Timothy Pearson
10 years ago
parent
4123289a7a
commit
4436bddc8c
@ -0,0 +1,181 @@
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/*
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* Remote Laboratory FPGA Server GPMC Interface (Beaglebone Black)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* (c) 2012-2014 Timothy Pearson
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* Raptor Engineering
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* http://www.raptorengineeringinc.com
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*/
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/** BEGIN: Low-Level I/O Implementation **/
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// Beaglebone Black GPMC driver
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#include <sys/time.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#define MEMORY_SPACE_ADDRESS_BITS 16
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#define GPMC_BASE 0x50000000
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#define GPMC_REGLEN 0x10000000
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#define GPMC_CHIPSELECTCONFIGDISPLACEMENT (0x30 / 4)
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#define GPMC_CONFIG (0x50 / 4)
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#define GPMC_CONFIG1 (0x60 / 4)
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#define GPMC_CONFIG2 (0x64 / 4)
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#define GPMC_CONFIG3 (0x68 / 4)
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#define GPMC_CONFIG4 (0x6c / 4)
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#define GPMC_CONFIG5 (0x70 / 4)
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#define GPMC_CONFIG6 (0x74 / 4)
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#define GPMC_CONFIG7 (0x78 / 4)
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#define MEMORY_SIZE (1 << MEMORY_SPACE_ADDRESS_BITS)
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int mem_fd = 0;
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int gpmc_mem_fd = 0;
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char *gpio_mem, *gpio_map, *gpmc_map;
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// I/O access
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volatile unsigned int *gpio = NULL;
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volatile unsigned char *gpio_char = NULL;
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volatile unsigned int *gpmc = NULL;
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void gpmc_mapregisters() {
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/* open /dev/mem */
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if ((gpmc_mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0) {
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printf("[FATAL] can't open /dev/mem\n");
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return;
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}
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/* mmap GPMC */
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gpmc_map = (char *)mmap(
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0,
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GPMC_REGLEN,
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PROT_READ|PROT_WRITE,
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MAP_SHARED,
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gpmc_mem_fd,
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GPMC_BASE
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);
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if (gpmc_map == MAP_FAILED) {
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printf("[FATAL] mmap error %d\n", (int)gpmc_map);
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return;
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}
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// Always use volatile pointer!
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gpmc = (volatile unsigned *)gpmc_map;
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}
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void gpmc_unmapregisters() {
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munmap((void*) gpmc, GPMC_REGLEN);
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if (gpmc_mem_fd != -1) {
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close(gpmc_mem_fd);
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}
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}
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void gpmc_setup(void) {
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gpmc_mapregisters();
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if (gpmc != NULL) {
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int chipselect = 0;
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int displacement = GPMC_CHIPSELECTCONFIGDISPLACEMENT * chipselect;
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// disable before playing with the registers
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*(gpmc + displacement + GPMC_CONFIG7) = 0x00000000;
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*(gpmc + displacement + GPMC_CONFIG) = 0x00000000; // Unlimited address space
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*(gpmc + displacement + GPMC_CONFIG1) = 0x00000000; // No burst, async, 8-bit, non multiplexed
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*(gpmc + displacement + GPMC_CONFIG2) = 0x00001000; // Assert CS on fclk0, deassert CS on fclk16
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*(gpmc + displacement + GPMC_CONFIG3) = 0x00000400; // Assert ADV on fclk 0, deassert ADV on fclk 4
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*(gpmc + displacement + GPMC_CONFIG4) = 0x0c041004; // Assert WE on fclk4, deassert WE on fclk12, assert OE on fclk4, deassert OE on fclk16
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*(gpmc + displacement + GPMC_CONFIG5) = 0x000c1010; // Data valid on fclk 12, cycle time 16 fclks
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*(gpmc + displacement + GPMC_CONFIG6) = 0x00000000; // No back to back cycle restrictions
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*(gpmc + displacement + GPMC_CONFIG7) = 0x00000e50; // CS0: Set base address 0x10000000, 32MB region, and enable CS
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gpmc_unmapregisters();
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}
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}
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int setup_gpmc_bbb(void) {
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/* open /dev/mem */
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if ((mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0) {
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printf("[FATAL] can't open /dev/mem\n");
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return -1;
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}
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/* mmap GPIO */
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gpio_map = (char *)mmap(
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0,
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MEMORY_SIZE,
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PROT_READ|PROT_WRITE,
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MAP_SHARED,
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mem_fd,
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0x10000000
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);
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if (gpio_map == MAP_FAILED) {
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printf("[FATAL] mmap error %d\n", (int)gpio_map);
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return -1;
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}
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// Always use volatile pointers!
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gpio = (volatile unsigned *)gpio_map;
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gpio_char = (volatile unsigned char *)gpio_map;
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return 0;
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}
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int shutdown_gpmc_bbb(void) {
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return 0;
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}
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void write_gpmc(unsigned int register_offset, unsigned char data) {
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*(gpio_char + register_offset) = data;
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}
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unsigned char read_gpmc(unsigned int register_offset) {
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return *(gpio_char + register_offset);
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}
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void memcpy_from_gpmc(char* destination, unsigned int register_offset, unsigned int length) {
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unsigned int i;
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for (i=0; i<length; i++) {
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*destination = *(gpio_char + register_offset);
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destination++;
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register_offset++;
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}
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}
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void memcpy_to_gpmc(char* source, unsigned int register_offset, unsigned int length) {
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unsigned int i;
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for (i=0; i<length; i++) {
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*(gpio_char + register_offset) = *source;
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source++;
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register_offset++;
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}
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}
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/** END: Low-Level I/O Implementation **/
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@ -0,0 +1,28 @@
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/*
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* Remote Laboratory FPGA Server GPMC Interface (Beaglebone Black)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* (c) 2012-2014 Timothy Pearson
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* Raptor Engineering
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* http://www.raptorengineeringinc.com
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*/
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int setup_gpmc_bbb();
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void write_gpmc(unsigned int register_offset, unsigned char data);
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unsigned char read_gpmc(unsigned int register_offset);
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void memcpy_from_gpmc(char* destination, unsigned int register_offset, unsigned int length);
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void memcpy_to_gpmc(char* source, unsigned int register_offset, unsigned int length);
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