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bcm2708_fb.c
1286 lines (1102 loc) · 34.1 KB
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bcm2708_fb.c
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/*
* linux/drivers/video/bcm2708_fb.c
*
* Copyright (C) 2010 Broadcom
* Copyright (C) 2018 Raspberry Pi (Trading) Ltd
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* Broadcom simple framebuffer driver
*
* This file is derived from cirrusfb.c
* Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/platform_data/dma-bcm2708.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/printk.h>
#include <linux/console.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/cred.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#include <linux/mutex.h>
//#define BCM2708_FB_DEBUG
#define MODULE_NAME "bcm2708_fb"
#ifdef BCM2708_FB_DEBUG
#define print_debug(fmt, ...) pr_debug("%s:%s:%d: " fmt, \
MODULE_NAME, __func__, __LINE__, ##__VA_ARGS__)
#else
#define print_debug(fmt, ...)
#endif
/* This is limited to 16 characters when displayed by X startup */
static const char *bcm2708_name = "BCM2708 FB";
#define DRIVER_NAME "bcm2708_fb"
static int fbwidth = 800; /* module parameter */
static int fbheight = 480; /* module parameter */
static int fbdepth = 32; /* module parameter */
static int fbswap; /* module parameter */
static u32 dma_busy_wait_threshold = 1 << 15;
module_param(dma_busy_wait_threshold, int, 0644);
MODULE_PARM_DESC(dma_busy_wait_threshold, "Busy-wait for DMA completion below this area");
struct fb_alloc_tags {
struct rpi_firmware_property_tag_header tag1;
u32 xres, yres;
struct rpi_firmware_property_tag_header tag2;
u32 xres_virtual, yres_virtual;
struct rpi_firmware_property_tag_header tag3;
u32 bpp;
struct rpi_firmware_property_tag_header tag4;
u32 xoffset, yoffset;
struct rpi_firmware_property_tag_header tag5;
u32 base, screen_size;
struct rpi_firmware_property_tag_header tag6;
u32 pitch;
};
struct bcm2708_fb_stats {
struct debugfs_regset32 regset;
u32 dma_copies;
u32 dma_irqs;
};
struct vc4_display_settings_t {
u32 display_num;
u32 width;
u32 height;
u32 depth;
u32 pitch;
u32 virtual_width;
u32 virtual_height;
u32 virtual_width_offset;
u32 virtual_height_offset;
unsigned long fb_bus_address;
};
struct bcm2708_fb_dev;
struct bcm2708_fb {
struct fb_info fb;
struct platform_device *dev;
u32 cmap[16];
u32 gpu_cmap[256];
struct dentry *debugfs_dir;
struct dentry *debugfs_subdir;
unsigned long fb_bus_address;
struct { u32 base, length; } gpu;
struct vc4_display_settings_t display_settings;
struct debugfs_regset32 screeninfo_regset;
struct bcm2708_fb_dev *fbdev;
unsigned int image_size;
dma_addr_t dma_addr;
void *cpuaddr;
};
#define MAX_FRAMEBUFFERS 3
struct bcm2708_fb_dev {
int firmware_supports_multifb;
/* Protects the DMA system from multiple FB access */
struct mutex dma_mutex;
int dma_chan;
int dma_irq;
void __iomem *dma_chan_base;
wait_queue_head_t dma_waitq;
bool disable_arm_alloc;
struct bcm2708_fb_stats dma_stats;
void *cb_base; /* DMA control blocks */
dma_addr_t cb_handle;
int instance_count;
int num_displays;
struct rpi_firmware *fw;
struct bcm2708_fb displays[MAX_FRAMEBUFFERS];
};
#define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb)
static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb)
{
debugfs_remove_recursive(fb->debugfs_subdir);
fb->debugfs_subdir = NULL;
fb->fbdev->instance_count--;
if (!fb->fbdev->instance_count) {
debugfs_remove_recursive(fb->debugfs_dir);
fb->debugfs_dir = NULL;
}
}
static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb)
{
char buf[3];
struct bcm2708_fb_dev *fbdev = fb->fbdev;
static struct debugfs_reg32 stats_registers[] = {
{"dma_copies", offsetof(struct bcm2708_fb_stats, dma_copies)},
{"dma_irqs", offsetof(struct bcm2708_fb_stats, dma_irqs)},
};
static struct debugfs_reg32 screeninfo[] = {
{"width", offsetof(struct fb_var_screeninfo, xres)},
{"height", offsetof(struct fb_var_screeninfo, yres)},
{"bpp", offsetof(struct fb_var_screeninfo, bits_per_pixel)},
{"xres_virtual", offsetof(struct fb_var_screeninfo, xres_virtual)},
{"yres_virtual", offsetof(struct fb_var_screeninfo, yres_virtual)},
{"xoffset", offsetof(struct fb_var_screeninfo, xoffset)},
{"yoffset", offsetof(struct fb_var_screeninfo, yoffset)},
};
fb->debugfs_dir = debugfs_lookup(DRIVER_NAME, NULL);
if (!fb->debugfs_dir)
fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL);
if (!fb->debugfs_dir) {
dev_warn(fb->fb.dev, "%s: could not create debugfs folder\n",
__func__);
return -EFAULT;
}
snprintf(buf, sizeof(buf), "%u", fb->display_settings.display_num);
fb->debugfs_subdir = debugfs_create_dir(buf, fb->debugfs_dir);
if (!fb->debugfs_subdir) {
dev_warn(fb->fb.dev, "%s: could not create debugfs entry %u\n",
__func__, fb->display_settings.display_num);
return -EFAULT;
}
fbdev->dma_stats.regset.regs = stats_registers;
fbdev->dma_stats.regset.nregs = ARRAY_SIZE(stats_registers);
fbdev->dma_stats.regset.base = &fbdev->dma_stats;
if (!debugfs_create_regset32("dma_stats", 0444, fb->debugfs_subdir,
&fbdev->dma_stats.regset)) {
dev_warn(fb->fb.dev, "%s: could not create statistics registers\n",
__func__);
goto fail;
}
fb->screeninfo_regset.regs = screeninfo;
fb->screeninfo_regset.nregs = ARRAY_SIZE(screeninfo);
fb->screeninfo_regset.base = &fb->fb.var;
if (!debugfs_create_regset32("screeninfo", 0444, fb->debugfs_subdir,
&fb->screeninfo_regset)) {
dev_warn(fb->fb.dev,
"%s: could not create dimensions registers\n",
__func__);
goto fail;
}
fbdev->instance_count++;
return 0;
fail:
bcm2708_fb_debugfs_deinit(fb);
return -EFAULT;
}
static void set_display_num(struct bcm2708_fb *fb)
{
if (fb && fb->fbdev && fb->fbdev->firmware_supports_multifb) {
u32 tmp = fb->display_settings.display_num;
if (rpi_firmware_property(fb->fbdev->fw,
RPI_FIRMWARE_FRAMEBUFFER_SET_DISPLAY_NUM,
&tmp,
sizeof(tmp)))
dev_warn_once(fb->fb.dev,
"Set display number call failed. Old GPU firmware?");
}
}
static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
{
int ret = 0;
memset(&var->transp, 0, sizeof(var->transp));
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
switch (var->bits_per_pixel) {
case 1:
case 2:
case 4:
case 8:
var->red.length = var->bits_per_pixel;
var->red.offset = 0;
var->green.length = var->bits_per_pixel;
var->green.offset = 0;
var->blue.length = var->bits_per_pixel;
var->blue.offset = 0;
break;
case 16:
var->red.length = 5;
var->blue.length = 5;
/*
* Green length can be 5 or 6 depending whether
* we're operating in RGB555 or RGB565 mode.
*/
if (var->green.length != 5 && var->green.length != 6)
var->green.length = 6;
break;
case 24:
var->red.length = 8;
var->blue.length = 8;
var->green.length = 8;
break;
case 32:
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 8;
break;
default:
ret = -EINVAL;
break;
}
/*
* >= 16bpp displays have separate colour component bitfields
* encoded in the pixel data. Calculate their position from
* the bitfield length defined above.
*/
if (ret == 0 && var->bits_per_pixel >= 24 && fbswap) {
var->blue.offset = 0;
var->green.offset = var->blue.offset + var->blue.length;
var->red.offset = var->green.offset + var->green.length;
var->transp.offset = var->red.offset + var->red.length;
} else if (ret == 0 && var->bits_per_pixel >= 24) {
var->red.offset = 0;
var->green.offset = var->red.offset + var->red.length;
var->blue.offset = var->green.offset + var->green.length;
var->transp.offset = var->blue.offset + var->blue.length;
} else if (ret == 0 && var->bits_per_pixel >= 16) {
var->blue.offset = 0;
var->green.offset = var->blue.offset + var->blue.length;
var->red.offset = var->green.offset + var->green.length;
var->transp.offset = var->red.offset + var->red.length;
}
return ret;
}
static int bcm2708_fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
/* info input, var output */
print_debug("%s(%p) %ux%u (%ux%u), %ul, %u\n",
__func__, info, info->var.xres, info->var.yres,
info->var.xres_virtual, info->var.yres_virtual,
info->screen_size, info->var.bits_per_pixel);
print_debug("%s(%p) %ux%u (%ux%u), %u\n", __func__, var, var->xres,
var->yres, var->xres_virtual, var->yres_virtual,
var->bits_per_pixel);
if (!var->bits_per_pixel)
var->bits_per_pixel = 16;
if (bcm2708_fb_set_bitfields(var) != 0) {
pr_err("%s: invalid bits_per_pixel %d\n", __func__,
var->bits_per_pixel);
return -EINVAL;
}
if (var->xres_virtual < var->xres)
var->xres_virtual = var->xres;
/* use highest possible virtual resolution */
if (var->yres_virtual == -1) {
var->yres_virtual = 480;
pr_err("%s: virtual resolution set to maximum of %dx%d\n",
__func__, var->xres_virtual, var->yres_virtual);
}
if (var->yres_virtual < var->yres)
var->yres_virtual = var->yres;
if (var->xoffset < 0)
var->xoffset = 0;
if (var->yoffset < 0)
var->yoffset = 0;
/* truncate xoffset and yoffset to maximum if too high */
if (var->xoffset > var->xres_virtual - var->xres)
var->xoffset = var->xres_virtual - var->xres - 1;
if (var->yoffset > var->yres_virtual - var->yres)
var->yoffset = var->yres_virtual - var->yres - 1;
return 0;
}
static int bcm2708_fb_set_par(struct fb_info *info)
{
struct bcm2708_fb *fb = to_bcm2708(info);
struct fb_alloc_tags fbinfo = {
.tag1 = { RPI_FIRMWARE_FRAMEBUFFER_SET_PHYSICAL_WIDTH_HEIGHT,
8, 0, },
.xres = info->var.xres,
.yres = info->var.yres,
.tag2 = { RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_WIDTH_HEIGHT,
8, 0, },
.xres_virtual = info->var.xres_virtual,
.yres_virtual = info->var.yres_virtual,
.tag3 = { RPI_FIRMWARE_FRAMEBUFFER_SET_DEPTH, 4, 0 },
.bpp = info->var.bits_per_pixel,
.tag4 = { RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET, 8, 0 },
.xoffset = info->var.xoffset,
.yoffset = info->var.yoffset,
.tag5 = { RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE, 8, 0 },
/* base and screen_size will be initialised later */
.tag6 = { RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH, 4, 0 },
/* pitch will be initialised later */
};
int ret, image_size;
print_debug("%s(%p) %dx%d (%dx%d), %d, %d (display %d)\n", __func__,
info,
info->var.xres, info->var.yres, info->var.xres_virtual,
info->var.yres_virtual, (int)info->screen_size,
info->var.bits_per_pixel, value);
/* Need to set the display number to act on first
* Cannot do it in the tag list because on older firmware the call
* will fail and stop the rest of the list being executed.
* We can ignore this call failing as the default at other end is 0
*/
set_display_num(fb);
/* Try allocating our own buffer. We can specify all the parameters */
image_size = ((info->var.xres * info->var.yres) *
info->var.bits_per_pixel) >> 3;
if (!fb->fbdev->disable_arm_alloc &&
(image_size != fb->image_size || !fb->dma_addr)) {
if (fb->dma_addr) {
dma_free_coherent(info->device, fb->image_size,
fb->cpuaddr, fb->dma_addr);
fb->image_size = 0;
fb->cpuaddr = NULL;
fb->dma_addr = 0;
}
fb->cpuaddr = dma_alloc_coherent(info->device, image_size,
&fb->dma_addr, GFP_KERNEL);
if (!fb->cpuaddr) {
fb->dma_addr = 0;
fb->fbdev->disable_arm_alloc = true;
} else {
fb->image_size = image_size;
}
}
if (fb->cpuaddr) {
fbinfo.base = fb->dma_addr;
fbinfo.screen_size = image_size;
fbinfo.pitch = (info->var.xres * info->var.bits_per_pixel) >> 3;
ret = rpi_firmware_property_list(fb->fbdev->fw, &fbinfo,
sizeof(fbinfo));
if (ret || fbinfo.base != fb->dma_addr) {
/* Firmware either failed, or assigned a different base
* address (ie it doesn't support being passed an FB
* allocation).
* Destroy the allocation, and don't try again.
*/
dma_free_coherent(info->device, fb->image_size,
fb->cpuaddr, fb->dma_addr);
fb->image_size = 0;
fb->cpuaddr = NULL;
fb->dma_addr = 0;
fb->fbdev->disable_arm_alloc = true;
}
} else {
/* Our allocation failed - drop into the old scheme of
* allocation by the VPU.
*/
ret = -ENOMEM;
}
if (ret) {
/* Old scheme:
* - FRAMEBUFFER_ALLOCATE passes 0 for base and screen_size.
* - GET_PITCH instead of SET_PITCH.
*/
fbinfo.base = 0;
fbinfo.screen_size = 0;
fbinfo.tag6.tag = RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH;
fbinfo.pitch = 0;
ret = rpi_firmware_property_list(fb->fbdev->fw, &fbinfo,
sizeof(fbinfo));
if (ret) {
dev_err(info->device,
"Failed to allocate GPU framebuffer (%d)\n",
ret);
return ret;
}
}
if (info->var.bits_per_pixel <= 8)
fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
fb->fb.fix.line_length = fbinfo.pitch;
fbinfo.base |= 0x40000000;
fb->fb_bus_address = fbinfo.base;
fbinfo.base &= ~0xc0000000;
fb->fb.fix.smem_start = fbinfo.base;
fb->fb.fix.smem_len = fbinfo.pitch * fbinfo.yres_virtual;
fb->fb.screen_size = fbinfo.screen_size;
if (!fb->dma_addr) {
if (fb->fb.screen_base)
iounmap(fb->fb.screen_base);
fb->fb.screen_base = ioremap_wc(fbinfo.base,
fb->fb.screen_size);
} else {
fb->fb.screen_base = fb->cpuaddr;
}
if (!fb->fb.screen_base) {
/* the console may currently be locked */
console_trylock();
console_unlock();
dev_err(info->device, "Failed to set screen_base\n");
return -ENOMEM;
}
print_debug("%s: start = %p,%p width=%d, height=%d, bpp=%d, pitch=%d size=%d\n",
__func__, (void *)fb->fb.screen_base,
(void *)fb->fb_bus_address, fbinfo.xres, fbinfo.yres,
fbinfo.bpp, fbinfo.pitch, (int)fb->fb.screen_size);
return 0;
}
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 bcm2708_fb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info)
{
struct bcm2708_fb *fb = to_bcm2708(info);
if (fb->fb.var.bits_per_pixel <= 8) {
if (regno < 256) {
/* blue [23:16], green [15:8], red [7:0] */
fb->gpu_cmap[regno] = ((red >> 8) & 0xff) << 0 |
((green >> 8) & 0xff) << 8 |
((blue >> 8) & 0xff) << 16;
}
/* Hack: we need to tell GPU the palette has changed, but
* currently bcm2708_fb_set_par takes noticeable time when
* called for every (256) colour
* So just call it for what looks like the last colour in a
* list for now.
*/
if (regno == 15 || regno == 255) {
struct packet {
u32 offset;
u32 length;
u32 cmap[256];
} *packet;
int ret;
packet = kmalloc(sizeof(*packet), GFP_KERNEL);
if (!packet)
return -ENOMEM;
packet->offset = 0;
packet->length = regno + 1;
memcpy(packet->cmap, fb->gpu_cmap,
sizeof(packet->cmap));
set_display_num(fb);
ret = rpi_firmware_property(fb->fbdev->fw,
RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE,
packet,
(2 + packet->length) * sizeof(u32));
if (ret || packet->offset)
dev_err(info->device,
"Failed to set palette (%d,%u)\n",
ret, packet->offset);
kfree(packet);
}
} else 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 regno > 255;
}
static int bcm2708_fb_blank(int blank_mode, struct fb_info *info)
{
struct bcm2708_fb *fb = to_bcm2708(info);
u32 value;
int ret;
switch (blank_mode) {
case FB_BLANK_UNBLANK:
value = 0;
break;
case FB_BLANK_NORMAL:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_POWERDOWN:
value = 1;
break;
default:
return -EINVAL;
}
set_display_num(fb);
ret = rpi_firmware_property(fb->fbdev->fw, RPI_FIRMWARE_FRAMEBUFFER_BLANK,
&value, sizeof(value));
if (ret)
dev_err(info->device, "%s(%d) failed: %d\n", __func__,
blank_mode, ret);
return ret;
}
static int bcm2708_fb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
s32 result;
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
result = bcm2708_fb_set_par(info);
if (result != 0)
pr_err("%s(%u,%u) returns=%d\n", __func__, var->xoffset,
var->yoffset, result);
return result;
}
static void dma_memcpy(struct bcm2708_fb *fb, dma_addr_t dst, dma_addr_t src,
int size)
{
struct bcm2708_fb_dev *fbdev = fb->fbdev;
struct bcm2708_dma_cb *cb = fbdev->cb_base;
int burst_size = (fbdev->dma_chan == 0) ? 8 : 2;
cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH |
BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH |
BCM2708_DMA_D_INC;
cb->dst = dst;
cb->src = src;
cb->length = size;
cb->stride = 0;
cb->pad[0] = 0;
cb->pad[1] = 0;
cb->next = 0;
// Not sure what to do if this gets a signal whilst waiting
if (mutex_lock_interruptible(&fbdev->dma_mutex))
return;
if (size < dma_busy_wait_threshold) {
bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
bcm_dma_wait_idle(fbdev->dma_chan_base);
} else {
void __iomem *local_dma_chan = fbdev->dma_chan_base;
cb->info |= BCM2708_DMA_INT_EN;
bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
while (bcm_dma_is_busy(local_dma_chan)) {
wait_event_interruptible(fbdev->dma_waitq,
!bcm_dma_is_busy(local_dma_chan));
}
fbdev->dma_stats.dma_irqs++;
}
fbdev->dma_stats.dma_copies++;
mutex_unlock(&fbdev->dma_mutex);
}
/* address with no aliases */
#define INTALIAS_NORMAL(x) ((x) & ~0xc0000000)
/* cache coherent but non-allocating in L1 and L2 */
#define INTALIAS_L1L2_NONALLOCATING(x) (((x) & ~0xc0000000) | 0x80000000)
static long vc_mem_copy(struct bcm2708_fb *fb, struct fb_dmacopy *ioparam)
{
size_t size = PAGE_SIZE;
u32 *buf = NULL;
dma_addr_t bus_addr;
long rc = 0;
size_t offset;
/* restrict this to root user */
if (!uid_eq(current_euid(), GLOBAL_ROOT_UID)) {
rc = -EFAULT;
goto out;
}
if (!fb->gpu.base || !fb->gpu.length) {
pr_err("[%s]: Unable to determine gpu memory (%x,%x)\n",
__func__, fb->gpu.base, fb->gpu.length);
return -EFAULT;
}
if (INTALIAS_NORMAL(ioparam->src) < fb->gpu.base ||
INTALIAS_NORMAL(ioparam->src) >= fb->gpu.base + fb->gpu.length) {
pr_err("[%s]: Invalid memory access %x (%x-%x)", __func__,
INTALIAS_NORMAL(ioparam->src), fb->gpu.base,
fb->gpu.base + fb->gpu.length);
return -EFAULT;
}
buf = dma_alloc_coherent(fb->fb.device, PAGE_ALIGN(size), &bus_addr,
GFP_ATOMIC);
if (!buf) {
pr_err("[%s]: failed to dma_alloc_coherent(%zd)\n", __func__,
size);
rc = -ENOMEM;
goto out;
}
for (offset = 0; offset < ioparam->length; offset += size) {
size_t remaining = ioparam->length - offset;
size_t s = min(size, remaining);
u8 *p = (u8 *)((uintptr_t)ioparam->src + offset);
u8 *q = (u8 *)ioparam->dst + offset;
dma_memcpy(fb, bus_addr,
INTALIAS_L1L2_NONALLOCATING((dma_addr_t)p), size);
if (copy_to_user(q, buf, s) != 0) {
pr_err("[%s]: failed to copy-to-user\n", __func__);
rc = -EFAULT;
goto out;
}
}
out:
if (buf)
dma_free_coherent(fb->fb.device, PAGE_ALIGN(size), buf,
bus_addr);
return rc;
}
static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct bcm2708_fb *fb = to_bcm2708(info);
u32 dummy = 0;
int ret;
switch (cmd) {
case FBIO_WAITFORVSYNC:
set_display_num(fb);
ret = rpi_firmware_property(fb->fbdev->fw,
RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC,
&dummy, sizeof(dummy));
break;
case FBIODMACOPY:
{
struct fb_dmacopy ioparam;
/* Get the parameter data.
*/
if (copy_from_user
(&ioparam, (void *)arg, sizeof(ioparam))) {
pr_err("[%s]: failed to copy-from-user\n", __func__);
ret = -EFAULT;
break;
}
ret = vc_mem_copy(fb, &ioparam);
break;
}
default:
dev_dbg(info->device, "Unknown ioctl 0x%x\n", cmd);
return -ENOTTY;
}
if (ret)
dev_err(info->device, "ioctl 0x%x failed (%d)\n", cmd, ret);
return ret;
}
#ifdef CONFIG_COMPAT
struct fb_dmacopy32 {
compat_uptr_t dst;
__u32 src;
__u32 length;
};
#define FBIODMACOPY32 _IOW('z', 0x22, struct fb_dmacopy32)
static int bcm2708_compat_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct bcm2708_fb *fb = to_bcm2708(info);
int ret;
switch (cmd) {
case FBIODMACOPY32:
{
struct fb_dmacopy32 param32;
struct fb_dmacopy param;
/* Get the parameter data.
*/
if (copy_from_user(¶m32, (void *)arg, sizeof(param32))) {
pr_err("[%s]: failed to copy-from-user\n", __func__);
ret = -EFAULT;
break;
}
param.dst = compat_ptr(param32.dst);
param.src = param32.src;
param.length = param32.length;
ret = vc_mem_copy(fb, ¶m);
break;
}
default:
ret = bcm2708_ioctl(info, cmd, arg);
break;
}
return ret;
}
#endif
static void bcm2708_fb_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
cfb_fillrect(info, rect);
}
/* A helper function for configuring dma control block */
static void set_dma_cb(struct bcm2708_dma_cb *cb,
int burst_size,
dma_addr_t dst,
int dst_stride,
dma_addr_t src,
int src_stride,
int w,
int h)
{
cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH |
BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH |
BCM2708_DMA_D_INC | BCM2708_DMA_TDMODE;
cb->dst = dst;
cb->src = src;
/*
* This is not really obvious from the DMA documentation,
* but the top 16 bits must be programmmed to "height -1"
* and not "height" in 2D mode.
*/
cb->length = ((h - 1) << 16) | w;
cb->stride = ((dst_stride - w) << 16) | (u16)(src_stride - w);
cb->pad[0] = 0;
cb->pad[1] = 0;
}
static void bcm2708_fb_copyarea(struct fb_info *info,
const struct fb_copyarea *region)
{
struct bcm2708_fb *fb = to_bcm2708(info);
struct bcm2708_fb_dev *fbdev = fb->fbdev;
struct bcm2708_dma_cb *cb = fbdev->cb_base;
int bytes_per_pixel = (info->var.bits_per_pixel + 7) >> 3;
/* Channel 0 supports larger bursts and is a bit faster */
int burst_size = (fbdev->dma_chan == 0) ? 8 : 2;
int pixels = region->width * region->height;
/* If DMA is currently in use (ie being used on another FB), then
* rather than wait for it to finish, just use the cfb_copyarea
*/
if (!mutex_trylock(&fbdev->dma_mutex) ||
bytes_per_pixel > 4 ||
info->var.xres * info->var.yres > 1920 * 1200 ||
region->width <= 0 || region->width > info->var.xres ||
region->height <= 0 || region->height > info->var.yres ||
region->sx < 0 || region->sx >= info->var.xres ||
region->sy < 0 || region->sy >= info->var.yres ||
region->dx < 0 || region->dx >= info->var.xres ||
region->dy < 0 || region->dy >= info->var.yres ||
region->sx + region->width > info->var.xres ||
region->dx + region->width > info->var.xres ||
region->sy + region->height > info->var.yres ||
region->dy + region->height > info->var.yres) {
cfb_copyarea(info, region);
return;
}
if (region->dy == region->sy && region->dx > region->sx) {
/*
* A difficult case of overlapped copy. Because DMA can't
* copy individual scanlines in backwards direction, we need
* two-pass processing. We do it by programming a chain of dma
* control blocks in the first 16K part of the buffer and use
* the remaining 48K as the intermediate temporary scratch
* buffer. The buffer size is sufficient to handle up to
* 1920x1200 resolution at 32bpp pixel depth.
*/
int y;
dma_addr_t control_block_pa = fbdev->cb_handle;
dma_addr_t scratchbuf = fbdev->cb_handle + 16 * 1024;
int scanline_size = bytes_per_pixel * region->width;
int scanlines_per_cb = (64 * 1024 - 16 * 1024) / scanline_size;
for (y = 0; y < region->height; y += scanlines_per_cb) {
dma_addr_t src =
fb->fb_bus_address +
bytes_per_pixel * region->sx +
(region->sy + y) * fb->fb.fix.line_length;
dma_addr_t dst =
fb->fb_bus_address +
bytes_per_pixel * region->dx +
(region->dy + y) * fb->fb.fix.line_length;
if (region->height - y < scanlines_per_cb)
scanlines_per_cb = region->height - y;
set_dma_cb(cb, burst_size, scratchbuf, scanline_size,
src, fb->fb.fix.line_length,
scanline_size, scanlines_per_cb);
control_block_pa += sizeof(struct bcm2708_dma_cb);
cb->next = control_block_pa;
cb++;
set_dma_cb(cb, burst_size, dst, fb->fb.fix.line_length,
scratchbuf, scanline_size,
scanline_size, scanlines_per_cb);
control_block_pa += sizeof(struct bcm2708_dma_cb);
cb->next = control_block_pa;
cb++;
}
/* move the pointer back to the last dma control block */
cb--;
} else {
/* A single dma control block is enough. */
int sy, dy, stride;
if (region->dy <= region->sy) {
/* processing from top to bottom */
dy = region->dy;
sy = region->sy;
stride = fb->fb.fix.line_length;
} else {
/* processing from bottom to top */
dy = region->dy + region->height - 1;
sy = region->sy + region->height - 1;
stride = -fb->fb.fix.line_length;
}
set_dma_cb(cb, burst_size,
fb->fb_bus_address + dy * fb->fb.fix.line_length +
bytes_per_pixel * region->dx,
stride,
fb->fb_bus_address + sy * fb->fb.fix.line_length +
bytes_per_pixel * region->sx,
stride,
region->width * bytes_per_pixel,
region->height);
}
/* end of dma control blocks chain */
cb->next = 0;
if (pixels < dma_busy_wait_threshold) {
bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
bcm_dma_wait_idle(fbdev->dma_chan_base);
} else {
void __iomem *local_dma_chan = fbdev->dma_chan_base;
cb->info |= BCM2708_DMA_INT_EN;
bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle);
while (bcm_dma_is_busy(local_dma_chan)) {
wait_event_interruptible(fbdev->dma_waitq,
!bcm_dma_is_busy(local_dma_chan));
}
fbdev->dma_stats.dma_irqs++;
}
fbdev->dma_stats.dma_copies++;
mutex_unlock(&fbdev->dma_mutex);
}
static void bcm2708_fb_imageblit(struct fb_info *info,
const struct fb_image *image)
{
cfb_imageblit(info, image);
}
static irqreturn_t bcm2708_fb_dma_irq(int irq, void *cxt)
{
struct bcm2708_fb_dev *fbdev = cxt;
/* FIXME: should read status register to check if this is
* actually interrupting us or not, in case this interrupt
* ever becomes shared amongst several DMA channels
*
* readl(dma_chan_base + BCM2708_DMA_CS) & BCM2708_DMA_IRQ;
*/
/* acknowledge the interrupt */
writel(BCM2708_DMA_INT, fbdev->dma_chan_base + BCM2708_DMA_CS);
wake_up(&fbdev->dma_waitq);
return IRQ_HANDLED;
}
static struct fb_ops bcm2708_fb_ops = {
.owner = THIS_MODULE,
.fb_check_var = bcm2708_fb_check_var,
.fb_set_par = bcm2708_fb_set_par,
.fb_setcolreg = bcm2708_fb_setcolreg,
.fb_blank = bcm2708_fb_blank,
.fb_fillrect = bcm2708_fb_fillrect,
.fb_copyarea = bcm2708_fb_copyarea,
.fb_imageblit = bcm2708_fb_imageblit,
.fb_pan_display = bcm2708_fb_pan_display,
.fb_ioctl = bcm2708_ioctl,
#ifdef CONFIG_COMPAT
.fb_compat_ioctl = bcm2708_compat_ioctl,
#endif
};