1 files changed, 295 insertions, 0 deletions

diff --git a/drivers/video/fbdev/pmag-ba-fb.c b/drivers/video/fbdev/pmag-ba-fb.c
new file mode 100644
index 000000000000..914a52ba8477
--- /dev/null
+++ b/drivers/video/fbdev/pmag-ba-fb.c
@@ -0,0 +1,295 @@
+/*
+ *      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 <video/pmag-ba-fb.h>
+
+
+struct pmagbafb_par {
+        volatile void __iomem *mmio;
+        volatile u32 __iomem *dac;
+};
+
+
+static struct fb_var_screeninfo pmagbafb_defined = {
+        .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 = {
+        .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;
+
+        if (regno >= info->cmap.len)
+                return 1;
+
+        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 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_name(dev));
+                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_name(dev));
+                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_name(dev))) {
+                printk(KERN_ERR "%s: Cannot reserve FB region\n",
+                       dev_name(dev));
+                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_name(dev));
+                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_name(dev));
+                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_name(dev));
+                goto err_smem_map;
+        }
+
+        get_device(dev);
+
+        fb_info(info, "%s frame buffer device at %s\n",
+                info->fix.id, dev_name(dev));
+
+        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");