Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751837AbXBWGdI (ORCPT ); Fri, 23 Feb 2007 01:33:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751840AbXBWGdI (ORCPT ); Fri, 23 Feb 2007 01:33:08 -0500 Received: from wr-out-0506.google.com ([64.233.184.234]:27043 "EHLO wr-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751837AbXBWGdE (ORCPT ); Fri, 23 Feb 2007 01:33:04 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:date:from:to:subject:message-id:mime-version:content-type:content-disposition:user-agent; b=oKd0C5KHc8OkCeTL+y3xkaaxKUc/qyR4KSTZyCLQbf2tLPCSaY7Cho9zjE4gZVJe3NLBwKdgytfWqUFABQIGAYKKcrUM1523VmvCrDQR/1gOXG1BdaiLYC7cmOwGhOb1iQRZ+I4qo59Tpc36UhK07vWlWM37Ud9/qISI7Zgcy2Y= Date: Fri, 23 Feb 2007 07:32:28 +0100 From: Jaya Kumar To: linux-fbdev-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC 2.6.20 1/1] fbdev,mm: Deferred IO and hecubafb driver Message-ID: <20070223063228.GA9906@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 25834 Lines: 919 Hi Tony, Paul, Peter, fbdev, lkml, and mm, This is a first pass at abstracting deferred IO out from hecubafb and into fbdev as was discussed before: http://marc.theaimsgroup.com/?l=linux-fbdev-devel&m=117187443327466&w=2 Please let me know your feedback and if it looks okay so far. Thanks, jaya Signed-off-by: Jaya Kumar --- Documentation/fb/deferred_io.txt | 114 ++++++++ drivers/video/Kconfig | 20 + drivers/video/Makefile | 2 drivers/video/fb_defio.c | 104 +++++++ drivers/video/fbmem.c | 2 drivers/video/hecubafb.c | 513 +++++++++++++++++++++++++++++++++++++++ include/linux/fb.h | 25 + mm/rmap.c | 1 8 files changed, 781 insertions(+) diff --git a/Documentation/fb/deferred_io.txt b/Documentation/fb/deferred_io.txt new file mode 100644 index 0000000..be74dcc --- /dev/null +++ b/Documentation/fb/deferred_io.txt @@ -0,0 +1,114 @@ +Deferred IO +----------- + +Deferred IO is a way to delay and repurpose IO. It uses host memory as a +buffer and the MMU pagefault as a pretrigger for when to perform the device +IO. The following example may be a useful explaination of how one such setup +works: + +- userspace app like Xfbdev mmaps framebuffer +- deferred IO and driver sets up nopage and page_mkwrite handlers +- userspace app tries to write to mmaped vaddress +- we get pagefault and reach nopage handler +- nopage handler finds and returns physical page +- we get page_mkwrite where we add this page to a list +- schedule a workqueue task to be run after a delay +- app continues writing to that page with no additional cost. this is + the key benefit. +- the workqueue task comes in and mkcleans the pages on the list, then + completes the work associated with updating the framebuffer. this is + the real work talking to the device. +- app tries to write to the address (that has now been mkcleaned) +- get pagefault and the above sequence occurs again + +As can be seen from above, one benefit is roughly to allow bursty framebuffer +writes to occur at minimum cost. Then after some time when hopefully things +have gone quiet, we go and really update the framebuffer which would be +a relatively more expensive operation. + +For some types of nonvolatile high latency displays, the desired image is +the final image rather than the intermediate stages which is why it's okay +to not update for each write that is occuring. + +It may be the case that this is useful in other scenarios as well. Paul Mundt +has mentioned a case where it is beneficial to use the page count to decide +whether to coalesce and issue SG DMA or to do memory bursts. + +Another one may be if one has a device framebuffer that is in an usual format, +say diagonally shifting RGB, this may then be a mechanism for you to allow +apps to pretend to have a normal framebuffer but reswizzle for the device +framebuffer at vsync time based on the touched pagelist. + +How to use it: (for applications) +--------------------------------- +No changes needed. mmap the framebuffer like normal and just use it. + +How to use it: (for fbdev drivers) +---------------------------------- +The following example may be helpful. + +1. Setup your mmap and vm_ops structures. Eg: + +static struct fb_deferred_io hecubafb_defio = { + .delay = HZ, + .deferred_io = hecubafb_dpy_deferred_io, +}; + +The delay is the minimum delay between when the page_mkwrite trigger occurs +and when the deferred_io callback is called. The deferred_io callback is +explained below. + +static struct vm_operations_struct hecubafb_vm_ops = { + .nopage = hecubafb_vm_nopage, + .page_mkwrite = fb_deferred_io_mkwrite, +}; + +You will need a nopage routine to find and retrive the struct page for your +framebuffer pages. You must set page_mkwrite to fb_deferred_io_mkwrite. +Here's the example nopage for hecubafb where it is a vmalloced framebuffer. + +static int hecubafb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + vma->vm_ops = &hecubafb_vm_ops; + vma->vm_flags |= ( VM_IO | VM_RESERVED | VM_DONTEXPAND ); + vma->vm_private_data = info; + return 0; +} + +static struct page* hecubafb_vm_nopage(struct vm_area_struct *vma, + unsigned long vaddr, int *type) +{ + unsigned long offset; + struct page *page; + struct fb_info *info = vma->vm_private_data; + + offset = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT); + if (offset >= (DPY_W*DPY_H)/8) + return NOPAGE_SIGBUS; + + page = vmalloc_to_page(info->screen_base + offset); + if (!page) + return NOPAGE_OOM; + + get_page(page); + if (type) + *type = VM_FAULT_MINOR; + return page; +} + +2. Setup your deferred IO callback. Eg: +static void hecubafb_dpy_deferred_io(struct fb_info *info, + struct list_head *pagelist) + +The deferred_io callback is where you would perform all your IO to the display +device. You receive the pagelist which is the list of pages that were written +to during the delay. You must not modify this list. This callback is called +from a workqueue. + +3. Call init (done inside register_framebuffer) + info->fbdefio = &hecubafb_defio; + + retval = register_framebuffer(info); + +4. Call cleanup (done inside unregister_framebuffer) + unregister_framebuffer(info); diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 8874cf2..a03c772 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -85,6 +85,12 @@ config FB_CFB_IMAGEBLIT blitting. This is used by drivers that don't provide their own (accelerated) version. +# used by hecubafb +config FB_DEFERRED_IO + bool + depends on FB + default n + config FB_SVGALIB tristate depends on FB @@ -540,6 +546,20 @@ config FB_IMAC help This is the frame buffer device driver for the Intel-based Macintosh +config FB_HECUBA + tristate "Hecuba board support" + depends on FB && X86 && MMU + select FB_CFB_FILLRECT + select FB_CFB_COPYAREA + select FB_CFB_IMAGEBLIT + select FB_DEFERRED_IO + help + This enables support for the Hecuba board. This driver was tested + with an E-Ink 800x600 display and x86 SBCs through a 16 bit GPIO + interface (8 bit data, 4 bit control). If you anticpate using + this driver, say Y or M; otherwise say N. You must specify the + GPIO IO address to be used for setting control and data. + config FB_HGA tristate "Hercules mono graphics support" depends on FB && X86 diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 6801edf..c36a323 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_FB_CFB_IMAGEBLIT) += cfbimgblt.o obj-$(CONFIG_FB_SVGALIB) += svgalib.o obj-$(CONFIG_FB_MACMODES) += macmodes.o obj-$(CONFIG_FB_DDC) += fb_ddc.o +obj-$(CONFIG_FB_DEFERRED_IO) += fb_defio.o # Hardware specific drivers go first obj-$(CONFIG_FB_AMIGA) += amifb.o c2p.o @@ -65,6 +66,7 @@ obj-$(CONFIG_FB_SGIVW) += sgivwfb.o obj-$(CONFIG_FB_ACORN) += acornfb.o obj-$(CONFIG_FB_ATARI) += atafb.o obj-$(CONFIG_FB_MAC) += macfb.o +obj-$(CONFIG_FB_HECUBA) += hecubafb.o obj-$(CONFIG_FB_HGA) += hgafb.o obj-$(CONFIG_FB_IGA) += igafb.o obj-$(CONFIG_FB_APOLLO) += dnfb.o diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c new file mode 100644 index 0000000..c3e57cc --- /dev/null +++ b/drivers/video/fb_defio.c @@ -0,0 +1,104 @@ +/* + * linux/drivers/video/fb_defio.c + * + * Copyright (C) 2006 Jaya Kumar + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* to support deferred IO */ +#include +#include + +/* workqueue callback */ +static void fb_deferred_io_work(struct work_struct *work) +{ + struct fb_info *info = container_of(work, struct fb_info, + deferred_work.work); + struct list_head *node, *next; + struct page *cur; + struct fb_deferred_io *fbdefio = info->fbdefio; + + /* here we mkclean the pages, then do all deferred IO */ + mutex_lock(&fbdefio->lock); + list_for_each_entry(cur, &fbdefio->pagelist, lru) { + lock_page(cur); + page_mkclean(cur); + unlock_page(cur); + } + + /* driver's callback with pagelist */ + fbdefio->deferred_io(info, &fbdefio->pagelist); + + /* clear the list */ + list_for_each_safe(node, next, &fbdefio->pagelist) { + list_del(node); + } + mutex_unlock(&fbdefio->lock); +} + +/* vm_ops->page_mkwrite handler */ +int fb_deferred_io_mkwrite(struct vm_area_struct *vma, + struct page *page) +{ + struct fb_info *info = vma->vm_private_data; + struct fb_deferred_io *fbdefio = info->fbdefio; + + /* this is a callback we get when userspace first tries to + write to the page. we schedule a workqueue. that workqueue + will eventually mkclean the touched pages and execute the + deferred framebuffer IO. then if userspace touches a page + again, we repeat the same scheme */ + + /* protect against the workqueue changing the page list */ + mutex_lock(&fbdefio->lock); + list_add(&page->lru, &fbdefio->pagelist); + mutex_unlock(&fbdefio->lock); + + /* come back after delay to process the deferred IO */ + schedule_delayed_work(&info->deferred_work, fbdefio->delay); + return 0; +} +EXPORT_SYMBOL_GPL(fb_deferred_io_mkwrite); + +void fb_deferred_io_init(struct fb_info *info) +{ + struct fb_deferred_io *fbdefio = info->fbdefio; + + if (!fbdefio) + return; + mutex_init(&fbdefio->lock); + INIT_DELAYED_WORK(&info->deferred_work, fb_deferred_io_work); + INIT_LIST_HEAD(&fbdefio->pagelist); + if (fbdefio->delay == 0) /* set a default of 1 s */ + fbdefio->delay = HZ; +} +EXPORT_SYMBOL_GPL(fb_deferred_io_init); + +void fb_deferred_io_cleanup(struct fb_info *info) +{ + struct fb_deferred_io *fbdefio = info->fbdefio; + + if (!fbdefio) + return; + cancel_delayed_work(&info->deferred_work); + flush_scheduled_work(); +} +EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup); + +MODULE_LICENSE("GPL"); diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index 2822526..863126a 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -1325,6 +1325,7 @@ register_framebuffer(struct fb_info *fb_info) event.info = fb_info; fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); + fb_deferred_io_init(fb_info); return 0; } @@ -1355,6 +1356,7 @@ unregister_framebuffer(struct fb_info *fb_info) fb_destroy_modelist(&fb_info->modelist); registered_fb[i]=NULL; num_registered_fb--; + fb_deferred_io_cleanup(fb_info); fb_cleanup_device(fb_info); device_destroy(fb_class, MKDEV(FB_MAJOR, i)); event.info = fb_info; diff --git a/drivers/video/hecubafb.c b/drivers/video/hecubafb.c new file mode 100644 index 0000000..519659a --- /dev/null +++ b/drivers/video/hecubafb.c @@ -0,0 +1,513 @@ +/* + * linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller + * + * Copyright (C) 2006, Jaya Kumar + * This work was sponsored by CIS(M) Sdn Bhd + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + * + * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven. + * This work was possible because of apollo display code from E-Ink's website + * http://support.eink.com/community + * All information used to write this code is from public material made + * available by E-Ink on its support site. Some commands such as 0xA4 + * were found by looping through cmd=0x00 thru 0xFF and supplying random + * values. There are other commands that the display is capable of, + * beyond the 5 used here but they are more complex. + * + * This driver is written to be used with the Hecuba display controller + * board, and tested with the EInk 800x600 display in 1 bit mode. + * The interface between Hecuba and the host is TTL based GPIO. The + * GPIO requirements are 8 writable data lines and 6 lines for control. + * Only 4 of the controls are actually used here but 6 for future use. + * The driver requires the IO addresses for data and control GPIO at + * load time. It is also possible to use this display with a standard + * PC parallel port. + * + * General notes: + * - User must set hecubafb_enable=1 to enable it + * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Apollo controller specific defines */ +#define APOLLO_START_NEW_IMG 0xA0 +#define APOLLO_STOP_IMG_DATA 0xA1 +#define APOLLO_DISPLAY_IMG 0xA2 +#define APOLLO_ERASE_DISPLAY 0xA3 +#define APOLLO_INIT_DISPLAY 0xA4 + +/* Hecuba interface specific defines */ +/* WUP is inverted, CD is inverted, DS is inverted */ +#define HCB_NWUP_BIT 0x01 +#define HCB_NDS_BIT 0x02 +#define HCB_RW_BIT 0x04 +#define HCB_NCD_BIT 0x08 +#define HCB_ACK_BIT 0x80 + +/* Display specific information */ +#define DPY_W 600 +#define DPY_H 800 + +struct hecubafb_par { + unsigned long dio_addr; + unsigned long cio_addr; + unsigned long c2io_addr; + unsigned char ctl; + struct fb_info *info; + unsigned int irq; +}; + +static struct fb_fix_screeninfo hecubafb_fix __initdata = { + .id = "hecubafb", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_MONO01, + .xpanstep = 0, + .ypanstep = 0, + .ywrapstep = 0, + .accel = FB_ACCEL_NONE, +}; + +static struct fb_var_screeninfo hecubafb_var __initdata = { + .xres = DPY_W, + .yres = DPY_H, + .xres_virtual = DPY_W, + .yres_virtual = DPY_H, + .bits_per_pixel = 1, + .nonstd = 1, +}; + +static unsigned long dio_addr; +static unsigned long cio_addr; +static unsigned long c2io_addr; +static unsigned long splashval; +static unsigned int nosplash; +static unsigned int hecubafb_enable; +static unsigned int irq; + +static DECLARE_WAIT_QUEUE_HEAD(hecubafb_waitq); + +static void hcb_set_ctl(struct hecubafb_par *par) +{ + outb(par->ctl, par->cio_addr); +} + +static unsigned char hcb_get_ctl(struct hecubafb_par *par) +{ + return inb(par->c2io_addr); +} + +static void hcb_set_data(struct hecubafb_par *par, unsigned char value) +{ + outb(value, par->dio_addr); +} + +static int __devinit apollo_init_control(struct hecubafb_par *par) +{ + unsigned char ctl; + /* for init, we want the following setup to be set: + WUP = lo + ACK = hi + DS = hi + RW = hi + CD = lo + */ + + /* write WUP to lo, DS to hi, RW to hi, CD to lo */ + par->ctl = HCB_NWUP_BIT | HCB_RW_BIT | HCB_NCD_BIT ; + par->ctl &= ~HCB_NDS_BIT; + hcb_set_ctl(par); + + /* check ACK is not lo */ + ctl = hcb_get_ctl(par); + if ((ctl & HCB_ACK_BIT)) { + printk(KERN_ERR "Fail because ACK is already low\n"); + return -ENXIO; + } + + return 0; +} + +void hcb_wait_for_ack(struct hecubafb_par *par) +{ + + int timeout; + unsigned char ctl; + + timeout=500; + do { + ctl = hcb_get_ctl(par); + if ((ctl & HCB_ACK_BIT)) + return; + udelay(1); + } while (timeout--); + printk(KERN_ERR "timed out waiting for ack\n"); +} + +void hcb_wait_for_ack_clear(struct hecubafb_par *par) +{ + + int timeout; + unsigned char ctl; + + timeout=500; + do { + ctl = hcb_get_ctl(par); + if (!(ctl & HCB_ACK_BIT)) + return; + udelay(1); + } while (timeout--); + printk(KERN_ERR "timed out waiting for clear\n"); +} + +void apollo_send_data(struct hecubafb_par *par, unsigned char data) +{ + /* set data */ + hcb_set_data(par, data); + + /* set DS low */ + par->ctl |= HCB_NDS_BIT; + hcb_set_ctl(par); + + hcb_wait_for_ack(par); + + /* set DS hi */ + par->ctl &= ~(HCB_NDS_BIT); + hcb_set_ctl(par); + + hcb_wait_for_ack_clear(par); +} + +void apollo_send_command(struct hecubafb_par *par, unsigned char data) +{ + /* command so set CD to high */ + par->ctl &= ~(HCB_NCD_BIT); + hcb_set_ctl(par); + + /* actually strobe with command */ + apollo_send_data(par, data); + + /* clear CD back to low */ + par->ctl |= (HCB_NCD_BIT); + hcb_set_ctl(par); +} + +/* main hecubafb functions */ + +static void hecubafb_dpy_update(struct hecubafb_par *par) +{ + int i; + unsigned char *buf = par->info->screen_base; + + apollo_send_command(par, 0xA0); + + for (i=0; i < (DPY_W*DPY_H/8); i++) { + apollo_send_data(par, *(buf++)); + } + + apollo_send_command(par, 0xA1); + apollo_send_command(par, 0xA2); +} + +/* this is called back from the deferred io workqueue */ +static void hecubafb_dpy_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + hecubafb_dpy_update(info->par); +} + +static void hecubafb_fillrect(struct fb_info *info, + const struct fb_fillrect *rect) +{ + struct hecubafb_par *par = info->par; + + cfb_fillrect(info, rect); + + hecubafb_dpy_update(par); +} + +static void hecubafb_copyarea(struct fb_info *info, + const struct fb_copyarea *area) +{ + struct hecubafb_par *par = info->par; + + cfb_copyarea(info, area); + + hecubafb_dpy_update(par); +} + +static void hecubafb_imageblit(struct fb_info *info, + const struct fb_image *image) +{ + struct hecubafb_par *par = info->par; + + cfb_imageblit(info, image); + + hecubafb_dpy_update(par); +} + +/* + * this is the slow path from userspace. they can seek and write to + * the fb. it's inefficient to do anything less than a full screen draw + */ +static ssize_t hecubafb_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct inode *inode; + int fbidx; + struct fb_info *info; + unsigned long p; + int err=-EINVAL; + struct hecubafb_par *par; + unsigned int xres; + unsigned int fbmemlength; + + p = *ppos; + inode = file->f_dentry->d_inode; + fbidx = iminor(inode); + info = registered_fb[fbidx]; + + if (!info || !info->screen_base) + return -ENODEV; + + par = info->par; + xres = info->var.xres; + fbmemlength = (xres * info->var.yres)/8; + + if (p > fbmemlength) + return -ENOSPC; + + err = 0; + if ((count + p) > fbmemlength) { + count = fbmemlength - p; + err = -ENOSPC; + } + + if (count) { + char *base_addr; + + base_addr = info->screen_base; + count -= copy_from_user(base_addr + p, buf, count); + *ppos += count; + err = -EFAULT; + } + + hecubafb_dpy_update(par); + + if (count) + return count; + + return err; +} + +/* this is to find and return the vmalloc-ed fb pages */ +static struct page* hecubafb_vm_nopage(struct vm_area_struct *vma, + unsigned long vaddr, int *type) +{ + unsigned long offset; + struct page *page; + struct fb_info *info = vma->vm_private_data; + + offset = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT); + if (offset >= (DPY_W*DPY_H)/8) + return NOPAGE_SIGBUS; + + page = vmalloc_to_page(info->screen_base + offset); + if (!page) + return NOPAGE_OOM; + + get_page(page); + if (type) + *type = VM_FAULT_MINOR; + return page; +} + +static struct vm_operations_struct hecubafb_vm_ops = { + .nopage = hecubafb_vm_nopage, + .page_mkwrite = fb_deferred_io_mkwrite, +}; + +static int hecubafb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + vma->vm_ops = &hecubafb_vm_ops; + vma->vm_flags |= ( VM_IO | VM_RESERVED | VM_DONTEXPAND ); + vma->vm_private_data = info; + return 0; +} + +static struct fb_ops hecubafb_ops = { + .owner = THIS_MODULE, + .fb_write = hecubafb_write, + .fb_fillrect = hecubafb_fillrect, + .fb_copyarea = hecubafb_copyarea, + .fb_imageblit = hecubafb_imageblit, + .fb_mmap = hecubafb_mmap, +}; + +static struct fb_deferred_io hecubafb_defio = { + .delay = HZ, + .deferred_io = hecubafb_dpy_deferred_io, +}; + +static int __devinit hecubafb_probe(struct platform_device *dev) +{ + struct fb_info *info; + int retval = -ENOMEM; + int videomemorysize; + unsigned char *videomemory; + struct hecubafb_par *par; + + videomemorysize = (DPY_W*DPY_H)/8; + + if (!(videomemory = vmalloc(videomemorysize))) + return retval; + + memset(videomemory, 0, videomemorysize); + + info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev); + if (!info) + goto err; + + info->screen_base = (char __iomem *) videomemory; + info->fbops = &hecubafb_ops; + + info->var = hecubafb_var; + info->fix = hecubafb_fix; + par = info->par; + par->info = info; + + if (!dio_addr || !cio_addr || !c2io_addr) { + printk(KERN_WARNING "no IO addresses supplied\n"); + goto err1; + } + par->dio_addr = dio_addr; + par->cio_addr = cio_addr; + par->c2io_addr = c2io_addr; + info->flags = FBINFO_FLAG_DEFAULT; + + info->fbdefio = &hecubafb_defio; + + retval = register_framebuffer(info); + if (retval < 0) + goto err1; + platform_set_drvdata(dev, info); + + printk(KERN_INFO + "fb%d: Hecuba frame buffer device, using %dK of video memory\n", + info->node, videomemorysize >> 10); + + /* this inits the dpy */ + apollo_init_control(par); + + apollo_send_command(par, APOLLO_INIT_DISPLAY); + apollo_send_data(par, 0x81); + + /* have to wait while display resets */ + udelay(1000); + + /* if we were told to splash the screen, we just clear it */ + if (!nosplash) { + apollo_send_command(par, APOLLO_ERASE_DISPLAY); + apollo_send_data(par, splashval); + } + + return 0; +err1: + framebuffer_release(info); +err: + vfree(videomemory); + return retval; +} + +static int __devexit hecubafb_remove(struct platform_device *dev) +{ + struct fb_info *info = platform_get_drvdata(dev); + + if (info) { + unregister_framebuffer(info); + vfree(info->screen_base); + framebuffer_release(info); + } + return 0; +} + +static struct platform_driver hecubafb_driver = { + .probe = hecubafb_probe, + .remove = hecubafb_remove, + .driver = { + .name = "hecubafb", + }, +}; + +static struct platform_device *hecubafb_device; + +static int __init hecubafb_init(void) +{ + int ret; + + if (!hecubafb_enable) { + printk(KERN_ERR "Use hecubafb_enable to enable the device\n"); + return -ENXIO; + } + + ret = platform_driver_register(&hecubafb_driver); + if (!ret) { + hecubafb_device = platform_device_alloc("hecubafb", 0); + if (hecubafb_device) + ret = platform_device_add(hecubafb_device); + else + ret = -ENOMEM; + + if (ret) { + platform_device_put(hecubafb_device); + platform_driver_unregister(&hecubafb_driver); + } + } + return ret; + +} + +static void __exit hecubafb_exit(void) +{ + platform_device_unregister(hecubafb_device); + platform_driver_unregister(&hecubafb_driver); +} + +module_param(nosplash, uint, 0); +MODULE_PARM_DESC(nosplash, "Disable doing the splash screen"); +module_param(hecubafb_enable, uint, 0); +MODULE_PARM_DESC(hecubafb_enable, "Enable communication with Hecuba board"); +module_param(dio_addr, ulong, 0); +MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480"); +module_param(cio_addr, ulong, 0); +MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400"); +module_param(c2io_addr, ulong, 0); +MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408"); +module_param(splashval, ulong, 0); +MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white"); +module_param(irq, uint, 0); +MODULE_PARM_DESC(irq, "IRQ for the Hecuba board"); + +module_init(hecubafb_init); +module_exit(hecubafb_exit); + +MODULE_DESCRIPTION("fbdev driver for Hecuba board"); +MODULE_AUTHOR("Jaya Kumar"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/fb.h b/include/linux/fb.h index a78e256..88a6c53 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -559,6 +559,16 @@ struct fb_pixmap { void (*readio) (struct fb_info *info, void *dst, void __iomem *src, unsigned int size); }; +#ifdef CONFIG_FB_DEFERRED_IO +struct fb_deferred_io { + /* delay between mkwrite and deferred handler */ + unsigned long delay; + struct mutex lock; /* mutex that protects the page list */ + struct list_head pagelist; /* list of touched pages */ + /* callback */ + void (*deferred_io)(struct fb_info *info, struct list_head *pagelist); +}; +#endif /* * Frame buffer operations @@ -779,6 +789,10 @@ struct fb_info { /* Backlight level curve */ u8 bl_curve[FB_BACKLIGHT_LEVELS]; #endif +#ifdef CONFIG_FB_DEFERRED_IO + struct delayed_work deferred_work; + struct fb_deferred_io *fbdefio; +#endif struct fb_ops *fbops; struct device *device; /* This is the parent */ @@ -914,6 +928,17 @@ static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, } } +#ifdef CONFIG_FB_DEFERRED_IO +/* drivers/video/fb_defio.c */ +extern void fb_deferred_io_init(struct fb_info *info); +extern void fb_deferred_io_cleanup(struct fb_info *info); +extern int fb_deferred_io_mkwrite(struct vm_area_struct *vma, + struct page *page); +#else +#define fb_deferred_io_init(fb_info) do { } while (0) +#define fb_deferred_io_cleanup(fb_info) do { } while (0) +#endif + /* drivers/video/fbsysfs.c */ extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev); extern void framebuffer_release(struct fb_info *info); diff --git a/mm/rmap.c b/mm/rmap.c index 669acb2..0fa0521 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -496,6 +496,7 @@ int page_mkclean(struct page *page) return ret; } +EXPORT_SYMBOL_GPL(page_mkclean); /** * page_set_anon_rmap - setup new anonymous rmap - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/