[libata] pata_ixp4xx: kill unused var
[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_port *ap, struct ata_device **error)
30 {
31         int i;
32
33         for (i = 0; i < ATA_MAX_DEVICES; i++) {
34                 struct ata_device *dev = &ap->device[i];
35                 if (ata_dev_enabled(dev)) {
36                         ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n");
37                         dev->pio_mode = XFER_PIO_0;
38                         dev->xfer_mode = XFER_PIO_0;
39                         dev->xfer_shift = ATA_SHIFT_PIO;
40                         dev->flags |= ATA_DFLAG_PIO;
41                 }
42         }
43         return 0;
44 }
45
46 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
47                                 unsigned int buflen, int write_data)
48 {
49         unsigned int i;
50         unsigned int words = buflen >> 1;
51         u16 *buf16 = (u16 *) buf;
52         struct ata_port *ap = adev->ap;
53         void __iomem *mmio = ap->ioaddr.data_addr;
54         struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
55
56         /* set the expansion bus in 16bit mode and restore
57          * 8 bit mode after the transaction.
58          */
59         *data->cs0_cfg &= ~(0x01);
60         udelay(100);
61
62         /* Transfer multiple of 2 bytes */
63         if (write_data) {
64                 for (i = 0; i < words; i++)
65                         writew(buf16[i], mmio);
66         } else {
67                 for (i = 0; i < words; i++)
68                         buf16[i] = readw(mmio);
69         }
70
71         /* Transfer trailing 1 byte, if any. */
72         if (unlikely(buflen & 0x01)) {
73                 u16 align_buf[1] = { 0 };
74                 unsigned char *trailing_buf = buf + buflen - 1;
75
76                 if (write_data) {
77                         memcpy(align_buf, trailing_buf, 1);
78                         writew(align_buf[0], mmio);
79                 } else {
80                         align_buf[0] = readw(mmio);
81                         memcpy(trailing_buf, align_buf, 1);
82                 }
83         }
84
85         udelay(100);
86         *data->cs0_cfg |= 0x01;
87 }
88
89 static struct scsi_host_template ixp4xx_sht = {
90         .module                 = THIS_MODULE,
91         .name                   = DRV_NAME,
92         .ioctl                  = ata_scsi_ioctl,
93         .queuecommand           = ata_scsi_queuecmd,
94         .can_queue              = ATA_DEF_QUEUE,
95         .this_id                = ATA_SHT_THIS_ID,
96         .sg_tablesize           = LIBATA_MAX_PRD,
97         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
98         .emulated               = ATA_SHT_EMULATED,
99         .use_clustering         = ATA_SHT_USE_CLUSTERING,
100         .proc_name              = DRV_NAME,
101         .dma_boundary           = ATA_DMA_BOUNDARY,
102         .slave_configure        = ata_scsi_slave_config,
103         .slave_destroy          = ata_scsi_slave_destroy,
104         .bios_param             = ata_std_bios_param,
105 };
106
107 static struct ata_port_operations ixp4xx_port_ops = {
108         .set_mode               = ixp4xx_set_mode,
109         .mode_filter            = ata_pci_default_filter,
110
111         .port_disable           = ata_port_disable,
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         .irq_ack                = ata_dummy_irq_ack,
132
133         .port_start             = ata_port_start,
134 };
135
136 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
137                                 struct ixp4xx_pata_data *data)
138 {
139         ioaddr->cmd_addr        = data->cs0;
140         ioaddr->altstatus_addr  = data->cs1 + 0x06;
141         ioaddr->ctl_addr        = data->cs1 + 0x06;
142
143         ata_std_ports(ioaddr);
144
145 #ifndef __ARMEB__
146
147         /* adjust the addresses to handle the address swizzling of the
148          * ixp4xx in little endian mode.
149          */
150
151         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
152         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
153         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
154         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
155         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
156         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
157         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
158         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
159         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
160         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
161         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
162         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
163         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
164 #endif
165 }
166
167 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
168 {
169         unsigned int irq;
170         struct resource *cs0, *cs1;
171         struct ata_host *host;
172         struct ata_port *ap;
173         struct ixp4xx_pata_data *data = pdev->dev.platform_data;
174
175         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
176         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
177
178         if (!cs0 || !cs1)
179                 return -EINVAL;
180
181         /* allocate host */
182         host = ata_host_alloc(&pdev->dev, 1);
183         if (!host)
184                 return -ENOMEM;
185
186         /* acquire resources and fill host */
187         pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
188
189         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
190         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
191
192         irq = platform_get_irq(pdev, 0);
193         if (irq)
194                 set_irq_type(irq, IRQT_RISING);
195
196         /* Setup expansion bus chip selects */
197         *data->cs0_cfg = data->cs0_bits;
198         *data->cs1_cfg = data->cs1_bits;
199
200         ap = host->ports[0];
201
202         ap->ops = &ixp4xx_port_ops;
203         ap->pio_mask = 0x1f; /* PIO4 */
204         ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
205
206         ixp4xx_setup_port(&ap->ioaddr, data);
207
208         dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
209
210         /* activate host */
211         return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
212 }
213
214 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
215 {
216         struct ata_host *host = platform_get_drvdata(dev);
217
218         ata_host_detach(host);
219
220         return 0;
221 }
222
223 static struct platform_driver ixp4xx_pata_platform_driver = {
224         .driver  = {
225                 .name   = DRV_NAME,
226                 .owner  = THIS_MODULE,
227         },
228         .probe          = ixp4xx_pata_probe,
229         .remove         = __devexit_p(ixp4xx_pata_remove),
230 };
231
232 static int __init ixp4xx_pata_init(void)
233 {
234         return platform_driver_register(&ixp4xx_pata_platform_driver);
235 }
236
237 static void __exit ixp4xx_pata_exit(void)
238 {
239         platform_driver_unregister(&ixp4xx_pata_platform_driver);
240 }
241
242 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
243 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
244 MODULE_LICENSE("GPL");
245 MODULE_VERSION(DRV_VERSION);
246
247 module_init(ixp4xx_pata_init);
248 module_exit(ixp4xx_pata_exit);