libata: update ->data_xfer hook for ATAPI
[linux-2.6.git] / drivers / ata / pata_ixp4xx_cf.c
1 /*
2  * ixp4xx PATA/Compact Flash driver
3  * Copyright (C) 2006-07 Tower Technologies
4  * Author: Alessandro Zummo <a.zummo@towertech.it>
5  *
6  * An ATA driver to handle a Compact Flash connected
7  * to the ixp4xx expansion bus in TrueIDE mode. The CF
8  * must have it chip selects connected to two CS lines
9  * on the ixp4xx. In the irq is not available, you might
10  * want to modify both this driver and libata to run in
11  * polling mode.
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License version 2 as
15  * published by the Free Software Foundation.
16  *
17  */
18
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/libata.h>
22 #include <linux/irq.h>
23 #include <linux/platform_device.h>
24 #include <scsi/scsi_host.h>
25
26 #define DRV_NAME        "pata_ixp4xx_cf"
27 #define DRV_VERSION     "0.2"
28
29 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
30 {
31         struct ata_device *dev;
32
33         ata_link_for_each_dev(dev, link) {
34                 if (ata_dev_enabled(dev)) {
35                         ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
36                         dev->pio_mode = XFER_PIO_0;
37                         dev->xfer_mode = XFER_PIO_0;
38                         dev->xfer_shift = ATA_SHIFT_PIO;
39                         dev->flags |= ATA_DFLAG_PIO;
40                 }
41         }
42         return 0;
43 }
44
45 static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
46                                 unsigned char *buf, unsigned int buflen, int rw)
47 {
48         unsigned int i;
49         unsigned int words = buflen >> 1;
50         u16 *buf16 = (u16 *) buf;
51         struct ata_port *ap = dev->link->ap;
52         void __iomem *mmio = ap->ioaddr.data_addr;
53         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
54
55         /* set the expansion bus in 16bit mode and restore
56          * 8 bit mode after the transaction.
57          */
58         *data->cs0_cfg &= ~(0x01);
59         udelay(100);
60
61         /* Transfer multiple of 2 bytes */
62         if (rw == READ)
63                 for (i = 0; i < words; i++)
64                         buf16[i] = readw(mmio);
65         else
66                 for (i = 0; i < words; i++)
67                         writew(buf16[i], mmio);
68
69         /* Transfer trailing 1 byte, if any. */
70         if (unlikely(buflen & 0x01)) {
71                 u16 align_buf[1] = { 0 };
72                 unsigned char *trailing_buf = buf + buflen - 1;
73
74                 if (rw == READ) {
75                         align_buf[0] = readw(mmio);
76                         memcpy(trailing_buf, align_buf, 1);
77                 } else {
78                         memcpy(align_buf, trailing_buf, 1);
79                         writew(align_buf[0], mmio);
80                 }
81                 words++;
82         }
83
84         udelay(100);
85         *data->cs0_cfg |= 0x01;
86
87         return words << 1;
88 }
89
90 static struct scsi_host_template ixp4xx_sht = {
91         .module                 = THIS_MODULE,
92         .name                   = DRV_NAME,
93         .ioctl                  = ata_scsi_ioctl,
94         .queuecommand           = ata_scsi_queuecmd,
95         .can_queue              = ATA_DEF_QUEUE,
96         .this_id                = ATA_SHT_THIS_ID,
97         .sg_tablesize           = LIBATA_MAX_PRD,
98         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
99         .emulated               = ATA_SHT_EMULATED,
100         .use_clustering         = ATA_SHT_USE_CLUSTERING,
101         .proc_name              = DRV_NAME,
102         .dma_boundary           = ATA_DMA_BOUNDARY,
103         .slave_configure        = ata_scsi_slave_config,
104         .slave_destroy          = ata_scsi_slave_destroy,
105         .bios_param             = ata_std_bios_param,
106 };
107
108 static struct ata_port_operations ixp4xx_port_ops = {
109         .set_mode               = ixp4xx_set_mode,
110         .mode_filter            = ata_pci_default_filter,
111
112         .tf_load                = ata_tf_load,
113         .tf_read                = ata_tf_read,
114         .exec_command           = ata_exec_command,
115         .check_status           = ata_check_status,
116         .dev_select             = ata_std_dev_select,
117
118         .freeze                 = ata_bmdma_freeze,
119         .thaw                   = ata_bmdma_thaw,
120         .error_handler          = ata_bmdma_error_handler,
121         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
122
123         .qc_prep                = ata_qc_prep,
124         .qc_issue               = ata_qc_issue_prot,
125         .data_xfer              = ixp4xx_mmio_data_xfer,
126         .cable_detect           = ata_cable_40wire,
127
128         .irq_handler            = ata_interrupt,
129         .irq_clear              = ata_bmdma_irq_clear,
130         .irq_on                 = ata_irq_on,
131
132         .port_start             = ata_port_start,
133 };
134
135 static void ixp4xx_setup_port(struct ata_port *ap,
136                               struct ixp4xx_pata_data *data,
137                               unsigned long raw_cs0, unsigned long raw_cs1)
138 {
139         struct ata_ioports *ioaddr = &ap->ioaddr;
140         unsigned long raw_cmd = raw_cs0;
141         unsigned long raw_ctl = raw_cs1 + 0x06;
142
143         ioaddr->cmd_addr        = data->cs0;
144         ioaddr->altstatus_addr  = data->cs1 + 0x06;
145         ioaddr->ctl_addr        = data->cs1 + 0x06;
146
147         ata_std_ports(ioaddr);
148
149 #ifndef __ARMEB__
150
151         /* adjust the addresses to handle the address swizzling of the
152          * ixp4xx in little endian mode.
153          */
154
155         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
156         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
157         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
158         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
159         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
160         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
161         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
162         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
163         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
164         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
165         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
166         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
167         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
168
169         raw_cmd ^= 0x03;
170         raw_ctl ^= 0x03;
171 #endif
172
173         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
174 }
175
176 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
177 {
178         unsigned int irq;
179         struct resource *cs0, *cs1;
180         struct ata_host *host;
181         struct ata_port *ap;
182         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
183
184         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
185         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
186
187         if (!cs0 || !cs1)
188                 return -EINVAL;
189
190         /* allocate host */
191         host = ata_host_alloc(&pdev->dev, 1);
192         if (!host)
193                 return -ENOMEM;
194
195         /* acquire resources and fill host */
196         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
197
198         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
199         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
200
201         if (!data->cs0 || !data->cs1)
202                 return -ENOMEM;
203
204         irq = platform_get_irq(pdev, 0);
205         if (irq)
206                 set_irq_type(irq, IRQT_RISING);
207
208         /* Setup expansion bus chip selects */
209         *data->cs0_cfg = data->cs0_bits;
210         *data->cs1_cfg = data->cs1_bits;
211
212         ap = host->ports[0];
213
214         ap->ops = &ixp4xx_port_ops;
215         ap->pio_mask = 0x1f; /* PIO4 */
216         ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
217
218         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
219
220         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
221
222         /* activate host */
223         return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
224 }
225
226 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
227 {
228         struct ata_host *host = platform_get_drvdata(dev);
229
230         ata_host_detach(host);
231
232         return 0;
233 }
234
235 static struct platform_driver ixp4xx_pata_platform_driver = {
236         .driver  = {
237                 .name   = DRV_NAME,
238                 .owner  = THIS_MODULE,
239         },
240         .probe          = ixp4xx_pata_probe,
241         .remove         = __devexit_p(ixp4xx_pata_remove),
242 };
243
244 static int __init ixp4xx_pata_init(void)
245 {
246         return platform_driver_register(&ixp4xx_pata_platform_driver);
247 }
248
249 static void __exit ixp4xx_pata_exit(void)
250 {
251         platform_driver_unregister(&ixp4xx_pata_platform_driver);
252 }
253
254 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
255 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
256 MODULE_LICENSE("GPL");
257 MODULE_VERSION(DRV_VERSION);
258
259 module_init(ixp4xx_pata_init);
260 module_exit(ixp4xx_pata_exit);