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, from: pcidev)) {
60 mite = kzalloc(sizeof(*mite), GFP_KERNEL);
61 if (!mite)
62 return;
63
64 mite->pcidev = pcidev;
65 pci_dev_get(dev: 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(dev: mite->pcidev)) {
76 pr_err("mite: error enabling mite.\n");
77 return -EIO;
78 }
79 pci_set_master(dev: 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(offset: 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(offset: 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(val: mite->daq_phys_addr | WENAB, addr: 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(dev: mite->pcidev);
111 kfree(objp: 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(addr: mite->mite_io_addr);
121 mite->mite_io_addr = NULL;
122 }
123 if (mite->daq_io_addr) {
124 iounmap(addr: 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(dev: mite->pcidev);
130 mite->mite_phys_addr = 0;
131 }
132 mite->used = 0;
133}
134

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source code of linux/drivers/staging/gpib/tnt4882/mite.c