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https://github.com/brain-hackers/u-boot-brain
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4e782b5940
DW SDIO controller has external CIU clock divider controlled via register in the SDIO IP. Due to its unexpected default value (we expected it to divide by 1 but in reality it divides by 8) SDIO IP uses wrong CIU clock (it should be 100000000Hz but actual is 12500000Hz) and works unstable (see STAR 9001204800). So increase SDIO CIU frequency from actual 12500000Hz to 50000000Hz by switching from the default divisor value (div-by-8) to the minimum possible value of the divisor (div-by-2) in HSDK platform code. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Copyright (C) 2017 Synopsys, Inc. All rights reserved.
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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 <dwmmc.h>
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#include <malloc.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000)
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#define CREG_PAE (CREG_BASE + 0x180)
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#define CREG_PAE_UPDATE (CREG_BASE + 0x194)
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#define CREG_CPU_START (CREG_BASE + 0x400)
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int board_early_init_f(void)
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{
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/* In current chip PAE support for DMA is broken, disabling it. */
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writel(0, (void __iomem *) CREG_PAE);
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/* Really apply settings made above */
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writel(1, (void __iomem *) CREG_PAE_UPDATE);
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return 0;
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}
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#define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000)
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#define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108)
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#define SDIO_UHS_REG_EXT_DIV_2 (2 << 30)
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int board_mmc_init(bd_t *bis)
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{
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struct dwmci_host *host = NULL;
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host = malloc(sizeof(struct dwmci_host));
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if (!host) {
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printf("dwmci_host malloc fail!\n");
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return 1;
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}
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/*
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* Switch SDIO external ciu clock divider from default div-by-8 to
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* minimum possible div-by-2.
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*/
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writel(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT);
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memset(host, 0, sizeof(struct dwmci_host));
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host->name = "Synopsys Mobile storage";
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host->ioaddr = (void *)ARC_DWMMC_BASE;
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host->buswidth = 4;
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host->dev_index = 0;
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host->bus_hz = 50000000;
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add_dwmci(host, host->bus_hz / 2, 400000);
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return 0;
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}
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#define RESET_VECTOR_ADDR 0x0
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void smp_set_core_boot_addr(unsigned long addr, int corenr)
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{
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/* All cores have reset vector pointing to 0 */
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writel(addr, (void __iomem *)RESET_VECTOR_ADDR);
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/* Make sure other cores see written value in memory */
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flush_dcache_all();
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}
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void smp_kick_all_cpus(void)
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{
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#define BITS_START_CORE1 1
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#define BITS_START_CORE2 2
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#define BITS_START_CORE3 3
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int cmd = readl((void __iomem *)CREG_CPU_START);
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cmd |= (1 << BITS_START_CORE1) |
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(1 << BITS_START_CORE2) |
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(1 << BITS_START_CORE3);
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writel(cmd, (void __iomem *)CREG_CPU_START);
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}
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