[PATCH V20 18/22] mmc: sdhci-uhs2: add add_host() and others to set up the driver

Victor Shih
2024-09-05T10:21:24Z

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 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 | 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 b732a3912750..a9ec78dbcae0 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"
@@ -1167,6 +1168,103 @@ 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 (!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;
+
+ /* 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 077a2c7a6cb0..1f3155307fb2 100644
--- a/drivers/mmc/host/sdhci-uhs2.h
+++ b/drivers/mmc/host/sdhci-uhs2.h
@@ -184,5 +184,7 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned
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 442a89234b54..f4a7733a8ad2 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -4098,6 +4098,9 @@ 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;
}

@@ -4862,7 +4865,7 @@ 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);
@@ -4871,7 +4874,7 @@ 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 941723cea698..c5e987dce927 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -625,6 +625,9 @@ 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