546 lines
15 KiB
C
546 lines
15 KiB
C
/*
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* Support for SDHCI on STMicroelectronics SoCs
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*
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* Copyright (C) 2014 STMicroelectronics Ltd
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* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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* Contributors: Peter Griffin <peter.griffin@linaro.org>
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*
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* Based on sdhci-cns3xxx.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/mmc/host.h>
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#include <linux/reset.h>
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#include "sdhci-pltfm.h"
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struct st_mmc_platform_data {
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struct reset_control *rstc;
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struct clk *icnclk;
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void __iomem *top_ioaddr;
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};
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/* MMCSS glue logic to setup the HC on some ST SoCs (e.g. STiH407 family) */
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#define ST_MMC_CCONFIG_REG_1 0x400
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#define ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT BIT(24)
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#define ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ BIT(12)
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#define ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT BIT(8)
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#define ST_MMC_CCONFIG_ASYNC_WAKEUP BIT(0)
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#define ST_MMC_CCONFIG_1_DEFAULT \
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((ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT) | \
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(ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ) | \
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(ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT))
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#define ST_MMC_CCONFIG_REG_2 0x404
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#define ST_MMC_CCONFIG_HIGH_SPEED BIT(28)
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#define ST_MMC_CCONFIG_ADMA2 BIT(24)
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#define ST_MMC_CCONFIG_8BIT BIT(20)
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#define ST_MMC_CCONFIG_MAX_BLK_LEN 16
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#define MAX_BLK_LEN_1024 1
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#define MAX_BLK_LEN_2048 2
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#define BASE_CLK_FREQ_200 0xc8
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#define BASE_CLK_FREQ_100 0x64
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#define BASE_CLK_FREQ_50 0x32
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#define ST_MMC_CCONFIG_2_DEFAULT \
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(ST_MMC_CCONFIG_HIGH_SPEED | ST_MMC_CCONFIG_ADMA2 | \
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ST_MMC_CCONFIG_8BIT | \
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(MAX_BLK_LEN_1024 << ST_MMC_CCONFIG_MAX_BLK_LEN))
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#define ST_MMC_CCONFIG_REG_3 0x408
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#define ST_MMC_CCONFIG_EMMC_SLOT_TYPE BIT(28)
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#define ST_MMC_CCONFIG_64BIT BIT(24)
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#define ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT BIT(20)
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#define ST_MMC_CCONFIG_1P8_VOLT BIT(16)
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#define ST_MMC_CCONFIG_3P0_VOLT BIT(12)
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#define ST_MMC_CCONFIG_3P3_VOLT BIT(8)
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#define ST_MMC_CCONFIG_SUSP_RES_SUPPORT BIT(4)
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#define ST_MMC_CCONFIG_SDMA BIT(0)
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#define ST_MMC_CCONFIG_3_DEFAULT \
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(ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT | \
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ST_MMC_CCONFIG_3P3_VOLT | \
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ST_MMC_CCONFIG_SUSP_RES_SUPPORT | \
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ST_MMC_CCONFIG_SDMA)
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#define ST_MMC_CCONFIG_REG_4 0x40c
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#define ST_MMC_CCONFIG_D_DRIVER BIT(20)
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#define ST_MMC_CCONFIG_C_DRIVER BIT(16)
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#define ST_MMC_CCONFIG_A_DRIVER BIT(12)
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#define ST_MMC_CCONFIG_DDR50 BIT(8)
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#define ST_MMC_CCONFIG_SDR104 BIT(4)
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#define ST_MMC_CCONFIG_SDR50 BIT(0)
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#define ST_MMC_CCONFIG_4_DEFAULT 0
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#define ST_MMC_CCONFIG_REG_5 0x410
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#define ST_MMC_CCONFIG_TUNING_FOR_SDR50 BIT(8)
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#define RETUNING_TIMER_CNT_MAX 0xf
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#define ST_MMC_CCONFIG_5_DEFAULT 0
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/* I/O configuration for Arasan IP */
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#define ST_MMC_GP_OUTPUT 0x450
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#define ST_MMC_GP_OUTPUT_CD BIT(12)
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#define ST_MMC_STATUS_R 0x460
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#define ST_TOP_MMC_DLY_FIX_OFF(x) (x - 0x8)
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/* TOP config registers to manage static and dynamic delay */
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#define ST_TOP_MMC_TX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0x8)
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#define ST_TOP_MMC_RX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0xc)
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/* MMC delay control register */
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#define ST_TOP_MMC_DLY_CTRL ST_TOP_MMC_DLY_FIX_OFF(0x18)
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#define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_CMD BIT(0)
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#define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_PH_SEL BIT(1)
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#define ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE BIT(8)
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#define ST_TOP_MMC_DLY_CTRL_RX_DLL_ENABLE BIT(9)
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#define ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY BIT(10)
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#define ST_TOP_MMC_START_DLL_LOCK BIT(11)
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/* register to provide the phase-shift value for DLL */
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#define ST_TOP_MMC_TX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x1c)
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#define ST_TOP_MMC_RX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x20)
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#define ST_TOP_MMC_RX_CMD_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x24)
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/* phase shift delay on the tx clk 2.188ns */
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#define ST_TOP_MMC_TX_DLL_STEP_DLY_VALID 0x6
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#define ST_TOP_MMC_DLY_MAX 0xf
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#define ST_TOP_MMC_DYN_DLY_CONF \
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(ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE | \
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ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY | \
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ST_TOP_MMC_START_DLL_LOCK)
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/*
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* For clock speeds greater than 90MHz, we need to check that the
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* DLL procedure has finished before switching to ultra-speed modes.
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*/
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#define CLK_TO_CHECK_DLL_LOCK 90000000
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static inline void st_mmcss_set_static_delay(void __iomem *ioaddr)
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{
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if (!ioaddr)
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return;
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writel_relaxed(0x0, ioaddr + ST_TOP_MMC_DLY_CTRL);
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writel_relaxed(ST_TOP_MMC_DLY_MAX,
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ioaddr + ST_TOP_MMC_TX_CLK_DLY);
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}
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/**
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* st_mmcss_cconfig: configure the Arasan HC inside the flashSS.
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* @np: dt device node.
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* @host: sdhci host
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* Description: this function is to configure the Arasan host controller.
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* On some ST SoCs, i.e. STiH407 family, the MMC devices inside a dedicated
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* flashSS sub-system which needs to be configured to be compliant to eMMC 4.5
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* or eMMC4.3. This has to be done before registering the sdhci host.
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*/
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static void st_mmcss_cconfig(struct device_node *np, struct sdhci_host *host)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct mmc_host *mhost = host->mmc;
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u32 cconf2, cconf3, cconf4, cconf5;
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if (!of_device_is_compatible(np, "st,sdhci-stih407"))
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return;
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cconf2 = ST_MMC_CCONFIG_2_DEFAULT;
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cconf3 = ST_MMC_CCONFIG_3_DEFAULT;
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cconf4 = ST_MMC_CCONFIG_4_DEFAULT;
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cconf5 = ST_MMC_CCONFIG_5_DEFAULT;
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writel_relaxed(ST_MMC_CCONFIG_1_DEFAULT,
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host->ioaddr + ST_MMC_CCONFIG_REG_1);
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/* Set clock frequency, default to 50MHz if max-frequency is not
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* provided */
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switch (mhost->f_max) {
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case 200000000:
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clk_set_rate(pltfm_host->clk, mhost->f_max);
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cconf2 |= BASE_CLK_FREQ_200;
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break;
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case 100000000:
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clk_set_rate(pltfm_host->clk, mhost->f_max);
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cconf2 |= BASE_CLK_FREQ_100;
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break;
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default:
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clk_set_rate(pltfm_host->clk, 50000000);
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cconf2 |= BASE_CLK_FREQ_50;
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}
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writel_relaxed(cconf2, host->ioaddr + ST_MMC_CCONFIG_REG_2);
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if (!mmc_card_is_removable(mhost))
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cconf3 |= ST_MMC_CCONFIG_EMMC_SLOT_TYPE;
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else
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/* CARD _D ET_CTRL */
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writel_relaxed(ST_MMC_GP_OUTPUT_CD,
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host->ioaddr + ST_MMC_GP_OUTPUT);
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if (mhost->caps & MMC_CAP_UHS_SDR50) {
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/* use 1.8V */
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cconf3 |= ST_MMC_CCONFIG_1P8_VOLT;
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cconf4 |= ST_MMC_CCONFIG_SDR50;
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/* Use tuning */
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cconf5 |= ST_MMC_CCONFIG_TUNING_FOR_SDR50;
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/* Max timeout for retuning */
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cconf5 |= RETUNING_TIMER_CNT_MAX;
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}
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if (mhost->caps & MMC_CAP_UHS_SDR104) {
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/*
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* SDR104 implies the HC can support HS200 mode, so
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* it's mandatory to use 1.8V
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*/
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cconf3 |= ST_MMC_CCONFIG_1P8_VOLT;
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cconf4 |= ST_MMC_CCONFIG_SDR104;
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/* Max timeout for retuning */
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cconf5 |= RETUNING_TIMER_CNT_MAX;
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}
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if (mhost->caps & MMC_CAP_UHS_DDR50)
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cconf4 |= ST_MMC_CCONFIG_DDR50;
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writel_relaxed(cconf3, host->ioaddr + ST_MMC_CCONFIG_REG_3);
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writel_relaxed(cconf4, host->ioaddr + ST_MMC_CCONFIG_REG_4);
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writel_relaxed(cconf5, host->ioaddr + ST_MMC_CCONFIG_REG_5);
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}
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static inline void st_mmcss_set_dll(void __iomem *ioaddr)
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{
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if (!ioaddr)
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return;
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writel_relaxed(ST_TOP_MMC_DYN_DLY_CONF, ioaddr + ST_TOP_MMC_DLY_CTRL);
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writel_relaxed(ST_TOP_MMC_TX_DLL_STEP_DLY_VALID,
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ioaddr + ST_TOP_MMC_TX_DLL_STEP_DLY);
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}
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static int st_mmcss_lock_dll(void __iomem *ioaddr)
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{
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unsigned long curr, value;
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unsigned long finish = jiffies + HZ;
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/* Checks if the DLL procedure is finished */
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do {
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curr = jiffies;
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value = readl(ioaddr + ST_MMC_STATUS_R);
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if (value & 0x1)
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return 0;
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cpu_relax();
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} while (!time_after_eq(curr, finish));
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return -EBUSY;
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}
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static int sdhci_st_set_dll_for_clock(struct sdhci_host *host)
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{
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int ret = 0;
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
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if (host->clock > CLK_TO_CHECK_DLL_LOCK) {
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st_mmcss_set_dll(pdata->top_ioaddr);
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ret = st_mmcss_lock_dll(host->ioaddr);
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}
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return ret;
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}
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static void sdhci_st_set_uhs_signaling(struct sdhci_host *host,
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unsigned int uhs)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
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u16 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
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int ret = 0;
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/* Select Bus Speed Mode for host */
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ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
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switch (uhs) {
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/*
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* Set V18_EN -- UHS modes do not work without this.
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* does not change signaling voltage
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*/
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case MMC_TIMING_UHS_SDR12:
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st_mmcss_set_static_delay(pdata->top_ioaddr);
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ctrl_2 |= SDHCI_CTRL_UHS_SDR12 | SDHCI_CTRL_VDD_180;
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break;
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case MMC_TIMING_UHS_SDR25:
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st_mmcss_set_static_delay(pdata->top_ioaddr);
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ctrl_2 |= SDHCI_CTRL_UHS_SDR25 | SDHCI_CTRL_VDD_180;
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break;
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case MMC_TIMING_UHS_SDR50:
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st_mmcss_set_static_delay(pdata->top_ioaddr);
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ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
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ret = sdhci_st_set_dll_for_clock(host);
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break;
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case MMC_TIMING_UHS_SDR104:
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case MMC_TIMING_MMC_HS200:
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st_mmcss_set_static_delay(pdata->top_ioaddr);
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ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
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ret = sdhci_st_set_dll_for_clock(host);
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break;
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case MMC_TIMING_UHS_DDR50:
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case MMC_TIMING_MMC_DDR52:
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st_mmcss_set_static_delay(pdata->top_ioaddr);
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ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
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break;
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}
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if (ret)
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dev_warn(mmc_dev(host->mmc), "Error setting dll for clock "
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"(uhs %d)\n", uhs);
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dev_dbg(mmc_dev(host->mmc), "uhs %d, ctrl_2 %04X\n", uhs, ctrl_2);
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sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
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}
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static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
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{
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u32 ret;
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switch (reg) {
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case SDHCI_CAPABILITIES:
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ret = readl_relaxed(host->ioaddr + reg);
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/* Support 3.3V and 1.8V */
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ret &= ~SDHCI_CAN_VDD_300;
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break;
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default:
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ret = readl_relaxed(host->ioaddr + reg);
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}
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return ret;
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}
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static const struct sdhci_ops sdhci_st_ops = {
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.get_max_clock = sdhci_pltfm_clk_get_max_clock,
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.set_clock = sdhci_set_clock,
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.set_bus_width = sdhci_set_bus_width,
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.read_l = sdhci_st_readl,
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.reset = sdhci_reset,
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.set_uhs_signaling = sdhci_st_set_uhs_signaling,
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};
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static const struct sdhci_pltfm_data sdhci_st_pdata = {
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.ops = &sdhci_st_ops,
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.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
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SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN |
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SDHCI_QUIRK_NO_HISPD_BIT,
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.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
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SDHCI_QUIRK2_STOP_WITH_TC,
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};
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static int sdhci_st_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct sdhci_host *host;
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struct st_mmc_platform_data *pdata;
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struct sdhci_pltfm_host *pltfm_host;
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struct clk *clk, *icnclk;
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int ret = 0;
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u16 host_version;
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struct resource *res;
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struct reset_control *rstc;
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clk = devm_clk_get(&pdev->dev, "mmc");
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "Peripheral clk not found\n");
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return PTR_ERR(clk);
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}
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/* ICN clock isn't compulsory, but use it if it's provided. */
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icnclk = devm_clk_get(&pdev->dev, "icn");
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if (IS_ERR(icnclk))
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icnclk = NULL;
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rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
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if (IS_ERR(rstc))
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rstc = NULL;
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else
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reset_control_deassert(rstc);
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host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, sizeof(*pdata));
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if (IS_ERR(host)) {
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dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
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ret = PTR_ERR(host);
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goto err_pltfm_init;
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}
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pltfm_host = sdhci_priv(host);
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pdata = sdhci_pltfm_priv(pltfm_host);
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pdata->rstc = rstc;
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ret = mmc_of_parse(host->mmc);
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if (ret) {
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dev_err(&pdev->dev, "Failed mmc_of_parse\n");
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goto err_of;
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}
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ret = clk_prepare_enable(clk);
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if (ret) {
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dev_err(&pdev->dev, "Failed to prepare clock\n");
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goto err_of;
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}
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ret = clk_prepare_enable(icnclk);
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if (ret) {
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dev_err(&pdev->dev, "Failed to prepare icn clock\n");
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goto err_icnclk;
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}
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/* Configure the FlashSS Top registers for setting eMMC TX/RX delay */
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"top-mmc-delay");
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pdata->top_ioaddr = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(pdata->top_ioaddr)) {
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dev_warn(&pdev->dev, "FlashSS Top Dly registers not available");
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pdata->top_ioaddr = NULL;
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}
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pltfm_host->clk = clk;
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pdata->icnclk = icnclk;
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/* Configure the Arasan HC inside the flashSS */
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st_mmcss_cconfig(np, host);
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ret = sdhci_add_host(host);
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if (ret) {
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dev_err(&pdev->dev, "Failed sdhci_add_host\n");
|
|
goto err_out;
|
|
}
|
|
|
|
host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
|
|
|
|
dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n",
|
|
((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT),
|
|
((host_version & SDHCI_VENDOR_VER_MASK) >>
|
|
SDHCI_VENDOR_VER_SHIFT));
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
clk_disable_unprepare(icnclk);
|
|
err_icnclk:
|
|
clk_disable_unprepare(clk);
|
|
err_of:
|
|
sdhci_pltfm_free(pdev);
|
|
err_pltfm_init:
|
|
if (rstc)
|
|
reset_control_assert(rstc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int sdhci_st_remove(struct platform_device *pdev)
|
|
{
|
|
struct sdhci_host *host = platform_get_drvdata(pdev);
|
|
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
|
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
|
|
struct reset_control *rstc = pdata->rstc;
|
|
int ret;
|
|
|
|
ret = sdhci_pltfm_unregister(pdev);
|
|
|
|
clk_disable_unprepare(pdata->icnclk);
|
|
|
|
if (rstc)
|
|
reset_control_assert(rstc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int sdhci_st_suspend(struct device *dev)
|
|
{
|
|
struct sdhci_host *host = dev_get_drvdata(dev);
|
|
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
|
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
|
|
int ret;
|
|
|
|
if (host->tuning_mode != SDHCI_TUNING_MODE_3)
|
|
mmc_retune_needed(host->mmc);
|
|
|
|
ret = sdhci_suspend_host(host);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (pdata->rstc)
|
|
reset_control_assert(pdata->rstc);
|
|
|
|
clk_disable_unprepare(pdata->icnclk);
|
|
clk_disable_unprepare(pltfm_host->clk);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int sdhci_st_resume(struct device *dev)
|
|
{
|
|
struct sdhci_host *host = dev_get_drvdata(dev);
|
|
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
|
|
struct st_mmc_platform_data *pdata = sdhci_pltfm_priv(pltfm_host);
|
|
struct device_node *np = dev->of_node;
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(pltfm_host->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = clk_prepare_enable(pdata->icnclk);
|
|
if (ret) {
|
|
clk_disable_unprepare(pltfm_host->clk);
|
|
return ret;
|
|
}
|
|
|
|
if (pdata->rstc)
|
|
reset_control_deassert(pdata->rstc);
|
|
|
|
st_mmcss_cconfig(np, host);
|
|
|
|
return sdhci_resume_host(host);
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
|
|
|
|
static const struct of_device_id st_sdhci_match[] = {
|
|
{ .compatible = "st,sdhci" },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, st_sdhci_match);
|
|
|
|
static struct platform_driver sdhci_st_driver = {
|
|
.probe = sdhci_st_probe,
|
|
.remove = sdhci_st_remove,
|
|
.driver = {
|
|
.name = "sdhci-st",
|
|
.pm = &sdhci_st_pmops,
|
|
.of_match_table = of_match_ptr(st_sdhci_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(sdhci_st_driver);
|
|
|
|
MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
|
|
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:sdhci-st");
|