2 * ixp4xx PATA/Compact Flash driver
3 * Copyright (c) 2006 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. The interrupt line is optional, if not
10 * specified the driver will run in polling mode.
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/libata.h>
21 #include <linux/irq.h>
22 #include <linux/platform_device.h>
23 #include <scsi/scsi_host.h>
25 #define DRV_NAME "pata_ixp4xx_cf"
26 #define DRV_VERSION "0.1.1"
28 static void ixp4xx_set_mode(struct ata_port *ap)
32 for (i = 0; i < ATA_MAX_DEVICES; i++) {
33 struct ata_device *dev = &ap->device[i];
34 if (ata_dev_enabled(dev)) {
35 dev->pio_mode = XFER_PIO_0;
36 dev->xfer_mode = XFER_PIO_0;
37 dev->xfer_shift = ATA_SHIFT_PIO;
38 dev->flags |= ATA_DFLAG_PIO;
43 static void ixp4xx_phy_reset(struct ata_port *ap)
45 ap->cbl = ATA_CBL_PATA40;
50 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
51 unsigned int buflen, int write_data)
54 unsigned int words = buflen >> 1;
55 u16 *buf16 = (u16 *) buf;
56 struct ata_port *ap = adev->ap;
57 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
58 struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
60 /* set the expansion bus in 16bit mode and restore
61 * 8 bit mode after the transaction.
63 *data->cs0_cfg &= ~(0x01);
66 /* Transfer multiple of 2 bytes */
68 for (i = 0; i < words; i++)
69 writew(buf16[i], mmio);
71 for (i = 0; i < words; i++)
72 buf16[i] = readw(mmio);
75 /* Transfer trailing 1 byte, if any. */
76 if (unlikely(buflen & 0x01)) {
77 u16 align_buf[1] = { 0 };
78 unsigned char *trailing_buf = buf + buflen - 1;
81 memcpy(align_buf, trailing_buf, 1);
82 writew(align_buf[0], mmio);
84 align_buf[0] = readw(mmio);
85 memcpy(trailing_buf, align_buf, 1);
90 *data->cs0_cfg |= 0x01;
93 static void ixp4xx_irq_clear(struct ata_port *ap)
97 static void ixp4xx_host_stop (struct ata_host *host)
99 struct ixp4xx_pata_data *data = host->dev->platform_data;
105 static struct scsi_host_template ixp4xx_sht = {
106 .module = THIS_MODULE,
108 .ioctl = ata_scsi_ioctl,
109 .queuecommand = ata_scsi_queuecmd,
110 .can_queue = ATA_DEF_QUEUE,
111 .this_id = ATA_SHT_THIS_ID,
112 .sg_tablesize = LIBATA_MAX_PRD,
113 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
114 .emulated = ATA_SHT_EMULATED,
115 .use_clustering = ATA_SHT_USE_CLUSTERING,
116 .proc_name = DRV_NAME,
117 .dma_boundary = ATA_DMA_BOUNDARY,
118 .slave_configure = ata_scsi_slave_config,
119 .slave_destroy = ata_scsi_slave_destroy,
120 .bios_param = ata_std_bios_param,
123 static struct ata_port_operations ixp4xx_port_ops = {
124 .set_mode = ixp4xx_set_mode,
125 .mode_filter = ata_pci_default_filter,
127 .port_disable = ata_port_disable,
128 .tf_load = ata_tf_load,
129 .tf_read = ata_tf_read,
130 .check_status = ata_check_status,
131 .exec_command = ata_exec_command,
132 .dev_select = ata_std_dev_select,
134 .qc_prep = ata_qc_prep,
135 .qc_issue = ata_qc_issue_prot,
136 .eng_timeout = ata_eng_timeout,
137 .data_xfer = ixp4xx_mmio_data_xfer,
139 .irq_handler = ata_interrupt,
140 .irq_clear = ixp4xx_irq_clear,
142 .port_start = ata_port_start,
143 .port_stop = ata_port_stop,
144 .host_stop = ixp4xx_host_stop,
146 .phy_reset = ixp4xx_phy_reset,
149 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
150 struct ixp4xx_pata_data *data)
152 ioaddr->cmd_addr = (unsigned long) data->cs0;
153 ioaddr->altstatus_addr = (unsigned long) data->cs1 + 0x06;
154 ioaddr->ctl_addr = (unsigned long) data->cs1 + 0x06;
156 ata_std_ports(ioaddr);
160 /* adjust the addresses to handle the address swizzling of the
161 * ixp4xx in little endian mode.
164 ioaddr->data_addr ^= 0x02;
165 ioaddr->cmd_addr ^= 0x03;
166 ioaddr->altstatus_addr ^= 0x03;
167 ioaddr->ctl_addr ^= 0x03;
168 ioaddr->error_addr ^= 0x03;
169 ioaddr->feature_addr ^= 0x03;
170 ioaddr->nsect_addr ^= 0x03;
171 ioaddr->lbal_addr ^= 0x03;
172 ioaddr->lbam_addr ^= 0x03;
173 ioaddr->lbah_addr ^= 0x03;
174 ioaddr->device_addr ^= 0x03;
175 ioaddr->status_addr ^= 0x03;
176 ioaddr->command_addr ^= 0x03;
180 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
184 struct resource *cs0, *cs1;
185 struct ata_probe_ent ae;
187 struct ixp4xx_pata_data *data = pdev->dev.platform_data;
189 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
190 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
195 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
197 data->cs0 = ioremap(cs0->start, 0x1000);
198 data->cs1 = ioremap(cs1->start, 0x1000);
200 irq = platform_get_irq(pdev, 0);
202 set_irq_type(irq, IRQT_HIGH);
204 /* Setup expansion bus chip selects */
205 *data->cs0_cfg = data->cs0_bits;
206 *data->cs1_cfg = data->cs1_bits;
208 memset(&ae, 0, sizeof(struct ata_probe_ent));
209 INIT_LIST_HEAD(&ae.node);
212 ae.port_ops = &ixp4xx_port_ops;
213 ae.sht = &ixp4xx_sht;
215 ae.pio_mask = 0x1f; /* PIO4 */
218 ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
219 | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
221 /* run in polling mode if no irq has been assigned */
223 ae.port_flags |= ATA_FLAG_PIO_POLLING;
225 ixp4xx_setup_port(&ae.port[0], data);
227 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
229 ret = ata_device_add(&ae);
236 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
238 struct ata_host *host = platform_get_drvdata(dev);
240 ata_host_remove(host);
241 platform_set_drvdata(dev, NULL);
246 static struct platform_driver ixp4xx_pata_platform_driver = {
249 .owner = THIS_MODULE,
251 .probe = ixp4xx_pata_probe,
252 .remove = __devexit_p(ixp4xx_pata_remove),
255 static int __init ixp4xx_pata_init(void)
257 return platform_driver_register(&ixp4xx_pata_platform_driver);
260 static void __exit ixp4xx_pata_exit(void)
262 platform_driver_unregister(&ixp4xx_pata_platform_driver);
265 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
266 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
267 MODULE_LICENSE("GPL");
268 MODULE_VERSION(DRV_VERSION);
270 module_init(ixp4xx_pata_init);
271 module_exit(ixp4xx_pata_exit);