1 | /* |
2 | * linux/drivers/video/pmag-ba-fb.c |
3 | * |
4 | * PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support, |
5 | * derived from: |
6 | * "HP300 Topcat framebuffer support (derived from macfb of all things) |
7 | * Phil Blundell <philb@gnu.org> 1998", the original code can be |
8 | * found in the file hpfb.c in the same directory. |
9 | * |
10 | * Based on digital document: |
11 | * "PMAG-BA TURBOchannel Color Frame Buffer |
12 | * Functional Specification", Revision 1.2, August 27, 1990 |
13 | * |
14 | * DECstation related code Copyright (C) 1999, 2000, 2001 by |
15 | * Michael Engel <engel@unix-ag.org>, |
16 | * Karsten Merker <merker@linuxtag.org> and |
17 | * Harald Koerfgen. |
18 | * Copyright (c) 2005, 2006 Maciej W. Rozycki |
19 | * Copyright (c) 2005 James Simmons |
20 | * |
21 | * This file is subject to the terms and conditions of the GNU General |
22 | * Public License. See the file COPYING in the main directory of this |
23 | * archive for more details. |
24 | */ |
25 | |
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 | |
40 | struct pmagbafb_par { |
41 | volatile void __iomem *mmio; |
42 | volatile u32 __iomem *dac; |
43 | }; |
44 | |
45 | |
46 | static 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 | |
70 | static 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 | |
80 | static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v) |
81 | { |
82 | writeb(val: v, addr: par->dac + reg / 4); |
83 | } |
84 | |
85 | static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg) |
86 | { |
87 | return readb(addr: par->dac + reg / 4); |
88 | } |
89 | |
90 | |
91 | /* |
92 | * Set the palette. |
93 | */ |
94 | static 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; /* The cmap fields are 16 bits */ |
104 | green >>= 8; /* wide, but the hardware colormap */ |
105 | blue >>= 8; /* registers are only 8 bits wide */ |
106 | |
107 | mb(); |
108 | dac_write(par, BT459_ADDR_LO, v: regno); |
109 | dac_write(par, BT459_ADDR_HI, v: 0x00); |
110 | wmb(); |
111 | dac_write(par, BT459_CMAP, v: red); |
112 | wmb(); |
113 | dac_write(par, BT459_CMAP, v: green); |
114 | wmb(); |
115 | dac_write(par, BT459_CMAP, v: blue); |
116 | |
117 | return 0; |
118 | } |
119 | |
120 | static const struct fb_ops pmagbafb_ops = { |
121 | .owner = THIS_MODULE, |
122 | FB_DEFAULT_IOMEM_OPS, |
123 | .fb_setcolreg = pmagbafb_setcolreg, |
124 | }; |
125 | |
126 | |
127 | /* |
128 | * Turn the hardware cursor off. |
129 | */ |
130 | static void pmagbafb_erase_cursor(struct fb_info *info) |
131 | { |
132 | struct pmagbafb_par *par = info->par; |
133 | |
134 | mb(); |
135 | dac_write(par, BT459_ADDR_LO, v: 0x00); |
136 | dac_write(par, BT459_ADDR_HI, v: 0x03); |
137 | wmb(); |
138 | dac_write(par, BT459_DATA, v: 0x00); |
139 | } |
140 | |
141 | |
142 | static int pmagbafb_probe(struct device *dev) |
143 | { |
144 | struct tc_dev *tdev = to_tc_dev(dev); |
145 | resource_size_t start, len; |
146 | struct fb_info *info; |
147 | struct pmagbafb_par *par; |
148 | int err; |
149 | |
150 | info = framebuffer_alloc(size: sizeof(struct pmagbafb_par), dev); |
151 | if (!info) |
152 | return -ENOMEM; |
153 | |
154 | par = info->par; |
155 | dev_set_drvdata(dev, data: info); |
156 | |
157 | if (fb_alloc_cmap(cmap: &info->cmap, len: 256, transp: 0) < 0) { |
158 | printk(KERN_ERR "%s: Cannot allocate color map\n" , |
159 | dev_name(dev)); |
160 | err = -ENOMEM; |
161 | goto err_alloc; |
162 | } |
163 | |
164 | info->fbops = &pmagbafb_ops; |
165 | info->fix = pmagbafb_fix; |
166 | info->var = pmagbafb_defined; |
167 | |
168 | /* Request the I/O MEM resource. */ |
169 | start = tdev->resource.start; |
170 | len = tdev->resource.end - start + 1; |
171 | if (!request_mem_region(start, len, dev_name(dev))) { |
172 | printk(KERN_ERR "%s: Cannot reserve FB region\n" , |
173 | dev_name(dev)); |
174 | err = -EBUSY; |
175 | goto err_cmap; |
176 | } |
177 | |
178 | /* MMIO mapping setup. */ |
179 | info->fix.mmio_start = start; |
180 | par->mmio = ioremap(offset: info->fix.mmio_start, size: info->fix.mmio_len); |
181 | if (!par->mmio) { |
182 | printk(KERN_ERR "%s: Cannot map MMIO\n" , dev_name(dev)); |
183 | err = -ENOMEM; |
184 | goto err_resource; |
185 | } |
186 | par->dac = par->mmio + PMAG_BA_BT459; |
187 | |
188 | /* Frame buffer mapping setup. */ |
189 | info->fix.smem_start = start + PMAG_BA_FBMEM; |
190 | info->screen_base = ioremap(offset: info->fix.smem_start, |
191 | size: info->fix.smem_len); |
192 | if (!info->screen_base) { |
193 | printk(KERN_ERR "%s: Cannot map FB\n" , dev_name(dev)); |
194 | err = -ENOMEM; |
195 | goto err_mmio_map; |
196 | } |
197 | info->screen_size = info->fix.smem_len; |
198 | |
199 | pmagbafb_erase_cursor(info); |
200 | |
201 | err = register_framebuffer(fb_info: info); |
202 | if (err < 0) { |
203 | printk(KERN_ERR "%s: Cannot register framebuffer\n" , |
204 | dev_name(dev)); |
205 | goto err_smem_map; |
206 | } |
207 | |
208 | get_device(dev); |
209 | |
210 | fb_info(info, "%s frame buffer device at %s\n" , |
211 | info->fix.id, dev_name(dev)); |
212 | |
213 | return 0; |
214 | |
215 | |
216 | err_smem_map: |
217 | iounmap(addr: info->screen_base); |
218 | |
219 | err_mmio_map: |
220 | iounmap(addr: par->mmio); |
221 | |
222 | err_resource: |
223 | release_mem_region(start, len); |
224 | |
225 | err_cmap: |
226 | fb_dealloc_cmap(cmap: &info->cmap); |
227 | |
228 | err_alloc: |
229 | framebuffer_release(info); |
230 | return err; |
231 | } |
232 | |
233 | static int pmagbafb_remove(struct device *dev) |
234 | { |
235 | struct tc_dev *tdev = to_tc_dev(dev); |
236 | struct fb_info *info = dev_get_drvdata(dev); |
237 | struct pmagbafb_par *par = info->par; |
238 | resource_size_t start, len; |
239 | |
240 | put_device(dev); |
241 | unregister_framebuffer(fb_info: info); |
242 | iounmap(addr: info->screen_base); |
243 | iounmap(addr: par->mmio); |
244 | start = tdev->resource.start; |
245 | len = tdev->resource.end - start + 1; |
246 | release_mem_region(start, len); |
247 | fb_dealloc_cmap(cmap: &info->cmap); |
248 | framebuffer_release(info); |
249 | return 0; |
250 | } |
251 | |
252 | |
253 | /* |
254 | * Initialize the framebuffer. |
255 | */ |
256 | static const struct tc_device_id pmagbafb_tc_table[] = { |
257 | { "DEC " , "PMAG-BA " }, |
258 | { } |
259 | }; |
260 | MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table); |
261 | |
262 | static struct tc_driver pmagbafb_driver = { |
263 | .id_table = pmagbafb_tc_table, |
264 | .driver = { |
265 | .name = "pmagbafb" , |
266 | .bus = &tc_bus_type, |
267 | .probe = pmagbafb_probe, |
268 | .remove = pmagbafb_remove, |
269 | }, |
270 | }; |
271 | |
272 | static int __init pmagbafb_init(void) |
273 | { |
274 | #ifndef MODULE |
275 | if (fb_get_options(name: "pmagbafb" , NULL)) |
276 | return -ENXIO; |
277 | #endif |
278 | return tc_register_driver(tdrv: &pmagbafb_driver); |
279 | } |
280 | |
281 | static void __exit pmagbafb_exit(void) |
282 | { |
283 | tc_unregister_driver(tdrv: &pmagbafb_driver); |
284 | } |
285 | |
286 | |
287 | module_init(pmagbafb_init); |
288 | module_exit(pmagbafb_exit); |
289 | |
290 | MODULE_LICENSE("GPL" ); |
291 | |