diff options
Diffstat (limited to 'drivers/video/fbdev/pmag-ba-fb.c')
| -rw-r--r-- | drivers/video/fbdev/pmag-ba-fb.c | 290 |
1 files changed, 290 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 0000000000..1e010520b3 --- /dev/null +++ b/drivers/video/fbdev/pmag-ba-fb.c @@ -0,0 +1,290 @@ +/* + * 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 const 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 = 0, + .hsync_len = 128, + .vsync_len = 3, + .sync = FB_SYNC_ON_GREEN, + .vmode = FB_VMODE_NONINTERLACED, +}; + +static const 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 const struct fb_ops pmagbafb_ops = { + .owner = THIS_MODULE, + FB_DEFAULT_IOMEM_OPS, + .fb_setcolreg = pmagbafb_setcolreg, +}; + + +/* + * Turn the hardware cursor off. + */ +static void 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) + 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; + + /* 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(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(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 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 = 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"); |