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 */
pata_platform_set_mode(struct ata_link * link,struct ata_device ** unused)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_info(dev, "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
pata_platform_setup_port(struct ata_ioports * ioaddr,unsigned int shift)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 */
__pata_platform_probe(struct device * dev,struct resource * io_res,struct resource * ctl_res,struct resource * irq_res,unsigned int ioport_shift,int __pio_mask)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 */
__pata_platform_remove(struct device * dev)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
pata_platform_probe(struct platform_device * pdev)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
pata_platform_remove(struct platform_device * pdev)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 module_platform_driver(pata_platform_driver);
260
261 module_param(pio_mask, int, 0);
262
263 MODULE_AUTHOR("Paul Mundt");
264 MODULE_DESCRIPTION("low-level driver for platform device ATA");
265 MODULE_LICENSE("GPL");
266 MODULE_VERSION(DRV_VERSION);
267 MODULE_ALIAS("platform:" DRV_NAME);
268