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soc: mediatek: cmdq: add jump function

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Add jump function so that client can jump to any address which
contains instruction.

Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
Link: https://lore.kernel.org/r/1594136714-11650-8-git-send-email-dennis-yc.hsieh@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
This commit is contained in:
Dennis YC Hsieh 2020-07-07 23:45:12 +08:00 committed by Matthias Brugger
parent 88a2ffc48d
commit 946f1792d3
2 changed files with 24 additions and 0 deletions
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13
drivers/soc/mediatek/mtk-cmdq-helper.c
View File

@ -13,6 +13,7 @@
#define CMDQ_POLL_ENABLE_MASK BIT(0)
#define CMDQ_EOC_IRQ_EN BIT(0)
#define CMDQ_REG_TYPE 1
#define CMDQ_JUMP_RELATIVE 1
struct cmdq_instruction {
union {
@ -407,6 +408,18 @@ int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
}
EXPORT_SYMBOL(cmdq_pkt_assign);
int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr)
{
struct cmdq_instruction inst = {};
inst.op = CMDQ_CODE_JUMP;
inst.offset = CMDQ_JUMP_RELATIVE;
inst.value = addr >>
cmdq_get_shift_pa(((struct cmdq_client *)pkt->cl)->chan);
return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_jump);
int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
{
struct cmdq_instruction inst = { {0} };

11
include/linux/soc/mediatek/mtk-cmdq.h
View File

@ -252,6 +252,17 @@ int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
*/
int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
/**
* cmdq_pkt_jump() - Append jump command to the CMDQ packet, ask GCE
* to execute an instruction that change current thread PC to
* a physical address which should contains more instruction.
* @pkt: the CMDQ packet
* @addr: physical address of target instruction buffer
*
* Return: 0 for success; else the error code is returned
*/
int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr);
/**
* cmdq_pkt_finalize() - Append EOC and jump command to pkt.
* @pkt: the CMDQ packet