1 // SPDX-License-Identifier: GPL-2.0
2
3 /*
4 * Atari Falcon PATA controller driver
5 *
6 * Copyright (c) 2016 Samsung Electronics Co., Ltd.
7 * http://www.samsung.com
8 *
9 * Based on falconide.c:
10 *
11 * Created 12 Jul 1997 by Geert Uytterhoeven
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/blkdev.h>
18 #include <linux/delay.h>
19 #include <scsi/scsi_host.h>
20 #include <scsi/scsi_cmnd.h>
21 #include <linux/ata.h>
22 #include <linux/libata.h>
23 #include <linux/mm.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26
27 #include <asm/setup.h>
28 #include <asm/atarihw.h>
29 #include <asm/atariints.h>
30 #include <asm/atari_stdma.h>
31 #include <asm/ide.h>
32
33 #define DRV_NAME "pata_falcon"
34 #define DRV_VERSION "0.1.0"
35
36 #define ATA_HD_CONTROL 0x39
37
38 static struct scsi_host_template pata_falcon_sht = {
39 ATA_PIO_SHT(DRV_NAME),
40 };
41
pata_falcon_data_xfer(struct ata_queued_cmd * qc,unsigned char * buf,unsigned int buflen,int rw)42 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
43 unsigned char *buf,
44 unsigned int buflen, int rw)
45 {
46 struct ata_device *dev = qc->dev;
47 struct ata_port *ap = dev->link->ap;
48 void __iomem *data_addr = ap->ioaddr.data_addr;
49 unsigned int words = buflen >> 1;
50 struct scsi_cmnd *cmd = qc->scsicmd;
51 bool swap = 1;
52
53 if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
54 !blk_rq_is_passthrough(cmd->request))
55 swap = 0;
56
57 /* Transfer multiple of 2 bytes */
58 if (rw == READ) {
59 if (swap)
60 raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
61 else
62 raw_insw((u16 *)data_addr, (u16 *)buf, words);
63 } else {
64 if (swap)
65 raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
66 else
67 raw_outsw((u16 *)data_addr, (u16 *)buf, words);
68 }
69
70 /* Transfer trailing byte, if any. */
71 if (unlikely(buflen & 0x01)) {
72 unsigned char pad[2] = { };
73
74 /* Point buf to the tail of buffer */
75 buf += buflen - 1;
76
77 if (rw == READ) {
78 if (swap)
79 raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
80 else
81 raw_insw((u16 *)data_addr, (u16 *)pad, 1);
82 *buf = pad[0];
83 } else {
84 pad[0] = *buf;
85 if (swap)
86 raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
87 else
88 raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
89 }
90 words++;
91 }
92
93 return words << 1;
94 }
95
96 /*
97 * Provide our own set_mode() as we don't want to change anything that has
98 * already been configured..
99 */
pata_falcon_set_mode(struct ata_link * link,struct ata_device ** unused)100 static int pata_falcon_set_mode(struct ata_link *link,
101 struct ata_device **unused)
102 {
103 struct ata_device *dev;
104
105 ata_for_each_dev(dev, link, ENABLED) {
106 /* We don't really care */
107 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
108 dev->xfer_shift = ATA_SHIFT_PIO;
109 dev->flags |= ATA_DFLAG_PIO;
110 ata_dev_info(dev, "configured for PIO\n");
111 }
112 return 0;
113 }
114
115 static struct ata_port_operations pata_falcon_ops = {
116 .inherits = &ata_sff_port_ops,
117 .sff_data_xfer = pata_falcon_data_xfer,
118 .cable_detect = ata_cable_unknown,
119 .set_mode = pata_falcon_set_mode,
120 };
121
pata_falcon_init_one(struct platform_device * pdev)122 static int __init pata_falcon_init_one(struct platform_device *pdev)
123 {
124 struct resource *res;
125 struct ata_host *host;
126 struct ata_port *ap;
127 void __iomem *base;
128
129 dev_info(&pdev->dev, "Atari Falcon PATA controller\n");
130
131 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
132 if (!res)
133 return -ENODEV;
134
135 if (!devm_request_mem_region(&pdev->dev, res->start,
136 resource_size(res), DRV_NAME)) {
137 dev_err(&pdev->dev, "resources busy\n");
138 return -EBUSY;
139 }
140
141 /* allocate host */
142 host = ata_host_alloc(&pdev->dev, 1);
143 if (!host)
144 return -ENOMEM;
145 ap = host->ports[0];
146
147 ap->ops = &pata_falcon_ops;
148 ap->pio_mask = ATA_PIO4;
149 ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
150 ap->flags |= ATA_FLAG_PIO_POLLING;
151
152 base = (void __iomem *)res->start;
153 ap->ioaddr.data_addr = base;
154 ap->ioaddr.error_addr = base + 1 + 1 * 4;
155 ap->ioaddr.feature_addr = base + 1 + 1 * 4;
156 ap->ioaddr.nsect_addr = base + 1 + 2 * 4;
157 ap->ioaddr.lbal_addr = base + 1 + 3 * 4;
158 ap->ioaddr.lbam_addr = base + 1 + 4 * 4;
159 ap->ioaddr.lbah_addr = base + 1 + 5 * 4;
160 ap->ioaddr.device_addr = base + 1 + 6 * 4;
161 ap->ioaddr.status_addr = base + 1 + 7 * 4;
162 ap->ioaddr.command_addr = base + 1 + 7 * 4;
163
164 ap->ioaddr.altstatus_addr = base + ATA_HD_CONTROL;
165 ap->ioaddr.ctl_addr = base + ATA_HD_CONTROL;
166
167 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
168 (unsigned long)base + ATA_HD_CONTROL);
169
170 /* activate */
171 return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
172 }
173
pata_falcon_remove_one(struct platform_device * pdev)174 static int __exit pata_falcon_remove_one(struct platform_device *pdev)
175 {
176 struct ata_host *host = platform_get_drvdata(pdev);
177
178 ata_host_detach(host);
179
180 return 0;
181 }
182
183 static struct platform_driver pata_falcon_driver = {
184 .remove = __exit_p(pata_falcon_remove_one),
185 .driver = {
186 .name = "atari-falcon-ide",
187 },
188 };
189
190 module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
191
192 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
193 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
194 MODULE_LICENSE("GPL v2");
195 MODULE_ALIAS("platform:atari-falcon-ide");
196 MODULE_VERSION(DRV_VERSION);
197