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openwrt-xburst/target/linux/ubicom32/files/drivers/video/ubicom32fb.c
kaloz 1a29ef8e97 [ubicom32]: move new files out from platform support patch
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19815 3c298f89-4303-0410-b956-a3cf2f4a3e73
2010-02-22 13:54:47 +00:00

780 lines
18 KiB
C

/*
* drivers/video/ubicom32fb.c
* Ubicom32 frame buffer driver
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port 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.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
/*
* This driver was based on skeletonfb.c, Skeleton for a frame buffer device by
* Geert Uytterhoeven.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/ip5000.h>
#include <asm/vdc_tio.h>
#include <asm/ubicom32fb.h>
#define DRIVER_NAME "ubicom32fb"
#define DRIVER_DESCRIPTION "Ubicom32 frame buffer driver"
#define PALETTE_ENTRIES_NO 16
/*
* Option variables
*
* vram_size: VRAM size in kilobytes, subject to alignment
*/
static int vram_size = 0;
module_param(vram_size, int, 0);
MODULE_PARM_DESC(vram, "VRAM size, in kilobytes to allocate, should be at least the size of one screen, subject to alignment");
static int init_value = 0;
module_param(init_value, int, 0);
MODULE_PARM_DESC(init, "Initial value of the framebuffer (16-bit number).");
/*
* fb_fix_screeninfo defines the non-changeable properties of the VDC, depending on what mode it is in.
*/
static struct fb_fix_screeninfo ubicom32fb_fix = {
.id = "Ubicom32",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_TRUECOLOR,
.accel = FB_ACCEL_UBICOM32,
};
/*
* Filled in at probe time when we find out what the hardware supports
*/
static struct fb_var_screeninfo ubicom32fb_var;
/*
* Private data structure
*/
struct ubicom32fb_drvdata {
struct fb_info *fbinfo;
bool cmap_alloc;
/*
* The address of the framebuffer in memory
*/
void *fb;
void *fb_aligned;
/*
* Total size of vram including alignment allowance
*/
u32 total_vram_size;
/*
* Interrupt to set when changing registers
*/
u32 vp_int;
/*
* Optional: Interrupt used by TIO to signal us
*/
u32 rx_int;
/*
* Base address of the regs for VDC_TIO
*/
volatile struct vdc_tio_vp_regs *regs;
/*
* non-zero if we are in yuv mode
*/
u8_t is_yuv;
/*
* Fake palette of 16 colors
*/
u32 pseudo_palette[PALETTE_ENTRIES_NO];
/*
* Wait queue and lock used to block when we need to wait
* for something to happen.
*/
wait_queue_head_t waitq;
struct mutex lock;
};
/*
* ubicom32fb_set_next_frame
* Sets the next frame buffer to display
*
* if sync is TRUE then this function will block until the hardware
* acknowledges the change
*/
static inline void ubicom32fb_set_next_frame(struct ubicom32fb_drvdata *ud, void *fb, u8_t sync)
{
ud->regs->next_frame_flags = ud->is_yuv ? VDCTIO_NEXT_FRAME_FLAG_YUV : 0;
ud->regs->next_frame = (void *)((u32_t)fb | 1);
/*
* If we have interrupts, then we can wait on it
*/
if (ud->rx_int != -1) {
DEFINE_WAIT(wait);
unsigned long flags;
spin_lock_irqsave(&ud->lock, flags);
prepare_to_wait(&ud->waitq, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&ud->lock, flags);
schedule();
finish_wait(&ud->waitq, &wait);
return;
}
/*
* No interrupt, we will just spin here
*/
while (sync && ((u32_t)ud->regs->next_frame & 1));
}
/*
* ubicom32fb_send_command
* Sends a command/data pair to the VDC
*/
static inline void ubicom32fb_send_command(struct ubicom32fb_drvdata *ud, u16 command, u8_t block)
{
ud->regs->command = command;
ubicom32_set_interrupt(ud->vp_int);
while (block && ud->regs->command);
}
/*
* ubicom32fb_ioctl
* Handles any ioctls sent to us
*/
static int ubicom32fb_ioctl(struct fb_info *fbi, unsigned int cmd,
unsigned long arg)
{
struct ubicom32fb_drvdata *ud = (struct ubicom32fb_drvdata *)fbi->par;
void __user *argp = (void __user *)arg;
int retval = -EFAULT;
switch (cmd) {
case UBICOM32FB_IOCTL_SET_NEXT_FRAME_SYNC:
// check alignment, return -EINVAL if necessary
ubicom32fb_set_next_frame(ud, argp, 1);
retval = 0;
break;
case UBICOM32FB_IOCTL_SET_NEXT_FRAME:
// check alignment, return -EINVAL if necessary
ubicom32fb_set_next_frame(ud, argp, 0);
retval = 0;
break;
case UBICOM32FB_IOCTL_SET_MODE:
if (!(ud->regs->caps & VDCTIO_CAPS_SUPPORTS_SCALING)) {
break;
} else {
struct ubicom32fb_mode mode;
volatile struct vdc_tio_vp_regs *regs = ud->regs;
u32_t flags = 0;
if (copy_from_user(&mode, argp, sizeof(mode))) {
break;
}
regs->x_in = mode.width;
regs->y_in = mode.height;
regs->x_out = regs->xres;
regs->y_out = regs->yres;
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_YUV_SCAN_ORDER) {
flags |= VDCTIO_SCALE_FLAG_YUV_SCAN_ORDER;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_YUV_BLOCK_ORDER) {
flags |= VDCTIO_SCALE_FLAG_YUV_BLOCK_ORDER;
}
ud->is_yuv = mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_YUV;
if (ud->is_yuv) {
flags |= VDCTIO_SCALE_FLAG_YUV;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_VRANGE_16_255) {
flags |= VDCTIO_SCALE_FLAG_VRANGE_16_255;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_VRANGE_0_255) {
flags |= VDCTIO_SCALE_FLAG_VRANGE_0_255;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_VSUB) {
flags |= VDCTIO_SCALE_FLAG_VSUB;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_HSUB_2_1) {
flags |= VDCTIO_SCALE_FLAG_HSUB_2_1;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_HSUB_1_1) {
flags |= VDCTIO_SCALE_FLAG_HSUB_1_1;
}
if (mode.flags & UBICOM32FB_IOCTL_SET_MODE_FLAG_SCALE_ENABLE) {
flags |= VDCTIO_SCALE_FLAG_ENABLE;
}
if (mode.next_frame) {
flags |= VDCTIO_SCALE_FLAG_SET_FRAME_BUFFER;
regs->next_frame = mode.next_frame;
}
regs->scale_flags = flags;
ubicom32fb_send_command(ud, VDCTIO_COMMAND_SET_SCALE_MODE, 1);
retval = 0;
break;
}
default:
retval = -ENOIOCTLCMD;
break;
}
return retval;
}
/*
* ubicom32fb_interrupt
* Called by the OS when the TIO has set the rx_int
*/
static irqreturn_t ubicom32fb_interrupt(int vec, void *appdata)
{
struct ubicom32fb_drvdata *ud = (struct ubicom32fb_drvdata *)appdata;
spin_lock(&ud->lock);
if (waitqueue_active(&ud->waitq)) {
wake_up(&ud->waitq);
}
spin_unlock(&ud->lock);
return IRQ_HANDLED;
}
/*
* ubicom32fb_pan_display
* Pans the display to a given location. Supports only y direction panning.
*/
static int ubicom32fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
{
struct ubicom32fb_drvdata *ud = (struct ubicom32fb_drvdata *)fbi->par;
void *new_addr;
/*
* Get the last y line that would be displayed. Since we don't support YWRAP,
* it must be less than our virtual y size.
*/
u32 lasty = var->yoffset + var->yres;
if (lasty > fbi->var.yres_virtual) {
/*
* We would fall off the end of our frame buffer if we panned here.
*/
return -EINVAL;
}
if (var->xoffset) {
/*
* We don't support panning in the x direction
*/
return -EINVAL;
}
/*
* Everything looks sane, go ahead and pan
*
* We have to calculate a new address for the VDC to look at
*/
new_addr = ud->fb_aligned + (var->yoffset * fbi->fix.line_length);
/*
* Send down the command. The buffer will switch at the next vertical blank
*/
ubicom32fb_set_next_frame(ud, (void *)new_addr, 0);
return 0;
}
/*
* ubicom32fb_setcolreg
* Sets a color in our virtual palette
*/
static int ubicom32fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
{
u32 *palette = fbi->pseudo_palette;
if (regno >= PALETTE_ENTRIES_NO) {
return -EINVAL;
}
/*
* We only use 8 bits from each color
*/
red >>= 8;
green >>= 8;
blue >>= 8;
/*
* Convert any grayscale values
*/
if (fbi->var.grayscale) {
u16 gray = red + green + blue;
gray += (gray >> 2) + (gray >> 3) - (gray >> 7);
gray >>= 2;
if (gray > 255) {
gray = 255;
}
red = gray;
blue = gray;
green = gray;
}
palette[regno] = (red << fbi->var.red.offset) | (green << fbi->var.green.offset) |
(blue << fbi->var.blue.offset);
return 0;
}
/*
* ubicom32fb_mmap
*/
static int ubicom32fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct ubicom32fb_drvdata *drvdata = (struct ubicom32fb_drvdata *)info->par;
vma->vm_start = (unsigned long)(drvdata->fb_aligned);
vma->vm_end = vma->vm_start + info->fix.smem_len;
/* For those who don't understand how mmap works, go read
* Documentation/nommu-mmap.txt.
* For those that do, you will know that the VM_MAYSHARE flag
* must be set in the vma->vm_flags structure on noMMU
* Other flags can be set, and are documented in
* include/linux/mm.h
*/
vma->vm_flags |= VM_MAYSHARE | VM_SHARED;
return 0;
}
/*
* ubicom32fb_blank
*/
static int ubicom32fb_blank(int blank_mode, struct fb_info *fbi)
{
return 0;
#if 0
struct ubicom32fb_drvdata *drvdata = to_ubicom32fb_drvdata(fbi);
switch (blank_mode) {
case FB_BLANK_UNBLANK:
/* turn on panel */
ubicom32fb_out_be32(drvdata, REG_CTRL, drvdata->reg_ctrl_default);
break;
case FB_BLANK_NORMAL:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_POWERDOWN:
/* turn off panel */
ubicom32fb_out_be32(drvdata, REG_CTRL, 0);
default:
break;
}
return 0; /* success */
#endif
}
static struct fb_ops ubicom32fb_ops =
{
.owner = THIS_MODULE,
.fb_pan_display = ubicom32fb_pan_display,
.fb_setcolreg = ubicom32fb_setcolreg,
.fb_blank = ubicom32fb_blank,
.fb_mmap = ubicom32fb_mmap,
.fb_ioctl = ubicom32fb_ioctl,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
/*
* ubicom32fb_release
*/
static int ubicom32fb_release(struct device *dev)
{
struct ubicom32fb_drvdata *ud = dev_get_drvdata(dev);
#if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
//ubicom32fb_blank(VESA_POWERDOWN, &drvdata->info);
#endif
unregister_framebuffer(ud->fbinfo);
if (ud->cmap_alloc) {
fb_dealloc_cmap(&ud->fbinfo->cmap);
}
if (ud->fb) {
kfree(ud->fb);
}
if (ud->rx_int != -1) {
free_irq(ud->rx_int, ud);
}
/*
* Turn off the display
*/
//ubicom32fb_out_be32(drvdata, REG_CTRL, 0);
//iounmap(drvdata->regs);
framebuffer_release(ud->fbinfo);
dev_set_drvdata(dev, NULL);
return 0;
}
/*
* ubicom32fb_platform_probe
*/
static int __init ubicom32fb_platform_probe(struct platform_device *pdev)
{
struct ubicom32fb_drvdata *ud;
struct resource *irq_resource_rx;
struct resource *irq_resource_tx;
struct resource *mem_resource;
struct fb_info *fbinfo;
int rc;
size_t fbsize;
struct device *dev = &pdev->dev;
int offset;
struct vdc_tio_vp_regs *regs;
/*
* Get our resources
*/
irq_resource_tx = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq_resource_tx) {
dev_err(dev, "No tx IRQ resource assigned\n");
return -ENODEV;
}
irq_resource_rx = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
if (!irq_resource_rx) {
dev_err(dev, "No rx IRQ resource assigned\n");
return -ENODEV;
}
mem_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_resource || !mem_resource->start) {
dev_err(dev, "No mem resource assigned\n");
return -ENODEV;
}
regs = (struct vdc_tio_vp_regs *)mem_resource->start;
if (regs->version != VDCTIO_VP_VERSION) {
dev_err(dev, "VDCTIO is not compatible with this driver tio:%x drv:%x\n",
regs->version, VDCTIO_VP_VERSION);
return -ENODEV;
}
/*
* This is the minimum VRAM size
*/
fbsize = regs->xres * regs->yres * (regs->bpp / 8);
if (!vram_size) {
vram_size = (fbsize + 1023) / 1024;
} else {
if (fbsize > (vram_size * 1024)) {
dev_err(dev, "Not enough VRAM for display, need >= %u bytes\n", fbsize);
return -ENOMEM; // should be ebadparam?
}
}
/*
* Allocate the framebuffer instance + our private data
*/
fbinfo = framebuffer_alloc(sizeof(struct ubicom32fb_drvdata), &pdev->dev);
if (!fbinfo) {
dev_err(dev, "Not enough memory to allocate instance.\n");
return -ENOMEM;
}
/*
* Fill in our private data.
*/
ud = (struct ubicom32fb_drvdata *)fbinfo->par;
ud->fbinfo = fbinfo;
ud->regs = (struct vdc_tio_vp_regs *)(mem_resource->start);
dev_set_drvdata(dev, ud);
ud->vp_int = irq_resource_tx->start;
/*
* If we were provided an rx_irq then we need to init the appropriate
* queues, locks, and functions.
*/
ud->rx_int = -1;
if (irq_resource_rx->start != DEVTREE_IRQ_NONE) {
init_waitqueue_head(&ud->waitq);
mutex_init(&ud->lock);
if (request_irq(ud->rx_int, ubicom32fb_interrupt, IRQF_SHARED, "ubicom32fb_rx", ud)) {
dev_err(dev, "Couldn't request rx IRQ\n");
rc = -ENOMEM;
goto fail;
}
ud->rx_int = irq_resource_rx->start;
}
/*
* Allocate and align the requested amount of VRAM
*/
ud->total_vram_size = (vram_size * 1024) + regs->fb_align;
ud->fb = kmalloc(ud->total_vram_size, GFP_KERNEL);
if (ud->fb == NULL) {
dev_err(dev, "Couldn't allocate VRAM\n");
rc = -ENOMEM;
goto fail;
}
offset = (u32_t)ud->fb & (regs->fb_align - 1);
if (!offset) {
ud->fb_aligned = ud->fb;
} else {
offset = regs->fb_align - offset;
ud->fb_aligned = ud->fb + offset;
}
/*
* Clear the entire frame buffer
*/
if (!init_value) {
memset(ud->fb_aligned, 0, vram_size * 1024);
} else {
unsigned short *p = ud->fb_aligned;
int i;
for (i = 0; i < ((vram_size * 1024) / sizeof(u16_t)); i++) {
*p++ = init_value;
}
}
/*
* Fill in the fb_var_screeninfo structure
*/
memset(&ubicom32fb_var, 0, sizeof(ubicom32fb_var));
ubicom32fb_var.bits_per_pixel = regs->bpp;
ubicom32fb_var.red.offset = regs->rshift;
ubicom32fb_var.green.offset = regs->gshift;
ubicom32fb_var.blue.offset = regs->bshift;
ubicom32fb_var.red.length = regs->rbits;
ubicom32fb_var.green.length = regs->gbits;
ubicom32fb_var.blue.length = regs->bbits;
ubicom32fb_var.activate = FB_ACTIVATE_NOW;
#if 0
/*
* Turn on the display
*/
ud->reg_ctrl_default = REG_CTRL_ENABLE;
if (regs->rotate_screen)
ud->reg_ctrl_default |= REG_CTRL_ROTATE;
ubicom32fb_out_be32(ud, REG_CTRL, ud->reg_ctrl_default);
#endif
/*
* Fill in the fb_info structure
*/
ud->fbinfo->device = dev;
ud->fbinfo->screen_base = (void *)ud->fb_aligned;
ud->fbinfo->fbops = &ubicom32fb_ops;
ud->fbinfo->fix = ubicom32fb_fix;
ud->fbinfo->fix.smem_start = (u32)ud->fb_aligned;
ud->fbinfo->fix.smem_len = vram_size * 1024;
ud->fbinfo->fix.line_length = regs->xres * (regs->bpp / 8);
ud->fbinfo->fix.mmio_start = (u32)regs;
ud->fbinfo->fix.mmio_len = sizeof(struct vdc_tio_vp_regs);
/*
* We support panning in the y direction only
*/
ud->fbinfo->fix.xpanstep = 0;
ud->fbinfo->fix.ypanstep = 1;
ud->fbinfo->pseudo_palette = ud->pseudo_palette;
ud->fbinfo->flags = FBINFO_DEFAULT;
ud->fbinfo->var = ubicom32fb_var;
ud->fbinfo->var.xres = regs->xres;
ud->fbinfo->var.yres = regs->yres;
/*
* We cannot pan in the X direction, so xres_virtual is regs->xres
* We can pan in the Y direction, so yres_virtual is vram_size / ud->fbinfo->fix.line_length
*/
ud->fbinfo->var.xres_virtual = regs->xres;
ud->fbinfo->var.yres_virtual = (vram_size * 1024) / ud->fbinfo->fix.line_length;
//ud->fbinfo->var.height = regs->height_mm;
//ud->fbinfo->var.width = regs->width_mm;
/*
* Allocate a color map
*/
rc = fb_alloc_cmap(&ud->fbinfo->cmap, PALETTE_ENTRIES_NO, 0);
if (rc) {
dev_err(dev, "Fail to allocate colormap (%d entries)\n",
PALETTE_ENTRIES_NO);
goto fail;
}
ud->cmap_alloc = true;
/*
* Register new frame buffer
*/
rc = register_framebuffer(ud->fbinfo);
if (rc) {
dev_err(dev, "Could not register frame buffer\n");
goto fail;
}
/*
* Start up the VDC
*/
ud->regs->next_frame = ud->fb;
ubicom32fb_send_command(ud, VDCTIO_COMMAND_START, 0);
/*
* Tell the log we are here
*/
dev_info(dev, "fbaddr=%p align=%p, size=%uKB screen(%ux%u) virt(%ux%u), regs=%p irqtx=%u irqrx=%u\n",
ud->fb, ud->fb_aligned, vram_size, ud->fbinfo->var.xres, ud->fbinfo->var.yres,
ud->fbinfo->var.xres_virtual, ud->fbinfo->var.yres_virtual, ud->regs,
irq_resource_tx->start, irq_resource_rx->start);
/*
* Success
*/
return 0;
fail:
ubicom32fb_release(dev);
return rc;
}
/*
* ubicom32fb_platform_remove
*/
static int ubicom32fb_platform_remove(struct platform_device *pdev)
{
dev_info(&(pdev->dev), "Ubicom32 FB Driver Remove\n");
return ubicom32fb_release(&pdev->dev);
}
static struct platform_driver ubicom32fb_platform_driver = {
.probe = ubicom32fb_platform_probe,
.remove = ubicom32fb_platform_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
#ifndef MODULE
/*
* ubicom32fb_setup
* Process kernel boot options
*/
static int __init ubicom32fb_setup(char *options)
{
char *this_opt;
if (!options || !*options) {
return 0;
}
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt) {
continue;
}
if (!strncmp(this_opt, "init_value=", 10)) {
init_value = simple_strtoul(this_opt + 11, NULL, 0);
continue;
}
if (!strncmp(this_opt, "vram_size=", 10)) {
vram_size = simple_strtoul(this_opt + 10, NULL, 0);
continue;
}
}
return 0;
}
#endif /* MODULE */
/*
* ubicom32fb_init
*/
static int __devinit ubicom32fb_init(void)
{
#ifndef MODULE
/*
* Get kernel boot options (in 'video=ubicom32fb:<options>')
*/
char *option = NULL;
if (fb_get_options(DRIVER_NAME, &option)) {
return -ENODEV;
}
ubicom32fb_setup(option);
#endif /* MODULE */
return platform_driver_register(&ubicom32fb_platform_driver);
}
module_init(ubicom32fb_init);
/*
* ubicom32fb_exit
*/
static void __exit ubicom32fb_exit(void)
{
platform_driver_unregister(&ubicom32fb_platform_driver);
}
module_exit(ubicom32fb_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
MODULE_DESCRIPTION(DRIVER_DESCRIPTION);