Re: [PATCH v2 08/14] soc: mediatek: cmdq: add write_s function

Bibby Hsieh
2019-12-10T07:35:17Z

On Wed, 2019-11-27 at 09:58 +0800, Dennis YC Hsieh wrote:
> add write_s function in cmdq helper functions which
> writes value contains in internal register to address
> with large dma access support.
>
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> ---
> drivers/soc/mediatek/mtk-cmdq-helper.c | 40 ++++++++++++++++++++++++
> include/linux/mailbox/mtk-cmdq-mailbox.h | 2 ++
> include/linux/soc/mediatek/mtk-cmdq.h | 12 +++++++
> 3 files changed, 54 insertions(+)
>
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 9cc234f08ec5..2edbc0954d97 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -15,11 +15,18 @@
> #define CMDQ_EOC_CMD ((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
> << 32 | CMDQ_EOC_IRQ_EN)
> #define CMDQ_REG_TYPE 1
> +#define CMDQ_ADDR_HIGH(addr) ((u32)(((addr) >> 16) & GENMASK(31, 0)))
> +#define CMDQ_ADDR_LOW_BIT BIT(1)
> +#define CMDQ_ADDR_LOW(addr) ((u16)(addr) | CMDQ_ADDR_LOW_BIT)
>
> struct cmdq_instruction {
> union {
> u32 value;
> u32 mask;
> + struct {
> + u16 arg_c;
> + u16 arg_b;
> + };
> };
> union {
> u16 offset;
> @@ -224,6 +231,39 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
> }
> EXPORT_SYMBOL(cmdq_pkt_write_mask);
>
> +int cmdq_pkt_write_s(struct cmdq_pkt *pkt, phys_addr_t addr, u16 reg_idx,
> + u32 mask)
> +{
> + struct cmdq_instruction inst = { {0} };
> + const u16 dst_reg_idx = CMDQ_SPR_TEMP;
> + int err;
> +
> + if (mask != U32_MAX) {
> + inst.op = CMDQ_CODE_MASK;
> + inst.mask = ~mask;
> + err = cmdq_pkt_append_command(pkt, inst);
> + if (err < 0)
> + return err;
> +
> + inst.mask = 0;
> + inst.op = CMDQ_CODE_WRITE_S_MASK;
> + } else {
> + inst.op = CMDQ_CODE_WRITE_S;
> + }
> +
> + err = cmdq_pkt_assign(pkt, dst_reg_idx, CMDQ_ADDR_HIGH(addr));
> + if (err < 0)
> + return err;
> +
> + inst.arg_b_t = CMDQ_REG_TYPE;
> + inst.sop = dst_reg_idx;
> + inst.offset = CMDQ_ADDR_LOW(addr);
> + inst.arg_b = reg_idx;
> +
> + return cmdq_pkt_append_command(pkt, inst);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_write_s);
> +
> int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
> {
> struct cmdq_instruction inst = { {0} };
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index 121c3bb6d3de..8ef87e1bd03b 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -59,6 +59,8 @@ enum cmdq_code {
> CMDQ_CODE_JUMP = 0x10,
> CMDQ_CODE_WFE = 0x20,
> CMDQ_CODE_EOC = 0x40,
> + CMDQ_CODE_WRITE_S = 0x90,
> + CMDQ_CODE_WRITE_S_MASK = 0x91,
> CMDQ_CODE_LOGIC = 0xa0,
> };
>
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index c66b3a0da2a2..56ff1970197c 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -106,6 +106,18 @@ int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value);
> int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
> u16 offset, u32 value, u32 mask);
>
> +/**
> + * cmdq_pkt_write_s_mask() - append write_s command to the CMDQ packet
I think we need add more descriptions about difference between write.

Bibby
> + * @pkt: the CMDQ packet
> + * @addr: the physical address of register or dma
> + * @reg_idx: the CMDQ internal register ID which cache source value
> + * @mask: the specified target register mask
> + *
> + * Return: 0 for success; else the error code is returned
> + */
> +int cmdq_pkt_write_s(struct cmdq_pkt *pkt, phys_addr_t addr, u16 reg_idx,
> + u32 mask);
> +
> /**
> * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> * @pkt: the CMDQ packet