last reference |
| * will be release after rx_close or transport unregister by calling |
| * glink_spi_remove(). |
| */ |
| glink_spi_send_close_req(glink, channel); |
| |
| return ret; |
| } |
| |
| static struct rpmsg_endpoint *glink_spi_create_ept(struct rpmsg_device *rpdev, |
| rpmsg_rx_cb_t cb, |
| void *priv, |
| struct rpmsg_channel_info |
| chinfo) |
| { |
| struct glink_channel *parent = to_glink_channel(rpdev->ept); |
| struct glink_channel *channel; |
| struct glink_spi *glink = parent->glink; |
| struct rpmsg_endpoint *ept; |
| const char *name = chinfo.name; |
| int cid; |
| int ret; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_for_each_entry(&glink->rcids, channel, cid) { |
| if (!strcmp(channel->name, name)) |
| break; |
| } |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| if (!channel) { |
| channel = glink_spi_create_local(glink, name); |
| if (IS_ERR(channel)) |
| return NULL; |
| } else { |
| ret = glink_spi_create_remote(glink, channel); |
| if (ret) |
| return NULL; |
| } |
| |
| ept = &channel->ept; |
| ept->rpdev = rpdev; |
| ept->cb = cb; |
| ept->priv = priv; |
| ept->ops = &glink_endpoint_ops; |
| |
| return ept; |
| } |
| |
| static int glink_spi_announce_create(struct rpmsg_device *rpdev) |
| { |
| struct glink_channel *channel = to_glink_channel(rpdev->ept); |
| struct device_node *np = rpdev->dev.of_node; |
| struct glink_spi *glink = channel->glink; |
| struct glink_core_rx_intent *intent; |
| const struct property *prop = NULL; |
| __be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) }; |
| int num_intents; |
| int num_groups = 1; |
| __be32 *val = defaults; |
| int size; |
| |
| if (glink->intentless || !completion_done(&channel->open_ack)) |
| return 0; |
| |
| prop = of_find_property(np, "qcom,intents", NULL); |
| if (prop) { |
| val = prop->value; |
| num_groups = prop->length / sizeof(u32) / 2; |
| } |
| |
| /* Channel is now open, advertise base set of intents */ |
| while (num_groups--) { |
| size = be32_to_cpup(val++); |
| num_intents = be32_to_cpup(val++); |
| while (num_intents--) { |
| intent = glink_spi_alloc_intent(glink, channel, size, |
| true); |
| if (!intent) |
| break; |
| |
| glink_spi_advertise_intent(glink, channel, intent); |
| } |
| } |
| return 0; |
| } |
| |
| static void glink_spi_destroy_ept(struct rpmsg_endpoint *ept) |
| { |
| struct glink_channel *channel = to_glink_channel(ept); |
| struct glink_spi *glink = channel->glink; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&channel->recv_lock, flags); |
| channel->ept.cb = NULL; |
| spin_unlock_irqrestore(&channel->recv_lock, flags); |
| |
| /* Decouple the potential rpdev from the channel */ |
| channel->rpdev = NULL; |
| |
| glink_spi_send_close_req(glink, channel); |
| } |
| |
| static void glink_spi_rx_close(struct glink_spi *glink, unsigned int rcid) |
| { |
| struct rpmsg_channel_info chinfo; |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, rcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (WARN(!channel, "close request on unknown channel\n")) |
| return; |
| CH_INFO(channel, "\n"); |
| |
| /* cancel pending rx_done work */ |
| cancel_work_sync(&channel->intent_work); |
| |
| if (channel->rpdev) { |
| strlcpy(chinfo.name, channel->name, sizeof(chinfo.name)); |
| chinfo.src = RPMSG_ADDR_ANY; |
| chinfo.dst = RPMSG_ADDR_ANY; |
| |
| rpmsg_unregister_device(&glink->dev, &chinfo); |
| } |
| |
| glink_spi_send_close_ack(glink, channel->rcid); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->rcids, channel->rcid); |
| channel->rcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| } |
| |
| static void glink_spi_rx_close_ack(struct glink_spi *glink, unsigned int lcid) |
| { |
| struct glink_channel *channel; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->lcids, lcid); |
| if (WARN(!channel, "close ack on unknown channel\n")) { |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| return; |
| } |
| CH_INFO(channel, "\n"); |
| |
| idr_remove(&glink->lcids, channel->lcid); |
| channel->lcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| } |
| |
| static int glink_spi_send(struct rpmsg_endpoint *ept, void *data, int len) |
| { |
| struct glink_channel *channel = to_glink_channel(ept); |
| |
| return __glink_spi_send(channel, data, len, true); |
| } |
| |
| static int glink_spi_trysend(struct rpmsg_endpoint *ept, void *data, int len) |
| { |
| struct glink_channel *channel = to_glink_channel(ept); |
| |
| return __glink_spi_send(channel, data, len, false); |
| } |
| |
| /** |
| * glink_spi_send_signals() - convert a signal cmd to wire format and transmit |
| * @glink: The transport to transmit on. |
| * @channel: The glink channel |
| * @sigs: The signals to encode. |
| * |
| * Return: 0 on success or standard Linux error code. |
| */ |
| static int glink_spi_send_signals(struct glink_spi *glink, |
| struct glink_channel *channel, |
| u32 sigs) |
| { |
| struct glink_msg msg; |
| |
| msg.cmd = cpu_to_le16(SPI_CMD_SIGNALS); |
| msg.param1 = cpu_to_le16(channel->lcid); |
| msg.param2 = cpu_to_le32(sigs); |
| |
| GLINK_INFO(glink, "sigs:%d\n", sigs); |
| return glink_spi_tx(glink, &msg, sizeof(msg), NULL, 0, true); |
| } |
| |
| static int glink_spi_handle_signals(struct glink_spi *glink, |
| unsigned int rcid, unsigned int signals) |
| { |
| struct glink_channel *channel; |
| unsigned long flags; |
| u32 old; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, rcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_err(&glink->dev, "signal for non-existing channel\n"); |
| return -EINVAL; |
| } |
| |
| old = channel->rsigs; |
| channel->rsigs = signals; |
| |
| if (channel->ept.sig_cb) |
| channel->ept.sig_cb(channel->ept.rpdev, old, channel->rsigs); |
| |
| CH_INFO(channel, "old:%d new:%d\n", old, channel->rsigs); |
| |
| return 0; |
| } |
| |
| static int glink_spi_get_sigs(struct rpmsg_endpoint *ept, |
| u32 *lsigs, u32 *rsigs) |
| { |
| struct glink_channel *channel = to_glink_channel(ept); |
| |
| *lsigs = channel->lsigs; |
| *rsigs = channel->rsigs; |
| |
| return 0; |
| } |
| |
| static int glink_spi_set_sigs(struct rpmsg_endpoint *ept, u32 sigs) |
| { |
| struct glink_channel *channel = to_glink_channel(ept); |
| struct glink_spi *glink = channel->glink; |
| |
| channel->lsigs = sigs; |
| |
| return glink_spi_send_signals(glink, channel, sigs); |
| } |
| |
| /* |
| * Finds the device_node for the glink child interested in this channel. |
| */ |
| static struct device_node *glink_spi_match_channel(struct device_node *node, |
| const char *channel) |
| { |
| struct device_node *child; |
| const char *name; |
| const char *key; |
| int ret; |
| |
| for_each_available_child_of_node(node, child) { |
| key = "qcom,glink-channels"; |
| ret = of_property_read_string(child, key, &name); |
| if (ret) |
| continue; |
| |
| if (strcmp(name, channel) == 0) |
| return child; |
| } |
| |
| return NULL; |
| } |
| |
| static const struct rpmsg_device_ops glink_device_ops = { |
| .create_ept = glink_spi_create_ept, |
| .announce_create = glink_spi_announce_create, |
| }; |
| |
| static const struct rpmsg_endpoint_ops glink_endpoint_ops = { |
| .destroy_ept = glink_spi_destroy_ept, |
| .send = glink_spi_send, |
| .trysend = glink_spi_trysend, |
| .get_sigs = glink_spi_get_sigs, |
| .set_sigs = glink_spi_set_sigs, |
| }; |
| |
| static void glink_spi_rpdev_release(struct device *dev) |
| { |
| struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
| struct glink_channel *channel = to_glink_channel(rpdev->ept); |
| |
| channel->rpdev = NULL; |
| kfree(rpdev); |
| } |
| |
| static int glink_spi_rx_open(struct glink_spi *glink, unsigned int rcid, |
| char *name) |
| { |
| struct glink_channel *channel; |
| struct rpmsg_device *rpdev; |
| bool create_device = false; |
| struct device_node *node; |
| int lcid; |
| int ret; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_for_each_entry(&glink->lcids, channel, lcid) { |
| if (!strcmp(channel->name, name)) |
| break; |
| } |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| if (!channel) { |
| channel = glink_spi_alloc_channel(glink, name); |
| if (IS_ERR(channel)) |
| return PTR_ERR(channel); |
| |
| /* The opening dance was initiated by the remote */ |
| create_device = true; |
| } |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC); |
| if (ret < 0) { |
| dev_err(&glink->dev, "Unable to insert channel into rcid list\n"); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| goto free_channel; |
| } |
| channel->rcid = ret; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| complete_all(&channel->open_req); |
| |
| if (create_device) { |
| rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); |
| if (!rpdev) { |
| ret = -ENOMEM; |
| goto rcid_remove; |
| } |
| |
| rpdev->ept = &channel->ept; |
| strlcpy(rpdev->id.name, name, RPMSG_NAME_SIZE); |
| rpdev->src = RPMSG_ADDR_ANY; |
| rpdev->dst = RPMSG_ADDR_ANY; |
| rpdev->ops = &glink_device_ops; |
| |
| node = glink_spi_match_channel(glink->dev.of_node, name); |
| rpdev->dev.of_node = node; |
| rpdev->dev.parent = &glink->dev; |
| rpdev->dev.release = glink_spi_rpdev_release; |
| |
| ret = rpmsg_register_device(rpdev); |
| if (ret) |
| goto free_rpdev; |
| |
| channel->rpdev = rpdev; |
| } |
| CH_INFO(channel, "\n"); |
| |
| return 0; |
| |
| free_rpdev: |
| CH_INFO(channel, "free_rpdev\n"); |
| kfree(rpdev); |
| rcid_remove: |
| CH_INFO(channel, "rcid_remove\n"); |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_remove(&glink->rcids, channel->rcid); |
| channel->rcid = 0; |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| free_channel: |
| CH_INFO(channel, "free_channel\n"); |
| /* Release the reference, iff we took it */ |
| if (create_device) |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| |
| return ret; |
| } |
| |
| static int glink_spi_rx_data(struct glink_spi *glink, |
| unsigned int rcid, unsigned int liid, |
| void *rx_data, size_t avail) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| struct data_desc { |
| __le32 chunk_size; |
| __le32 left_size; |
| __le64 addr; |
| }; |
| struct data_desc *hdr; |
| unsigned int chunk_size; |
| unsigned int left_size; |
| u32 addr; |
| size_t msglen; |
| unsigned long flags; |
| |
| msglen = sizeof(*hdr); |
| if (avail < msglen) { |
| dev_dbg(&glink->dev, "Not enough data in fifo\n"); |
| return avail; |
| } |
| hdr = (struct data_desc *)rx_data; |
| |
| chunk_size = le32_to_cpu(hdr->chunk_size); |
| left_size = le32_to_cpu(hdr->left_size); |
| addr = (u32)le64_to_cpu(hdr->addr); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, rcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_dbg(&glink->dev, "Data on non-existing channel\n"); |
| return msglen; |
| } |
| CH_INFO(channel, "chunk_size:%d left_size:%d\n", chunk_size, left_size); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| intent = idr_find(&channel->liids, liid); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| if (!intent) { |
| dev_err(&glink->dev, |
| "no intent found for channel %s intent %d\n", |
| channel->name, liid); |
| return msglen; |
| } |
| |
| if (intent->size - intent->offset < chunk_size) { |
| dev_err(&glink->dev, "Insufficient space in intent\n"); |
| |
| /* The packet header lied, drop payload */ |
| return msglen; |
| } |
| |
| /* Read message from addr sent by WDSP */ |
| glink_spi_read(glink, addr, intent->data + intent->offset, chunk_size); |
| intent->offset += chunk_size; |
| |
| /* Handle message when no fragments remain to be received */ |
| if (!left_size) { |
| spin_lock_irqsave(&channel->recv_lock, flags); |
| if (channel->ept.cb) { |
| channel->ept.cb(channel->ept.rpdev, |
| intent->data, |
| intent->offset, |
| channel->ept.priv, |
| RPMSG_ADDR_ANY); |
| } |
| spin_unlock_irqrestore(&channel->recv_lock, flags); |
| |
| intent->offset = 0; |
| channel->buf = NULL; |
| |
| glink_spi_rx_done(glink, channel, intent); |
| } |
| return msglen; |
| } |
| |
| static int glink_spi_rx_short_data(struct glink_spi *glink, |
| unsigned int rcid, unsigned int liid, |
| unsigned int chunk_size, |
| unsigned int left_size, |
| void *src, size_t avail) |
| { |
| struct glink_core_rx_intent *intent; |
| struct glink_channel *channel; |
| size_t msglen = SHORT_SIZE; |
| unsigned long flags; |
| |
| if (avail < msglen) { |
| dev_dbg(&glink->dev, "Not enough data in fifo\n"); |
| return avail; |
| } |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| channel = idr_find(&glink->rcids, rcid); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| if (!channel) { |
| dev_dbg(&glink->dev, "Data on non-existing channel\n"); |
| return msglen; |
| } |
| CH_INFO(channel, "chunk_size:%d left_size:%d\n", chunk_size, left_size); |
| |
| spin_lock_irqsave(&channel->intent_lock, flags); |
| intent = idr_find(&channel->liids, liid); |
| spin_unlock_irqrestore(&channel->intent_lock, flags); |
| |
| if (!intent) { |
| dev_err(&glink->dev, |
| "no intent found for channel %s intent %d\n", |
| channel->name, liid); |
| return msglen; |
| } |
| |
| if (intent->size - intent->offset < chunk_size) { |
| dev_err(&glink->dev, "Insufficient space in intent\n"); |
| |
| /* The packet header lied, drop payload */ |
| return msglen; |
| } |
| |
| /* Read message from addr sent by WDSP */ |
| memcpy(intent->data + intent->offset, src, chunk_size); |
| intent->offset += chunk_size; |
| |
| /* Handle message when no fragments remain to be received */ |
| if (!left_size) { |
| spin_lock_irqsave(&channel->recv_lock, flags); |
| if (channel->ept.cb) { |
| channel->ept.cb(channel->ept.rpdev, |
| intent->data, |
| intent->offset, |
| channel->ept.priv, |
| RPMSG_ADDR_ANY); |
| } |
| spin_unlock_irqrestore(&channel->recv_lock, flags); |
| |
| intent->offset = 0; |
| channel->buf = NULL; |
| |
| glink_spi_rx_done(glink, channel, intent); |
| } |
| return msglen; |
| } |
| |
| static void glink_spi_defer_work(struct work_struct *work) |
| { |
| struct glink_spi *glink = container_of(work, struct glink_spi, |
| rx_defer_work); |
| |
| struct glink_defer_cmd *dcmd; |
| struct glink_msg *msg; |
| unsigned long flags; |
| unsigned int param1; |
| unsigned int param2; |
| unsigned int param3; |
| unsigned int param4; |
| unsigned int cmd; |
| |
| atomic_inc(&glink->activity_cnt); |
| spi_resume(&glink->cmpnt); |
| for (;;) { |
| spin_lock_irqsave(&glink->rx_lock, flags); |
| if (list_empty(&glink->rx_queue)) { |
| spin_unlock_irqrestore(&glink->rx_lock, flags); |
| break; |
| } |
| dcmd = list_first_entry(&glink->rx_queue, |
| struct glink_defer_cmd, node); |
| list_del(&dcmd->node); |
| spin_unlock_irqrestore(&glink->rx_lock, flags); |
| |
| msg = &dcmd->msg; |
| cmd = le16_to_cpu(msg->cmd); |
| param1 = le16_to_cpu(msg->param1); |
| param2 = le32_to_cpu(msg->param2); |
| param3 = le32_to_cpu(msg->param3); |
| param4 = le32_to_cpu(msg->param4); |
| |
| switch (cmd) { |
| case SPI_CMD_OPEN: |
| glink_spi_rx_open(glink, param1, msg->data); |
| break; |
| case SPI_CMD_CLOSE: |
| glink_spi_rx_close(glink, param1); |
| break; |
| case SPI_CMD_CLOSE_ACK: |
| glink_spi_rx_close_ack(glink, param1); |
| break; |
| default: |
| WARN(1, "Unknown defer object %d\n", cmd); |
| break; |
| } |
| |
| kfree(dcmd); |
| } |
| atomic_dec(&glink->activity_cnt); |
| } |
| |
| static int glink_spi_rx_defer(struct glink_spi *glink, |
| void *rx_data, u32 rx_avail, size_t extra) |
| { |
| struct glink_defer_cmd *dcmd; |
| |
| extra = ALIGN(extra, SPI_ALIGNMENT); |
| |
| if (rx_avail < sizeof(struct glink_msg) + extra) { |
| dev_dbg(&glink->dev, "Insufficient data in rx fifo"); |
| return -ENXIO; |
| } |
| |
| dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_KERNEL); |
| if (!dcmd) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&dcmd->node); |
| |
| memcpy(&dcmd->msg, rx_data, sizeof(dcmd->msg) + extra); |
| |
| spin_lock(&glink->rx_lock); |
| list_add_tail(&dcmd->node, &glink->rx_queue); |
| spin_unlock(&glink->rx_lock); |
| |
| schedule_work(&glink->rx_defer_work); |
| |
| return 0; |
| } |
| |
| static void glink_spi_process_cmd(struct glink_spi *glink, void *rx_data, |
| u32 rx_size) |
| { |
| struct glink_msg *msg; |
| unsigned int param1; |
| unsigned int param2; |
| unsigned int param3; |
| unsigned int param4; |
| unsigned int cmd; |
| int offset = 0; |
| int ret; |
| u16 name_len; |
| char *name; |
| |
| while (offset < rx_size) { |
| msg = (struct glink_msg *)(rx_data + offset); |
| offset += sizeof(*msg); |
| |
| cmd = le16_to_cpu(msg->cmd); |
| param1 = le16_to_cpu(msg->param1); |
| param2 = le32_to_cpu(msg->param2); |
| param3 = le32_to_cpu(msg->param3); |
| param4 = le32_to_cpu(msg->param4); |
| |
| switch (cmd) { |
| case SPI_CMD_VERSION: |
| if (param3) { |
| glink->rx_pipe.length = param3; |
| glink->tx_pipe.length = param3; |
| } |
| glink_spi_receive_version(glink, param1, param2); |
| break; |
| case SPI_CMD_VERSION_ACK: |
| glink_spi_receive_version_ack(glink, param1, param2); |
| break; |
| case SPI_CMD_CLOSE: |
| case SPI_CMD_CLOSE_ACK: |
| glink_spi_rx_defer(glink, |
| rx_data + offset - sizeof(*msg), |
| rx_size + offset - sizeof(*msg), 0); |
| break; |
| case SPI_CMD_RX_INTENT_REQ: |
| glink_spi_handle_intent_req(glink, param1, param2); |
| break; |
| case SPI_CMD_OPEN_ACK: |
| ret = glink_spi_rx_open_ack(glink, param1); |
| break; |
| case SPI_CMD_OPEN: |
| name_len = (u16)(param2 & 0xFFFF); |
| name = rx_data + offset; |
| glink_spi_rx_defer(glink, |
| rx_data + offset - sizeof(*msg), |
| rx_size + offset - sizeof(*msg), |
| ALIGN(name_len, SPI_ALIGNMENT)); |
| |
| offset += ALIGN(name_len, SPI_ALIGNMENT); |
| break; |
| case SPI_CMD_TX_DATA: |
| case SPI_CMD_TX_DATA_CONT: |
| ret = glink_spi_rx_data(glink, param1, param2, |
| rx_data + offset, |
| rx_size - offset); |
| offset += ALIGN(ret, SPI_ALIGNMENT); |
| break; |
| case SPI_CMD_TX_SHORT_DATA: |
| ret = glink_spi_rx_short_data(glink, |
| param1, param2, |
| param3, param4, |
| rx_data + offset, |
| rx_size - offset); |
| offset += ALIGN(ret, SPI_ALIGNMENT); |
| break; |
| case SPI_CMD_READ_NOTIF: |
| break; |
| case SPI_CMD_INTENT: |
| ret = glink_spi_handle_intent(glink, |
| param1, param2, |
| rx_data + offset, |
| rx_size - offset); |
| offset += ALIGN(ret, SPI_ALIGNMENT); |
| break; |
| case SPI_CMD_RX_DONE: |
| glink_spi_handle_rx_done(glink, param1, param2, false); |
| break; |
| case SPI_CMD_RX_DONE_W_REUSE: |
| glink_spi_handle_rx_done(glink, param1, param2, true); |
| break; |
| case SPI_CMD_RX_INTENT_REQ_ACK: |
| glink_spi_handle_intent_req_ack(glink, param1, param2); |
| break; |
| case SPI_CMD_SIGNALS: |
| glink_spi_handle_signals(glink, param1, param2); |
| break; |
| default: |
| dev_err(&glink->dev, "unhandled rx cmd: %d\n", cmd); |
| break; |
| } |
| } |
| } |
| |
| static void glink_spi_work(struct kthread_work *work) |
| { |
| struct glink_spi *glink = container_of(work, struct glink_spi, |
| rx_work); |
| u32 inactive_cycles = 0; |
| u32 rx_avail; |
| void *rx_data; |
| |
| glink_spi_xprt_set_poll_mode(glink); |
| do { |
| rx_avail = glink_spi_rx_avail(glink); |
| if (!rx_avail) { |
| usleep_range(POLL_INTERVAL_US, POLL_INTERVAL_US + 50); |
| inactive_cycles++; |
| continue; |
| } |
| inactive_cycles = 0; |
| |
| rx_data = kzalloc(rx_avail, GFP_KERNEL); |
| if (!rx_data) |
| break; |
| |
| glink_spi_rx_peak(glink, rx_data, 0, rx_avail); |
| glink_spi_process_cmd(glink, rx_data, rx_avail); |
| kfree(rx_data); |
| glink_spi_rx_advance(glink, rx_avail); |
| |
| } while (inactive_cycles < MAX_INACTIVE_CYCLES && |
| !atomic_read(&glink->in_reset)); |
| glink_spi_xprt_set_irq_mode(glink); |
| } |
| |
| static int glink_spi_cmpnt_init(struct device *dev, void *priv) |
| { |
| return 0; |
| } |
| |
| static int glink_spi_cmpnt_deinit(struct device *dev, void *priv) |
| { |
| return 0; |
| } |
| |
| static int glink_spi_cmpnt_event_handler(struct device *dev, void *priv, |
| enum wdsp_event_type event, |
| void *data) |
| { |
| struct glink_spi *glink = dev_get_drvdata(dev); |
| struct glink_cmpnt *cmpnt = &glink->cmpnt; |
| int ret = 0; |
| |
| switch (event) { |
| case WDSP_EVENT_PRE_BOOTUP: |
| if (!cmpnt || !cmpnt->master_dev || !cmpnt->master_ops || |
| !cmpnt->master_ops->get_devops_for_cmpnt) |
| break; |
| |
| ret = cmpnt->master_ops->get_devops_for_cmpnt(cmpnt->master_dev, |
| WDSP_CMPNT_TRANSPORT, &glink->spi_ops); |
| if (ret) |
| GLINK_ERR(glink, "Failed to get transport device\n"); |
| break; |
| case WDSP_EVENT_POST_BOOTUP: |
| atomic_set(&glink->in_reset, 0); |
| ret = glink_spi_send_version(glink); |
| if (ret) |
| GLINK_ERR(glink, "failed to send version %d\n", ret); |
| |
| /* FALLTHROUGH */ |
| case WDSP_EVENT_IPC1_INTR: |
| kthread_queue_work(&glink->rx_worker, &glink->rx_work); |
| break; |
| case WDSP_EVENT_PRE_SHUTDOWN: |
| glink_spi_remove(glink); |
| break; |
| case WDSP_EVENT_RESUME: |
| break; |
| case WDSP_EVENT_SUSPEND: |
| if (atomic_read(&glink->activity_cnt)) |
| ret = -EBUSY; |
| break; |
| default: |
| GLINK_INFO(glink, "unhandled event %d", event); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* glink_spi_cmpnt_ops - Callback operations registered wtih wdsp framework */ |
| static struct wdsp_cmpnt_ops glink_spi_cmpnt_ops = { |
| .init = glink_spi_cmpnt_init, |
| .deinit = glink_spi_cmpnt_deinit, |
| .event_handler = glink_spi_cmpnt_event_handler, |
| }; |
| |
| static int glink_component_bind(struct device *dev, struct device *master, |
| void *data) |
| { |
| struct glink_spi *glink = dev_get_drvdata(dev); |
| struct glink_cmpnt *cmpnt = &glink->cmpnt; |
| int ret = 0; |
| |
| cmpnt->master_dev = master; |
| cmpnt->master_ops = data; |
| |
| if (cmpnt->master_ops && cmpnt->master_ops->register_cmpnt_ops) |
| ret = cmpnt->master_ops->register_cmpnt_ops(master, dev, glink, |
| &glink_spi_cmpnt_ops); |
| else |
| ret = -EINVAL; |
| |
| if (ret) |
| dev_err(dev, "%s: register_cmpnt_ops failed, err = %d\n", |
| __func__, ret); |
| return ret; |
| } |
| |
| static void glink_component_unbind(struct device *dev, struct device *master, |
| void *data) |
| { |
| struct glink_spi *glink = dev_get_drvdata(dev); |
| struct glink_cmpnt *cmpnt = &glink->cmpnt; |
| |
| cmpnt->master_dev = NULL; |
| cmpnt->master_ops = NULL; |
| } |
| |
| static const struct component_ops glink_component_ops = { |
| .bind = glink_component_bind, |
| .unbind = glink_component_unbind, |
| }; |
| |
| static int glink_spi_init_pipe(const char *key, struct device_node *node, |
| struct glink_spi_pipe *pipe) |
| { |
| const struct property *prop = NULL; |
| __be32 *addrs; |
| |
| prop = of_find_property(node, key, NULL); |
| if (!prop) { |
| pr_err("%s failed to find prop %s\n", __func__, key); |
| return -ENODEV; |
| } |
| |
| if ((prop->length / sizeof(u32)) != 2) { |
| pr_err("%s %s wrong length %d\n", __func__, key, prop->length); |
| return -EINVAL; |
| } |
| addrs = prop->value; |
| |
| pipe->tail_addr = be32_to_cpup(addrs++); |
| pipe->head_addr = be32_to_cpup(addrs++); |
| pipe->length = DEFAULT_FIFO_SIZE; |
| |
| return 0; |
| } |
| |
| static void glink_spi_release(struct device *dev) |
| { |
| struct glink_spi *glink = container_of(dev, struct glink_spi, dev); |
| |
| kfree(glink); |
| } |
| |
| struct glink_spi *qcom_glink_spi_register(struct device *parent, |
| struct device_node *node) |
| { |
| struct glink_spi *glink; |
| struct device *dev; |
| int ret; |
| |
| glink = kzalloc(sizeof(*glink), GFP_KERNEL); |
| if (!glink) |
| return ERR_PTR(-ENOMEM); |
| |
| dev = &glink->dev; |
| dev->parent = parent; |
| dev->of_node = node; |
| dev->release = glink_spi_release; |
| dev_set_name(dev, "%s:%s", node->parent->name, node->name); |
| ret = device_register(dev); |
| if (ret) { |
| pr_err("failed to register glink edge\n"); |
| return ERR_PTR(ret); |
| } |
| dev_set_drvdata(dev, glink); |
| |
| ret = of_property_read_string(dev->of_node, "label", &glink->name); |
| if (ret < 0) |
| glink->name = dev->of_node->name; |
| |
| glink->features = GLINK_FEATURE_INTENT_REUSE; |
| glink->intentless = false; |
| |
| mutex_init(&glink->tx_lock); |
| spin_lock_init(&glink->rx_lock); |
| INIT_LIST_HEAD(&glink->rx_queue); |
| INIT_WORK(&glink->rx_defer_work, glink_spi_defer_work); |
| |
| kthread_init_work(&glink->rx_work, glink_spi_work); |
| kthread_init_worker(&glink->rx_worker); |
| |
| spin_lock_init(&glink->idr_lock); |
| idr_init(&glink->lcids); |
| idr_init(&glink->rcids); |
| |
| atomic_set(&glink->in_reset, 1); |
| atomic_set(&glink->activity_cnt, 0); |
| |
| ret = glink_spi_init_pipe("tx-descriptors", node, &glink->tx_pipe); |
| if (ret) |
| goto err_put_dev; |
| |
| ret = glink_spi_init_pipe("rx-descriptors", node, &glink->rx_pipe); |
| if (ret) |
| goto err_put_dev; |
| |
| ret = component_add(dev, &glink_component_ops); |
| if (ret) { |
| dev_err(dev, "component_add failed, err = %d\n", ret); |
| goto err_put_dev; |
| } |
| |
| glink->ilc = ipc_log_context_create(GLINK_LOG_PAGE_CNT, glink->name, 0); |
| |
| glink->rx_task = kthread_run(kthread_worker_fn, &glink->rx_worker, |
| "spi_%s", glink->name); |
| if (IS_ERR(glink->rx_task)) { |
| ret = PTR_ERR(glink->rx_task); |
| dev_err(dev, "kthread run failed %d\n", ret); |
| goto err_put_dev; |
| } |
| |
| return glink; |
| |
| err_put_dev: |
| dev_set_drvdata(dev, NULL); |
| put_device(dev); |
| |
| return ERR_PTR(ret); |
| } |
| EXPORT_SYMBOL(qcom_glink_spi_register); |
| |
| static int glink_spi_remove_device(struct device *dev, void *data) |
| { |
| device_unregister(dev); |
| |
| return 0; |
| } |
| |
| static void glink_spi_remove(struct glink_spi *glink) |
| { |
| struct glink_spi_pipe *rx_pipe = &glink->rx_pipe; |
| struct glink_spi_pipe *tx_pipe = &glink->tx_pipe; |
| struct glink_channel *channel; |
| int cid; |
| int ret; |
| unsigned long flags; |
| |
| GLINK_INFO(glink, "\n"); |
| |
| atomic_set(&glink->in_reset, 1); |
| kthread_cancel_work_sync(&glink->rx_work); |
| cancel_work_sync(&glink->rx_defer_work); |
| |
| ret = device_for_each_child(&glink->dev, NULL, glink_spi_remove_device); |
| if (ret) |
| dev_warn(&glink->dev, "Can't remove GLINK devices: %d\n", ret); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| idr_for_each_entry(&glink->lcids, channel, cid) { |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| /* cancel_work_sync may sleep */ |
| cancel_work_sync(&channel->intent_work); |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| } |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| spin_lock_irqsave(&glink->idr_lock, flags); |
| /* Release any defunct local channels, waiting for close-ack */ |
| idr_for_each_entry(&glink->lcids, channel, cid) { |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| idr_remove(&glink->lcids, cid); |
| } |
| |
| /* Release any defunct local channels, waiting for close-req */ |
| idr_for_each_entry(&glink->lcids, channel, cid) { |
| kref_put(&channel->refcount, glink_spi_channel_release); |
| idr_remove(&glink->lcids, cid); |
| } |
| |
| idr_destroy(&glink->lcids); |
| idr_destroy(&glink->rcids); |
| spin_unlock_irqrestore(&glink->idr_lock, flags); |
| |
| tx_pipe->fifo_base = 0; |
| tx_pipe->local_addr = 0; |
| tx_pipe->length = DEFAULT_FIFO_SIZE; |
| |
| rx_pipe->fifo_base = 0; |
| rx_pipe->local_addr = 0; |
| rx_pipe->length = DEFAULT_FIFO_SIZE; |
| } |
| |
| void qcom_glink_spi_unregister(struct glink_spi *glink) |
| { |
| device_unregister(&glink->dev); |
| } |
| EXPORT_SYMBOL(qcom_glink_spi_unregister); |
| |
| MODULE_DESCRIPTION("QTI GLINK SPI Transport"); |
| MODULE_LICENSE("GPL v2"); |