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72ba30aecc
That's how it looks like without CONFIG_MMC_SUPPORTS_TUNING before the patch: aarch64-buildroot-linux-gnu-ld.bfd: drivers/mmc/cv1800b_sdhci.o: in function `cv1800b_execute_tuning': drivers/mmc/cv1800b_sdhci.c:47:(.text.cv1800b_execute_tuning+0x50): undefined reference to `mmc_send_tuning' Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com>
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2024, Kongyang Liu <seashell11234455@gmail.com>
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*/
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#include <dm.h>
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#include <mmc.h>
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#include <sdhci.h>
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#include <linux/delay.h>
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#define SDHCI_PHY_TX_RX_DLY 0x240
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#define MMC_MAX_CLOCK 375000000
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#define TUNE_MAX_PHCODE 128
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#define PHY_TX_SRC_INVERT BIT(8)
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struct cv1800b_sdhci_plat {
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struct mmc_config cfg;
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struct mmc mmc;
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};
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static void cv1800b_set_tap_delay(struct sdhci_host *host, u16 tap)
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{
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sdhci_writel(host, PHY_TX_SRC_INVERT | tap << 16, SDHCI_PHY_TX_RX_DLY);
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}
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static void cv1800b_sdhci_reset(struct sdhci_host *host, u8 mask)
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{
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sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
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while (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)
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udelay(10);
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}
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#if CONFIG_IS_ENABLED(MMC_SUPPORTS_TUNING)
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static int cv1800b_execute_tuning(struct mmc *mmc, u8 opcode)
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{
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struct sdhci_host *host = dev_get_priv(mmc->dev);
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u16 tap;
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int current_size = 0;
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int max_size = 0;
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int max_window = 0;
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for (tap = 0; tap < TUNE_MAX_PHCODE; tap++) {
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cv1800b_set_tap_delay(host, tap);
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if (mmc_send_tuning(host->mmc, opcode)) {
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current_size = 0;
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} else {
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current_size++;
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if (current_size > max_size) {
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max_size = current_size;
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max_window = tap;
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}
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}
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}
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cv1800b_sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
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cv1800b_set_tap_delay(host, max_window - max_size / 2);
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return 0;
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}
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#endif
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const struct sdhci_ops cv1800b_sdhci_sd_ops = {
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#if CONFIG_IS_ENABLED(MMC_SUPPORTS_TUNING)
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.platform_execute_tuning = cv1800b_execute_tuning,
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#endif
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};
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static int cv1800b_sdhci_bind(struct udevice *dev)
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{
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struct cv1800b_sdhci_plat *plat = dev_get_plat(dev);
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return sdhci_bind(dev, &plat->mmc, &plat->cfg);
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}
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static int cv1800b_sdhci_probe(struct udevice *dev)
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{
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struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
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struct cv1800b_sdhci_plat *plat = dev_get_plat(dev);
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struct sdhci_host *host = dev_get_priv(dev);
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int ret;
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host->name = dev->name;
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host->ioaddr = devfdt_get_addr_ptr(dev);
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upriv->mmc = &plat->mmc;
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host->mmc = &plat->mmc;
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host->mmc->priv = host;
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host->mmc->dev = dev;
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host->ops = &cv1800b_sdhci_sd_ops;
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host->max_clk = MMC_MAX_CLOCK;
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ret = mmc_of_parse(dev, &plat->cfg);
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if (ret)
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return ret;
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ret = sdhci_setup_cfg(&plat->cfg, host, 0, 200000);
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if (ret)
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return ret;
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return sdhci_probe(dev);
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}
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static const struct udevice_id cv1800b_sdhci_match[] = {
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{ .compatible = "sophgo,cv1800b-dwcmshc" },
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{ }
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};
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U_BOOT_DRIVER(cv1800b_sdhci) = {
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.name = "sdhci-cv1800b",
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.id = UCLASS_MMC,
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.of_match = cv1800b_sdhci_match,
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.bind = cv1800b_sdhci_bind,
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.probe = cv1800b_sdhci_probe,
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.priv_auto = sizeof(struct sdhci_host),
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.plat_auto = sizeof(struct cv1800b_sdhci_plat),
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.ops = &sdhci_ops,
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};
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