1 // SPDX-License-Identifier: GPL-2.0-only
3 * ixp4xx PATA/Compact Flash driver
4 * Copyright (C) 2006-07 Tower Technologies
5 * Author: Alessandro Zummo <a.zummo@towertech.it>
7 * An ATA driver to handle a Compact Flash connected
8 * to the ixp4xx expansion bus in TrueIDE mode. The CF
9 * must have it chip selects connected to two CS lines
10 * on the ixp4xx. In the irq is not available, you might
11 * want to modify both this driver and libata to run in
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/libata.h>
18 #include <linux/irq.h>
19 #include <linux/platform_device.h>
20 #include <linux/platform_data/pata_ixp4xx_cf.h>
21 #include <scsi/scsi_host.h>
23 #define DRV_NAME "pata_ixp4xx_cf"
24 #define DRV_VERSION "0.2"
26 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
28 struct ata_device *dev;
30 ata_for_each_dev(dev, link, ENABLED) {
31 ata_dev_info(dev, "configured for PIO0\n");
32 dev->pio_mode = XFER_PIO_0;
33 dev->xfer_mode = XFER_PIO_0;
34 dev->xfer_shift = ATA_SHIFT_PIO;
35 dev->flags |= ATA_DFLAG_PIO;
40 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
41 unsigned char *buf, unsigned int buflen, int rw)
44 unsigned int words = buflen >> 1;
45 u16 *buf16 = (u16 *) buf;
46 struct ata_port *ap = qc->dev->link->ap;
47 void __iomem *mmio = ap->ioaddr.data_addr;
48 struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
50 /* set the expansion bus in 16bit mode and restore
51 * 8 bit mode after the transaction.
53 *data->cs0_cfg &= ~(0x01);
56 /* Transfer multiple of 2 bytes */
58 for (i = 0; i < words; i++)
59 buf16[i] = readw(mmio);
61 for (i = 0; i < words; i++)
62 writew(buf16[i], mmio);
64 /* Transfer trailing 1 byte, if any. */
65 if (unlikely(buflen & 0x01)) {
66 u16 align_buf[1] = { 0 };
67 unsigned char *trailing_buf = buf + buflen - 1;
70 align_buf[0] = readw(mmio);
71 memcpy(trailing_buf, align_buf, 1);
73 memcpy(align_buf, trailing_buf, 1);
74 writew(align_buf[0], mmio);
80 *data->cs0_cfg |= 0x01;
85 static struct scsi_host_template ixp4xx_sht = {
86 ATA_PIO_SHT(DRV_NAME),
89 static struct ata_port_operations ixp4xx_port_ops = {
90 .inherits = &ata_sff_port_ops,
91 .sff_data_xfer = ixp4xx_mmio_data_xfer,
92 .cable_detect = ata_cable_40wire,
93 .set_mode = ixp4xx_set_mode,
96 static void ixp4xx_setup_port(struct ata_port *ap,
97 struct ixp4xx_pata_data *data,
98 unsigned long raw_cs0, unsigned long raw_cs1)
100 struct ata_ioports *ioaddr = &ap->ioaddr;
101 unsigned long raw_cmd = raw_cs0;
102 unsigned long raw_ctl = raw_cs1 + 0x06;
104 ioaddr->cmd_addr = data->cs0;
105 ioaddr->altstatus_addr = data->cs1 + 0x06;
106 ioaddr->ctl_addr = data->cs1 + 0x06;
108 ata_sff_std_ports(ioaddr);
112 /* adjust the addresses to handle the address swizzling of the
113 * ixp4xx in little endian mode.
116 *(unsigned long *)&ioaddr->data_addr ^= 0x02;
117 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
118 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
119 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
120 *(unsigned long *)&ioaddr->error_addr ^= 0x03;
121 *(unsigned long *)&ioaddr->feature_addr ^= 0x03;
122 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
123 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
124 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
125 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
126 *(unsigned long *)&ioaddr->device_addr ^= 0x03;
127 *(unsigned long *)&ioaddr->status_addr ^= 0x03;
128 *(unsigned long *)&ioaddr->command_addr ^= 0x03;
134 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
137 static int ixp4xx_pata_probe(struct platform_device *pdev)
139 struct resource *cs0, *cs1;
140 struct ata_host *host;
142 struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
146 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
147 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
153 host = ata_host_alloc(&pdev->dev, 1);
157 /* acquire resources and fill host */
158 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
162 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
163 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
165 if (!data->cs0 || !data->cs1)
168 irq = platform_get_irq(pdev, 0);
170 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
176 /* Setup expansion bus chip selects */
177 *data->cs0_cfg = data->cs0_bits;
178 *data->cs1_cfg = data->cs1_bits;
182 ap->ops = &ixp4xx_port_ops;
183 ap->pio_mask = ATA_PIO4;
184 ap->flags |= ATA_FLAG_NO_ATAPI;
186 ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
188 ata_print_version_once(&pdev->dev, DRV_VERSION);
191 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
194 static struct platform_driver ixp4xx_pata_platform_driver = {
198 .probe = ixp4xx_pata_probe,
199 .remove = ata_platform_remove_one,
202 module_platform_driver(ixp4xx_pata_platform_driver);
204 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
205 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
206 MODULE_LICENSE("GPL");
207 MODULE_VERSION(DRV_VERSION);
208 MODULE_ALIAS("platform:" DRV_NAME);