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1/*2 * linux/drivers/video/pmagb-b-fb.c3 *4 * PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support,5 * derived from:6 * "HP300 Topcat framebuffer support (derived from macfb of all things)7 * Phil Blundell <philb@gnu.org> 1998", the original code can be8 * found in the file hpfb.c in the same directory.9 *10 * DECstation related code Copyright (C) 1999, 2000, 2001 by11 * Michael Engel <engel@unix-ag.org>,12 * Karsten Merker <merker@linuxtag.org> and13 * Harald Koerfgen.14 * Copyright (c) 2005, 2006 Maciej W. Rozycki15 *16 * This file is subject to the terms and conditions of the GNU General17 * Public License. See the file COPYING in the main directory of this18 * archive for more details.19 */20 21#include <linux/compiler.h>22#include <linux/delay.h>23#include <linux/errno.h>24#include <linux/fb.h>25#include <linux/init.h>26#include <linux/kernel.h>27#include <linux/module.h>28#include <linux/tc.h>29#include <linux/types.h>30 31#include <asm/io.h>32 33#include <video/pmagb-b-fb.h>34 35 36struct pmagbbfb_par {37 volatile void __iomem *mmio;38 volatile void __iomem *smem;39 volatile u32 __iomem *sfb;40 volatile u32 __iomem *dac;41 unsigned int osc0;42 unsigned int osc1;43 int slot;44};45 46 47static const struct fb_var_screeninfo pmagbbfb_defined = {48 .bits_per_pixel = 8,49 .red.length = 8,50 .green.length = 8,51 .blue.length = 8,52 .activate = FB_ACTIVATE_NOW,53 .height = -1,54 .width = -1,55 .accel_flags = FB_ACCEL_NONE,56 .sync = FB_SYNC_ON_GREEN,57 .vmode = FB_VMODE_NONINTERLACED,58};59 60static const struct fb_fix_screeninfo pmagbbfb_fix = {61 .id = "PMAGB-BA",62 .smem_len = (2048 * 1024),63 .type = FB_TYPE_PACKED_PIXELS,64 .visual = FB_VISUAL_PSEUDOCOLOR,65 .mmio_len = PMAGB_B_FBMEM,66};67 68 69static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)70{71 writel(v, par->sfb + reg / 4);72}73 74static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)75{76 return readl(par->sfb + reg / 4);77}78 79static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)80{81 writeb(v, par->dac + reg / 4);82}83 84static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)85{86 return readb(par->dac + reg / 4);87}88 89static inline void gp0_write(struct pmagbbfb_par *par, u32 v)90{91 writel(v, par->mmio + PMAGB_B_GP0);92}93 94 95/*96 * Set the palette.97 */98static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,99 unsigned int green, unsigned int blue,100 unsigned int transp, struct fb_info *info)101{102 struct pmagbbfb_par *par = info->par;103 104 if (regno >= info->cmap.len)105 return 1;106 107 red >>= 8; /* The cmap fields are 16 bits */108 green >>= 8; /* wide, but the hardware colormap */109 blue >>= 8; /* registers are only 8 bits wide */110 111 mb();112 dac_write(par, BT459_ADDR_LO, regno);113 dac_write(par, BT459_ADDR_HI, 0x00);114 wmb();115 dac_write(par, BT459_CMAP, red);116 wmb();117 dac_write(par, BT459_CMAP, green);118 wmb();119 dac_write(par, BT459_CMAP, blue);120 121 return 0;122}123 124static const struct fb_ops pmagbbfb_ops = {125 .owner = THIS_MODULE,126 FB_DEFAULT_IOMEM_OPS,127 .fb_setcolreg = pmagbbfb_setcolreg,128};129 130 131/*132 * Turn the hardware cursor off.133 */134static void pmagbbfb_erase_cursor(struct fb_info *info)135{136 struct pmagbbfb_par *par = info->par;137 138 mb();139 dac_write(par, BT459_ADDR_LO, 0x00);140 dac_write(par, BT459_ADDR_HI, 0x03);141 wmb();142 dac_write(par, BT459_DATA, 0x00);143}144 145/*146 * Set up screen parameters.147 */148static void pmagbbfb_screen_setup(struct fb_info *info)149{150 struct pmagbbfb_par *par = info->par;151 152 info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >>153 SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4;154 info->var.xres_virtual = info->var.xres;155 info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >>156 SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK;157 info->var.yres_virtual = info->var.yres;158 info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>159 SFB_VID_HOR_BP_SHIFT) &160 SFB_VID_HOR_BP_MASK) * 4;161 info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>162 SFB_VID_HOR_FP_SHIFT) &163 SFB_VID_HOR_FP_MASK) * 4;164 info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >>165 SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK;166 info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >>167 SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK;168 info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >>169 SFB_VID_HOR_SYN_SHIFT) &170 SFB_VID_HOR_SYN_MASK) * 4;171 info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >>172 SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK;173 174 info->fix.line_length = info->var.xres;175};176 177/*178 * Determine oscillator configuration.179 */180static void pmagbbfb_osc_setup(struct fb_info *info)181{182 static unsigned int pmagbbfb_freqs[] = {183 130808, 119843, 104000, 92980, 74370, 72800,184 69197, 66000, 65000, 50350, 36000, 32000, 25175185 };186 struct pmagbbfb_par *par = info->par;187 struct tc_bus *tbus = to_tc_dev(info->device)->bus;188 u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8;189 u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250;190 int i, j;191 192 gp0_write(par, 0); /* select Osc0 */193 for (j = 0; j < 16; j++) {194 mb();195 sfb_write(par, SFB_REG_TCCLK_COUNT, 0);196 mb();197 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */198 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)199 break;200 udelay(1);201 }202 count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT);203 }204 205 gp0_write(par, 1); /* select Osc1 */206 for (j = 0; j < 16; j++) {207 mb();208 sfb_write(par, SFB_REG_TCCLK_COUNT, 0);209 210 for (i = 0; i < 100; i++) { /* nominally max. 20.5us */211 if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)212 break;213 udelay(1);214 }215 count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT);216 }217 218 freq0 = (freqtc * count0 + counttc / 2) / counttc;219 par->osc0 = freq0;220 if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 &&221 freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64)222 par->osc0 = pmagbbfb_freqs[0];223 224 freq1 = (par->osc0 * count1 + count0 / 2) / count0;225 par->osc1 = freq1;226 for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++)227 if (freq1 >= pmagbbfb_freqs[i] -228 (pmagbbfb_freqs[i] + 128) / 256 &&229 freq1 <= pmagbbfb_freqs[i] +230 (pmagbbfb_freqs[i] + 128) / 256) {231 par->osc1 = pmagbbfb_freqs[i];232 break;233 }234 235 if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 ||236 par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512)237 par->osc1 = 0;238 239 gp0_write(par, par->osc1 != 0); /* reselect OscX */240 241 info->var.pixclock = par->osc1 ?242 (1000000000 + par->osc1 / 2) / par->osc1 :243 (1000000000 + par->osc0 / 2) / par->osc0;244};245 246 247static int pmagbbfb_probe(struct device *dev)248{249 struct tc_dev *tdev = to_tc_dev(dev);250 resource_size_t start, len;251 struct fb_info *info;252 struct pmagbbfb_par *par;253 char freq0[12], freq1[12];254 u32 vid_base;255 int err;256 257 info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev);258 if (!info)259 return -ENOMEM;260 261 par = info->par;262 dev_set_drvdata(dev, info);263 264 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {265 printk(KERN_ERR "%s: Cannot allocate color map\n",266 dev_name(dev));267 err = -ENOMEM;268 goto err_alloc;269 }270 271 info->fbops = &pmagbbfb_ops;272 info->fix = pmagbbfb_fix;273 info->var = pmagbbfb_defined;274 275 /* Request the I/O MEM resource. */276 start = tdev->resource.start;277 len = tdev->resource.end - start + 1;278 if (!request_mem_region(start, len, dev_name(dev))) {279 printk(KERN_ERR "%s: Cannot reserve FB region\n",280 dev_name(dev));281 err = -EBUSY;282 goto err_cmap;283 }284 285 /* MMIO mapping setup. */286 info->fix.mmio_start = start;287 par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);288 if (!par->mmio) {289 printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));290 err = -ENOMEM;291 goto err_resource;292 }293 par->sfb = par->mmio + PMAGB_B_SFB;294 par->dac = par->mmio + PMAGB_B_BT459;295 296 /* Frame buffer mapping setup. */297 info->fix.smem_start = start + PMAGB_B_FBMEM;298 par->smem = ioremap(info->fix.smem_start, info->fix.smem_len);299 if (!par->smem) {300 printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));301 err = -ENOMEM;302 goto err_mmio_map;303 }304 vid_base = sfb_read(par, SFB_REG_VID_BASE);305 info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000;306 info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000;307 308 pmagbbfb_erase_cursor(info);309 pmagbbfb_screen_setup(info);310 pmagbbfb_osc_setup(info);311 312 err = register_framebuffer(info);313 if (err < 0) {314 printk(KERN_ERR "%s: Cannot register framebuffer\n",315 dev_name(dev));316 goto err_smem_map;317 }318 319 get_device(dev);320 321 snprintf(freq0, sizeof(freq0), "%u.%03uMHz",322 par->osc0 / 1000, par->osc0 % 1000);323 snprintf(freq1, sizeof(freq1), "%u.%03uMHz",324 par->osc1 / 1000, par->osc1 % 1000);325 326 fb_info(info, "%s frame buffer device at %s\n",327 info->fix.id, dev_name(dev));328 fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n",329 freq0, par->osc1 ? freq1 : "disabled", par->osc1 != 0);330 331 return 0;332 333 334err_smem_map:335 iounmap(par->smem);336 337err_mmio_map:338 iounmap(par->mmio);339 340err_resource:341 release_mem_region(start, len);342 343err_cmap:344 fb_dealloc_cmap(&info->cmap);345 346err_alloc:347 framebuffer_release(info);348 return err;349}350 351static int pmagbbfb_remove(struct device *dev)352{353 struct tc_dev *tdev = to_tc_dev(dev);354 struct fb_info *info = dev_get_drvdata(dev);355 struct pmagbbfb_par *par = info->par;356 resource_size_t start, len;357 358 put_device(dev);359 unregister_framebuffer(info);360 iounmap(par->smem);361 iounmap(par->mmio);362 start = tdev->resource.start;363 len = tdev->resource.end - start + 1;364 release_mem_region(start, len);365 fb_dealloc_cmap(&info->cmap);366 framebuffer_release(info);367 return 0;368}369 370 371/*372 * Initialize the framebuffer.373 */374static const struct tc_device_id pmagbbfb_tc_table[] = {375 { "DEC ", "PMAGB-BA" },376 { }377};378MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table);379 380static struct tc_driver pmagbbfb_driver = {381 .id_table = pmagbbfb_tc_table,382 .driver = {383 .name = "pmagbbfb",384 .bus = &tc_bus_type,385 .probe = pmagbbfb_probe,386 .remove = pmagbbfb_remove,387 },388};389 390static int __init pmagbbfb_init(void)391{392#ifndef MODULE393 if (fb_get_options("pmagbbfb", NULL))394 return -ENXIO;395#endif396 return tc_register_driver(&pmagbbfb_driver);397}398 399static void __exit pmagbbfb_exit(void)400{401 tc_unregister_driver(&pmagbbfb_driver);402}403 404 405module_init(pmagbbfb_init);406module_exit(pmagbbfb_exit);407 408MODULE_LICENSE("GPL");409