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 | |
32 | #define DRV_NAME "pata_falcon" |
33 | #define DRV_VERSION "0.1.0" |
34 | |
35 | static int pata_falcon_swap_mask; |
36 | |
37 | module_param_named(data_swab, pata_falcon_swap_mask, int, 0444); |
38 | MODULE_PARM_DESC(data_swab, "Data byte swap enable/disable bitmap (0x1==drive1, 0x2==drive2, 0x4==drive3, 0x8==drive4, default==0)" ); |
39 | |
40 | static const struct scsi_host_template pata_falcon_sht = { |
41 | ATA_PIO_SHT(DRV_NAME), |
42 | }; |
43 | |
44 | static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc, |
45 | unsigned char *buf, |
46 | unsigned int buflen, int rw) |
47 | { |
48 | struct ata_device *dev = qc->dev; |
49 | struct ata_port *ap = dev->link->ap; |
50 | void __iomem *data_addr = ap->ioaddr.data_addr; |
51 | unsigned int words = buflen >> 1; |
52 | struct scsi_cmnd *cmd = qc->scsicmd; |
53 | bool swap = 1; |
54 | |
55 | if (dev->class == ATA_DEV_ATA && cmd && |
56 | !blk_rq_is_passthrough(rq: scsi_cmd_to_rq(scmd: cmd))) |
57 | swap = (uintptr_t)ap->private_data & BIT(dev->devno); |
58 | |
59 | /* Transfer multiple of 2 bytes */ |
60 | if (rw == READ) { |
61 | if (swap) |
62 | raw_insw_swapw(data_addr, (u16 *)buf, words); |
63 | else |
64 | raw_insw(data_addr, (u16 *)buf, words); |
65 | } else { |
66 | if (swap) |
67 | raw_outsw_swapw(data_addr, (u16 *)buf, words); |
68 | else |
69 | raw_outsw(data_addr, (u16 *)buf, words); |
70 | } |
71 | |
72 | /* Transfer trailing byte, if any. */ |
73 | if (unlikely(buflen & 0x01)) { |
74 | unsigned char pad[2] = { }; |
75 | |
76 | /* Point buf to the tail of buffer */ |
77 | buf += buflen - 1; |
78 | |
79 | if (rw == READ) { |
80 | if (swap) |
81 | raw_insw_swapw(data_addr, (u16 *)pad, 1); |
82 | else |
83 | raw_insw(data_addr, (u16 *)pad, 1); |
84 | *buf = pad[0]; |
85 | } else { |
86 | pad[0] = *buf; |
87 | if (swap) |
88 | raw_outsw_swapw(data_addr, (u16 *)pad, 1); |
89 | else |
90 | raw_outsw(data_addr, (u16 *)pad, 1); |
91 | } |
92 | words++; |
93 | } |
94 | |
95 | return words << 1; |
96 | } |
97 | |
98 | /* |
99 | * Provide our own set_mode() as we don't want to change anything that has |
100 | * already been configured.. |
101 | */ |
102 | static int pata_falcon_set_mode(struct ata_link *link, |
103 | struct ata_device **unused) |
104 | { |
105 | struct ata_device *dev; |
106 | |
107 | ata_for_each_dev(dev, link, ENABLED) { |
108 | /* We don't really care */ |
109 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; |
110 | dev->xfer_shift = ATA_SHIFT_PIO; |
111 | dev->flags |= ATA_DFLAG_PIO; |
112 | ata_dev_info(dev, "configured for PIO\n" ); |
113 | } |
114 | return 0; |
115 | } |
116 | |
117 | static struct ata_port_operations pata_falcon_ops = { |
118 | .inherits = &ata_sff_port_ops, |
119 | .sff_data_xfer = pata_falcon_data_xfer, |
120 | .cable_detect = ata_cable_unknown, |
121 | .set_mode = pata_falcon_set_mode, |
122 | }; |
123 | |
124 | static int __init pata_falcon_init_one(struct platform_device *pdev) |
125 | { |
126 | struct resource *base_mem_res, *ctl_mem_res; |
127 | struct resource *base_res, *ctl_res, *irq_res; |
128 | struct ata_host *host; |
129 | struct ata_port *ap; |
130 | void __iomem *base, *ctl_base; |
131 | int mask_shift = 0; /* Q40 & Falcon default */ |
132 | int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */ |
133 | |
134 | dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n" ); |
135 | |
136 | base_res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
137 | if (base_res && !devm_request_region(&pdev->dev, base_res->start, |
138 | resource_size(base_res), DRV_NAME)) { |
139 | dev_err(&pdev->dev, "resources busy\n" ); |
140 | return -EBUSY; |
141 | } |
142 | |
143 | ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1); |
144 | if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start, |
145 | resource_size(ctl_res), DRV_NAME)) { |
146 | dev_err(&pdev->dev, "resources busy\n" ); |
147 | return -EBUSY; |
148 | } |
149 | |
150 | base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
151 | if (!base_mem_res) |
152 | return -ENODEV; |
153 | if (!devm_request_mem_region(&pdev->dev, base_mem_res->start, |
154 | resource_size(base_mem_res), DRV_NAME)) { |
155 | dev_err(&pdev->dev, "resources busy\n" ); |
156 | return -EBUSY; |
157 | } |
158 | |
159 | ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
160 | if (!ctl_mem_res) |
161 | return -ENODEV; |
162 | |
163 | /* allocate host */ |
164 | host = ata_host_alloc(dev: &pdev->dev, max_ports: 1); |
165 | if (!host) |
166 | return -ENOMEM; |
167 | ap = host->ports[0]; |
168 | |
169 | ap->ops = &pata_falcon_ops; |
170 | ap->pio_mask = ATA_PIO4; |
171 | ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; |
172 | |
173 | /* N.B. this assumes data_addr will be used for word-sized I/O only */ |
174 | ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start; |
175 | |
176 | if (base_res) { /* only Q40 has IO resources */ |
177 | io_offset = 0x10000; |
178 | reg_shift = 0; |
179 | base = (void __iomem *)base_res->start; |
180 | ctl_base = (void __iomem *)ctl_res->start; |
181 | } else { |
182 | base = (void __iomem *)base_mem_res->start; |
183 | ctl_base = (void __iomem *)ctl_mem_res->start; |
184 | } |
185 | |
186 | ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift); |
187 | ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift); |
188 | ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift); |
189 | ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift); |
190 | ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift); |
191 | ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift); |
192 | ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift); |
193 | ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift); |
194 | ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift); |
195 | |
196 | ap->ioaddr.altstatus_addr = ctl_base + io_offset; |
197 | ap->ioaddr.ctl_addr = ctl_base + io_offset; |
198 | |
199 | ata_port_desc(ap, fmt: "cmd %px ctl %px data %px" , |
200 | base, ctl_base, ap->ioaddr.data_addr); |
201 | |
202 | if (pdev->id > 0) |
203 | mask_shift = 2; |
204 | ap->private_data = (void *)(uintptr_t)(pata_falcon_swap_mask >> mask_shift); |
205 | |
206 | irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
207 | if (irq_res && irq_res->start > 0) { |
208 | irq = irq_res->start; |
209 | } else { |
210 | ap->flags |= ATA_FLAG_PIO_POLLING; |
211 | ata_port_desc(ap, fmt: "no IRQ, using PIO polling" ); |
212 | } |
213 | |
214 | /* activate */ |
215 | return ata_host_activate(host, irq, irq_handler: irq ? ata_sff_interrupt : NULL, |
216 | IRQF_SHARED, sht: &pata_falcon_sht); |
217 | } |
218 | |
219 | static int __exit pata_falcon_remove_one(struct platform_device *pdev) |
220 | { |
221 | struct ata_host *host = platform_get_drvdata(pdev); |
222 | |
223 | ata_host_detach(host); |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | static struct platform_driver pata_falcon_driver = { |
229 | .remove = __exit_p(pata_falcon_remove_one), |
230 | .driver = { |
231 | .name = "atari-falcon-ide" , |
232 | }, |
233 | }; |
234 | |
235 | module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one); |
236 | |
237 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz" ); |
238 | MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA" ); |
239 | MODULE_LICENSE("GPL v2" ); |
240 | MODULE_ALIAS("platform:atari-falcon-ide" ); |
241 | MODULE_VERSION(DRV_VERSION); |
242 | |