283 lines
7.3 KiB
C
283 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) STMicroelectronics 2018 - All Rights Reserved
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* Author: Ludovic.barre@st.com for STMicroelectronics.
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*/
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/reset.h>
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#include <linux/scatterlist.h>
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#include "mmci.h"
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#define SDMMC_LLI_BUF_LEN PAGE_SIZE
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#define SDMMC_IDMA_BURST BIT(MMCI_STM32_IDMABNDT_SHIFT)
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struct sdmmc_lli_desc {
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u32 idmalar;
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u32 idmabase;
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u32 idmasize;
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};
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struct sdmmc_priv {
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dma_addr_t sg_dma;
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void *sg_cpu;
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};
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int sdmmc_idma_validate_data(struct mmci_host *host,
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struct mmc_data *data)
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{
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struct scatterlist *sg;
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int i;
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/*
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* idma has constraints on idmabase & idmasize for each element
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* excepted the last element which has no constraint on idmasize
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*/
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for_each_sg(data->sg, sg, data->sg_len - 1, i) {
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if (!IS_ALIGNED(sg_dma_address(data->sg), sizeof(u32)) ||
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!IS_ALIGNED(sg_dma_len(data->sg), SDMMC_IDMA_BURST)) {
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dev_err(mmc_dev(host->mmc),
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"unaligned scatterlist: ofst:%x length:%d\n",
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data->sg->offset, data->sg->length);
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return -EINVAL;
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}
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}
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if (!IS_ALIGNED(sg_dma_address(data->sg), sizeof(u32))) {
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dev_err(mmc_dev(host->mmc),
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"unaligned last scatterlist: ofst:%x length:%d\n",
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data->sg->offset, data->sg->length);
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return -EINVAL;
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}
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return 0;
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}
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static int _sdmmc_idma_prep_data(struct mmci_host *host,
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struct mmc_data *data)
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{
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int n_elem;
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n_elem = dma_map_sg(mmc_dev(host->mmc),
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data->sg,
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data->sg_len,
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mmc_get_dma_dir(data));
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if (!n_elem) {
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dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n");
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return -EINVAL;
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}
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return 0;
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}
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static int sdmmc_idma_prep_data(struct mmci_host *host,
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struct mmc_data *data, bool next)
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{
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/* Check if job is already prepared. */
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if (!next && data->host_cookie == host->next_cookie)
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return 0;
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return _sdmmc_idma_prep_data(host, data);
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}
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static void sdmmc_idma_unprep_data(struct mmci_host *host,
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struct mmc_data *data, int err)
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{
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dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
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mmc_get_dma_dir(data));
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}
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static int sdmmc_idma_setup(struct mmci_host *host)
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{
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struct sdmmc_priv *idma;
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idma = devm_kzalloc(mmc_dev(host->mmc), sizeof(*idma), GFP_KERNEL);
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if (!idma)
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return -ENOMEM;
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host->dma_priv = idma;
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if (host->variant->dma_lli) {
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idma->sg_cpu = dmam_alloc_coherent(mmc_dev(host->mmc),
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SDMMC_LLI_BUF_LEN,
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&idma->sg_dma, GFP_KERNEL);
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if (!idma->sg_cpu) {
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dev_err(mmc_dev(host->mmc),
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"Failed to alloc IDMA descriptor\n");
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return -ENOMEM;
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}
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host->mmc->max_segs = SDMMC_LLI_BUF_LEN /
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sizeof(struct sdmmc_lli_desc);
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host->mmc->max_seg_size = host->variant->stm32_idmabsize_mask;
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} else {
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host->mmc->max_segs = 1;
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host->mmc->max_seg_size = host->mmc->max_req_size;
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}
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return 0;
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}
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static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl)
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{
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struct sdmmc_priv *idma = host->dma_priv;
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struct sdmmc_lli_desc *desc = (struct sdmmc_lli_desc *)idma->sg_cpu;
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struct mmc_data *data = host->data;
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struct scatterlist *sg;
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int i;
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if (!host->variant->dma_lli || data->sg_len == 1) {
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writel_relaxed(sg_dma_address(data->sg),
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host->base + MMCI_STM32_IDMABASE0R);
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writel_relaxed(MMCI_STM32_IDMAEN,
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host->base + MMCI_STM32_IDMACTRLR);
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return 0;
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}
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for_each_sg(data->sg, sg, data->sg_len, i) {
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desc[i].idmalar = (i + 1) * sizeof(struct sdmmc_lli_desc);
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desc[i].idmalar |= MMCI_STM32_ULA | MMCI_STM32_ULS
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| MMCI_STM32_ABR;
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desc[i].idmabase = sg_dma_address(sg);
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desc[i].idmasize = sg_dma_len(sg);
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}
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/* notice the end of link list */
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desc[data->sg_len - 1].idmalar &= ~MMCI_STM32_ULA;
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dma_wmb();
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writel_relaxed(idma->sg_dma, host->base + MMCI_STM32_IDMABAR);
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writel_relaxed(desc[0].idmalar, host->base + MMCI_STM32_IDMALAR);
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writel_relaxed(desc[0].idmabase, host->base + MMCI_STM32_IDMABASE0R);
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writel_relaxed(desc[0].idmasize, host->base + MMCI_STM32_IDMABSIZER);
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writel_relaxed(MMCI_STM32_IDMAEN | MMCI_STM32_IDMALLIEN,
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host->base + MMCI_STM32_IDMACTRLR);
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return 0;
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}
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static void sdmmc_idma_finalize(struct mmci_host *host, struct mmc_data *data)
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{
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writel_relaxed(0, host->base + MMCI_STM32_IDMACTRLR);
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}
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static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired)
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{
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unsigned int clk = 0, ddr = 0;
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if (host->mmc->ios.timing == MMC_TIMING_MMC_DDR52 ||
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host->mmc->ios.timing == MMC_TIMING_UHS_DDR50)
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ddr = MCI_STM32_CLK_DDR;
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/*
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* cclk = mclk / (2 * clkdiv)
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* clkdiv 0 => bypass
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* in ddr mode bypass is not possible
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*/
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if (desired) {
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if (desired >= host->mclk && !ddr) {
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host->cclk = host->mclk;
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} else {
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clk = DIV_ROUND_UP(host->mclk, 2 * desired);
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if (clk > MCI_STM32_CLK_CLKDIV_MSK)
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clk = MCI_STM32_CLK_CLKDIV_MSK;
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host->cclk = host->mclk / (2 * clk);
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}
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} else {
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/*
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* while power-on phase the clock can't be define to 0,
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* Only power-off and power-cyc deactivate the clock.
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* if desired clock is 0, set max divider
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*/
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clk = MCI_STM32_CLK_CLKDIV_MSK;
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host->cclk = host->mclk / (2 * clk);
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}
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/* Set actual clock for debug */
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if (host->mmc->ios.power_mode == MMC_POWER_ON)
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host->mmc->actual_clock = host->cclk;
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else
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host->mmc->actual_clock = 0;
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if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
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clk |= MCI_STM32_CLK_WIDEBUS_4;
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if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
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clk |= MCI_STM32_CLK_WIDEBUS_8;
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clk |= MCI_STM32_CLK_HWFCEN;
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clk |= host->clk_reg_add;
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clk |= ddr;
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/*
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* SDMMC_FBCK is selected when an external Delay Block is needed
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* with SDR104.
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*/
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if (host->mmc->ios.timing >= MMC_TIMING_UHS_SDR50) {
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clk |= MCI_STM32_CLK_BUSSPEED;
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if (host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) {
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clk &= ~MCI_STM32_CLK_SEL_MSK;
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clk |= MCI_STM32_CLK_SELFBCK;
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}
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}
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mmci_write_clkreg(host, clk);
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}
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static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr)
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{
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struct mmc_ios ios = host->mmc->ios;
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pwr = host->pwr_reg_add;
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if (ios.power_mode == MMC_POWER_OFF) {
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/* Only a reset could power-off sdmmc */
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reset_control_assert(host->rst);
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udelay(2);
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reset_control_deassert(host->rst);
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/*
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* Set the SDMMC in Power-cycle state.
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* This will make that the SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK
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* are driven low, to prevent the Card from being supplied
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* through the signal lines.
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*/
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mmci_write_pwrreg(host, MCI_STM32_PWR_CYC | pwr);
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} else if (ios.power_mode == MMC_POWER_ON) {
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/*
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* After power-off (reset): the irq mask defined in probe
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* functionis lost
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* ault irq mask (probe) must be activated
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*/
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writel(MCI_IRQENABLE | host->variant->start_err,
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host->base + MMCIMASK0);
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/*
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* After a power-cycle state, we must set the SDMMC in
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* Power-off. The SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK are
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* driven high. Then we can set the SDMMC to Power-on state
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*/
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mmci_write_pwrreg(host, MCI_PWR_OFF | pwr);
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mdelay(1);
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mmci_write_pwrreg(host, MCI_PWR_ON | pwr);
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}
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}
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static struct mmci_host_ops sdmmc_variant_ops = {
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.validate_data = sdmmc_idma_validate_data,
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.prep_data = sdmmc_idma_prep_data,
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.unprep_data = sdmmc_idma_unprep_data,
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.dma_setup = sdmmc_idma_setup,
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.dma_start = sdmmc_idma_start,
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.dma_finalize = sdmmc_idma_finalize,
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.set_clkreg = mmci_sdmmc_set_clkreg,
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.set_pwrreg = mmci_sdmmc_set_pwrreg,
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};
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void sdmmc_variant_init(struct mmci_host *host)
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{
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host->ops = &sdmmc_variant_ops;
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}
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