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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_BASE	0xfff00000
37 #define ATA_HD_CONTROL	0x39
38 
39 static struct scsi_host_template pata_falcon_sht = {
40 	ATA_PIO_SHT(DRV_NAME),
41 };
42 
pata_falcon_data_xfer(struct ata_queued_cmd * qc,unsigned char * buf,unsigned int buflen,int rw)43 static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
44 					  unsigned char *buf,
45 					  unsigned int buflen, int rw)
46 {
47 	struct ata_device *dev = qc->dev;
48 	struct ata_port *ap = dev->link->ap;
49 	void __iomem *data_addr = ap->ioaddr.data_addr;
50 	unsigned int words = buflen >> 1;
51 	struct scsi_cmnd *cmd = qc->scsicmd;
52 	bool swap = 1;
53 
54 	if (dev->class == ATA_DEV_ATA && cmd && cmd->request &&
55 	    !blk_rq_is_passthrough(cmd->request))
56 		swap = 0;
57 
58 	/* Transfer multiple of 2 bytes */
59 	if (rw == READ) {
60 		if (swap)
61 			raw_insw_swapw((u16 *)data_addr, (u16 *)buf, words);
62 		else
63 			raw_insw((u16 *)data_addr, (u16 *)buf, words);
64 	} else {
65 		if (swap)
66 			raw_outsw_swapw((u16 *)data_addr, (u16 *)buf, words);
67 		else
68 			raw_outsw((u16 *)data_addr, (u16 *)buf, words);
69 	}
70 
71 	/* Transfer trailing byte, if any. */
72 	if (unlikely(buflen & 0x01)) {
73 		unsigned char pad[2] = { };
74 
75 		/* Point buf to the tail of buffer */
76 		buf += buflen - 1;
77 
78 		if (rw == READ) {
79 			if (swap)
80 				raw_insw_swapw((u16 *)data_addr, (u16 *)pad, 1);
81 			else
82 				raw_insw((u16 *)data_addr, (u16 *)pad, 1);
83 			*buf = pad[0];
84 		} else {
85 			pad[0] = *buf;
86 			if (swap)
87 				raw_outsw_swapw((u16 *)data_addr, (u16 *)pad, 1);
88 			else
89 				raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
90 		}
91 		words++;
92 	}
93 
94 	return words << 1;
95 }
96 
97 /*
98  * Provide our own set_mode() as we don't want to change anything that has
99  * already been configured..
100  */
pata_falcon_set_mode(struct ata_link * link,struct ata_device ** unused)101 static int pata_falcon_set_mode(struct ata_link *link,
102 				struct ata_device **unused)
103 {
104 	struct ata_device *dev;
105 
106 	ata_for_each_dev(dev, link, ENABLED) {
107 		/* We don't really care */
108 		dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
109 		dev->xfer_shift = ATA_SHIFT_PIO;
110 		dev->flags |= ATA_DFLAG_PIO;
111 		ata_dev_info(dev, "configured for PIO\n");
112 	}
113 	return 0;
114 }
115 
116 static struct ata_port_operations pata_falcon_ops = {
117 	.inherits	= &ata_sff_port_ops,
118 	.sff_data_xfer	= pata_falcon_data_xfer,
119 	.cable_detect	= ata_cable_unknown,
120 	.set_mode	= pata_falcon_set_mode,
121 };
122 
pata_falcon_init_one(void)123 static int pata_falcon_init_one(void)
124 {
125 	struct ata_host *host;
126 	struct ata_port *ap;
127 	struct platform_device *pdev;
128 	void __iomem *base;
129 
130 	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
131 		return -ENODEV;
132 
133 	pr_info(DRV_NAME ": Atari Falcon PATA controller\n");
134 
135 	pdev = platform_device_register_simple(DRV_NAME, 0, NULL, 0);
136 	if (IS_ERR(pdev))
137 		return PTR_ERR(pdev);
138 
139 	if (!devm_request_mem_region(&pdev->dev, ATA_HD_BASE, 0x40, DRV_NAME)) {
140 		pr_err(DRV_NAME ": resources busy\n");
141 		return -EBUSY;
142 	}
143 
144 	/* allocate host */
145 	host = ata_host_alloc(&pdev->dev, 1);
146 	if (!host)
147 		return -ENOMEM;
148 	ap = host->ports[0];
149 
150 	ap->ops = &pata_falcon_ops;
151 	ap->pio_mask = ATA_PIO4;
152 	ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
153 	ap->flags |= ATA_FLAG_PIO_POLLING;
154 
155 	base = (void __iomem *)ATA_HD_BASE;
156 	ap->ioaddr.data_addr		= base;
157 	ap->ioaddr.error_addr		= base + 1 + 1 * 4;
158 	ap->ioaddr.feature_addr		= base + 1 + 1 * 4;
159 	ap->ioaddr.nsect_addr		= base + 1 + 2 * 4;
160 	ap->ioaddr.lbal_addr		= base + 1 + 3 * 4;
161 	ap->ioaddr.lbam_addr		= base + 1 + 4 * 4;
162 	ap->ioaddr.lbah_addr		= base + 1 + 5 * 4;
163 	ap->ioaddr.device_addr		= base + 1 + 6 * 4;
164 	ap->ioaddr.status_addr		= base + 1 + 7 * 4;
165 	ap->ioaddr.command_addr		= base + 1 + 7 * 4;
166 
167 	ap->ioaddr.altstatus_addr	= base + ATA_HD_CONTROL;
168 	ap->ioaddr.ctl_addr		= base + ATA_HD_CONTROL;
169 
170 	ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", (unsigned long)base,
171 		      (unsigned long)base + ATA_HD_CONTROL);
172 
173 	/* activate */
174 	return ata_host_activate(host, 0, NULL, 0, &pata_falcon_sht);
175 }
176 
177 module_init(pata_falcon_init_one);
178 
179 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
180 MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
181 MODULE_LICENSE("GPL v2");
182 MODULE_VERSION(DRV_VERSION);
183