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https://github.com/AsahiLinux/u-boot
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74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
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* Control GPIO pins on the fly
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*
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* Copyright (c) 2008 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/blackfin.h>
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int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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if (argc != 3) {
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show_usage:
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printf("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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/* parse the behavior */
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ulong port_cmd = 0;
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switch (argv[1][0]) {
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case 'i': break;
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case 's': port_cmd = (PORTFIO_SET - PORTFIO); break;
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case 'c': port_cmd = (PORTFIO_CLEAR - PORTFIO); break;
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case 't': port_cmd = (PORTFIO_TOGGLE - PORTFIO); break;
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default: goto show_usage;
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}
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/* parse the pin with format: [p]<fgh><#> */
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const char *str_pin = argv[2];
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/* grab the [p]<fgh> portion */
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ulong port_base;
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if (*str_pin == 'p') ++str_pin;
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switch (*str_pin) {
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case 'f': port_base = PORTFIO; break;
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case 'g': port_base = PORTGIO; break;
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case 'h': port_base = PORTHIO; break;
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default: goto show_usage;
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}
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/* grab the <#> portion */
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ulong pin = simple_strtoul(str_pin+1, NULL, 10);
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ulong pin_mask = (1 << pin);
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if (pin > 15)
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goto show_usage;
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/* finally, let's do it: set direction and exec command */
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switch (*str_pin) {
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case 'f': bfin_write_PORTF_FER(bfin_read_PORTF_FER() & ~pin_mask); break;
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case 'g': bfin_write_PORTG_FER(bfin_read_PORTG_FER() & ~pin_mask); break;
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case 'h': bfin_write_PORTH_FER(bfin_read_PORTH_FER() & ~pin_mask); break;
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}
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ulong port_dir = port_base + (PORTFIO_DIR - PORTFIO);
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if (argv[1][0] == 'i')
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bfin_write16(port_dir, bfin_read16(port_dir) & ~pin_mask);
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else {
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bfin_write16(port_dir, bfin_read16(port_dir) | pin_mask);
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bfin_write16(port_base + port_cmd, pin_mask);
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}
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printf("gpio: pin %li on port %c has been %c\n", pin, *str_pin, argv[1][0]);
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return 0;
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}
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U_BOOT_CMD(gpio, 3, 0, do_gpio,
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"gpio - set/clear/toggle gpio output pins\n",
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"<s|c|t> <port><pin>\n"
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" - set/clear/toggle the specified pin\n");
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