diff options
Diffstat (limited to 'drivers/video/fbdev/pmagb-b-fb.c')
| -rw-r--r-- | drivers/video/fbdev/pmagb-b-fb.c | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/drivers/video/fbdev/pmagb-b-fb.c b/drivers/video/fbdev/pmagb-b-fb.c new file mode 100644 index 0000000000..6432492467 --- /dev/null +++ b/drivers/video/fbdev/pmagb-b-fb.c @@ -0,0 +1,408 @@ +/* + * 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 <philb@gnu.org> 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 <engel@unix-ag.org>, + * Karsten Merker <merker@linuxtag.org> 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 <linux/compiler.h> +#include <linux/delay.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/pmagb-b-fb.h> + + +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 const struct fb_var_screeninfo pmagbbfb_defined = { + .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 const struct fb_fix_screeninfo pmagbbfb_fix = { + .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; + + 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 pmagbbfb_ops = { + .owner = THIS_MODULE, + FB_DEFAULT_IOMEM_OPS, + .fb_setcolreg = pmagbbfb_setcolreg, +}; + + +/* + * Turn the hardware cursor off. + */ +static void 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 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 pmagbbfb_osc_setup(struct fb_info *info) +{ + static unsigned int pmagbbfb_freqs[] = { + 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 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64) + 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] + + (pmagbbfb_freqs[i] + 128) / 256) { + par->osc1 = pmagbbfb_freqs[i]; + break; + } + + if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 || + par->osc1 - par->osc0 <= (par->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 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) + 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 = &pmagbbfb_ops; + info->fix = pmagbbfb_fix; + info->var = pmagbbfb_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->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(info->fix.smem_start, info->fix.smem_len); + if (!par->smem) { + printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); + 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_name(dev)); + 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); + + fb_info(info, "%s frame buffer device at %s\n", + info->fix.id, dev_name(dev)); + fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n", + 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 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 = 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"); |