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https://github.com/AsahiLinux/u-boot
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a877bec3ec
This function will be needed by the upcoming Designware master SPI driver. As the SPI master controller is held in reset by the current Preloader implementation. So we need to release the reset for the driver to communicate with the controller. This function is called from arch_early_init_r() if the SPI driver is enabled. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Chin Liang See <clsee@altera.com> Cc: Dinh Nguyen <dinguyen@altera.com> Cc: Vince Bridgers <vbridger@altera.com> Cc: Marek Vasut <marex@denx.de> Cc: Pavel Machek <pavel@denx.de>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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* Copyright (C) 2013 Altera Corporation <www.altera.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/reset_manager.h>
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#include <asm/arch/fpga_manager.h>
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DECLARE_GLOBAL_DATA_PTR;
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static const struct socfpga_reset_manager *reset_manager_base =
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(void *)SOCFPGA_RSTMGR_ADDRESS;
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/* Toggle reset signal to watchdog (WDT is disabled after this operation!) */
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void socfpga_watchdog_reset(void)
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{
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/* assert reset for watchdog */
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setbits_le32(&reset_manager_base->per_mod_reset,
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1 << RSTMGR_PERMODRST_L4WD0_LSB);
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/* deassert watchdog from reset (watchdog in not running state) */
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clrbits_le32(&reset_manager_base->per_mod_reset,
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1 << RSTMGR_PERMODRST_L4WD0_LSB);
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}
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/*
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* Write the reset manager register to cause reset
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*/
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void reset_cpu(ulong addr)
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{
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/* request a warm reset */
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writel((1 << RSTMGR_CTRL_SWWARMRSTREQ_LSB),
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&reset_manager_base->ctrl);
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/*
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* infinite loop here as watchdog will trigger and reset
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* the processor
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*/
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while (1)
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;
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}
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/*
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* Release peripherals from reset based on handoff
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*/
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void reset_deassert_peripherals_handoff(void)
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{
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writel(0, &reset_manager_base->per_mod_reset);
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}
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#if defined(CONFIG_SOCFPGA_VIRTUAL_TARGET)
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void socfpga_bridges_reset(int enable)
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{
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/* For SoCFPGA-VT, this is NOP. */
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}
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#else
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#define L3REGS_REMAP_LWHPS2FPGA_MASK 0x10
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#define L3REGS_REMAP_HPS2FPGA_MASK 0x08
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#define L3REGS_REMAP_OCRAM_MASK 0x01
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void socfpga_bridges_reset(int enable)
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{
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const uint32_t l3mask = L3REGS_REMAP_LWHPS2FPGA_MASK |
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L3REGS_REMAP_HPS2FPGA_MASK |
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L3REGS_REMAP_OCRAM_MASK;
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if (enable) {
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/* brdmodrst */
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writel(0xffffffff, &reset_manager_base->brg_mod_reset);
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} else {
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/* Check signal from FPGA. */
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if (fpgamgr_poll_fpga_ready()) {
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/* FPGA not ready. Wait for watchdog timeout. */
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printf("%s: fpga not ready, hanging.\n", __func__);
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hang();
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}
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/* brdmodrst */
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writel(0, &reset_manager_base->brg_mod_reset);
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/* Remap the bridges into memory map */
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writel(l3mask, SOCFPGA_L3REGS_ADDRESS);
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}
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}
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#endif
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/* Change the reset state for EMAC 0 and EMAC 1 */
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void socfpga_emac_reset(int enable)
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{
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const void *reset = &reset_manager_base->per_mod_reset;
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if (enable) {
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setbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC0_LSB);
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setbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC1_LSB);
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} else {
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#if (CONFIG_EMAC_BASE == SOCFPGA_EMAC0_ADDRESS)
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clrbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC0_LSB);
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#elif (CONFIG_EMAC_BASE == SOCFPGA_EMAC1_ADDRESS)
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clrbits_le32(reset, 1 << RSTMGR_PERMODRST_EMAC1_LSB);
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#endif
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}
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}
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/* SPI Master enable (its held in reset by the preloader) */
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void socfpga_spim_enable(void)
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{
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const void *reset = &reset_manager_base->per_mod_reset;
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clrbits_le32(reset, 1 << RSTMGR_PERMODRST_SPIM0_LSB);
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clrbits_le32(reset, 1 << RSTMGR_PERMODRST_SPIM1_LSB);
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}
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