1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ixp4xx PATA/Compact Flash driver
4 * Copyright (C) 2006-07 Tower Technologies
5 * Author: Alessandro Zummo <a.zummo@towertech.it>
6 *
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
12 * polling mode.
13 */
14
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 <scsi/scsi_host.h>
21
22 #define DRV_NAME "pata_ixp4xx_cf"
23 #define DRV_VERSION "0.2"
24
ixp4xx_set_mode(struct ata_link * link,struct ata_device ** error)25 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
26 {
27 struct ata_device *dev;
28
29 ata_for_each_dev(dev, link, ENABLED) {
30 ata_dev_info(dev, "configured for PIO0\n");
31 dev->pio_mode = XFER_PIO_0;
32 dev->xfer_mode = XFER_PIO_0;
33 dev->xfer_shift = ATA_SHIFT_PIO;
34 dev->flags |= ATA_DFLAG_PIO;
35 }
36 return 0;
37 }
38
ixp4xx_mmio_data_xfer(struct ata_queued_cmd * qc,unsigned char * buf,unsigned int buflen,int rw)39 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
40 unsigned char *buf, unsigned int buflen, int rw)
41 {
42 unsigned int i;
43 unsigned int words = buflen >> 1;
44 u16 *buf16 = (u16 *) buf;
45 struct ata_port *ap = qc->dev->link->ap;
46 void __iomem *mmio = ap->ioaddr.data_addr;
47 struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
48
49 /* set the expansion bus in 16bit mode and restore
50 * 8 bit mode after the transaction.
51 */
52 *data->cs0_cfg &= ~(0x01);
53 udelay(100);
54
55 /* Transfer multiple of 2 bytes */
56 if (rw == READ)
57 for (i = 0; i < words; i++)
58 buf16[i] = readw(mmio);
59 else
60 for (i = 0; i < words; i++)
61 writew(buf16[i], mmio);
62
63 /* Transfer trailing 1 byte, if any. */
64 if (unlikely(buflen & 0x01)) {
65 u16 align_buf[1] = { 0 };
66 unsigned char *trailing_buf = buf + buflen - 1;
67
68 if (rw == READ) {
69 align_buf[0] = readw(mmio);
70 memcpy(trailing_buf, align_buf, 1);
71 } else {
72 memcpy(align_buf, trailing_buf, 1);
73 writew(align_buf[0], mmio);
74 }
75 words++;
76 }
77
78 udelay(100);
79 *data->cs0_cfg |= 0x01;
80
81 return words << 1;
82 }
83
84 static struct scsi_host_template ixp4xx_sht = {
85 ATA_PIO_SHT(DRV_NAME),
86 };
87
88 static struct ata_port_operations ixp4xx_port_ops = {
89 .inherits = &ata_sff_port_ops,
90 .sff_data_xfer = ixp4xx_mmio_data_xfer,
91 .cable_detect = ata_cable_40wire,
92 .set_mode = ixp4xx_set_mode,
93 };
94
ixp4xx_setup_port(struct ata_port * ap,struct ixp4xx_pata_data * data,unsigned long raw_cs0,unsigned long raw_cs1)95 static void ixp4xx_setup_port(struct ata_port *ap,
96 struct ixp4xx_pata_data *data,
97 unsigned long raw_cs0, unsigned long raw_cs1)
98 {
99 struct ata_ioports *ioaddr = &ap->ioaddr;
100 unsigned long raw_cmd = raw_cs0;
101 unsigned long raw_ctl = raw_cs1 + 0x06;
102
103 ioaddr->cmd_addr = data->cs0;
104 ioaddr->altstatus_addr = data->cs1 + 0x06;
105 ioaddr->ctl_addr = data->cs1 + 0x06;
106
107 ata_sff_std_ports(ioaddr);
108
109 #ifndef __ARMEB__
110
111 /* adjust the addresses to handle the address swizzling of the
112 * ixp4xx in little endian mode.
113 */
114
115 *(unsigned long *)&ioaddr->data_addr ^= 0x02;
116 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
117 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
118 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
119 *(unsigned long *)&ioaddr->error_addr ^= 0x03;
120 *(unsigned long *)&ioaddr->feature_addr ^= 0x03;
121 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
122 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
123 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
124 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
125 *(unsigned long *)&ioaddr->device_addr ^= 0x03;
126 *(unsigned long *)&ioaddr->status_addr ^= 0x03;
127 *(unsigned long *)&ioaddr->command_addr ^= 0x03;
128
129 raw_cmd ^= 0x03;
130 raw_ctl ^= 0x03;
131 #endif
132
133 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
134 }
135
ixp4xx_pata_probe(struct platform_device * pdev)136 static int ixp4xx_pata_probe(struct platform_device *pdev)
137 {
138 unsigned int irq;
139 struct resource *cs0, *cs1;
140 struct ata_host *host;
141 struct ata_port *ap;
142 struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
143 int ret;
144
145 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
146 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
147
148 if (!cs0 || !cs1)
149 return -EINVAL;
150
151 /* allocate host */
152 host = ata_host_alloc(&pdev->dev, 1);
153 if (!host)
154 return -ENOMEM;
155
156 /* acquire resources and fill host */
157 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
158 if (ret)
159 return ret;
160
161 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
162 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
163
164 if (!data->cs0 || !data->cs1)
165 return -ENOMEM;
166
167 irq = platform_get_irq(pdev, 0);
168 if (irq)
169 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
170
171 /* Setup expansion bus chip selects */
172 *data->cs0_cfg = data->cs0_bits;
173 *data->cs1_cfg = data->cs1_bits;
174
175 ap = host->ports[0];
176
177 ap->ops = &ixp4xx_port_ops;
178 ap->pio_mask = ATA_PIO4;
179 ap->flags |= ATA_FLAG_NO_ATAPI;
180
181 ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
182
183 ata_print_version_once(&pdev->dev, DRV_VERSION);
184
185 /* activate host */
186 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
187 }
188
189 static struct platform_driver ixp4xx_pata_platform_driver = {
190 .driver = {
191 .name = DRV_NAME,
192 },
193 .probe = ixp4xx_pata_probe,
194 .remove = ata_platform_remove_one,
195 };
196
197 module_platform_driver(ixp4xx_pata_platform_driver);
198
199 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
200 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
201 MODULE_LICENSE("GPL");
202 MODULE_VERSION(DRV_VERSION);
203 MODULE_ALIAS("platform:" DRV_NAME);
204
