fbdev: hecuba Framebuffer Driver
This patch implements support for the E-Ink/hecuba display device. It uses deferred IO support. [akpm@linux-foundation.org: linker section fixes] Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jaya Kumar
Linus Torvalds
parent
5e841b88d2
commit
aad09e51ee
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@ -557,6 +557,20 @@ config FB_IMAC
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help
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This is the frame buffer device driver for the Intel-based Macintosh
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config FB_HECUBA
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tristate "Hecuba board support"
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depends on FB && X86 && MMU
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select FB_CFB_FILLRECT
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select FB_CFB_COPYAREA
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select FB_CFB_IMAGEBLIT
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select FB_DEFERRED_IO
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help
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This enables support for the Hecuba board. This driver was tested
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with an E-Ink 800x600 display and x86 SBCs through a 16 bit GPIO
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interface (8 bit data, 4 bit control). If you anticpate using
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this driver, say Y or M; otherwise say N. You must specify the
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GPIO IO address to be used for setting control and data.
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config FB_HGA
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tristate "Hercules mono graphics support"
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depends on FB && X86
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@ -67,6 +67,7 @@ obj-$(CONFIG_FB_ACORN) += acornfb.o
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obj-$(CONFIG_FB_ATARI) += atafb.o c2p.o atafb_mfb.o \
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atafb_iplan2p2.o atafb_iplan2p4.o atafb_iplan2p8.o
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obj-$(CONFIG_FB_MAC) += macfb.o
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obj-$(CONFIG_FB_HECUBA) += hecubafb.o
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obj-$(CONFIG_FB_HGA) += hgafb.o
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obj-$(CONFIG_FB_XVR500) += sunxvr500.o
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obj-$(CONFIG_FB_XVR2500) += sunxvr2500.o
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@ -0,0 +1,480 @@
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/*
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* linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller
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*
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* Copyright (C) 2006, Jaya Kumar
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* This work was sponsored by CIS(M) Sdn Bhd
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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* This work was possible because of apollo display code from E-Ink's website
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* http://support.eink.com/community
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* All information used to write this code is from public material made
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* available by E-Ink on its support site. Some commands such as 0xA4
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* were found by looping through cmd=0x00 thru 0xFF and supplying random
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* values. There are other commands that the display is capable of,
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* beyond the 5 used here but they are more complex.
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*
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* This driver is written to be used with the Hecuba display controller
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* board, and tested with the EInk 800x600 display in 1 bit mode.
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* The interface between Hecuba and the host is TTL based GPIO. The
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* GPIO requirements are 8 writable data lines and 6 lines for control.
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* Only 4 of the controls are actually used here but 6 for future use.
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* The driver requires the IO addresses for data and control GPIO at
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* load time. It is also possible to use this display with a standard
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* PC parallel port.
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*
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* General notes:
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* - User must set hecubafb_enable=1 to enable it
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* - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <asm/uaccess.h>
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/* Apollo controller specific defines */
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#define APOLLO_START_NEW_IMG 0xA0
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#define APOLLO_STOP_IMG_DATA 0xA1
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#define APOLLO_DISPLAY_IMG 0xA2
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#define APOLLO_ERASE_DISPLAY 0xA3
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#define APOLLO_INIT_DISPLAY 0xA4
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/* Hecuba interface specific defines */
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/* WUP is inverted, CD is inverted, DS is inverted */
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#define HCB_NWUP_BIT 0x01
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#define HCB_NDS_BIT 0x02
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#define HCB_RW_BIT 0x04
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#define HCB_NCD_BIT 0x08
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#define HCB_ACK_BIT 0x80
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/* Display specific information */
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#define DPY_W 600
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#define DPY_H 800
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struct hecubafb_par {
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unsigned long dio_addr;
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unsigned long cio_addr;
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unsigned long c2io_addr;
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unsigned char ctl;
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struct fb_info *info;
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unsigned int irq;
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};
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static struct fb_fix_screeninfo hecubafb_fix __devinitdata = {
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.id = "hecubafb",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO01,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.accel = FB_ACCEL_NONE,
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};
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static struct fb_var_screeninfo hecubafb_var __devinitdata = {
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.xres = DPY_W,
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.yres = DPY_H,
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.xres_virtual = DPY_W,
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.yres_virtual = DPY_H,
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.bits_per_pixel = 1,
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.nonstd = 1,
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};
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static unsigned long dio_addr;
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static unsigned long cio_addr;
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static unsigned long c2io_addr;
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static unsigned long splashval;
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static unsigned int nosplash;
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static unsigned int hecubafb_enable;
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static unsigned int irq;
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static DECLARE_WAIT_QUEUE_HEAD(hecubafb_waitq);
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static void hcb_set_ctl(struct hecubafb_par *par)
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{
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outb(par->ctl, par->cio_addr);
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}
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static unsigned char hcb_get_ctl(struct hecubafb_par *par)
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{
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return inb(par->c2io_addr);
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}
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static void hcb_set_data(struct hecubafb_par *par, unsigned char value)
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{
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outb(value, par->dio_addr);
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}
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static int __devinit apollo_init_control(struct hecubafb_par *par)
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{
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unsigned char ctl;
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/* for init, we want the following setup to be set:
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WUP = lo
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ACK = hi
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DS = hi
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RW = hi
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CD = lo
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*/
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/* write WUP to lo, DS to hi, RW to hi, CD to lo */
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par->ctl = HCB_NWUP_BIT | HCB_RW_BIT | HCB_NCD_BIT ;
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par->ctl &= ~HCB_NDS_BIT;
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hcb_set_ctl(par);
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/* check ACK is not lo */
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ctl = hcb_get_ctl(par);
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if ((ctl & HCB_ACK_BIT)) {
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printk(KERN_ERR "Fail because ACK is already low\n");
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return -ENXIO;
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}
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return 0;
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}
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void hcb_wait_for_ack(struct hecubafb_par *par)
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{
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int timeout;
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unsigned char ctl;
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timeout=500;
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do {
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ctl = hcb_get_ctl(par);
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if ((ctl & HCB_ACK_BIT))
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return;
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udelay(1);
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} while (timeout--);
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printk(KERN_ERR "timed out waiting for ack\n");
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}
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void hcb_wait_for_ack_clear(struct hecubafb_par *par)
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{
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int timeout;
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unsigned char ctl;
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timeout=500;
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do {
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ctl = hcb_get_ctl(par);
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if (!(ctl & HCB_ACK_BIT))
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return;
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udelay(1);
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} while (timeout--);
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printk(KERN_ERR "timed out waiting for clear\n");
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}
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void apollo_send_data(struct hecubafb_par *par, unsigned char data)
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{
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/* set data */
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hcb_set_data(par, data);
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/* set DS low */
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par->ctl |= HCB_NDS_BIT;
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hcb_set_ctl(par);
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hcb_wait_for_ack(par);
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/* set DS hi */
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par->ctl &= ~(HCB_NDS_BIT);
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hcb_set_ctl(par);
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hcb_wait_for_ack_clear(par);
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}
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void apollo_send_command(struct hecubafb_par *par, unsigned char data)
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{
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/* command so set CD to high */
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par->ctl &= ~(HCB_NCD_BIT);
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hcb_set_ctl(par);
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/* actually strobe with command */
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apollo_send_data(par, data);
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/* clear CD back to low */
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par->ctl |= (HCB_NCD_BIT);
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hcb_set_ctl(par);
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}
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/* main hecubafb functions */
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static void hecubafb_dpy_update(struct hecubafb_par *par)
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{
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int i;
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unsigned char *buf = par->info->screen_base;
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apollo_send_command(par, 0xA0);
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for (i=0; i < (DPY_W*DPY_H/8); i++) {
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apollo_send_data(par, *(buf++));
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}
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apollo_send_command(par, 0xA1);
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apollo_send_command(par, 0xA2);
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}
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/* this is called back from the deferred io workqueue */
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static void hecubafb_dpy_deferred_io(struct fb_info *info,
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struct list_head *pagelist)
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{
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hecubafb_dpy_update(info->par);
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}
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static void hecubafb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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struct hecubafb_par *par = info->par;
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cfb_fillrect(info, rect);
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hecubafb_dpy_update(par);
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}
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static void hecubafb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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struct hecubafb_par *par = info->par;
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cfb_copyarea(info, area);
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hecubafb_dpy_update(par);
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}
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static void hecubafb_imageblit(struct fb_info *info,
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const struct fb_image *image)
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{
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struct hecubafb_par *par = info->par;
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cfb_imageblit(info, image);
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hecubafb_dpy_update(par);
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}
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/*
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* this is the slow path from userspace. they can seek and write to
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* the fb. it's inefficient to do anything less than a full screen draw
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*/
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static ssize_t hecubafb_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct inode *inode;
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int fbidx;
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struct fb_info *info;
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unsigned long p;
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int err=-EINVAL;
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struct hecubafb_par *par;
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unsigned int xres;
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unsigned int fbmemlength;
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p = *ppos;
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inode = file->f_dentry->d_inode;
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fbidx = iminor(inode);
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info = registered_fb[fbidx];
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if (!info || !info->screen_base)
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return -ENODEV;
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par = info->par;
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xres = info->var.xres;
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fbmemlength = (xres * info->var.yres)/8;
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if (p > fbmemlength)
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return -ENOSPC;
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err = 0;
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if ((count + p) > fbmemlength) {
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count = fbmemlength - p;
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err = -ENOSPC;
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}
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if (count) {
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char *base_addr;
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base_addr = info->screen_base;
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count -= copy_from_user(base_addr + p, buf, count);
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*ppos += count;
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err = -EFAULT;
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}
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hecubafb_dpy_update(par);
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if (count)
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return count;
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return err;
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}
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static struct fb_ops hecubafb_ops = {
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.owner = THIS_MODULE,
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.fb_write = hecubafb_write,
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.fb_fillrect = hecubafb_fillrect,
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.fb_copyarea = hecubafb_copyarea,
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.fb_imageblit = hecubafb_imageblit,
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};
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static struct fb_deferred_io hecubafb_defio = {
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.delay = HZ,
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.deferred_io = hecubafb_dpy_deferred_io,
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};
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static int __devinit hecubafb_probe(struct platform_device *dev)
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{
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struct fb_info *info;
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int retval = -ENOMEM;
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int videomemorysize;
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unsigned char *videomemory;
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struct hecubafb_par *par;
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videomemorysize = (DPY_W*DPY_H)/8;
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if (!(videomemory = vmalloc(videomemorysize)))
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return retval;
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memset(videomemory, 0, videomemorysize);
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info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
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if (!info)
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goto err;
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info->screen_base = (char __iomem *) videomemory;
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info->fbops = &hecubafb_ops;
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info->var = hecubafb_var;
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info->fix = hecubafb_fix;
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info->fix.smem_len = videomemorysize;
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par = info->par;
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par->info = info;
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if (!dio_addr || !cio_addr || !c2io_addr) {
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printk(KERN_WARNING "no IO addresses supplied\n");
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goto err1;
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}
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par->dio_addr = dio_addr;
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par->cio_addr = cio_addr;
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par->c2io_addr = c2io_addr;
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info->flags = FBINFO_FLAG_DEFAULT;
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info->fbdefio = &hecubafb_defio;
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fb_deferred_io_init(info);
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retval = register_framebuffer(info);
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if (retval < 0)
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goto err1;
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platform_set_drvdata(dev, info);
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printk(KERN_INFO
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"fb%d: Hecuba frame buffer device, using %dK of video memory\n",
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info->node, videomemorysize >> 10);
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/* this inits the dpy */
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apollo_init_control(par);
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apollo_send_command(par, APOLLO_INIT_DISPLAY);
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apollo_send_data(par, 0x81);
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/* have to wait while display resets */
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udelay(1000);
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/* if we were told to splash the screen, we just clear it */
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if (!nosplash) {
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apollo_send_command(par, APOLLO_ERASE_DISPLAY);
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apollo_send_data(par, splashval);
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}
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return 0;
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err1:
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framebuffer_release(info);
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err:
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vfree(videomemory);
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return retval;
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}
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static int __devexit hecubafb_remove(struct platform_device *dev)
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{
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struct fb_info *info = platform_get_drvdata(dev);
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if (info) {
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fb_deferred_io_cleanup(info);
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unregister_framebuffer(info);
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vfree(info->screen_base);
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framebuffer_release(info);
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}
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return 0;
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}
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static struct platform_driver hecubafb_driver = {
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.probe = hecubafb_probe,
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.remove = hecubafb_remove,
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.driver = {
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.name = "hecubafb",
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},
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};
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static struct platform_device *hecubafb_device;
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static int __init hecubafb_init(void)
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{
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int ret;
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if (!hecubafb_enable) {
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printk(KERN_ERR "Use hecubafb_enable to enable the device\n");
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return -ENXIO;
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}
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ret = platform_driver_register(&hecubafb_driver);
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if (!ret) {
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hecubafb_device = platform_device_alloc("hecubafb", 0);
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if (hecubafb_device)
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ret = platform_device_add(hecubafb_device);
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else
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ret = -ENOMEM;
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if (ret) {
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platform_device_put(hecubafb_device);
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platform_driver_unregister(&hecubafb_driver);
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}
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}
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return ret;
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|
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}
|
||||
|
||||
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");
|
||||
Loading…
Reference in New Issue