Subversion Repositories test_project

/*

 *      linux/drivers/video/pmag-ba-fb.c

 *

 *      PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,

 *      derived from:

 *      "HP300 Topcat framebuffer support (derived from macfb of all things)

 *      Phil Blundell <philb@gnu.org> 1998", the original code can be

 *      found in the file hpfb.c in the same directory.

 *

 *      Based on digital document:

 *      "PMAG-BA TURBOchannel Color Frame Buffer

 *       Functional Specification", Revision 1.2, August 27, 1990

 *

 *      DECstation related code Copyright (C) 1999, 2000, 2001 by

 *      Michael Engel <engel@unix-ag.org>,

 *      Karsten Merker <merker@linuxtag.org> and

 *      Harald Koerfgen.

 *      Copyright (c) 2005, 2006  Maciej W. Rozycki

 *      Copyright (c) 2005  James Simmons

 *

 *      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 <linux/compiler.h>

#include <linux/errno.h>

#include <linux/fb.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/tc.h>

#include <linux/types.h>

#include <asm/io.h>

#include <asm/system.h>

#include <video/pmag-ba-fb.h>

struct pmagbafb_par {

        volatile void __iomem *mmio;

        volatile u32 __iomem *dac;

};

static struct fb_var_screeninfo pmagbafb_defined __initdata = {

        .xres           = 1024,

        .yres           = 864,

        .xres_virtual   = 1024,

        .yres_virtual   = 864,

        .bits_per_pixel = 8,

        .red.length     = 8,

        .green.length   = 8,

        .blue.length    = 8,

        .activate       = FB_ACTIVATE_NOW,

        .height         = -1,

        .width          = -1,

        .accel_flags    = FB_ACCEL_NONE,

        .pixclock       = 14452,

        .left_margin    = 116,

        .right_margin   = 12,

        .upper_margin   = 34,

        .lower_margin   = 12,

        .hsync_len      = 128,

        .vsync_len      = 3,

        .sync           = FB_SYNC_ON_GREEN,

        .vmode          = FB_VMODE_NONINTERLACED,

};

static struct fb_fix_screeninfo pmagbafb_fix __initdata = {

        .id             = "PMAG-BA",

        .smem_len       = (1024 * 1024),

        .type           = FB_TYPE_PACKED_PIXELS,

        .visual         = FB_VISUAL_PSEUDOCOLOR,

        .line_length    = 1024,

        .mmio_len       = PMAG_BA_SIZE - PMAG_BA_BT459,

};

static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)

{

        writeb(v, par->dac + reg / 4);

}

static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)

{

        return readb(par->dac + reg / 4);

}

/*

 * Set the palette.

 */

static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,

                              unsigned int green, unsigned int blue,

                              unsigned int transp, struct fb_info *info)

{

        struct pmagbafb_par *par = info->par;

        BUG_ON(regno >= info->cmap.len);

        red   >>= 8;    /* The cmap fields are 16 bits    */

        green >>= 8;    /* wide, but the hardware colormap */

        blue  >>= 8;    /* registers are only 8 bits wide */

        mb();

        dac_write(par, BT459_ADDR_LO, regno);

        dac_write(par, BT459_ADDR_HI, 0x00);

        wmb();

        dac_write(par, BT459_CMAP, red);

        wmb();

        dac_write(par, BT459_CMAP, green);

        wmb();

        dac_write(par, BT459_CMAP, blue);

        return 0;

}

static struct fb_ops pmagbafb_ops = {

        .owner          = THIS_MODULE,

        .fb_setcolreg   = pmagbafb_setcolreg,

        .fb_fillrect    = cfb_fillrect,

        .fb_copyarea    = cfb_copyarea,

        .fb_imageblit   = cfb_imageblit,

};

/*

 * Turn the hardware cursor off.

 */

static void __init pmagbafb_erase_cursor(struct fb_info *info)

{

        struct pmagbafb_par *par = info->par;

        mb();

        dac_write(par, BT459_ADDR_LO, 0x00);

        dac_write(par, BT459_ADDR_HI, 0x03);

        wmb();

        dac_write(par, BT459_DATA, 0x00);

}

static int __init pmagbafb_probe(struct device *dev)

{

        struct tc_dev *tdev = to_tc_dev(dev);

        resource_size_t start, len;

        struct fb_info *info;

        struct pmagbafb_par *par;

        int err;

        info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);

        if (!info) {

                printk(KERN_ERR "%s: Cannot allocate memory\n", dev->bus_id);

                return -ENOMEM;

        }

        par = info->par;

        dev_set_drvdata(dev, info);

        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {

                printk(KERN_ERR "%s: Cannot allocate color map\n",

                       dev->bus_id);

                err = -ENOMEM;

                goto err_alloc;

        }

        info->fbops = &pmagbafb_ops;

        info->fix = pmagbafb_fix;

        info->var = pmagbafb_defined;

        info->flags = FBINFO_DEFAULT;

        /* Request the I/O MEM resource.  */

        start = tdev->resource.start;

        len = tdev->resource.end - start + 1;

        if (!request_mem_region(start, len, dev->bus_id)) {

                printk(KERN_ERR "%s: Cannot reserve FB region\n", dev->bus_id);

                err = -EBUSY;

                goto err_cmap;

        }

        /* MMIO mapping setup.  */

        info->fix.mmio_start = start;

        par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);

        if (!par->mmio) {

                printk(KERN_ERR "%s: Cannot map MMIO\n", dev->bus_id);

                err = -ENOMEM;

                goto err_resource;

        }

        par->dac = par->mmio + PMAG_BA_BT459;

        /* Frame buffer mapping setup.  */

        info->fix.smem_start = start + PMAG_BA_FBMEM;

        info->screen_base = ioremap_nocache(info->fix.smem_start,

                                            info->fix.smem_len);

        if (!info->screen_base) {

                printk(KERN_ERR "%s: Cannot map FB\n", dev->bus_id);

                err = -ENOMEM;

                goto err_mmio_map;

        }

        info->screen_size = info->fix.smem_len;

        pmagbafb_erase_cursor(info);

        err = register_framebuffer(info);

        if (err < 0) {

                printk(KERN_ERR "%s: Cannot register framebuffer\n",

                       dev->bus_id);

                goto err_smem_map;

        }

        get_device(dev);

        pr_info("fb%d: %s frame buffer device at %s\n",

                info->node, info->fix.id, dev->bus_id);

        return 0;

err_smem_map:

        iounmap(info->screen_base);

err_mmio_map:

        iounmap(par->mmio);

err_resource:

        release_mem_region(start, len);

err_cmap:

        fb_dealloc_cmap(&info->cmap);

err_alloc:

        framebuffer_release(info);

        return err;

}

static int __exit pmagbafb_remove(struct device *dev)

{

        struct tc_dev *tdev = to_tc_dev(dev);

        struct fb_info *info = dev_get_drvdata(dev);

        struct pmagbafb_par *par = info->par;

        resource_size_t start, len;

        put_device(dev);

        unregister_framebuffer(info);

        iounmap(info->screen_base);

        iounmap(par->mmio);

        start = tdev->resource.start;

        len = tdev->resource.end - start + 1;

        release_mem_region(start, len);

        fb_dealloc_cmap(&info->cmap);

        framebuffer_release(info);

        return 0;

}

/*

 * Initialize the framebuffer.

 */

static const struct tc_device_id pmagbafb_tc_table[] = {

        { "DEC     ", "PMAG-BA " },

        { }

};

MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);

static struct tc_driver pmagbafb_driver = {

        .id_table       = pmagbafb_tc_table,

        .driver         = {

                .name   = "pmagbafb",

                .bus    = &tc_bus_type,

                .probe  = pmagbafb_probe,

                .remove = __exit_p(pmagbafb_remove),

        },

};

static int __init pmagbafb_init(void)

{

#ifndef MODULE

        if (fb_get_options("pmagbafb", NULL))

                return -ENXIO;

#endif

        return tc_register_driver(&pmagbafb_driver);

}

static void __exit pmagbafb_exit(void)

{

        tc_unregister_driver(&pmagbafb_driver);

}

module_init(pmagbafb_init);

module_exit(pmagbafb_exit);

MODULE_LICENSE("GPL");