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e6ab504633
Move the gpib drivers out of staging and into the "real" part of the kernel. This entails: - Remove the gpib Kconfig menu and Makefile build rule from staging. - Remove gpib/uapi from the header file search path in subdir-ccflags of the gpib Makefile - move the gpib/uapi files to include/uapi/linux - Move the gpib tree out of staging to drivers. - Remove the word "Linux" from the gpib Kconfig file. - Add the gpib Kconfig menu and Makefile build rule to drivers Signed-off-by: Dave Penkler <dpenkler@gmail.com> Link: https://patch.msgid.link/20251117144021.23569-5-dpenkler@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/***************************************************************************
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* Author: Frank Mori Hess <fmh6jj@gmail.com>
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* copyright: (C) 2006, 2010, 2015 Fluke Corporation
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***************************************************************************/
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#include <linux/compiler.h>
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#include <linux/dmaengine.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include "nec7210.h"
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struct fluke_priv {
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struct nec7210_priv nec7210_priv;
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struct resource *gpib_iomem_res;
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struct resource *write_transfer_counter_res;
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struct resource *dma_port_res;
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int irq;
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struct dma_chan *dma_channel;
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u8 *dma_buffer;
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int dma_buffer_size;
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void __iomem *write_transfer_counter;
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};
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// cb7210 specific registers and bits
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enum cb7210_regs {
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STATE1_REG = 0x4,
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ISR0_IMR0 = 0x6,
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BUS_STATUS = 0x7
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};
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enum cb7210_page_in {
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ISR0_IMR0_PAGE = 1,
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BUS_STATUS_PAGE = 1,
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STATE1_PAGE = 1
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};
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/* IMR0 -- Interrupt Mode Register 0 */
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enum imr0_bits {
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FLUKE_IFCIE_BIT = 0x8, /* interface clear interrupt */
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};
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/* ISR0 -- Interrupt Status Register 0 */
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enum isr0_bits {
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FLUKE_IFCI_BIT = 0x8, /* interface clear interrupt */
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};
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enum state1_bits {
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SOURCE_HANDSHAKE_SIDS_BITS = 0x0, /* source idle state */
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SOURCE_HANDSHAKE_SGNS_BITS = 0x1, /* source generate state */
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SOURCE_HANDSHAKE_SDYS_BITS = 0x2, /* source delay state */
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SOURCE_HANDSHAKE_STRS_BITS = 0x5, /* source transfer state */
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SOURCE_HANDSHAKE_MASK = 0x7
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};
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/*
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* we customized the cb7210 vhdl to give the "data in" status
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* on the unused bit 7 of the address0 register.
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*/
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enum cb7210_address0 {
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DATA_IN_STATUS = 0x80
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};
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static inline int cb7210_page_in_bits(unsigned int page)
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{
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return 0x50 | (page & 0xf);
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}
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// don't use without locking nec_priv->register_page_lock
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static inline u8 fluke_read_byte_nolock(struct nec7210_priv *nec_priv,
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int register_num)
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{
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u8 retval;
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retval = readl(nec_priv->mmiobase + register_num * nec_priv->offset);
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return retval;
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}
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// don't use without locking nec_priv->register_page_lock
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static inline void fluke_write_byte_nolock(struct nec7210_priv *nec_priv, u8 data,
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int register_num)
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{
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writel(data, nec_priv->mmiobase + register_num * nec_priv->offset);
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}
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static inline u8 fluke_paged_read_byte(struct fluke_priv *e_priv,
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unsigned int register_num, unsigned int page)
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{
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struct nec7210_priv *nec_priv = &e_priv->nec7210_priv;
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u8 retval;
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unsigned long flags;
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spin_lock_irqsave(&nec_priv->register_page_lock, flags);
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fluke_write_byte_nolock(nec_priv, cb7210_page_in_bits(page), AUXMR);
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udelay(1);
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/* chip auto clears the page after a read */
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retval = fluke_read_byte_nolock(nec_priv, register_num);
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spin_unlock_irqrestore(&nec_priv->register_page_lock, flags);
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return retval;
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}
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static inline void fluke_paged_write_byte(struct fluke_priv *e_priv, u8 data,
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unsigned int register_num, unsigned int page)
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{
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struct nec7210_priv *nec_priv = &e_priv->nec7210_priv;
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unsigned long flags;
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spin_lock_irqsave(&nec_priv->register_page_lock, flags);
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fluke_write_byte_nolock(nec_priv, cb7210_page_in_bits(page), AUXMR);
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udelay(1);
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fluke_write_byte_nolock(nec_priv, data, register_num);
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spin_unlock_irqrestore(&nec_priv->register_page_lock, flags);
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}
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enum bus_status_bits {
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BSR_ATN_BIT = 0x1,
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BSR_EOI_BIT = 0x2,
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BSR_SRQ_BIT = 0x4,
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BSR_IFC_BIT = 0x8,
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BSR_REN_BIT = 0x10,
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BSR_DAV_BIT = 0x20,
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BSR_NRFD_BIT = 0x40,
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BSR_NDAC_BIT = 0x80,
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};
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enum cb7210_aux_cmds {
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/*
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* AUX_RTL2 is an undocumented aux command which causes cb7210 to assert
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* (and keep asserted) local rtl message. This is used in conjunction
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* with the (stupid) cb7210 implementation
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* of the normal nec7210 AUX_RTL aux command, which
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* causes the rtl message to toggle between on and off.
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*/
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AUX_RTL2 = 0xd,
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AUX_NBAF = 0xe, // new byte available false (also clears seoi)
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AUX_LO_SPEED = 0x40,
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AUX_HI_SPEED = 0x41,
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};
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enum {
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fluke_reg_offset = 4,
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fluke_num_regs = 8,
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write_transfer_counter_mask = 0x7ff,
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};
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