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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * PCI driver for the High Speed UART DMA
4 *
5 * Copyright (C) 2015 Intel Corporation
6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7 *
8 * Partially based on the bits found in drivers/tty/serial/mfd.c.
9 */
10
11#include <linux/bitops.h>
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/pci.h>
15
16#include "hsu.h"
17
18#define HSU_PCI_DMASR 0x00
19#define HSU_PCI_DMAISR 0x04
20
21#define HSU_PCI_CHAN_OFFSET 0x100
22
23#define PCI_DEVICE_ID_INTEL_MFLD_HSU_DMA 0x081e
24#define PCI_DEVICE_ID_INTEL_MRFLD_HSU_DMA 0x1192
25
26static irqreturn_t hsu_pci_irq(int irq, void *dev)
27{
28 struct hsu_dma_chip *chip = dev;
29 struct pci_dev *pdev = to_pci_dev(chip->dev);
30 u32 dmaisr;
31 u32 status;
32 unsigned short i;
33 int ret = 0;
34 int err;
35
36 /*
37 * On Intel Tangier B0 and Anniedale the interrupt line, disregarding
38 * to have different numbers, is shared between HSU DMA and UART IPs.
39 * Thus on such SoCs we are expecting that IRQ handler is called in
40 * UART driver only.
41 */
42 if (pdev->device == PCI_DEVICE_ID_INTEL_MRFLD_HSU_DMA)
43 return IRQ_HANDLED;
44
45 dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
46 for (i = 0; i < chip->hsu->nr_channels; i++) {
47 if (dmaisr & 0x1) {
48 err = hsu_dma_get_status(chip, i, &status);
49 if (err > 0)
50 ret |= 1;
51 else if (err == 0)
52 ret |= hsu_dma_do_irq(chip, i, status);
53 }
54 dmaisr >>= 1;
55 }
56
57 return IRQ_RETVAL(ret);
58}
59
60static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
61{
62 struct hsu_dma_chip *chip;
63 int ret;
64
65 ret = pcim_enable_device(pdev);
66 if (ret)
67 return ret;
68
69 ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
70 if (ret) {
71 dev_err(&pdev->dev, "I/O memory remapping failed\n");
72 return ret;
73 }
74
75 pci_set_master(pdev);
76 pci_try_set_mwi(pdev);
77
78 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
79 if (ret)
80 return ret;
81
82 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
83 if (ret)
84 return ret;
85
86 chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
87 if (!chip)
88 return -ENOMEM;
89
90 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
91 if (ret < 0)
92 return ret;
93
94 chip->dev = &pdev->dev;
95 chip->regs = pcim_iomap_table(pdev)[0];
96 chip->length = pci_resource_len(pdev, 0);
97 chip->offset = HSU_PCI_CHAN_OFFSET;
98 chip->irq = pci_irq_vector(pdev, 0);
99
100 ret = hsu_dma_probe(chip);
101 if (ret)
102 return ret;
103
104 ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip);
105 if (ret)
106 goto err_register_irq;
107
108 pci_set_drvdata(pdev, chip);
109
110 return 0;
111
112err_register_irq:
113 hsu_dma_remove(chip);
114 return ret;
115}
116
117static void hsu_pci_remove(struct pci_dev *pdev)
118{
119 struct hsu_dma_chip *chip = pci_get_drvdata(pdev);
120
121 free_irq(chip->irq, chip);
122 hsu_dma_remove(chip);
123}
124
125static const struct pci_device_id hsu_pci_id_table[] = {
126 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MFLD_HSU_DMA), 0 },
127 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MRFLD_HSU_DMA), 0 },
128 { }
129};
130MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
131
132static struct pci_driver hsu_pci_driver = {
133 .name = "hsu_dma_pci",
134 .id_table = hsu_pci_id_table,
135 .probe = hsu_pci_probe,
136 .remove = hsu_pci_remove,
137};
138
139module_pci_driver(hsu_pci_driver);
140
141MODULE_LICENSE("GPL v2");
142MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
143MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
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
26static 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->hsu->nr_channels; i++) {
35 if (dmaisr & 0x1)
36 ret |= hsu_dma_irq(chip, i);
37 dmaisr >>= 1;
38 }
39
40 return ret;
41}
42
43static 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
93err_register_irq:
94 hsu_dma_remove(chip);
95 return ret;
96}
97
98static 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
106static const struct pci_device_id hsu_pci_id_table[] = {
107 { PCI_VDEVICE(INTEL, 0x081e), 0 },
108 { PCI_VDEVICE(INTEL, 0x1192), 0 },
109 { }
110};
111MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
112
113static 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
120module_pci_driver(hsu_pci_driver);
121
122MODULE_LICENSE("GPL v2");
123MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
124MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");