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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/module.h> | |
22 | #include <linux/zorro.h> | |
23 | #include <scsi/scsi_cmnd.h> | |
24 | #include <scsi/scsi_host.h> | |
25 | ||
26 | #include <asm/amigahw.h> | |
27 | #include <asm/amigaints.h> | |
28 | #include <asm/ide.h> | |
29 | #include <asm/setup.h> | |
30 | ||
31 | #define DRV_NAME "pata_buddha" | |
32 | #define DRV_VERSION "0.1.0" | |
33 | ||
34 | #define BUDDHA_BASE1 0x800 | |
35 | #define BUDDHA_BASE2 0xa00 | |
36 | #define BUDDHA_BASE3 0xc00 | |
37 | #define XSURF_BASE1 0xb000 /* 2.5" interface */ | |
38 | #define XSURF_BASE2 0xd000 /* 3.5" interface */ | |
39 | #define BUDDHA_CONTROL 0x11a | |
40 | #define BUDDHA_IRQ 0xf00 | |
41 | #define XSURF_IRQ 0x7e | |
42 | #define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */ | |
43 | ||
44 | enum { | |
45 | BOARD_BUDDHA = 0, | |
46 | BOARD_CATWEASEL, | |
47 | BOARD_XSURF | |
48 | }; | |
49 | ||
50 | static unsigned int buddha_bases[3] __initdata = { | |
51 | BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3 | |
52 | }; | |
53 | ||
54 | static unsigned int xsurf_bases[2] __initdata = { | |
55 | XSURF_BASE1, XSURF_BASE2 | |
56 | }; | |
57 | ||
58 | static struct scsi_host_template pata_buddha_sht = { | |
59 | ATA_PIO_SHT(DRV_NAME), | |
60 | }; | |
61 | ||
62 | /* FIXME: is this needed? */ | |
63 | static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc, | |
64 | unsigned char *buf, | |
65 | unsigned int buflen, int rw) | |
66 | { | |
67 | struct ata_device *dev = qc->dev; | |
68 | struct ata_port *ap = dev->link->ap; | |
69 | void __iomem *data_addr = ap->ioaddr.data_addr; | |
70 | unsigned int words = buflen >> 1; | |
71 | ||
72 | /* Transfer multiple of 2 bytes */ | |
73 | if (rw == READ) | |
74 | raw_insw((u16 *)data_addr, (u16 *)buf, words); | |
75 | else | |
76 | raw_outsw((u16 *)data_addr, (u16 *)buf, words); | |
77 | ||
78 | /* Transfer trailing byte, if any. */ | |
79 | if (unlikely(buflen & 0x01)) { | |
80 | unsigned char pad[2] = { }; | |
81 | ||
82 | /* Point buf to the tail of buffer */ | |
83 | buf += buflen - 1; | |
84 | ||
85 | if (rw == READ) { | |
86 | raw_insw((u16 *)data_addr, (u16 *)pad, 1); | |
87 | *buf = pad[0]; | |
88 | } else { | |
89 | pad[0] = *buf; | |
90 | raw_outsw((u16 *)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_buddha_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 bool pata_buddha_irq_check(struct ata_port *ap) | |
118 | { | |
119 | u8 ch; | |
120 | ||
121 | ch = z_readb((unsigned long)ap->private_data); | |
122 | ||
123 | return !!(ch & 0x80); | |
124 | } | |
125 | ||
126 | static void pata_xsurf_irq_clear(struct ata_port *ap) | |
127 | { | |
128 | z_writeb(0, (unsigned long)ap->private_data); | |
129 | } | |
130 | ||
131 | static struct ata_port_operations pata_buddha_ops = { | |
132 | .inherits = &ata_sff_port_ops, | |
133 | .sff_data_xfer = pata_buddha_data_xfer, | |
134 | .sff_irq_check = pata_buddha_irq_check, | |
135 | .cable_detect = ata_cable_unknown, | |
136 | .set_mode = pata_buddha_set_mode, | |
137 | }; | |
138 | ||
139 | static struct ata_port_operations pata_xsurf_ops = { | |
140 | .inherits = &ata_sff_port_ops, | |
141 | .sff_data_xfer = pata_buddha_data_xfer, | |
142 | .sff_irq_check = pata_buddha_irq_check, | |
143 | .sff_irq_clear = pata_xsurf_irq_clear, | |
144 | .cable_detect = ata_cable_unknown, | |
145 | .set_mode = pata_buddha_set_mode, | |
146 | }; | |
147 | ||
148 | static int __init pata_buddha_init_one(void) | |
149 | { | |
150 | struct zorro_dev *z = NULL; | |
151 | ||
152 | while ((z = zorro_find_device(ZORRO_WILDCARD, z))) { | |
153 | static const char *board_name[] | |
154 | = { "Buddha", "Catweasel", "X-Surf" }; | |
155 | struct ata_host *host; | |
156 | void __iomem *buddha_board; | |
157 | unsigned long board; | |
158 | unsigned int type, nr_ports = 2; | |
159 | int i; | |
160 | ||
161 | if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) { | |
162 | type = BOARD_BUDDHA; | |
163 | } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) { | |
164 | type = BOARD_CATWEASEL; | |
165 | nr_ports++; | |
166 | } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) { | |
167 | type = BOARD_XSURF; | |
168 | } else | |
169 | continue; | |
170 | ||
171 | dev_info(&z->dev, "%s IDE controller\n", board_name[type]); | |
172 | ||
173 | board = z->resource.start; | |
174 | ||
175 | if (type != BOARD_XSURF) { | |
176 | if (!devm_request_mem_region(&z->dev, | |
177 | board + BUDDHA_BASE1, | |
178 | 0x800, DRV_NAME)) | |
179 | continue; | |
180 | } else { | |
181 | if (!devm_request_mem_region(&z->dev, | |
182 | board + XSURF_BASE1, | |
183 | 0x1000, DRV_NAME)) | |
184 | continue; | |
185 | if (!devm_request_mem_region(&z->dev, | |
186 | board + XSURF_BASE2, | |
187 | 0x1000, DRV_NAME)) | |
188 | continue; | |
189 | } | |
190 | ||
191 | /* allocate host */ | |
192 | host = ata_host_alloc(&z->dev, nr_ports); | |
193 | if (!host) | |
194 | continue; | |
195 | ||
196 | buddha_board = ZTWO_VADDR(board); | |
197 | ||
198 | /* enable the board IRQ on Buddha/Catweasel */ | |
199 | if (type != BOARD_XSURF) | |
200 | z_writeb(0, buddha_board + BUDDHA_IRQ_MR); | |
201 | ||
202 | for (i = 0; i < nr_ports; i++) { | |
203 | struct ata_port *ap = host->ports[i]; | |
204 | void __iomem *base, *irqport; | |
205 | unsigned long ctl = 0; | |
206 | ||
207 | if (type != BOARD_XSURF) { | |
208 | ap->ops = &pata_buddha_ops; | |
209 | base = buddha_board + buddha_bases[i]; | |
210 | ctl = BUDDHA_CONTROL; | |
211 | irqport = buddha_board + BUDDHA_IRQ + i * 0x40; | |
212 | } else { | |
213 | ap->ops = &pata_xsurf_ops; | |
214 | base = buddha_board + xsurf_bases[i]; | |
215 | /* X-Surf has no CS1* (Control/AltStat) */ | |
216 | irqport = buddha_board + XSURF_IRQ; | |
217 | } | |
218 | ||
219 | ap->pio_mask = ATA_PIO4; | |
220 | ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; | |
221 | ||
222 | ap->ioaddr.data_addr = base; | |
223 | ap->ioaddr.error_addr = base + 2 + 1 * 4; | |
224 | ap->ioaddr.feature_addr = base + 2 + 1 * 4; | |
225 | ap->ioaddr.nsect_addr = base + 2 + 2 * 4; | |
226 | ap->ioaddr.lbal_addr = base + 2 + 3 * 4; | |
227 | ap->ioaddr.lbam_addr = base + 2 + 4 * 4; | |
228 | ap->ioaddr.lbah_addr = base + 2 + 5 * 4; | |
229 | ap->ioaddr.device_addr = base + 2 + 6 * 4; | |
230 | ap->ioaddr.status_addr = base + 2 + 7 * 4; | |
231 | ap->ioaddr.command_addr = base + 2 + 7 * 4; | |
232 | ||
233 | if (ctl) { | |
234 | ap->ioaddr.altstatus_addr = base + ctl; | |
235 | ap->ioaddr.ctl_addr = base + ctl; | |
236 | } | |
237 | ||
238 | ap->private_data = (void *)irqport; | |
239 | ||
240 | ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", board, | |
241 | ctl ? board + buddha_bases[i] + ctl : 0); | |
242 | } | |
243 | ||
244 | ata_host_activate(host, IRQ_AMIGA_PORTS, ata_sff_interrupt, | |
245 | IRQF_SHARED, &pata_buddha_sht); | |
246 | ||
247 | } | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | module_init(pata_buddha_init_one); | |
253 | ||
254 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz"); | |
255 | MODULE_DESCRIPTION("low-level driver for Buddha/Catweasel/X-Surf PATA"); | |
256 | MODULE_LICENSE("GPL v2"); | |
257 | MODULE_VERSION(DRV_VERSION); |