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Date: Wed, 11 Dec 2019 19:39:55 +0100
From: Matthias Brugger <matthias.bgg@...il.com>
To: CK Hu <ck.hu@...iatek.com>, Bibby Hsieh <bibby.hsieh@...iatek.com>
Cc: Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
Nicolas Boichat <drinkcat@...omium.org>,
Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>
Subject: Re: [PATCH v17 3/6] soc: mediatek: cmdq: define the instruction
struct
On 22/11/2019 09:30, CK Hu wrote:
> Hi, Bibby:
>
> On Thu, 2019-11-21 at 09:54 +0800, Bibby Hsieh wrote:
>> Define an instruction structure for gce driver to append command.
>> This structure can make the client's code more readability.
>
> Even though I do not like pass struct parameter by value, but struct
> cmdq_instruction is just a 64 bits integer and would not be modified in
> cmdq_pkt_append_command(), so
>
> Reviewed-by: CK Hu <ck.hu@...iatek.com>
>
Applied to v5.5-next/soc
Thanks!
>>
>> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
>> ---
>> drivers/soc/mediatek/mtk-cmdq-helper.c | 73 ++++++++++++++++--------
>> include/linux/mailbox/mtk-cmdq-mailbox.h | 10 ++++
>> 2 files changed, 59 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
>> index c8fb69787649..11bfcc150ebd 100644
>> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
>> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
>> @@ -9,12 +9,24 @@
>> #include <linux/mailbox_controller.h>
>> #include <linux/soc/mediatek/mtk-cmdq.h>
>>
>> -#define CMDQ_ARG_A_WRITE_MASK 0xffff
>> #define CMDQ_WRITE_ENABLE_MASK BIT(0)
>> #define CMDQ_EOC_IRQ_EN BIT(0)
>> #define CMDQ_EOC_CMD ((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
>> << 32 | CMDQ_EOC_IRQ_EN)
>>
>> +struct cmdq_instruction {
>> + union {
>> + u32 value;
>> + u32 mask;
>> + };
>> + union {
>> + u16 offset;
>> + u16 event;
>> + };
>> + u8 subsys;
>> + u8 op;
>> +};
>> +
>> static void cmdq_client_timeout(struct timer_list *t)
>> {
>> struct cmdq_client *client = from_timer(client, t, timer);
>> @@ -110,10 +122,10 @@ void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
>> }
>> EXPORT_SYMBOL(cmdq_pkt_destroy);
>>
>> -static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
>> - u32 arg_a, u32 arg_b)
>> +static int cmdq_pkt_append_command(struct cmdq_pkt *pkt,
>> + struct cmdq_instruction inst)
>> {
>> - u64 *cmd_ptr;
>> + struct cmdq_instruction *cmd_ptr;
>>
>> if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
>> /*
>> @@ -129,8 +141,9 @@ static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
>> __func__, (u32)pkt->buf_size);
>> return -ENOMEM;
>> }
>> +
>> cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
>> - (*cmd_ptr) = (u64)((code << CMDQ_OP_CODE_SHIFT) | arg_a) << 32 | arg_b;
>> + *cmd_ptr = inst;
>> pkt->cmd_buf_size += CMDQ_INST_SIZE;
>>
>> return 0;
>> @@ -138,21 +151,28 @@ static int cmdq_pkt_append_command(struct cmdq_pkt *pkt, enum cmdq_code code,
>>
>> int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
>> {
>> - u32 arg_a = (offset & CMDQ_ARG_A_WRITE_MASK) |
>> - (subsys << CMDQ_SUBSYS_SHIFT);
>> + struct cmdq_instruction inst;
>>
>> - return cmdq_pkt_append_command(pkt, CMDQ_CODE_WRITE, arg_a, value);
>> + inst.op = CMDQ_CODE_WRITE;
>> + inst.value = value;
>> + inst.offset = offset;
>> + inst.subsys = subsys;
>> +
>> + return cmdq_pkt_append_command(pkt, inst);
>> }
>> EXPORT_SYMBOL(cmdq_pkt_write);
>>
>> int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
>> u16 offset, u32 value, u32 mask)
>> {
>> - u32 offset_mask = offset;
>> + struct cmdq_instruction inst = { {0} };
>> + u16 offset_mask = offset;
>> int err;
>>
>> if (mask != 0xffffffff) {
>> - err = cmdq_pkt_append_command(pkt, CMDQ_CODE_MASK, 0, ~mask);
>> + inst.op = CMDQ_CODE_MASK;
>> + inst.mask = ~mask;
>> + err = cmdq_pkt_append_command(pkt, inst);
>> if (err < 0)
>> return err;
>>
>> @@ -166,45 +186,50 @@ EXPORT_SYMBOL(cmdq_pkt_write_mask);
>>
>> int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
>> {
>> - u32 arg_b;
>> + struct cmdq_instruction inst = { {0} };
>>
>> if (event >= CMDQ_MAX_EVENT)
>> return -EINVAL;
>>
>> - /*
>> - * WFE arg_b
>> - * bit 0-11: wait value
>> - * bit 15: 1 - wait, 0 - no wait
>> - * bit 16-27: update value
>> - * bit 31: 1 - update, 0 - no update
>> - */
>> - arg_b = CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | CMDQ_WFE_WAIT_VALUE;
>> + inst.op = CMDQ_CODE_WFE;
>> + inst.value = CMDQ_WFE_OPTION;
>> + inst.event = event;
>>
>> - return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event, arg_b);
>> + return cmdq_pkt_append_command(pkt, inst);
>> }
>> EXPORT_SYMBOL(cmdq_pkt_wfe);
>>
>> int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
>> {
>> + struct cmdq_instruction inst = { {0} };
>> +
>> if (event >= CMDQ_MAX_EVENT)
>> return -EINVAL;
>>
>> - return cmdq_pkt_append_command(pkt, CMDQ_CODE_WFE, event,
>> - CMDQ_WFE_UPDATE);
>> + inst.op = CMDQ_CODE_WFE;
>> + inst.value = CMDQ_WFE_UPDATE;
>> + inst.event = event;
>> +
>> + return cmdq_pkt_append_command(pkt, inst);
>> }
>> EXPORT_SYMBOL(cmdq_pkt_clear_event);
>>
>> static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>> {
>> + struct cmdq_instruction inst = { {0} };
>> int err;
>>
>> /* insert EOC and generate IRQ for each command iteration */
>> - err = cmdq_pkt_append_command(pkt, CMDQ_CODE_EOC, 0, CMDQ_EOC_IRQ_EN);
>> + inst.op = CMDQ_CODE_EOC;
>> + inst.value = CMDQ_EOC_IRQ_EN;
>> + err = cmdq_pkt_append_command(pkt, inst);
>> if (err < 0)
>> return err;
>>
>> /* JUMP to end */
>> - err = cmdq_pkt_append_command(pkt, CMDQ_CODE_JUMP, 0, CMDQ_JUMP_PASS);
>> + inst.op = CMDQ_CODE_JUMP;
>> + inst.value = CMDQ_JUMP_PASS;
>> + err = cmdq_pkt_append_command(pkt, inst);
>>
>> return err;
>> }
>> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
>> index e6f54ef6698b..678760548791 100644
>> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
>> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
>> @@ -20,6 +20,16 @@
>> #define CMDQ_WFE_WAIT BIT(15)
>> #define CMDQ_WFE_WAIT_VALUE 0x1
>>
>> +/*
>> + * WFE arg_b
>> + * bit 0-11: wait value
>> + * bit 15: 1 - wait, 0 - no wait
>> + * bit 16-27: update value
>> + * bit 31: 1 - update, 0 - no update
>> + */
>> +#define CMDQ_WFE_OPTION (CMDQ_WFE_UPDATE | CMDQ_WFE_WAIT | \
>> + CMDQ_WFE_WAIT_VALUE)
>> +
>> /** cmdq event maximum */
>> #define CMDQ_MAX_EVENT 0x3ff
>>
>
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