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 "0.1.2"
28 static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device **error)
32 for (i = 0; i < ATA_MAX_DEVICES; i++) {
33 struct ata_device *dev = &ap->device[i];
34 if (ata_dev_ready(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;
45 static void ixp4xx_phy_reset(struct ata_port *ap)
47 ap->cbl = ATA_CBL_PATA40;
52 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
53 unsigned int buflen, int write_data)
56 unsigned int words = buflen >> 1;
57 u16 *buf16 = (u16 *) buf;
58 struct ata_port *ap = adev->ap;
59 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
60 struct ixp4xx_pata_data *data = ap->host->dev->platform_data;
62 /* set the expansion bus in 16bit mode and restore
63 * 8 bit mode after the transaction.
65 *data->cs0_cfg &= ~(0x01);
68 /* Transfer multiple of 2 bytes */
70 for (i = 0; i < words; i++)
71 writew(buf16[i], mmio);
73 for (i = 0; i < words; i++)
74 buf16[i] = readw(mmio);
77 /* Transfer trailing 1 byte, if any. */
78 if (unlikely(buflen & 0x01)) {
79 u16 align_buf[1] = { 0 };
80 unsigned char *trailing_buf = buf + buflen - 1;
83 memcpy(align_buf, trailing_buf, 1);
84 writew(align_buf[0], mmio);
86 align_buf[0] = readw(mmio);
87 memcpy(trailing_buf, align_buf, 1);
92 *data->cs0_cfg |= 0x01;
95 static void ixp4xx_irq_clear(struct ata_port *ap)
99 static struct scsi_host_template ixp4xx_sht = {
100 .module = THIS_MODULE,
102 .ioctl = ata_scsi_ioctl,
103 .queuecommand = ata_scsi_queuecmd,
104 .can_queue = ATA_DEF_QUEUE,
105 .this_id = ATA_SHT_THIS_ID,
106 .sg_tablesize = LIBATA_MAX_PRD,
107 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
108 .emulated = ATA_SHT_EMULATED,
109 .use_clustering = ATA_SHT_USE_CLUSTERING,
110 .proc_name = DRV_NAME,
111 .dma_boundary = ATA_DMA_BOUNDARY,
112 .slave_configure = ata_scsi_slave_config,
113 .slave_destroy = ata_scsi_slave_destroy,
114 .bios_param = ata_std_bios_param,
117 static struct ata_port_operations ixp4xx_port_ops = {
118 .set_mode = ixp4xx_set_mode,
119 .mode_filter = ata_pci_default_filter,
121 .port_disable = ata_port_disable,
122 .tf_load = ata_tf_load,
123 .tf_read = ata_tf_read,
124 .check_status = ata_check_status,
125 .exec_command = ata_exec_command,
126 .dev_select = ata_std_dev_select,
128 .qc_prep = ata_qc_prep,
129 .qc_issue = ata_qc_issue_prot,
130 .eng_timeout = ata_eng_timeout,
131 .data_xfer = ixp4xx_mmio_data_xfer,
132 .cable_detect = ata_cable_40wire,
134 .irq_handler = ata_interrupt,
135 .irq_clear = ixp4xx_irq_clear,
136 .irq_on = ata_irq_on,
137 .irq_ack = ata_irq_ack,
139 .port_start = ata_port_start,
141 .phy_reset = ixp4xx_phy_reset,
144 static void ixp4xx_setup_port(struct ata_ioports *ioaddr,
145 struct ixp4xx_pata_data *data)
147 ioaddr->cmd_addr = data->cs0;
148 ioaddr->altstatus_addr = data->cs1 + 0x06;
149 ioaddr->ctl_addr = data->cs1 + 0x06;
151 ata_std_ports(ioaddr);
155 /* adjust the addresses to handle the address swizzling of the
156 * ixp4xx in little endian mode.
159 *(unsigned long *)&ioaddr->data_addr ^= 0x02;
160 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
161 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
162 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
163 *(unsigned long *)&ioaddr->error_addr ^= 0x03;
164 *(unsigned long *)&ioaddr->feature_addr ^= 0x03;
165 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
166 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
167 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
168 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
169 *(unsigned long *)&ioaddr->device_addr ^= 0x03;
170 *(unsigned long *)&ioaddr->status_addr ^= 0x03;
171 *(unsigned long *)&ioaddr->command_addr ^= 0x03;
175 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
179 struct resource *cs0, *cs1;
180 struct ata_probe_ent ae;
182 struct ixp4xx_pata_data *data = pdev->dev.platform_data;
184 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
185 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
190 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
192 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
193 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
195 irq = platform_get_irq(pdev, 0);
197 set_irq_type(irq, IRQT_RISING);
199 /* Setup expansion bus chip selects */
200 *data->cs0_cfg = data->cs0_bits;
201 *data->cs1_cfg = data->cs1_bits;
203 memset(&ae, 0, sizeof(struct ata_probe_ent));
204 INIT_LIST_HEAD(&ae.node);
207 ae.port_ops = &ixp4xx_port_ops;
208 ae.sht = &ixp4xx_sht;
210 ae.pio_mask = 0x1f; /* PIO4 */
213 ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY
214 | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST;
216 /* run in polling mode if no irq has been assigned */
218 ae.port_flags |= ATA_FLAG_PIO_POLLING;
220 ixp4xx_setup_port(&ae.port[0], data);
222 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
224 ret = ata_device_add(&ae);
231 static __devexit int ixp4xx_pata_remove(struct platform_device *dev)
233 struct ata_host *host = platform_get_drvdata(dev);
235 ata_host_detach(host);
240 static struct platform_driver ixp4xx_pata_platform_driver = {
243 .owner = THIS_MODULE,
245 .probe = ixp4xx_pata_probe,
246 .remove = __devexit_p(ixp4xx_pata_remove),
249 static int __init ixp4xx_pata_init(void)
251 return platform_driver_register(&ixp4xx_pata_platform_driver);
254 static void __exit ixp4xx_pata_exit(void)
256 platform_driver_unregister(&ixp4xx_pata_platform_driver);
259 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
260 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
261 MODULE_LICENSE("GPL");
262 MODULE_VERSION(DRV_VERSION);
264 module_init(ixp4xx_pata_init);
265 module_exit(ixp4xx_pata_exit);