mite.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3/*
  4 *	Hardware driver for NI Mite PCI interface chip,
  5 *	adapted from COMEDI
  6 *
  7 *	Copyright (C) 1997-8 David A. Schleef
  8 *	Copyright (C) 2002 Frank Mori Hess
  9 *
 10 *	The PCI-MIO E series driver was originally written by
 11 *	Tomasz Motylewski <...>, and ported to comedi by ds.
 12 *
 13 *	References for specifications:
 14 *
 15 *	   321747b.pdf  Register Level Programmer Manual (obsolete)
 16 *	   321747c.pdf  Register Level Programmer Manual (new)
 17 *	   DAQ-STC reference manual
 18 *
 19 *	Other possibly relevant info:
 20 *
 21 *	   320517c.pdf  User manual (obsolete)
 22 *	   320517f.pdf  User manual (new)
 23 *	   320889a.pdf  delete
 24 *	   320906c.pdf  maximum signal ratings
 25 *	   321066a.pdf  about 16x
 26 *	   321791a.pdf  discontinuation of at-mio-16e-10 rev. c
 27 *	   321808a.pdf  about at-mio-16e-10 rev P
 28 *	   321837a.pdf  discontinuation of at-mio-16de-10 rev d
 29 *	   321838a.pdf  about at-mio-16de-10 rev N
 30 */
 31
 32#include <linux/module.h>
 33#include <linux/kernel.h>
 34#include <linux/errno.h>
 35#include <linux/ioport.h>
 36#include <linux/delay.h>
 37#include <linux/mm.h>
 38#include <linux/interrupt.h>
 39#include <linux/pci.h>
 40#include <linux/io.h>
 41#include <linux/slab.h>
 42
 43#include "mite.h"
 44
 45#define PCI_MITE_SIZE		4096
 46#define PCI_DAQ_SIZE		4096
 47
 48struct mite_struct *mite_devices;
 49
 50#define TOP_OF_PAGE(x) ((x) | (~(PAGE_MASK)))
 51
 52void mite_init(void)
 53{
 54	struct pci_dev *pcidev;
 55	struct mite_struct *mite;
 56
 57	for (pcidev = pci_get_device(PCI_VENDOR_ID_NATINST, PCI_ANY_ID, NULL);
 58		pcidev;
 59		pcidev = pci_get_device(PCI_VENDOR_ID_NATINST, PCI_ANY_ID, pcidev)) {
 60		mite = kzalloc(sizeof(*mite), GFP_KERNEL);
 61		if (!mite)
 62			return;
 63
 64		mite->pcidev = pcidev;
 65		pci_dev_get(mite->pcidev);
 66		mite->next = mite_devices;
 67		mite_devices = mite;
 68	}
 69}
 70
 71int mite_setup(struct mite_struct *mite)
 72{
 73	u32 addr;
 74
 75	if (pci_enable_device(mite->pcidev)) {
 76		pr_err("mite: error enabling mite.\n");
 77		return -EIO;
 78	}
 79	pci_set_master(mite->pcidev);
 80	if (pci_request_regions(mite->pcidev, "mite")) {
 81		pr_err("mite: failed to request mite io regions.\n");
 82		return -EIO;
 83	}
 84	addr = pci_resource_start(mite->pcidev, 0);
 85	mite->mite_phys_addr = addr;
 86	mite->mite_io_addr = ioremap(addr, pci_resource_len(mite->pcidev, 0));
 87	if (!mite->mite_io_addr) {
 88		pr_err("mite: failed to remap mite io memory address.\n");
 89		return -ENOMEM;
 90	}
 91	addr = pci_resource_start(mite->pcidev, 1);
 92	mite->daq_phys_addr = addr;
 93	mite->daq_io_addr = ioremap(mite->daq_phys_addr, pci_resource_len(mite->pcidev, 1));
 94	if (!mite->daq_io_addr)	{
 95		pr_err("mite: failed to remap daq io memory address.\n");
 96		return -ENOMEM;
 97	}
 98	writel(mite->daq_phys_addr | WENAB, mite->mite_io_addr + MITE_IODWBSR);
 99	mite->used = 1;
100	return 0;
101}
102
103void mite_cleanup(void)
104{
105	struct mite_struct *mite, *next;
106
107	for (mite = mite_devices; mite; mite = next) {
108		next = mite->next;
109		if (mite->pcidev)
110			pci_dev_put(mite->pcidev);
111		kfree(mite);
112	}
113}
114
115void mite_unsetup(struct mite_struct *mite)
116{
117	if (!mite)
118		return;
119	if (mite->mite_io_addr)	{
120		iounmap(mite->mite_io_addr);
121		mite->mite_io_addr = NULL;
122	}
123	if (mite->daq_io_addr) {
124		iounmap(mite->daq_io_addr);
125		mite->daq_io_addr = NULL;
126	}
127	if (mite->mite_phys_addr) {
128		pci_release_regions(mite->pcidev);
129		pci_disable_device(mite->pcidev);
130		mite->mite_phys_addr = 0;
131	}
132	mite->used = 0;
133}