Merge tag 'soc-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[linux-2.6-microblaze.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 <linux/platform_data/pata_ixp4xx_cf.h>
21 #include <scsi/scsi_host.h>
22
23 #define DRV_NAME        "pata_ixp4xx_cf"
24 #define DRV_VERSION     "0.2"
25
26 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
27 {
28         struct ata_device *dev;
29
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;
36         }
37         return 0;
38 }
39
40 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc,
41                                 unsigned char *buf, unsigned int buflen, int rw)
42 {
43         unsigned int i;
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);
49
50         /* set the expansion bus in 16bit mode and restore
51          * 8 bit mode after the transaction.
52          */
53         *data->cs0_cfg &= ~(0x01);
54         udelay(100);
55
56         /* Transfer multiple of 2 bytes */
57         if (rw == READ)
58                 for (i = 0; i < words; i++)
59                         buf16[i] = readw(mmio);
60         else
61                 for (i = 0; i < words; i++)
62                         writew(buf16[i], mmio);
63
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;
68
69                 if (rw == READ) {
70                         align_buf[0] = readw(mmio);
71                         memcpy(trailing_buf, align_buf, 1);
72                 } else {
73                         memcpy(align_buf, trailing_buf, 1);
74                         writew(align_buf[0], mmio);
75                 }
76                 words++;
77         }
78
79         udelay(100);
80         *data->cs0_cfg |= 0x01;
81
82         return words << 1;
83 }
84
85 static struct scsi_host_template ixp4xx_sht = {
86         ATA_PIO_SHT(DRV_NAME),
87 };
88
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,
94 };
95
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)
99 {
100         struct ata_ioports *ioaddr = &ap->ioaddr;
101         unsigned long raw_cmd = raw_cs0;
102         unsigned long raw_ctl = raw_cs1 + 0x06;
103
104         ioaddr->cmd_addr        = data->cs0;
105         ioaddr->altstatus_addr  = data->cs1 + 0x06;
106         ioaddr->ctl_addr        = data->cs1 + 0x06;
107
108         ata_sff_std_ports(ioaddr);
109
110 #ifndef __ARMEB__
111
112         /* adjust the addresses to handle the address swizzling of the
113          * ixp4xx in little endian mode.
114          */
115
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;
129
130         raw_cmd ^= 0x03;
131         raw_ctl ^= 0x03;
132 #endif
133
134         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
135 }
136
137 static int ixp4xx_pata_probe(struct platform_device *pdev)
138 {
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         int irq;
145
146         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
147         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
148
149         if (!cs0 || !cs1)
150                 return -EINVAL;
151
152         /* allocate host */
153         host = ata_host_alloc(&pdev->dev, 1);
154         if (!host)
155                 return -ENOMEM;
156
157         /* acquire resources and fill host */
158         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
159         if (ret)
160                 return ret;
161
162         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
163         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
164
165         if (!data->cs0 || !data->cs1)
166                 return -ENOMEM;
167
168         irq = platform_get_irq(pdev, 0);
169         if (irq > 0)
170                 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
171         else if (irq < 0)
172                 return irq;
173         else
174                 return -EINVAL;
175
176         /* Setup expansion bus chip selects */
177         *data->cs0_cfg = data->cs0_bits;
178         *data->cs1_cfg = data->cs1_bits;
179
180         ap = host->ports[0];
181
182         ap->ops = &ixp4xx_port_ops;
183         ap->pio_mask = ATA_PIO4;
184         ap->flags |= ATA_FLAG_NO_ATAPI;
185
186         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
187
188         ata_print_version_once(&pdev->dev, DRV_VERSION);
189
190         /* activate host */
191         return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
192 }
193
194 static struct platform_driver ixp4xx_pata_platform_driver = {
195         .driver  = {
196                 .name   = DRV_NAME,
197         },
198         .probe          = ixp4xx_pata_probe,
199         .remove         = ata_platform_remove_one,
200 };
201
202 module_platform_driver(ixp4xx_pata_platform_driver);
203
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);