[PATCH V23 08/16] mmc: sdhci-uhs2: add add_host() and others to set up the driver

[Victor Shih <victorshihgli@gmail.com>]

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 V22:
 - Adjust the patch order from v21 patch#18 to v22 patch#14 and
   remove unnecessary code to avoid defined but not used warnings.

Updates in V14:
 - Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
   __sdhci_uhs2_remove_host().

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 | 91 +++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |  2 +
 2 files changed, 93 insertions(+)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 6b249eb8395a..d3af620c7b68 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/iopoll.h>
 #include <linux/bitfield.h>
+#include <linux/regulator/consumer.h>
 
 #include "sdhci.h"
 #include "sdhci-uhs2.h"
@@ -224,6 +225,96 @@ 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 (!mmc_card_uhs2(host->mmc))
+		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;
+
+	/* 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 9bd3f610cf8c..0e1866a6bdb6 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -181,5 +181,7 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host);
 void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
 void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd);
 void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
+int sdhci_uhs2_add_host(struct sdhci_host *host);
+void sdhci_uhs2_remove_host(struct sdhci_host *host, int dead);
 
 #endif /* __SDHCI_UHS2_H */
-- 
2.25.1