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7f1d5c9d BZ |
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 | ||
25df73d9 | 36 | static const struct scsi_host_template pata_falcon_sht = { |
7e11aabd BZ |
37 | ATA_PIO_SHT(DRV_NAME), |
38 | }; | |
39 | ||
40 | static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, | |
41 | unsigned char *buf, | |
42 | unsigned int buflen, int rw) | |
43 | { | |
44 | struct ata_device *dev = qc->dev; | |
45 | struct ata_port *ap = dev->link->ap; | |
46 | void __iomem *data_addr = ap->ioaddr.data_addr; | |
47 | unsigned int words = buflen >> 1; | |
48 | struct scsi_cmnd *cmd = qc->scsicmd; | |
49 | bool swap = 1; | |
50 | ||
c8329cd5 BVA |
51 | if (dev->class == ATA_DEV_ATA && cmd && |
52 | !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd))) | |
7e11aabd BZ |
53 | swap = 0; |
54 | ||
55 | /* Transfer multiple of 2 bytes */ | |
56 | if (rw == READ) { | |
57 | if (swap) | |
5fad5077 | 58 | raw_insw_swapw(data_addr, (u16 *)buf, words); |
7e11aabd | 59 | else |
5fad5077 | 60 | raw_insw(data_addr, (u16 *)buf, words); |
7e11aabd BZ |
61 | } else { |
62 | if (swap) | |
5fad5077 | 63 | raw_outsw_swapw(data_addr, (u16 *)buf, words); |
7e11aabd | 64 | else |
5fad5077 | 65 | raw_outsw(data_addr, (u16 *)buf, words); |
7e11aabd BZ |
66 | } |
67 | ||
68 | /* Transfer trailing byte, if any. */ | |
69 | if (unlikely(buflen & 0x01)) { | |
70 | unsigned char pad[2] = { }; | |
71 | ||
72 | /* Point buf to the tail of buffer */ | |
73 | buf += buflen - 1; | |
74 | ||
75 | if (rw == READ) { | |
76 | if (swap) | |
5fad5077 | 77 | raw_insw_swapw(data_addr, (u16 *)pad, 1); |
7e11aabd | 78 | else |
5fad5077 | 79 | raw_insw(data_addr, (u16 *)pad, 1); |
7e11aabd BZ |
80 | *buf = pad[0]; |
81 | } else { | |
82 | pad[0] = *buf; | |
83 | if (swap) | |
5fad5077 | 84 | raw_outsw_swapw(data_addr, (u16 *)pad, 1); |
7e11aabd | 85 | else |
5fad5077 | 86 | raw_outsw(data_addr, (u16 *)pad, 1); |
7e11aabd BZ |
87 | } |
88 | words++; | |
89 | } | |
90 | ||
91 | return words << 1; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Provide our own set_mode() as we don't want to change anything that has | |
96 | * already been configured.. | |
97 | */ | |
98 | static int pata_falcon_set_mode(struct ata_link *link, | |
99 | struct ata_device **unused) | |
100 | { | |
101 | struct ata_device *dev; | |
102 | ||
103 | ata_for_each_dev(dev, link, ENABLED) { | |
104 | /* We don't really care */ | |
105 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; | |
106 | dev->xfer_shift = ATA_SHIFT_PIO; | |
107 | dev->flags |= ATA_DFLAG_PIO; | |
108 | ata_dev_info(dev, "configured for PIO\n"); | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static struct ata_port_operations pata_falcon_ops = { | |
114 | .inherits = &ata_sff_port_ops, | |
115 | .sff_data_xfer = pata_falcon_data_xfer, | |
116 | .cable_detect = ata_cable_unknown, | |
117 | .set_mode = pata_falcon_set_mode, | |
118 | }; | |
119 | ||
5ed0794c | 120 | static int __init pata_falcon_init_one(struct platform_device *pdev) |
7e11aabd | 121 | { |
44b1fbc0 FT |
122 | struct resource *base_mem_res, *ctl_mem_res; |
123 | struct resource *base_res, *ctl_res, *irq_res; | |
7e11aabd BZ |
124 | struct ata_host *host; |
125 | struct ata_port *ap; | |
7e11aabd | 126 | void __iomem *base; |
44b1fbc0 | 127 | int irq = 0; |
7e11aabd | 128 | |
44b1fbc0 | 129 | dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); |
7e11aabd | 130 | |
44b1fbc0 FT |
131 | base_res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
132 | if (base_res && !devm_request_region(&pdev->dev, base_res->start, | |
133 | resource_size(base_res), DRV_NAME)) { | |
134 | dev_err(&pdev->dev, "resources busy\n"); | |
135 | return -EBUSY; | |
136 | } | |
7e11aabd | 137 | |
44b1fbc0 FT |
138 | ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); |
139 | if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start, | |
140 | resource_size(ctl_res), DRV_NAME)) { | |
5ed0794c | 141 | dev_err(&pdev->dev, "resources busy\n"); |
7e11aabd BZ |
142 | return -EBUSY; |
143 | } | |
144 | ||
44b1fbc0 FT |
145 | base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
146 | if (!base_mem_res) | |
147 | return -ENODEV; | |
148 | if (!devm_request_mem_region(&pdev->dev, base_mem_res->start, | |
149 | resource_size(base_mem_res), DRV_NAME)) { | |
150 | dev_err(&pdev->dev, "resources busy\n"); | |
151 | return -EBUSY; | |
152 | } | |
153 | ||
154 | ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
155 | if (!ctl_mem_res) | |
156 | return -ENODEV; | |
157 | ||
7e11aabd BZ |
158 | /* allocate host */ |
159 | host = ata_host_alloc(&pdev->dev, 1); | |
160 | if (!host) | |
161 | return -ENOMEM; | |
162 | ap = host->ports[0]; | |
163 | ||
164 | ap->ops = &pata_falcon_ops; | |
165 | ap->pio_mask = ATA_PIO4; | |
166 | ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; | |
7e11aabd | 167 | |
44b1fbc0 FT |
168 | base = (void __iomem *)base_mem_res->start; |
169 | /* N.B. this assumes data_addr will be used for word-sized I/O only */ | |
170 | ap->ioaddr.data_addr = base + 0 + 0 * 4; | |
7e11aabd BZ |
171 | ap->ioaddr.error_addr = base + 1 + 1 * 4; |
172 | ap->ioaddr.feature_addr = base + 1 + 1 * 4; | |
173 | ap->ioaddr.nsect_addr = base + 1 + 2 * 4; | |
174 | ap->ioaddr.lbal_addr = base + 1 + 3 * 4; | |
175 | ap->ioaddr.lbam_addr = base + 1 + 4 * 4; | |
176 | ap->ioaddr.lbah_addr = base + 1 + 5 * 4; | |
177 | ap->ioaddr.device_addr = base + 1 + 6 * 4; | |
178 | ap->ioaddr.status_addr = base + 1 + 7 * 4; | |
179 | ap->ioaddr.command_addr = base + 1 + 7 * 4; | |
180 | ||
44b1fbc0 FT |
181 | base = (void __iomem *)ctl_mem_res->start; |
182 | ap->ioaddr.altstatus_addr = base + 1; | |
183 | ap->ioaddr.ctl_addr = base + 1; | |
7e11aabd | 184 | |
44b1fbc0 FT |
185 | ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", |
186 | (unsigned long)base_mem_res->start, | |
187 | (unsigned long)ctl_mem_res->start); | |
188 | ||
189 | irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
190 | if (irq_res && irq_res->start > 0) { | |
191 | irq = irq_res->start; | |
192 | } else { | |
193 | ap->flags |= ATA_FLAG_PIO_POLLING; | |
194 | ata_port_desc(ap, "no IRQ, using PIO polling"); | |
195 | } | |
7e11aabd BZ |
196 | |
197 | /* activate */ | |
44b1fbc0 FT |
198 | return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, |
199 | IRQF_SHARED, &pata_falcon_sht); | |
7e11aabd BZ |
200 | } |
201 | ||
5ed0794c MS |
202 | static int __exit pata_falcon_remove_one(struct platform_device *pdev) |
203 | { | |
204 | struct ata_host *host = platform_get_drvdata(pdev); | |
205 | ||
206 | ata_host_detach(host); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static struct platform_driver pata_falcon_driver = { | |
212 | .remove = __exit_p(pata_falcon_remove_one), | |
213 | .driver = { | |
214 | .name = "atari-falcon-ide", | |
215 | }, | |
216 | }; | |
217 | ||
218 | module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one); | |
7e11aabd BZ |
219 | |
220 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); | |
221 | MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA"); | |
7f1d5c9d | 222 | MODULE_LICENSE("GPL v2"); |
5ed0794c | 223 | MODULE_ALIAS("platform:atari-falcon-ide"); |
7e11aabd | 224 | MODULE_VERSION(DRV_VERSION); |