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