1 | // SPDX-License-Identifier: GPL-2.0 |
2 | |
3 | /* |
4 | * Buddha, Catweasel and X-Surf PATA controller driver |
5 | * |
6 | * Copyright (c) 2018 Samsung Electronics Co., Ltd. |
7 | * http://www.samsung.com |
8 | * |
9 | * Based on buddha.c: |
10 | * |
11 | * Copyright (C) 1997, 2001 by Geert Uytterhoeven and others |
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/mod_devicetable.h> |
22 | #include <linux/module.h> |
23 | #include <linux/types.h> |
24 | #include <linux/zorro.h> |
25 | #include <scsi/scsi_cmnd.h> |
26 | #include <scsi/scsi_host.h> |
27 | |
28 | #include <asm/amigahw.h> |
29 | #include <asm/amigaints.h> |
30 | #include <asm/setup.h> |
31 | |
32 | #define DRV_NAME "pata_buddha" |
33 | #define DRV_VERSION "0.1.1" |
34 | |
35 | #define BUDDHA_BASE1 0x800 |
36 | #define BUDDHA_BASE2 0xa00 |
37 | #define BUDDHA_BASE3 0xc00 |
38 | #define XSURF_BASE1 0xb000 /* 2.5" interface */ |
39 | #define XSURF_BASE2 0xd000 /* 3.5" interface */ |
40 | #define BUDDHA_CONTROL 0x11a |
41 | #define BUDDHA_IRQ 0xf00 |
42 | #define XSURF_IRQ 0x7e |
43 | #define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */ |
44 | |
45 | enum { |
46 | BOARD_BUDDHA = 0, |
47 | BOARD_CATWEASEL, |
48 | BOARD_XSURF |
49 | }; |
50 | |
51 | static unsigned int buddha_bases[3] = { |
52 | BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3 |
53 | }; |
54 | |
55 | static unsigned int xsurf_bases[2] = { |
56 | XSURF_BASE1, XSURF_BASE2 |
57 | }; |
58 | |
59 | static const struct scsi_host_template pata_buddha_sht = { |
60 | ATA_PIO_SHT(DRV_NAME), |
61 | }; |
62 | |
63 | /* FIXME: is this needed? */ |
64 | static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc, |
65 | unsigned char *buf, |
66 | unsigned int buflen, int rw) |
67 | { |
68 | struct ata_device *dev = qc->dev; |
69 | struct ata_port *ap = dev->link->ap; |
70 | void __iomem *data_addr = ap->ioaddr.data_addr; |
71 | unsigned int words = buflen >> 1; |
72 | |
73 | /* Transfer multiple of 2 bytes */ |
74 | if (rw == READ) |
75 | raw_insw((u16 *)data_addr, (u16 *)buf, words); |
76 | else |
77 | raw_outsw((u16 *)data_addr, (u16 *)buf, words); |
78 | |
79 | /* Transfer trailing byte, if any. */ |
80 | if (unlikely(buflen & 0x01)) { |
81 | unsigned char pad[2] = { }; |
82 | |
83 | /* Point buf to the tail of buffer */ |
84 | buf += buflen - 1; |
85 | |
86 | if (rw == READ) { |
87 | raw_insw((u16 *)data_addr, (u16 *)pad, 1); |
88 | *buf = pad[0]; |
89 | } else { |
90 | pad[0] = *buf; |
91 | raw_outsw((u16 *)data_addr, (u16 *)pad, 1); |
92 | } |
93 | words++; |
94 | } |
95 | |
96 | return words << 1; |
97 | } |
98 | |
99 | /* |
100 | * Provide our own set_mode() as we don't want to change anything that has |
101 | * already been configured.. |
102 | */ |
103 | static int pata_buddha_set_mode(struct ata_link *link, |
104 | struct ata_device **unused) |
105 | { |
106 | struct ata_device *dev; |
107 | |
108 | ata_for_each_dev(dev, link, ENABLED) { |
109 | /* We don't really care */ |
110 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; |
111 | dev->xfer_shift = ATA_SHIFT_PIO; |
112 | dev->flags |= ATA_DFLAG_PIO; |
113 | ata_dev_info(dev, "configured for PIO\n" ); |
114 | } |
115 | return 0; |
116 | } |
117 | |
118 | static bool pata_buddha_irq_check(struct ata_port *ap) |
119 | { |
120 | u8 ch; |
121 | |
122 | ch = z_readb((unsigned long)ap->private_data); |
123 | |
124 | return !!(ch & 0x80); |
125 | } |
126 | |
127 | static void pata_xsurf_irq_clear(struct ata_port *ap) |
128 | { |
129 | z_writeb(0, (unsigned long)ap->private_data); |
130 | } |
131 | |
132 | static struct ata_port_operations pata_buddha_ops = { |
133 | .inherits = &ata_sff_port_ops, |
134 | .sff_data_xfer = pata_buddha_data_xfer, |
135 | .sff_irq_check = pata_buddha_irq_check, |
136 | .cable_detect = ata_cable_unknown, |
137 | .set_mode = pata_buddha_set_mode, |
138 | }; |
139 | |
140 | static struct ata_port_operations pata_xsurf_ops = { |
141 | .inherits = &ata_sff_port_ops, |
142 | .sff_data_xfer = pata_buddha_data_xfer, |
143 | .sff_irq_check = pata_buddha_irq_check, |
144 | .sff_irq_clear = pata_xsurf_irq_clear, |
145 | .cable_detect = ata_cable_unknown, |
146 | .set_mode = pata_buddha_set_mode, |
147 | }; |
148 | |
149 | static int pata_buddha_probe(struct zorro_dev *z, |
150 | const struct zorro_device_id *ent) |
151 | { |
152 | static const char * const board_name[] = { |
153 | "Buddha" , "Catweasel" , "X-Surf" |
154 | }; |
155 | struct ata_host *host; |
156 | void __iomem *buddha_board; |
157 | unsigned long board; |
158 | unsigned int type = ent->driver_data; |
159 | unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2; |
160 | void *old_drvdata; |
161 | int i; |
162 | |
163 | dev_info(&z->dev, "%s IDE controller\n" , board_name[type]); |
164 | |
165 | board = z->resource.start; |
166 | |
167 | if (type != BOARD_XSURF) { |
168 | if (!devm_request_mem_region(&z->dev, |
169 | board + BUDDHA_BASE1, |
170 | 0x800, DRV_NAME)) |
171 | return -ENXIO; |
172 | } else { |
173 | if (!devm_request_mem_region(&z->dev, |
174 | board + XSURF_BASE1, |
175 | 0x1000, DRV_NAME)) |
176 | return -ENXIO; |
177 | if (!devm_request_mem_region(&z->dev, |
178 | board + XSURF_BASE2, |
179 | 0x1000, DRV_NAME)) { |
180 | } |
181 | } |
182 | |
183 | /* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */ |
184 | if (type == BOARD_XSURF) |
185 | old_drvdata = dev_get_drvdata(dev: &z->dev); |
186 | |
187 | /* allocate host */ |
188 | host = ata_host_alloc(dev: &z->dev, max_ports: nr_ports); |
189 | if (type == BOARD_XSURF) |
190 | dev_set_drvdata(dev: &z->dev, data: old_drvdata); |
191 | if (!host) |
192 | return -ENXIO; |
193 | |
194 | buddha_board = ZTWO_VADDR(board); |
195 | |
196 | /* enable the board IRQ on Buddha/Catweasel */ |
197 | if (type != BOARD_XSURF) |
198 | z_writeb(0, buddha_board + BUDDHA_IRQ_MR); |
199 | |
200 | for (i = 0; i < nr_ports; i++) { |
201 | struct ata_port *ap = host->ports[i]; |
202 | void __iomem *base, *irqport; |
203 | unsigned long ctl = 0; |
204 | |
205 | if (type != BOARD_XSURF) { |
206 | ap->ops = &pata_buddha_ops; |
207 | base = buddha_board + buddha_bases[i]; |
208 | ctl = BUDDHA_CONTROL; |
209 | irqport = buddha_board + BUDDHA_IRQ + i * 0x40; |
210 | } else { |
211 | ap->ops = &pata_xsurf_ops; |
212 | base = buddha_board + xsurf_bases[i]; |
213 | /* X-Surf has no CS1* (Control/AltStat) */ |
214 | irqport = buddha_board + XSURF_IRQ; |
215 | } |
216 | |
217 | ap->pio_mask = ATA_PIO4; |
218 | ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; |
219 | |
220 | ap->ioaddr.data_addr = base; |
221 | ap->ioaddr.error_addr = base + 2 + 1 * 4; |
222 | ap->ioaddr.feature_addr = base + 2 + 1 * 4; |
223 | ap->ioaddr.nsect_addr = base + 2 + 2 * 4; |
224 | ap->ioaddr.lbal_addr = base + 2 + 3 * 4; |
225 | ap->ioaddr.lbam_addr = base + 2 + 4 * 4; |
226 | ap->ioaddr.lbah_addr = base + 2 + 5 * 4; |
227 | ap->ioaddr.device_addr = base + 2 + 6 * 4; |
228 | ap->ioaddr.status_addr = base + 2 + 7 * 4; |
229 | ap->ioaddr.command_addr = base + 2 + 7 * 4; |
230 | |
231 | if (ctl) { |
232 | ap->ioaddr.altstatus_addr = base + ctl; |
233 | ap->ioaddr.ctl_addr = base + ctl; |
234 | } |
235 | |
236 | ap->private_data = (void *)irqport; |
237 | |
238 | ata_port_desc(ap, fmt: "cmd 0x%lx ctl 0x%lx" , board, |
239 | ctl ? board + buddha_bases[i] + ctl : 0); |
240 | } |
241 | |
242 | ata_host_activate(host, irq: IRQ_AMIGA_PORTS, irq_handler: ata_sff_interrupt, |
243 | IRQF_SHARED, sht: &pata_buddha_sht); |
244 | |
245 | return 0; |
246 | } |
247 | |
248 | static void pata_buddha_remove(struct zorro_dev *z) |
249 | { |
250 | struct ata_host *host = dev_get_drvdata(dev: &z->dev); |
251 | |
252 | ata_host_detach(host); |
253 | } |
254 | |
255 | static const struct zorro_device_id pata_buddha_zorro_tbl[] = { |
256 | { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA}, |
257 | { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL}, |
258 | { 0 } |
259 | }; |
260 | MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl); |
261 | |
262 | static struct zorro_driver pata_buddha_driver = { |
263 | .name = "pata_buddha" , |
264 | .id_table = pata_buddha_zorro_tbl, |
265 | .probe = pata_buddha_probe, |
266 | .remove = pata_buddha_remove, |
267 | }; |
268 | |
269 | /* |
270 | * We cannot have a modalias for X-Surf boards, as it competes with the |
271 | * zorro8390 network driver. As a stopgap measure until we have proper |
272 | * MFD support for this board, we manually attach to it late after Zorro |
273 | * has enumerated its boards. |
274 | */ |
275 | static int __init pata_buddha_late_init(void) |
276 | { |
277 | struct zorro_dev *z = NULL; |
278 | |
279 | /* Auto-bind to regular boards */ |
280 | zorro_register_driver(&pata_buddha_driver); |
281 | |
282 | /* Manually bind to all X-Surf boards */ |
283 | while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, from: z))) { |
284 | static struct zorro_device_id xsurf_ent = { |
285 | ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF |
286 | }; |
287 | |
288 | pata_buddha_probe(z, ent: &xsurf_ent); |
289 | } |
290 | |
291 | return 0; |
292 | } |
293 | late_initcall(pata_buddha_late_init); |
294 | |
295 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz" ); |
296 | MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA" ); |
297 | MODULE_LICENSE("GPL v2" ); |
298 | MODULE_VERSION(DRV_VERSION); |
299 | |