[SCSI] lpfc 8.2.5 : Update lpfc driver version to 8.2.5
[linux-2.6] / drivers / ssb / pcmcia.c
1 /*
2  * Sonics Silicon Backplane
3  * PCMCIA-Hostbus related functions
4  *
5  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6  * Copyright 2007 Michael Buesch <mb@bu3sch.de>
7  *
8  * Licensed under the GNU/GPL. See COPYING for details.
9  */
10
11 #include <linux/ssb/ssb.h>
12 #include <linux/delay.h>
13 #include <linux/io.h>
14
15 #include <pcmcia/cs_types.h>
16 #include <pcmcia/cs.h>
17 #include <pcmcia/cistpl.h>
18 #include <pcmcia/ciscode.h>
19 #include <pcmcia/ds.h>
20 #include <pcmcia/cisreg.h>
21
22 #include "ssb_private.h"
23
24
25 /* Define the following to 1 to enable a printk on each coreswitch. */
26 #define SSB_VERBOSE_PCMCIACORESWITCH_DEBUG              0
27
28
29 int ssb_pcmcia_switch_coreidx(struct ssb_bus *bus,
30                               u8 coreidx)
31 {
32         struct pcmcia_device *pdev = bus->host_pcmcia;
33         int err;
34         int attempts = 0;
35         u32 cur_core;
36         conf_reg_t reg;
37         u32 addr;
38         u32 read_addr;
39
40         addr = (coreidx * SSB_CORE_SIZE) + SSB_ENUM_BASE;
41         while (1) {
42                 reg.Action = CS_WRITE;
43                 reg.Offset = 0x2E;
44                 reg.Value = (addr & 0x0000F000) >> 12;
45                 err = pcmcia_access_configuration_register(pdev, &reg);
46                 if (err != CS_SUCCESS)
47                         goto error;
48                 reg.Offset = 0x30;
49                 reg.Value = (addr & 0x00FF0000) >> 16;
50                 err = pcmcia_access_configuration_register(pdev, &reg);
51                 if (err != CS_SUCCESS)
52                         goto error;
53                 reg.Offset = 0x32;
54                 reg.Value = (addr & 0xFF000000) >> 24;
55                 err = pcmcia_access_configuration_register(pdev, &reg);
56                 if (err != CS_SUCCESS)
57                         goto error;
58
59                 read_addr = 0;
60
61                 reg.Action = CS_READ;
62                 reg.Offset = 0x2E;
63                 err = pcmcia_access_configuration_register(pdev, &reg);
64                 if (err != CS_SUCCESS)
65                         goto error;
66                 read_addr |= ((u32)(reg.Value & 0x0F)) << 12;
67                 reg.Offset = 0x30;
68                 err = pcmcia_access_configuration_register(pdev, &reg);
69                 if (err != CS_SUCCESS)
70                         goto error;
71                 read_addr |= ((u32)reg.Value) << 16;
72                 reg.Offset = 0x32;
73                 err = pcmcia_access_configuration_register(pdev, &reg);
74                 if (err != CS_SUCCESS)
75                         goto error;
76                 read_addr |= ((u32)reg.Value) << 24;
77
78                 cur_core = (read_addr - SSB_ENUM_BASE) / SSB_CORE_SIZE;
79                 if (cur_core == coreidx)
80                         break;
81
82                 if (attempts++ > SSB_BAR0_MAX_RETRIES)
83                         goto error;
84                 udelay(10);
85         }
86
87         return 0;
88 error:
89         ssb_printk(KERN_ERR PFX "Failed to switch to core %u\n", coreidx);
90         return -ENODEV;
91 }
92
93 int ssb_pcmcia_switch_core(struct ssb_bus *bus,
94                            struct ssb_device *dev)
95 {
96         int err;
97
98 #if SSB_VERBOSE_PCMCIACORESWITCH_DEBUG
99         ssb_printk(KERN_INFO PFX
100                    "Switching to %s core, index %d\n",
101                    ssb_core_name(dev->id.coreid),
102                    dev->core_index);
103 #endif
104
105         err = ssb_pcmcia_switch_coreidx(bus, dev->core_index);
106         if (!err)
107                 bus->mapped_device = dev;
108
109         return err;
110 }
111
112 int ssb_pcmcia_switch_segment(struct ssb_bus *bus, u8 seg)
113 {
114         int attempts = 0;
115         conf_reg_t reg;
116         int res;
117
118         SSB_WARN_ON((seg != 0) && (seg != 1));
119         reg.Offset = 0x34;
120         reg.Function = 0;
121         while (1) {
122                 reg.Action = CS_WRITE;
123                 reg.Value = seg;
124                 res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
125                 if (unlikely(res != CS_SUCCESS))
126                         goto error;
127                 reg.Value = 0xFF;
128                 reg.Action = CS_READ;
129                 res = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
130                 if (unlikely(res != CS_SUCCESS))
131                         goto error;
132
133                 if (reg.Value == seg)
134                         break;
135
136                 if (unlikely(attempts++ > SSB_BAR0_MAX_RETRIES))
137                         goto error;
138                 udelay(10);
139         }
140         bus->mapped_pcmcia_seg = seg;
141
142         return 0;
143 error:
144         ssb_printk(KERN_ERR PFX "Failed to switch pcmcia segment\n");
145         return -ENODEV;
146 }
147
148 static int select_core_and_segment(struct ssb_device *dev,
149                                    u16 *offset)
150 {
151         struct ssb_bus *bus = dev->bus;
152         int err;
153         u8 need_segment;
154
155         if (*offset >= 0x800) {
156                 *offset -= 0x800;
157                 need_segment = 1;
158         } else
159                 need_segment = 0;
160
161         if (unlikely(dev != bus->mapped_device)) {
162                 err = ssb_pcmcia_switch_core(bus, dev);
163                 if (unlikely(err))
164                         return err;
165         }
166         if (unlikely(need_segment != bus->mapped_pcmcia_seg)) {
167                 err = ssb_pcmcia_switch_segment(bus, need_segment);
168                 if (unlikely(err))
169                         return err;
170         }
171
172         return 0;
173 }
174
175 static u16 ssb_pcmcia_read16(struct ssb_device *dev, u16 offset)
176 {
177         struct ssb_bus *bus = dev->bus;
178         unsigned long flags;
179         int err;
180         u16 value = 0xFFFF;
181
182         spin_lock_irqsave(&bus->bar_lock, flags);
183         err = select_core_and_segment(dev, &offset);
184         if (likely(!err))
185                 value = readw(bus->mmio + offset);
186         spin_unlock_irqrestore(&bus->bar_lock, flags);
187
188         return value;
189 }
190
191 static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
192 {
193         struct ssb_bus *bus = dev->bus;
194         unsigned long flags;
195         int err;
196         u32 lo = 0xFFFFFFFF, hi = 0xFFFFFFFF;
197
198         spin_lock_irqsave(&bus->bar_lock, flags);
199         err = select_core_and_segment(dev, &offset);
200         if (likely(!err)) {
201                 lo = readw(bus->mmio + offset);
202                 hi = readw(bus->mmio + offset + 2);
203         }
204         spin_unlock_irqrestore(&bus->bar_lock, flags);
205
206         return (lo | (hi << 16));
207 }
208
209 static void ssb_pcmcia_write16(struct ssb_device *dev, u16 offset, u16 value)
210 {
211         struct ssb_bus *bus = dev->bus;
212         unsigned long flags;
213         int err;
214
215         spin_lock_irqsave(&bus->bar_lock, flags);
216         err = select_core_and_segment(dev, &offset);
217         if (likely(!err))
218                 writew(value, bus->mmio + offset);
219         mmiowb();
220         spin_unlock_irqrestore(&bus->bar_lock, flags);
221 }
222
223 static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
224 {
225         struct ssb_bus *bus = dev->bus;
226         unsigned long flags;
227         int err;
228
229         spin_lock_irqsave(&bus->bar_lock, flags);
230         err = select_core_and_segment(dev, &offset);
231         if (likely(!err)) {
232                 writew((value & 0x0000FFFF), bus->mmio + offset);
233                 writew(((value & 0xFFFF0000) >> 16), bus->mmio + offset + 2);
234         }
235         mmiowb();
236         spin_unlock_irqrestore(&bus->bar_lock, flags);
237 }
238
239 /* Not "static", as it's used in main.c */
240 const struct ssb_bus_ops ssb_pcmcia_ops = {
241         .read16         = ssb_pcmcia_read16,
242         .read32         = ssb_pcmcia_read32,
243         .write16        = ssb_pcmcia_write16,
244         .write32        = ssb_pcmcia_write32,
245 };
246
247 #include <linux/etherdevice.h>
248 int ssb_pcmcia_get_invariants(struct ssb_bus *bus,
249                               struct ssb_init_invariants *iv)
250 {
251         //TODO
252         random_ether_addr(iv->sprom.il0mac);
253         return 0;
254 }
255
256 int ssb_pcmcia_init(struct ssb_bus *bus)
257 {
258         conf_reg_t reg;
259         int err;
260
261         if (bus->bustype != SSB_BUSTYPE_PCMCIA)
262                 return 0;
263
264         /* Switch segment to a known state and sync
265          * bus->mapped_pcmcia_seg with hardware state. */
266         ssb_pcmcia_switch_segment(bus, 0);
267
268         /* Init IRQ routing */
269         reg.Action = CS_READ;
270         reg.Function = 0;
271         if (bus->chip_id == 0x4306)
272                 reg.Offset = 0x00;
273         else
274                 reg.Offset = 0x80;
275         err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
276         if (err != CS_SUCCESS)
277                 goto error;
278         reg.Action = CS_WRITE;
279         reg.Value |= 0x04 | 0x01;
280         err = pcmcia_access_configuration_register(bus->host_pcmcia, &reg);
281         if (err != CS_SUCCESS)
282                 goto error;
283
284         return 0;
285 error:
286         return -ENODEV;
287 }