forked from Minki/linux
fbdev: platforming hecubafb and n411
This patch splits hecubafb into the platform independent hecubafb and the platform dependent n411. Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> 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
2422fbba06
commit
0e27aa3dab
@ -178,6 +178,11 @@ config FB_METRONOME
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depends on FB
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depends on FB_DEFERRED_IO
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config FB_HECUBA
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tristate
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depends on FB
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depends on FB_DEFERRED_IO
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config FB_SVGALIB
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tristate
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depends on FB
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@ -703,20 +708,18 @@ 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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config FB_N411
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tristate "N411 Apollo/Hecuba devkit support"
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depends on FB && X86 && MMU
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select FB_SYS_FILLRECT
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select FB_SYS_COPYAREA
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select FB_SYS_IMAGEBLIT
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select FB_SYS_FOPS
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select FB_DEFERRED_IO
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select FB_HECUBA
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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 anticipate 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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This enables support for the Apollo display controller in its
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Hecuba form using the n411 devkit.
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config FB_HGA
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tristate "Hercules mono graphics support"
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@ -1,5 +1,5 @@
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/*
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* linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller
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* linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo 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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@ -17,18 +17,13 @@
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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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* This driver is written to be used with the Hecuba display architecture.
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* The actual display chip is called Apollo and the interface electronics
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* it needs is called Hecuba.
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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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* It is intended to be architecture independent. A board specific driver
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* must be used to perform all the physical IO interactions. An example
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* is provided as n411.c
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*
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*/
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@ -47,34 +42,12 @@
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#include <linux/list.h>
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#include <linux/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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#include <video/hecubafb.h>
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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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@ -82,6 +55,7 @@ static struct fb_fix_screeninfo hecubafb_fix __devinitdata = {
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = DPY_W,
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.accel = FB_ACCEL_NONE,
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};
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@ -94,136 +68,51 @@ static struct fb_var_screeninfo hecubafb_var __devinitdata = {
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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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static 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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static 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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/* main hecubafb functions */
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static 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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par->board->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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par->board->set_ctl(par, HCB_DS_BIT, 0);
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hcb_wait_for_ack(par);
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/* wait for ack */
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par->board->wait_for_ack(par, 0);
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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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par->board->set_ctl(par, HCB_DS_BIT, 1);
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hcb_wait_for_ack_clear(par);
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/* wait for ack to clear */
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par->board->wait_for_ack(par, 1);
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}
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static 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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par->board->set_ctl(par, HCB_CD_BIT, 1);
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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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par->board->set_ctl(par, HCB_CD_BIT, 0);
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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 = (unsigned char __force *)par->info->screen_base;
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apollo_send_command(par, 0xA0);
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apollo_send_command(par, APOLLO_START_NEW_IMG);
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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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apollo_send_command(par, APOLLO_STOP_IMG_DATA);
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apollo_send_command(par, APOLLO_DISPLAY_IMG);
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}
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/* this is called back from the deferred io workqueue */
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@ -326,11 +215,21 @@ static struct fb_deferred_io hecubafb_defio = {
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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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struct hecuba_board *board;
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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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/* pick up board specific routines */
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board = dev->dev.platform_data;
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if (!board)
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return -EINVAL;
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/* try to count device specific driver, if can't, platform recalls */
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if (!try_module_get(board->owner))
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return -ENODEV;
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videomemorysize = (DPY_W*DPY_H)/8;
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if (!(videomemory = vmalloc(videomemorysize)))
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@ -340,9 +239,9 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
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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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goto err_fballoc;
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info->screen_base = (char __iomem *) videomemory;
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info->screen_base = (char __force __iomem *)videomemory;
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info->fbops = &hecubafb_ops;
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info->var = hecubafb_var;
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@ -350,14 +249,10 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
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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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par->board = board;
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par->send_command = apollo_send_command;
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par->send_data = apollo_send_data;
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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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@ -365,7 +260,7 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
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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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goto err_fbreg;
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platform_set_drvdata(dev, info);
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printk(KERN_INFO
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@ -373,25 +268,16 @@ static int __devinit hecubafb_probe(struct platform_device *dev)
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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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retval = par->board->init(par);
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if (retval < 0)
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goto err_fbreg;
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return 0;
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err1:
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err_fbreg:
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framebuffer_release(info);
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err:
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err_fballoc:
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vfree(videomemory);
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module_put(board->owner);
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return retval;
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}
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@ -400,9 +286,13 @@ static int __devexit hecubafb_remove(struct platform_device *dev)
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struct fb_info *info = platform_get_drvdata(dev);
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if (info) {
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struct hecubafb_par *par = info->par;
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fb_deferred_io_cleanup(info);
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unregister_framebuffer(info);
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vfree((void __force *)info->screen_base);
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if (par->board->remove)
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par->board->remove(par);
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module_put(par->board->owner);
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framebuffer_release(info);
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}
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return 0;
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@ -412,62 +302,24 @@ 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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.owner = THIS_MODULE,
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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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return platform_driver_register(&hecubafb_driver);
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}
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static void __exit hecubafb_exit(void)
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{
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platform_device_unregister(hecubafb_device);
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platform_driver_unregister(&hecubafb_driver);
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}
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module_param(nosplash, uint, 0);
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MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
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module_param(hecubafb_enable, uint, 0);
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MODULE_PARM_DESC(hecubafb_enable, "Enable communication with Hecuba board");
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module_param(dio_addr, ulong, 0);
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MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
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module_param(cio_addr, ulong, 0);
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MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
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module_param(c2io_addr, ulong, 0);
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MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
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module_param(splashval, ulong, 0);
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MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white");
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module_param(irq, uint, 0);
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MODULE_PARM_DESC(irq, "IRQ for the Hecuba board");
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module_init(hecubafb_init);
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module_exit(hecubafb_exit);
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MODULE_DESCRIPTION("fbdev driver for Hecuba board");
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MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
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MODULE_AUTHOR("Jaya Kumar");
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MODULE_LICENSE("GPL");
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202
drivers/video/n411.c
Normal file
202
drivers/video/n411.c
Normal file
@ -0,0 +1,202 @@
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/*
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* linux/drivers/video/n411.c -- Platform device for N411 EPD kit
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*
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* Copyright (C) 2008, Jaya Kumar
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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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*
|
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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.
|
||||
* 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.
|
||||
* 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 dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/fb.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/irq.h>
|
||||
|
||||
#include <video/hecubafb.h>
|
||||
|
||||
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 char ctl;
|
||||
|
||||
static void n411_set_ctl(struct hecubafb_par *par, unsigned char bit, unsigned
|
||||
char state)
|
||||
{
|
||||
switch (bit) {
|
||||
case HCB_CD_BIT:
|
||||
if (state)
|
||||
ctl &= ~(HCB_CD_BIT);
|
||||
else
|
||||
ctl |= HCB_CD_BIT;
|
||||
break;
|
||||
case HCB_DS_BIT:
|
||||
if (state)
|
||||
ctl &= ~(HCB_DS_BIT);
|
||||
else
|
||||
ctl |= HCB_DS_BIT;
|
||||
break;
|
||||
}
|
||||
outb(ctl, cio_addr);
|
||||
}
|
||||
|
||||
static unsigned char n411_get_ctl(struct hecubafb_par *par)
|
||||
{
|
||||
return inb(c2io_addr);
|
||||
}
|
||||
|
||||
static void n411_set_data(struct hecubafb_par *par, unsigned char value)
|
||||
{
|
||||
outb(value, dio_addr);
|
||||
}
|
||||
|
||||
static void n411_wait_for_ack(struct hecubafb_par *par, int clear)
|
||||
{
|
||||
int timeout;
|
||||
unsigned char tmp;
|
||||
|
||||
timeout = 500;
|
||||
do {
|
||||
tmp = n411_get_ctl(par);
|
||||
if ((tmp & HCB_ACK_BIT) && (!clear))
|
||||
return;
|
||||
else if (!(tmp & HCB_ACK_BIT) && (clear))
|
||||
return;
|
||||
udelay(1);
|
||||
} while (timeout--);
|
||||
printk(KERN_ERR "timed out waiting for ack\n");
|
||||
}
|
||||
|
||||
static int n411_init_control(struct hecubafb_par *par)
|
||||
{
|
||||
unsigned char tmp;
|
||||
/* 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 */
|
||||
ctl = HCB_WUP_BIT | HCB_RW_BIT | HCB_CD_BIT ;
|
||||
n411_set_ctl(par, HCB_DS_BIT, 1);
|
||||
|
||||
/* check ACK is not lo */
|
||||
tmp = n411_get_ctl(par);
|
||||
if (tmp & HCB_ACK_BIT) {
|
||||
printk(KERN_ERR "Fail because ACK is already low\n");
|
||||
return -ENXIO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static int n411_init_board(struct hecubafb_par *par)
|
||||
{
|
||||
int retval;
|
||||
|
||||
retval = n411_init_control(par);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
par->send_command(par, APOLLO_INIT_DISPLAY);
|
||||
par->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) {
|
||||
par->send_command(par, APOLLO_ERASE_DISPLAY);
|
||||
par->send_data(par, splashval);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct hecuba_board n411_board = {
|
||||
.owner = THIS_MODULE,
|
||||
.init = n411_init_board,
|
||||
.set_ctl = n411_set_ctl,
|
||||
.set_data = n411_set_data,
|
||||
.wait_for_ack = n411_wait_for_ack,
|
||||
};
|
||||
|
||||
static struct platform_device *n411_device;
|
||||
static int __init n411_init(void)
|
||||
{
|
||||
int ret;
|
||||
if (!dio_addr || !cio_addr || !c2io_addr) {
|
||||
printk(KERN_WARNING "no IO addresses supplied\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* request our platform independent driver */
|
||||
request_module("hecubafb");
|
||||
|
||||
n411_device = platform_device_alloc("hecubafb", -1);
|
||||
if (!n411_device)
|
||||
return -ENOMEM;
|
||||
|
||||
platform_device_add_data(n411_device, &n411_board, sizeof(n411_board));
|
||||
|
||||
/* this _add binds hecubafb to n411. hecubafb refcounts n411 */
|
||||
ret = platform_device_add(n411_device);
|
||||
|
||||
if (ret)
|
||||
platform_device_put(n411_device);
|
||||
|
||||
return ret;
|
||||
|
||||
}
|
||||
|
||||
static void __exit n411_exit(void)
|
||||
{
|
||||
platform_device_unregister(n411_device);
|
||||
}
|
||||
|
||||
module_init(n411_init);
|
||||
module_exit(n411_exit);
|
||||
|
||||
module_param(nosplash, uint, 0);
|
||||
MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
|
||||
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_DESCRIPTION("board driver for n411 hecuba/apollo epd kit");
|
||||
MODULE_AUTHOR("Jaya Kumar");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
51
include/video/hecubafb.h
Normal file
51
include/video/hecubafb.h
Normal file
@ -0,0 +1,51 @@
|
||||
/*
|
||||
* hecubafb.h - definitions for the hecuba framebuffer driver
|
||||
*
|
||||
* Copyright (C) 2008 by 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.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_HECUBAFB_H_
|
||||
#define _LINUX_HECUBAFB_H_
|
||||
|
||||
/* 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 */
|
||||
#define HCB_WUP_BIT 0x01
|
||||
#define HCB_DS_BIT 0x02
|
||||
#define HCB_RW_BIT 0x04
|
||||
#define HCB_CD_BIT 0x08
|
||||
#define HCB_ACK_BIT 0x80
|
||||
|
||||
/* struct used by hecuba. board specific stuff comes from *board */
|
||||
struct hecubafb_par {
|
||||
struct fb_info *info;
|
||||
struct hecuba_board *board;
|
||||
void (*send_command)(struct hecubafb_par *, unsigned char);
|
||||
void (*send_data)(struct hecubafb_par *, unsigned char);
|
||||
};
|
||||
|
||||
/* board specific routines
|
||||
board drivers can implement wait_for_ack with interrupts if desired. if
|
||||
wait_for_ack is called with clear=0, then go to sleep and return when ack
|
||||
goes hi or if wait_for_ack with clear=1, then return when ack goes lo */
|
||||
struct hecuba_board {
|
||||
struct module *owner;
|
||||
void (*remove)(struct hecubafb_par *);
|
||||
void (*set_ctl)(struct hecubafb_par *, unsigned char, unsigned char);
|
||||
void (*set_data)(struct hecubafb_par *, unsigned char);
|
||||
void (*wait_for_ack)(struct hecubafb_par *, int);
|
||||
int (*init)(struct hecubafb_par *);
|
||||
};
|
||||
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user