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openwrt/target/linux/ubicom32/files/drivers/video/ubicom32plio80.c

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/*
* drivers/video/ubicom32plio80.c
* Ubicom32 80 bus PLIO 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/>.
*/
/*
* 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/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <asm/plio.h>
#define DRIVER_NAME "ubicom32plio80"
#define DRIVER_DESCRIPTION "Ubicom32 80 bus PLIO 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_size, "VRAM size, in kilobytes to allocate, should be at least the size of one screen, subject to alignment");
static int xres = 240;
module_param(xres, int, 0);
MODULE_PARM_DESC(xres, "x (horizontal) resolution");
static int yres = 320;
module_param(yres, int, 0);
MODULE_PARM_DESC(yres, "y (vertical) resolution");
static int bgr = 0;
module_param(bgr, int, 0);
MODULE_PARM_DESC(bgr, "display is BGR (Blue is MSB)");
#define BITS_PER_PIXEL 16
/*
* Buffer alignment, must not be 0
*/
#define UBICOM32PLIO80_ALIGNMENT 4
/*
* PLIO FSM
* 16-bit data bus on port I
* CS on EXTCTL[6]
* WR on EXTCTL[4]
*/
static const plio_fctl_t plio_fctl = {
.fctl0 = {
.ptif_port_mode = PLIO_PORT_MODE_DI,
.ptif_portd_cfg = 0,
.ptif_porti_cfg = 3,
.edif_ds = 6,
.edif_cmp_mode = 1,
.ecif_extclk_ena = 0, // enable clock output on PD7 table 2.65/p111 says extctl[0]?
.icif_clk_src_sel = PLIO_CLK_IO,
},
.fctl2 = {
.icif_eclk_div = 10,
.icif_iclk_div = 10,
},
};
static const plio_config_t plio_config = {
.pfsm = {
/*
* Table 12.63
*/
.grpsel[0] = {1,1,1,1,1,1,1,1,1,1},
/*
* Table 12.66 Counter load value
*/
.cs_lut[0] = {0,0,0,0,0,0,0,0},
/*
* Table 2.75 PLIO PFSM Configuration Registers
*/
// 3 2 1 0
.extctl_o_lut[0] = {0x3f, 0x2f, 0x3f, 0x3f},
// 7 6 5 4
.extctl_o_lut[1] = {0x3f, 0x3f, 0x3f, 0x2f},
},
.edif = {
.odr_oe = 0xffff,
},
.ecif = {
.output_ena = (1 << 6) | (1 << 4),
},
};
static const u32_t ubicom32plio80_plio_fsm[] = {
// 0-F
0x00070007, 0x00070007,
0x00070007, 0x00070007,
0x00070007, 0x00070007,
0x00070007, 0x00070007,
0x16260806, 0x16260806,
0x16260806, 0x16260806,
0x16260806, 0x16260806,
0x16260806, 0x16260806,
// 10 - 1f
0x22061806, 0x22061806,
0x22061806, 0x22061806,
0x22061806, 0x22061806,
0x22061806, 0x22061806,
0x22061806, 0x22061806,
0x22061806, 0x22061806,
0x22061806, 0x22061806,
0x22061806, 0x22061806,
// 20 - 2f
0x00070806, 0x00070806,
0x00070806, 0x00070806,
0x00070806, 0x00070806,
0x00070806, 0x00070806,
0x00070806, 0x00070806,
0x00070806, 0x00070806,
0x00070806, 0x00070806,
0x00070806, 0x00070806,
};
/*
* fb_fix_screeninfo defines the non-changeable properties of the VDC, depending on what mode it is in.
*/
static struct fb_fix_screeninfo ubicom32plio80_fix = {
.id = "Ubicom32",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_TRUECOLOR,
.accel = FB_ACCEL_UBICOM32_PLIO80,
};
/*
* Filled in at probe time when we find out what the hardware supports
*/
static struct fb_var_screeninfo ubicom32plio80_var;
/*
* Private data structure
*/
struct ubicom32plio80_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;
/*
* Fake palette of 16 colors
*/
u32 pseudo_palette[PALETTE_ENTRIES_NO];
int irq_req;
/*
* Current pointer and bytes left to transfer with the PLIO
*/
void *xfer_ptr;
u32 bytes_to_xfer;
u32 busy;
};
static struct platform_device *ubicom32plio80_platform_device;
/*
* ubicom32plio80_isr
*/
static int ubicom32plio80_isr(int irq, void *appdata)
{
struct ubicom32plio80_drvdata *ud = (struct ubicom32plio80_drvdata *)appdata;
if (!ud->bytes_to_xfer) {
ubicom32_disable_interrupt(TX_FIFO_INT(PLIO_PORT));
PLIO_NBR->intmask.txfifo_wm = 0;
ud->busy = 0;
return IRQ_HANDLED;
}
asm volatile (
".rept 8 \n\t"
"move.4 (%[fifo]), (%[data])4++ \n\t"
".endr \n\t"
: [data] "+a" (ud->xfer_ptr)
: [fifo] "a" (&PLIO_NBR->tx_lo)
);
ud->bytes_to_xfer -= 32;
return IRQ_HANDLED;
}
/*
* ubicom32plio80_update
*/
static void ubicom32plio80_update(struct ubicom32plio80_drvdata *ud, u32 *fb)
{
struct ubicom32_io_port *ri = (struct ubicom32_io_port *)RI;
struct ubicom32_io_port *rd = (struct ubicom32_io_port *)RD;
ud->xfer_ptr = fb;
ud->bytes_to_xfer = (xres * yres * 2) - 64;
ud->busy = 1;
ri->gpio_mask = 0;
rd->gpio_mask &= ~((1 << 4) | (1 << 2));
*(u32 *)(&PLIO_NBR->intclr) = ~0;
PLIO_NBR->intmask.txfifo_wm = 1;
PLIO_NBR->fifo_wm.tx = 8;
ubicom32_enable_interrupt(TX_FIFO_INT(PLIO_PORT));
asm volatile (
".rept 16 \n\t"
"move.4 (%[fifo]), (%[data])4++ \n\t"
".endr \n\t"
: [data] "+a" (ud->xfer_ptr)
: [fifo] "a" (&PLIO_NBR->tx_lo)
);
}
/*
* ubicom32plio80_pan_display
* Pans the display to a given location. Supports only y direction panning.
*/
static int ubicom32plio80_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
{
struct ubicom32plio80_drvdata *ud = (struct ubicom32plio80_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);
return 0;
}
/*
* ubicom32plio80_setcolreg
* Sets a color in our virtual palette
*/
static int ubicom32plio80_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;
}
/*
* ubicom32plio80_mmap
*/
static int ubicom32plio80_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct ubicom32plio80_drvdata *ud = (struct ubicom32plio80_drvdata *)info->par;
vma->vm_start = (unsigned long)(ud->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;
}
/*
* ubicom32plio80_check_var
* Check the var, tweak it but don't change operational parameters.
*/
static int ubicom32plio80_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct ubicom32plio80_drvdata *ud = (struct ubicom32plio80_drvdata *)info->par;
u32 line_size = var->xres * (BITS_PER_PIXEL / 8);
/*
* See if we can handle this bpp
*/
if (var->bits_per_pixel > BITS_PER_PIXEL) {
return -EINVAL;
}
var->bits_per_pixel = BITS_PER_PIXEL;
/*
* See if we have enough memory to handle this resolution
*/
if ((line_size * var->yres * BITS_PER_PIXEL / 8) > ud->total_vram_size) {
return -EINVAL;
}
var->xres_virtual = var->xres;
var->yres_virtual = ud->total_vram_size / line_size;
var->red.length = 5;
var->green.length = 6;
var->green.offset = 5;
var->blue.length = 5;
var->transp.offset = var->transp.length = 0;
if (bgr) {
var->red.offset = 0;
var->blue.offset = 11;
} else {
var->red.offset = 11;
var->blue.offset = 0;
}
var->nonstd = 0;
var->height = -1;
var->width = -1;
var->vmode = FB_VMODE_NONINTERLACED;
var->sync = 0;
return 0;
}
/*
* ubicom32plio80_set_par
* Set the video mode according to info->var
*/
static int ubicom32plio80_set_par(struct fb_info *info)
{
/*
* Anything changed?
*/
if ((xres == info->var.xres) && (yres == info->var.yres)) {
return 0;
}
/*
* Implement changes
*/
xres = info->var.xres;
yres = info->var.yres;
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.xpanstep = 0;
info->fix.ypanstep = 1;
info->fix.line_length = xres * (BITS_PER_PIXEL / 8);
return 0;
}
/*
* ubicom32plio80_ops
* List of supported operations
*/
static struct fb_ops ubicom32plio80_ops =
{
.owner = THIS_MODULE,
.fb_pan_display = ubicom32plio80_pan_display,
.fb_setcolreg = ubicom32plio80_setcolreg,
.fb_mmap = ubicom32plio80_mmap,
.fb_check_var = ubicom32plio80_check_var,
.fb_set_par = ubicom32plio80_set_par,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
/*
* ubicom32plio80_release
*/
static int ubicom32plio80_release(struct device *dev)
{
struct ubicom32plio80_drvdata *ud = dev_get_drvdata(dev);
unregister_framebuffer(ud->fbinfo);
if (ud->irq_req) {
free_irq(TX_FIFO_INT(PLIO_PORT), ud);
}
if (ud->cmap_alloc) {
fb_dealloc_cmap(&ud->fbinfo->cmap);
}
if (ud->fb) {
kfree(ud->fb);
}
framebuffer_release(ud->fbinfo);
dev_set_drvdata(dev, NULL);
return 0;
}
/*
* ubicom32plio80_platform_probe
*/
static int __init ubicom32plio80_platform_probe(struct platform_device *pdev)
{
struct ubicom32plio80_drvdata *ud;
struct fb_info *fbinfo;
int rc;
size_t fbsize;
struct device *dev = &pdev->dev;
int offset;
/*
* This is the minimum VRAM size
*/
fbsize = xres * yres * 2;
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 ubicom32plio80_drvdata), &pdev->dev);
if (!fbinfo) {
dev_err(dev, "Not enough memory to allocate instance.\n");
return -ENOMEM;
}
/*
* Fill in our private data.
*/
ud = (struct ubicom32plio80_drvdata *)fbinfo->par;
ud->fbinfo = fbinfo;
dev_set_drvdata(dev, ud);
/*
* Allocate and align the requested amount of VRAM
*/
ud->total_vram_size = (vram_size * 1024) + UBICOM32PLIO80_ALIGNMENT;
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 & (UBICOM32PLIO80_ALIGNMENT - 1);
if (!offset) {
ud->fb_aligned = ud->fb;
} else {
offset = UBICOM32PLIO80_ALIGNMENT - offset;
ud->fb_aligned = ud->fb + offset;
}
/*
* Clear the entire frame buffer
*/
memset(ud->fb_aligned, 0, vram_size * 1024);
/*
* Fill in the fb_var_screeninfo structure
*/
memset(&ubicom32plio80_var, 0, sizeof(ubicom32plio80_var));
ubicom32plio80_var.bits_per_pixel = BITS_PER_PIXEL;
ubicom32plio80_var.red.length = 5;
ubicom32plio80_var.green.length = 6;
ubicom32plio80_var.green.offset = 5;
ubicom32plio80_var.blue.length = 5;
ubicom32plio80_var.activate = FB_ACTIVATE_NOW;
if (bgr) {
ubicom32plio80_var.red.offset = 0;
ubicom32plio80_var.blue.offset = 11;
} else {
ubicom32plio80_var.red.offset = 11;
ubicom32plio80_var.blue.offset = 0;
}
/*
* Fill in the fb_info structure
*/
ud->fbinfo->device = dev;
ud->fbinfo->screen_base = (void *)ud->fb_aligned;
ud->fbinfo->fbops = &ubicom32plio80_ops;
ud->fbinfo->fix = ubicom32plio80_fix;
ud->fbinfo->fix.smem_start = (u32)ud->fb_aligned;
ud->fbinfo->fix.smem_len = vram_size * 1024;
ud->fbinfo->fix.line_length = xres * 2;
ud->fbinfo->fix.mmio_start = (u32)ud;
ud->fbinfo->fix.mmio_len = sizeof(struct ubicom32plio80_drvdata);
/*
* 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 = ubicom32plio80_var;
ud->fbinfo->var.xres = xres;
ud->fbinfo->var.yres = yres;
/*
* We cannot pan in the X direction, so xres_virtual is xres
* We can pan in the Y direction, so yres_virtual is vram_size / ud->fbinfo->fix.line_length
*/
ud->fbinfo->var.xres_virtual = xres;
ud->fbinfo->var.yres_virtual = (vram_size * 1024) / ud->fbinfo->fix.line_length;
/*
* 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;
}
/*
* request the PLIO IRQ
*/
rc = request_irq(TX_FIFO_INT(PLIO_PORT), ubicom32plio80_isr, IRQF_DISABLED, "ubicom32plio80", ud);
if (rc) {
dev_err(dev, "Could not request IRQ\n");
goto fail;
}
ud->irq_req = 1;
/*
* Clear any garbage out of the TX FIFOs (idif_txfifo_flush)
*
* cast through ubicom32_io_port to make sure the compiler does a word write
*/
((struct ubicom32_io_port *)PLIO_NBR)->int_set = (1 << 18);
/*
* Start up the state machine
*/
plio_init(&plio_fctl, &plio_config, (plio_sram_t *)ubicom32plio80_plio_fsm, sizeof(ubicom32plio80_plio_fsm));
PLIO_NBR->fctl0.pfsm_cmd = 0;
ubicom32plio80_update(ud, ud->fb_aligned);
/*
* Tell the log we are here
*/
dev_info(dev, "fbaddr=%p align=%p, size=%uKB screen(%ux%u) virt(%ux%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);
/*
* Success
*/
return 0;
fail:
ubicom32plio80_release(dev);
return rc;
}
/*
* ubicom32plio80_platform_remove
*/
static int ubicom32plio80_platform_remove(struct platform_device *pdev)
{
dev_info(&(pdev->dev), "Ubicom32 FB Driver Remove\n");
return ubicom32plio80_release(&pdev->dev);
}
static struct platform_driver ubicom32plio80_platform_driver = {
.probe = ubicom32plio80_platform_probe,
.remove = ubicom32plio80_platform_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
#ifndef MODULE
/*
* ubicom32plio80_setup
* Process kernel boot options
*/
static int __init ubicom32plio80_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, "vram_size=", 10)) {
vram_size = simple_strtoul(this_opt + 10, NULL, 0);
continue;
}
if (!strncmp(this_opt, "bgr=", 4)) {
bgr = simple_strtoul(this_opt + 4, NULL, 0);
continue;
}
if (!strncmp(this_opt, "xres=", 5)) {
xres = simple_strtoul(this_opt + 5, NULL, 0);
continue;
}
if (!strncmp(this_opt, "yres=", 5)) {
yres = simple_strtoul(this_opt + 5, NULL, 0);
continue;
}
}
return 0;
}
#endif /* MODULE */
/*
* ubicom32plio80_init
*/
static int __devinit ubicom32plio80_init(void)
{
int ret;
#ifndef MODULE
/*
* Get kernel boot options (in 'video=ubicom32plio80:<options>')
*/
char *option = NULL;
if (fb_get_options(DRIVER_NAME, &option)) {
return -ENODEV;
}
ubicom32plio80_setup(option);
#endif /* MODULE */
ret = platform_driver_register(&ubicom32plio80_platform_driver);
if (!ret) {
ubicom32plio80_platform_device = platform_device_alloc(DRIVER_NAME, 0);
if (ubicom32plio80_platform_device)
ret = platform_device_add(ubicom32plio80_platform_device);
else
ret = -ENOMEM;
if (ret) {
platform_device_put(ubicom32plio80_platform_device);
platform_driver_unregister(&ubicom32plio80_platform_driver);
}
}
return ret;
}
module_init(ubicom32plio80_init);
/*
* ubicom32plio80_exit
*/
static void __exit ubicom32plio80_exit(void)
{
platform_device_unregister(ubicom32plio80_platform_device);
platform_driver_unregister(&ubicom32plio80_platform_driver);
}
module_exit(ubicom32plio80_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick Tjin <@ubicom.com>");
MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
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