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Synopsys has DWC MSHC controller on HPAS-DX platform connected using PCIe interface with SD card slot and eMMC device slots. This patch is to enable SD cards connected on this platform. As Clock generation logic is implemented using MMCM module of HAPS-DX platform, we have separate functions to control the MMCM to generate required clocks with respect to speed mode. Signed-off-by: Prabu Thangamuthu <prabu.t@synopsys.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SDHCI driver for Synopsys DWC_MSHC controller
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*
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* Copyright (C) 2018 Synopsys, Inc. (www.synopsys.com)
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*
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* Authors:
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* Prabu Thangamuthu <prabu.t@synopsys.com>
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* Manjunath M B <manjumb@synopsys.com>
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*/
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#include "sdhci.h"
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#include "sdhci-pci.h"
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#define SDHCI_VENDOR_PTR_R 0xE8
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/* Synopsys vendor specific registers */
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#define SDHC_GPIO_OUT 0x34
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#define SDHC_AT_CTRL_R 0x40
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#define SDHC_SW_TUNE_EN 0x00000010
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/* MMCM DRP */
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#define SDHC_MMCM_DIV_REG 0x1020
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#define DIV_REG_100_MHZ 0x1145
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#define DIV_REG_200_MHZ 0x1083
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#define SDHC_MMCM_CLKFBOUT 0x1024
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#define CLKFBOUT_100_MHZ 0x0000
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#define CLKFBOUT_200_MHZ 0x0080
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#define SDHC_CCLK_MMCM_RST 0x00000001
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static void sdhci_snps_set_clock(struct sdhci_host *host, unsigned int clock)
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{
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u16 clk;
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u32 reg, vendor_ptr;
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vendor_ptr = sdhci_readw(host, SDHCI_VENDOR_PTR_R);
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/* Disable software managed rx tuning */
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reg = sdhci_readl(host, (SDHC_AT_CTRL_R + vendor_ptr));
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reg &= ~SDHC_SW_TUNE_EN;
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sdhci_writel(host, reg, (SDHC_AT_CTRL_R + vendor_ptr));
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if (clock <= 52000000) {
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sdhci_set_clock(host, clock);
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} else {
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/* Assert reset to MMCM */
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reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
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reg |= SDHC_CCLK_MMCM_RST;
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sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
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/* Configure MMCM */
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if (clock == 100000000) {
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sdhci_writel(host, DIV_REG_100_MHZ, SDHC_MMCM_DIV_REG);
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sdhci_writel(host, CLKFBOUT_100_MHZ,
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SDHC_MMCM_CLKFBOUT);
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} else {
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sdhci_writel(host, DIV_REG_200_MHZ, SDHC_MMCM_DIV_REG);
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sdhci_writel(host, CLKFBOUT_200_MHZ,
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SDHC_MMCM_CLKFBOUT);
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}
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/* De-assert reset to MMCM */
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reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
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reg &= ~SDHC_CCLK_MMCM_RST;
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sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
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/* Enable clock */
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clk = SDHCI_PROG_CLOCK_MODE | SDHCI_CLOCK_INT_EN |
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SDHCI_CLOCK_CARD_EN;
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sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
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}
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}
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static const struct sdhci_ops sdhci_snps_ops = {
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.set_clock = sdhci_snps_set_clock,
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.enable_dma = sdhci_pci_enable_dma,
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.set_bus_width = sdhci_set_bus_width,
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.reset = sdhci_reset,
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.set_uhs_signaling = sdhci_set_uhs_signaling,
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};
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const struct sdhci_pci_fixes sdhci_snps = {
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.ops = &sdhci_snps_ops,
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};
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