/* * linux/drivers/video/pmagb-b-fb.c * * PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support, * derived from: * "HP300 Topcat framebuffer support (derived from macfb of all things) * Phil Blundell 1998", the original code can be * found in the file hpfb.c in the same directory. * * DECstation related code Copyright (C) 1999, 2000, 2001 by * Michael Engel , * Karsten Merker and * Harald Koerfgen. * Copyright (c) 2005, 2006 Maciej W. Rozycki * * 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 #include #include #include #include #include #include #include #include #include #include #include struct pmagbbfb_par { volatile void __iomem *mmio; volatile void __iomem *smem; volatile u32 __iomem *sfb; volatile u32 __iomem *dac; unsigned int osc0; unsigned int osc1; int slot; }; static struct fb_var_screeninfo pmagbbfb_defined __initdata = { .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, .sync = FB_SYNC_ON_GREEN, .vmode = FB_VMODE_NONINTERLACED, }; static struct fb_fix_screeninfo pmagbbfb_fix __initdata = { .id = "PMAGB-BA", .smem_len = (2048 * 1024), .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_PSEUDOCOLOR, .mmio_len = PMAGB_B_FBMEM, }; static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v) { writel(v, par->sfb + reg / 4); } static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) { return readl(par->sfb + reg / 4); } static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v) { writeb(v, par->dac + reg / 4); } static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) { return readb(par->dac + reg / 4); } static inline void gp0_write(struct pmagbbfb_par *par, u32 v) { writel(v, par->mmio + PMAGB_B_GP0); } /* * Set the palette. */ static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info) { struct pmagbbfb_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 pmagbbfb_ops = { .owner = THIS_MODULE, .fb_setcolreg = pmagbbfb_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; /* * Turn the hardware cursor off. */ static void __init pmagbbfb_erase_cursor(struct fb_info *info) { struct pmagbbfb_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); } /* * Set up screen parameters. */ static void __init pmagbbfb_screen_setup(struct fb_info *info) { struct pmagbbfb_par *par = info->par; info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >> SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4; info->var.xres_virtual = info->var.xres; info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >> SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK; info->var.yres_virtual = info->var.yres; info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> SFB_VID_HOR_BP_SHIFT) & SFB_VID_HOR_BP_MASK) * 4; info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> SFB_VID_HOR_FP_SHIFT) & SFB_VID_HOR_FP_MASK) * 4; info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >> SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK; info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >> SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK; info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >> SFB_VID_HOR_SYN_SHIFT) & SFB_VID_HOR_SYN_MASK) * 4; info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >> SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK; info->fix.line_length = info->var.xres; }; /* * Determine oscillator configuration. */ static void __init pmagbbfb_osc_setup(struct fb_info *info) { static unsigned int pmagbbfb_freqs[] __initdata = { 130808, 119843, 104000, 92980, 74370, 72800, 69197, 66000, 65000, 50350, 36000, 32000, 25175 }; struct pmagbbfb_par *par = info->par; struct tc_bus *tbus = to_tc_dev(info->device)->bus; u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250; int i, j; gp0_write(par, 0); /* select Osc0 */ for (j = 0; j < 16; j++) { mb(); sfb_write(par, SFB_REG_TCCLK_COUNT, 0); mb(); for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) break; udelay(1); } count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT); } gp0_write(par, 1); /* select Osc1 */ for (j = 0; j < 16; j++) { mb(); sfb_write(par, SFB_REG_TCCLK_COUNT, 0); for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) break; udelay(1); } count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT); } freq0 = (freqtc * count0 + counttc / 2) / counttc; par->osc0 = freq0; if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 && freq0 par->osc0 = pmagbbfb_freqs[0]; freq1 = (par->osc0 * count1 + count0 / 2) / count0; par->osc1 = freq1; for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) if (freq1 >= pmagbbfb_freqs[i] - (pmagbbfb_freqs[i] + 128) / 256 && freq1 (pmagbbfb_freqs[i] + 128) / 256) { par->osc1 = pmagbbfb_freqs[i]; break; } if (par->osc0 - par->osc1 osc0 + par->osc1 + 256) / 512 || par->osc1 - par->osc0 osc0 + par->osc1 + 256) / 512) par->osc1 = 0; gp0_write(par, par->osc1 != 0); /* reselect OscX */ info->var.pixclock = par->osc1 ? (1000000000 + par->osc1 / 2) / par->osc1 : (1000000000 + par->osc0 / 2) / par->osc0; }; static int __init pmagbbfb_probe(struct device *dev) { struct tc_dev *tdev = to_tc_dev(dev); resource_size_t start, len; struct fb_info *info; struct pmagbbfb_par *par; char freq0[12], freq1[12]; u32 vid_base; int err; info = framebuffer_alloc(sizeof(struct pmagbbfb_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 = &pmagbbfb_ops; info->fix = pmagbbfb_fix; info->var = pmagbbfb_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->sfb = par->mmio + PMAGB_B_SFB; par->dac = par->mmio + PMAGB_B_BT459; /* Frame buffer mapping setup. */ info->fix.smem_start = start + PMAGB_B_FBMEM; par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); if (!par->smem) { printk(KERN_ERR "%s: Cannot map FB\n", dev->bus_id); err = -ENOMEM; goto err_mmio_map; } vid_base = sfb_read(par, SFB_REG_VID_BASE); info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; pmagbbfb_erase_cursor(info); pmagbbfb_screen_setup(info); pmagbbfb_osc_setup(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); snprintf(freq0, sizeof(freq0), "%u.%03uMHz", par->osc0 / 1000, par->osc0 % 1000); snprintf(freq1, sizeof(freq1), "%u.%03uMHz", par->osc1 / 1000, par->osc1 % 1000); pr_info("fb%d: %s frame buffer device at %s\n", info->node, info->fix.id, dev->bus_id); pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n", info->node, freq0, par->osc1 ? freq1 : "disabled", par->osc1 != 0); return 0; err_smem_map: iounmap(par->smem); 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 pmagbbfb_remove(struct device *dev) { struct tc_dev *tdev = to_tc_dev(dev); struct fb_info *info = dev_get_drvdata(dev); struct pmagbbfb_par *par = info->par; resource_size_t start, len; put_device(dev); unregister_framebuffer(info); iounmap(par->smem); 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 pmagbbfb_tc_table[] = { { "DEC ", "PMAGB-BA" }, { } }; MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); static struct tc_driver pmagbbfb_driver = { .id_table = pmagbbfb_tc_table, .driver = { .name = "pmagbbfb", .bus = &tc_bus_type, .probe = pmagbbfb_probe, .remove = __exit_p(pmagbbfb_remove), }, }; static int __init pmagbbfb_init(void) { #ifndef MODULE if (fb_get_options("pmagbbfb", NULL)) return -ENXIO; #endif return tc_register_driver(&pmagbbfb_driver); } static void __exit pmagbbfb_exit(void) { tc_unregister_driver(&pmagbbfb_driver); } module_init(pmagbbfb_init); module_exit(pmagbbfb_exit); MODULE_LICENSE("GPL");
