1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Platform IDE driver
4 *
5 * Copyright (C) 2007 MontaVista Software
6 *
7 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
8 */
9
10#include <linux/types.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/ide.h>
14#include <linux/ioport.h>
15#include <linux/module.h>
16#include <linux/ata_platform.h>
17#include <linux/platform_device.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20
21static void plat_ide_setup_ports(struct ide_hw *hw, void __iomem *base,
22				 void __iomem *ctrl,
23				 struct pata_platform_info *pdata, int irq)
24{
25	unsigned long port = (unsigned long)base;
26	int i;
27
28	hw->io_ports.data_addr = port;
29
30	port += (1 << pdata->ioport_shift);
31	for (i = 1; i <= 7;
32	     i++, port += (1 << pdata->ioport_shift))
33		hw->io_ports_array[i] = port;
34
35	hw->io_ports.ctl_addr = (unsigned long)ctrl;
36
37	hw->irq = irq;
38}
39
40static const struct ide_port_info platform_ide_port_info = {
41	.host_flags		= IDE_HFLAG_NO_DMA,
42	.chipset		= ide_generic,
43};
44
45static int plat_ide_probe(struct platform_device *pdev)
46{
47	struct resource *res_base, *res_alt, *res_irq;
48	void __iomem *base, *alt_base;
49	struct pata_platform_info *pdata;
50	struct ide_host *host;
51	int ret = 0, mmio = 0;
52	struct ide_hw hw, *hws[] = { &hw };
53	struct ide_port_info d = platform_ide_port_info;
54
55	pdata = dev_get_platdata(&pdev->dev);
56
57	/* get a pointer to the register memory */
58	res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
59	res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
60
61	if (!res_base || !res_alt) {
62		res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
63		res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
64		if (!res_base || !res_alt) {
65			ret = -ENOMEM;
66			goto out;
67		}
68		mmio = 1;
69	}
70
71	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
72	if (!res_irq) {
73		ret = -EINVAL;
74		goto out;
75	}
76
77	if (mmio) {
78		base = devm_ioremap(&pdev->dev,
79			res_base->start, resource_size(res_base));
80		alt_base = devm_ioremap(&pdev->dev,
81			res_alt->start, resource_size(res_alt));
82	} else {
83		base = devm_ioport_map(&pdev->dev,
84			res_base->start, resource_size(res_base));
85		alt_base = devm_ioport_map(&pdev->dev,
86			res_alt->start, resource_size(res_alt));
87	}
88
89	memset(&hw, 0, sizeof(hw));
90	plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
91	hw.dev = &pdev->dev;
92
93	d.irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;
94	if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)
95		d.irq_flags |= IRQF_SHARED;
96
97	if (mmio)
98		d.host_flags |= IDE_HFLAG_MMIO;
99
100	ret = ide_host_add(&d, hws, 1, &host);
101	if (ret)
102		goto out;
103
104	platform_set_drvdata(pdev, host);
105
106	return 0;
107
108out:
109	return ret;
110}
111
112static int plat_ide_remove(struct platform_device *pdev)
113{
114	struct ide_host *host = dev_get_drvdata(&pdev->dev);
115
116	ide_host_remove(host);
117
118	return 0;
119}
120
121static struct platform_driver platform_ide_driver = {
122	.driver = {
123		.name = "pata_platform",
124	},
125	.probe = plat_ide_probe,
126	.remove = plat_ide_remove,
127};
128
129module_platform_driver(platform_ide_driver);
130
131MODULE_DESCRIPTION("Platform IDE driver");
132MODULE_LICENSE("GPL");
133MODULE_ALIAS("platform:pata_platform");
134