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- From 8c4cdce8b1ab044a2ee1d86d5a086f67e32b3c10 Mon Sep 17 00:00:00 2001
- From: Abhishek Sahu <[email protected]>
- Date: Mon, 25 Sep 2017 13:21:25 +0530
- Subject: [PATCH 2/7] mtd: nand: qcom: add command elements in BAM transaction
- All the QPIC register read/write through BAM DMA requires
- command descriptor which contains the array of command elements.
- Reviewed-by: Archit Taneja <[email protected]>
- Signed-off-by: Abhishek Sahu <[email protected]>
- Signed-off-by: Boris Brezillon <[email protected]>
- ---
- drivers/mtd/nand/qcom_nandc.c | 19 ++++++++++++++++++-
- 1 file changed, 18 insertions(+), 1 deletion(-)
- --- a/drivers/mtd/nand/qcom_nandc.c
- +++ b/drivers/mtd/nand/qcom_nandc.c
- @@ -22,6 +22,7 @@
- #include <linux/of.h>
- #include <linux/of_device.h>
- #include <linux/delay.h>
- +#include <linux/dma/qcom_bam_dma.h>
-
- /* NANDc reg offsets */
- #define NAND_FLASH_CMD 0x00
- @@ -199,6 +200,7 @@ nandc_set_reg(nandc, NAND_READ_LOCATION_
- */
- #define dev_cmd_reg_addr(nandc, reg) ((nandc)->props->dev_cmd_reg_start + (reg))
-
- +#define QPIC_PER_CW_CMD_ELEMENTS 32
- #define QPIC_PER_CW_CMD_SGL 32
- #define QPIC_PER_CW_DATA_SGL 8
-
- @@ -221,8 +223,13 @@ nandc_set_reg(nandc, NAND_READ_LOCATION_
- /*
- * This data type corresponds to the BAM transaction which will be used for all
- * NAND transfers.
- + * @bam_ce - the array of BAM command elements
- * @cmd_sgl - sgl for NAND BAM command pipe
- * @data_sgl - sgl for NAND BAM consumer/producer pipe
- + * @bam_ce_pos - the index in bam_ce which is available for next sgl
- + * @bam_ce_start - the index in bam_ce which marks the start position ce
- + * for current sgl. It will be used for size calculation
- + * for current sgl
- * @cmd_sgl_pos - current index in command sgl.
- * @cmd_sgl_start - start index in command sgl.
- * @tx_sgl_pos - current index in data sgl for tx.
- @@ -231,8 +238,11 @@ nandc_set_reg(nandc, NAND_READ_LOCATION_
- * @rx_sgl_start - start index in data sgl for rx.
- */
- struct bam_transaction {
- + struct bam_cmd_element *bam_ce;
- struct scatterlist *cmd_sgl;
- struct scatterlist *data_sgl;
- + u32 bam_ce_pos;
- + u32 bam_ce_start;
- u32 cmd_sgl_pos;
- u32 cmd_sgl_start;
- u32 tx_sgl_pos;
- @@ -462,7 +472,8 @@ alloc_bam_transaction(struct qcom_nand_c
-
- bam_txn_size =
- sizeof(*bam_txn) + num_cw *
- - ((sizeof(*bam_txn->cmd_sgl) * QPIC_PER_CW_CMD_SGL) +
- + ((sizeof(*bam_txn->bam_ce) * QPIC_PER_CW_CMD_ELEMENTS) +
- + (sizeof(*bam_txn->cmd_sgl) * QPIC_PER_CW_CMD_SGL) +
- (sizeof(*bam_txn->data_sgl) * QPIC_PER_CW_DATA_SGL));
-
- bam_txn_buf = devm_kzalloc(nandc->dev, bam_txn_size, GFP_KERNEL);
- @@ -472,6 +483,10 @@ alloc_bam_transaction(struct qcom_nand_c
- bam_txn = bam_txn_buf;
- bam_txn_buf += sizeof(*bam_txn);
-
- + bam_txn->bam_ce = bam_txn_buf;
- + bam_txn_buf +=
- + sizeof(*bam_txn->bam_ce) * QPIC_PER_CW_CMD_ELEMENTS * num_cw;
- +
- bam_txn->cmd_sgl = bam_txn_buf;
- bam_txn_buf +=
- sizeof(*bam_txn->cmd_sgl) * QPIC_PER_CW_CMD_SGL * num_cw;
- @@ -489,6 +504,8 @@ static void clear_bam_transaction(struct
- if (!nandc->props->is_bam)
- return;
-
- + bam_txn->bam_ce_pos = 0;
- + bam_txn->bam_ce_start = 0;
- bam_txn->cmd_sgl_pos = 0;
- bam_txn->cmd_sgl_start = 0;
- bam_txn->tx_sgl_pos = 0;
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