[PATCH v7][1/4] mmc: solve DMA boundary limitation of CQHCI driver

Jyan Chou
2023-11-21T09:12:53Z

Due to synopsys data book's description, it had a limitation
while using DMA that buffer size and start address must not
exceed 128 MB.

We add an option setup_tran_desc to make tran_desc setting flexible.

Signed-off-by: Jyan Chou <jyanchou@realtek.com>

---
v6 -> v7:
- fix kernel test robot build errors, error: no member named
'setup_tran_desc' in 'struct cqhci_host_ops'

v4 -> v5:
- use EXPORT_SYMBOL_GPL to replace EXPORT_SYMBOL
- Fix kernel test robot build errors, let 'setup_tran_desc' to be a member in
'const struct cqhci_host_ops'.

v2 -> v3:
- Fix auto test compile warning.

v1 -> v2:
- Export cqhci_set_tran_desc for setting the descriptor's callback function.

v0 -> v1:
- Separate different patch supports into single patch.
---
drivers/mmc/host/cqhci-core.c | 13 ++++++++++---
drivers/mmc/host/cqhci.h | 8 ++++++++
2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index b3d7d6d8d654..b40bd368a955 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -474,8 +474,7 @@ static int cqhci_dma_map(struct mmc_host *host, struct mmc_request *mrq)
return sg_count;
}

-static void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
- bool dma64)
+void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end, bool dma64)
{
__le32 *attr = (__le32 __force *)desc;

@@ -495,9 +494,10 @@ static void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
dataddr[0] = cpu_to_le32(addr);
}
}
+EXPORT_SYMBOL_GPL(cqhci_set_tran_desc);

static int cqhci_prep_tran_desc(struct mmc_request *mrq,
- struct cqhci_host *cq_host, int tag)
+ struct cqhci_host *cq_host, int tag)
{
struct mmc_data *data = mrq->data;
int i, sg_count, len;
@@ -516,6 +516,13 @@ static int cqhci_prep_tran_desc(struct mmc_request *mrq,

desc = get_trans_desc(cq_host, tag);

+#ifdef CONFIG_MMC_DW_CQE
+ if (cq_host->ops->setup_tran_desc) {
+ cq_host->ops->setup_tran_desc(data, cq_host, desc, sg_count);
+ return 0;
+ }
+#endif
+
for_each_sg(data->sg, sg, sg_count, i) {
addr = sg_dma_address(sg);
len = sg_dma_len(sg);
diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
index 1a12e40a02e6..713fc56127df 100644
--- a/drivers/mmc/host/cqhci.h
+++ b/drivers/mmc/host/cqhci.h
@@ -216,6 +216,7 @@ union cqhci_crypto_cfg_entry {
struct cqhci_host_ops;
struct mmc_host;
struct mmc_request;
+struct mmc_data;
struct cqhci_slot;

struct cqhci_host {
@@ -293,6 +294,11 @@ struct cqhci_host_ops {
int (*program_key)(struct cqhci_host *cq_host,
const union cqhci_crypto_cfg_entry *cfg, int slot);
#endif
+
+#ifdef CONFIG_MMC_DW_CQE
+ void (*setup_tran_desc)(struct mmc_data *data,
+ struct cqhci_host *cq_host, u8 *desc, int sg_count);
+#endif
};

static inline void cqhci_writel(struct cqhci_host *host, u32 val, int reg)
@@ -322,6 +328,8 @@ static inline int cqhci_suspend(struct mmc_host *mmc)
{
return cqhci_deactivate(mmc);
}
+
+void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end, bool dma64);
int cqhci_resume(struct mmc_host *mmc);

#endif
--
2.42.0