--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff