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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
7e11aabd BZ |
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 | |
7e11aabd BZ |
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 | ||
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 && | |
79f4d1d5 | 55 | !blk_rq_is_passthrough(cmd->request)) |
7e11aabd BZ |
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 | */ | |
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 | ||
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"); | |
7f1d5c9d | 181 | MODULE_LICENSE("GPL v2"); |
7e11aabd | 182 | MODULE_VERSION(DRV_VERSION); |