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linux-next/drivers/video/fbdev/fsl-diu-fb.c
Kees Cook 4a1208c5b4 video: fbdev: fsl-diu-fb: Remove VLA usage 
In the quest to remove all stack VLA usage from the kernel[1], this moves
the buffer off the stack (since it could be as much as 1024 bytes), and
uses a new area in the cursor data structure. Additionally adds missed
documentation and removes redundant assignments.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Timur Tabi <timur@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
2018-07-24 19:11:26 +02:00

2004 lines
52 KiB
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/*
* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
*
* Freescale DIU Frame Buffer device driver
*
* Authors: Hongjun Chen <hong-jun.chen@freescale.com>
* Paul Widmer <paul.widmer@freescale.com>
* Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
* York Sun <yorksun@freescale.com>
*
* Based on imxfb.c Copyright (C) 2004 S.Hauer, Pengutronix
*
* This program 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.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/spinlock.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <sysdev/fsl_soc.h>
#include <linux/fsl-diu-fb.h>
#include "edid.h"
#define NUM_AOIS 5 /* 1 for plane 0, 2 for planes 1 & 2 each */
/* HW cursor parameters */
#define MAX_CURS 32
/* INT_STATUS/INT_MASK field descriptions */
#define INT_VSYNC 0x01 /* Vsync interrupt */
#define INT_VSYNC_WB 0x02 /* Vsync interrupt for write back operation */
#define INT_UNDRUN 0x04 /* Under run exception interrupt */
#define INT_PARERR 0x08 /* Display parameters error interrupt */
#define INT_LS_BF_VS 0x10 /* Lines before vsync. interrupt */
/*
* List of supported video modes
*
* The first entry is the default video mode. The remain entries are in
* order if increasing resolution and frequency. The 320x240-60 mode is
* the initial AOI for the second and third planes.
*/
static struct fb_videomode fsl_diu_mode_db[] = {
{
.refresh = 60,
.xres = 1024,
.yres = 768,
.pixclock = 15385,
.left_margin = 160,
.right_margin = 24,
.upper_margin = 29,
.lower_margin = 3,
.hsync_len = 136,
.vsync_len = 6,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 320,
.yres = 240,
.pixclock = 79440,
.left_margin = 16,
.right_margin = 16,
.upper_margin = 16,
.lower_margin = 5,
.hsync_len = 48,
.vsync_len = 1,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 39722,
.left_margin = 48,
.right_margin = 16,
.upper_margin = 33,
.lower_margin = 10,
.hsync_len = 96,
.vsync_len = 2,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 72,
.xres = 640,
.yres = 480,
.pixclock = 32052,
.left_margin = 128,
.right_margin = 24,
.upper_margin = 28,
.lower_margin = 9,
.hsync_len = 40,
.vsync_len = 3,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 75,
.xres = 640,
.yres = 480,
.pixclock = 31747,
.left_margin = 120,
.right_margin = 16,
.upper_margin = 16,
.lower_margin = 1,
.hsync_len = 64,
.vsync_len = 3,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 90,
.xres = 640,
.yres = 480,
.pixclock = 25057,
.left_margin = 120,
.right_margin = 32,
.upper_margin = 14,
.lower_margin = 25,
.hsync_len = 40,
.vsync_len = 14,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 100,
.xres = 640,
.yres = 480,
.pixclock = 22272,
.left_margin = 48,
.right_margin = 32,
.upper_margin = 17,
.lower_margin = 22,
.hsync_len = 128,
.vsync_len = 12,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 800,
.yres = 480,
.pixclock = 33805,
.left_margin = 96,
.right_margin = 24,
.upper_margin = 10,
.lower_margin = 3,
.hsync_len = 72,
.vsync_len = 7,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 800,
.yres = 600,
.pixclock = 25000,
.left_margin = 88,
.right_margin = 40,
.upper_margin = 23,
.lower_margin = 1,
.hsync_len = 128,
.vsync_len = 4,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 854,
.yres = 480,
.pixclock = 31518,
.left_margin = 104,
.right_margin = 16,
.upper_margin = 13,
.lower_margin = 1,
.hsync_len = 88,
.vsync_len = 3,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 70,
.xres = 1024,
.yres = 768,
.pixclock = 16886,
.left_margin = 3,
.right_margin = 3,
.upper_margin = 2,
.lower_margin = 2,
.hsync_len = 40,
.vsync_len = 18,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 75,
.xres = 1024,
.yres = 768,
.pixclock = 15009,
.left_margin = 3,
.right_margin = 3,
.upper_margin = 2,
.lower_margin = 2,
.hsync_len = 80,
.vsync_len = 32,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 1280,
.yres = 480,
.pixclock = 18939,
.left_margin = 353,
.right_margin = 47,
.upper_margin = 39,
.lower_margin = 4,
.hsync_len = 8,
.vsync_len = 2,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 1280,
.yres = 720,
.pixclock = 13426,
.left_margin = 192,
.right_margin = 64,
.upper_margin = 22,
.lower_margin = 1,
.hsync_len = 136,
.vsync_len = 3,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 1280,
.yres = 1024,
.pixclock = 9375,
.left_margin = 38,
.right_margin = 128,
.upper_margin = 2,
.lower_margin = 7,
.hsync_len = 216,
.vsync_len = 37,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 70,
.xres = 1280,
.yres = 1024,
.pixclock = 9380,
.left_margin = 6,
.right_margin = 6,
.upper_margin = 4,
.lower_margin = 4,
.hsync_len = 60,
.vsync_len = 94,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 75,
.xres = 1280,
.yres = 1024,
.pixclock = 9380,
.left_margin = 6,
.right_margin = 6,
.upper_margin = 4,
.lower_margin = 4,
.hsync_len = 60,
.vsync_len = 15,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
{
.refresh = 60,
.xres = 1920,
.yres = 1080,
.pixclock = 5787,
.left_margin = 328,
.right_margin = 120,
.upper_margin = 34,
.lower_margin = 1,
.hsync_len = 208,
.vsync_len = 3,
.sync = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED
},
};
static char *fb_mode;
static unsigned long default_bpp = 32;
static enum fsl_diu_monitor_port monitor_port;
static char *monitor_string;
#if defined(CONFIG_NOT_COHERENT_CACHE)
static u8 *coherence_data;
static size_t coherence_data_size;
static unsigned int d_cache_line_size;
#endif
static DEFINE_SPINLOCK(diu_lock);
enum mfb_index {
PLANE0 = 0, /* Plane 0, only one AOI that fills the screen */
PLANE1_AOI0, /* Plane 1, first AOI */
PLANE1_AOI1, /* Plane 1, second AOI */
PLANE2_AOI0, /* Plane 2, first AOI */
PLANE2_AOI1, /* Plane 2, second AOI */
};
struct mfb_info {
enum mfb_index index;
char *id;
int registered;
unsigned long pseudo_palette[16];
struct diu_ad *ad;
unsigned char g_alpha;
unsigned int count;
int x_aoi_d; /* aoi display x offset to physical screen */
int y_aoi_d; /* aoi display y offset to physical screen */
struct fsl_diu_data *parent;
};
/**
* struct fsl_diu_data - per-DIU data structure
* @dma_addr: DMA address of this structure
* @fsl_diu_info: fb_info objects, one per AOI
* @dev_attr: sysfs structure
* @irq: IRQ
* @monitor_port: the monitor port this DIU is connected to
* @diu_reg: pointer to the DIU hardware registers
* @reg_lock: spinlock for register access
* @dummy_aoi: video buffer for the 4x4 32-bit dummy AOI
* dummy_ad: DIU Area Descriptor for the dummy AOI
* @ad[]: Area Descriptors for each real AOI
* @gamma: gamma color table
* @cursor: hardware cursor data
* @blank_cursor: blank cursor for hiding cursor
* @next_cursor: scratch space to build load cursor
* @edid_data: EDID information buffer
* @has_edid: whether or not the EDID buffer is valid
*
* This data structure must be allocated with 32-byte alignment, so that the
* internal fields can be aligned properly.
*/
struct fsl_diu_data {
dma_addr_t dma_addr;
struct fb_info fsl_diu_info[NUM_AOIS];
struct mfb_info mfb[NUM_AOIS];
struct device_attribute dev_attr;
unsigned int irq;
enum fsl_diu_monitor_port monitor_port;
struct diu __iomem *diu_reg;
spinlock_t reg_lock;
u8 dummy_aoi[4 * 4 * 4];
struct diu_ad dummy_ad __aligned(8);
struct diu_ad ad[NUM_AOIS] __aligned(8);
u8 gamma[256 * 3] __aligned(32);
/* It's easier to parse the cursor data as little-endian */
__le16 cursor[MAX_CURS * MAX_CURS] __aligned(32);
/* Blank cursor data -- used to hide the cursor */
__le16 blank_cursor[MAX_CURS * MAX_CURS] __aligned(32);
/* Scratch cursor data -- used to build new cursor */
__le16 next_cursor[MAX_CURS * MAX_CURS] __aligned(32);
uint8_t edid_data[EDID_LENGTH];
bool has_edid;
} __aligned(32);
/* Determine the DMA address of a member of the fsl_diu_data structure */
#define DMA_ADDR(p, f) ((p)->dma_addr + offsetof(struct fsl_diu_data, f))
static const struct mfb_info mfb_template[] = {
{
.index = PLANE0,
.id = "Panel0",
.registered = 0,
.count = 0,
.x_aoi_d = 0,
.y_aoi_d = 0,
},
{
.index = PLANE1_AOI0,
.id = "Panel1 AOI0",
.registered = 0,
.g_alpha = 0xff,
.count = 0,
.x_aoi_d = 0,
.y_aoi_d = 0,
},
{
.index = PLANE1_AOI1,
.id = "Panel1 AOI1",
.registered = 0,
.g_alpha = 0xff,
.count = 0,
.x_aoi_d = 0,
.y_aoi_d = 480,
},
{
.index = PLANE2_AOI0,
.id = "Panel2 AOI0",
.registered = 0,
.g_alpha = 0xff,
.count = 0,
.x_aoi_d = 640,
.y_aoi_d = 0,
},
{
.index = PLANE2_AOI1,
.id = "Panel2 AOI1",
.registered = 0,
.g_alpha = 0xff,
.count = 0,
.x_aoi_d = 640,
.y_aoi_d = 480,
},
};
#ifdef DEBUG
static void __attribute__ ((unused)) fsl_diu_dump(struct diu __iomem *hw)
{
mb();
pr_debug("DIU: desc=%08x,%08x,%08x, gamma=%08x palette=%08x "
"cursor=%08x curs_pos=%08x diu_mode=%08x bgnd=%08x "
"disp_size=%08x hsyn_para=%08x vsyn_para=%08x syn_pol=%08x "
"thresholds=%08x int_mask=%08x plut=%08x\n",
hw->desc[0], hw->desc[1], hw->desc[2], hw->gamma,
hw->palette, hw->cursor, hw->curs_pos, hw->diu_mode,
hw->bgnd, hw->disp_size, hw->hsyn_para, hw->vsyn_para,
hw->syn_pol, hw->thresholds, hw->int_mask, hw->plut);
rmb();
}
#endif
/**
* fsl_diu_name_to_port - convert a port name to a monitor port enum
*
* Takes the name of a monitor port ("dvi", "lvds", or "dlvds") and returns
* the enum fsl_diu_monitor_port that corresponds to that string.
*
* For compatibility with older versions, a number ("0", "1", or "2") is also
* supported.
*
* If the string is unknown, DVI is assumed.
*
* If the particular port is not supported by the platform, another port
* (platform-specific) is chosen instead.
*/
static enum fsl_diu_monitor_port fsl_diu_name_to_port(const char *s)
{
enum fsl_diu_monitor_port port = FSL_DIU_PORT_DVI;
unsigned long val;
if (s) {
if (!kstrtoul(s, 10, &val) && (val <= 2))
port = (enum fsl_diu_monitor_port) val;
else if (strncmp(s, "lvds", 4) == 0)
port = FSL_DIU_PORT_LVDS;
else if (strncmp(s, "dlvds", 5) == 0)
port = FSL_DIU_PORT_DLVDS;
}
if (diu_ops.valid_monitor_port)
port = diu_ops.valid_monitor_port(port);
return port;
}
/*
* Workaround for failed writing desc register of planes.
* Needed with MPC5121 DIU rev 2.0 silicon.
*/
void wr_reg_wa(u32 *reg, u32 val)
{
do {
out_be32(reg, val);
} while (in_be32(reg) != val);
}
static void fsl_diu_enable_panel(struct fb_info *info)
{
struct mfb_info *pmfbi, *cmfbi, *mfbi = info->par;
struct diu_ad *ad = mfbi->ad;
struct fsl_diu_data *data = mfbi->parent;
struct diu __iomem *hw = data->diu_reg;
switch (mfbi->index) {
case PLANE0:
wr_reg_wa(&hw->desc[0], ad->paddr);
break;
case PLANE1_AOI0:
cmfbi = &data->mfb[2];
if (hw->desc[1] != ad->paddr) { /* AOI0 closed */
if (cmfbi->count > 0) /* AOI1 open */
ad->next_ad =
cpu_to_le32(cmfbi->ad->paddr);
else
ad->next_ad = 0;
wr_reg_wa(&hw->desc[1], ad->paddr);
}
break;
case PLANE2_AOI0:
cmfbi = &data->mfb[4];
if (hw->desc[2] != ad->paddr) { /* AOI0 closed */
if (cmfbi->count > 0) /* AOI1 open */
ad->next_ad =
cpu_to_le32(cmfbi->ad->paddr);
else
ad->next_ad = 0;
wr_reg_wa(&hw->desc[2], ad->paddr);
}
break;
case PLANE1_AOI1:
pmfbi = &data->mfb[1];
ad->next_ad = 0;
if (hw->desc[1] == data->dummy_ad.paddr)
wr_reg_wa(&hw->desc[1], ad->paddr);
else /* AOI0 open */
pmfbi->ad->next_ad = cpu_to_le32(ad->paddr);
break;
case PLANE2_AOI1:
pmfbi = &data->mfb[3];
ad->next_ad = 0;
if (hw->desc[2] == data->dummy_ad.paddr)
wr_reg_wa(&hw->desc[2], ad->paddr);
else /* AOI0 was open */
pmfbi->ad->next_ad = cpu_to_le32(ad->paddr);
break;
}
}
static void fsl_diu_disable_panel(struct fb_info *info)
{
struct mfb_info *pmfbi, *cmfbi, *mfbi = info->par;
struct diu_ad *ad = mfbi->ad;
struct fsl_diu_data *data = mfbi->parent;
struct diu __iomem *hw = data->diu_reg;
switch (mfbi->index) {
case PLANE0:
wr_reg_wa(&hw->desc[0], 0);
break;
case PLANE1_AOI0:
cmfbi = &data->mfb[2];
if (cmfbi->count > 0) /* AOI1 is open */
wr_reg_wa(&hw->desc[1], cmfbi->ad->paddr);
/* move AOI1 to the first */
else /* AOI1 was closed */
wr_reg_wa(&hw->desc[1], data->dummy_ad.paddr);
/* close AOI 0 */
break;
case PLANE2_AOI0:
cmfbi = &data->mfb[4];
if (cmfbi->count > 0) /* AOI1 is open */
wr_reg_wa(&hw->desc[2], cmfbi->ad->paddr);
/* move AOI1 to the first */
else /* AOI1 was closed */
wr_reg_wa(&hw->desc[2], data->dummy_ad.paddr);
/* close AOI 0 */
break;
case PLANE1_AOI1:
pmfbi = &data->mfb[1];
if (hw->desc[1] != ad->paddr) {
/* AOI1 is not the first in the chain */
if (pmfbi->count > 0)
/* AOI0 is open, must be the first */
pmfbi->ad->next_ad = 0;
} else /* AOI1 is the first in the chain */
wr_reg_wa(&hw->desc[1], data->dummy_ad.paddr);
/* close AOI 1 */
break;
case PLANE2_AOI1:
pmfbi = &data->mfb[3];
if (hw->desc[2] != ad->paddr) {
/* AOI1 is not the first in the chain */
if (pmfbi->count > 0)
/* AOI0 is open, must be the first */
pmfbi->ad->next_ad = 0;
} else /* AOI1 is the first in the chain */
wr_reg_wa(&hw->desc[2], data->dummy_ad.paddr);
/* close AOI 1 */
break;
}
}
static void enable_lcdc(struct fb_info *info)
{
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
struct diu __iomem *hw = data->diu_reg;
out_be32(&hw->diu_mode, MFB_MODE1);
}
static void disable_lcdc(struct fb_info *info)
{
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
struct diu __iomem *hw = data->diu_reg;
out_be32(&hw->diu_mode, 0);
}
static void adjust_aoi_size_position(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct mfb_info *lower_aoi_mfbi, *upper_aoi_mfbi, *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
int available_height, upper_aoi_bottom;
enum mfb_index index = mfbi->index;
int lower_aoi_is_open, upper_aoi_is_open;
__u32 base_plane_width, base_plane_height, upper_aoi_height;
base_plane_width = data->fsl_diu_info[0].var.xres;
base_plane_height = data->fsl_diu_info[0].var.yres;
if (mfbi->x_aoi_d < 0)
mfbi->x_aoi_d = 0;
if (mfbi->y_aoi_d < 0)
mfbi->y_aoi_d = 0;
switch (index) {
case PLANE0:
if (mfbi->x_aoi_d != 0)
mfbi->x_aoi_d = 0;
if (mfbi->y_aoi_d != 0)
mfbi->y_aoi_d = 0;
break;
case PLANE1_AOI0:
case PLANE2_AOI0:
lower_aoi_mfbi = data->fsl_diu_info[index+1].par;
lower_aoi_is_open = lower_aoi_mfbi->count > 0 ? 1 : 0;
if (var->xres > base_plane_width)
var->xres = base_plane_width;
if ((mfbi->x_aoi_d + var->xres) > base_plane_width)
mfbi->x_aoi_d = base_plane_width - var->xres;
if (lower_aoi_is_open)
available_height = lower_aoi_mfbi->y_aoi_d;
else
available_height = base_plane_height;
if (var->yres > available_height)
var->yres = available_height;
if ((mfbi->y_aoi_d + var->yres) > available_height)
mfbi->y_aoi_d = available_height - var->yres;
break;
case PLANE1_AOI1:
case PLANE2_AOI1:
upper_aoi_mfbi = data->fsl_diu_info[index-1].par;
upper_aoi_height = data->fsl_diu_info[index-1].var.yres;
upper_aoi_bottom = upper_aoi_mfbi->y_aoi_d + upper_aoi_height;
upper_aoi_is_open = upper_aoi_mfbi->count > 0 ? 1 : 0;
if (var->xres > base_plane_width)
var->xres = base_plane_width;
if ((mfbi->x_aoi_d + var->xres) > base_plane_width)
mfbi->x_aoi_d = base_plane_width - var->xres;
if (mfbi->y_aoi_d < 0)
mfbi->y_aoi_d = 0;
if (upper_aoi_is_open) {
if (mfbi->y_aoi_d < upper_aoi_bottom)
mfbi->y_aoi_d = upper_aoi_bottom;
available_height = base_plane_height
- upper_aoi_bottom;
} else
available_height = base_plane_height;
if (var->yres > available_height)
var->yres = available_height;
if ((mfbi->y_aoi_d + var->yres) > base_plane_height)
mfbi->y_aoi_d = base_plane_height - var->yres;
break;
}
}
/*
* Checks to see if the hardware supports the state requested by var passed
* in. This function does not alter the hardware state! If the var passed in
* is slightly off by what the hardware can support then we alter the var
* PASSED in to what we can do. If the hardware doesn't support mode change
* a -EINVAL will be returned by the upper layers.
*/
static int fsl_diu_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
if (var->xres_virtual < var->xres)
var->xres_virtual = var->xres;
if (var->yres_virtual < var->yres)
var->yres_virtual = var->yres;
if (var->xoffset + info->var.xres > info->var.xres_virtual)
var->xoffset = info->var.xres_virtual - info->var.xres;
if (var->yoffset + info->var.yres > info->var.yres_virtual)
var->yoffset = info->var.yres_virtual - info->var.yres;
if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) &&
(var->bits_per_pixel != 16))
var->bits_per_pixel = default_bpp;
switch (var->bits_per_pixel) {
case 16:
var->red.length = 5;
var->red.offset = 11;
var->red.msb_right = 0;
var->green.length = 6;
var->green.offset = 5;
var->green.msb_right = 0;
var->blue.length = 5;
var->blue.offset = 0;
var->blue.msb_right = 0;
var->transp.length = 0;
var->transp.offset = 0;
var->transp.msb_right = 0;
break;
case 24:
var->red.length = 8;
var->red.offset = 0;
var->red.msb_right = 0;
var->green.length = 8;
var->green.offset = 8;
var->green.msb_right = 0;
var->blue.length = 8;
var->blue.offset = 16;
var->blue.msb_right = 0;
var->transp.length = 0;
var->transp.offset = 0;
var->transp.msb_right = 0;
break;
case 32:
var->red.length = 8;
var->red.offset = 16;
var->red.msb_right = 0;
var->green.length = 8;
var->green.offset = 8;
var->green.msb_right = 0;
var->blue.length = 8;
var->blue.offset = 0;
var->blue.msb_right = 0;
var->transp.length = 8;
var->transp.offset = 24;
var->transp.msb_right = 0;
break;
}
var->height = -1;
var->width = -1;
var->grayscale = 0;
/* Copy nonstd field to/from sync for fbset usage */
var->sync |= var->nonstd;
var->nonstd |= var->sync;
adjust_aoi_size_position(var, info);
return 0;
}
static void set_fix(struct fb_info *info)
{
struct fb_fix_screeninfo *fix = &info->fix;
struct fb_var_screeninfo *var = &info->var;
struct mfb_info *mfbi = info->par;
strncpy(fix->id, mfbi->id, sizeof(fix->id));
fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
fix->type = FB_TYPE_PACKED_PIXELS;
fix->accel = FB_ACCEL_NONE;
fix->visual = FB_VISUAL_TRUECOLOR;
fix->xpanstep = 1;
fix->ypanstep = 1;
}
static void update_lcdc(struct fb_info *info)
{
struct fb_var_screeninfo *var = &info->var;
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
struct diu __iomem *hw;
int i, j;
u8 *gamma_table_base;
u32 temp;
hw = data->diu_reg;
if (diu_ops.set_monitor_port)
diu_ops.set_monitor_port(data->monitor_port);
gamma_table_base = data->gamma;
/* Prep for DIU init - gamma table, cursor table */
for (i = 0; i <= 2; i++)
for (j = 0; j <= 255; j++)
*gamma_table_base++ = j;
if (diu_ops.set_gamma_table)
diu_ops.set_gamma_table(data->monitor_port, data->gamma);
disable_lcdc(info);
/* Program DIU registers */
out_be32(&hw->gamma, DMA_ADDR(data, gamma));
out_be32(&hw->bgnd, 0x007F7F7F); /* Set background to grey */
out_be32(&hw->disp_size, (var->yres << 16) | var->xres);
/* Horizontal and vertical configuration register */
temp = var->left_margin << 22 | /* BP_H */
var->hsync_len << 11 | /* PW_H */
var->right_margin; /* FP_H */
out_be32(&hw->hsyn_para, temp);
temp = var->upper_margin << 22 | /* BP_V */
var->vsync_len << 11 | /* PW_V */
var->lower_margin; /* FP_V */
out_be32(&hw->vsyn_para, temp);
diu_ops.set_pixel_clock(var->pixclock);
#ifndef CONFIG_PPC_MPC512x
/*
* The PLUT register is defined differently on the MPC5121 than it
* is on other SOCs. Unfortunately, there's no documentation that
* explains how it's supposed to be programmed, so for now, we leave
* it at the default value on the MPC5121.
*
* For other SOCs, program it for the highest priority, which will
* reduce the chance of underrun. Technically, we should scale the
* priority to match the screen resolution, but doing that properly
* requires delicate fine-tuning for each use-case.
*/
out_be32(&hw->plut, 0x01F5F666);
#endif
/* Enable the DIU */
enable_lcdc(info);
}
static int map_video_memory(struct fb_info *info)
{
u32 smem_len = info->fix.line_length * info->var.yres_virtual;
void *p;
p = alloc_pages_exact(smem_len, GFP_DMA | __GFP_ZERO);
if (!p) {
dev_err(info->dev, "unable to allocate fb memory\n");
return -ENOMEM;
}
mutex_lock(&info->mm_lock);
info->screen_base = p;
info->fix.smem_start = virt_to_phys(info->screen_base);
info->fix.smem_len = smem_len;
mutex_unlock(&info->mm_lock);
info->screen_size = info->fix.smem_len;
return 0;
}
static void unmap_video_memory(struct fb_info *info)
{
void *p = info->screen_base;
size_t l = info->fix.smem_len;
mutex_lock(&info->mm_lock);
info->screen_base = NULL;
info->fix.smem_start = 0;
info->fix.smem_len = 0;
mutex_unlock(&info->mm_lock);
if (p)
free_pages_exact(p, l);
}
/*
* Using the fb_var_screeninfo in fb_info we set the aoi of this
* particular framebuffer. It is a light version of fsl_diu_set_par.
*/
static int fsl_diu_set_aoi(struct fb_info *info)
{
struct fb_var_screeninfo *var = &info->var;
struct mfb_info *mfbi = info->par;
struct diu_ad *ad = mfbi->ad;
/* AOI should not be greater than display size */
ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);
return 0;
}
/**
* fsl_diu_get_pixel_format: return the pixel format for a given color depth
*
* The pixel format is a 32-bit value that determine which bits in each
* pixel are to be used for each color. This is the default function used
* if the platform does not define its own version.
*/
static u32 fsl_diu_get_pixel_format(unsigned int bits_per_pixel)
{
#define PF_BYTE_F 0x10000000
#define PF_ALPHA_C_MASK 0x0E000000
#define PF_ALPHA_C_SHIFT 25
#define PF_BLUE_C_MASK 0x01800000
#define PF_BLUE_C_SHIFT 23
#define PF_GREEN_C_MASK 0x00600000
#define PF_GREEN_C_SHIFT 21
#define PF_RED_C_MASK 0x00180000
#define PF_RED_C_SHIFT 19
#define PF_PALETTE 0x00040000
#define PF_PIXEL_S_MASK 0x00030000
#define PF_PIXEL_S_SHIFT 16
#define PF_COMP_3_MASK 0x0000F000
#define PF_COMP_3_SHIFT 12
#define PF_COMP_2_MASK 0x00000F00
#define PF_COMP_2_SHIFT 8
#define PF_COMP_1_MASK 0x000000F0
#define PF_COMP_1_SHIFT 4
#define PF_COMP_0_MASK 0x0000000F
#define PF_COMP_0_SHIFT 0
#define MAKE_PF(alpha, red, green, blue, size, c0, c1, c2, c3) \
cpu_to_le32(PF_BYTE_F | (alpha << PF_ALPHA_C_SHIFT) | \
(blue << PF_BLUE_C_SHIFT) | (green << PF_GREEN_C_SHIFT) | \
(red << PF_RED_C_SHIFT) | (c3 << PF_COMP_3_SHIFT) | \
(c2 << PF_COMP_2_SHIFT) | (c1 << PF_COMP_1_SHIFT) | \
(c0 << PF_COMP_0_SHIFT) | (size << PF_PIXEL_S_SHIFT))
switch (bits_per_pixel) {
case 32:
/* 0x88883316 */
return MAKE_PF(3, 2, 1, 0, 3, 8, 8, 8, 8);
case 24:
/* 0x88082219 */
return MAKE_PF(4, 0, 1, 2, 2, 8, 8, 8, 0);
case 16:
/* 0x65053118 */
return MAKE_PF(4, 2, 1, 0, 1, 5, 6, 5, 0);
default:
pr_err("fsl-diu: unsupported color depth %u\n", bits_per_pixel);
return 0;
}
}
/*
* Copies a cursor image from user space to the proper place in driver
* memory so that the hardware can display the cursor image.
*
* Cursor data is represented as a sequence of 'width' bits packed into bytes.
* That is, the first 8 bits are in the first byte, the second 8 bits in the
* second byte, and so on. Therefore, the each row of the cursor is (width +
* 7) / 8 bytes of 'data'
*
* The DIU only supports cursors up to 32x32 (MAX_CURS). We reject cursors
* larger than this, so we already know that 'width' <= 32. Therefore, we can
* simplify our code by using a 32-bit big-endian integer ("line") to read in
* a single line of pixels, and only look at the top 'width' bits of that
* integer.
*
* This could result in an unaligned 32-bit read. For example, if the cursor
* is 24x24, then the first three bytes of 'image' contain the pixel data for
* the top line of the cursor. We do a 32-bit read of 'image', but we look
* only at the top 24 bits. Then we increment 'image' by 3 bytes. The next
* read is unaligned. The only problem is that we might read past the end of
* 'image' by 1-3 bytes, but that should not cause any problems.
*/
static void fsl_diu_load_cursor_image(struct fb_info *info,
const void *image, uint16_t bg, uint16_t fg,
unsigned int width, unsigned int height)
{
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
__le16 *cursor = data->cursor;
__le16 _fg = cpu_to_le16(fg);
__le16 _bg = cpu_to_le16(bg);
unsigned int h, w;
for (h = 0; h < height; h++) {
uint32_t mask = 1 << 31;
uint32_t line = be32_to_cpup(image);
for (w = 0; w < width; w++) {
cursor[w] = (line & mask) ? _fg : _bg;
mask >>= 1;
}
cursor += MAX_CURS;
image += DIV_ROUND_UP(width, 8);
}
}
/*
* Set a hardware cursor. The image data for the cursor is passed via the
* fb_cursor object.
*/
static int fsl_diu_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
struct diu __iomem *hw = data->diu_reg;
if (cursor->image.width > MAX_CURS || cursor->image.height > MAX_CURS)
return -EINVAL;
/* The cursor size has changed */
if (cursor->set & FB_CUR_SETSIZE) {
/*
* The DIU cursor is a fixed size, so when we get this
* message, instead of resizing the cursor, we just clear
* all the image data, in expectation of new data. However,
* in tests this control does not appear to be normally
* called.
*/
memset(data->cursor, 0, sizeof(data->cursor));
}
/* The cursor position has changed (cursor->image.dx|dy) */
if (cursor->set & FB_CUR_SETPOS) {
uint32_t xx, yy;
yy = (cursor->image.dy - info->var.yoffset) & 0x7ff;
xx = (cursor->image.dx - info->var.xoffset) & 0x7ff;
out_be32(&hw->curs_pos, yy << 16 | xx);
}
/*
* FB_CUR_SETIMAGE - the cursor image has changed
* FB_CUR_SETCMAP - the cursor colors has changed
* FB_CUR_SETSHAPE - the cursor bitmask has changed
*/
if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETCMAP | FB_CUR_SETIMAGE)) {
/*
* Determine the size of the cursor image data. Normally,
* it's 8x16.
*/
unsigned int image_size =
DIV_ROUND_UP(cursor->image.width, 8) *
cursor->image.height;
unsigned int image_words =
DIV_ROUND_UP(image_size, sizeof(uint32_t));
unsigned int bg_idx = cursor->image.bg_color;
unsigned int fg_idx = cursor->image.fg_color;
uint32_t *image, *source, *mask;
uint16_t fg, bg;
unsigned int i;
if (info->state != FBINFO_STATE_RUNNING)
return 0;
bg = ((info->cmap.red[bg_idx] & 0xf8) << 7) |
((info->cmap.green[bg_idx] & 0xf8) << 2) |
((info->cmap.blue[bg_idx] & 0xf8) >> 3) |
1 << 15;
fg = ((info->cmap.red[fg_idx] & 0xf8) << 7) |
((info->cmap.green[fg_idx] & 0xf8) << 2) |
((info->cmap.blue[fg_idx] & 0xf8) >> 3) |
1 << 15;
/* Use 32-bit operations on the data to improve performance */
image = (uint32_t *)data->next_cursor;
source = (uint32_t *)cursor->image.data;
mask = (uint32_t *)cursor->mask;
if (cursor->rop == ROP_XOR)
for (i = 0; i < image_words; i++)
image[i] = source[i] ^ mask[i];
else
for (i = 0; i < image_words; i++)
image[i] = source[i] & mask[i];
fsl_diu_load_cursor_image(info, image, bg, fg,
cursor->image.width, cursor->image.height);
}
/*
* Show or hide the cursor. The cursor data is always stored in the
* 'cursor' memory block, and the actual cursor position is always in
* the DIU's CURS_POS register. To hide the cursor, we redirect the
* CURSOR register to a blank cursor. The show the cursor, we
* redirect the CURSOR register to the real cursor data.
*/
if (cursor->enable)
out_be32(&hw->cursor, DMA_ADDR(data, cursor));
else
out_be32(&hw->cursor, DMA_ADDR(data, blank_cursor));
return 0;
}
/*
* Using the fb_var_screeninfo in fb_info we set the resolution of this
* particular framebuffer. This function alters the fb_fix_screeninfo stored
* in fb_info. It does not alter var in fb_info since we are using that
* data. This means we depend on the data in var inside fb_info to be
* supported by the hardware. fsl_diu_check_var is always called before
* fsl_diu_set_par to ensure this.
*/
static int fsl_diu_set_par(struct fb_info *info)
{
unsigned long len;
struct fb_var_screeninfo *var = &info->var;
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
struct diu_ad *ad = mfbi->ad;
struct diu __iomem *hw;
hw = data->diu_reg;
set_fix(info);
len = info->var.yres_virtual * info->fix.line_length;
/* Alloc & dealloc each time resolution/bpp change */
if (len != info->fix.smem_len) {
if (info->fix.smem_start)
unmap_video_memory(info);
/* Memory allocation for framebuffer */
if (map_video_memory(info)) {
dev_err(info->dev, "unable to allocate fb memory 1\n");
return -ENOMEM;
}
}
if (diu_ops.get_pixel_format)
ad->pix_fmt = diu_ops.get_pixel_format(data->monitor_port,
var->bits_per_pixel);
else
ad->pix_fmt = fsl_diu_get_pixel_format(var->bits_per_pixel);
ad->addr = cpu_to_le32(info->fix.smem_start);
ad->src_size_g_alpha = cpu_to_le32((var->yres_virtual << 12) |
var->xres_virtual) | mfbi->g_alpha;
/* AOI should not be greater than display size */
ad->aoi_size = cpu_to_le32((var->yres << 16) | var->xres);
ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);
/* Disable chroma keying function */
ad->ckmax_r = 0;
ad->ckmax_g = 0;
ad->ckmax_b = 0;
ad->ckmin_r = 255;
ad->ckmin_g = 255;
ad->ckmin_b = 255;
if (mfbi->index == PLANE0)
update_lcdc(info);
return 0;
}
static inline __u32 CNVT_TOHW(__u32 val, __u32 width)
{
return ((val << width) + 0x7FFF - val) >> 16;
}
/*
* Set a single color register. The values supplied have a 16 bit magnitude
* which needs to be scaled in this function for the hardware. Things to take
* into consideration are how many color registers, if any, are supported with
* the current color visual. With truecolor mode no color palettes are
* supported. Here a pseudo palette is created which we store the value in
* pseudo_palette in struct fb_info. For pseudocolor mode we have a limited
* color palette.
*/
static int fsl_diu_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info)
{
int ret = 1;
/*
* If greyscale is true, then we convert the RGB value
* to greyscale no matter what visual we are using.
*/
if (info->var.grayscale)
red = green = blue = (19595 * red + 38470 * green +
7471 * blue) >> 16;
switch (info->fix.visual) {
case FB_VISUAL_TRUECOLOR:
/*
* 16-bit True Colour. We encode the RGB value
* according to the RGB bitfield information.
*/
if (regno < 16) {
u32 *pal = info->pseudo_palette;
u32 v;
red = CNVT_TOHW(red, info->var.red.length);
green = CNVT_TOHW(green, info->var.green.length);
blue = CNVT_TOHW(blue, info->var.blue.length);
transp = CNVT_TOHW(transp, info->var.transp.length);
v = (red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset) |
(transp << info->var.transp.offset);
pal[regno] = v;
ret = 0;
}
break;
}
return ret;
}
/*
* Pan (or wrap, depending on the `vmode' field) the display using the
* 'xoffset' and 'yoffset' fields of the 'var' structure. If the values
* don't fit, return -EINVAL.
*/
static int fsl_diu_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
if ((info->var.xoffset == var->xoffset) &&
(info->var.yoffset == var->yoffset))
return 0; /* No change, do nothing */
if (var->xoffset + info->var.xres > info->var.xres_virtual
|| var->yoffset + info->var.yres > info->var.yres_virtual)
return -EINVAL;
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
if (var->vmode & FB_VMODE_YWRAP)
info->var.vmode |= FB_VMODE_YWRAP;
else
info->var.vmode &= ~FB_VMODE_YWRAP;
fsl_diu_set_aoi(info);
return 0;
}
static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct mfb_info *mfbi = info->par;
struct diu_ad *ad = mfbi->ad;
struct mfb_chroma_key ck;
unsigned char global_alpha;
struct aoi_display_offset aoi_d;
__u32 pix_fmt;
void __user *buf = (void __user *)arg;
if (!arg)
return -EINVAL;
dev_dbg(info->dev, "ioctl %08x (dir=%s%s type=%u nr=%u size=%u)\n", cmd,
_IOC_DIR(cmd) & _IOC_READ ? "R" : "",
_IOC_DIR(cmd) & _IOC_WRITE ? "W" : "",
_IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
switch (cmd) {
case MFB_SET_PIXFMT_OLD:
dev_warn(info->dev,
"MFB_SET_PIXFMT value of 0x%08x is deprecated.\n",
MFB_SET_PIXFMT_OLD);
case MFB_SET_PIXFMT:
if (copy_from_user(&pix_fmt, buf, sizeof(pix_fmt)))
return -EFAULT;
ad->pix_fmt = pix_fmt;
break;
case MFB_GET_PIXFMT_OLD:
dev_warn(info->dev,
"MFB_GET_PIXFMT value of 0x%08x is deprecated.\n",
MFB_GET_PIXFMT_OLD);
case MFB_GET_PIXFMT:
pix_fmt = ad->pix_fmt;
if (copy_to_user(buf, &pix_fmt, sizeof(pix_fmt)))
return -EFAULT;
break;
case MFB_SET_AOID:
if (copy_from_user(&aoi_d, buf, sizeof(aoi_d)))
return -EFAULT;
mfbi->x_aoi_d = aoi_d.x_aoi_d;
mfbi->y_aoi_d = aoi_d.y_aoi_d;
fsl_diu_check_var(&info->var, info);
fsl_diu_set_aoi(info);
break;
case MFB_GET_AOID:
aoi_d.x_aoi_d = mfbi->x_aoi_d;
aoi_d.y_aoi_d = mfbi->y_aoi_d;
if (copy_to_user(buf, &aoi_d, sizeof(aoi_d)))
return -EFAULT;
break;
case MFB_GET_ALPHA:
global_alpha = mfbi->g_alpha;
if (copy_to_user(buf, &global_alpha, sizeof(global_alpha)))
return -EFAULT;
break;
case MFB_SET_ALPHA:
/* set panel information */
if (copy_from_user(&global_alpha, buf, sizeof(global_alpha)))
return -EFAULT;
ad->src_size_g_alpha = (ad->src_size_g_alpha & (~0xff)) |
(global_alpha & 0xff);
mfbi->g_alpha = global_alpha;
break;
case MFB_SET_CHROMA_KEY:
/* set panel winformation */
if (copy_from_user(&ck, buf, sizeof(ck)))
return -EFAULT;
if (ck.enable &&
(ck.red_max < ck.red_min ||
ck.green_max < ck.green_min ||
ck.blue_max < ck.blue_min))
return -EINVAL;
if (!ck.enable) {
ad->ckmax_r = 0;
ad->ckmax_g = 0;
ad->ckmax_b = 0;
ad->ckmin_r = 255;
ad->ckmin_g = 255;
ad->ckmin_b = 255;
} else {
ad->ckmax_r = ck.red_max;
ad->ckmax_g = ck.green_max;
ad->ckmax_b = ck.blue_max;
ad->ckmin_r = ck.red_min;
ad->ckmin_g = ck.green_min;
ad->ckmin_b = ck.blue_min;
}
break;
#ifdef CONFIG_PPC_MPC512x
case MFB_SET_GAMMA: {
struct fsl_diu_data *data = mfbi->parent;
if (copy_from_user(data->gamma, buf, sizeof(data->gamma)))
return -EFAULT;
setbits32(&data->diu_reg->gamma, 0); /* Force table reload */
break;
}
case MFB_GET_GAMMA: {
struct fsl_diu_data *data = mfbi->parent;
if (copy_to_user(buf, data->gamma, sizeof(data->gamma)))
return -EFAULT;
break;
}
#endif
default:
dev_err(info->dev, "unknown ioctl command (0x%08X)\n", cmd);
return -ENOIOCTLCMD;
}
return 0;
}
static inline void fsl_diu_enable_interrupts(struct fsl_diu_data *data)
{
u32 int_mask = INT_UNDRUN; /* enable underrun detection */
if (IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
int_mask |= INT_VSYNC; /* enable vertical sync */
clrbits32(&data->diu_reg->int_mask, int_mask);
}
/* turn on fb if count == 1
*/
static int fsl_diu_open(struct fb_info *info, int user)
{
struct mfb_info *mfbi = info->par;
int res = 0;
/* free boot splash memory on first /dev/fb0 open */
if ((mfbi->index == PLANE0) && diu_ops.release_bootmem)
diu_ops.release_bootmem();
spin_lock(&diu_lock);
mfbi->count++;
if (mfbi->count == 1) {
fsl_diu_check_var(&info->var, info);
res = fsl_diu_set_par(info);
if (res < 0)
mfbi->count--;
else {
fsl_diu_enable_interrupts(mfbi->parent);
fsl_diu_enable_panel(info);
}
}
spin_unlock(&diu_lock);
return res;
}
/* turn off fb if count == 0
*/
static int fsl_diu_release(struct fb_info *info, int user)
{
struct mfb_info *mfbi = info->par;
int res = 0;
spin_lock(&diu_lock);
mfbi->count--;
if (mfbi->count == 0) {
struct fsl_diu_data *data = mfbi->parent;
bool disable = true;
int i;
/* Disable interrupts only if all AOIs are closed */
for (i = 0; i < NUM_AOIS; i++) {
struct mfb_info *mi = data->fsl_diu_info[i].par;
if (mi->count)
disable = false;
}
if (disable)
out_be32(&data->diu_reg->int_mask, 0xffffffff);
fsl_diu_disable_panel(info);
}
spin_unlock(&diu_lock);
return res;
}
static struct fb_ops fsl_diu_ops = {
.owner = THIS_MODULE,
.fb_check_var = fsl_diu_check_var,
.fb_set_par = fsl_diu_set_par,
.fb_setcolreg = fsl_diu_setcolreg,
.fb_pan_display = fsl_diu_pan_display,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_ioctl = fsl_diu_ioctl,
.fb_open = fsl_diu_open,
.fb_release = fsl_diu_release,
.fb_cursor = fsl_diu_cursor,
};
static int install_fb(struct fb_info *info)
{
int rc;
struct mfb_info *mfbi = info->par;
struct fsl_diu_data *data = mfbi->parent;
const char *aoi_mode, *init_aoi_mode = "320x240";
struct fb_videomode *db = fsl_diu_mode_db;
unsigned int dbsize = ARRAY_SIZE(fsl_diu_mode_db);
int has_default_mode = 1;
info->var.activate = FB_ACTIVATE_NOW;
info->fbops = &fsl_diu_ops;
info->flags = FBINFO_DEFAULT | FBINFO_VIRTFB | FBINFO_PARTIAL_PAN_OK |
FBINFO_READS_FAST;
info->pseudo_palette = mfbi->pseudo_palette;
rc = fb_alloc_cmap(&info->cmap, 16, 0);
if (rc)
return rc;
if (mfbi->index == PLANE0) {
if (data->has_edid) {
/* Now build modedb from EDID */
fb_edid_to_monspecs(data->edid_data, &info->monspecs);
fb_videomode_to_modelist(info->monspecs.modedb,
info->monspecs.modedb_len,
&info->modelist);
db = info->monspecs.modedb;
dbsize = info->monspecs.modedb_len;
}
aoi_mode = fb_mode;
} else {
aoi_mode = init_aoi_mode;
}
rc = fb_find_mode(&info->var, info, aoi_mode, db, dbsize, NULL,
default_bpp);
if (!rc) {
/*
* For plane 0 we continue and look into
* driver's internal modedb.
*/
if ((mfbi->index == PLANE0) && data->has_edid)
has_default_mode = 0;
else
return -EINVAL;
}
if (!has_default_mode) {
rc = fb_find_mode(&info->var, info, aoi_mode, fsl_diu_mode_db,
ARRAY_SIZE(fsl_diu_mode_db), NULL, default_bpp);
if (rc)
has_default_mode = 1;
}
/* Still not found, use preferred mode from database if any */
if (!has_default_mode && info->monspecs.modedb) {
struct fb_monspecs *specs = &info->monspecs;
struct fb_videomode *modedb = &specs->modedb[0];
/*
* Get preferred timing. If not found,
* first mode in database will be used.
*/
if (specs->misc & FB_MISC_1ST_DETAIL) {
int i;
for (i = 0; i < specs->modedb_len; i++) {
if (specs->modedb[i].flag & FB_MODE_IS_FIRST) {
modedb = &specs->modedb[i];
break;
}
}
}
info->var.bits_per_pixel = default_bpp;
fb_videomode_to_var(&info->var, modedb);
}
if (fsl_diu_check_var(&info->var, info)) {
dev_err(info->dev, "fsl_diu_check_var failed\n");
unmap_video_memory(info);
fb_dealloc_cmap(&info->cmap);
return -EINVAL;
}
if (register_framebuffer(info) < 0) {
dev_err(info->dev, "register_framebuffer failed\n");
unmap_video_memory(info);
fb_dealloc_cmap(&info->cmap);
return -EINVAL;
}
mfbi->registered = 1;
dev_info(info->dev, "%s registered successfully\n", mfbi->id);
return 0;
}
static void uninstall_fb(struct fb_info *info)
{
struct mfb_info *mfbi = info->par;
if (!mfbi->registered)
return;
unregister_framebuffer(info);
unmap_video_memory(info);
if (&info->cmap)
fb_dealloc_cmap(&info->cmap);
mfbi->registered = 0;
}
static irqreturn_t fsl_diu_isr(int irq, void *dev_id)
{
struct diu __iomem *hw = dev_id;
uint32_t status = in_be32(&hw->int_status);
if (status) {
/* This is the workaround for underrun */
if (status & INT_UNDRUN) {
out_be32(&hw->diu_mode, 0);
udelay(1);
out_be32(&hw->diu_mode, 1);
}
#if defined(CONFIG_NOT_COHERENT_CACHE)
else if (status & INT_VSYNC) {
unsigned int i;
for (i = 0; i < coherence_data_size;
i += d_cache_line_size)
__asm__ __volatile__ (
"dcbz 0, %[input]"
::[input]"r"(&coherence_data[i]));
}
#endif
return IRQ_HANDLED;
}
return IRQ_NONE;
}
#ifdef CONFIG_PM
/*
* Power management hooks. Note that we won't be called from IRQ context,
* unlike the blank functions above, so we may sleep.
*/
static int fsl_diu_suspend(struct platform_device *ofdev, pm_message_t state)
{
struct fsl_diu_data *data;
data = dev_get_drvdata(&ofdev->dev);
disable_lcdc(data->fsl_diu_info);
return 0;
}
static int fsl_diu_resume(struct platform_device *ofdev)
{
struct fsl_diu_data *data;
unsigned int i;
data = dev_get_drvdata(&ofdev->dev);
fsl_diu_enable_interrupts(data);
update_lcdc(data->fsl_diu_info);
for (i = 0; i < NUM_AOIS; i++) {
if (data->mfb[i].count)
fsl_diu_enable_panel(&data->fsl_diu_info[i]);
}
return 0;
}
#else
#define fsl_diu_suspend NULL
#define fsl_diu_resume NULL
#endif /* CONFIG_PM */
static ssize_t store_monitor(struct device *device,
struct device_attribute *attr, const char *buf, size_t count)
{
enum fsl_diu_monitor_port old_monitor_port;
struct fsl_diu_data *data =
container_of(attr, struct fsl_diu_data, dev_attr);
old_monitor_port = data->monitor_port;
data->monitor_port = fsl_diu_name_to_port(buf);
if (old_monitor_port != data->monitor_port) {
/* All AOIs need adjust pixel format
* fsl_diu_set_par only change the pixsel format here
* unlikely to fail. */
unsigned int i;
for (i=0; i < NUM_AOIS; i++)
fsl_diu_set_par(&data->fsl_diu_info[i]);
}
return count;
}
static ssize_t show_monitor(struct device *device,
struct device_attribute *attr, char *buf)
{
struct fsl_diu_data *data =
container_of(attr, struct fsl_diu_data, dev_attr);
switch (data->monitor_port) {
case FSL_DIU_PORT_DVI:
return sprintf(buf, "DVI\n");
case FSL_DIU_PORT_LVDS:
return sprintf(buf, "Single-link LVDS\n");
case FSL_DIU_PORT_DLVDS:
return sprintf(buf, "Dual-link LVDS\n");
}
return 0;
}
static int fsl_diu_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct mfb_info *mfbi;
struct fsl_diu_data *data;
dma_addr_t dma_addr; /* DMA addr of fsl_diu_data struct */
const void *prop;
unsigned int i;
int ret;
data = dmam_alloc_coherent(&pdev->dev, sizeof(struct fsl_diu_data),
&dma_addr, GFP_DMA | __GFP_ZERO);
if (!data)
return -ENOMEM;
data->dma_addr = dma_addr;
/*
* dma_alloc_coherent() uses a page allocator, so the address is
* always page-aligned. We need the memory to be 32-byte aligned,
* so that's good. However, if one day the allocator changes, we
* need to catch that. It's not worth the effort to handle unaligned
* alloctions now because it's highly unlikely to ever be a problem.
*/
if ((unsigned long)data & 31) {
dev_err(&pdev->dev, "misaligned allocation");
ret = -ENOMEM;
goto error;
}
spin_lock_init(&data->reg_lock);
for (i = 0; i < NUM_AOIS; i++) {
struct fb_info *info = &data->fsl_diu_info[i];
info->device = &pdev->dev;
info->par = &data->mfb[i];
/*
* We store the physical address of the AD in the reserved
* 'paddr' field of the AD itself.
*/
data->ad[i].paddr = DMA_ADDR(data, ad[i]);
info->fix.smem_start = 0;
/* Initialize the AOI data structure */
mfbi = info->par;
memcpy(mfbi, &mfb_template[i], sizeof(struct mfb_info));
mfbi->parent = data;
mfbi->ad = &data->ad[i];
}
/* Get the EDID data from the device tree, if present */
prop = of_get_property(np, "edid", &ret);
if (prop && ret == EDID_LENGTH) {
memcpy(data->edid_data, prop, EDID_LENGTH);
data->has_edid = true;
}
data->diu_reg = of_iomap(np, 0);
if (!data->diu_reg) {
dev_err(&pdev->dev, "cannot map DIU registers\n");
ret = -EFAULT;
goto error;
}
/* Get the IRQ of the DIU */
data->irq = irq_of_parse_and_map(np, 0);
if (!data->irq) {
dev_err(&pdev->dev, "could not get DIU IRQ\n");
ret = -EINVAL;
goto error;
}
data->monitor_port = monitor_port;
/* Initialize the dummy Area Descriptor */
data->dummy_ad.addr = cpu_to_le32(DMA_ADDR(data, dummy_aoi));
data->dummy_ad.pix_fmt = 0x88882317;
data->dummy_ad.src_size_g_alpha = cpu_to_le32((4 << 12) | 4);
data->dummy_ad.aoi_size = cpu_to_le32((4 << 16) | 2);
data->dummy_ad.offset_xyi = 0;
data->dummy_ad.offset_xyd = 0;
data->dummy_ad.next_ad = 0;
data->dummy_ad.paddr = DMA_ADDR(data, dummy_ad);
/*
* Let DIU continue to display splash screen if it was pre-initialized
* by the bootloader; otherwise, clear the display.
*/
if (in_be32(&data->diu_reg->diu_mode) == MFB_MODE0)
out_be32(&data->diu_reg->desc[0], 0);
out_be32(&data->diu_reg->desc[1], data->dummy_ad.paddr);
out_be32(&data->diu_reg->desc[2], data->dummy_ad.paddr);
/*
* Older versions of U-Boot leave interrupts enabled, so disable
* all of them and clear the status register.
*/
out_be32(&data->diu_reg->int_mask, 0xffffffff);
in_be32(&data->diu_reg->int_status);
ret = request_irq(data->irq, fsl_diu_isr, 0, "fsl-diu-fb",
data->diu_reg);
if (ret) {
dev_err(&pdev->dev, "could not claim irq\n");
goto error;
}
for (i = 0; i < NUM_AOIS; i++) {
ret = install_fb(&data->fsl_diu_info[i]);
if (ret) {
dev_err(&pdev->dev, "could not register fb %d\n", i);
free_irq(data->irq, data->diu_reg);
goto error;
}
}
sysfs_attr_init(&data->dev_attr.attr);
data->dev_attr.attr.name = "monitor";
data->dev_attr.attr.mode = S_IRUGO|S_IWUSR;
data->dev_attr.show = show_monitor;
data->dev_attr.store = store_monitor;
ret = device_create_file(&pdev->dev, &data->dev_attr);
if (ret) {
dev_err(&pdev->dev, "could not create sysfs file %s\n",
data->dev_attr.attr.name);
}
dev_set_drvdata(&pdev->dev, data);
return 0;
error:
for (i = 0; i < NUM_AOIS; i++)
uninstall_fb(&data->fsl_diu_info[i]);
iounmap(data->diu_reg);
return ret;
}
static int fsl_diu_remove(struct platform_device *pdev)
{
struct fsl_diu_data *data;
int i;
data = dev_get_drvdata(&pdev->dev);
disable_lcdc(&data->fsl_diu_info[0]);
free_irq(data->irq, data->diu_reg);
for (i = 0; i < NUM_AOIS; i++)
uninstall_fb(&data->fsl_diu_info[i]);
iounmap(data->diu_reg);
return 0;
}
#ifndef MODULE
static int __init fsl_diu_setup(char *options)
{
char *opt;
unsigned long val;
if (!options || !*options)
return 0;
while ((opt = strsep(&options, ",")) != NULL) {
if (!*opt)
continue;
if (!strncmp(opt, "monitor=", 8)) {
monitor_port = fsl_diu_name_to_port(opt + 8);
} else if (!strncmp(opt, "bpp=", 4)) {
if (!kstrtoul(opt + 4, 10, &val))
default_bpp = val;
} else
fb_mode = opt;
}
return 0;
}
#endif
static const struct of_device_id fsl_diu_match[] = {
#ifdef CONFIG_PPC_MPC512x
{
.compatible = "fsl,mpc5121-diu",
},
#endif
{
.compatible = "fsl,diu",
},
{}
};
MODULE_DEVICE_TABLE(of, fsl_diu_match);
static struct platform_driver fsl_diu_driver = {
.driver = {
.name = "fsl-diu-fb",
.of_match_table = fsl_diu_match,
},
.probe = fsl_diu_probe,
.remove = fsl_diu_remove,
.suspend = fsl_diu_suspend,
.resume = fsl_diu_resume,
};
static int __init fsl_diu_init(void)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
struct device_node *np;
const u32 *prop;
#endif
int ret;
#ifndef MODULE
char *option;
/*
* For kernel boot options (in 'video=xxxfb:<options>' format)
*/
if (fb_get_options("fslfb", &option))
return -ENODEV;
fsl_diu_setup(option);
#else
monitor_port = fsl_diu_name_to_port(monitor_string);
#endif
/*
* Must to verify set_pixel_clock. If not implement on platform,
* then that means that there is no platform support for the DIU.
*/
if (!diu_ops.set_pixel_clock)
return -ENODEV;
pr_info("Freescale Display Interface Unit (DIU) framebuffer driver\n");
#ifdef CONFIG_NOT_COHERENT_CACHE
np = of_find_node_by_type(NULL, "cpu");
if (!np) {
pr_err("fsl-diu-fb: can't find 'cpu' device node\n");
return -ENODEV;
}
prop = of_get_property(np, "d-cache-size", NULL);
if (prop == NULL) {
pr_err("fsl-diu-fb: missing 'd-cache-size' property' "
"in 'cpu' node\n");
of_node_put(np);
return -ENODEV;
}
/*
* Freescale PLRU requires 13/8 times the cache size to do a proper
* displacement flush
*/
coherence_data_size = be32_to_cpup(prop) * 13;
coherence_data_size /= 8;
pr_debug("fsl-diu-fb: coherence data size is %zu bytes\n",
coherence_data_size);
prop = of_get_property(np, "d-cache-line-size", NULL);
if (prop == NULL) {
pr_err("fsl-diu-fb: missing 'd-cache-line-size' property' "
"in 'cpu' node\n");
of_node_put(np);
return -ENODEV;
}
d_cache_line_size = be32_to_cpup(prop);
pr_debug("fsl-diu-fb: cache lines size is %u bytes\n",
d_cache_line_size);
of_node_put(np);
coherence_data = vmalloc(coherence_data_size);
if (!coherence_data)
return -ENOMEM;
#endif
ret = platform_driver_register(&fsl_diu_driver);
if (ret) {
pr_err("fsl-diu-fb: failed to register platform driver\n");
#if defined(CONFIG_NOT_COHERENT_CACHE)
vfree(coherence_data);
#endif
}
return ret;
}
static void __exit fsl_diu_exit(void)
{
platform_driver_unregister(&fsl_diu_driver);
#if defined(CONFIG_NOT_COHERENT_CACHE)
vfree(coherence_data);
#endif
}
module_init(fsl_diu_init);
module_exit(fsl_diu_exit);
MODULE_AUTHOR("York Sun <yorksun@freescale.com>");
MODULE_DESCRIPTION("Freescale DIU framebuffer driver");
MODULE_LICENSE("GPL");
module_param_named(mode, fb_mode, charp, 0);
MODULE_PARM_DESC(mode,
"Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
module_param_named(bpp, default_bpp, ulong, 0);
MODULE_PARM_DESC(bpp, "Specify bit-per-pixel if not specified in 'mode'");
module_param_named(monitor, monitor_string, charp, 0);
MODULE_PARM_DESC(monitor, "Specify the monitor port "
"(\"dvi\", \"lvds\", or \"dlvds\") if supported by the platform");
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