xref: /openbmc/linux/drivers/ata/pata_platform.c (revision 4800cd83)
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/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>
23 
24 #define DRV_NAME "pata_platform"
25 #define DRV_VERSION "1.2"
26 
27 static int pio_mask = 1;
28 
29 /*
30  * Provide our own set_mode() as we don't want to change anything that has
31  * already been configured..
32  */
33 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
34 {
35 	struct ata_device *dev;
36 
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_printk(dev, KERN_INFO, "configured for PIO\n");
43 	}
44 	return 0;
45 }
46 
47 static struct scsi_host_template pata_platform_sht = {
48 	ATA_PIO_SHT(DRV_NAME),
49 };
50 
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,
56 };
57 
58 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
59 				     unsigned int shift)
60 {
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);
72 }
73 
74 /**
75  *	__pata_platform_probe		-	attach a platform interface
76  *	@dev: device
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
82  *
83  *	Register a platform bus IDE interface. Such interfaces are PIO and we
84  *	assume do not support IRQ sharing.
85  *
86  *	Platform devices are expected to contain at least 2 resources per port:
87  *
88  *		- I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
89  *		- CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
90  *
91  *	and optionally:
92  *
93  *		- IRQ	   (IORESOURCE_IRQ)
94  *
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
97  *	necessary.
98  *
99  *	If no IRQ resource is present, PIO polling mode is used instead.
100  */
101 int __devinit __pata_platform_probe(struct device *dev,
102 				    struct resource *io_res,
103 				    struct resource *ctl_res,
104 				    struct resource *irq_res,
105 				    unsigned int ioport_shift,
106 				    int __pio_mask)
107 {
108 	struct ata_host *host;
109 	struct ata_port *ap;
110 	unsigned int mmio;
111 	int irq = 0;
112 	int irq_flags = 0;
113 
114 	/*
115 	 * Check for MMIO
116 	 */
117 	mmio = (( io_res->flags == IORESOURCE_MEM) &&
118 		(ctl_res->flags == IORESOURCE_MEM));
119 
120 	/*
121 	 * And the IRQ
122 	 */
123 	if (irq_res && irq_res->start > 0) {
124 		irq = irq_res->start;
125 		irq_flags = irq_res->flags;
126 	}
127 
128 	/*
129 	 * Now that that's out of the way, wire up the port..
130 	 */
131 	host = ata_host_alloc(dev, 1);
132 	if (!host)
133 		return -ENOMEM;
134 	ap = host->ports[0];
135 
136 	ap->ops = &pata_platform_port_ops;
137 	ap->pio_mask = __pio_mask;
138 	ap->flags |= ATA_FLAG_SLAVE_POSS;
139 
140 	/*
141 	 * Use polling mode if there's no IRQ
142 	 */
143 	if (!irq) {
144 		ap->flags |= ATA_FLAG_PIO_POLLING;
145 		ata_port_desc(ap, "no IRQ, using PIO polling");
146 	}
147 
148 	/*
149 	 * Handle the MMIO case
150 	 */
151 	if (mmio) {
152 		ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
153 				resource_size(io_res));
154 		ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
155 				resource_size(ctl_res));
156 	} else {
157 		ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
158 				resource_size(io_res));
159 		ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
160 				resource_size(ctl_res));
161 	}
162 	if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
163 		dev_err(dev, "failed to map IO/CTL base\n");
164 		return -ENOMEM;
165 	}
166 
167 	ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
168 
169 	pata_platform_setup_port(&ap->ioaddr, ioport_shift);
170 
171 	ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
172 		      (unsigned long long)io_res->start,
173 		      (unsigned long long)ctl_res->start);
174 
175 	/* activate */
176 	return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
177 				 irq_flags, &pata_platform_sht);
178 }
179 EXPORT_SYMBOL_GPL(__pata_platform_probe);
180 
181 /**
182  *	__pata_platform_remove		-	unplug a platform interface
183  *	@dev: device
184  *
185  *	A platform bus ATA device has been unplugged. Perform the needed
186  *	cleanup. Also called on module unload for any active devices.
187  */
188 int __pata_platform_remove(struct device *dev)
189 {
190 	struct ata_host *host = dev_get_drvdata(dev);
191 
192 	ata_host_detach(host);
193 
194 	return 0;
195 }
196 EXPORT_SYMBOL_GPL(__pata_platform_remove);
197 
198 static int __devinit pata_platform_probe(struct platform_device *pdev)
199 {
200 	struct resource *io_res;
201 	struct resource *ctl_res;
202 	struct resource *irq_res;
203 	struct pata_platform_info *pp_info = pdev->dev.platform_data;
204 
205 	/*
206 	 * Simple resource validation ..
207 	 */
208 	if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
209 		dev_err(&pdev->dev, "invalid number of resources\n");
210 		return -EINVAL;
211 	}
212 
213 	/*
214 	 * Get the I/O base first
215 	 */
216 	io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
217 	if (io_res == NULL) {
218 		io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
219 		if (unlikely(io_res == NULL))
220 			return -EINVAL;
221 	}
222 
223 	/*
224 	 * Then the CTL base
225 	 */
226 	ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
227 	if (ctl_res == NULL) {
228 		ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
229 		if (unlikely(ctl_res == NULL))
230 			return -EINVAL;
231 	}
232 
233 	/*
234 	 * And the IRQ
235 	 */
236 	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
237 	if (irq_res)
238 		irq_res->flags = pp_info ? pp_info->irq_flags : 0;
239 
240 	return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
241 				     pp_info ? pp_info->ioport_shift : 0,
242 				     pio_mask);
243 }
244 
245 static int __devexit pata_platform_remove(struct platform_device *pdev)
246 {
247 	return __pata_platform_remove(&pdev->dev);
248 }
249 
250 static struct platform_driver pata_platform_driver = {
251 	.probe		= pata_platform_probe,
252 	.remove		= __devexit_p(pata_platform_remove),
253 	.driver = {
254 		.name		= DRV_NAME,
255 		.owner		= THIS_MODULE,
256 	},
257 };
258 
259 static int __init pata_platform_init(void)
260 {
261 	return platform_driver_register(&pata_platform_driver);
262 }
263 
264 static void __exit pata_platform_exit(void)
265 {
266 	platform_driver_unregister(&pata_platform_driver);
267 }
268 module_init(pata_platform_init);
269 module_exit(pata_platform_exit);
270 
271 module_param(pio_mask, int, 0);
272 
273 MODULE_AUTHOR("Paul Mundt");
274 MODULE_DESCRIPTION("low-level driver for platform device ATA");
275 MODULE_LICENSE("GPL");
276 MODULE_VERSION(DRV_VERSION);
277 MODULE_ALIAS("platform:" DRV_NAME);
278