diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/smscufx.c | 1988 |
1 files changed, 1988 insertions, 0 deletions
diff --git a/drivers/video/fbdev/smscufx.c b/drivers/video/fbdev/smscufx.c new file mode 100644 index 000000000..2ad6e98ce --- /dev/null +++ b/drivers/video/fbdev/smscufx.c @@ -0,0 +1,1988 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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> + * + * 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 */ + 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 const 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); + +static DEFINE_MUTEX(disconnect_mutex); + +/* 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 (info->fbdefio) + return fb_deferred_io_mmap(info, vma); + + 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 *pagereflist) +{ + struct ufx_data *dev = info->par; + struct fb_deferred_io_pageref *pageref; + + 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(pageref, pagereflist, list) { + /* 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 = pageref->offset / (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; + + mutex_lock(&disconnect_mutex); + + /* If the USB device is gone, we don't accept new opens */ + if (dev->virtualized) { + mutex_unlock(&disconnect_mutex); + 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(*fbdefio), 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); + + mutex_unlock(&disconnect_mutex); + + 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); + + kfree(dev); +} + +static void ufx_ops_destory(struct fb_info *info) +{ + struct ufx_data *dev = info->par; + int node = info->node; + + /* Assume info structure is freed after this point */ + framebuffer_release(info); + + pr_debug("fb_info for /dev/fb%d has been freed", node); + + /* release reference taken by kref_init in probe() */ + kref_put(&dev->kref, ufx_free); +} + + +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(struct ufx_data *dev) +{ + struct fb_info *info = dev->info; + + if (info->cmap.len != 0) + fb_dealloc_cmap(&info->cmap); + if (info->monspecs.modedb) + fb_destroy_modedb(info->monspecs.modedb); + vfree(info->screen_base); + + fb_destroy_modelist(&info->modelist); + + dev->info = NULL; + + /* 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; + + mutex_lock(&disconnect_mutex); + + dev->fb_count--; + + /* We can't free fb_info here - fbmem will touch it when we return */ + if (dev->virtualized && (dev->fb_count == 0)) + ufx_free_framebuffer(dev); + + if ((dev->fb_count == 0) && (info->fbdefio)) { + fb_deferred_io_cleanup(info); + kfree(info->fbdefio); + info->fbdefio = NULL; + } + + pr_debug("released /dev/fb%d user=%d count=%d", + info->node, user, dev->fb_count); + + kref_put(&dev->kref, ufx_free); + + mutex_unlock(&disconnect_mutex); + + 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 const 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, + .fb_destroy = ufx_ops_destory, +}; + +/* 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 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) + return -ENOMEM; + + 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; + } + return 0; +} + +/* 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; + 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"); + return -ENOMEM; + } + + /* 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", + le16_to_cpu(usbdev->descriptor.idVendor), + le16_to_cpu(usbdev->descriptor.idProduct), + le16_to_cpu(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)) { + dev_err(dev->gdev, "ufx_alloc_urb_list failed\n"); + goto put_ref; + } + + /* 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) { + dev_err(dev->gdev, "framebuffer_alloc failed\n"); + goto free_urb_list; + } + + dev->info = info; + info->par = dev; + info->pseudo_palette = dev->pseudo_palette; + info->fbops = &ufx_ops; + INIT_LIST_HEAD(&info->modelist); + + retval = fb_alloc_cmap(&info->cmap, 256, 0); + if (retval < 0) { + dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval); + goto destroy_modedb; + } + + 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); + if (retval < 0) { + dev_err(dev->gdev, "error %d enabling graphics engine", retval); + goto setup_modes; + } + + /* 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); + if (retval < 0) { + dev_err(dev->gdev, "error %d ufx_ops_check_var", retval); + goto reset_active; + } + + dev_dbg(dev->gdev, "setting par"); + retval = ufx_ops_set_par(info); + if (retval < 0) { + dev_err(dev->gdev, "error %d ufx_ops_set_par", retval); + goto reset_active; + } + + dev_dbg(dev->gdev, "registering framebuffer"); + retval = register_framebuffer(info); + if (retval < 0) { + dev_err(dev->gdev, "error %d register_framebuffer", retval); + goto reset_active; + } + + 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; + +reset_active: + atomic_set(&dev->usb_active, 0); +setup_modes: + fb_destroy_modedb(info->monspecs.modedb); + vfree(info->screen_base); + fb_destroy_modelist(&info->modelist); +error: + fb_dealloc_cmap(&info->cmap); +destroy_modedb: + framebuffer_release(info); +free_urb_list: + if (dev->urbs.count > 0) + ufx_free_urb_list(dev); +put_ref: + kref_put(&dev->kref, ufx_free); /* ref for framebuffer */ + kref_put(&dev->kref, ufx_free); /* last ref from kref_init */ + return retval; +} + +static void ufx_usb_disconnect(struct usb_interface *interface) +{ + struct ufx_data *dev; + struct fb_info *info; + + mutex_lock(&disconnect_mutex); + + 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) + ufx_free_framebuffer(dev); + + /* 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); + + unregister_framebuffer(info); + + mutex_unlock(&disconnect_mutex); +} + +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(*unode), 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"); |