327 lines
8.3 KiB
C
327 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007 Google, Inc.
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* Copyright (C) 2012 Intel, Inc.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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enum {
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FB_GET_WIDTH = 0x00,
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FB_GET_HEIGHT = 0x04,
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FB_INT_STATUS = 0x08,
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FB_INT_ENABLE = 0x0c,
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FB_SET_BASE = 0x10,
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FB_SET_ROTATION = 0x14,
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FB_SET_BLANK = 0x18,
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FB_GET_PHYS_WIDTH = 0x1c,
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FB_GET_PHYS_HEIGHT = 0x20,
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FB_INT_VSYNC = 1U << 0,
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FB_INT_BASE_UPDATE_DONE = 1U << 1
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};
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struct goldfish_fb {
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void __iomem *reg_base;
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int irq;
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spinlock_t lock;
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wait_queue_head_t wait;
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int base_update_count;
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int rotation;
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struct fb_info fb;
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u32 cmap[16];
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};
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static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
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{
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unsigned long irq_flags;
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struct goldfish_fb *fb = dev_id;
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u32 status;
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spin_lock_irqsave(&fb->lock, irq_flags);
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status = readl(fb->reg_base + FB_INT_STATUS);
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if (status & FB_INT_BASE_UPDATE_DONE) {
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fb->base_update_count++;
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wake_up(&fb->wait);
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}
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spin_unlock_irqrestore(&fb->lock, irq_flags);
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return status ? IRQ_HANDLED : IRQ_NONE;
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}
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static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
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{
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unsigned int mask = (1 << bf->length) - 1;
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return (val >> (16 - bf->length) & mask) << bf->offset;
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}
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static int
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goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
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unsigned int blue, unsigned int transp, struct fb_info *info)
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{
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struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
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if (regno < 16) {
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fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
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convert_bitfield(blue, &fb->fb.var.blue) |
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convert_bitfield(green, &fb->fb.var.green) |
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convert_bitfield(red, &fb->fb.var.red);
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return 0;
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} else {
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return 1;
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}
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}
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static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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if ((var->rotate & 1) != (info->var.rotate & 1)) {
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if ((var->xres != info->var.yres) ||
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(var->yres != info->var.xres) ||
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(var->xres_virtual != info->var.yres) ||
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(var->yres_virtual > info->var.xres * 2) ||
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(var->yres_virtual < info->var.xres)) {
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return -EINVAL;
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}
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} else {
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if ((var->xres != info->var.xres) ||
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(var->yres != info->var.yres) ||
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(var->xres_virtual != info->var.xres) ||
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(var->yres_virtual > info->var.yres * 2) ||
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(var->yres_virtual < info->var.yres)) {
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return -EINVAL;
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}
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}
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if ((var->xoffset != info->var.xoffset) ||
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(var->bits_per_pixel != info->var.bits_per_pixel) ||
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(var->grayscale != info->var.grayscale)) {
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return -EINVAL;
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}
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return 0;
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}
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static int goldfish_fb_set_par(struct fb_info *info)
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{
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struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
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if (fb->rotation != fb->fb.var.rotate) {
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info->fix.line_length = info->var.xres * 2;
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fb->rotation = fb->fb.var.rotate;
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writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
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}
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return 0;
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}
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static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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unsigned long irq_flags;
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int base_update_count;
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struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
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spin_lock_irqsave(&fb->lock, irq_flags);
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base_update_count = fb->base_update_count;
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writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
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fb->reg_base + FB_SET_BASE);
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spin_unlock_irqrestore(&fb->lock, irq_flags);
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wait_event_timeout(fb->wait,
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fb->base_update_count != base_update_count, HZ / 15);
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if (fb->base_update_count == base_update_count)
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pr_err("%s: timeout waiting for base update\n", __func__);
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return 0;
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}
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static int goldfish_fb_blank(int blank, struct fb_info *info)
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{
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struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
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switch (blank) {
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case FB_BLANK_NORMAL:
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writel(1, fb->reg_base + FB_SET_BLANK);
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break;
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case FB_BLANK_UNBLANK:
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writel(0, fb->reg_base + FB_SET_BLANK);
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break;
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}
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return 0;
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}
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static const struct fb_ops goldfish_fb_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = goldfish_fb_check_var,
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.fb_set_par = goldfish_fb_set_par,
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.fb_setcolreg = goldfish_fb_setcolreg,
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.fb_pan_display = goldfish_fb_pan_display,
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.fb_blank = goldfish_fb_blank,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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static int goldfish_fb_probe(struct platform_device *pdev)
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{
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int ret;
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struct resource *r;
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struct goldfish_fb *fb;
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size_t framesize;
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u32 width, height;
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dma_addr_t fbpaddr;
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fb = kzalloc(sizeof(*fb), GFP_KERNEL);
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if (fb == NULL) {
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ret = -ENOMEM;
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goto err_fb_alloc_failed;
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}
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spin_lock_init(&fb->lock);
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init_waitqueue_head(&fb->wait);
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platform_set_drvdata(pdev, fb);
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (r == NULL) {
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ret = -ENODEV;
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goto err_no_io_base;
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}
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fb->reg_base = ioremap(r->start, PAGE_SIZE);
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if (fb->reg_base == NULL) {
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ret = -ENOMEM;
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goto err_no_io_base;
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}
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fb->irq = platform_get_irq(pdev, 0);
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if (fb->irq <= 0) {
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ret = -ENODEV;
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goto err_no_irq;
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}
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width = readl(fb->reg_base + FB_GET_WIDTH);
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height = readl(fb->reg_base + FB_GET_HEIGHT);
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fb->fb.fbops = &goldfish_fb_ops;
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fb->fb.flags = FBINFO_FLAG_DEFAULT;
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fb->fb.pseudo_palette = fb->cmap;
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fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
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fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
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fb->fb.fix.line_length = width * 2;
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fb->fb.fix.accel = FB_ACCEL_NONE;
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fb->fb.fix.ypanstep = 1;
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fb->fb.var.xres = width;
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fb->fb.var.yres = height;
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fb->fb.var.xres_virtual = width;
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fb->fb.var.yres_virtual = height * 2;
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fb->fb.var.bits_per_pixel = 16;
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fb->fb.var.activate = FB_ACTIVATE_NOW;
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fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
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fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
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fb->fb.var.pixclock = 0;
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fb->fb.var.red.offset = 11;
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fb->fb.var.red.length = 5;
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fb->fb.var.green.offset = 5;
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fb->fb.var.green.length = 6;
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fb->fb.var.blue.offset = 0;
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fb->fb.var.blue.length = 5;
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framesize = width * height * 2 * 2;
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fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
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&pdev->dev, framesize,
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&fbpaddr, GFP_KERNEL);
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pr_debug("allocating frame buffer %d * %d, got %p\n",
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width, height, fb->fb.screen_base);
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if (fb->fb.screen_base == NULL) {
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ret = -ENOMEM;
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goto err_alloc_screen_base_failed;
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}
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fb->fb.fix.smem_start = fbpaddr;
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fb->fb.fix.smem_len = framesize;
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ret = fb_set_var(&fb->fb, &fb->fb.var);
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if (ret)
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goto err_fb_set_var_failed;
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ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
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pdev->name, fb);
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if (ret)
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goto err_request_irq_failed;
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writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
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goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */
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ret = register_framebuffer(&fb->fb);
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if (ret)
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goto err_register_framebuffer_failed;
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return 0;
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err_register_framebuffer_failed:
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free_irq(fb->irq, fb);
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err_request_irq_failed:
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err_fb_set_var_failed:
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dma_free_coherent(&pdev->dev, framesize,
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(void *)fb->fb.screen_base,
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fb->fb.fix.smem_start);
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err_alloc_screen_base_failed:
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err_no_irq:
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iounmap(fb->reg_base);
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err_no_io_base:
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kfree(fb);
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err_fb_alloc_failed:
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return ret;
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}
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static int goldfish_fb_remove(struct platform_device *pdev)
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{
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size_t framesize;
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struct goldfish_fb *fb = platform_get_drvdata(pdev);
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framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
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unregister_framebuffer(&fb->fb);
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free_irq(fb->irq, fb);
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dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
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fb->fb.fix.smem_start);
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iounmap(fb->reg_base);
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kfree(fb);
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return 0;
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}
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static const struct of_device_id goldfish_fb_of_match[] = {
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{ .compatible = "google,goldfish-fb", },
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{},
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};
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MODULE_DEVICE_TABLE(of, goldfish_fb_of_match);
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static const struct acpi_device_id goldfish_fb_acpi_match[] = {
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{ "GFSH0004", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, goldfish_fb_acpi_match);
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static struct platform_driver goldfish_fb_driver = {
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.probe = goldfish_fb_probe,
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.remove = goldfish_fb_remove,
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.driver = {
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.name = "goldfish_fb",
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.of_match_table = goldfish_fb_of_match,
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.acpi_match_table = ACPI_PTR(goldfish_fb_acpi_match),
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}
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};
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module_platform_driver(goldfish_fb_driver);
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MODULE_LICENSE("GPL v2");
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