1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* PCI driver for the High Speed UART DMA
*
* Copyright (C) 2015 Intel Corporation
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*
* Partially based on the bits found in drivers/tty/serial/mfd.c.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pci.h>
#include "hsu.h"
#define HSU_PCI_DMASR 0x00
#define HSU_PCI_DMAISR 0x04
#define HSU_PCI_CHAN_OFFSET 0x100
static irqreturn_t hsu_pci_irq(int irq, void *dev)
{
struct hsu_dma_chip *chip = dev;
u32 dmaisr;
u32 status;
unsigned short i;
int ret = 0;
int err;
dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
for (i = 0; i < chip->hsu->nr_channels; i++) {
if (dmaisr & 0x1) {
err = hsu_dma_get_status(chip, i, &status);
if (err > 0)
ret |= 1;
else if (err == 0)
ret |= hsu_dma_do_irq(chip, i, status);
}
dmaisr >>= 1;
}
return IRQ_RETVAL(ret);
}
static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct hsu_dma_chip *chip;
int ret;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
if (ret) {
dev_err(&pdev->dev, "I/O memory remapping failed\n");
return ret;
}
pci_set_master(pdev);
pci_try_set_mwi(pdev);
ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (ret)
return ret;
ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (ret)
return ret;
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &pdev->dev;
chip->regs = pcim_iomap_table(pdev)[0];
chip->length = pci_resource_len(pdev, 0);
chip->offset = HSU_PCI_CHAN_OFFSET;
chip->irq = pdev->irq;
pci_enable_msi(pdev);
ret = hsu_dma_probe(chip);
if (ret)
return ret;
ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip);
if (ret)
goto err_register_irq;
pci_set_drvdata(pdev, chip);
return 0;
err_register_irq:
hsu_dma_remove(chip);
return ret;
}
static void hsu_pci_remove(struct pci_dev *pdev)
{
struct hsu_dma_chip *chip = pci_get_drvdata(pdev);
free_irq(chip->irq, chip);
hsu_dma_remove(chip);
}
static const struct pci_device_id hsu_pci_id_table[] = {
{ PCI_VDEVICE(INTEL, 0x081e), 0 },
{ PCI_VDEVICE(INTEL, 0x1192), 0 },
{ }
};
MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
static struct pci_driver hsu_pci_driver = {
.name = "hsu_dma_pci",
.id_table = hsu_pci_id_table,
.probe = hsu_pci_probe,
.remove = hsu_pci_remove,
};
module_pci_driver(hsu_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
|
