xref: /openbmc/linux/drivers/dma/dw/pci.c (revision b34e08d5)
1 /*
2  * PCI driver for the Synopsys DesignWare DMA Controller
3  *
4  * Copyright (C) 2013 Intel Corporation
5  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/device.h>
15 
16 #include "internal.h"
17 
18 static struct dw_dma_platform_data dw_pci_pdata = {
19 	.is_private = 1,
20 	.chan_allocation_order = CHAN_ALLOCATION_ASCENDING,
21 	.chan_priority = CHAN_PRIORITY_ASCENDING,
22 };
23 
24 static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
25 {
26 	struct dw_dma_chip *chip;
27 	struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
28 	int ret;
29 
30 	ret = pcim_enable_device(pdev);
31 	if (ret)
32 		return ret;
33 
34 	ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
35 	if (ret) {
36 		dev_err(&pdev->dev, "I/O memory remapping failed\n");
37 		return ret;
38 	}
39 
40 	pci_set_master(pdev);
41 	pci_try_set_mwi(pdev);
42 
43 	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
44 	if (ret)
45 		return ret;
46 
47 	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
48 	if (ret)
49 		return ret;
50 
51 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
52 	if (!chip)
53 		return -ENOMEM;
54 
55 	chip->dev = &pdev->dev;
56 	chip->regs = pcim_iomap_table(pdev)[0];
57 	chip->irq = pdev->irq;
58 
59 	ret = dw_dma_probe(chip, pdata);
60 	if (ret)
61 		return ret;
62 
63 	pci_set_drvdata(pdev, chip);
64 
65 	return 0;
66 }
67 
68 static void dw_pci_remove(struct pci_dev *pdev)
69 {
70 	struct dw_dma_chip *chip = pci_get_drvdata(pdev);
71 	int ret;
72 
73 	ret = dw_dma_remove(chip);
74 	if (ret)
75 		dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
76 }
77 
78 #ifdef CONFIG_PM_SLEEP
79 
80 static int dw_pci_suspend_late(struct device *dev)
81 {
82 	struct pci_dev *pci = to_pci_dev(dev);
83 	struct dw_dma_chip *chip = pci_get_drvdata(pci);
84 
85 	return dw_dma_suspend(chip);
86 };
87 
88 static int dw_pci_resume_early(struct device *dev)
89 {
90 	struct pci_dev *pci = to_pci_dev(dev);
91 	struct dw_dma_chip *chip = pci_get_drvdata(pci);
92 
93 	return dw_dma_resume(chip);
94 };
95 
96 #else /* !CONFIG_PM_SLEEP */
97 
98 #define dw_pci_suspend_late	NULL
99 #define dw_pci_resume_early	NULL
100 
101 #endif /* !CONFIG_PM_SLEEP */
102 
103 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
104 	.suspend_late = dw_pci_suspend_late,
105 	.resume_early = dw_pci_resume_early,
106 };
107 
108 static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {
109 	/* Medfield */
110 	{ PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },
111 	{ PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata },
112 
113 	/* BayTrail */
114 	{ PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata },
115 	{ PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_pdata },
116 
117 	/* Haswell */
118 	{ PCI_VDEVICE(INTEL, 0x9c60), (kernel_ulong_t)&dw_pci_pdata },
119 	{ }
120 };
121 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
122 
123 static struct pci_driver dw_pci_driver = {
124 	.name		= "dw_dmac_pci",
125 	.id_table	= dw_pci_id_table,
126 	.probe		= dw_pci_probe,
127 	.remove		= dw_pci_remove,
128 	.driver	= {
129 		.pm	= &dw_pci_dev_pm_ops,
130 	},
131 };
132 
133 module_pci_driver(dw_pci_driver);
134 
135 MODULE_LICENSE("GPL v2");
136 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
137 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
138