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26#include <linux/compiler.h>
27#include <linux/errno.h>
28#include <linux/fb.h>
29#include <linux/init.h>
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/tc.h>
33#include <linux/types.h>
34
35#include <asm/io.h>
36
37#include <video/pmag-ba-fb.h>
38
39
40struct pmagbafb_par {
41 volatile void __iomem *mmio;
42 volatile u32 __iomem *dac;
43};
44
45
46static const struct fb_var_screeninfo pmagbafb_defined = {
47 .xres = 1024,
48 .yres = 864,
49 .xres_virtual = 1024,
50 .yres_virtual = 864,
51 .bits_per_pixel = 8,
52 .red.length = 8,
53 .green.length = 8,
54 .blue.length = 8,
55 .activate = FB_ACTIVATE_NOW,
56 .height = -1,
57 .width = -1,
58 .accel_flags = FB_ACCEL_NONE,
59 .pixclock = 14452,
60 .left_margin = 116,
61 .right_margin = 12,
62 .upper_margin = 34,
63 .lower_margin = 0,
64 .hsync_len = 128,
65 .vsync_len = 3,
66 .sync = FB_SYNC_ON_GREEN,
67 .vmode = FB_VMODE_NONINTERLACED,
68};
69
70static const struct fb_fix_screeninfo pmagbafb_fix = {
71 .id = "PMAG-BA",
72 .smem_len = (1024 * 1024),
73 .type = FB_TYPE_PACKED_PIXELS,
74 .visual = FB_VISUAL_PSEUDOCOLOR,
75 .line_length = 1024,
76 .mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
77};
78
79
80static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
81{
82 writeb(v, par->dac + reg / 4);
83}
84
85static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
86{
87 return readb(par->dac + reg / 4);
88}
89
90
91
92
93
94static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
95 unsigned int green, unsigned int blue,
96 unsigned int transp, struct fb_info *info)
97{
98 struct pmagbafb_par *par = info->par;
99
100 if (regno >= info->cmap.len)
101 return 1;
102
103 red >>= 8;
104 green >>= 8;
105 blue >>= 8;
106
107 mb();
108 dac_write(par, BT459_ADDR_LO, regno);
109 dac_write(par, BT459_ADDR_HI, 0x00);
110 wmb();
111 dac_write(par, BT459_CMAP, red);
112 wmb();
113 dac_write(par, BT459_CMAP, green);
114 wmb();
115 dac_write(par, BT459_CMAP, blue);
116
117 return 0;
118}
119
120static const struct fb_ops pmagbafb_ops = {
121 .owner = THIS_MODULE,
122 .fb_setcolreg = pmagbafb_setcolreg,
123 .fb_fillrect = cfb_fillrect,
124 .fb_copyarea = cfb_copyarea,
125 .fb_imageblit = cfb_imageblit,
126};
127
128
129
130
131
132static void pmagbafb_erase_cursor(struct fb_info *info)
133{
134 struct pmagbafb_par *par = info->par;
135
136 mb();
137 dac_write(par, BT459_ADDR_LO, 0x00);
138 dac_write(par, BT459_ADDR_HI, 0x03);
139 wmb();
140 dac_write(par, BT459_DATA, 0x00);
141}
142
143
144static int pmagbafb_probe(struct device *dev)
145{
146 struct tc_dev *tdev = to_tc_dev(dev);
147 resource_size_t start, len;
148 struct fb_info *info;
149 struct pmagbafb_par *par;
150 int err;
151
152 info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
153 if (!info)
154 return -ENOMEM;
155
156 par = info->par;
157 dev_set_drvdata(dev, info);
158
159 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
160 printk(KERN_ERR "%s: Cannot allocate color map\n",
161 dev_name(dev));
162 err = -ENOMEM;
163 goto err_alloc;
164 }
165
166 info->fbops = &pmagbafb_ops;
167 info->fix = pmagbafb_fix;
168 info->var = pmagbafb_defined;
169 info->flags = FBINFO_DEFAULT;
170
171
172 start = tdev->resource.start;
173 len = tdev->resource.end - start + 1;
174 if (!request_mem_region(start, len, dev_name(dev))) {
175 printk(KERN_ERR "%s: Cannot reserve FB region\n",
176 dev_name(dev));
177 err = -EBUSY;
178 goto err_cmap;
179 }
180
181
182 info->fix.mmio_start = start;
183 par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
184 if (!par->mmio) {
185 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
186 err = -ENOMEM;
187 goto err_resource;
188 }
189 par->dac = par->mmio + PMAG_BA_BT459;
190
191
192 info->fix.smem_start = start + PMAG_BA_FBMEM;
193 info->screen_base = ioremap(info->fix.smem_start,
194 info->fix.smem_len);
195 if (!info->screen_base) {
196 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
197 err = -ENOMEM;
198 goto err_mmio_map;
199 }
200 info->screen_size = info->fix.smem_len;
201
202 pmagbafb_erase_cursor(info);
203
204 err = register_framebuffer(info);
205 if (err < 0) {
206 printk(KERN_ERR "%s: Cannot register framebuffer\n",
207 dev_name(dev));
208 goto err_smem_map;
209 }
210
211 get_device(dev);
212
213 fb_info(info, "%s frame buffer device at %s\n",
214 info->fix.id, dev_name(dev));
215
216 return 0;
217
218
219err_smem_map:
220 iounmap(info->screen_base);
221
222err_mmio_map:
223 iounmap(par->mmio);
224
225err_resource:
226 release_mem_region(start, len);
227
228err_cmap:
229 fb_dealloc_cmap(&info->cmap);
230
231err_alloc:
232 framebuffer_release(info);
233 return err;
234}
235
236static int pmagbafb_remove(struct device *dev)
237{
238 struct tc_dev *tdev = to_tc_dev(dev);
239 struct fb_info *info = dev_get_drvdata(dev);
240 struct pmagbafb_par *par = info->par;
241 resource_size_t start, len;
242
243 put_device(dev);
244 unregister_framebuffer(info);
245 iounmap(info->screen_base);
246 iounmap(par->mmio);
247 start = tdev->resource.start;
248 len = tdev->resource.end - start + 1;
249 release_mem_region(start, len);
250 fb_dealloc_cmap(&info->cmap);
251 framebuffer_release(info);
252 return 0;
253}
254
255
256
257
258
259static const struct tc_device_id pmagbafb_tc_table[] = {
260 { "DEC ", "PMAG-BA " },
261 { }
262};
263MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
264
265static struct tc_driver pmagbafb_driver = {
266 .id_table = pmagbafb_tc_table,
267 .driver = {
268 .name = "pmagbafb",
269 .bus = &tc_bus_type,
270 .probe = pmagbafb_probe,
271 .remove = pmagbafb_remove,
272 },
273};
274
275static int __init pmagbafb_init(void)
276{
277#ifndef MODULE
278 if (fb_get_options("pmagbafb", NULL))
279 return -ENXIO;
280#endif
281 return tc_register_driver(&pmagbafb_driver);
282}
283
284static void __exit pmagbafb_exit(void)
285{
286 tc_unregister_driver(&pmagbafb_driver);
287}
288
289
290module_init(pmagbafb_init);
291module_exit(pmagbafb_exit);
292
293MODULE_LICENSE("GPL");
294
