Commit 55936779 authored by Dave Penkler's avatar Dave Penkler Committed by Greg Kroah-Hartman
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staging: gpib: Add Fluke cda based cards GPIB driver 



Driver for Fluke cda based cards

Signed-off-by: default avatarDave Penkler <dpenkler@gmail.com>
Link: https://lore.kernel.org/r/20240918121908.19366-13-dpenkler@gmail.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e1339245

drivers/staging/gpib/eastwood/Makefile

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obj-m += fluke_gpib.o

drivers/staging/gpib/eastwood/fluke_gpib.c

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File added.

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drivers/staging/gpib/eastwood/fluke_gpib.h

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/* SPDX-License-Identifier: GPL-2.0 */



/***************************************************************************

 *   Author: Frank Mori Hess <fmh6jj@gmail.com>

 *   copyright: (C) 2006, 2010, 2015 Fluke Corporation

 ***************************************************************************/



#include <linux/compiler.h>

#include <linux/dmaengine.h>

#include <linux/io.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include "nec7210.h"



struct fluke_priv {

	struct nec7210_priv nec7210_priv;

	struct resource *gpib_iomem_res;

	struct resource *write_transfer_counter_res;

	struct resource *dma_port_res;

	int irq;

	struct dma_chan *dma_channel;

	u8 *dma_buffer;

	int dma_buffer_size;

	void *write_transfer_counter;

};



// cb7210 specific registers and bits

enum cb7210_regs {

	STATE1_REG = 0x4,

	ISR0_IMR0 = 0x6,

	BUS_STATUS = 0x7

};



enum cb7210_page_in {

	ISR0_IMR0_PAGE = 1,

	BUS_STATUS_PAGE = 1,

	STATE1_PAGE = 1

};



/* IMR0 -- Interrupt Mode Register 0 */

enum imr0_bits {

	FLUKE_IFCIE_BIT = 0x8,	/* interface clear interrupt */

};



/* ISR0 -- Interrupt Status Register 0 */

enum isr0_bits {

	FLUKE_IFCI_BIT = 0x8,	/* interface clear interrupt */

};



enum state1_bits {

	SOURCE_HANDSHAKE_SIDS_BITS = 0x0, /* source idle state */

	SOURCE_HANDSHAKE_SGNS_BITS = 0x1, /* source generate state */

	SOURCE_HANDSHAKE_SDYS_BITS = 0x2, /* source delay state */

	SOURCE_HANDSHAKE_STRS_BITS = 0x5, /* source transfer state */

	SOURCE_HANDSHAKE_MASK = 0x7

};



// we customized the cb7210 vhdl to give the "data in" status

// on the unused bit 7 of the address0 register.

enum cb7210_address0 {

	DATA_IN_STATUS = 0x80

};



static inline int cb7210_page_in_bits(unsigned int page)

{

	return 0x50 | (page & 0xf);

}



// don't use without locking nec_priv->register_page_lock

static inline uint8_t fluke_read_byte_nolock(struct nec7210_priv *nec_priv,

					     int register_num)

{

	u8 retval;



	retval = readl(nec_priv->iobase + register_num * nec_priv->offset);

	return retval;

}



// don't use without locking nec_priv->register_page_lock

static inline void fluke_write_byte_nolock(struct nec7210_priv *nec_priv, uint8_t data,

					   int register_num)

{

	writel(data, nec_priv->iobase + register_num * nec_priv->offset);

}



static inline uint8_t fluke_paged_read_byte(struct fluke_priv *e_priv,

					    unsigned int register_num, unsigned int page)

{

	struct nec7210_priv *nec_priv = &e_priv->nec7210_priv;

	u8 retval;

	unsigned long flags;



	spin_lock_irqsave(&nec_priv->register_page_lock, flags);

	fluke_write_byte_nolock(nec_priv, cb7210_page_in_bits(page), AUXMR);

	udelay(1);

	/* chip auto clears the page after a read */

	retval = fluke_read_byte_nolock(nec_priv, register_num);

	spin_unlock_irqrestore(&nec_priv->register_page_lock, flags);

	return retval;

}



static inline void fluke_paged_write_byte(struct fluke_priv *e_priv, uint8_t data,

					  unsigned int register_num, unsigned int page)

{

	struct nec7210_priv *nec_priv = &e_priv->nec7210_priv;

	unsigned long flags;



	spin_lock_irqsave(&nec_priv->register_page_lock, flags);

	fluke_write_byte_nolock(nec_priv, cb7210_page_in_bits(page), AUXMR);

	udelay(1);

	fluke_write_byte_nolock(nec_priv, data, register_num);

	spin_unlock_irqrestore(&nec_priv->register_page_lock, flags);

}



enum bus_status_bits {

	BSR_ATN_BIT = 0x1,

	BSR_EOI_BIT = 0x2,

	BSR_SRQ_BIT = 0x4,

	BSR_IFC_BIT = 0x8,

	BSR_REN_BIT = 0x10,

	BSR_DAV_BIT = 0x20,

	BSR_NRFD_BIT = 0x40,

	BSR_NDAC_BIT = 0x80,

};



enum cb7210_aux_cmds {

/* AUX_RTL2 is an undocumented aux command which causes cb7210 to assert

 *	(and keep asserted) local rtl message.  This is used in conjunction

 *	with the (stupid) cb7210 implementation

 *	of the normal nec7210 AUX_RTL aux command, which

 *	causes the rtl message to toggle between on and off.

 */

	AUX_RTL2 = 0xd,

	AUX_NBAF = 0xe,	// new byte available false (also clears seoi)

	AUX_LO_SPEED = 0x40,

	AUX_HI_SPEED = 0x41,

};



static const int fluke_reg_offset = 4;

static const int fluke_num_regs = 8;

static const unsigned int write_transfer_counter_mask = 0x7ff;