xref: /openbmc/linux/drivers/dma/dw/pci.c (revision 1365e117)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * PCI driver for the Synopsys DesignWare DMA Controller
4  *
5  * Copyright (C) 2013 Intel Corporation
6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7  */
8 
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/device.h>
12 
13 #include "internal.h"
14 
dw_pci_probe(struct pci_dev * pdev,const struct pci_device_id * pid)15 static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
16 {
17 	const struct dw_dma_chip_pdata *drv_data = (void *)pid->driver_data;
18 	struct dw_dma_chip_pdata *data;
19 	struct dw_dma_chip *chip;
20 	int ret;
21 
22 	ret = pcim_enable_device(pdev);
23 	if (ret)
24 		return ret;
25 
26 	ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
27 	if (ret) {
28 		dev_err(&pdev->dev, "I/O memory remapping failed\n");
29 		return ret;
30 	}
31 
32 	pci_set_master(pdev);
33 	pci_try_set_mwi(pdev);
34 
35 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
36 	if (ret)
37 		return ret;
38 
39 	data = devm_kmemdup(&pdev->dev, drv_data, sizeof(*drv_data), GFP_KERNEL);
40 	if (!data)
41 		return -ENOMEM;
42 
43 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
44 	if (!chip)
45 		return -ENOMEM;
46 
47 	chip->dev = &pdev->dev;
48 	chip->id = pdev->devfn;
49 	chip->regs = pcim_iomap_table(pdev)[0];
50 	chip->irq = pdev->irq;
51 	chip->pdata = data->pdata;
52 
53 	data->chip = chip;
54 
55 	ret = data->probe(chip);
56 	if (ret)
57 		return ret;
58 
59 	dw_dma_acpi_controller_register(chip->dw);
60 
61 	pci_set_drvdata(pdev, data);
62 
63 	return 0;
64 }
65 
dw_pci_remove(struct pci_dev * pdev)66 static void dw_pci_remove(struct pci_dev *pdev)
67 {
68 	struct dw_dma_chip_pdata *data = pci_get_drvdata(pdev);
69 	struct dw_dma_chip *chip = data->chip;
70 	int ret;
71 
72 	dw_dma_acpi_controller_free(chip->dw);
73 
74 	ret = data->remove(chip);
75 	if (ret)
76 		dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);
77 }
78 
79 #ifdef CONFIG_PM_SLEEP
80 
dw_pci_suspend_late(struct device * dev)81 static int dw_pci_suspend_late(struct device *dev)
82 {
83 	struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
84 	struct dw_dma_chip *chip = data->chip;
85 
86 	return do_dw_dma_disable(chip);
87 };
88 
dw_pci_resume_early(struct device * dev)89 static int dw_pci_resume_early(struct device *dev)
90 {
91 	struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
92 	struct dw_dma_chip *chip = data->chip;
93 
94 	return do_dw_dma_enable(chip);
95 };
96 
97 #endif /* CONFIG_PM_SLEEP */
98 
99 static const struct dev_pm_ops dw_pci_dev_pm_ops = {
100 	SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early)
101 };
102 
103 static const struct pci_device_id dw_pci_id_table[] = {
104 	/* Medfield (GPDMA) */
105 	{ PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_dma_chip_pdata },
106 
107 	/* BayTrail */
108 	{ PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_dma_chip_pdata },
109 	{ PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_dma_chip_pdata },
110 
111 	/* Merrifield */
112 	{ PCI_VDEVICE(INTEL, 0x11a2), (kernel_ulong_t)&idma32_chip_pdata },
113 
114 	/* Braswell */
115 	{ PCI_VDEVICE(INTEL, 0x2286), (kernel_ulong_t)&dw_dma_chip_pdata },
116 	{ PCI_VDEVICE(INTEL, 0x22c0), (kernel_ulong_t)&dw_dma_chip_pdata },
117 
118 	/* Elkhart Lake iDMA 32-bit (PSE DMA) */
119 	{ PCI_VDEVICE(INTEL, 0x4bb4), (kernel_ulong_t)&xbar_chip_pdata },
120 	{ PCI_VDEVICE(INTEL, 0x4bb5), (kernel_ulong_t)&xbar_chip_pdata },
121 	{ PCI_VDEVICE(INTEL, 0x4bb6), (kernel_ulong_t)&xbar_chip_pdata },
122 
123 	/* Haswell */
124 	{ PCI_VDEVICE(INTEL, 0x9c60), (kernel_ulong_t)&dw_dma_chip_pdata },
125 
126 	/* Broadwell */
127 	{ PCI_VDEVICE(INTEL, 0x9ce0), (kernel_ulong_t)&dw_dma_chip_pdata },
128 
129 	{ }
130 };
131 MODULE_DEVICE_TABLE(pci, dw_pci_id_table);
132 
133 static struct pci_driver dw_pci_driver = {
134 	.name		= "dw_dmac_pci",
135 	.id_table	= dw_pci_id_table,
136 	.probe		= dw_pci_probe,
137 	.remove		= dw_pci_remove,
138 	.driver	= {
139 		.pm	= &dw_pci_dev_pm_ops,
140 	},
141 };
142 
143 module_pci_driver(dw_pci_driver);
144 
145 MODULE_LICENSE("GPL v2");
146 MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");
147 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
148