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linux/drivers/video/smscufx.c
Tomi Valkeinen 04f8afbec3 fbdev: improve fb_mmap bounds checks 
Improve fb_mmap bounds checks in gbefb, smscufx, udlfb and vfb drivers to
prevent possible uint overflows.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Steve Glendinning <steve.glendinning@smsc.com>
Cc: Bernie Thompson <bernie@plugable.com>
2013-04-26 08:28:56 +03:00

1981 lines
54 KiB
C
Raw Blame History

/*
* smscufx.c -- Framebuffer driver for SMSC UFX USB controller
*
* Copyright (C) 2011 Steve Glendinning <steve.glendinning@shawell.net>
* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License v2. See the file COPYING in the main directory of this archive for
* more details.
*
* Based on udlfb, with work from Florian Echtler, Henrik Bjerregaard Pedersen,
* and others.
*
* Works well with Bernie Thompson's X DAMAGE patch to xf86-video-fbdev
* available from http://git.plugable.com
*
* Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
* usb-skeleton by GregKH.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/usb.h>
#include <linux/uaccess.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "edid.h"
#define check_warn(status, fmt, args...) \
({ if (status < 0) pr_warn(fmt, ##args); })
#define check_warn_return(status, fmt, args...) \
({ if (status < 0) { pr_warn(fmt, ##args); return status; } })
#define check_warn_goto_error(status, fmt, args...) \
({ if (status < 0) { pr_warn(fmt, ##args); goto error; } })
#define all_bits_set(x, bits) (((x) & (bits)) == (bits))
#define USB_VENDOR_REQUEST_WRITE_REGISTER 0xA0
#define USB_VENDOR_REQUEST_READ_REGISTER 0xA1
/*
* TODO: Propose standard fb.h ioctl for reporting damage,
* using _IOWR() and one of the existing area structs from fb.h
* Consider these ioctls deprecated, but they're still used by the
* DisplayLink X server as yet - need both to be modified in tandem
* when new ioctl(s) are ready.
*/
#define UFX_IOCTL_RETURN_EDID (0xAD)
#define UFX_IOCTL_REPORT_DAMAGE (0xAA)
/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
#define BULK_SIZE (512)
#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
#define WRITES_IN_FLIGHT (4)
#define GET_URB_TIMEOUT (HZ)
#define FREE_URB_TIMEOUT (HZ*2)
#define BPP 2
#define UFX_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */
#define UFX_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
struct dloarea {
int x, y;
int w, h;
};
struct urb_node {
struct list_head entry;
struct ufx_data *dev;
struct delayed_work release_urb_work;
struct urb *urb;
};
struct urb_list {
struct list_head list;
spinlock_t lock;
struct semaphore limit_sem;
int available;
int count;
size_t size;
};
struct ufx_data {
struct usb_device *udev;
struct device *gdev; /* &udev->dev */
struct fb_info *info;
struct urb_list urbs;
struct kref kref;
int fb_count;
bool virtualized; /* true when physical usb device not present */
struct delayed_work free_framebuffer_work;
atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
u8 *edid; /* null until we read edid from hw or get from sysfs */
size_t edid_size;
u32 pseudo_palette[256];
};
static struct fb_fix_screeninfo ufx_fix = {
.id = "smscufx",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_TRUECOLOR,
.xpanstep = 0,
.ypanstep = 0,
.ywrapstep = 0,
.accel = FB_ACCEL_NONE,
};
static const u32 smscufx_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
FBINFO_VIRTFB | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
static struct usb_device_id id_table[] = {
{USB_DEVICE(0x0424, 0x9d00),},
{USB_DEVICE(0x0424, 0x9d01),},
{},
};
MODULE_DEVICE_TABLE(usb, id_table);
/* module options */
static bool console; /* Optionally allow fbcon to consume first framebuffer */
static bool fb_defio = true; /* Optionally enable fb_defio mmap support */
/* ufx keeps a list of urbs for efficient bulk transfers */
static void ufx_urb_completion(struct urb *urb);
static struct urb *ufx_get_urb(struct ufx_data *dev);
static int ufx_submit_urb(struct ufx_data *dev, struct urb * urb, size_t len);
static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size);
static void ufx_free_urb_list(struct ufx_data *dev);
/* reads a control register */
static int ufx_reg_read(struct ufx_data *dev, u32 index, u32 *data)
{
u32 *buf = kmalloc(4, GFP_KERNEL);
int ret;
BUG_ON(!dev);
if (!buf)
return -ENOMEM;
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
USB_VENDOR_REQUEST_READ_REGISTER,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
le32_to_cpus(buf);
*data = *buf;
kfree(buf);
if (unlikely(ret < 0))
pr_warn("Failed to read register index 0x%08x\n", index);
return ret;
}
/* writes a control register */
static int ufx_reg_write(struct ufx_data *dev, u32 index, u32 data)
{
u32 *buf = kmalloc(4, GFP_KERNEL);
int ret;
BUG_ON(!dev);
if (!buf)
return -ENOMEM;
*buf = data;
cpu_to_le32s(buf);
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
USB_VENDOR_REQUEST_WRITE_REGISTER,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
kfree(buf);
if (unlikely(ret < 0))
pr_warn("Failed to write register index 0x%08x with value "
"0x%08x\n", index, data);
return ret;
}
static int ufx_reg_clear_and_set_bits(struct ufx_data *dev, u32 index,
u32 bits_to_clear, u32 bits_to_set)
{
u32 data;
int status = ufx_reg_read(dev, index, &data);
check_warn_return(status, "ufx_reg_clear_and_set_bits error reading "
"0x%x", index);
data &= (~bits_to_clear);
data |= bits_to_set;
status = ufx_reg_write(dev, index, data);
check_warn_return(status, "ufx_reg_clear_and_set_bits error writing "
"0x%x", index);
return 0;
}
static int ufx_reg_set_bits(struct ufx_data *dev, u32 index, u32 bits)
{
return ufx_reg_clear_and_set_bits(dev, index, 0, bits);
}
static int ufx_reg_clear_bits(struct ufx_data *dev, u32 index, u32 bits)
{
return ufx_reg_clear_and_set_bits(dev, index, bits, 0);
}
static int ufx_lite_reset(struct ufx_data *dev)
{
int status;
u32 value;
status = ufx_reg_write(dev, 0x3008, 0x00000001);
check_warn_return(status, "ufx_lite_reset error writing 0x3008");
status = ufx_reg_read(dev, 0x3008, &value);
check_warn_return(status, "ufx_lite_reset error reading 0x3008");
return (value == 0) ? 0 : -EIO;
}
/* If display is unblanked, then blank it */
static int ufx_blank(struct ufx_data *dev, bool wait)
{
u32 dc_ctrl, dc_sts;
int i;
int status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_blank error reading 0x2004");
status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
check_warn_return(status, "ufx_blank error reading 0x2000");
/* return success if display is already blanked */
if ((dc_sts & 0x00000100) || (dc_ctrl & 0x00000100))
return 0;
/* request the DC to blank the display */
dc_ctrl |= 0x00000100;
status = ufx_reg_write(dev, 0x2000, dc_ctrl);
check_warn_return(status, "ufx_blank error writing 0x2000");
/* return success immediately if we don't have to wait */
if (!wait)
return 0;
for (i = 0; i < 250; i++) {
status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_blank error reading 0x2004");
if (dc_sts & 0x00000100)
return 0;
}
/* timed out waiting for display to blank */
return -EIO;
}
/* If display is blanked, then unblank it */
static int ufx_unblank(struct ufx_data *dev, bool wait)
{
u32 dc_ctrl, dc_sts;
int i;
int status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_unblank error reading 0x2004");
status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
check_warn_return(status, "ufx_unblank error reading 0x2000");
/* return success if display is already unblanked */
if (((dc_sts & 0x00000100) == 0) || ((dc_ctrl & 0x00000100) == 0))
return 0;
/* request the DC to unblank the display */
dc_ctrl &= ~0x00000100;
status = ufx_reg_write(dev, 0x2000, dc_ctrl);
check_warn_return(status, "ufx_unblank error writing 0x2000");
/* return success immediately if we don't have to wait */
if (!wait)
return 0;
for (i = 0; i < 250; i++) {
status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_unblank error reading 0x2004");
if ((dc_sts & 0x00000100) == 0)
return 0;
}
/* timed out waiting for display to unblank */
return -EIO;
}
/* If display is enabled, then disable it */
static int ufx_disable(struct ufx_data *dev, bool wait)
{
u32 dc_ctrl, dc_sts;
int i;
int status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_disable error reading 0x2004");
status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
check_warn_return(status, "ufx_disable error reading 0x2000");
/* return success if display is already disabled */
if (((dc_sts & 0x00000001) == 0) || ((dc_ctrl & 0x00000001) == 0))
return 0;
/* request the DC to disable the display */
dc_ctrl &= ~(0x00000001);
status = ufx_reg_write(dev, 0x2000, dc_ctrl);
check_warn_return(status, "ufx_disable error writing 0x2000");
/* return success immediately if we don't have to wait */
if (!wait)
return 0;
for (i = 0; i < 250; i++) {
status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_disable error reading 0x2004");
if ((dc_sts & 0x00000001) == 0)
return 0;
}
/* timed out waiting for display to disable */
return -EIO;
}
/* If display is disabled, then enable it */
static int ufx_enable(struct ufx_data *dev, bool wait)
{
u32 dc_ctrl, dc_sts;
int i;
int status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_enable error reading 0x2004");
status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
check_warn_return(status, "ufx_enable error reading 0x2000");
/* return success if display is already enabled */
if ((dc_sts & 0x00000001) || (dc_ctrl & 0x00000001))
return 0;
/* request the DC to enable the display */
dc_ctrl |= 0x00000001;
status = ufx_reg_write(dev, 0x2000, dc_ctrl);
check_warn_return(status, "ufx_enable error writing 0x2000");
/* return success immediately if we don't have to wait */
if (!wait)
return 0;
for (i = 0; i < 250; i++) {
status = ufx_reg_read(dev, 0x2004, &dc_sts);
check_warn_return(status, "ufx_enable error reading 0x2004");
if (dc_sts & 0x00000001)
return 0;
}
/* timed out waiting for display to enable */
return -EIO;
}
static int ufx_config_sys_clk(struct ufx_data *dev)
{
int status = ufx_reg_write(dev, 0x700C, 0x8000000F);
check_warn_return(status, "error writing 0x700C");
status = ufx_reg_write(dev, 0x7014, 0x0010024F);
check_warn_return(status, "error writing 0x7014");
status = ufx_reg_write(dev, 0x7010, 0x00000000);
check_warn_return(status, "error writing 0x7010");
status = ufx_reg_clear_bits(dev, 0x700C, 0x0000000A);
check_warn_return(status, "error clearing PLL1 bypass in 0x700C");
msleep(1);
status = ufx_reg_clear_bits(dev, 0x700C, 0x80000000);
check_warn_return(status, "error clearing output gate in 0x700C");
return 0;
}
static int ufx_config_ddr2(struct ufx_data *dev)
{
int status, i = 0;
u32 tmp;
status = ufx_reg_write(dev, 0x0004, 0x001F0F77);
check_warn_return(status, "error writing 0x0004");
status = ufx_reg_write(dev, 0x0008, 0xFFF00000);
check_warn_return(status, "error writing 0x0008");
status = ufx_reg_write(dev, 0x000C, 0x0FFF2222);
check_warn_return(status, "error writing 0x000C");
status = ufx_reg_write(dev, 0x0010, 0x00030814);
check_warn_return(status, "error writing 0x0010");
status = ufx_reg_write(dev, 0x0014, 0x00500019);
check_warn_return(status, "error writing 0x0014");
status = ufx_reg_write(dev, 0x0018, 0x020D0F15);
check_warn_return(status, "error writing 0x0018");
status = ufx_reg_write(dev, 0x001C, 0x02532305);
check_warn_return(status, "error writing 0x001C");
status = ufx_reg_write(dev, 0x0020, 0x0B030905);
check_warn_return(status, "error writing 0x0020");
status = ufx_reg_write(dev, 0x0024, 0x00000827);
check_warn_return(status, "error writing 0x0024");
status = ufx_reg_write(dev, 0x0028, 0x00000000);
check_warn_return(status, "error writing 0x0028");
status = ufx_reg_write(dev, 0x002C, 0x00000042);
check_warn_return(status, "error writing 0x002C");
status = ufx_reg_write(dev, 0x0030, 0x09520000);
check_warn_return(status, "error writing 0x0030");
status = ufx_reg_write(dev, 0x0034, 0x02223314);
check_warn_return(status, "error writing 0x0034");
status = ufx_reg_write(dev, 0x0038, 0x00430043);
check_warn_return(status, "error writing 0x0038");
status = ufx_reg_write(dev, 0x003C, 0xF00F000F);
check_warn_return(status, "error writing 0x003C");
status = ufx_reg_write(dev, 0x0040, 0xF380F00F);
check_warn_return(status, "error writing 0x0040");
status = ufx_reg_write(dev, 0x0044, 0xF00F0496);
check_warn_return(status, "error writing 0x0044");
status = ufx_reg_write(dev, 0x0048, 0x03080406);
check_warn_return(status, "error writing 0x0048");
status = ufx_reg_write(dev, 0x004C, 0x00001000);
check_warn_return(status, "error writing 0x004C");
status = ufx_reg_write(dev, 0x005C, 0x00000007);
check_warn_return(status, "error writing 0x005C");
status = ufx_reg_write(dev, 0x0100, 0x54F00012);
check_warn_return(status, "error writing 0x0100");
status = ufx_reg_write(dev, 0x0104, 0x00004012);
check_warn_return(status, "error writing 0x0104");
status = ufx_reg_write(dev, 0x0118, 0x40404040);
check_warn_return(status, "error writing 0x0118");
status = ufx_reg_write(dev, 0x0000, 0x00000001);
check_warn_return(status, "error writing 0x0000");
while (i++ < 500) {
status = ufx_reg_read(dev, 0x0000, &tmp);
check_warn_return(status, "error reading 0x0000");
if (all_bits_set(tmp, 0xC0000000))
return 0;
}
pr_err("DDR2 initialisation timed out, reg 0x0000=0x%08x", tmp);
return -ETIMEDOUT;
}
struct pll_values {
u32 div_r0;
u32 div_f0;
u32 div_q0;
u32 range0;
u32 div_r1;
u32 div_f1;
u32 div_q1;
u32 range1;
};
static u32 ufx_calc_range(u32 ref_freq)
{
if (ref_freq >= 88000000)
return 7;
if (ref_freq >= 54000000)
return 6;
if (ref_freq >= 34000000)
return 5;
if (ref_freq >= 21000000)
return 4;
if (ref_freq >= 13000000)
return 3;
if (ref_freq >= 8000000)
return 2;
return 1;
}
/* calculates PLL divider settings for a desired target frequency */
static void ufx_calc_pll_values(const u32 clk_pixel_pll, struct pll_values *asic_pll)
{
const u32 ref_clk = 25000000;
u32 div_r0, div_f0, div_q0, div_r1, div_f1, div_q1;
u32 min_error = clk_pixel_pll;
for (div_r0 = 1; div_r0 <= 32; div_r0++) {
u32 ref_freq0 = ref_clk / div_r0;
if (ref_freq0 < 5000000)
break;
if (ref_freq0 > 200000000)
continue;
for (div_f0 = 1; div_f0 <= 256; div_f0++) {
u32 vco_freq0 = ref_freq0 * div_f0;
if (vco_freq0 < 350000000)
continue;
if (vco_freq0 > 700000000)
break;
for (div_q0 = 0; div_q0 < 7; div_q0++) {
u32 pllout_freq0 = vco_freq0 / (1 << div_q0);
if (pllout_freq0 < 5000000)
break;
if (pllout_freq0 > 200000000)
continue;
for (div_r1 = 1; div_r1 <= 32; div_r1++) {
u32 ref_freq1 = pllout_freq0 / div_r1;
if (ref_freq1 < 5000000)
break;
for (div_f1 = 1; div_f1 <= 256; div_f1++) {
u32 vco_freq1 = ref_freq1 * div_f1;
if (vco_freq1 < 350000000)
continue;
if (vco_freq1 > 700000000)
break;
for (div_q1 = 0; div_q1 < 7; div_q1++) {
u32 pllout_freq1 = vco_freq1 / (1 << div_q1);
int error = abs(pllout_freq1 - clk_pixel_pll);
if (pllout_freq1 < 5000000)
break;
if (pllout_freq1 > 700000000)
continue;
if (error < min_error) {
min_error = error;
/* final returned value is equal to calculated value - 1
* because a value of 0 = divide by 1 */
asic_pll->div_r0 = div_r0 - 1;
asic_pll->div_f0 = div_f0 - 1;
asic_pll->div_q0 = div_q0;
asic_pll->div_r1 = div_r1 - 1;
asic_pll->div_f1 = div_f1 - 1;
asic_pll->div_q1 = div_q1;
asic_pll->range0 = ufx_calc_range(ref_freq0);
asic_pll->range1 = ufx_calc_range(ref_freq1);
if (min_error == 0)
return;
}
}
}
}
}
}
}
}
/* sets analog bit PLL configuration values */
static int ufx_config_pix_clk(struct ufx_data *dev, u32 pixclock)
{
struct pll_values asic_pll = {0};
u32 value, clk_pixel, clk_pixel_pll;
int status;
/* convert pixclock (in ps) to frequency (in Hz) */
clk_pixel = PICOS2KHZ(pixclock) * 1000;
pr_debug("pixclock %d ps = clk_pixel %d Hz", pixclock, clk_pixel);
/* clk_pixel = 1/2 clk_pixel_pll */
clk_pixel_pll = clk_pixel * 2;
ufx_calc_pll_values(clk_pixel_pll, &asic_pll);
/* Keep BYPASS and RESET signals asserted until configured */
status = ufx_reg_write(dev, 0x7000, 0x8000000F);
check_warn_return(status, "error writing 0x7000");
value = (asic_pll.div_f1 | (asic_pll.div_r1 << 8) |
(asic_pll.div_q1 << 16) | (asic_pll.range1 << 20));
status = ufx_reg_write(dev, 0x7008, value);
check_warn_return(status, "error writing 0x7008");
value = (asic_pll.div_f0 | (asic_pll.div_r0 << 8) |
(asic_pll.div_q0 << 16) | (asic_pll.range0 << 20));
status = ufx_reg_write(dev, 0x7004, value);
check_warn_return(status, "error writing 0x7004");
status = ufx_reg_clear_bits(dev, 0x7000, 0x00000005);
check_warn_return(status,
"error clearing PLL0 bypass bits in 0x7000");
msleep(1);
status = ufx_reg_clear_bits(dev, 0x7000, 0x0000000A);
check_warn_return(status,
"error clearing PLL1 bypass bits in 0x7000");
msleep(1);
status = ufx_reg_clear_bits(dev, 0x7000, 0x80000000);
check_warn_return(status, "error clearing gate bits in 0x7000");
return 0;
}
static int ufx_set_vid_mode(struct ufx_data *dev, struct fb_var_screeninfo *var)
{
u32 temp;
u16 h_total, h_active, h_blank_start, h_blank_end, h_sync_start, h_sync_end;
u16 v_total, v_active, v_blank_start, v_blank_end, v_sync_start, v_sync_end;
int status = ufx_reg_write(dev, 0x8028, 0);
check_warn_return(status, "ufx_set_vid_mode error disabling RGB pad");
status = ufx_reg_write(dev, 0x8024, 0);
check_warn_return(status, "ufx_set_vid_mode error disabling VDAC");
/* shut everything down before changing timing */
status = ufx_blank(dev, true);
check_warn_return(status, "ufx_set_vid_mode error blanking display");
status = ufx_disable(dev, true);
check_warn_return(status, "ufx_set_vid_mode error disabling display");
status = ufx_config_pix_clk(dev, var->pixclock);
check_warn_return(status, "ufx_set_vid_mode error configuring pixclock");
status = ufx_reg_write(dev, 0x2000, 0x00000104);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2000");
/* set horizontal timings */
h_total = var->xres + var->right_margin + var->hsync_len + var->left_margin;
h_active = var->xres;
h_blank_start = var->xres + var->right_margin;
h_blank_end = var->xres + var->right_margin + var->hsync_len;
h_sync_start = var->xres + var->right_margin;
h_sync_end = var->xres + var->right_margin + var->hsync_len;
temp = ((h_total - 1) << 16) | (h_active - 1);
status = ufx_reg_write(dev, 0x2008, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2008");
temp = ((h_blank_start - 1) << 16) | (h_blank_end - 1);
status = ufx_reg_write(dev, 0x200C, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x200C");
temp = ((h_sync_start - 1) << 16) | (h_sync_end - 1);
status = ufx_reg_write(dev, 0x2010, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2010");
/* set vertical timings */
v_total = var->upper_margin + var->yres + var->lower_margin + var->vsync_len;
v_active = var->yres;
v_blank_start = var->yres + var->lower_margin;
v_blank_end = var->yres + var->lower_margin + var->vsync_len;
v_sync_start = var->yres + var->lower_margin;
v_sync_end = var->yres + var->lower_margin + var->vsync_len;
temp = ((v_total - 1) << 16) | (v_active - 1);
status = ufx_reg_write(dev, 0x2014, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2014");
temp = ((v_blank_start - 1) << 16) | (v_blank_end - 1);
status = ufx_reg_write(dev, 0x2018, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2018");
temp = ((v_sync_start - 1) << 16) | (v_sync_end - 1);
status = ufx_reg_write(dev, 0x201C, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x201C");
status = ufx_reg_write(dev, 0x2020, 0x00000000);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2020");
status = ufx_reg_write(dev, 0x2024, 0x00000000);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2024");
/* Set the frame length register (#pix * 2 bytes/pixel) */
temp = var->xres * var->yres * 2;
temp = (temp + 7) & (~0x7);
status = ufx_reg_write(dev, 0x2028, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2028");
/* enable desired output interface & disable others */
status = ufx_reg_write(dev, 0x2040, 0);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
status = ufx_reg_write(dev, 0x2044, 0);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2044");
status = ufx_reg_write(dev, 0x2048, 0);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2048");
/* set the sync polarities & enable bit */
temp = 0x00000001;
if (var->sync & FB_SYNC_HOR_HIGH_ACT)
temp |= 0x00000010;
if (var->sync & FB_SYNC_VERT_HIGH_ACT)
temp |= 0x00000008;
status = ufx_reg_write(dev, 0x2040, temp);
check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
/* start everything back up */
status = ufx_enable(dev, true);
check_warn_return(status, "ufx_set_vid_mode error enabling display");
/* Unblank the display */
status = ufx_unblank(dev, true);
check_warn_return(status, "ufx_set_vid_mode error unblanking display");
/* enable RGB pad */
status = ufx_reg_write(dev, 0x8028, 0x00000003);
check_warn_return(status, "ufx_set_vid_mode error enabling RGB pad");
/* enable VDAC */
status = ufx_reg_write(dev, 0x8024, 0x00000007);
check_warn_return(status, "ufx_set_vid_mode error enabling VDAC");
return 0;
}
static int ufx_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
unsigned long start = vma->vm_start;
unsigned long size = vma->vm_end - vma->vm_start;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
unsigned long page, pos;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
if (size > info->fix.smem_len)
return -EINVAL;
if (offset > info->fix.smem_len - size)
return -EINVAL;
pos = (unsigned long)info->fix.smem_start + offset;
pr_debug("mmap() framebuffer addr:%lu size:%lu\n",
pos, size);
while (size > 0) {
page = vmalloc_to_pfn((void *)pos);
if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
return -EAGAIN;
start += PAGE_SIZE;
pos += PAGE_SIZE;
if (size > PAGE_SIZE)
size -= PAGE_SIZE;
else
size = 0;
}
return 0;
}
static void ufx_raw_rect(struct ufx_data *dev, u16 *cmd, int x, int y,
int width, int height)
{
size_t packed_line_len = ALIGN((width * 2), 4);
size_t packed_rect_len = packed_line_len * height;
int line;
BUG_ON(!dev);
BUG_ON(!dev->info);
/* command word */
*((u32 *)&cmd[0]) = cpu_to_le32(0x01);
/* length word */
*((u32 *)&cmd[2]) = cpu_to_le32(packed_rect_len + 16);
cmd[4] = cpu_to_le16(x);
cmd[5] = cpu_to_le16(y);
cmd[6] = cpu_to_le16(width);
cmd[7] = cpu_to_le16(height);
/* frame base address */
*((u32 *)&cmd[8]) = cpu_to_le32(0);
/* color mode and horizontal resolution */
cmd[10] = cpu_to_le16(0x4000 | dev->info->var.xres);
/* vertical resolution */
cmd[11] = cpu_to_le16(dev->info->var.yres);
/* packed data */
for (line = 0; line < height; line++) {
const int line_offset = dev->info->fix.line_length * (y + line);
const int byte_offset = line_offset + (x * BPP);
memcpy(&cmd[(24 + (packed_line_len * line)) / 2],
(char *)dev->info->fix.smem_start + byte_offset, width * BPP);
}
}
static int ufx_handle_damage(struct ufx_data *dev, int x, int y,
int width, int height)
{
size_t packed_line_len = ALIGN((width * 2), 4);
int len, status, urb_lines, start_line = 0;
if ((width <= 0) || (height <= 0) ||
(x + width > dev->info->var.xres) ||
(y + height > dev->info->var.yres))
return -EINVAL;
if (!atomic_read(&dev->usb_active))
return 0;
while (start_line < height) {
struct urb *urb = ufx_get_urb(dev);
if (!urb) {
pr_warn("ufx_handle_damage unable to get urb");
return 0;
}
/* assume we have enough space to transfer at least one line */
BUG_ON(urb->transfer_buffer_length < (24 + (width * 2)));
/* calculate the maximum number of lines we could fit in */
urb_lines = (urb->transfer_buffer_length - 24) / packed_line_len;
/* but we might not need this many */
urb_lines = min(urb_lines, (height - start_line));
memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
ufx_raw_rect(dev, urb->transfer_buffer, x, (y + start_line), width, urb_lines);
len = 24 + (packed_line_len * urb_lines);
status = ufx_submit_urb(dev, urb, len);
check_warn_return(status, "Error submitting URB");
start_line += urb_lines;
}
return 0;
}
/* Path triggered by usermode clients who write to filesystem
* e.g. cat filename > /dev/fb1
* Not used by X Windows or text-mode console. But useful for testing.
* Slow because of extra copy and we must assume all pixels dirty. */
static ssize_t ufx_ops_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t result;
struct ufx_data *dev = info->par;
u32 offset = (u32) *ppos;
result = fb_sys_write(info, buf, count, ppos);
if (result > 0) {
int start = max((int)(offset / info->fix.line_length), 0);
int lines = min((u32)((result / info->fix.line_length) + 1),
(u32)info->var.yres);
ufx_handle_damage(dev, 0, start, info->var.xres, lines);
}
return result;
}
static void ufx_ops_copyarea(struct fb_info *info,
const struct fb_copyarea *area)
{
struct ufx_data *dev = info->par;
sys_copyarea(info, area);
ufx_handle_damage(dev, area->dx, area->dy,
area->width, area->height);
}
static void ufx_ops_imageblit(struct fb_info *info,
const struct fb_image *image)
{
struct ufx_data *dev = info->par;
sys_imageblit(info, image);
ufx_handle_damage(dev, image->dx, image->dy,
image->width, image->height);
}
static void ufx_ops_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
struct ufx_data *dev = info->par;
sys_fillrect(info, rect);
ufx_handle_damage(dev, rect->dx, rect->dy, rect->width,
rect->height);
}
/* NOTE: fb_defio.c is holding info->fbdefio.mutex
* Touching ANY framebuffer memory that triggers a page fault
* in fb_defio will cause a deadlock, when it also tries to
* grab the same mutex. */
static void ufx_dpy_deferred_io(struct fb_info *info,
struct list_head *pagelist)
{
struct page *cur;
struct fb_deferred_io *fbdefio = info->fbdefio;
struct ufx_data *dev = info->par;
if (!fb_defio)
return;
if (!atomic_read(&dev->usb_active))
return;
/* walk the written page list and render each to device */
list_for_each_entry(cur, &fbdefio->pagelist, lru) {
/* create a rectangle of full screen width that encloses the
* entire dirty framebuffer page */
const int x = 0;
const int width = dev->info->var.xres;
const int y = (cur->index << PAGE_SHIFT) / (width * 2);
int height = (PAGE_SIZE / (width * 2)) + 1;
height = min(height, (int)(dev->info->var.yres - y));
BUG_ON(y >= dev->info->var.yres);
BUG_ON((y + height) > dev->info->var.yres);
ufx_handle_damage(dev, x, y, width, height);
}
}
static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct ufx_data *dev = info->par;
struct dloarea *area = NULL;
if (!atomic_read(&dev->usb_active))
return 0;
/* TODO: Update X server to get this from sysfs instead */
if (cmd == UFX_IOCTL_RETURN_EDID) {
u8 __user *edid = (u8 __user *)arg;
if (copy_to_user(edid, dev->edid, dev->edid_size))
return -EFAULT;
return 0;
}
/* TODO: Help propose a standard fb.h ioctl to report mmap damage */
if (cmd == UFX_IOCTL_REPORT_DAMAGE) {
/* If we have a damage-aware client, turn fb_defio "off"
* To avoid perf imact of unnecessary page fault handling.
* Done by resetting the delay for this fb_info to a very
* long period. Pages will become writable and stay that way.
* Reset to normal value when all clients have closed this fb.
*/
if (info->fbdefio)
info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE;
area = (struct dloarea *)arg;
if (area->x < 0)
area->x = 0;
if (area->x > info->var.xres)
area->x = info->var.xres;
if (area->y < 0)
area->y = 0;
if (area->y > info->var.yres)
area->y = info->var.yres;
ufx_handle_damage(dev, area->x, area->y, area->w, area->h);
}
return 0;
}
/* taken from vesafb */
static int
ufx_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info)
{
int err = 0;
if (regno >= info->cmap.len)
return 1;
if (regno < 16) {
if (info->var.red.offset == 10) {
/* 1:5:5:5 */
((u32 *) (info->pseudo_palette))[regno] =
((red & 0xf800) >> 1) |
((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
} else {
/* 0:5:6:5 */
((u32 *) (info->pseudo_palette))[regno] =
((red & 0xf800)) |
((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
}
}
return err;
}
/* It's common for several clients to have framebuffer open simultaneously.
* e.g. both fbcon and X. Makes things interesting.
* Assumes caller is holding info->lock (for open and release at least) */
static int ufx_ops_open(struct fb_info *info, int user)
{
struct ufx_data *dev = info->par;
/* fbcon aggressively connects to first framebuffer it finds,
* preventing other clients (X) from working properly. Usually
* not what the user wants. Fail by default with option to enable. */
if (user == 0 && !console)
return -EBUSY;
/* If the USB device is gone, we don't accept new opens */
if (dev->virtualized)
return -ENODEV;
dev->fb_count++;
kref_get(&dev->kref);
if (fb_defio && (info->fbdefio == NULL)) {
/* enable defio at last moment if not disabled by client */
struct fb_deferred_io *fbdefio;
fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
if (fbdefio) {
fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
fbdefio->deferred_io = ufx_dpy_deferred_io;
}
info->fbdefio = fbdefio;
fb_deferred_io_init(info);
}
pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d",
info->node, user, info, dev->fb_count);
return 0;
}
/*
* Called when all client interfaces to start transactions have been disabled,
* and all references to our device instance (ufx_data) are released.
* Every transaction must have a reference, so we know are fully spun down
*/
static void ufx_free(struct kref *kref)
{
struct ufx_data *dev = container_of(kref, struct ufx_data, kref);
/* this function will wait for all in-flight urbs to complete */
if (dev->urbs.count > 0)
ufx_free_urb_list(dev);
pr_debug("freeing ufx_data %p", dev);
kfree(dev);
}
static void ufx_release_urb_work(struct work_struct *work)
{
struct urb_node *unode = container_of(work, struct urb_node,
release_urb_work.work);
up(&unode->dev->urbs.limit_sem);
}
static void ufx_free_framebuffer_work(struct work_struct *work)
{
struct ufx_data *dev = container_of(work, struct ufx_data,
free_framebuffer_work.work);
struct fb_info *info = dev->info;
int node = info->node;
unregister_framebuffer(info);
if (info->cmap.len != 0)
fb_dealloc_cmap(&info->cmap);
if (info->monspecs.modedb)
fb_destroy_modedb(info->monspecs.modedb);
if (info->screen_base)
vfree(info->screen_base);
fb_destroy_modelist(&info->modelist);
dev->info = 0;
/* Assume info structure is freed after this point */
framebuffer_release(info);
pr_debug("fb_info for /dev/fb%d has been freed", node);
/* ref taken in probe() as part of registering framebfufer */
kref_put(&dev->kref, ufx_free);
}
/*
* Assumes caller is holding info->lock mutex (for open and release at least)
*/
static int ufx_ops_release(struct fb_info *info, int user)
{
struct ufx_data *dev = info->par;
dev->fb_count--;
/* We can't free fb_info here - fbmem will touch it when we return */
if (dev->virtualized && (dev->fb_count == 0))
schedule_delayed_work(&dev->free_framebuffer_work, HZ);
if ((dev->fb_count == 0) && (info->fbdefio)) {
fb_deferred_io_cleanup(info);
kfree(info->fbdefio);
info->fbdefio = NULL;
info->fbops->fb_mmap = ufx_ops_mmap;
}
pr_debug("released /dev/fb%d user=%d count=%d",
info->node, user, dev->fb_count);
kref_put(&dev->kref, ufx_free);
return 0;
}
/* Check whether a video mode is supported by the chip
* We start from monitor's modes, so don't need to filter that here */
static int ufx_is_valid_mode(struct fb_videomode *mode,
struct fb_info *info)
{
if ((mode->xres * mode->yres) > (2048 * 1152)) {
pr_debug("%dx%d too many pixels",
mode->xres, mode->yres);
return 0;
}
if (mode->pixclock < 5000) {
pr_debug("%dx%d %dps pixel clock too fast",
mode->xres, mode->yres, mode->pixclock);
return 0;
}
pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres,
mode->pixclock, (1000000 / mode->pixclock));
return 1;
}
static void ufx_var_color_format(struct fb_var_screeninfo *var)
{
const struct fb_bitfield red = { 11, 5, 0 };
const struct fb_bitfield green = { 5, 6, 0 };
const struct fb_bitfield blue = { 0, 5, 0 };
var->bits_per_pixel = 16;
var->red = red;
var->green = green;
var->blue = blue;
}
static int ufx_ops_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct fb_videomode mode;
/* TODO: support dynamically changing framebuffer size */
if ((var->xres * var->yres * 2) > info->fix.smem_len)
return -EINVAL;
/* set device-specific elements of var unrelated to mode */
ufx_var_color_format(var);
fb_var_to_videomode(&mode, var);
if (!ufx_is_valid_mode(&mode, info))
return -EINVAL;
return 0;
}
static int ufx_ops_set_par(struct fb_info *info)
{
struct ufx_data *dev = info->par;
int result;
u16 *pix_framebuffer;
int i;
pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres);
result = ufx_set_vid_mode(dev, &info->var);
if ((result == 0) && (dev->fb_count == 0)) {
/* paint greenscreen */
pix_framebuffer = (u16 *) info->screen_base;
for (i = 0; i < info->fix.smem_len / 2; i++)
pix_framebuffer[i] = 0x37e6;
ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres);
}
/* re-enable defio if previously disabled by damage tracking */
if (info->fbdefio)
info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
return result;
}
/* In order to come back from full DPMS off, we need to set the mode again */
static int ufx_ops_blank(int blank_mode, struct fb_info *info)
{
struct ufx_data *dev = info->par;
ufx_set_vid_mode(dev, &info->var);
return 0;
}
static struct fb_ops ufx_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
.fb_write = ufx_ops_write,
.fb_setcolreg = ufx_ops_setcolreg,
.fb_fillrect = ufx_ops_fillrect,
.fb_copyarea = ufx_ops_copyarea,
.fb_imageblit = ufx_ops_imageblit,
.fb_mmap = ufx_ops_mmap,
.fb_ioctl = ufx_ops_ioctl,
.fb_open = ufx_ops_open,
.fb_release = ufx_ops_release,
.fb_blank = ufx_ops_blank,
.fb_check_var = ufx_ops_check_var,
.fb_set_par = ufx_ops_set_par,
};
/* Assumes &info->lock held by caller
* Assumes no active clients have framebuffer open */
static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
{
int retval = -ENOMEM;
int old_len = info->fix.smem_len;
int new_len;
unsigned char *old_fb = info->screen_base;
unsigned char *new_fb;
pr_debug("Reallocating framebuffer. Addresses will change!");
new_len = info->fix.line_length * info->var.yres;
if (PAGE_ALIGN(new_len) > old_len) {
/*
* Alloc system memory for virtual framebuffer
*/
new_fb = vmalloc(new_len);
if (!new_fb) {
pr_err("Virtual framebuffer alloc failed");
goto error;
}
if (info->screen_base) {
memcpy(new_fb, old_fb, old_len);
vfree(info->screen_base);
}
info->screen_base = new_fb;
info->fix.smem_len = PAGE_ALIGN(new_len);
info->fix.smem_start = (unsigned long) new_fb;
info->flags = smscufx_info_flags;
}
retval = 0;
error:
return retval;
}
/* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master,
* restart enabled, but no start byte, enable controller */
static int ufx_i2c_init(struct ufx_data *dev)
{
u32 tmp;
/* disable the controller before it can be reprogrammed */
int status = ufx_reg_write(dev, 0x106C, 0x00);
check_warn_return(status, "failed to disable I2C");
/* Setup the clock count registers
* (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */
status = ufx_reg_write(dev, 0x1018, 12);
check_warn_return(status, "error writing 0x1018");
/* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */
status = ufx_reg_write(dev, 0x1014, 6);
check_warn_return(status, "error writing 0x1014");
status = ufx_reg_read(dev, 0x1000, &tmp);
check_warn_return(status, "error reading 0x1000");
/* set speed to std mode */
tmp &= ~(0x06);
tmp |= 0x02;
/* 7-bit (not 10-bit) addressing */
tmp &= ~(0x10);
/* enable restart conditions and master mode */
tmp |= 0x21;
status = ufx_reg_write(dev, 0x1000, tmp);
check_warn_return(status, "error writing 0x1000");
/* Set normal tx using target address 0 */
status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000);
check_warn_return(status, "error setting TX mode bits in 0x1004");
/* Enable the controller */
status = ufx_reg_write(dev, 0x106C, 0x01);
check_warn_return(status, "failed to enable I2C");
return 0;
}
/* sets the I2C port mux and target address */
static int ufx_i2c_configure(struct ufx_data *dev)
{
int status = ufx_reg_write(dev, 0x106C, 0x00);
check_warn_return(status, "failed to disable I2C");
status = ufx_reg_write(dev, 0x3010, 0x00000000);
check_warn_return(status, "failed to write 0x3010");
/* A0h is std for any EDID, right shifted by one */
status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1));
check_warn_return(status, "failed to set TAR bits in 0x1004");
status = ufx_reg_write(dev, 0x106C, 0x01);
check_warn_return(status, "failed to enable I2C");
return 0;
}
/* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no
* monitor is connected, there is no error except for timeout */
static int ufx_i2c_wait_busy(struct ufx_data *dev)
{
u32 tmp;
int i, status;
for (i = 0; i < 15; i++) {
status = ufx_reg_read(dev, 0x1100, &tmp);
check_warn_return(status, "0x1100 read failed");
/* if BUSY is clear, check for error */
if ((tmp & 0x80000000) == 0) {
if (tmp & 0x20000000) {
pr_warn("I2C read failed, 0x1100=0x%08x", tmp);
return -EIO;
}
return 0;
}
/* perform the first 10 retries without delay */
if (i >= 10)
msleep(10);
}
pr_warn("I2C access timed out, resetting I2C hardware");
status = ufx_reg_write(dev, 0x1100, 0x40000000);
check_warn_return(status, "0x1100 write failed");
return -ETIMEDOUT;
}
/* reads a 128-byte EDID block from the currently selected port and TAR */
static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len)
{
int i, j, status;
u32 *edid_u32 = (u32 *)edid;
BUG_ON(edid_len != EDID_LENGTH);
status = ufx_i2c_configure(dev);
if (status < 0) {
pr_err("ufx_i2c_configure failed");
return status;
}
memset(edid, 0xff, EDID_LENGTH);
/* Read the 128-byte EDID as 2 bursts of 64 bytes */
for (i = 0; i < 2; i++) {
u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8);
status = ufx_reg_write(dev, 0x1100, temp);
check_warn_return(status, "Failed to write 0x1100");
temp |= 0x80000000;
status = ufx_reg_write(dev, 0x1100, temp);
check_warn_return(status, "Failed to write 0x1100");
status = ufx_i2c_wait_busy(dev);
check_warn_return(status, "Timeout waiting for I2C BUSY to clear");
for (j = 0; j < 16; j++) {
u32 data_reg_addr = 0x1110 + (j * 4);
status = ufx_reg_read(dev, data_reg_addr, edid_u32++);
check_warn_return(status, "Error reading i2c data");
}
}
/* all FF's in the first 16 bytes indicates nothing is connected */
for (i = 0; i < 16; i++) {
if (edid[i] != 0xFF) {
pr_debug("edid data read successfully");
return EDID_LENGTH;
}
}
pr_warn("edid data contains all 0xff");
return -ETIMEDOUT;
}
/* 1) use sw default
* 2) Parse into various fb_info structs
* 3) Allocate virtual framebuffer memory to back highest res mode
*
* Parses EDID into three places used by various parts of fbdev:
* fb_var_screeninfo contains the timing of the monitor's preferred mode
* fb_info.monspecs is full parsed EDID info, including monspecs.modedb
* fb_info.modelist is a linked list of all monitor & VESA modes which work
*
* If EDID is not readable/valid, then modelist is all VESA modes,
* monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
* Returns 0 if successful */
static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
char *default_edid, size_t default_edid_size)
{
const struct fb_videomode *default_vmode = NULL;
u8 *edid;
int i, result = 0, tries = 3;
if (info->dev) /* only use mutex if info has been registered */
mutex_lock(&info->lock);
edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (!edid) {
result = -ENOMEM;
goto error;
}
fb_destroy_modelist(&info->modelist);
memset(&info->monspecs, 0, sizeof(info->monspecs));
/* Try to (re)read EDID from hardware first
* EDID data may return, but not parse as valid
* Try again a few times, in case of e.g. analog cable noise */
while (tries--) {
i = ufx_read_edid(dev, edid, EDID_LENGTH);
if (i >= EDID_LENGTH)
fb_edid_to_monspecs(edid, &info->monspecs);
if (info->monspecs.modedb_len > 0) {
dev->edid = edid;
dev->edid_size = i;
break;
}
}
/* If that fails, use a previously returned EDID if available */
if (info->monspecs.modedb_len == 0) {
pr_err("Unable to get valid EDID from device/display\n");
if (dev->edid) {
fb_edid_to_monspecs(dev->edid, &info->monspecs);
if (info->monspecs.modedb_len > 0)
pr_err("Using previously queried EDID\n");
}
}
/* If that fails, use the default EDID we were handed */
if (info->monspecs.modedb_len == 0) {
if (default_edid_size >= EDID_LENGTH) {
fb_edid_to_monspecs(default_edid, &info->monspecs);
if (info->monspecs.modedb_len > 0) {
memcpy(edid, default_edid, default_edid_size);
dev->edid = edid;
dev->edid_size = default_edid_size;
pr_err("Using default/backup EDID\n");
}
}
}
/* If we've got modes, let's pick a best default mode */
if (info->monspecs.modedb_len > 0) {
for (i = 0; i < info->monspecs.modedb_len; i++) {
if (ufx_is_valid_mode(&info->monspecs.modedb[i], info))
fb_add_videomode(&info->monspecs.modedb[i],
&info->modelist);
else /* if we've removed top/best mode */
info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
}
default_vmode = fb_find_best_display(&info->monspecs,
&info->modelist);
}
/* If everything else has failed, fall back to safe default mode */
if (default_vmode == NULL) {
struct fb_videomode fb_vmode = {0};
/* Add the standard VESA modes to our modelist
* Since we don't have EDID, there may be modes that
* overspec monitor and/or are incorrect aspect ratio, etc.
* But at least the user has a chance to choose
*/
for (i = 0; i < VESA_MODEDB_SIZE; i++) {
if (ufx_is_valid_mode((struct fb_videomode *)
&vesa_modes[i], info))
fb_add_videomode(&vesa_modes[i],
&info->modelist);
}
/* default to resolution safe for projectors
* (since they are most common case without EDID)
*/
fb_vmode.xres = 800;
fb_vmode.yres = 600;
fb_vmode.refresh = 60;
default_vmode = fb_find_nearest_mode(&fb_vmode,
&info->modelist);
}
/* If we have good mode and no active clients */
if ((default_vmode != NULL) && (dev->fb_count == 0)) {
fb_videomode_to_var(&info->var, default_vmode);
ufx_var_color_format(&info->var);
/* with mode size info, we can now alloc our framebuffer */
memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix));
info->fix.line_length = info->var.xres *
(info->var.bits_per_pixel / 8);
result = ufx_realloc_framebuffer(dev, info);
} else
result = -EINVAL;
error:
if (edid && (dev->edid != edid))
kfree(edid);
if (info->dev)
mutex_unlock(&info->lock);
return result;
}
static int ufx_usb_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *usbdev;
struct ufx_data *dev;
struct fb_info *info = 0;
int retval = -ENOMEM;
u32 id_rev, fpga_rev;
/* usb initialization */
usbdev = interface_to_usbdev(interface);
BUG_ON(!usbdev);
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");
goto error;
}
/* we need to wait for both usb and fbdev to spin down on disconnect */
kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
dev->udev = usbdev;
dev->gdev = &usbdev->dev; /* our generic struct device * */
usb_set_intfdata(interface, dev);
dev_dbg(dev->gdev, "%s %s - serial #%s\n",
usbdev->manufacturer, usbdev->product, usbdev->serial);
dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n",
usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
usbdev->descriptor.bcdDevice, dev);
dev_dbg(dev->gdev, "console enable=%d\n", console);
dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);
if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
retval = -ENOMEM;
dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");
goto error;
}
/* We don't register a new USB class. Our client interface is fbdev */
/* allocates framebuffer driver structure, not framebuffer memory */
info = framebuffer_alloc(0, &usbdev->dev);
if (!info) {
retval = -ENOMEM;
dev_err(dev->gdev, "framebuffer_alloc failed\n");
goto error;
}
dev->info = info;
info->par = dev;
info->pseudo_palette = dev->pseudo_palette;
info->fbops = &ufx_ops;
retval = fb_alloc_cmap(&info->cmap, 256, 0);
if (retval < 0) {
dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);
goto error;
}
INIT_DELAYED_WORK(&dev->free_framebuffer_work,
ufx_free_framebuffer_work);
INIT_LIST_HEAD(&info->modelist);
retval = ufx_reg_read(dev, 0x3000, &id_rev);
check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);
retval = ufx_reg_read(dev, 0x3004, &fpga_rev);
check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval);
dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev);
dev_dbg(dev->gdev, "resetting device");
retval = ufx_lite_reset(dev);
check_warn_goto_error(retval, "error %d resetting device", retval);
dev_dbg(dev->gdev, "configuring system clock");
retval = ufx_config_sys_clk(dev);
check_warn_goto_error(retval, "error %d configuring system clock", retval);
dev_dbg(dev->gdev, "configuring DDR2 controller");
retval = ufx_config_ddr2(dev);
check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval);
dev_dbg(dev->gdev, "configuring I2C controller");
retval = ufx_i2c_init(dev);
check_warn_goto_error(retval, "error %d initialising I2C controller", retval);
dev_dbg(dev->gdev, "selecting display mode");
retval = ufx_setup_modes(dev, info, NULL, 0);
check_warn_goto_error(retval, "unable to find common mode for display and adapter");
retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001);
check_warn_goto_error(retval, "error %d enabling graphics engine", retval);
/* ready to begin using device */
atomic_set(&dev->usb_active, 1);
dev_dbg(dev->gdev, "checking var");
retval = ufx_ops_check_var(&info->var, info);
check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval);
dev_dbg(dev->gdev, "setting par");
retval = ufx_ops_set_par(info);
check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval);
dev_dbg(dev->gdev, "registering framebuffer");
retval = register_framebuffer(info);
check_warn_goto_error(retval, "error %d register_framebuffer", retval);
dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution."
" Using %dK framebuffer memory\n", info->node,
info->var.xres, info->var.yres, info->fix.smem_len >> 10);
return 0;
error:
if (dev) {
if (info) {
if (info->cmap.len != 0)
fb_dealloc_cmap(&info->cmap);
if (info->monspecs.modedb)
fb_destroy_modedb(info->monspecs.modedb);
if (info->screen_base)
vfree(info->screen_base);
fb_destroy_modelist(&info->modelist);
framebuffer_release(info);
}
kref_put(&dev->kref, ufx_free); /* ref for framebuffer */
kref_put(&dev->kref, ufx_free); /* last ref from kref_init */
/* dev has been deallocated. Do not dereference */
}
return retval;
}
static void ufx_usb_disconnect(struct usb_interface *interface)
{
struct ufx_data *dev;
struct fb_info *info;
dev = usb_get_intfdata(interface);
info = dev->info;
pr_debug("USB disconnect starting\n");
/* we virtualize until all fb clients release. Then we free */
dev->virtualized = true;
/* When non-active we'll update virtual framebuffer, but no new urbs */
atomic_set(&dev->usb_active, 0);
usb_set_intfdata(interface, NULL);
/* if clients still have us open, will be freed on last close */
if (dev->fb_count == 0)
schedule_delayed_work(&dev->free_framebuffer_work, 0);
/* release reference taken by kref_init in probe() */
kref_put(&dev->kref, ufx_free);
/* consider ufx_data freed */
}
static struct usb_driver ufx_driver = {
.name = "smscufx",
.probe = ufx_usb_probe,
.disconnect = ufx_usb_disconnect,
.id_table = id_table,
};
module_usb_driver(ufx_driver);
static void ufx_urb_completion(struct urb *urb)
{
struct urb_node *unode = urb->context;
struct ufx_data *dev = unode->dev;
unsigned long flags;
/* sync/async unlink faults aren't errors */
if (urb->status) {
if (!(urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN)) {
pr_err("%s - nonzero write bulk status received: %d\n",
__func__, urb->status);
atomic_set(&dev->lost_pixels, 1);
}
}
urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
spin_lock_irqsave(&dev->urbs.lock, flags);
list_add_tail(&unode->entry, &dev->urbs.list);
dev->urbs.available++;
spin_unlock_irqrestore(&dev->urbs.lock, flags);
/* When using fb_defio, we deadlock if up() is called
* while another is waiting. So queue to another process */
if (fb_defio)
schedule_delayed_work(&unode->release_urb_work, 0);
else
up(&dev->urbs.limit_sem);
}
static void ufx_free_urb_list(struct ufx_data *dev)
{
int count = dev->urbs.count;
struct list_head *node;
struct urb_node *unode;
struct urb *urb;
int ret;
unsigned long flags;
pr_debug("Waiting for completes and freeing all render urbs\n");
/* keep waiting and freeing, until we've got 'em all */
while (count--) {
/* Getting interrupted means a leak, but ok at shutdown*/
ret = down_interruptible(&dev->urbs.limit_sem);
if (ret)
break;
spin_lock_irqsave(&dev->urbs.lock, flags);
node = dev->urbs.list.next; /* have reserved one with sem */
list_del_init(node);
spin_unlock_irqrestore(&dev->urbs.lock, flags);
unode = list_entry(node, struct urb_node, entry);
urb = unode->urb;
/* Free each separately allocated piece */
usb_free_coherent(urb->dev, dev->urbs.size,
urb->transfer_buffer, urb->transfer_dma);
usb_free_urb(urb);
kfree(node);
}
}
static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size)
{
int i = 0;
struct urb *urb;
struct urb_node *unode;
char *buf;
spin_lock_init(&dev->urbs.lock);
dev->urbs.size = size;
INIT_LIST_HEAD(&dev->urbs.list);
while (i < count) {
unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
if (!unode)
break;
unode->dev = dev;
INIT_DELAYED_WORK(&unode->release_urb_work,
ufx_release_urb_work);
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(unode);
break;
}
unode->urb = urb;
buf = usb_alloc_coherent(dev->udev, size, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
kfree(unode);
usb_free_urb(urb);
break;
}
/* urb->transfer_buffer_length set to actual before submit */
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
buf, size, ufx_urb_completion, unode);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
list_add_tail(&unode->entry, &dev->urbs.list);
i++;
}
sema_init(&dev->urbs.limit_sem, i);
dev->urbs.count = i;
dev->urbs.available = i;
pr_debug("allocated %d %d byte urbs\n", i, (int) size);
return i;
}
static struct urb *ufx_get_urb(struct ufx_data *dev)
{
int ret = 0;
struct list_head *entry;
struct urb_node *unode;
struct urb *urb = NULL;
unsigned long flags;
/* Wait for an in-flight buffer to complete and get re-queued */
ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
if (ret) {
atomic_set(&dev->lost_pixels, 1);
pr_warn("wait for urb interrupted: %x available: %d\n",
ret, dev->urbs.available);
goto error;
}
spin_lock_irqsave(&dev->urbs.lock, flags);
BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
entry = dev->urbs.list.next;
list_del_init(entry);
dev->urbs.available--;
spin_unlock_irqrestore(&dev->urbs.lock, flags);
unode = list_entry(entry, struct urb_node, entry);
urb = unode->urb;
error:
return urb;
}
static int ufx_submit_urb(struct ufx_data *dev, struct urb *urb, size_t len)
{
int ret;
BUG_ON(len > dev->urbs.size);
urb->transfer_buffer_length = len; /* set to actual payload len */
ret = usb_submit_urb(urb, GFP_KERNEL);
if (ret) {
ufx_urb_completion(urb); /* because no one else will */
atomic_set(&dev->lost_pixels, 1);
pr_err("usb_submit_urb error %x\n", ret);
}
return ret;
}
module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
MODULE_PARM_DESC(console, "Allow fbcon to be used on this display");
module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support");
MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver");
MODULE_LICENSE("GPL");
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