shmem: new export ops
[linux-2.6/linux-trees-mm.git] / drivers / ata / pata_ixp4xx_cf.c
blobfcd532afbf2e011c9b4d5183430945d409c702eb
1 /*
2 * ixp4xx PATA/Compact Flash driver
3 * Copyright (C) 2006-07 Tower Technologies
4 * Author: Alessandro Zummo <a.zummo@towertech.it>
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.
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.
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>
26 #define DRV_NAME "pata_ixp4xx_cf"
27 #define DRV_VERSION "0.2"
29 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
31 struct ata_device *dev;
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;
42 return 0;
45 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
46 unsigned int buflen, int write_data)
48 unsigned int i;
49 unsigned int words = buflen >> 1;
50 u16 *buf16 = (u16 *) buf;
51 struct ata_port *ap = adev->link->ap;
52 void __iomem *mmio = ap->ioaddr.data_addr;
53 struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
55 /* set the expansion bus in 16bit mode and restore
56 * 8 bit mode after the transaction.
58 *data->cs0_cfg &= ~(0x01);
59 udelay(100);
61 /* Transfer multiple of 2 bytes */
62 if (write_data) {
63 for (i = 0; i < words; i++)
64 writew(buf16[i], mmio);
65 } else {
66 for (i = 0; i < words; i++)
67 buf16[i] = readw(mmio);
70 /* Transfer trailing 1 byte, if any. */
71 if (unlikely(buflen & 0x01)) {
72 u16 align_buf[1] = { 0 };
73 unsigned char *trailing_buf = buf + buflen - 1;
75 if (write_data) {
76 memcpy(align_buf, trailing_buf, 1);
77 writew(align_buf[0], mmio);
78 } else {
79 align_buf[0] = readw(mmio);
80 memcpy(trailing_buf, align_buf, 1);
84 udelay(100);
85 *data->cs0_cfg |= 0x01;
88 static struct scsi_host_template ixp4xx_sht = {
89 .module = THIS_MODULE,
90 .name = DRV_NAME,
91 .ioctl = ata_scsi_ioctl,
92 .queuecommand = ata_scsi_queuecmd,
93 .can_queue = ATA_DEF_QUEUE,
94 .this_id = ATA_SHT_THIS_ID,
95 .sg_tablesize = LIBATA_MAX_PRD,
96 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
97 .emulated = ATA_SHT_EMULATED,
98 .use_clustering = ATA_SHT_USE_CLUSTERING,
99 .proc_name = DRV_NAME,
100 .dma_boundary = ATA_DMA_BOUNDARY,
101 .slave_configure = ata_scsi_slave_config,
102 .slave_destroy = ata_scsi_slave_destroy,
103 .bios_param = ata_std_bios_param,
106 static struct ata_port_operations ixp4xx_port_ops = {
107 .set_mode = ixp4xx_set_mode,
108 .mode_filter = ata_pci_default_filter,
110 .tf_load = ata_tf_load,
111 .tf_read = ata_tf_read,
112 .exec_command = ata_exec_command,
113 .check_status = ata_check_status,
114 .dev_select = ata_std_dev_select,
116 .freeze = ata_bmdma_freeze,
117 .thaw = ata_bmdma_thaw,
118 .error_handler = ata_bmdma_error_handler,
119 .post_internal_cmd = ata_bmdma_post_internal_cmd,
121 .qc_prep = ata_qc_prep,
122 .qc_issue = ata_qc_issue_prot,
123 .data_xfer = ixp4xx_mmio_data_xfer,
124 .cable_detect = ata_cable_40wire,
126 .irq_handler = ata_interrupt,
127 .irq_clear = ata_bmdma_irq_clear,
128 .irq_on = ata_irq_on,
130 .port_start = ata_port_start,
133 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
134 struct ixp4xx_pata_data *data,
135 unsigned long raw_cs0, unsigned long raw_cs1)
137 unsigned long raw_cmd = raw_cs0;
138 unsigned long raw_ctl = raw_cs1 + 0x06;
140 ioaddr->cmd_addr = data->cs0;
141 ioaddr->altstatus_addr = data->cs1 + 0x06;
142 ioaddr->ctl_addr = data->cs1 + 0x06;
144 ata_std_ports(ioaddr);
146 #ifndef __ARMEB__
148 /* adjust the addresses to handle the address swizzling of the
149 * ixp4xx in little endian mode.
152 *(unsigned long *)&ioaddr->data_addr ^= 0x02;
153 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
154 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
155 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
156 *(unsigned long *)&ioaddr->error_addr ^= 0x03;
157 *(unsigned long *)&ioaddr->feature_addr ^= 0x03;
158 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
159 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
160 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
161 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
162 *(unsigned long *)&ioaddr->device_addr ^= 0x03;
163 *(unsigned long *)&ioaddr->status_addr ^= 0x03;
164 *(unsigned long *)&ioaddr->command_addr ^= 0x03;
166 raw_cmd ^= 0x03;
167 raw_ctl ^= 0x03;
168 #endif
170 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
173 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
175 unsigned int irq;
176 struct resource *cs0, *cs1;
177 struct ata_host *host;
178 struct ata_port *ap;
179 struct ixp4xx_pata_data *data = pdev->dev.platform_data;
181 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
182 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
184 if (!cs0 || !cs1)
185 return -EINVAL;
187 /* allocate host */
188 host = ata_host_alloc(&pdev->dev, 1);
189 if (!host)
190 return -ENOMEM;
192 /* acquire resources and fill host */
193 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
195 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
196 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
198 if (!data->cs0 || !data->cs1)
199 return -ENOMEM;
201 irq = platform_get_irq(pdev, 0);
202 if (irq)
203 set_irq_type(irq, IRQT_RISING);
205 /* Setup expansion bus chip selects */
206 *data->cs0_cfg = data->cs0_bits;
207 *data->cs1_cfg = data->cs1_bits;
209 ap = host->ports[0];
211 ap->ops = &ixp4xx_port_ops;
212 ap->pio_mask = 0x1f; /* PIO4 */
213 ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI;
215 ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
217 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
219 /* activate host */
220 return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht);
223 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
225 struct ata_host *host = platform_get_drvdata(dev);
227 ata_host_detach(host);
229 return 0;
232 static struct platform_driver ixp4xx_pata_platform_driver = {
233 .driver = {
234 .name = DRV_NAME,
235 .owner = THIS_MODULE,
237 .probe = ixp4xx_pata_probe,
238 .remove = __devexit_p(ixp4xx_pata_remove),
241 static int __init ixp4xx_pata_init(void)
243 return platform_driver_register(&ixp4xx_pata_platform_driver);
246 static void __exit ixp4xx_pata_exit(void)
248 platform_driver_unregister(&ixp4xx_pata_platform_driver);
251 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
252 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
253 MODULE_LICENSE("GPL");
254 MODULE_VERSION(DRV_VERSION);
256 module_init(ixp4xx_pata_init);
257 module_exit(ixp4xx_pata_exit);