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740c68a0 BZ |
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> | |
12ce6b0d | 21 | #include <linux/mod_devicetable.h> |
740c68a0 | 22 | #include <linux/module.h> |
12ce6b0d | 23 | #include <linux/types.h> |
740c68a0 BZ |
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/ide.h> | |
31 | #include <asm/setup.h> | |
32 | ||
33 | #define DRV_NAME "pata_buddha" | |
12ce6b0d | 34 | #define DRV_VERSION "0.1.1" |
740c68a0 BZ |
35 | |
36 | #define BUDDHA_BASE1 0x800 | |
37 | #define BUDDHA_BASE2 0xa00 | |
38 | #define BUDDHA_BASE3 0xc00 | |
39 | #define XSURF_BASE1 0xb000 /* 2.5" interface */ | |
40 | #define XSURF_BASE2 0xd000 /* 3.5" interface */ | |
41 | #define BUDDHA_CONTROL 0x11a | |
42 | #define BUDDHA_IRQ 0xf00 | |
43 | #define XSURF_IRQ 0x7e | |
44 | #define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */ | |
45 | ||
46 | enum { | |
47 | BOARD_BUDDHA = 0, | |
48 | BOARD_CATWEASEL, | |
49 | BOARD_XSURF | |
50 | }; | |
51 | ||
12ce6b0d | 52 | static unsigned int buddha_bases[3] = { |
740c68a0 BZ |
53 | BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3 |
54 | }; | |
55 | ||
12ce6b0d | 56 | static unsigned int xsurf_bases[2] = { |
740c68a0 BZ |
57 | XSURF_BASE1, XSURF_BASE2 |
58 | }; | |
59 | ||
60 | static struct scsi_host_template pata_buddha_sht = { | |
61 | ATA_PIO_SHT(DRV_NAME), | |
62 | }; | |
63 | ||
64 | /* FIXME: is this needed? */ | |
65 | static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc, | |
66 | unsigned char *buf, | |
67 | unsigned int buflen, int rw) | |
68 | { | |
69 | struct ata_device *dev = qc->dev; | |
70 | struct ata_port *ap = dev->link->ap; | |
71 | void __iomem *data_addr = ap->ioaddr.data_addr; | |
72 | unsigned int words = buflen >> 1; | |
73 | ||
74 | /* Transfer multiple of 2 bytes */ | |
75 | if (rw == READ) | |
76 | raw_insw((u16 *)data_addr, (u16 *)buf, words); | |
77 | else | |
78 | raw_outsw((u16 *)data_addr, (u16 *)buf, words); | |
79 | ||
80 | /* Transfer trailing byte, if any. */ | |
81 | if (unlikely(buflen & 0x01)) { | |
82 | unsigned char pad[2] = { }; | |
83 | ||
84 | /* Point buf to the tail of buffer */ | |
85 | buf += buflen - 1; | |
86 | ||
87 | if (rw == READ) { | |
88 | raw_insw((u16 *)data_addr, (u16 *)pad, 1); | |
89 | *buf = pad[0]; | |
90 | } else { | |
91 | pad[0] = *buf; | |
92 | raw_outsw((u16 *)data_addr, (u16 *)pad, 1); | |
93 | } | |
94 | words++; | |
95 | } | |
96 | ||
97 | return words << 1; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Provide our own set_mode() as we don't want to change anything that has | |
102 | * already been configured.. | |
103 | */ | |
104 | static int pata_buddha_set_mode(struct ata_link *link, | |
105 | struct ata_device **unused) | |
106 | { | |
107 | struct ata_device *dev; | |
108 | ||
109 | ata_for_each_dev(dev, link, ENABLED) { | |
110 | /* We don't really care */ | |
111 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; | |
112 | dev->xfer_shift = ATA_SHIFT_PIO; | |
113 | dev->flags |= ATA_DFLAG_PIO; | |
114 | ata_dev_info(dev, "configured for PIO\n"); | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static bool pata_buddha_irq_check(struct ata_port *ap) | |
120 | { | |
121 | u8 ch; | |
122 | ||
123 | ch = z_readb((unsigned long)ap->private_data); | |
124 | ||
125 | return !!(ch & 0x80); | |
126 | } | |
127 | ||
128 | static void pata_xsurf_irq_clear(struct ata_port *ap) | |
129 | { | |
130 | z_writeb(0, (unsigned long)ap->private_data); | |
131 | } | |
132 | ||
133 | static struct ata_port_operations pata_buddha_ops = { | |
134 | .inherits = &ata_sff_port_ops, | |
135 | .sff_data_xfer = pata_buddha_data_xfer, | |
136 | .sff_irq_check = pata_buddha_irq_check, | |
137 | .cable_detect = ata_cable_unknown, | |
138 | .set_mode = pata_buddha_set_mode, | |
139 | }; | |
140 | ||
141 | static struct ata_port_operations pata_xsurf_ops = { | |
142 | .inherits = &ata_sff_port_ops, | |
143 | .sff_data_xfer = pata_buddha_data_xfer, | |
144 | .sff_irq_check = pata_buddha_irq_check, | |
145 | .sff_irq_clear = pata_xsurf_irq_clear, | |
146 | .cable_detect = ata_cable_unknown, | |
147 | .set_mode = pata_buddha_set_mode, | |
148 | }; | |
149 | ||
12ce6b0d MS |
150 | static int pata_buddha_probe(struct zorro_dev *z, |
151 | const struct zorro_device_id *ent) | |
740c68a0 | 152 | { |
12ce6b0d MS |
153 | static const char * const board_name[] = { |
154 | "Buddha", "Catweasel", "X-Surf" | |
155 | }; | |
156 | struct ata_host *host; | |
157 | void __iomem *buddha_board; | |
158 | unsigned long board; | |
159 | unsigned int type = ent->driver_data; | |
160 | unsigned int nr_ports = (type == BOARD_CATWEASEL) ? 3 : 2; | |
161 | void *old_drvdata; | |
162 | int i; | |
163 | ||
164 | dev_info(&z->dev, "%s IDE controller\n", board_name[type]); | |
165 | ||
166 | board = z->resource.start; | |
167 | ||
168 | if (type != BOARD_XSURF) { | |
169 | if (!devm_request_mem_region(&z->dev, | |
170 | board + BUDDHA_BASE1, | |
171 | 0x800, DRV_NAME)) | |
172 | return -ENXIO; | |
173 | } else { | |
174 | if (!devm_request_mem_region(&z->dev, | |
175 | board + XSURF_BASE1, | |
176 | 0x1000, DRV_NAME)) | |
177 | return -ENXIO; | |
178 | if (!devm_request_mem_region(&z->dev, | |
179 | board + XSURF_BASE2, | |
180 | 0x1000, DRV_NAME)) { | |
181 | } | |
182 | } | |
183 | ||
184 | /* Workaround for X-Surf: Save drvdata in case zorro8390 has set it */ | |
185 | if (type == BOARD_XSURF) | |
186 | old_drvdata = dev_get_drvdata(&z->dev); | |
187 | ||
188 | /* allocate host */ | |
189 | host = ata_host_alloc(&z->dev, nr_ports); | |
190 | if (type == BOARD_XSURF) | |
191 | dev_set_drvdata(&z->dev, old_drvdata); | |
192 | if (!host) | |
193 | return -ENXIO; | |
194 | ||
195 | buddha_board = ZTWO_VADDR(board); | |
196 | ||
197 | /* enable the board IRQ on Buddha/Catweasel */ | |
198 | if (type != BOARD_XSURF) | |
199 | z_writeb(0, buddha_board + BUDDHA_IRQ_MR); | |
740c68a0 | 200 | |
12ce6b0d MS |
201 | for (i = 0; i < nr_ports; i++) { |
202 | struct ata_port *ap = host->ports[i]; | |
203 | void __iomem *base, *irqport; | |
204 | unsigned long ctl = 0; | |
740c68a0 BZ |
205 | |
206 | if (type != BOARD_XSURF) { | |
12ce6b0d MS |
207 | ap->ops = &pata_buddha_ops; |
208 | base = buddha_board + buddha_bases[i]; | |
209 | ctl = BUDDHA_CONTROL; | |
210 | irqport = buddha_board + BUDDHA_IRQ + i * 0x40; | |
740c68a0 | 211 | } else { |
12ce6b0d MS |
212 | ap->ops = &pata_xsurf_ops; |
213 | base = buddha_board + xsurf_bases[i]; | |
214 | /* X-Surf has no CS1* (Control/AltStat) */ | |
215 | irqport = buddha_board + XSURF_IRQ; | |
740c68a0 BZ |
216 | } |
217 | ||
12ce6b0d MS |
218 | ap->pio_mask = ATA_PIO4; |
219 | ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; | |
220 | ||
221 | ap->ioaddr.data_addr = base; | |
222 | ap->ioaddr.error_addr = base + 2 + 1 * 4; | |
223 | ap->ioaddr.feature_addr = base + 2 + 1 * 4; | |
224 | ap->ioaddr.nsect_addr = base + 2 + 2 * 4; | |
225 | ap->ioaddr.lbal_addr = base + 2 + 3 * 4; | |
226 | ap->ioaddr.lbam_addr = base + 2 + 4 * 4; | |
227 | ap->ioaddr.lbah_addr = base + 2 + 5 * 4; | |
228 | ap->ioaddr.device_addr = base + 2 + 6 * 4; | |
229 | ap->ioaddr.status_addr = base + 2 + 7 * 4; | |
230 | ap->ioaddr.command_addr = base + 2 + 7 * 4; | |
231 | ||
232 | if (ctl) { | |
233 | ap->ioaddr.altstatus_addr = base + ctl; | |
234 | ap->ioaddr.ctl_addr = base + ctl; | |
740c68a0 BZ |
235 | } |
236 | ||
12ce6b0d | 237 | ap->private_data = (void *)irqport; |
740c68a0 | 238 | |
12ce6b0d MS |
239 | ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board, |
240 | ctl ? board + buddha_bases[i] + ctl : 0); | |
740c68a0 BZ |
241 | } |
242 | ||
12ce6b0d MS |
243 | ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt, |
244 | IRQF_SHARED, &pata_buddha_sht); | |
245 | ||
740c68a0 BZ |
246 | return 0; |
247 | } | |
248 | ||
12ce6b0d MS |
249 | static void pata_buddha_remove(struct zorro_dev *z) |
250 | { | |
251 | struct ata_host *host = dev_get_drvdata(&z->dev); | |
252 | ||
253 | ata_host_detach(host); | |
254 | } | |
255 | ||
256 | static const struct zorro_device_id pata_buddha_zorro_tbl[] = { | |
257 | { ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA, BOARD_BUDDHA}, | |
258 | { ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL, BOARD_CATWEASEL}, | |
259 | { 0 } | |
260 | }; | |
261 | MODULE_DEVICE_TABLE(zorro, pata_buddha_zorro_tbl); | |
262 | ||
263 | static struct zorro_driver pata_buddha_driver = { | |
264 | .name = "pata_buddha", | |
265 | .id_table = pata_buddha_zorro_tbl, | |
266 | .probe = pata_buddha_probe, | |
267 | .remove = pata_buddha_remove, | |
268 | }; | |
269 | ||
270 | /* | |
271 | * We cannot have a modalias for X-Surf boards, as it competes with the | |
272 | * zorro8390 network driver. As a stopgap measure until we have proper | |
273 | * MFD support for this board, we manually attach to it late after Zorro | |
274 | * has enumerated its boards. | |
275 | */ | |
276 | static int __init pata_buddha_late_init(void) | |
277 | { | |
278 | struct zorro_dev *z = NULL; | |
279 | ||
280 | /* Auto-bind to regular boards */ | |
281 | zorro_register_driver(&pata_buddha_driver); | |
282 | ||
283 | /* Manually bind to all X-Surf boards */ | |
284 | while ((z = zorro_find_device(ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, z))) { | |
285 | static struct zorro_device_id xsurf_ent = { | |
286 | ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF, BOARD_XSURF | |
287 | }; | |
288 | ||
289 | pata_buddha_probe(z, &xsurf_ent); | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | late_initcall(pata_buddha_late_init); | |
740c68a0 BZ |
295 | |
296 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); | |
297 | MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA"); | |
298 | MODULE_LICENSE("GPL v2"); | |
299 | MODULE_VERSION(DRV_VERSION); |