1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for Marvell Xenon SDHC as a platform device
8  * Date:	2016-8-24
21 #include "sdhci-pltfm.h"
22 #include "sdhci-xenon.h"
41 			dev_err(mmc_dev(host->mmc), "Internal clock never stabilised.\n");  in xenon_enable_internal_clk()
42 			return -ETIMEDOUT;  in xenon_enable_internal_clk()
50 /* Set SDCLK-off-while-idle */
91 	host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;  in xenon_enable_sdhc()
96 	host->mmc->caps &= ~MMC_CAP_BUS_WIDTH_TEST;  in xenon_enable_sdhc()
137 	/* Disable the Re-Tuning Request functionality */  in xenon_retune_setup()
142 	/* Disable the Re-tuning Interrupt */  in xenon_retune_setup()
151 	host->tuning_mode = SDHCI_TUNING_MODE_1;  in xenon_retune_setup()
152 	/* Set re-tuning period */  in xenon_retune_setup()
153 	host->tuning_count = 1 << (priv->tuning_count - 1);  in xenon_retune_setup()
167 	/* Disable tuning request and auto-retuning again */  in xenon_reset_exit()
188 	xenon_reset_exit(host, priv->sdhc_id, mask);  in xenon_reset()
192  * Xenon defines different values for HS200 and HS400
224 	struct mmc_host *mmc = host->mmc;  in xenon_set_power()
225 	u8 pwr = host->pwr;  in xenon_set_power()
229 	if (host->pwr == pwr)  in xenon_set_power()
232 	if (host->pwr == 0)  in xenon_set_power()
235 	if (!IS_ERR(mmc->supply.vmmc))  in xenon_set_power()
236 		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);  in xenon_set_power()
263  * Xenon Specific Operations in mmc_host_ops
279 	if ((ios->timing == MMC_TIMING_MMC_HS400) ||  in xenon_set_ios()
280 	    (ios->timing == MMC_TIMING_MMC_HS200) ||  in xenon_set_ios()
281 	    (ios->timing == MMC_TIMING_MMC_HS)) {  in xenon_set_ios()
282 		host->preset_enabled = false;  in xenon_set_ios()
283 		host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;  in xenon_set_ios()
284 		host->flags &= ~SDHCI_PV_ENABLED;  in xenon_set_ios()
290 		host->quirks2 &= ~SDHCI_QUIRK2_PRESET_VALUE_BROKEN;  in xenon_set_ios()
296 	if (host->clock > XENON_DEFAULT_SDCLK_FREQ)  in xenon_set_ios()
297 		xenon_set_sdclk_off_idle(host, priv->sdhc_id, true);  in xenon_set_ios()
317 	xenon_soc_pad_ctrl(host, ios->signal_voltage);  in xenon_start_signal_voltage_switch()
324 	if (PTR_ERR(mmc->supply.vqmmc) == -ENODEV)  in xenon_start_signal_voltage_switch()
332  * priv->init_card_type will be used in PHY timing adjustment.
341 	priv->init_card_type = card->type;  in xenon_init_card()
348 	if (host->timing == MMC_TIMING_UHS_DDR50 ||  in xenon_execute_tuning()
349 		host->timing == MMC_TIMING_MMC_DDR52)  in xenon_execute_tuning()
353 	 * Currently force Xenon driver back to support mode 1 only,  in xenon_execute_tuning()
354 	 * even though Xenon might claim to support mode 2 or mode 3.  in xenon_execute_tuning()
357 	if (host->tuning_mode != SDHCI_TUNING_MODE_1)  in xenon_execute_tuning()
369 	u8 sdhc_id = priv->sdhc_id;  in xenon_enable_sdio_irq()
391 	host->mmc_host_ops.set_ios = xenon_set_ios;  in xenon_replace_mmc_host_ops()
392 	host->mmc_host_ops.start_signal_voltage_switch =  in xenon_replace_mmc_host_ops()
394 	host->mmc_host_ops.init_card = xenon_init_card;  in xenon_replace_mmc_host_ops()
395 	host->mmc_host_ops.execute_tuning = xenon_execute_tuning;  in xenon_replace_mmc_host_ops()
396 	host->mmc_host_ops.enable_sdio_irq = xenon_enable_sdio_irq;  in xenon_replace_mmc_host_ops()
400  * Parse Xenon specific DT properties:
401  * sdhc-id: the index of current SDHC.
403  * tun-count: the interval between re-tuning
407 	struct device_node *np = pdev->dev.of_node;  in xenon_probe_dt()
409 	struct mmc_host *mmc = host->mmc;  in xenon_probe_dt()
416 	if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci"))  in xenon_probe_dt()
417 		host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;  in xenon_probe_dt()
420 	if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) {  in xenon_probe_dt()
426 			return -EINVAL;  in xenon_probe_dt()
429 	priv->sdhc_id = sdhc_id;  in xenon_probe_dt()
432 	if (!of_property_read_u32(np, "marvell,xenon-tun-count",  in xenon_probe_dt()
435 			dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n",  in xenon_probe_dt()
440 	priv->tuning_count = tuning_count;  in xenon_probe_dt()
449 	u8 sdhc_id = priv->sdhc_id;  in xenon_sdhc_prepare()
460 	/* Disable SDCLK-Off-While-Idle before card init */  in xenon_sdhc_prepare()
472 	u8 sdhc_id = priv->sdhc_id;  in xenon_sdhc_unprepare()
494 	 * Link Xenon specific mmc_host_ops function,  in xenon_probe()
499 	pltfm_host->clk = devm_clk_get(&pdev->dev, "core");  in xenon_probe()
500 	if (IS_ERR(pltfm_host->clk)) {  in xenon_probe()
501 		err = PTR_ERR(pltfm_host->clk);  in xenon_probe()
502 		dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);  in xenon_probe()
505 	err = clk_prepare_enable(pltfm_host->clk);  in xenon_probe()
509 	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");  in xenon_probe()
510 	if (IS_ERR(priv->axi_clk)) {  in xenon_probe()
511 		err = PTR_ERR(priv->axi_clk);  in xenon_probe()
512 		if (err == -EPROBE_DEFER)  in xenon_probe()
515 		err = clk_prepare_enable(priv->axi_clk);  in xenon_probe()
520 	err = mmc_of_parse(host->mmc);  in xenon_probe()
528 	/* Xenon specific dt parse */  in xenon_probe()
537 	pm_runtime_get_noresume(&pdev->dev);  in xenon_probe()
538 	pm_runtime_set_active(&pdev->dev);  in xenon_probe()
539 	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);  in xenon_probe()
540 	pm_runtime_use_autosuspend(&pdev->dev);  in xenon_probe()
541 	pm_runtime_enable(&pdev->dev);  in xenon_probe()
542 	pm_suspend_ignore_children(&pdev->dev, 1);  in xenon_probe()
548 	pm_runtime_put_autosuspend(&pdev->dev);  in xenon_probe()
553 	pm_runtime_disable(&pdev->dev);  in xenon_probe()
554 	pm_runtime_put_noidle(&pdev->dev);  in xenon_probe()
557 	clk_disable_unprepare(priv->axi_clk);  in xenon_probe()
559 	clk_disable_unprepare(pltfm_host->clk);  in xenon_probe()
571 	pm_runtime_get_sync(&pdev->dev);  in xenon_remove()
572 	pm_runtime_disable(&pdev->dev);  in xenon_remove()
573 	pm_runtime_put_noidle(&pdev->dev);  in xenon_remove()
578 	clk_disable_unprepare(priv->axi_clk);  in xenon_remove()
579 	clk_disable_unprepare(pltfm_host->clk);  in xenon_remove()
596 	priv->restore_needed = true;  in xenon_suspend()
613 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)  in xenon_runtime_suspend()
614 		mmc_retune_needed(host->mmc);  in xenon_runtime_suspend()
616 	clk_disable_unprepare(pltfm_host->clk);  in xenon_runtime_suspend()
618 	 * Need to update the priv->clock here, or when runtime resume  in xenon_runtime_suspend()
622 	priv->clock = 0;  in xenon_runtime_suspend()
633 	ret = clk_prepare_enable(pltfm_host->clk);  in xenon_runtime_resume()
639 	if (priv->restore_needed) {  in xenon_runtime_resume()
643 		priv->restore_needed = false;  in xenon_runtime_resume()
651 	clk_disable_unprepare(pltfm_host->clk);  in xenon_runtime_resume()
665 	{ .compatible = "marvell,armada-ap806-sdhci",},
666 	{ .compatible = "marvell,armada-cp110-sdhci",},
667 	{ .compatible = "marvell,armada-3700-sdhci",},
674 		.name	= "xenon-sdhci",
685 MODULE_DESCRIPTION("SDHCI platform driver for Marvell Xenon SDHC");