diff options
Diffstat (limited to 'tools/intel_vga_write.c')
| -rw-r--r-- | tools/intel_vga_write.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/tools/intel_vga_write.c b/tools/intel_vga_write.c new file mode 100644 index 000000000..effca462b --- /dev/null +++ b/tools/intel_vga_write.c @@ -0,0 +1,93 @@ +/* + * Copyright © 2013 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: + * Ville Syrjälä <ville.syrjala@linux.intel.com> + * + */ + +#include <assert.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/io.h> +#include "intel_gpu_tools.h" + +static void write_reg(uint32_t reg, uint8_t val, bool use_mmio) +{ + if (use_mmio) + *((volatile uint8_t *)mmio + reg) = val; + else + outb(val, reg); +} + +static void usage(const char *cmdname) +{ + printf("Usage: %s [-m] addr value\n", cmdname); + printf("\t -m : use MMIO instead of port IO\n"); + printf("\t addr,value : in 0xXXXX format\n"); +} + +int main(int argc, char *argv[]) +{ + bool use_mmio = false; + int ret = 0; + uint32_t reg, val; + int ch; + const char *cmdname = argv[0]; + + while ((ch = getopt(argc, argv, "m")) != -1) { + switch(ch) { + case 'm': + use_mmio = true; + break; + default: + break; + } + } + argc -= optind; + argv += optind; + + if (argc < 2) { + usage(cmdname); + return 1; + } + + sscanf(argv[0], "0x%x", ®); + sscanf(argv[1], "0x%x", &val); + + if (use_mmio) + intel_register_access_init(intel_get_pci_device(), 0); + else + assert(iopl(3) == 0); + + write_reg(reg, val, use_mmio); + + if (use_mmio) + intel_register_access_fini(); + else + iopl(0); + + return ret; +} + |