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 <alan@redhat.com>, 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_link_for_each_dev(dev, link) {
38 if (ata_dev_enabled(dev)) {
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_printk(dev, KERN_INFO, "configured for PIO\n");
49 static struct scsi_host_template pata_platform_sht = {
50 ATA_PIO_SHT(DRV_NAME),
53 static struct ata_port_operations pata_platform_port_ops = {
54 .inherits = &ata_sff_port_ops,
55 .sff_data_xfer = ata_sff_data_xfer_noirq,
56 .cable_detect = ata_cable_unknown,
57 .set_mode = pata_platform_set_mode,
58 .port_start = ATA_OP_NULL,
61 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
64 /* Fixup the port shift for platforms that need it */
65 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
66 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
67 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
68 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
69 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
70 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
71 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
72 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
73 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
74 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
78 * __pata_platform_probe - attach a platform interface
80 * @io_res: Resource representing I/O base
81 * @ctl_res: Resource representing CTL base
82 * @irq_res: Resource representing IRQ and its flags
83 * @ioport_shift: I/O port shift
84 * @__pio_mask: PIO mask
86 * Register a platform bus IDE interface. Such interfaces are PIO and we
87 * assume do not support IRQ sharing.
89 * Platform devices are expected to contain at least 2 resources per port:
91 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
92 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
96 * - IRQ (IORESOURCE_IRQ)
98 * If the base resources are both mem types, the ioremap() is handled
99 * here. For IORESOURCE_IO, it's assumed that there's no remapping
102 * If no IRQ resource is present, PIO polling mode is used instead.
104 int __devinit __pata_platform_probe(struct device *dev,
105 struct resource *io_res,
106 struct resource *ctl_res,
107 struct resource *irq_res,
108 unsigned int ioport_shift,
111 struct ata_host *host;
120 mmio = (( io_res->flags == IORESOURCE_MEM) &&
121 (ctl_res->flags == IORESOURCE_MEM));
126 if (irq_res && irq_res->start > 0) {
127 irq = irq_res->start;
128 irq_flags = irq_res->flags;
132 * Now that that's out of the way, wire up the port..
134 host = ata_host_alloc(dev, 1);
139 ap->ops = &pata_platform_port_ops;
140 ap->pio_mask = __pio_mask;
141 ap->flags |= ATA_FLAG_SLAVE_POSS;
144 * Use polling mode if there's no IRQ
147 ap->flags |= ATA_FLAG_PIO_POLLING;
148 ata_port_desc(ap, "no IRQ, using PIO polling");
152 * Handle the MMIO case
155 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
156 io_res->end - io_res->start + 1);
157 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
158 ctl_res->end - ctl_res->start + 1);
160 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
161 io_res->end - io_res->start + 1);
162 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
163 ctl_res->end - ctl_res->start + 1);
165 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
166 dev_err(dev, "failed to map IO/CTL base\n");
170 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
172 pata_platform_setup_port(&ap->ioaddr, ioport_shift);
174 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
175 (unsigned long long)io_res->start,
176 (unsigned long long)ctl_res->start);
179 return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
180 irq_flags, &pata_platform_sht);
182 EXPORT_SYMBOL_GPL(__pata_platform_probe);
185 * __pata_platform_remove - unplug a platform interface
188 * A platform bus ATA device has been unplugged. Perform the needed
189 * cleanup. Also called on module unload for any active devices.
191 int __devexit __pata_platform_remove(struct device *dev)
193 struct ata_host *host = dev_get_drvdata(dev);
195 ata_host_detach(host);
199 EXPORT_SYMBOL_GPL(__pata_platform_remove);
201 static int __devinit pata_platform_probe(struct platform_device *pdev)
203 struct resource *io_res;
204 struct resource *ctl_res;
205 struct resource *irq_res;
206 struct pata_platform_info *pp_info = pdev->dev.platform_data;
209 * Simple resource validation ..
211 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
212 dev_err(&pdev->dev, "invalid number of resources\n");
217 * Get the I/O base first
219 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
220 if (io_res == NULL) {
221 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
222 if (unlikely(io_res == NULL))
229 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
230 if (ctl_res == NULL) {
231 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
232 if (unlikely(ctl_res == NULL))
239 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
241 irq_res->flags = pp_info ? pp_info->irq_flags : 0;
243 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
244 pp_info ? pp_info->ioport_shift : 0,
248 static int __devexit pata_platform_remove(struct platform_device *pdev)
250 return __pata_platform_remove(&pdev->dev);
253 static struct platform_driver pata_platform_driver = {
254 .probe = pata_platform_probe,
255 .remove = __devexit_p(pata_platform_remove),
258 .owner = THIS_MODULE,
262 static int __init pata_platform_init(void)
264 return platform_driver_register(&pata_platform_driver);
267 static void __exit pata_platform_exit(void)
269 platform_driver_unregister(&pata_platform_driver);
271 module_init(pata_platform_init);
272 module_exit(pata_platform_exit);
274 module_param(pio_mask, int, 0);
276 MODULE_AUTHOR("Paul Mundt");
277 MODULE_DESCRIPTION("low-level driver for platform device ATA");
278 MODULE_LICENSE("GPL");
279 MODULE_VERSION(DRV_VERSION);
280 MODULE_ALIAS("platform:" DRV_NAME);