Merge tag 'gpio-v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...
[sfrench/cifs-2.6.git] / drivers / ata / pata_ixp4xx_cf.c
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
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
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
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
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);