diff options
Diffstat (limited to 'target/linux/ubicom32/files/drivers/video/ubicom32fb.c')
| -rw-r--r-- | target/linux/ubicom32/files/drivers/video/ubicom32fb.c | 779 |
1 files changed, 779 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/drivers/video/ubicom32fb.c b/target/linux/ubicom32/files/drivers/video/ubicom32fb.c new file mode 100644 index 0000000000..4193560f7c --- /dev/null +++ b/target/linux/ubicom32/files/drivers/video/ubicom32fb.c @@ -0,0 +1,779 @@ +/* + * 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); |