1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/video/wmt_ge_rops.c 4 * 5 * Accelerators for raster operations using WonderMedia Graphics Engine 6 * 7 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> 8 */ 9 10 #include <linux/export.h> 11 #include <linux/module.h> 12 #include <linux/fb.h> 13 #include <linux/io.h> 14 #include <linux/platform_device.h> 15 16 #include "wmt_ge_rops.h" 17 18 #define GE_COMMAND_OFF 0x00 19 #define GE_DEPTH_OFF 0x04 20 #define GE_HIGHCOLOR_OFF 0x08 21 #define GE_ROPCODE_OFF 0x14 22 #define GE_FIRE_OFF 0x18 23 #define GE_SRCBASE_OFF 0x20 24 #define GE_SRCDISPW_OFF 0x24 25 #define GE_SRCDISPH_OFF 0x28 26 #define GE_SRCAREAX_OFF 0x2c 27 #define GE_SRCAREAY_OFF 0x30 28 #define GE_SRCAREAW_OFF 0x34 29 #define GE_SRCAREAH_OFF 0x38 30 #define GE_DESTBASE_OFF 0x3c 31 #define GE_DESTDISPW_OFF 0x40 32 #define GE_DESTDISPH_OFF 0x44 33 #define GE_DESTAREAX_OFF 0x48 34 #define GE_DESTAREAY_OFF 0x4c 35 #define GE_DESTAREAW_OFF 0x50 36 #define GE_DESTAREAH_OFF 0x54 37 #define GE_PAT0C_OFF 0x88 /* Pattern 0 color */ 38 #define GE_ENABLE_OFF 0xec 39 #define GE_INTEN_OFF 0xf0 40 #define GE_STATUS_OFF 0xf8 41 42 static void __iomem *regbase; 43 44 /* from the spec it seems more like depth than bits per pixel */ 45 static inline unsigned long pixel_to_pat(u32 depth, u32 pixel, struct fb_info *p) 46 { 47 switch (depth) { 48 case 1: 49 return ~0ul*pixel; 50 case 2: 51 return ~0ul/3*pixel; 52 case 4: 53 return ~0ul/15*pixel; 54 case 8: 55 return ~0ul/255*pixel; 56 case 12: 57 case 15: 58 case 16: 59 return ~0ul/0xffff*pixel; 60 case 18: 61 case 24: 62 return 0x1000001ul*pixel; 63 case 32: 64 return pixel; 65 default: 66 fb_warn_once(p, "%s: unsupported pixelformat %d\n", __func__, depth); 67 return 0; 68 } 69 } 70 71 void wmt_ge_fillrect(struct fb_info *p, const struct fb_fillrect *rect) 72 { 73 unsigned long fg, pat; 74 75 if (p->state != FBINFO_STATE_RUNNING) 76 return; 77 78 if (p->fix.visual == FB_VISUAL_TRUECOLOR || 79 p->fix.visual == FB_VISUAL_DIRECTCOLOR) 80 fg = ((u32 *) (p->pseudo_palette))[rect->color]; 81 else 82 fg = rect->color; 83 84 pat = pixel_to_pat(p->var.bits_per_pixel, fg, p); 85 86 if (p->fbops->fb_sync) 87 p->fbops->fb_sync(p); 88 89 writel(p->var.bits_per_pixel == 32 ? 3 : 90 (p->var.bits_per_pixel == 8 ? 0 : 1), regbase + GE_DEPTH_OFF); 91 writel(p->var.bits_per_pixel == 15 ? 1 : 0, regbase + GE_HIGHCOLOR_OFF); 92 writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF); 93 writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF); 94 writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF); 95 writel(rect->dx, regbase + GE_DESTAREAX_OFF); 96 writel(rect->dy, regbase + GE_DESTAREAY_OFF); 97 writel(rect->width - 1, regbase + GE_DESTAREAW_OFF); 98 writel(rect->height - 1, regbase + GE_DESTAREAH_OFF); 99 100 writel(pat, regbase + GE_PAT0C_OFF); 101 writel(1, regbase + GE_COMMAND_OFF); 102 writel(rect->rop == ROP_XOR ? 0x5a : 0xf0, regbase + GE_ROPCODE_OFF); 103 writel(1, regbase + GE_FIRE_OFF); 104 } 105 EXPORT_SYMBOL_GPL(wmt_ge_fillrect); 106 107 void wmt_ge_copyarea(struct fb_info *p, const struct fb_copyarea *area) 108 { 109 if (p->state != FBINFO_STATE_RUNNING) 110 return; 111 112 if (p->fbops->fb_sync) 113 p->fbops->fb_sync(p); 114 115 writel(p->var.bits_per_pixel > 16 ? 3 : 116 (p->var.bits_per_pixel > 8 ? 1 : 0), regbase + GE_DEPTH_OFF); 117 118 writel(p->fix.smem_start, regbase + GE_SRCBASE_OFF); 119 writel(p->var.xres_virtual - 1, regbase + GE_SRCDISPW_OFF); 120 writel(p->var.yres_virtual - 1, regbase + GE_SRCDISPH_OFF); 121 writel(area->sx, regbase + GE_SRCAREAX_OFF); 122 writel(area->sy, regbase + GE_SRCAREAY_OFF); 123 writel(area->width - 1, regbase + GE_SRCAREAW_OFF); 124 writel(area->height - 1, regbase + GE_SRCAREAH_OFF); 125 126 writel(p->fix.smem_start, regbase + GE_DESTBASE_OFF); 127 writel(p->var.xres_virtual - 1, regbase + GE_DESTDISPW_OFF); 128 writel(p->var.yres_virtual - 1, regbase + GE_DESTDISPH_OFF); 129 writel(area->dx, regbase + GE_DESTAREAX_OFF); 130 writel(area->dy, regbase + GE_DESTAREAY_OFF); 131 writel(area->width - 1, regbase + GE_DESTAREAW_OFF); 132 writel(area->height - 1, regbase + GE_DESTAREAH_OFF); 133 134 writel(0xcc, regbase + GE_ROPCODE_OFF); 135 writel(1, regbase + GE_COMMAND_OFF); 136 writel(1, regbase + GE_FIRE_OFF); 137 } 138 EXPORT_SYMBOL_GPL(wmt_ge_copyarea); 139 140 int wmt_ge_sync(struct fb_info *p) 141 { 142 int loops = 5000000; 143 while ((readl(regbase + GE_STATUS_OFF) & 4) && --loops) 144 cpu_relax(); 145 return loops > 0 ? 0 : -EBUSY; 146 } 147 EXPORT_SYMBOL_GPL(wmt_ge_sync); 148 149 static int wmt_ge_rops_probe(struct platform_device *pdev) 150 { 151 struct resource *res; 152 153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 154 if (res == NULL) { 155 dev_err(&pdev->dev, "no I/O memory resource defined\n"); 156 return -ENODEV; 157 } 158 159 /* Only one ROP engine is presently supported. */ 160 if (unlikely(regbase)) { 161 WARN_ON(1); 162 return -EBUSY; 163 } 164 165 regbase = ioremap(res->start, resource_size(res)); 166 if (regbase == NULL) { 167 dev_err(&pdev->dev, "failed to map I/O memory\n"); 168 return -EBUSY; 169 } 170 171 writel(1, regbase + GE_ENABLE_OFF); 172 printk(KERN_INFO "Enabled support for WMT GE raster acceleration\n"); 173 174 return 0; 175 } 176 177 static void wmt_ge_rops_remove(struct platform_device *pdev) 178 { 179 iounmap(regbase); 180 } 181 182 static const struct of_device_id wmt_dt_ids[] = { 183 { .compatible = "wm,prizm-ge-rops", }, 184 { /* sentinel */ } 185 }; 186 187 static struct platform_driver wmt_ge_rops_driver = { 188 .probe = wmt_ge_rops_probe, 189 .remove = wmt_ge_rops_remove, 190 .driver = { 191 .name = "wmt_ge_rops", 192 .of_match_table = wmt_dt_ids, 193 }, 194 }; 195 196 module_platform_driver(wmt_ge_rops_driver); 197 198 MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); 199 MODULE_DESCRIPTION("Accelerators for raster operations using " 200 "WonderMedia Graphics Engine"); 201 MODULE_DEVICE_TABLE(of, wmt_dt_ids); 202