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