diff options
Diffstat (limited to 'drivers/dma/hsu/pci.c')
-rw-r--r-- | drivers/dma/hsu/pci.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c new file mode 100644 index 000000000000..77879e6ddc4c --- /dev/null +++ b/drivers/dma/hsu/pci.c | |||
@@ -0,0 +1,124 @@ | |||
1 | /* | ||
2 | * PCI driver for the High Speed UART DMA | ||
3 | * | ||
4 | * Copyright (C) 2015 Intel Corporation | ||
5 | * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> | ||
6 | * | ||
7 | * Partially based on the bits found in drivers/tty/serial/mfd.c. | ||
8 | * | ||
9 | * This program is free software; you can redistribute it and/or modify | ||
10 | * it under the terms of the GNU General Public License version 2 as | ||
11 | * published by the Free Software Foundation. | ||
12 | */ | ||
13 | |||
14 | #include <linux/bitops.h> | ||
15 | #include <linux/device.h> | ||
16 | #include <linux/module.h> | ||
17 | #include <linux/pci.h> | ||
18 | |||
19 | #include "hsu.h" | ||
20 | |||
21 | #define HSU_PCI_DMASR 0x00 | ||
22 | #define HSU_PCI_DMAISR 0x04 | ||
23 | |||
24 | #define HSU_PCI_CHAN_OFFSET 0x100 | ||
25 | |||
26 | static irqreturn_t hsu_pci_irq(int irq, void *dev) | ||
27 | { | ||
28 | struct hsu_dma_chip *chip = dev; | ||
29 | u32 dmaisr; | ||
30 | unsigned short i; | ||
31 | irqreturn_t ret = IRQ_NONE; | ||
32 | |||
33 | dmaisr = readl(chip->regs + HSU_PCI_DMAISR); | ||
34 | for (i = 0; i < chip->pdata->nr_channels; i++) { | ||
35 | if (dmaisr & 0x1) | ||
36 | ret |= hsu_dma_irq(chip, i); | ||
37 | dmaisr >>= 1; | ||
38 | } | ||
39 | |||
40 | return ret; | ||
41 | } | ||
42 | |||
43 | static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) | ||
44 | { | ||
45 | struct hsu_dma_chip *chip; | ||
46 | int ret; | ||
47 | |||
48 | ret = pcim_enable_device(pdev); | ||
49 | if (ret) | ||
50 | return ret; | ||
51 | |||
52 | ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev)); | ||
53 | if (ret) { | ||
54 | dev_err(&pdev->dev, "I/O memory remapping failed\n"); | ||
55 | return ret; | ||
56 | } | ||
57 | |||
58 | pci_set_master(pdev); | ||
59 | pci_try_set_mwi(pdev); | ||
60 | |||
61 | ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); | ||
62 | if (ret) | ||
63 | return ret; | ||
64 | |||
65 | ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); | ||
66 | if (ret) | ||
67 | return ret; | ||
68 | |||
69 | chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); | ||
70 | if (!chip) | ||
71 | return -ENOMEM; | ||
72 | |||
73 | chip->dev = &pdev->dev; | ||
74 | chip->regs = pcim_iomap_table(pdev)[0]; | ||
75 | chip->length = pci_resource_len(pdev, 0); | ||
76 | chip->offset = HSU_PCI_CHAN_OFFSET; | ||
77 | chip->irq = pdev->irq; | ||
78 | |||
79 | pci_enable_msi(pdev); | ||
80 | |||
81 | ret = hsu_dma_probe(chip); | ||
82 | if (ret) | ||
83 | return ret; | ||
84 | |||
85 | ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip); | ||
86 | if (ret) | ||
87 | goto err_register_irq; | ||
88 | |||
89 | pci_set_drvdata(pdev, chip); | ||
90 | |||
91 | return 0; | ||
92 | |||
93 | err_register_irq: | ||
94 | hsu_dma_remove(chip); | ||
95 | return ret; | ||
96 | } | ||
97 | |||
98 | static void hsu_pci_remove(struct pci_dev *pdev) | ||
99 | { | ||
100 | struct hsu_dma_chip *chip = pci_get_drvdata(pdev); | ||
101 | |||
102 | free_irq(chip->irq, chip); | ||
103 | hsu_dma_remove(chip); | ||
104 | } | ||
105 | |||
106 | static const struct pci_device_id hsu_pci_id_table[] = { | ||
107 | { PCI_VDEVICE(INTEL, 0x081e), 0 }, | ||
108 | { PCI_VDEVICE(INTEL, 0x1192), 0 }, | ||
109 | { } | ||
110 | }; | ||
111 | MODULE_DEVICE_TABLE(pci, hsu_pci_id_table); | ||
112 | |||
113 | static struct pci_driver hsu_pci_driver = { | ||
114 | .name = "hsu_dma_pci", | ||
115 | .id_table = hsu_pci_id_table, | ||
116 | .probe = hsu_pci_probe, | ||
117 | .remove = hsu_pci_remove, | ||
118 | }; | ||
119 | |||
120 | module_pci_driver(hsu_pci_driver); | ||
121 | |||
122 | MODULE_LICENSE("GPL v2"); | ||
123 | MODULE_DESCRIPTION("High Speed UART DMA PCI driver"); | ||
124 | MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); | ||