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1 | /* | |
2 | * pata_winbond.c - Winbond VLB ATA controllers | |
3 | * (C) 2006 Red Hat <alan@redhat.com> | |
4 | * | |
5 | * Support for the Winbond 83759A when operating in advanced mode. | |
6 | * Multichip mode is not currently supported. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/blkdev.h> | |
13 | #include <linux/delay.h> | |
14 | #include <scsi/scsi_host.h> | |
15 | #include <linux/libata.h> | |
16 | #include <linux/platform_device.h> | |
17 | ||
18 | #define DRV_NAME "pata_winbond" | |
19 | #define DRV_VERSION "0.0.3" | |
20 | ||
21 | #define NR_HOST 4 /* Two winbond controllers, two channels each */ | |
22 | ||
23 | struct winbond_data { | |
24 | unsigned long config; | |
25 | struct platform_device *platform_dev; | |
26 | }; | |
27 | ||
28 | static struct ata_host *winbond_host[NR_HOST]; | |
29 | static struct winbond_data winbond_data[NR_HOST]; | |
30 | static int nr_winbond_host; | |
31 | ||
32 | #ifdef MODULE | |
33 | static int probe_winbond = 1; | |
34 | #else | |
35 | static int probe_winbond; | |
36 | #endif | |
37 | ||
38 | static DEFINE_SPINLOCK(winbond_lock); | |
39 | ||
40 | static void winbond_writecfg(unsigned long port, u8 reg, u8 val) | |
41 | { | |
42 | unsigned long flags; | |
43 | spin_lock_irqsave(&winbond_lock, flags); | |
44 | outb(reg, port + 0x01); | |
45 | outb(val, port + 0x02); | |
46 | spin_unlock_irqrestore(&winbond_lock, flags); | |
47 | } | |
48 | ||
49 | static u8 winbond_readcfg(unsigned long port, u8 reg) | |
50 | { | |
51 | u8 val; | |
52 | ||
53 | unsigned long flags; | |
54 | spin_lock_irqsave(&winbond_lock, flags); | |
55 | outb(reg, port + 0x01); | |
56 | val = inb(port + 0x02); | |
57 | spin_unlock_irqrestore(&winbond_lock, flags); | |
58 | ||
59 | return val; | |
60 | } | |
61 | ||
62 | static void winbond_set_piomode(struct ata_port *ap, struct ata_device *adev) | |
63 | { | |
64 | struct ata_timing t; | |
65 | struct winbond_data *winbond = ap->host->private_data; | |
66 | int active, recovery; | |
67 | u8 reg; | |
68 | int timing = 0x88 + (ap->port_no * 4) + (adev->devno * 2); | |
69 | ||
70 | reg = winbond_readcfg(winbond->config, 0x81); | |
71 | ||
72 | /* Get the timing data in cycles */ | |
73 | if (reg & 0x40) /* Fast VLB bus, assume 50MHz */ | |
74 | ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000); | |
75 | else | |
76 | ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000); | |
77 | ||
78 | active = (FIT(t.active, 3, 17) - 1) & 0x0F; | |
79 | recovery = (FIT(t.recover, 1, 15) + 1) & 0x0F; | |
80 | timing = (active << 4) | recovery; | |
81 | winbond_writecfg(winbond->config, timing, reg); | |
82 | ||
83 | /* Load the setup timing */ | |
84 | ||
85 | reg = 0x35; | |
86 | if (adev->class != ATA_DEV_ATA) | |
87 | reg |= 0x08; /* FIFO off */ | |
88 | if (!ata_pio_need_iordy(adev)) | |
89 | reg |= 0x02; /* IORDY off */ | |
90 | reg |= (FIT(t.setup, 0, 3) << 6); | |
91 | winbond_writecfg(winbond->config, timing + 1, reg); | |
92 | } | |
93 | ||
94 | ||
95 | static unsigned int winbond_data_xfer(struct ata_device *dev, | |
96 | unsigned char *buf, unsigned int buflen, int rw) | |
97 | { | |
98 | struct ata_port *ap = dev->link->ap; | |
99 | int slop = buflen & 3; | |
100 | ||
101 | if (ata_id_has_dword_io(dev->id)) { | |
102 | if (rw == READ) | |
103 | ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2); | |
104 | else | |
105 | iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2); | |
106 | ||
107 | if (unlikely(slop)) { | |
108 | u32 pad; | |
109 | if (rw == READ) { | |
110 | pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr)); | |
111 | memcpy(buf + buflen - slop, &pad, slop); | |
112 | } else { | |
113 | memcpy(&pad, buf + buflen - slop, slop); | |
114 | iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr); | |
115 | } | |
116 | buflen += 4 - slop; | |
117 | } | |
118 | } else | |
119 | buflen = ata_data_xfer(dev, buf, buflen, rw); | |
120 | ||
121 | return buflen; | |
122 | } | |
123 | ||
124 | static struct scsi_host_template winbond_sht = { | |
125 | ATA_PIO_SHT(DRV_NAME), | |
126 | }; | |
127 | ||
128 | static struct ata_port_operations winbond_port_ops = { | |
129 | .inherits = &ata_sff_port_ops, | |
130 | .data_xfer = winbond_data_xfer, | |
131 | .cable_detect = ata_cable_40wire, | |
132 | .set_piomode = winbond_set_piomode, | |
133 | }; | |
134 | ||
135 | /** | |
136 | * winbond_init_one - attach a winbond interface | |
137 | * @type: Type to display | |
138 | * @io: I/O port start | |
139 | * @irq: interrupt line | |
140 | * @fast: True if on a > 33Mhz VLB | |
141 | * | |
142 | * Register a VLB bus IDE interface. Such interfaces are PIO and we | |
143 | * assume do not support IRQ sharing. | |
144 | */ | |
145 | ||
146 | static __init int winbond_init_one(unsigned long port) | |
147 | { | |
148 | struct platform_device *pdev; | |
149 | u8 reg; | |
150 | int i, rc; | |
151 | ||
152 | reg = winbond_readcfg(port, 0x81); | |
153 | reg |= 0x80; /* jumpered mode off */ | |
154 | winbond_writecfg(port, 0x81, reg); | |
155 | reg = winbond_readcfg(port, 0x83); | |
156 | reg |= 0xF0; /* local control */ | |
157 | winbond_writecfg(port, 0x83, reg); | |
158 | reg = winbond_readcfg(port, 0x85); | |
159 | reg |= 0xF0; /* programmable timing */ | |
160 | winbond_writecfg(port, 0x85, reg); | |
161 | ||
162 | reg = winbond_readcfg(port, 0x81); | |
163 | ||
164 | if (!(reg & 0x03)) /* Disabled */ | |
165 | return -ENODEV; | |
166 | ||
167 | for (i = 0; i < 2 ; i ++) { | |
168 | unsigned long cmd_port = 0x1F0 - (0x80 * i); | |
169 | unsigned long ctl_port = cmd_port + 0x206; | |
170 | struct ata_host *host; | |
171 | struct ata_port *ap; | |
172 | void __iomem *cmd_addr, *ctl_addr; | |
173 | ||
174 | if (!(reg & (1 << i))) | |
175 | continue; | |
176 | ||
177 | pdev = platform_device_register_simple(DRV_NAME, nr_winbond_host, NULL, 0); | |
178 | if (IS_ERR(pdev)) | |
179 | return PTR_ERR(pdev); | |
180 | ||
181 | rc = -ENOMEM; | |
182 | host = ata_host_alloc(&pdev->dev, 1); | |
183 | if (!host) | |
184 | goto err_unregister; | |
185 | ap = host->ports[0]; | |
186 | ||
187 | rc = -ENOMEM; | |
188 | cmd_addr = devm_ioport_map(&pdev->dev, cmd_port, 8); | |
189 | ctl_addr = devm_ioport_map(&pdev->dev, ctl_port, 1); | |
190 | if (!cmd_addr || !ctl_addr) | |
191 | goto err_unregister; | |
192 | ||
193 | ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", cmd_port, ctl_port); | |
194 | ||
195 | ap->ops = &winbond_port_ops; | |
196 | ap->pio_mask = 0x1F; | |
197 | ap->flags |= ATA_FLAG_SLAVE_POSS; | |
198 | ap->ioaddr.cmd_addr = cmd_addr; | |
199 | ap->ioaddr.altstatus_addr = ctl_addr; | |
200 | ap->ioaddr.ctl_addr = ctl_addr; | |
201 | ata_std_ports(&ap->ioaddr); | |
202 | ||
203 | /* hook in a private data structure per channel */ | |
204 | host->private_data = &winbond_data[nr_winbond_host]; | |
205 | winbond_data[nr_winbond_host].config = port; | |
206 | winbond_data[nr_winbond_host].platform_dev = pdev; | |
207 | ||
208 | /* activate */ | |
209 | rc = ata_host_activate(host, 14 + i, ata_interrupt, 0, | |
210 | &winbond_sht); | |
211 | if (rc) | |
212 | goto err_unregister; | |
213 | ||
214 | winbond_host[nr_winbond_host++] = dev_get_drvdata(&pdev->dev); | |
215 | } | |
216 | ||
217 | return 0; | |
218 | ||
219 | err_unregister: | |
220 | platform_device_unregister(pdev); | |
221 | return rc; | |
222 | } | |
223 | ||
224 | /** | |
225 | * winbond_init - attach winbond interfaces | |
226 | * | |
227 | * Attach winbond IDE interfaces by scanning the ports it may occupy. | |
228 | */ | |
229 | ||
230 | static __init int winbond_init(void) | |
231 | { | |
232 | static const unsigned long config[2] = { 0x130, 0x1B0 }; | |
233 | ||
234 | int ct = 0; | |
235 | int i; | |
236 | ||
237 | if (probe_winbond == 0) | |
238 | return -ENODEV; | |
239 | ||
240 | /* | |
241 | * Check both base addresses | |
242 | */ | |
243 | ||
244 | for (i = 0; i < 2; i++) { | |
245 | if (probe_winbond & (1<<i)) { | |
246 | int ret = 0; | |
247 | unsigned long port = config[i]; | |
248 | ||
249 | if (request_region(port, 2, "pata_winbond")) { | |
250 | ret = winbond_init_one(port); | |
251 | if (ret <= 0) | |
252 | release_region(port, 2); | |
253 | else ct+= ret; | |
254 | } | |
255 | } | |
256 | } | |
257 | if (ct != 0) | |
258 | return 0; | |
259 | return -ENODEV; | |
260 | } | |
261 | ||
262 | static __exit void winbond_exit(void) | |
263 | { | |
264 | int i; | |
265 | ||
266 | for (i = 0; i < nr_winbond_host; i++) { | |
267 | ata_host_detach(winbond_host[i]); | |
268 | release_region(winbond_data[i].config, 2); | |
269 | platform_device_unregister(winbond_data[i].platform_dev); | |
270 | } | |
271 | } | |
272 | ||
273 | MODULE_AUTHOR("Alan Cox"); | |
274 | MODULE_DESCRIPTION("low-level driver for Winbond VL ATA"); | |
275 | MODULE_LICENSE("GPL"); | |
276 | MODULE_VERSION(DRV_VERSION); | |
277 | ||
278 | module_init(winbond_init); | |
279 | module_exit(winbond_exit); | |
280 | ||
281 | module_param(probe_winbond, int, 0); | |
282 |