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From:   Victor Shih <victorshihgli@gmail.com>
To:     ulf.hansson@linaro.org, adrian.hunter@intel.com
Cc:     linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
        benchuanggli@gmail.com, HL.Liu@genesyslogic.com.tw,
        Greg.tu@genesyslogic.com.tw, takahiro.akashi@linaro.org,
        dlunev@chromium.org, Victor Shih <victorshihgli@gmail.com>,
        Ben Chuang <ben.chuang@genesyslogic.com.tw>,
        Victor Shih <victor.shih@genesyslogic.com.tw>
Subject: [PATCH V13 18/21] mmc: sdhci-uhs2: add add_host() and others to set up the driver
Date:   Fri, 17 Nov 2023 19:31:46 +0800
Message-Id: <20231117113149.9069-19-victorshihgli@gmail.com>
In-Reply-To: <20231117113149.9069-1-victorshihgli@gmail.com>
References: <20231117113149.9069-1-victorshihgli@gmail.com>
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From: Victor Shih <victor.shih@genesyslogic.com.tw>

This is a UHS-II version of sdhci's add_host/remove_host operation.
Any sdhci drivers which are capable of handling UHS-II cards must
call those functions instead of the corresponding sdhci's.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
---

Updates in V13:
 - Re-order function to avoid declaration.
 - Use vqmmc2 to stead vmmc2.

Updates in V11:
 - Remove unused ocr_avail_uhs2.

Updates in V10:
 - Move some definitions of PatchV9[05/23] to PatchV10[20/23].

Updates in V8:
 - Change return type to void for __sdhci_uhs2_add_host_v4().
 - Remove unused variables in __sdhci_uhs2_add_host_v4().

Updates in V7:
 - __sdhci_add_host() to instead of __sdhci_uhs2_add_host()
   in sdhci_uhs2_add_host().
 - Cancel export state of some functions.

Updates in V6:
 - Add complete_work_fn/thread_irq_fn variables in struct sdhci_host.
 - Use complete_work_fn/thread_irq_fn variables in
   sdhci_alloc_host() and sdhci_uhs2_add_host().
 - Use sdhci_uhs2_mode() to simplify code in __sdhci_uhs2_remove_host().

---

 drivers/mmc/host/sdhci-uhs2.c | 98 +++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |  2 +
 drivers/mmc/host/sdhci.c      |  7 ++-
 drivers/mmc/host/sdhci.h      |  3 ++
 4 files changed, 108 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 3b7dca3fc9af..45ff0bfedf3c 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -16,6 +16,7 @@
 #include <linux/bitfield.h>
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/host.h>
+#include <linux/regulator/consumer.h>
 
 #include "sdhci.h"
 #include "sdhci-uhs2.h"
@@ -1151,6 +1152,103 @@ static void __exit sdhci_uhs2_mod_exit(void)
 }
 module_exit(sdhci_uhs2_mod_exit);
 
+/*****************************************************************************\
+ *
+ * Device allocation/registration                                            *
+ *                                                                           *
+\*****************************************************************************/
+
+static void __sdhci_uhs2_add_host_v4(struct sdhci_host *host, u32 caps1)
+{
+	struct mmc_host *mmc;
+	u32 max_current_caps2;
+
+	mmc = host->mmc;
+
+	/* Support UHS2 */
+	if (caps1 & SDHCI_SUPPORT_UHS2)
+		mmc->caps2 |= MMC_CAP2_SD_UHS2;
+
+	max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1);
+
+	if ((caps1 & SDHCI_CAN_VDD2_180) &&
+	    !max_current_caps2 &&
+	    !IS_ERR(mmc->supply.vqmmc2)) {
+		/* UHS2 - VDD2 */
+		int curr = regulator_get_current_limit(mmc->supply.vqmmc2);
+
+		if (curr > 0) {
+			/* convert to SDHCI_MAX_CURRENT format */
+			curr = curr / 1000;  /* convert to mA */
+			curr = curr / SDHCI_MAX_CURRENT_MULTIPLIER;
+			curr = min_t(u32, curr, SDHCI_MAX_CURRENT_LIMIT);
+			max_current_caps2 = curr;
+		}
+	}
+
+	if (!(caps1 & SDHCI_CAN_VDD2_180))
+		mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
+}
+
+static void __sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
+{
+	if (!sdhci_uhs2_mode(host))
+		return;
+
+	if (!dead)
+		sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL);
+}
+
+int sdhci_uhs2_add_host(struct sdhci_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+	int ret;
+
+	ret = sdhci_setup_host(host);
+	if (ret)
+		return ret;
+
+	if (host->version >= SDHCI_SPEC_400)
+		__sdhci_uhs2_add_host_v4(host, host->caps1);
+
+	if ((mmc->caps2 & MMC_CAP2_SD_UHS2) && !host->v4_mode)
+		/* host doesn't want to enable UHS2 support */
+		mmc->caps2 &= ~MMC_CAP2_SD_UHS2;
+
+	/* overwrite ops */
+	if (mmc->caps2 & MMC_CAP2_SD_UHS2)
+		sdhci_uhs2_host_ops_init(host);
+
+	host->complete_work_fn = sdhci_uhs2_complete_work;
+	host->thread_irq_fn    = sdhci_uhs2_thread_irq;
+
+	/* LED support not implemented for UHS2 */
+	host->quirks |= SDHCI_QUIRK_NO_LED;
+
+	ret = __sdhci_add_host(host);
+	if (ret)
+		goto cleanup;
+
+	return 0;
+
+cleanup:
+	if (host->version >= SDHCI_SPEC_400)
+		__sdhci_uhs2_remove_host(host, 0);
+
+	sdhci_cleanup_host(host);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_add_host);
+
+void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
+{
+	__sdhci_uhs2_remove_host(host, dead);
+
+	sdhci_remove_host(host, dead);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_remove_host);
+
 MODULE_AUTHOR("Intel, Genesys Logic, Linaro");
 MODULE_DESCRIPTION("MMC UHS-II Support");
 MODULE_LICENSE("GPL");
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index dff14c2bc9aa..1d79bfddce4e 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -184,5 +184,7 @@ void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
 void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
 void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 clear, u32 set);
 u32 sdhci_uhs2_irq(struct sdhci_host *host, u32 intmask);
+int sdhci_uhs2_add_host(struct sdhci_host *host);
+void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead);
 
 #endif /* __SDHCI_UHS2_H */
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 842510c9162a..245aaa0ec309 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -4105,6 +4105,9 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
 
 	host->max_timeout_count = 0xE;
 
+	host->complete_work_fn = sdhci_complete_work;
+	host->thread_irq_fn    = sdhci_thread_irq;
+
 	return host;
 }
 
@@ -4854,7 +4857,7 @@ int __sdhci_add_host(struct sdhci_host *host)
 	if (!host->complete_wq)
 		return -ENOMEM;
 
-	INIT_WORK(&host->complete_work, sdhci_complete_work);
+	INIT_WORK(&host->complete_work, host->complete_work_fn);
 
 	timer_setup(&host->timer, sdhci_timeout_timer, 0);
 	timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
@@ -4863,7 +4866,7 @@ int __sdhci_add_host(struct sdhci_host *host)
 
 	sdhci_init(host, 0);
 
-	ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq,
+	ret = request_threaded_irq(host->irq, sdhci_irq, host->thread_irq_fn,
 				   IRQF_SHARED,	mmc_hostname(mmc), host);
 	if (ret) {
 		pr_err("%s: Failed to request IRQ %d: %d\n",
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 1485e4f1ff49..1085942d47a9 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -626,6 +626,9 @@ struct sdhci_host {
 	struct timer_list timer;	/* Timer for timeouts */
 	struct timer_list data_timer;	/* Timer for data timeouts */
 
+	void		(*complete_work_fn)(struct work_struct *work);
+	irqreturn_t	(*thread_irq_fn)(int irq, void *dev_id);
+
 #if IS_ENABLED(CONFIG_MMC_SDHCI_EXTERNAL_DMA)
 	struct dma_chan *rx_chan;
 	struct dma_chan *tx_chan;
-- 
2.25.1