1 /*
2 * ixp4xx PATA/Compact Flash driver
3 * Copyright (C) 2006-07 Tower Technologies
4 * Author: Alessandro Zummo <a.zummo@towertech.it>
5 *
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.
12 *
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.
16 *
17 */
18
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>
25
26 #define DRV_NAME "pata_ixp4xx_cf"
27 #define DRV_VERSION "0.2"
28
ixp4xx_set_mode(struct ata_link * link,struct ata_device ** error)29 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
30 {
31 struct ata_device *dev;
32
33 ata_for_each_dev(dev, link, ENABLED) {
34 ata_dev_info(dev, "configured for PIO0\n");
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;
39 }
40 return 0;
41 }
42
ixp4xx_mmio_data_xfer(struct ata_queued_cmd * qc,unsigned char * buf,unsigned int buflen,int rw)43 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
44 unsigned char *buf, unsigned int buflen, int rw)
45 {
46 unsigned int i;
47 unsigned int words = buflen >> 1;
48 u16 *buf16 = (u16 *) buf;
49 struct ata_port *ap = qc->dev->link->ap;
50 void __iomem *mmio = ap->ioaddr.data_addr;
51 struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
52
53 /* set the expansion bus in 16bit mode and restore
54 * 8 bit mode after the transaction.
55 */
56 *data->cs0_cfg &= ~(0x01);
57 udelay(100);
58
59 /* Transfer multiple of 2 bytes */
60 if (rw == READ)
61 for (i = 0; i < words; i++)
62 buf16[i] = readw(mmio);
63 else
64 for (i = 0; i < words; i++)
65 writew(buf16[i], mmio);
66
67 /* Transfer trailing 1 byte, if any. */
68 if (unlikely(buflen & 0x01)) {
69 u16 align_buf[1] = { 0 };
70 unsigned char *trailing_buf = buf + buflen - 1;
71
72 if (rw == READ) {
73 align_buf[0] = readw(mmio);
74 memcpy(trailing_buf, align_buf, 1);
75 } else {
76 memcpy(align_buf, trailing_buf, 1);
77 writew(align_buf[0], mmio);
78 }
79 words++;
80 }
81
82 udelay(100);
83 *data->cs0_cfg |= 0x01;
84
85 return words << 1;
86 }
87
88 static struct scsi_host_template ixp4xx_sht = {
89 ATA_PIO_SHT(DRV_NAME),
90 };
91
92 static struct ata_port_operations ixp4xx_port_ops = {
93 .inherits = &ata_sff_port_ops,
94 .sff_data_xfer = ixp4xx_mmio_data_xfer,
95 .cable_detect = ata_cable_40wire,
96 .set_mode = ixp4xx_set_mode,
97 };
98
ixp4xx_setup_port(struct ata_port * ap,struct ixp4xx_pata_data * data,unsigned long raw_cs0,unsigned long raw_cs1)99 static void ixp4xx_setup_port(struct ata_port *ap,
100 struct ixp4xx_pata_data *data,
101 unsigned long raw_cs0, unsigned long raw_cs1)
102 {
103 struct ata_ioports *ioaddr = &ap->ioaddr;
104 unsigned long raw_cmd = raw_cs0;
105 unsigned long raw_ctl = raw_cs1 + 0x06;
106
107 ioaddr->cmd_addr = data->cs0;
108 ioaddr->altstatus_addr = data->cs1 + 0x06;
109 ioaddr->ctl_addr = data->cs1 + 0x06;
110
111 ata_sff_std_ports(ioaddr);
112
113 #ifndef __ARMEB__
114
115 /* adjust the addresses to handle the address swizzling of the
116 * ixp4xx in little endian mode.
117 */
118
119 *(unsigned long *)&ioaddr->data_addr ^= 0x02;
120 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03;
121 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03;
122 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03;
123 *(unsigned long *)&ioaddr->error_addr ^= 0x03;
124 *(unsigned long *)&ioaddr->feature_addr ^= 0x03;
125 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03;
126 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03;
127 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03;
128 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03;
129 *(unsigned long *)&ioaddr->device_addr ^= 0x03;
130 *(unsigned long *)&ioaddr->status_addr ^= 0x03;
131 *(unsigned long *)&ioaddr->command_addr ^= 0x03;
132
133 raw_cmd ^= 0x03;
134 raw_ctl ^= 0x03;
135 #endif
136
137 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
138 }
139
ixp4xx_pata_probe(struct platform_device * pdev)140 static int ixp4xx_pata_probe(struct platform_device *pdev)
141 {
142 unsigned int irq;
143 struct resource *cs0, *cs1;
144 struct ata_host *host;
145 struct ata_port *ap;
146 struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
147 int ret;
148
149 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
151
152 if (!cs0 || !cs1)
153 return -EINVAL;
154
155 /* allocate host */
156 host = ata_host_alloc(&pdev->dev, 1);
157 if (!host)
158 return -ENOMEM;
159
160 /* acquire resources and fill host */
161 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
162 if (ret)
163 return ret;
164
165 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
166 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
167
168 if (!data->cs0 || !data->cs1)
169 return -ENOMEM;
170
171 irq = platform_get_irq(pdev, 0);
172 if (irq)
173 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
174
175 /* Setup expansion bus chip selects */
176 *data->cs0_cfg = data->cs0_bits;
177 *data->cs1_cfg = data->cs1_bits;
178
179 ap = host->ports[0];
180
181 ap->ops = &ixp4xx_port_ops;
182 ap->pio_mask = ATA_PIO4;
183 ap->flags |= ATA_FLAG_NO_ATAPI;
184
185 ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
186
187 ata_print_version_once(&pdev->dev, DRV_VERSION);
188
189 /* activate host */
190 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
191 }
192
193 static struct platform_driver ixp4xx_pata_platform_driver = {
194 .driver = {
195 .name = DRV_NAME,
196 },
197 .probe = ixp4xx_pata_probe,
198 .remove = ata_platform_remove_one,
199 };
200
201 module_platform_driver(ixp4xx_pata_platform_driver);
202
203 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
204 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
205 MODULE_LICENSE("GPL");
206 MODULE_VERSION(DRV_VERSION);
207 MODULE_ALIAS("platform:" DRV_NAME);
208
