lkml.org 
[lkml]   [2017]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [PATCH 07/14] qcom: mtd: nand: support for passing flags in transfer functions
From
Date


On 06/29/2017 12:45 PM, Abhishek Sahu wrote:
> The BAM has multiple flags to control the transfer. This patch
> adds flags parameter in register and data transfer functions and
> modifies all these function call with appropriate flags.
>
> Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
> ---
> drivers/mtd/nand/qcom_nandc.c | 114 ++++++++++++++++++++++++------------------
> 1 file changed, 65 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c
> index 7042a65..65c9059 100644
> --- a/drivers/mtd/nand/qcom_nandc.c
> +++ b/drivers/mtd/nand/qcom_nandc.c
> @@ -170,6 +170,14 @@
> #define ECC_BCH_4BIT BIT(2)
> #define ECC_BCH_8BIT BIT(3)
>
> +/* Flags used for BAM DMA desc preparation*/
> +/* Don't set the EOT in current tx sgl */
> +#define NAND_BAM_NO_EOT (0x0001)
> +/* Set the NWD flag in current sgl */
> +#define NAND_BAM_NWD (0x0002)
> +/* Finish writing in the current sgl and start writing in another sgl */
> +#define NAND_BAM_NEXT_SGL (0x0004)
> +
> #define QPIC_PER_CW_MAX_CMD_ELEMENTS (32)
> #define QPIC_PER_CW_MAX_CMD_SGL (32)
> #define QPIC_PER_CW_MAX_DATA_SGL (8)
> @@ -712,7 +720,7 @@ static int prep_dma_desc(struct qcom_nand_controller *nandc, bool read,
> * @num_regs: number of registers to read
> */
> static int read_reg_dma(struct qcom_nand_controller *nandc, int first,
> - int num_regs)
> + int num_regs, unsigned int flags)
> {
> bool flow_control = false;
> void *vaddr;
> @@ -736,7 +744,7 @@ static int read_reg_dma(struct qcom_nand_controller *nandc, int first,
> * @num_regs: number of registers to write
> */
> static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
> - int num_regs)
> + int num_regs, unsigned int flags)

Adding flags to read_reg_dma and write_reg_dma is making things a bit messy. I can't
think of a better way to share the code either, though.

One thing we could consider doing is something like below. I don't know if it would
make things more legible.

union nand_dma_props {
bool adm_flow_control;
unsigned int bam_flags;
};

config_cw_read()
{
union nand_dma_props dma_props;
...
...

if (is_bam)
dma_props.bam_flags = NAND_BAM_NWD;
else
dma_props.adm_flow_control = false;

write_reg_dma(nandc, NAND_EXEC_CMD, 1, &dma_props);
...
...
}

Thanks,
Archit

> {
> bool flow_control = false;
> struct nandc_regs *regs = nandc->regs;
> @@ -748,6 +756,9 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
> if (first == NAND_FLASH_CMD)
> flow_control = true;
>
> + if (first == NAND_EXEC_CMD)
> + flags |= NAND_BAM_NWD;
> +
> if (first == NAND_DEV_CMD1_RESTORE)
> first = NAND_DEV_CMD1;
>
> @@ -768,7 +779,7 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first,
> * @size: DMA transaction size in bytes
> */
> static int read_data_dma(struct qcom_nand_controller *nandc, int reg_off,
> - const u8 *vaddr, int size)
> + const u8 *vaddr, int size, unsigned int flags)
> {
> return prep_dma_desc(nandc, true, reg_off, vaddr, size, false);
> }
> @@ -782,7 +793,7 @@ static int read_data_dma(struct qcom_nand_controller *nandc, int reg_off,
> * @size: DMA transaction size in bytes
> */
> static int write_data_dma(struct qcom_nand_controller *nandc, int reg_off,
> - const u8 *vaddr, int size)
> + const u8 *vaddr, int size, unsigned int flags)
> {
> return prep_dma_desc(nandc, false, reg_off, vaddr, size, false);
> }
> @@ -793,14 +804,16 @@ static int write_data_dma(struct qcom_nand_controller *nandc, int reg_off,
> */
> static void config_cw_read(struct qcom_nand_controller *nandc)
> {
> - write_reg_dma(nandc, NAND_FLASH_CMD, 3);
> - write_reg_dma(nandc, NAND_DEV0_CFG0, 3);
> - write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1);
> + write_reg_dma(nandc, NAND_FLASH_CMD, 3, 0);
> + write_reg_dma(nandc, NAND_DEV0_CFG0, 3, 0);
> + write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1, 0);
>
> - write_reg_dma(nandc, NAND_EXEC_CMD, 1);
> + write_reg_dma(nandc, NAND_EXEC_CMD, 1,
> + NAND_BAM_NWD | NAND_BAM_NEXT_SGL);
>
> - read_reg_dma(nandc, NAND_FLASH_STATUS, 2);
> - read_reg_dma(nandc, NAND_ERASED_CW_DETECT_STATUS, 1);
> + read_reg_dma(nandc, NAND_FLASH_STATUS, 2, 0);
> + read_reg_dma(nandc, NAND_ERASED_CW_DETECT_STATUS, 1,
> + NAND_BAM_NEXT_SGL);
> }
>
> /*
> @@ -809,19 +822,20 @@ static void config_cw_read(struct qcom_nand_controller *nandc)
> */
> static void config_cw_write_pre(struct qcom_nand_controller *nandc)
> {
> - write_reg_dma(nandc, NAND_FLASH_CMD, 3);
> - write_reg_dma(nandc, NAND_DEV0_CFG0, 3);
> - write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1);
> + write_reg_dma(nandc, NAND_FLASH_CMD, 3, 0);
> + write_reg_dma(nandc, NAND_DEV0_CFG0, 3, 0);
> + write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1,
> + NAND_BAM_NEXT_SGL);
> }
>
> static void config_cw_write_post(struct qcom_nand_controller *nandc)
> {
> - write_reg_dma(nandc, NAND_EXEC_CMD, 1);
> + write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
>
> - read_reg_dma(nandc, NAND_FLASH_STATUS, 1);
> + read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
>
> - write_reg_dma(nandc, NAND_FLASH_STATUS, 1);
> - write_reg_dma(nandc, NAND_READ_STATUS, 1);
> + write_reg_dma(nandc, NAND_FLASH_STATUS, 1, 0);
> + write_reg_dma(nandc, NAND_READ_STATUS, 1, NAND_BAM_NEXT_SGL);
> }
>
> /*
> @@ -869,8 +883,8 @@ static int nandc_param(struct qcom_nand_host *host)
> nandc_set_reg(nandc, NAND_DEV_CMD1_RESTORE, nandc->cmd1);
> nandc_set_reg(nandc, NAND_DEV_CMD_VLD_RESTORE, nandc->vld);
>
> - write_reg_dma(nandc, NAND_DEV_CMD_VLD, 1);
> - write_reg_dma(nandc, NAND_DEV_CMD1, 1);
> + write_reg_dma(nandc, NAND_DEV_CMD_VLD, 1, 0);
> + write_reg_dma(nandc, NAND_DEV_CMD1, 1, NAND_BAM_NEXT_SGL);
>
> nandc->buf_count = 512;
> memset(nandc->data_buffer, 0xff, nandc->buf_count);
> @@ -878,11 +892,11 @@ static int nandc_param(struct qcom_nand_host *host)
> config_cw_read(nandc);
>
> read_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer,
> - nandc->buf_count);
> + nandc->buf_count, 0);
>
> /* restore CMD1 and VLD regs */
> - write_reg_dma(nandc, NAND_DEV_CMD1_RESTORE, 1);
> - write_reg_dma(nandc, NAND_DEV_CMD_VLD_RESTORE, 1);
> + write_reg_dma(nandc, NAND_DEV_CMD1_RESTORE, 1, 0);
> + write_reg_dma(nandc, NAND_DEV_CMD_VLD_RESTORE, 1, NAND_BAM_NEXT_SGL);
>
> return 0;
> }
> @@ -904,14 +918,14 @@ static int erase_block(struct qcom_nand_host *host, int page_addr)
> nandc_set_reg(nandc, NAND_FLASH_STATUS, host->clrflashstatus);
> nandc_set_reg(nandc, NAND_READ_STATUS, host->clrreadstatus);
>
> - write_reg_dma(nandc, NAND_FLASH_CMD, 3);
> - write_reg_dma(nandc, NAND_DEV0_CFG0, 2);
> - write_reg_dma(nandc, NAND_EXEC_CMD, 1);
> + write_reg_dma(nandc, NAND_FLASH_CMD, 3, NAND_BAM_NEXT_SGL);
> + write_reg_dma(nandc, NAND_DEV0_CFG0, 2, NAND_BAM_NEXT_SGL);
> + write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
>
> - read_reg_dma(nandc, NAND_FLASH_STATUS, 1);
> + read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
>
> - write_reg_dma(nandc, NAND_FLASH_STATUS, 1);
> - write_reg_dma(nandc, NAND_READ_STATUS, 1);
> + write_reg_dma(nandc, NAND_FLASH_STATUS, 1, 0);
> + write_reg_dma(nandc, NAND_READ_STATUS, 1, NAND_BAM_NEXT_SGL);
>
> return 0;
> }
> @@ -931,10 +945,10 @@ static int read_id(struct qcom_nand_host *host, int column)
> nandc_set_reg(nandc, NAND_FLASH_CHIP_SELECT, DM_EN);
> nandc_set_reg(nandc, NAND_EXEC_CMD, 1);
>
> - write_reg_dma(nandc, NAND_FLASH_CMD, 4);
> - write_reg_dma(nandc, NAND_EXEC_CMD, 1);
> + write_reg_dma(nandc, NAND_FLASH_CMD, 4, NAND_BAM_NEXT_SGL);
> + write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
>
> - read_reg_dma(nandc, NAND_READ_ID, 1);
> + read_reg_dma(nandc, NAND_READ_ID, 1, NAND_BAM_NEXT_SGL);
>
> return 0;
> }
> @@ -948,10 +962,10 @@ static int reset(struct qcom_nand_host *host)
> nandc_set_reg(nandc, NAND_FLASH_CMD, RESET_DEVICE);
> nandc_set_reg(nandc, NAND_EXEC_CMD, 1);
>
> - write_reg_dma(nandc, NAND_FLASH_CMD, 1);
> - write_reg_dma(nandc, NAND_EXEC_CMD, 1);
> + write_reg_dma(nandc, NAND_FLASH_CMD, 1, NAND_BAM_NEXT_SGL);
> + write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
>
> - read_reg_dma(nandc, NAND_FLASH_STATUS, 1);
> + read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
>
> return 0;
> }
> @@ -1344,7 +1358,7 @@ static int read_page_ecc(struct qcom_nand_host *host, u8 *data_buf,
>
> if (data_buf)
> read_data_dma(nandc, FLASH_BUF_ACC, data_buf,
> - data_size);
> + data_size, 0);
>
> /*
> * when ecc is enabled, the controller doesn't read the real
> @@ -1360,7 +1374,7 @@ static int read_page_ecc(struct qcom_nand_host *host, u8 *data_buf,
> *oob_buf++ = 0xff;
>
> read_data_dma(nandc, FLASH_BUF_ACC + data_size,
> - oob_buf, oob_size);
> + oob_buf, oob_size, 0);
> }
>
> if (data_buf)
> @@ -1402,7 +1416,7 @@ static int copy_last_cw(struct qcom_nand_host *host, int page)
>
> config_cw_read(nandc);
>
> - read_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer, size);
> + read_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer, size, 0);
>
> ret = submit_descs(nandc);
> if (ret)
> @@ -1470,19 +1484,19 @@ static int qcom_nandc_read_page_raw(struct mtd_info *mtd,
>
> config_cw_read(nandc);
>
> - read_data_dma(nandc, reg_off, data_buf, data_size1);
> + read_data_dma(nandc, reg_off, data_buf, data_size1, 0);
> reg_off += data_size1;
> data_buf += data_size1;
>
> - read_data_dma(nandc, reg_off, oob_buf, oob_size1);
> + read_data_dma(nandc, reg_off, oob_buf, oob_size1, 0);
> reg_off += oob_size1;
> oob_buf += oob_size1;
>
> - read_data_dma(nandc, reg_off, data_buf, data_size2);
> + read_data_dma(nandc, reg_off, data_buf, data_size2, 0);
> reg_off += data_size2;
> data_buf += data_size2;
>
> - read_data_dma(nandc, reg_off, oob_buf, oob_size2);
> + read_data_dma(nandc, reg_off, oob_buf, oob_size2, 0);
> oob_buf += oob_size2;
> }
>
> @@ -1549,7 +1563,8 @@ static int qcom_nandc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
>
> config_cw_write_pre(nandc);
>
> - write_data_dma(nandc, FLASH_BUF_ACC, data_buf, data_size);
> + write_data_dma(nandc, FLASH_BUF_ACC, data_buf, data_size,
> + i == (ecc->steps - 1) ? NAND_BAM_NO_EOT : 0);
>
> /*
> * when ECC is enabled, we don't really need to write anything
> @@ -1562,7 +1577,7 @@ static int qcom_nandc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
> oob_buf += host->bbm_size;
>
> write_data_dma(nandc, FLASH_BUF_ACC + data_size,
> - oob_buf, oob_size);
> + oob_buf, oob_size, 0);
> }
>
> config_cw_write_post(nandc);
> @@ -1618,19 +1633,19 @@ static int qcom_nandc_write_page_raw(struct mtd_info *mtd,
>
> config_cw_write_pre(nandc);
>
> - write_data_dma(nandc, reg_off, data_buf, data_size1);
> + write_data_dma(nandc, reg_off, data_buf, data_size1, 0);
> reg_off += data_size1;
> data_buf += data_size1;
>
> - write_data_dma(nandc, reg_off, oob_buf, oob_size1);
> + write_data_dma(nandc, reg_off, oob_buf, oob_size1, 0);
> reg_off += oob_size1;
> oob_buf += oob_size1;
>
> - write_data_dma(nandc, reg_off, data_buf, data_size2);
> + write_data_dma(nandc, reg_off, data_buf, data_size2, 0);
> reg_off += data_size2;
> data_buf += data_size2;
>
> - write_data_dma(nandc, reg_off, oob_buf, oob_size2);
> + write_data_dma(nandc, reg_off, oob_buf, oob_size2, 0);
> oob_buf += oob_size2;
>
> config_cw_write_post(nandc);
> @@ -1685,7 +1700,7 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
>
> config_cw_write_pre(nandc);
> write_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer,
> - data_size + oob_size);
> + data_size + oob_size, 0);
> config_cw_write_post(nandc);
>
> ret = submit_descs(nandc);
> @@ -1769,7 +1784,8 @@ static int qcom_nandc_block_markbad(struct mtd_info *mtd, loff_t ofs)
> update_rw_regs(host, 1, false);
>
> config_cw_write_pre(nandc);
> - write_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer, host->cw_size);
> + write_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer,
> + host->cw_size, 0);
> config_cw_write_post(nandc);
>
> ret = submit_descs(nandc);
>

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

\
 
 \ /
  Last update: 2017-07-04 08:50    [W:0.224 / U:2.976 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site