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c31bbc140b
The driver was originally written with the assumption that a different API must be used for DMA-related functions if the device is PCIe based or if not. Since Xillybus' driver supports devices on a PCIe bus (with xillybus_pcie) as well as connected directly to the processor (with xillybus_of), it originally used wrapper functions that ensure that a different API is used for each. This patch eliminates the said wrapper functions, as all use the same dma_* API now. This is most notable by the code deleted in xillybus_pcie.c and xillybus_of.c. It also eliminates the OF driver's check for a "dma-coherent" attribute in the device's OF entry, since this is taken care of by the kernel's implementation of dma_sync_single_for_*(). There is however still need for one wrapper function, which is merged from xillybus_pcie.c and xillybus_of.c into xillybus_core.c: The call to dma_map_single() is wrapped by a function that uses the Managed Device (devres) framework, in the absence of a relevant function in the current kernel's API. Suggested-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Suggested-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Eli Billauer <eli.billauer@gmail.com> Link: https://lore.kernel.org/r/20210929094442.46383-1-eli.billauer@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/drivers/misc/xillybus.h
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*
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* Copyright 2011 Xillybus Ltd, http://xillybus.com
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*
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* Header file for the Xillybus FPGA/host framework.
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*/
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#ifndef __XILLYBUS_H
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#define __XILLYBUS_H
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/cdev.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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struct xilly_endpoint_hardware;
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struct xilly_buffer {
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void *addr;
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dma_addr_t dma_addr;
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int end_offset; /* Counting elements, not bytes */
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};
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struct xilly_idt_handle {
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unsigned char *chandesc;
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unsigned char *names;
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int names_len;
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int entries;
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};
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/*
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* Read-write confusion: wr_* and rd_* notation sticks to FPGA view, so
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* wr_* buffers are those consumed by read(), since the FPGA writes to them
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* and vice versa.
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*/
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struct xilly_channel {
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struct xilly_endpoint *endpoint;
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int chan_num;
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int log2_element_size;
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int seekable;
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struct xilly_buffer **wr_buffers; /* FPGA writes, driver reads! */
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int num_wr_buffers;
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unsigned int wr_buf_size; /* In bytes */
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int wr_fpga_buf_idx;
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int wr_host_buf_idx;
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int wr_host_buf_pos;
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int wr_empty;
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int wr_ready; /* Significant only when wr_empty == 1 */
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int wr_sleepy;
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int wr_eof;
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int wr_hangup;
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spinlock_t wr_spinlock;
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struct mutex wr_mutex;
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wait_queue_head_t wr_wait;
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wait_queue_head_t wr_ready_wait;
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int wr_ref_count;
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int wr_synchronous;
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int wr_allow_partial;
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int wr_exclusive_open;
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int wr_supports_nonempty;
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struct xilly_buffer **rd_buffers; /* FPGA reads, driver writes! */
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int num_rd_buffers;
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unsigned int rd_buf_size; /* In bytes */
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int rd_fpga_buf_idx;
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int rd_host_buf_pos;
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int rd_host_buf_idx;
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int rd_full;
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spinlock_t rd_spinlock;
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struct mutex rd_mutex;
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wait_queue_head_t rd_wait;
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int rd_ref_count;
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int rd_allow_partial;
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int rd_synchronous;
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int rd_exclusive_open;
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struct delayed_work rd_workitem;
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unsigned char rd_leftovers[4];
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};
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struct xilly_endpoint {
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struct device *dev;
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struct module *owner;
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int dma_using_dac; /* =1 if 64-bit DMA is used, =0 otherwise. */
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__iomem void *registers;
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int fatal_error;
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struct mutex register_mutex;
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wait_queue_head_t ep_wait;
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int num_channels; /* EXCLUDING message buffer */
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struct xilly_channel **channels;
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int msg_counter;
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int failed_messages;
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int idtlen;
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u32 *msgbuf_addr;
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dma_addr_t msgbuf_dma_addr;
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unsigned int msg_buf_size;
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};
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struct xilly_mapping {
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struct device *device;
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dma_addr_t dma_addr;
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size_t size;
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int direction;
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};
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irqreturn_t xillybus_isr(int irq, void *data);
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struct xilly_endpoint *xillybus_init_endpoint(struct device *dev);
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int xillybus_endpoint_discovery(struct xilly_endpoint *endpoint);
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void xillybus_endpoint_remove(struct xilly_endpoint *endpoint);
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#endif /* __XILLYBUS_H */
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