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 .set_mode = pata_platform_set_mode,
56 .tf_load = ata_tf_load,
57 .tf_read = ata_tf_read,
58 .check_status = ata_check_status,
59 .exec_command = ata_exec_command,
60 .dev_select = ata_std_dev_select,
62 .freeze = ata_bmdma_freeze,
63 .thaw = ata_bmdma_thaw,
64 .error_handler = ata_bmdma_error_handler,
65 .post_internal_cmd = ata_bmdma_post_internal_cmd,
66 .cable_detect = ata_cable_unknown,
68 .qc_prep = ata_qc_prep,
69 .qc_issue = ata_qc_issue_prot,
71 .data_xfer = ata_data_xfer_noirq,
73 .irq_clear = ata_noop_irq_clear,
77 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
80 /* Fixup the port shift for platforms that need it */
81 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
82 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
83 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
84 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
85 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
86 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
87 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
88 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
89 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
90 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
94 * __pata_platform_probe - attach a platform interface
96 * @io_res: Resource representing I/O base
97 * @ctl_res: Resource representing CTL base
98 * @irq_res: Resource representing IRQ and its flags
99 * @ioport_shift: I/O port shift
100 * @__pio_mask: PIO mask
102 * Register a platform bus IDE interface. Such interfaces are PIO and we
103 * assume do not support IRQ sharing.
105 * Platform devices are expected to contain at least 2 resources per port:
107 * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
108 * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
112 * - IRQ (IORESOURCE_IRQ)
114 * If the base resources are both mem types, the ioremap() is handled
115 * here. For IORESOURCE_IO, it's assumed that there's no remapping
118 * If no IRQ resource is present, PIO polling mode is used instead.
120 int __devinit __pata_platform_probe(struct device *dev,
121 struct resource *io_res,
122 struct resource *ctl_res,
123 struct resource *irq_res,
124 unsigned int ioport_shift,
127 struct ata_host *host;
136 mmio = (( io_res->flags == IORESOURCE_MEM) &&
137 (ctl_res->flags == IORESOURCE_MEM));
142 if (irq_res && irq_res->start > 0) {
143 irq = irq_res->start;
144 irq_flags = irq_res->flags;
148 * Now that that's out of the way, wire up the port..
150 host = ata_host_alloc(dev, 1);
155 ap->ops = &pata_platform_port_ops;
156 ap->pio_mask = __pio_mask;
157 ap->flags |= ATA_FLAG_SLAVE_POSS;
160 * Use polling mode if there's no IRQ
163 ap->flags |= ATA_FLAG_PIO_POLLING;
164 ata_port_desc(ap, "no IRQ, using PIO polling");
168 * Handle the MMIO case
171 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
172 io_res->end - io_res->start + 1);
173 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
174 ctl_res->end - ctl_res->start + 1);
176 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
177 io_res->end - io_res->start + 1);
178 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
179 ctl_res->end - ctl_res->start + 1);
181 if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
182 dev_err(dev, "failed to map IO/CTL base\n");
186 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
188 pata_platform_setup_port(&ap->ioaddr, ioport_shift);
190 ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
191 (unsigned long long)io_res->start,
192 (unsigned long long)ctl_res->start);
195 return ata_host_activate(host, irq, irq ? ata_interrupt : NULL,
196 irq_flags, &pata_platform_sht);
198 EXPORT_SYMBOL_GPL(__pata_platform_probe);
201 * __pata_platform_remove - unplug a platform interface
204 * A platform bus ATA device has been unplugged. Perform the needed
205 * cleanup. Also called on module unload for any active devices.
207 int __devexit __pata_platform_remove(struct device *dev)
209 struct ata_host *host = dev_get_drvdata(dev);
211 ata_host_detach(host);
215 EXPORT_SYMBOL_GPL(__pata_platform_remove);
217 static int __devinit pata_platform_probe(struct platform_device *pdev)
219 struct resource *io_res;
220 struct resource *ctl_res;
221 struct resource *irq_res;
222 struct pata_platform_info *pp_info = pdev->dev.platform_data;
225 * Simple resource validation ..
227 if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
228 dev_err(&pdev->dev, "invalid number of resources\n");
233 * Get the I/O base first
235 io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
236 if (io_res == NULL) {
237 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
238 if (unlikely(io_res == NULL))
245 ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
246 if (ctl_res == NULL) {
247 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
248 if (unlikely(ctl_res == NULL))
255 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
257 irq_res->flags = pp_info ? pp_info->irq_flags : 0;
259 return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
260 pp_info ? pp_info->ioport_shift : 0,
264 static int __devexit pata_platform_remove(struct platform_device *pdev)
266 return __pata_platform_remove(&pdev->dev);
269 static struct platform_driver pata_platform_driver = {
270 .probe = pata_platform_probe,
271 .remove = __devexit_p(pata_platform_remove),
274 .owner = THIS_MODULE,
278 static int __init pata_platform_init(void)
280 return platform_driver_register(&pata_platform_driver);
283 static void __exit pata_platform_exit(void)
285 platform_driver_unregister(&pata_platform_driver);
287 module_init(pata_platform_init);
288 module_exit(pata_platform_exit);
290 module_param(pio_mask, int, 0);
292 MODULE_AUTHOR("Paul Mundt");
293 MODULE_DESCRIPTION("low-level driver for platform device ATA");
294 MODULE_LICENSE("GPL");
295 MODULE_VERSION(DRV_VERSION);