2 * Generic platform device PATA driver
4 * Copyright (C) 2006 - 2007 Paul Mundt
6 * Based on pata_pcmcia:
8 * Copyright 2005-2006 Red Hat Inc, all rights reserved.
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
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/blkdev.h>
18 #include <scsi/scsi_host.h>
19 #include <linux/ata.h>
20 #include <linux/libata.h>
21 #include <linux/platform_device.h>
22 #include <linux/ata_platform.h>
24 #define DRV_NAME "pata_platform"
25 #define DRV_VERSION "1.2"
27 static int pio_mask = 1;
30 * Provide our own set_mode() as we don't want to change anything that has
31 * already been configured..
33 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
35 struct ata_device *dev;
37 ata_for_each_dev(dev, link, ENABLED) {
38 /* We don't really care */
39 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
40 dev->xfer_shift = ATA_SHIFT_PIO;
41 dev->flags |= ATA_DFLAG_PIO;
42 ata_dev_info(dev, "configured for PIO\n");
47 static struct scsi_host_template pata_platform_sht = {
48 ATA_PIO_SHT(DRV_NAME),
51 static struct ata_port_operations pata_platform_port_ops = {
52 .inherits = &ata_sff_port_ops,
53 .sff_data_xfer = ata_sff_data_xfer_noirq,
54 .cable_detect = ata_cable_unknown,
55 .set_mode = pata_platform_set_mode,
58 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
61 /* Fixup the port shift for platforms that need it */
62 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
63 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
64 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
65 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
66 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
67 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
68 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
69 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
70 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
71 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
75 * __pata_platform_probe - attach a platform interface
77 * @io_res: Resource representing I/O base
78 * @ctl_res: Resource representing CTL base
79 * @irq_res: Resource representing IRQ and its flags
80 * @ioport_shift: I/O port shift
81 * @__pio_mask: PIO mask
83 * Register a platform bus IDE interface. Such interfaces are PIO and we
84 * assume do not support IRQ sharing.
86 * Platform devices are expected to contain at least 2 resources per port:
88 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
89 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
93 * - IRQ (IORESOURCE_IRQ)
95 * If the base resources are both mem types, the ioremap() is handled
96 * here. For IORESOURCE_IO, it's assumed that there's no remapping
99 * If no IRQ resource is present, PIO polling mode is used instead.
101 int __pata_platform_probe(struct device *dev, struct resource *io_res,
102 struct resource *ctl_res, struct resource *irq_res,
103 unsigned int ioport_shift, int __pio_mask)
105 struct ata_host *host;
114 mmio = (( io_res->flags == IORESOURCE_MEM) &&
115 (ctl_res->flags == IORESOURCE_MEM));
120 if (irq_res && irq_res->start > 0) {
121 irq = irq_res->start;
122 irq_flags = irq_res->flags;
126 * Now that that's out of the way, wire up the port..
128 host = ata_host_alloc(dev, 1);
133 ap->ops = &pata_platform_port_ops;
134 ap->pio_mask = __pio_mask;
135 ap->flags |= ATA_FLAG_SLAVE_POSS;
138 * Use polling mode if there's no IRQ
141 ap->flags |= ATA_FLAG_PIO_POLLING;
142 ata_port_desc(ap, "no IRQ, using PIO polling");
146 * Handle the MMIO case
149 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
150 resource_size(io_res));
151 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
152 resource_size(ctl_res));
154 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
155 resource_size(io_res));
156 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
157 resource_size(ctl_res));
159 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
160 dev_err(dev, "failed to map IO/CTL base\n");
164 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
166 pata_platform_setup_port(&ap->ioaddr, ioport_shift);
168 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
169 (unsigned long long)io_res->start,
170 (unsigned long long)ctl_res->start);
173 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
174 irq_flags, &pata_platform_sht);
176 EXPORT_SYMBOL_GPL(__pata_platform_probe);
178 static int pata_platform_probe(struct platform_device *pdev)
180 struct resource *io_res;
181 struct resource *ctl_res;
182 struct resource *irq_res;
183 struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
186 * Simple resource validation ..
188 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
189 dev_err(&pdev->dev, "invalid number of resources\n");
194 * Get the I/O base first
196 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
197 if (io_res == NULL) {
198 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
199 if (unlikely(io_res == NULL))
206 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
207 if (ctl_res == NULL) {
208 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
209 if (unlikely(ctl_res == NULL))
216 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
218 irq_res->flags = pp_info ? pp_info->irq_flags : 0;
220 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
221 pp_info ? pp_info->ioport_shift : 0,
225 static struct platform_driver pata_platform_driver = {
226 .probe = pata_platform_probe,
227 .remove = ata_platform_remove_one,
230 .owner = THIS_MODULE,
234 module_platform_driver(pata_platform_driver);
236 module_param(pio_mask, int, 0);
238 MODULE_AUTHOR("Paul Mundt");
239 MODULE_DESCRIPTION("low-level driver for platform device ATA");
240 MODULE_LICENSE("GPL");
241 MODULE_VERSION(DRV_VERSION);
242 MODULE_ALIAS("platform:" DRV_NAME);