net: remove the caif_hsi driver

The caif_hsi driver relies on a cfhsi_get_ops symbol using symbol_get,
but this symbol is not provided anywhere in the kernel tree.  Remove
this driver given that it is dead code.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/caif/Kconfig

@@ -20,15 +20,6 @@ config CAIF_TTY
 	  identified as N_CAIF. When this ldisc is opened from user space
 	  it will redirect the TTY's traffic into the CAIF stack.
 
-config CAIF_HSI
-	tristate "CAIF HSI transport driver"
-	depends on CAIF
-	default n
-	help
-	  The CAIF low level driver for CAIF over HSI.
-	  Be aware that if you enable this then you also need to
-	  enable a low-level HSI driver.
-
 config CAIF_VIRTIO
 	tristate "CAIF virtio transport driver"
 	depends on CAIF && HAS_DMA

drivers/net/caif/Makefile

@@ -4,8 +4,5 @@ ccflags-$(CONFIG_CAIF_DEBUG) := -DDEBUG
 # Serial interface
 obj-$(CONFIG_CAIF_TTY) += caif_serial.o
 
-# HSI interface
-obj-$(CONFIG_CAIF_HSI) += caif_hsi.o
-
 # Virtio interface
 obj-$(CONFIG_CAIF_VIRTIO) += caif_virtio.o

include/net/caif/caif_hsi.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) ST-Ericsson AB 2010
- * Author:  Daniel Martensson / daniel.martensson@stericsson.com
- *	    Dmitry.Tarnyagin  / dmitry.tarnyagin@stericsson.com
- */
-
-#ifndef CAIF_HSI_H_
-#define CAIF_HSI_H_
-
-#include <net/caif/caif_layer.h>
-#include <net/caif/caif_device.h>
-#include <linux/atomic.h>
-
-/*
- * Maximum number of CAIF frames that can reside in the same HSI frame.
- */
-#define CFHSI_MAX_PKTS 15
-
-/*
- * Maximum number of bytes used for the frame that can be embedded in the
- * HSI descriptor.
- */
-#define CFHSI_MAX_EMB_FRM_SZ 96
-
-/*
- * Decides if HSI buffers should be prefilled with 0xFF pattern for easier
- * debugging. Both TX and RX buffers will be filled before the transfer.
- */
-#define CFHSI_DBG_PREFILL		0
-
-/* Structure describing a HSI packet descriptor. */
-#pragma pack(1) /* Byte alignment. */
-struct cfhsi_desc {
-	u8 header;
-	u8 offset;
-	u16 cffrm_len[CFHSI_MAX_PKTS];
-	u8 emb_frm[CFHSI_MAX_EMB_FRM_SZ];
-};
-#pragma pack() /* Default alignment. */
-
-/* Size of the complete HSI packet descriptor. */
-#define CFHSI_DESC_SZ (sizeof(struct cfhsi_desc))
-
-/*
- * Size of the complete HSI packet descriptor excluding the optional embedded
- * CAIF frame.
- */
-#define CFHSI_DESC_SHORT_SZ (CFHSI_DESC_SZ - CFHSI_MAX_EMB_FRM_SZ)
-
-/*
- * Maximum bytes transferred in one transfer.
- */
-#define CFHSI_MAX_CAIF_FRAME_SZ 4096
-
-#define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * CFHSI_MAX_CAIF_FRAME_SZ)
-
-/* Size of the complete HSI TX buffer. */
-#define CFHSI_BUF_SZ_TX (CFHSI_DESC_SZ + CFHSI_MAX_PAYLOAD_SZ)
-
-/* Size of the complete HSI RX buffer. */
-#define CFHSI_BUF_SZ_RX ((2 * CFHSI_DESC_SZ) + CFHSI_MAX_PAYLOAD_SZ)
-
-/* Bitmasks for the HSI descriptor. */
-#define CFHSI_PIGGY_DESC		(0x01 << 7)
-
-#define CFHSI_TX_STATE_IDLE			0
-#define CFHSI_TX_STATE_XFER			1
-
-#define CFHSI_RX_STATE_DESC			0
-#define CFHSI_RX_STATE_PAYLOAD			1
-
-/* Bitmasks for power management. */
-#define CFHSI_WAKE_UP				0
-#define CFHSI_WAKE_UP_ACK			1
-#define CFHSI_WAKE_DOWN_ACK			2
-#define CFHSI_AWAKE				3
-#define CFHSI_WAKELOCK_HELD			4
-#define CFHSI_SHUTDOWN				5
-#define CFHSI_FLUSH_FIFO			6
-
-#ifndef CFHSI_INACTIVITY_TOUT
-#define CFHSI_INACTIVITY_TOUT			(1 * HZ)
-#endif /* CFHSI_INACTIVITY_TOUT */
-
-#ifndef CFHSI_WAKE_TOUT
-#define CFHSI_WAKE_TOUT			(3 * HZ)
-#endif /* CFHSI_WAKE_TOUT */
-
-#ifndef CFHSI_MAX_RX_RETRIES
-#define CFHSI_MAX_RX_RETRIES		(10 * HZ)
-#endif
-
-/* Structure implemented by the CAIF HSI driver. */
-struct cfhsi_cb_ops {
-	void (*tx_done_cb) (struct cfhsi_cb_ops *drv);
-	void (*rx_done_cb) (struct cfhsi_cb_ops *drv);
-	void (*wake_up_cb) (struct cfhsi_cb_ops *drv);
-	void (*wake_down_cb) (struct cfhsi_cb_ops *drv);
-};
-
-/* Structure implemented by HSI device. */
-struct cfhsi_ops {
-	int (*cfhsi_up) (struct cfhsi_ops *dev);
-	int (*cfhsi_down) (struct cfhsi_ops *dev);
-	int (*cfhsi_tx) (u8 *ptr, int len, struct cfhsi_ops *dev);
-	int (*cfhsi_rx) (u8 *ptr, int len, struct cfhsi_ops *dev);
-	int (*cfhsi_wake_up) (struct cfhsi_ops *dev);
-	int (*cfhsi_wake_down) (struct cfhsi_ops *dev);
-	int (*cfhsi_get_peer_wake) (struct cfhsi_ops *dev, bool *status);
-	int (*cfhsi_fifo_occupancy) (struct cfhsi_ops *dev, size_t *occupancy);
-	int (*cfhsi_rx_cancel)(struct cfhsi_ops *dev);
-	struct cfhsi_cb_ops *cb_ops;
-};
-
-/* Structure holds status of received CAIF frames processing */
-struct cfhsi_rx_state {
-	int state;
-	int nfrms;
-	int pld_len;
-	int retries;
-	bool piggy_desc;
-};
-
-/* Priority mapping */
-enum {
-	CFHSI_PRIO_CTL = 0,
-	CFHSI_PRIO_VI,
-	CFHSI_PRIO_VO,
-	CFHSI_PRIO_BEBK,
-	CFHSI_PRIO_LAST,
-};
-
-struct cfhsi_config {
-	u32 inactivity_timeout;
-	u32 aggregation_timeout;
-	u32 head_align;
-	u32 tail_align;
-	u32 q_high_mark;
-	u32 q_low_mark;
-};
-
-/* Structure implemented by CAIF HSI drivers. */
-struct cfhsi {
-	struct caif_dev_common cfdev;
-	struct net_device *ndev;
-	struct platform_device *pdev;
-	struct sk_buff_head qhead[CFHSI_PRIO_LAST];
-	struct cfhsi_cb_ops cb_ops;
-	struct cfhsi_ops *ops;
-	int tx_state;
-	struct cfhsi_rx_state rx_state;
-	struct cfhsi_config cfg;
-	int rx_len;
-	u8 *rx_ptr;
-	u8 *tx_buf;
-	u8 *rx_buf;
-	u8 *rx_flip_buf;
-	spinlock_t lock;
-	int flow_off_sent;
-	struct list_head list;
-	struct work_struct wake_up_work;
-	struct work_struct wake_down_work;
-	struct work_struct out_of_sync_work;
-	struct workqueue_struct *wq;
-	wait_queue_head_t wake_up_wait;
-	wait_queue_head_t wake_down_wait;
-	wait_queue_head_t flush_fifo_wait;
-	struct timer_list inactivity_timer;
-	struct timer_list rx_slowpath_timer;
-
-	/* TX aggregation */
-	int aggregation_len;
-	struct timer_list aggregation_timer;
-
-	unsigned long bits;
-};
-extern struct platform_driver cfhsi_driver;
-
-/**
- * enum ifla_caif_hsi - CAIF HSI NetlinkRT parameters.
- * @IFLA_CAIF_HSI_INACTIVITY_TOUT: Inactivity timeout before
- *			taking the HSI wakeline down, in milliseconds.
- * When using RT Netlink to create, destroy or configure a CAIF HSI interface,
- * enum ifla_caif_hsi is used to specify the configuration attributes.
- */
-enum ifla_caif_hsi {
-	__IFLA_CAIF_HSI_UNSPEC,
-	__IFLA_CAIF_HSI_INACTIVITY_TOUT,
-	__IFLA_CAIF_HSI_AGGREGATION_TOUT,
-	__IFLA_CAIF_HSI_HEAD_ALIGN,
-	__IFLA_CAIF_HSI_TAIL_ALIGN,
-	__IFLA_CAIF_HSI_QHIGH_WATERMARK,
-	__IFLA_CAIF_HSI_QLOW_WATERMARK,
-	__IFLA_CAIF_HSI_MAX
-};
-
-struct cfhsi_ops *cfhsi_get_ops(void);
-
-#endif		/* CAIF_HSI_H_ */