318 lines
8.3 KiB
C
318 lines
8.3 KiB
C
/*
|
|
* Copyright (C) 2007 Google, Inc.
|
|
* Copyright (C) 2012 Intel, Inc.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
enum {
|
|
FB_GET_WIDTH = 0x00,
|
|
FB_GET_HEIGHT = 0x04,
|
|
FB_INT_STATUS = 0x08,
|
|
FB_INT_ENABLE = 0x0c,
|
|
FB_SET_BASE = 0x10,
|
|
FB_SET_ROTATION = 0x14,
|
|
FB_SET_BLANK = 0x18,
|
|
FB_GET_PHYS_WIDTH = 0x1c,
|
|
FB_GET_PHYS_HEIGHT = 0x20,
|
|
|
|
FB_INT_VSYNC = 1U << 0,
|
|
FB_INT_BASE_UPDATE_DONE = 1U << 1
|
|
};
|
|
|
|
struct goldfish_fb {
|
|
void __iomem *reg_base;
|
|
int irq;
|
|
spinlock_t lock;
|
|
wait_queue_head_t wait;
|
|
int base_update_count;
|
|
int rotation;
|
|
struct fb_info fb;
|
|
u32 cmap[16];
|
|
};
|
|
|
|
static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
|
|
{
|
|
unsigned long irq_flags;
|
|
struct goldfish_fb *fb = dev_id;
|
|
u32 status;
|
|
|
|
spin_lock_irqsave(&fb->lock, irq_flags);
|
|
status = readl(fb->reg_base + FB_INT_STATUS);
|
|
if (status & FB_INT_BASE_UPDATE_DONE) {
|
|
fb->base_update_count++;
|
|
wake_up(&fb->wait);
|
|
}
|
|
spin_unlock_irqrestore(&fb->lock, irq_flags);
|
|
return status ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
|
|
static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
|
|
{
|
|
unsigned int mask = (1 << bf->length) - 1;
|
|
|
|
return (val >> (16 - bf->length) & mask) << bf->offset;
|
|
}
|
|
|
|
static int
|
|
goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
|
|
unsigned int blue, unsigned int transp, struct fb_info *info)
|
|
{
|
|
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
|
|
|
|
if (regno < 16) {
|
|
fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
|
|
convert_bitfield(blue, &fb->fb.var.blue) |
|
|
convert_bitfield(green, &fb->fb.var.green) |
|
|
convert_bitfield(red, &fb->fb.var.red);
|
|
return 0;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
if ((var->rotate & 1) != (info->var.rotate & 1)) {
|
|
if ((var->xres != info->var.yres) ||
|
|
(var->yres != info->var.xres) ||
|
|
(var->xres_virtual != info->var.yres) ||
|
|
(var->yres_virtual > info->var.xres * 2) ||
|
|
(var->yres_virtual < info->var.xres)) {
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
if ((var->xres != info->var.xres) ||
|
|
(var->yres != info->var.yres) ||
|
|
(var->xres_virtual != info->var.xres) ||
|
|
(var->yres_virtual > info->var.yres * 2) ||
|
|
(var->yres_virtual < info->var.yres)) {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if ((var->xoffset != info->var.xoffset) ||
|
|
(var->bits_per_pixel != info->var.bits_per_pixel) ||
|
|
(var->grayscale != info->var.grayscale)) {
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int goldfish_fb_set_par(struct fb_info *info)
|
|
{
|
|
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
|
|
if (fb->rotation != fb->fb.var.rotate) {
|
|
info->fix.line_length = info->var.xres * 2;
|
|
fb->rotation = fb->fb.var.rotate;
|
|
writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
|
|
struct fb_info *info)
|
|
{
|
|
unsigned long irq_flags;
|
|
int base_update_count;
|
|
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
|
|
|
|
spin_lock_irqsave(&fb->lock, irq_flags);
|
|
base_update_count = fb->base_update_count;
|
|
writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
|
|
fb->reg_base + FB_SET_BASE);
|
|
spin_unlock_irqrestore(&fb->lock, irq_flags);
|
|
wait_event_timeout(fb->wait,
|
|
fb->base_update_count != base_update_count, HZ / 15);
|
|
if (fb->base_update_count == base_update_count)
|
|
pr_err("goldfish_fb_pan_display: timeout waiting for base update\n");
|
|
return 0;
|
|
}
|
|
|
|
static int goldfish_fb_blank(int blank, struct fb_info *info)
|
|
{
|
|
struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
|
|
switch (blank) {
|
|
case FB_BLANK_NORMAL:
|
|
writel(1, fb->reg_base + FB_SET_BLANK);
|
|
break;
|
|
case FB_BLANK_UNBLANK:
|
|
writel(0, fb->reg_base + FB_SET_BLANK);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct fb_ops goldfish_fb_ops = {
|
|
.owner = THIS_MODULE,
|
|
.fb_check_var = goldfish_fb_check_var,
|
|
.fb_set_par = goldfish_fb_set_par,
|
|
.fb_setcolreg = goldfish_fb_setcolreg,
|
|
.fb_pan_display = goldfish_fb_pan_display,
|
|
.fb_blank = goldfish_fb_blank,
|
|
.fb_fillrect = cfb_fillrect,
|
|
.fb_copyarea = cfb_copyarea,
|
|
.fb_imageblit = cfb_imageblit,
|
|
};
|
|
|
|
|
|
static int goldfish_fb_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct resource *r;
|
|
struct goldfish_fb *fb;
|
|
size_t framesize;
|
|
u32 width, height;
|
|
dma_addr_t fbpaddr;
|
|
|
|
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
|
|
if (fb == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_fb_alloc_failed;
|
|
}
|
|
spin_lock_init(&fb->lock);
|
|
init_waitqueue_head(&fb->wait);
|
|
platform_set_drvdata(pdev, fb);
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (r == NULL) {
|
|
ret = -ENODEV;
|
|
goto err_no_io_base;
|
|
}
|
|
fb->reg_base = ioremap(r->start, PAGE_SIZE);
|
|
if (fb->reg_base == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_no_io_base;
|
|
}
|
|
|
|
fb->irq = platform_get_irq(pdev, 0);
|
|
if (fb->irq <= 0) {
|
|
ret = -ENODEV;
|
|
goto err_no_irq;
|
|
}
|
|
|
|
width = readl(fb->reg_base + FB_GET_WIDTH);
|
|
height = readl(fb->reg_base + FB_GET_HEIGHT);
|
|
|
|
fb->fb.fbops = &goldfish_fb_ops;
|
|
fb->fb.flags = FBINFO_FLAG_DEFAULT;
|
|
fb->fb.pseudo_palette = fb->cmap;
|
|
fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
|
|
fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
|
|
fb->fb.fix.line_length = width * 2;
|
|
fb->fb.fix.accel = FB_ACCEL_NONE;
|
|
fb->fb.fix.ypanstep = 1;
|
|
|
|
fb->fb.var.xres = width;
|
|
fb->fb.var.yres = height;
|
|
fb->fb.var.xres_virtual = width;
|
|
fb->fb.var.yres_virtual = height * 2;
|
|
fb->fb.var.bits_per_pixel = 16;
|
|
fb->fb.var.activate = FB_ACTIVATE_NOW;
|
|
fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
|
|
fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
|
|
fb->fb.var.pixclock = 10000;
|
|
|
|
fb->fb.var.red.offset = 11;
|
|
fb->fb.var.red.length = 5;
|
|
fb->fb.var.green.offset = 5;
|
|
fb->fb.var.green.length = 6;
|
|
fb->fb.var.blue.offset = 0;
|
|
fb->fb.var.blue.length = 5;
|
|
|
|
framesize = width * height * 2 * 2;
|
|
fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
|
|
&pdev->dev, framesize,
|
|
&fbpaddr, GFP_KERNEL);
|
|
pr_debug("allocating frame buffer %d * %d, got %p\n",
|
|
width, height, fb->fb.screen_base);
|
|
if (fb->fb.screen_base == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_alloc_screen_base_failed;
|
|
}
|
|
fb->fb.fix.smem_start = fbpaddr;
|
|
fb->fb.fix.smem_len = framesize;
|
|
|
|
ret = fb_set_var(&fb->fb, &fb->fb.var);
|
|
if (ret)
|
|
goto err_fb_set_var_failed;
|
|
|
|
ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
|
|
pdev->name, fb);
|
|
if (ret)
|
|
goto err_request_irq_failed;
|
|
|
|
writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
|
|
goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */
|
|
|
|
ret = register_framebuffer(&fb->fb);
|
|
if (ret)
|
|
goto err_register_framebuffer_failed;
|
|
return 0;
|
|
|
|
err_register_framebuffer_failed:
|
|
free_irq(fb->irq, fb);
|
|
err_request_irq_failed:
|
|
err_fb_set_var_failed:
|
|
dma_free_coherent(&pdev->dev, framesize,
|
|
(void *)fb->fb.screen_base,
|
|
fb->fb.fix.smem_start);
|
|
err_alloc_screen_base_failed:
|
|
err_no_irq:
|
|
iounmap(fb->reg_base);
|
|
err_no_io_base:
|
|
kfree(fb);
|
|
err_fb_alloc_failed:
|
|
return ret;
|
|
}
|
|
|
|
static int goldfish_fb_remove(struct platform_device *pdev)
|
|
{
|
|
size_t framesize;
|
|
struct goldfish_fb *fb = platform_get_drvdata(pdev);
|
|
|
|
framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
|
|
unregister_framebuffer(&fb->fb);
|
|
free_irq(fb->irq, fb);
|
|
|
|
dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
|
|
fb->fb.fix.smem_start);
|
|
iounmap(fb->reg_base);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct platform_driver goldfish_fb_driver = {
|
|
.probe = goldfish_fb_probe,
|
|
.remove = goldfish_fb_remove,
|
|
.driver = {
|
|
.name = "goldfish_fb"
|
|
}
|
|
};
|
|
|
|
module_platform_driver(goldfish_fb_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|