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1/*
2 * Generic platform device PATA driver
3 *
4 * Copyright (C) 2006 - 2007 Paul Mundt
5 *
6 * Based on pata_pcmcia:
7 *
8 * Copyright 2005-2006 Red Hat Inc, all rights reserved.
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
12 * for more details.
13 */
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/blkdev.h>
17#include <scsi/scsi_host.h>
18#include <linux/ata.h>
19#include <linux/libata.h>
20#include <linux/platform_device.h>
21#include <linux/ata_platform.h>
22
23#define DRV_NAME "pata_platform"
24#define DRV_VERSION "1.2"
25
26static int pio_mask = 1;
27module_param(pio_mask, int, 0);
28MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default");
29
30/*
31 * Provide our own set_mode() as we don't want to change anything that has
32 * already been configured..
33 */
34static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
35{
36 struct ata_device *dev;
37
38 ata_for_each_dev(dev, link, ENABLED) {
39 /* We don't really care */
40 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
41 dev->xfer_shift = ATA_SHIFT_PIO;
42 dev->flags |= ATA_DFLAG_PIO;
43 ata_dev_info(dev, "configured for PIO\n");
44 }
45 return 0;
46}
47
48static const struct scsi_host_template pata_platform_sht = {
49 ATA_PIO_SHT(DRV_NAME),
50};
51
52static void pata_platform_setup_port(struct ata_ioports *ioaddr,
53 unsigned int shift)
54{
55 /* Fixup the port shift for platforms that need it */
56 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
57 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
58 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
59 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
60 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
61 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
62 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
63 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
64 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
65 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
66}
67
68/**
69 * __pata_platform_probe - attach a platform interface
70 * @dev: device
71 * @io_res: Resource representing I/O base
72 * @ctl_res: Resource representing CTL base
73 * @irq_res: Resource representing IRQ and its flags
74 * @ioport_shift: I/O port shift
75 * @__pio_mask: PIO mask
76 * @sht: scsi_host_template to use when registering
77 * @use16bit: Flag to indicate 16-bit IO instead of 32-bit
78 *
79 * Register a platform bus IDE interface. Such interfaces are PIO and we
80 * assume do not support IRQ sharing.
81 *
82 * Platform devices are expected to contain at least 2 resources per port:
83 *
84 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
85 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
86 *
87 * and optionally:
88 *
89 * - IRQ (IORESOURCE_IRQ)
90 *
91 * If the base resources are both mem types, the ioremap() is handled
92 * here. For IORESOURCE_IO, it's assumed that there's no remapping
93 * necessary.
94 *
95 * If no IRQ resource is present, PIO polling mode is used instead.
96 */
97int __pata_platform_probe(struct device *dev, struct resource *io_res,
98 struct resource *ctl_res, struct resource *irq_res,
99 unsigned int ioport_shift, int __pio_mask,
100 const struct scsi_host_template *sht, bool use16bit)
101{
102 struct ata_host *host;
103 struct ata_port *ap;
104 unsigned int mmio;
105 int irq = 0;
106 int irq_flags = 0;
107
108 /*
109 * Check for MMIO
110 */
111 mmio = (( io_res->flags == IORESOURCE_MEM) &&
112 (ctl_res->flags == IORESOURCE_MEM));
113
114 /*
115 * And the IRQ
116 */
117 if (irq_res && irq_res->start > 0) {
118 irq = irq_res->start;
119 irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
120 }
121
122 /*
123 * Now that that's out of the way, wire up the port..
124 */
125 host = ata_host_alloc(dev, 1);
126 if (!host)
127 return -ENOMEM;
128 ap = host->ports[0];
129
130 ap->ops = devm_kzalloc(dev, sizeof(*ap->ops), GFP_KERNEL);
131 if (!ap->ops)
132 return -ENOMEM;
133 ap->ops->inherits = &ata_sff_port_ops;
134 ap->ops->cable_detect = ata_cable_unknown;
135 ap->ops->set_mode = pata_platform_set_mode;
136 if (use16bit)
137 ap->ops->sff_data_xfer = ata_sff_data_xfer;
138 else
139 ap->ops->sff_data_xfer = ata_sff_data_xfer32;
140
141 ap->pio_mask = __pio_mask;
142 ap->flags |= ATA_FLAG_SLAVE_POSS;
143
144 /*
145 * Use polling mode if there's no IRQ
146 */
147 if (!irq) {
148 ap->flags |= ATA_FLAG_PIO_POLLING;
149 ata_port_desc(ap, "no IRQ, using PIO polling");
150 }
151
152 /*
153 * Handle the MMIO case
154 */
155 if (mmio) {
156 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
157 resource_size(io_res));
158 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
159 resource_size(ctl_res));
160 } else {
161 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
162 resource_size(io_res));
163 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
164 resource_size(ctl_res));
165 }
166 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
167 dev_err(dev, "failed to map IO/CTL base\n");
168 return -ENOMEM;
169 }
170
171 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
172
173 pata_platform_setup_port(&ap->ioaddr, ioport_shift);
174
175 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
176 (unsigned long long)io_res->start,
177 (unsigned long long)ctl_res->start);
178
179 /* activate */
180 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
181 irq_flags, sht);
182}
183EXPORT_SYMBOL_GPL(__pata_platform_probe);
184
185static int pata_platform_probe(struct platform_device *pdev)
186{
187 struct resource *io_res;
188 struct resource *ctl_res;
189 struct resource *irq_res;
190 struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
191
192 /*
193 * Simple resource validation ..
194 */
195 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
196 dev_err(&pdev->dev, "invalid number of resources\n");
197 return -EINVAL;
198 }
199
200 /*
201 * Get the I/O base first
202 */
203 io_res = platform_get_mem_or_io(pdev, 0);
204 if (!io_res)
205 return -EINVAL;
206
207 /*
208 * Then the CTL base
209 */
210 ctl_res = platform_get_mem_or_io(pdev, 1);
211 if (!ctl_res)
212 return -EINVAL;
213
214 /*
215 * And the IRQ
216 */
217 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
218
219 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
220 pp_info ? pp_info->ioport_shift : 0,
221 pio_mask, &pata_platform_sht, false);
222}
223
224static struct platform_driver pata_platform_driver = {
225 .probe = pata_platform_probe,
226 .remove = ata_platform_remove_one,
227 .driver = {
228 .name = DRV_NAME,
229 },
230};
231
232module_platform_driver(pata_platform_driver);
233
234MODULE_AUTHOR("Paul Mundt");
235MODULE_DESCRIPTION("low-level driver for platform device ATA");
236MODULE_LICENSE("GPL");
237MODULE_VERSION(DRV_VERSION);
238MODULE_ALIAS("platform:" DRV_NAME);