Root/target/linux/goldfish/patches-2.6.30/0128--ARM-goldfish-fb-Add-fb-driver-for-goldfish.patch

1From f8101c780fdc050eda9f93c94f8841de9f384b4f Mon Sep 17 00:00:00 2001
2From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@google.com>
3Date: Fri, 29 Jun 2007 22:14:27 -0700
4Subject: [PATCH 128/134] [ARM] goldfish: fb: Add fb driver for goldfish.
5MIME-Version: 1.0
6Content-Type: text/plain; charset=utf-8
7Content-Transfer-Encoding: 8bit
8
9Supports panning for double buffering.
10
11Signed-off-by: Mike A. Chan <mikechan@google.com>
12Signed-off-by: Arve Hjønnevåg <arve@android.com>
13---
14 drivers/video/Kconfig | 9 ++
15 drivers/video/Makefile | 1 +
16 drivers/video/goldfishfb.c | 334 ++++++++++++++++++++++++++++++++++++++++++++
17 3 files changed, 344 insertions(+), 0 deletions(-)
18 create mode 100644 drivers/video/goldfishfb.c
19
20--- a/drivers/video/Kconfig
21+++ b/drivers/video/Kconfig
22@@ -2005,6 +2005,15 @@ config FB_XILINX
23       framebuffer. ML300 carries a 640*480 LCD display on the board,
24       ML403 uses a standard DB15 VGA connector.
25 
26+config FB_GOLDFISH
27+ tristate "Goldfish Framebuffer"
28+ depends on FB
29+ select FB_CFB_FILLRECT
30+ select FB_CFB_COPYAREA
31+ select FB_CFB_IMAGEBLIT
32+ ---help---
33+ Framebuffer driver for Goldfish Virtual Platform
34+
35 config FB_COBALT
36     tristate "Cobalt server LCD frame buffer support"
37     depends on FB && MIPS_COBALT
38--- a/drivers/video/Makefile
39+++ b/drivers/video/Makefile
40@@ -92,6 +92,7 @@ obj-$(CONFIG_FB_ATMEL) += atmel_lcdfb
41 obj-$(CONFIG_FB_PVR2) += pvr2fb.o
42 obj-$(CONFIG_FB_VOODOO1) += sstfb.o
43 obj-$(CONFIG_FB_ARMCLCD) += amba-clcd.o
44+obj-$(CONFIG_FB_GOLDFISH) += goldfishfb.o
45 obj-$(CONFIG_FB_68328) += 68328fb.o
46 obj-$(CONFIG_FB_GBE) += gbefb.o
47 obj-$(CONFIG_FB_CIRRUS) += cirrusfb.o
48--- /dev/null
49+++ b/drivers/video/goldfishfb.c
50@@ -0,0 +1,334 @@
51+/* drivers/video/goldfishfb.c
52+**
53+** Copyright (C) 2007 Google, Inc.
54+**
55+** This software is licensed under the terms of the GNU General Public
56+** License version 2, as published by the Free Software Foundation, and
57+** may be copied, distributed, and modified under those terms.
58+**
59+** This program is distributed in the hope that it will be useful,
60+** but WITHOUT ANY WARRANTY; without even the implied warranty of
61+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
62+** GNU General Public License for more details.
63+**
64+*/
65+
66+#include <linux/module.h>
67+#include <linux/kernel.h>
68+#include <linux/dma-mapping.h>
69+#include <linux/errno.h>
70+#include <linux/string.h>
71+#include <linux/slab.h>
72+#include <linux/delay.h>
73+#include <linux/mm.h>
74+#include <linux/fb.h>
75+#include <linux/init.h>
76+#include <linux/interrupt.h>
77+#include <linux/ioport.h>
78+#include <linux/platform_device.h>
79+#ifdef CONFIG_ANDROID_POWER
80+#include <linux/android_power.h>
81+#endif
82+
83+#include <mach/hardware.h>
84+
85+enum {
86+ FB_GET_WIDTH = 0x00,
87+ FB_GET_HEIGHT = 0x04,
88+ FB_INT_STATUS = 0x08,
89+ FB_INT_ENABLE = 0x0c,
90+ FB_SET_BASE = 0x10,
91+ FB_SET_ROTATION = 0x14,
92+ FB_SET_BLANK = 0x18,
93+ FB_GET_PHYS_WIDTH = 0x1c,
94+ FB_GET_PHYS_HEIGHT = 0x20,
95+
96+ FB_INT_VSYNC = 1U << 0,
97+ FB_INT_BASE_UPDATE_DONE = 1U << 1
98+};
99+
100+struct goldfish_fb {
101+ uint32_t reg_base;
102+ int irq;
103+ spinlock_t lock;
104+ wait_queue_head_t wait;
105+ int base_update_count;
106+ int rotation;
107+ struct fb_info fb;
108+ u32 cmap[16];
109+#ifdef CONFIG_ANDROID_POWER
110+ android_early_suspend_t early_suspend;
111+#endif
112+};
113+
114+static irqreturn_t
115+goldfish_fb_interrupt(int irq, void *dev_id)
116+{
117+ unsigned long irq_flags;
118+ struct goldfish_fb *fb = dev_id;
119+ uint32_t status;
120+
121+ spin_lock_irqsave(&fb->lock, irq_flags);
122+ status = readl(fb->reg_base + FB_INT_STATUS);
123+ if(status & FB_INT_BASE_UPDATE_DONE) {
124+ fb->base_update_count++;
125+ wake_up(&fb->wait);
126+ }
127+ spin_unlock_irqrestore(&fb->lock, irq_flags);
128+ return status ? IRQ_HANDLED : IRQ_NONE;
129+}
130+
131+static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
132+{
133+ unsigned int mask = (1 << bf->length) - 1;
134+
135+ return (val >> (16 - bf->length) & mask) << bf->offset;
136+}
137+
138+static int
139+goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
140+ unsigned int blue, unsigned int transp, struct fb_info *info)
141+{
142+ struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
143+
144+ if (regno < 16) {
145+ fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
146+ convert_bitfield(blue, &fb->fb.var.blue) |
147+ convert_bitfield(green, &fb->fb.var.green) |
148+ convert_bitfield(red, &fb->fb.var.red);
149+ return 0;
150+ }
151+ else {
152+ return 1;
153+ }
154+}
155+
156+static int goldfish_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
157+{
158+ if((var->rotate & 1) != (info->var.rotate & 1)) {
159+ if((var->xres != info->var.yres) ||
160+ (var->yres != info->var.xres) ||
161+ (var->xres_virtual != info->var.yres) ||
162+ (var->yres_virtual > info->var.xres * 2) ||
163+ (var->yres_virtual < info->var.xres )) {
164+ return -EINVAL;
165+ }
166+ }
167+ else {
168+ if((var->xres != info->var.xres) ||
169+ (var->yres != info->var.yres) ||
170+ (var->xres_virtual != info->var.xres) ||
171+ (var->yres_virtual > info->var.yres * 2) ||
172+ (var->yres_virtual < info->var.yres )) {
173+ return -EINVAL;
174+ }
175+ }
176+ if((var->xoffset != info->var.xoffset) ||
177+ (var->bits_per_pixel != info->var.bits_per_pixel) ||
178+ (var->grayscale != info->var.grayscale)) {
179+ return -EINVAL;
180+ }
181+ return 0;
182+}
183+
184+static int goldfish_fb_set_par(struct fb_info *info)
185+{
186+ struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
187+ if(fb->rotation != fb->fb.var.rotate) {
188+ info->fix.line_length = info->var.xres * 2;
189+ fb->rotation = fb->fb.var.rotate;
190+ writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
191+ }
192+ return 0;
193+}
194+
195+
196+static int goldfish_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
197+{
198+ unsigned long irq_flags;
199+ int base_update_count;
200+ struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
201+
202+ spin_lock_irqsave(&fb->lock, irq_flags);
203+ base_update_count = fb->base_update_count;
204+ writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset, fb->reg_base + FB_SET_BASE);
205+ spin_unlock_irqrestore(&fb->lock, irq_flags);
206+ wait_event_timeout(fb->wait, fb->base_update_count != base_update_count, HZ / 15);
207+ if(fb->base_update_count == base_update_count)
208+ printk("goldfish_fb_pan_display: timeout wating for base update\n");
209+ return 0;
210+}
211+
212+#ifdef CONFIG_ANDROID_POWER
213+static void goldfish_fb_early_suspend(android_early_suspend_t *h)
214+{
215+ struct goldfish_fb *fb = container_of(h, struct goldfish_fb, early_suspend);
216+ writel(1, fb->reg_base + FB_SET_BLANK);
217+}
218+
219+static void goldfish_fb_late_resume(android_early_suspend_t *h)
220+{
221+ struct goldfish_fb *fb = container_of(h, struct goldfish_fb, early_suspend);
222+ writel(0, fb->reg_base + FB_SET_BLANK);
223+}
224+#endif
225+
226+static struct fb_ops goldfish_fb_ops = {
227+ .owner = THIS_MODULE,
228+ .fb_check_var = goldfish_fb_check_var,
229+ .fb_set_par = goldfish_fb_set_par,
230+ .fb_setcolreg = goldfish_fb_setcolreg,
231+ .fb_pan_display = goldfish_fb_pan_display,
232+ .fb_fillrect = cfb_fillrect,
233+ .fb_copyarea = cfb_copyarea,
234+ .fb_imageblit = cfb_imageblit,
235+};
236+
237+
238+static int goldfish_fb_probe(struct platform_device *pdev)
239+{
240+ int ret;
241+ struct resource *r;
242+ struct goldfish_fb *fb;
243+ size_t framesize;
244+ uint32_t width, height;
245+ dma_addr_t fbpaddr;
246+
247+ fb = kzalloc(sizeof(*fb), GFP_KERNEL);
248+ if(fb == NULL) {
249+ ret = -ENOMEM;
250+ goto err_fb_alloc_failed;
251+ }
252+ spin_lock_init(&fb->lock);
253+ init_waitqueue_head(&fb->wait);
254+ platform_set_drvdata(pdev, fb);
255+
256+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
257+ if(r == NULL) {
258+ ret = -ENODEV;
259+ goto err_no_io_base;
260+ }
261+ fb->reg_base = IO_ADDRESS(r->start - IO_START);
262+
263+ fb->irq = platform_get_irq(pdev, 0);
264+ if(fb->irq < 0) {
265+ ret = -ENODEV;
266+ goto err_no_irq;
267+ }
268+
269+ width = readl(fb->reg_base + FB_GET_WIDTH);
270+ height = readl(fb->reg_base + FB_GET_HEIGHT);
271+
272+ fb->fb.fbops = &goldfish_fb_ops;
273+ fb->fb.flags = FBINFO_FLAG_DEFAULT;
274+ fb->fb.pseudo_palette = fb->cmap;
275+ //strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
276+ fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
277+ fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
278+ fb->fb.fix.line_length = width * 2;
279+ fb->fb.fix.accel = FB_ACCEL_NONE;
280+ fb->fb.fix.ypanstep = 1;
281+
282+ fb->fb.var.xres = width;
283+ fb->fb.var.yres = height;
284+ fb->fb.var.xres_virtual = width;
285+ fb->fb.var.yres_virtual = height * 2;
286+ fb->fb.var.bits_per_pixel = 16;
287+ fb->fb.var.activate = FB_ACTIVATE_NOW;
288+ fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
289+ fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
290+
291+ fb->fb.var.red.offset = 11;
292+ fb->fb.var.red.length = 5;
293+ fb->fb.var.green.offset = 5;
294+ fb->fb.var.green.length = 6;
295+ fb->fb.var.blue.offset = 0;
296+ fb->fb.var.blue.length = 5;
297+
298+ framesize = width * height * 2 * 2;
299+ fb->fb.screen_base = dma_alloc_writecombine(&pdev->dev, framesize,
300+ &fbpaddr, GFP_KERNEL);
301+ printk("allocating frame buffer %d * %d, got %p\n", width, height, fb->fb.screen_base);
302+ if(fb->fb.screen_base == 0) {
303+ ret = -ENOMEM;
304+ goto err_alloc_screen_base_failed;
305+ }
306+ fb->fb.fix.smem_start = fbpaddr;
307+ fb->fb.fix.smem_len = framesize;
308+
309+ ret = fb_set_var(&fb->fb, &fb->fb.var);
310+ if(ret)
311+ goto err_fb_set_var_failed;
312+
313+ ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED, pdev->name, fb);
314+ if(ret)
315+ goto err_request_irq_failed;
316+
317+ writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
318+ goldfish_fb_pan_display(&fb->fb.var, &fb->fb); // updates base
319+
320+ ret = register_framebuffer(&fb->fb);
321+ if(ret)
322+ goto err_register_framebuffer_failed;
323+
324+#ifdef CONFIG_ANDROID_POWER
325+ fb->early_suspend.suspend = goldfish_fb_early_suspend;
326+ fb->early_suspend.resume = goldfish_fb_late_resume;
327+ android_register_early_suspend(&fb->early_suspend);
328+#endif
329+
330+ return 0;
331+
332+
333+err_register_framebuffer_failed:
334+ free_irq(fb->irq, fb);
335+err_request_irq_failed:
336+err_fb_set_var_failed:
337+ dma_free_writecombine(&pdev->dev, framesize, fb->fb.screen_base, fb->fb.fix.smem_start);
338+err_alloc_screen_base_failed:
339+err_no_irq:
340+err_no_io_base:
341+ kfree(fb);
342+err_fb_alloc_failed:
343+ return ret;
344+}
345+
346+static int goldfish_fb_remove(struct platform_device *pdev)
347+{
348+ size_t framesize;
349+ struct goldfish_fb *fb = platform_get_drvdata(pdev);
350+
351+ framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
352+
353+#ifdef CONFIG_ANDROID_POWER
354+ android_unregister_early_suspend(&fb->early_suspend);
355+#endif
356+ unregister_framebuffer(&fb->fb);
357+ free_irq(fb->irq, fb);
358+ dma_free_writecombine(&pdev->dev, framesize, fb->fb.screen_base, fb->fb.fix.smem_start);
359+ kfree(fb);
360+ return 0;
361+}
362+
363+
364+static struct platform_driver goldfish_fb_driver = {
365+ .probe = goldfish_fb_probe,
366+ .remove = goldfish_fb_remove,
367+ .driver = {
368+ .name = "goldfish_fb"
369+ }
370+};
371+
372+static int __init goldfish_fb_init(void)
373+{
374+ return platform_driver_register(&goldfish_fb_driver);
375+}
376+
377+static void __exit goldfish_fb_exit(void)
378+{
379+ platform_driver_unregister(&goldfish_fb_driver);
380+}
381+
382+module_init(goldfish_fb_init);
383+module_exit(goldfish_fb_exit);
384+
385

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