50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Brian Sune <briansune@gmail.com>
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*/
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#include <vsprintf.h>
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#include <command.h>
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#include <asm/io.h>
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#include <asm/arch/base_addr_ac5.h>
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#define RSTMGR_PERMODRST 0x18 /* PERMODRST register offset */
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static int do_dmareset(struct cmd_tbl *cmdtp, int flag, int argc,
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char * const argv[])
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{
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u8 val;
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int i, ch;
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if (argc < 2) {
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printf("Usage: dmareset <channel 0-7> [<channel 0-7> ...]\n");
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return CMD_RET_USAGE;
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}
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/* Read current register value */
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val = readb(SOCFPGA_RSTMGR_ADDRESS + RSTMGR_PERMODRST);
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/* Iterate over all channels given as arguments */
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for (i = 1; i < argc; i++) {
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ch = simple_strtoul(argv[i], NULL, 0);
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if (ch < 0 || ch > 7) {
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printf("Error: channel must be 0-7\n");
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return CMD_RET_USAGE;
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}
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val &= ~(1 << ch);
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printf("PL330 DMA channel %d reset released\n", ch);
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}
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/* Write back */
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writeb(val, (SOCFPGA_RSTMGR_ADDRESS + RSTMGR_PERMODRST));
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return 0;
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}
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U_BOOT_CMD(
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dmareset, 8, 0, do_dmareset,
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"Release PL330 DMA channel reset(s) for SoCFPGA",
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"dmareset <channel 0-7> [<channel 0-7> ...] - release reset for one or more DMA channels"
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);
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