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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | /* | |
4 | * Amiga Gayle PATA controller driver | |
5 | * | |
6 | * Copyright (c) 2018 Samsung Electronics Co., Ltd. | |
7 | * http://www.samsung.com | |
8 | * | |
9 | * Based on gayle.c: | |
10 | * | |
11 | * Created 12 Jul 1997 by Geert Uytterhoeven | |
12 | */ | |
13 | ||
14 | #include <linux/ata.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/libata.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/zorro.h> | |
24 | #include <scsi/scsi_cmnd.h> | |
25 | #include <scsi/scsi_host.h> | |
26 | ||
27 | #include <asm/amigahw.h> | |
28 | #include <asm/amigaints.h> | |
29 | #include <asm/amigayle.h> | |
30 | #include <asm/ide.h> | |
31 | #include <asm/setup.h> | |
32 | ||
33 | #define DRV_NAME "pata_gayle" | |
34 | #define DRV_VERSION "0.1.0" | |
35 | ||
36 | #define GAYLE_CONTROL 0x101a | |
37 | ||
38 | static struct scsi_host_template pata_gayle_sht = { | |
39 | ATA_PIO_SHT(DRV_NAME), | |
40 | }; | |
41 | ||
42 | /* FIXME: is this needed? */ | |
43 | static unsigned int pata_gayle_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 | ||
52 | /* Transfer multiple of 2 bytes */ | |
53 | if (rw == READ) | |
54 | raw_insw((u16 *)data_addr, (u16 *)buf, words); | |
55 | else | |
56 | raw_outsw((u16 *)data_addr, (u16 *)buf, words); | |
57 | ||
58 | /* Transfer trailing byte, if any. */ | |
59 | if (unlikely(buflen & 0x01)) { | |
60 | unsigned char pad[2] = { }; | |
61 | ||
62 | /* Point buf to the tail of buffer */ | |
63 | buf += buflen - 1; | |
64 | ||
65 | if (rw == READ) { | |
66 | raw_insw((u16 *)data_addr, (u16 *)pad, 1); | |
67 | *buf = pad[0]; | |
68 | } else { | |
69 | pad[0] = *buf; | |
70 | raw_outsw((u16 *)data_addr, (u16 *)pad, 1); | |
71 | } | |
72 | words++; | |
73 | } | |
74 | ||
75 | return words << 1; | |
76 | } | |
77 | ||
78 | /* | |
79 | * Provide our own set_mode() as we don't want to change anything that has | |
80 | * already been configured.. | |
81 | */ | |
82 | static int pata_gayle_set_mode(struct ata_link *link, | |
83 | struct ata_device **unused) | |
84 | { | |
85 | struct ata_device *dev; | |
86 | ||
87 | ata_for_each_dev(dev, link, ENABLED) { | |
88 | /* We don't really care */ | |
89 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; | |
90 | dev->xfer_shift = ATA_SHIFT_PIO; | |
91 | dev->flags |= ATA_DFLAG_PIO; | |
92 | ata_dev_info(dev, "configured for PIO\n"); | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static bool pata_gayle_irq_check(struct ata_port *ap) | |
98 | { | |
99 | u8 ch; | |
100 | ||
101 | ch = z_readb((unsigned long)ap->private_data); | |
102 | ||
103 | return !!(ch & GAYLE_IRQ_IDE); | |
104 | } | |
105 | ||
106 | static void pata_gayle_irq_clear(struct ata_port *ap) | |
107 | { | |
108 | (void)z_readb((unsigned long)ap->ioaddr.status_addr); | |
109 | z_writeb(0x7c, (unsigned long)ap->private_data); | |
110 | } | |
111 | ||
112 | static struct ata_port_operations pata_gayle_a1200_ops = { | |
113 | .inherits = &ata_sff_port_ops, | |
114 | .sff_data_xfer = pata_gayle_data_xfer, | |
115 | .sff_irq_check = pata_gayle_irq_check, | |
116 | .sff_irq_clear = pata_gayle_irq_clear, | |
117 | .cable_detect = ata_cable_unknown, | |
118 | .set_mode = pata_gayle_set_mode, | |
119 | }; | |
120 | ||
121 | static struct ata_port_operations pata_gayle_a4000_ops = { | |
122 | .inherits = &ata_sff_port_ops, | |
123 | .sff_data_xfer = pata_gayle_data_xfer, | |
124 | .cable_detect = ata_cable_unknown, | |
125 | .set_mode = pata_gayle_set_mode, | |
126 | }; | |
127 | ||
128 | static int __init pata_gayle_init_one(struct platform_device *pdev) | |
129 | { | |
130 | struct resource *res; | |
131 | struct gayle_ide_platform_data *pdata; | |
132 | struct ata_host *host; | |
133 | struct ata_port *ap; | |
134 | void __iomem *base; | |
135 | int ret; | |
136 | ||
137 | pdata = dev_get_platdata(&pdev->dev); | |
138 | ||
139 | dev_info(&pdev->dev, "Amiga Gayle IDE controller (A%u style)\n", | |
140 | pdata->explicit_ack ? 1200 : 4000); | |
141 | ||
142 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
143 | if (!res) | |
144 | return -ENODEV; | |
145 | ||
146 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
147 | resource_size(res), DRV_NAME)) { | |
148 | pr_err(DRV_NAME ": resources busy\n"); | |
149 | return -EBUSY; | |
150 | } | |
151 | ||
152 | /* allocate host */ | |
153 | host = ata_host_alloc(&pdev->dev, 1); | |
154 | if (!host) | |
155 | return -ENOMEM; | |
156 | ||
157 | ap = host->ports[0]; | |
158 | ||
159 | if (pdata->explicit_ack) | |
160 | ap->ops = &pata_gayle_a1200_ops; | |
161 | else | |
162 | ap->ops = &pata_gayle_a4000_ops; | |
163 | ||
164 | ap->pio_mask = ATA_PIO4; | |
165 | ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; | |
166 | ||
167 | base = ZTWO_VADDR(pdata->base); | |
168 | ap->ioaddr.data_addr = base; | |
169 | ap->ioaddr.error_addr = base + 2 + 1 * 4; | |
170 | ap->ioaddr.feature_addr = base + 2 + 1 * 4; | |
171 | ap->ioaddr.nsect_addr = base + 2 + 2 * 4; | |
172 | ap->ioaddr.lbal_addr = base + 2 + 3 * 4; | |
173 | ap->ioaddr.lbam_addr = base + 2 + 4 * 4; | |
174 | ap->ioaddr.lbah_addr = base + 2 + 5 * 4; | |
175 | ap->ioaddr.device_addr = base + 2 + 6 * 4; | |
176 | ap->ioaddr.status_addr = base + 2 + 7 * 4; | |
177 | ap->ioaddr.command_addr = base + 2 + 7 * 4; | |
178 | ||
179 | ap->ioaddr.altstatus_addr = base + GAYLE_CONTROL; | |
180 | ap->ioaddr.ctl_addr = base + GAYLE_CONTROL; | |
181 | ||
182 | ap->private_data = (void *)ZTWO_VADDR(pdata->irqport); | |
183 | ||
184 | ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", pdata->base, | |
185 | pdata->base + GAYLE_CONTROL); | |
186 | ||
187 | ret = ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt, | |
188 | IRQF_SHARED, &pata_gayle_sht); | |
189 | if (ret) | |
190 | return ret; | |
191 | ||
192 | platform_set_drvdata(pdev, host); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int __exit pata_gayle_remove_one(struct platform_device *pdev) | |
198 | { | |
199 | struct ata_host *host = platform_get_drvdata(pdev); | |
200 | ||
201 | ata_host_detach(host); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static struct platform_driver pata_gayle_driver = { | |
207 | .remove = __exit_p(pata_gayle_remove_one), | |
208 | .driver = { | |
209 | .name = "amiga-gayle-ide", | |
210 | }, | |
211 | }; | |
212 | ||
213 | module_platform_driver_probe(pata_gayle_driver, pata_gayle_init_one); | |
214 | ||
215 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); | |
216 | MODULE_DESCRIPTION("low-level driver for Amiga Gayle PATA"); | |
217 | MODULE_LICENSE("GPL v2"); | |
218 | MODULE_ALIAS("platform:amiga-gayle-ide"); | |
219 | MODULE_VERSION(DRV_VERSION); |