From f2bf88c4afc8c5ab92b40af24819933e57d0968c Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 29 Sep 2020 22:25:11 +0200
Subject: net: caif: Remove unused caif SPI driver
While chasing in_interrupt() (ab)use in drivers it turned out that the
caif_spi driver has never been in use since the driver was merged 10 years
ago. There never was any matching code which provides a platform device.
The driver has not seen any update (asided of treewide changes and
cleanups) since 8 years and the maintainers vanished from the planet.
So analysing the potential contexts and the (in)correctness of
in_interrupt() usage is just a pointless exercise.
Remove the cruft.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/net/caif/caif_spi.h | 155 --------------------------------------------
1 file changed, 155 deletions(-)
delete mode 100644 include/net/caif/caif_spi.h
(limited to 'include/net/caif')
diff --git a/include/net/caif/caif_spi.h b/include/net/caif/caif_spi.h
deleted file mode 100644
index a0bf4cbce71b..000000000000
--- a/include/net/caif/caif_spi.h
+++ /dev/null
@@ -1,155 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) ST-Ericsson AB 2010
- * Author: Daniel Martensson / Daniel.Martensson@stericsson.com
- */
-
-#ifndef CAIF_SPI_H_
-#define CAIF_SPI_H_
-
-#include <net/caif/caif_device.h>
-
-#define SPI_CMD_WR 0x00
-#define SPI_CMD_RD 0x01
-#define SPI_CMD_EOT 0x02
-#define SPI_CMD_IND 0x04
-
-#define SPI_DMA_BUF_LEN 8192
-
-#define WL_SZ 2 /* 16 bits. */
-#define SPI_CMD_SZ 4 /* 32 bits. */
-#define SPI_IND_SZ 4 /* 32 bits. */
-
-#define SPI_XFER 0
-#define SPI_SS_ON 1
-#define SPI_SS_OFF 2
-#define SPI_TERMINATE 3
-
-/* Minimum time between different levels is 50 microseconds. */
-#define MIN_TRANSITION_TIME_USEC 50
-
-/* Defines for calculating duration of SPI transfers for a particular
- * number of bytes.
- */
-#define SPI_MASTER_CLK_MHZ 13
-#define SPI_XFER_TIME_USEC(bytes, clk) (((bytes) * 8) / clk)
-
-/* Normally this should be aligned on the modem in order to benefit from full
- * duplex transfers. However a size of 8188 provokes errors when running with
- * the modem. These errors occur when packet sizes approaches 4 kB of data.
- */
-#define CAIF_MAX_SPI_FRAME 4092
-
-/* Maximum number of uplink CAIF frames that can reside in the same SPI frame.
- * This number should correspond with the modem setting. The application side
- * CAIF accepts any number of embedded downlink CAIF frames.
- */
-#define CAIF_MAX_SPI_PKTS 9
-
-/* Decides if SPI buffers should be prefilled with 0xFF pattern for easier
- * debugging. Both TX and RX buffers will be filled before the transfer.
- */
-#define CFSPI_DBG_PREFILL 0
-
-/* Structure describing a SPI transfer. */
-struct cfspi_xfer {
- u16 tx_dma_len;
- u16 rx_dma_len;
- void *va_tx[2];
- dma_addr_t pa_tx[2];
- void *va_rx;
- dma_addr_t pa_rx;
-};
-
-/* Structure implemented by the SPI interface. */
-struct cfspi_ifc {
- void (*ss_cb) (bool assert, struct cfspi_ifc *ifc);
- void (*xfer_done_cb) (struct cfspi_ifc *ifc);
- void *priv;
-};
-
-/* Structure implemented by SPI clients. */
-struct cfspi_dev {
- int (*init_xfer) (struct cfspi_xfer *xfer, struct cfspi_dev *dev);
- void (*sig_xfer) (bool xfer, struct cfspi_dev *dev);
- struct cfspi_ifc *ifc;
- char *name;
- u32 clk_mhz;
- void *priv;
-};
-
-/* Enumeration describing the CAIF SPI state. */
-enum cfspi_state {
- CFSPI_STATE_WAITING = 0,
- CFSPI_STATE_AWAKE,
- CFSPI_STATE_FETCH_PKT,
- CFSPI_STATE_GET_NEXT,
- CFSPI_STATE_INIT_XFER,
- CFSPI_STATE_WAIT_ACTIVE,
- CFSPI_STATE_SIG_ACTIVE,
- CFSPI_STATE_WAIT_XFER_DONE,
- CFSPI_STATE_XFER_DONE,
- CFSPI_STATE_WAIT_INACTIVE,
- CFSPI_STATE_SIG_INACTIVE,
- CFSPI_STATE_DELIVER_PKT,
- CFSPI_STATE_MAX,
-};
-
-/* Structure implemented by SPI physical interfaces. */
-struct cfspi {
- struct caif_dev_common cfdev;
- struct net_device *ndev;
- struct platform_device *pdev;
- struct sk_buff_head qhead;
- struct sk_buff_head chead;
- u16 cmd;
- u16 tx_cpck_len;
- u16 tx_npck_len;
- u16 rx_cpck_len;
- u16 rx_npck_len;
- struct cfspi_ifc ifc;
- struct cfspi_xfer xfer;
- struct cfspi_dev *dev;
- unsigned long state;
- struct work_struct work;
- struct workqueue_struct *wq;
- struct list_head list;
- int flow_off_sent;
- u32 qd_low_mark;
- u32 qd_high_mark;
- struct completion comp;
- wait_queue_head_t wait;
- spinlock_t lock;
- bool flow_stop;
- bool slave;
- bool slave_talked;
-#ifdef CONFIG_DEBUG_FS
- enum cfspi_state dbg_state;
- u16 pcmd;
- u16 tx_ppck_len;
- u16 rx_ppck_len;
- struct dentry *dbgfs_dir;
- struct dentry *dbgfs_state;
- struct dentry *dbgfs_frame;
-#endif /* CONFIG_DEBUG_FS */
-};
-
-extern int spi_frm_align;
-extern int spi_up_head_align;
-extern int spi_up_tail_align;
-extern int spi_down_head_align;
-extern int spi_down_tail_align;
-extern struct platform_driver cfspi_spi_driver;
-
-void cfspi_dbg_state(struct cfspi *cfspi, int state);
-int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len);
-int cfspi_xmitlen(struct cfspi *cfspi);
-int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len);
-int cfspi_spi_remove(struct platform_device *pdev);
-int cfspi_spi_probe(struct platform_device *pdev);
-int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len);
-int cfspi_xmitlen(struct cfspi *cfspi);
-int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len);
-void cfspi_xfer(struct work_struct *work);
-
-#endif /* CAIF_SPI_H_ */
--
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