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.chu...@genesyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
---
 drivers/mmc/host/sdhci-uhs2.c | 198 ++++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h |   2 +
 drivers/mmc/host/sdhci.c      |  24 +++--
 drivers/mmc/host/sdhci.h      |  10 ++
 4 files changed, 226 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index d50134e912f3..5d3362ea138f 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -15,6 +15,7 @@
 #include <linux/ktime.h>
 #include <linux/module.h>
 #include <linux/mmc/mmc.h>
+#include <linux/regulator/consumer.h>
 
 #include "sdhci.h"
 #include "sdhci-uhs2.h"
@@ -406,6 +407,15 @@ static inline void sdhci_led_deactivate(struct sdhci_host 
*host)
 {
 }
 #else
+static inline int sdhci_led_register(struct sdhci_host *host)
+{
+       return 0;
+}
+
+static inline void sdhci_led_unregister(struct sdhci_host *host)
+{
+}
+
 static inline void sdhci_led_activate(struct sdhci_host *host)
 {
        __sdhci_led_activate(host);
@@ -1298,6 +1308,194 @@ static irqreturn_t sdhci_uhs2_thread_irq(int irq, void 
*dev_id)
        return IRQ_HANDLED;
 }
 
+/*****************************************************************************\
+ *
+ * Device allocation/registration                                            *
+ *                                                                           *
+\*****************************************************************************/
+
+static int __sdhci_uhs2_add_host_v4(struct sdhci_host *host, u32 caps1)
+{
+       struct mmc_host *mmc;
+       u32 max_current_caps2;
+
+       if (host->version < SDHCI_SPEC_400)
+               return 0;
+
+       mmc = host->mmc;
+
+       /* Support UHS2 */
+       if (caps1 & SDHCI_SUPPORT_UHS2)
+               mmc->caps |= MMC_CAP_UHS2;
+
+       max_current_caps2 = sdhci_readl(host, SDHCI_MAX_CURRENT_1);
+
+       if ((caps1 & SDHCI_SUPPORT_VDD2_180) &&
+           !max_current_caps2 &&
+           !IS_ERR(mmc->supply.vmmc2)) {
+               /* UHS2 - VDD2 */
+               int curr = regulator_get_current_limit(mmc->supply.vmmc2);
+
+               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_SUPPORT_VDD2_180) {
+               mmc->ocr_avail_uhs2 |= MMC_VDD2_165_195;
+               /*
+                * UHS2 doesn't require this. Only UHS-I bus needs to set
+                * max current.
+                */
+               mmc->max_current_180_vdd2 = (max_current_caps2 &
+                                       SDHCI_MAX_CURRENT_VDD2_180_MASK) *
+                                       SDHCI_MAX_CURRENT_MULTIPLIER;
+       } else {
+               mmc->caps &= ~MMC_CAP_UHS2;
+       }
+
+       return 0;
+}
+
+static int sdhci_uhs2_host_ops_init(struct sdhci_host *host);
+
+static int __sdhci_uhs2_add_host(struct sdhci_host *host)
+{
+       unsigned int flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI;
+       struct mmc_host *mmc = host->mmc;
+       int ret;
+
+       if ((mmc->caps2 & MMC_CAP2_CQE) &&
+           (host->quirks & SDHCI_QUIRK_BROKEN_CQE)) {
+               mmc->caps2 &= ~MMC_CAP2_CQE;
+               mmc->cqe_ops = NULL;
+       }
+
+       /* overwrite ops */
+       if (mmc->caps & MMC_CAP_UHS2)
+               sdhci_uhs2_host_ops_init(host);
+
+       host->complete_wq = alloc_workqueue("sdhci", flags, 0);
+       if (!host->complete_wq)
+               return -ENOMEM;
+
+       INIT_WORK(&host->complete_work, sdhci_uhs2_complete_work);
+
+       timer_setup(&host->timer, sdhci_timeout_timer, 0);
+       timer_setup(&host->data_timer, sdhci_timeout_data_timer, 0);
+
+       init_waitqueue_head(&host->buf_ready_int);
+
+       sdhci_init(host, 0);
+
+       ret = request_threaded_irq(host->irq, sdhci_irq,
+                                  sdhci_uhs2_thread_irq,
+                                  IRQF_SHARED, mmc_hostname(mmc), host);
+       if (ret) {
+               pr_err("%s: Failed to request IRQ %d: %d\n",
+                      mmc_hostname(mmc), host->irq, ret);
+               goto unwq;
+       }
+
+       ret = sdhci_led_register(host);
+       if (ret) {
+               pr_err("%s: Failed to register LED device: %d\n",
+                      mmc_hostname(mmc), ret);
+               goto unirq;
+       }
+
+       ret = mmc_add_host(mmc);
+       if (ret)
+               goto unled;
+
+       pr_info("%s: SDHCI controller on %s [%s] using %s\n",
+               mmc_hostname(mmc), host->hw_name, dev_name(mmc_dev(mmc)),
+               host->use_external_dma ? "External DMA" :
+               (host->flags & SDHCI_USE_ADMA) ?
+               (host->flags & SDHCI_USE_64_BIT_DMA) ? "ADMA 64-bit" : "ADMA" :
+               (host->flags & SDHCI_USE_SDMA) ? "DMA" : "PIO");
+
+       sdhci_enable_card_detection(host);
+
+       return 0;
+
+unled:
+       sdhci_led_unregister(host);
+unirq:
+       sdhci_do_reset(host, SDHCI_RESET_ALL);
+       sdhci_writel(host, 0, SDHCI_INT_ENABLE);
+       sdhci_writel(host, 0, SDHCI_SIGNAL_ENABLE);
+       free_irq(host->irq, host);
+unwq:
+       destroy_workqueue(host->complete_wq);
+
+       return ret;
+}
+
+static void __sdhci_uhs2_remove_host(struct sdhci_host *host, int dead)
+{
+       if (!(host->mmc) || !(host->mmc->flags & MMC_UHS2_SUPPORT))
+               return;
+
+       if (!dead)
+               sdhci_uhs2_reset(host, SDHCI_UHS2_SW_RESET_FULL);
+
+       sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_STATUS_EN);
+       sdhci_writel(host, 0, SDHCI_UHS2_ERR_INT_SIG_EN);
+       host->mmc->flags &= ~MMC_UHS2_INITIALIZED;
+}
+
+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) {
+               ret = __sdhci_uhs2_add_host_v4(host, host->caps1);
+               if (ret)
+                       goto cleanup;
+       }
+
+       if ((mmc->caps & MMC_CAP_UHS2) && !host->v4_mode)
+               /* host doesn't want to enable UHS2 support */
+               /* FIXME: Do we have to do some cleanup here? */
+               mmc->caps &= ~MMC_CAP_UHS2;
+
+       ret = __sdhci_uhs2_add_host(host);
+       if (ret)
+               goto cleanup2;
+
+       return 0;
+
+cleanup2:
+       /*
+        * TODO: Is this a right cleanup?
+        */
+       if (host->version >= SDHCI_SPEC_400)
+               __sdhci_uhs2_remove_host(host, 0);
+cleanup:
+       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_uhs2_remove_host(host, dead);
+}
+EXPORT_SYMBOL_GPL(sdhci_uhs2_remove_host);
+
 /*****************************************************************************\
  *                                                                           *
  * Driver init/exit                                                          *
diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
index b74af641d00e..34e140f21284 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -218,5 +218,7 @@ void sdhci_uhs2_clear_set_irqs(struct sdhci_host *host, u32 
clear, u32 set);
 void sdhci_uhs2_request(struct mmc_host *mmc, struct mmc_request *mrq);
 int sdhci_uhs2_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq);
 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 e2dfc7767bcf..d37c3edb1ed0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -176,10 +176,11 @@ static void sdhci_set_card_detection(struct sdhci_host 
*host, bool enable)
        sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 }
 
-static void sdhci_enable_card_detection(struct sdhci_host *host)
+void sdhci_enable_card_detection(struct sdhci_host *host)
 {
        sdhci_set_card_detection(host, true);
 }
+EXPORT_SYMBOL_GPL(sdhci_enable_card_detection);
 
 static void sdhci_disable_card_detection(struct sdhci_host *host)
 {
@@ -237,7 +238,7 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
 }
 EXPORT_SYMBOL_GPL(sdhci_reset);
 
-static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
+void sdhci_do_reset(struct sdhci_host *host, u8 mask)
 {
        if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
                struct mmc_host *mmc = host->mmc;
@@ -258,6 +259,7 @@ static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
                host->preset_enabled = false;
        }
 }
+EXPORT_SYMBOL_GPL(sdhci_do_reset);
 
 static void sdhci_set_default_irqs(struct sdhci_host *host)
 {
@@ -321,7 +323,7 @@ static void sdhci_config_dma(struct sdhci_host *host)
        sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 }
 
-static void sdhci_init(struct sdhci_host *host, int soft)
+void sdhci_init(struct sdhci_host *host, int soft)
 {
        struct mmc_host *mmc = host->mmc;
        unsigned long flags;
@@ -346,6 +348,7 @@ static void sdhci_init(struct sdhci_host *host, int soft)
                mmc->ops->set_ios(mmc, &mmc->ios);
        }
 }
+EXPORT_SYMBOL_GPL(sdhci_init);
 
 static void sdhci_reinit(struct sdhci_host *host)
 {
@@ -410,7 +413,7 @@ static void sdhci_led_control(struct led_classdev *led,
        spin_unlock_irqrestore(&host->lock, flags);
 }
 
-static int sdhci_led_register(struct sdhci_host *host)
+int sdhci_led_register(struct sdhci_host *host)
 {
        struct mmc_host *mmc = host->mmc;
 
@@ -427,14 +430,16 @@ static int sdhci_led_register(struct sdhci_host *host)
 
        return led_classdev_register(mmc_dev(mmc), &host->led);
 }
+EXPORT_SYMBOL_GPL(sdhci_led_register);
 
-static void sdhci_led_unregister(struct sdhci_host *host)
+void sdhci_led_unregister(struct sdhci_host *host)
 {
        if (host->quirks & SDHCI_QUIRK_NO_LED)
                return;
 
        led_classdev_unregister(&host->led);
 }
+EXPORT_SYMBOL_GPL(sdhci_led_unregister);
 
 static inline void sdhci_led_activate(struct sdhci_host *host)
 {
@@ -3175,7 +3180,7 @@ static void sdhci_complete_work(struct work_struct *work)
                ;
 }
 
-static void sdhci_timeout_timer(struct timer_list *t)
+void sdhci_timeout_timer(struct timer_list *t)
 {
        struct sdhci_host *host;
        unsigned long flags;
@@ -3195,8 +3200,9 @@ static void sdhci_timeout_timer(struct timer_list *t)
 
        spin_unlock_irqrestore(&host->lock, flags);
 }
+EXPORT_SYMBOL_GPL(sdhci_timeout_timer);
 
-static void sdhci_timeout_data_timer(struct timer_list *t)
+void sdhci_timeout_data_timer(struct timer_list *t)
 {
        struct sdhci_host *host;
        unsigned long flags;
@@ -3226,6 +3232,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
 
        spin_unlock_irqrestore(&host->lock, flags);
 }
+EXPORT_SYMBOL_GPL(sdhci_timeout_data_timer);
 
 /*****************************************************************************\
  *                                                                           *
@@ -3469,7 +3476,7 @@ static inline bool sdhci_defer_done(struct sdhci_host 
*host,
                data->host_cookie == COOKIE_MAPPED);
 }
 
-static irqreturn_t sdhci_irq(int irq, void *dev_id)
+irqreturn_t sdhci_irq(int irq, void *dev_id)
 {
        struct mmc_request *mrqs_done[SDHCI_MAX_MRQS] = {0};
        irqreturn_t result = IRQ_NONE;
@@ -3609,6 +3616,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 
        return result;
 }
+EXPORT_SYMBOL_GPL(sdhci_irq);
 
 static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
 {
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 74572b54ec47..b1d856664b58 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -832,8 +832,15 @@ static inline void sdhci_read_caps(struct sdhci_host *host)
 }
 
 bool sdhci_data_line_cmd(struct mmc_command *cmd);
+void sdhci_enable_card_detection(struct sdhci_host *host);
 void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
 void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
+void sdhci_do_reset(struct sdhci_host *host, u8 mask);
+void sdhci_init(struct sdhci_host *host, int soft);
+#if IS_REACHABLE(CONFIG_LEDS_CLASS)
+int sdhci_led_register(struct sdhci_host *host);
+void sdhci_led_unregister(struct sdhci_host *host);
+#endif
 void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
                      unsigned long timeout);
 void sdhci_initialize_data(struct sdhci_host *host, struct mmc_data *data);
@@ -884,6 +891,9 @@ int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
 void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable);
 void sdhci_request_done_dma(struct sdhci_host *host, struct mmc_request *mrq);
 bool sdhci_request_done(struct sdhci_host *host);
+void sdhci_timeout_timer(struct timer_list *t);
+void sdhci_timeout_data_timer(struct timer_list *t);
+irqreturn_t sdhci_irq(int irq, void *dev_id);
 void sdhci_adma_write_desc(struct sdhci_host *host, void **desc,
                           dma_addr_t addr, int len, unsigned int cmd);
 
-- 
2.28.0

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