diff options
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/common.h | 22 | ||||
| -rw-r--r-- | drivers/bus/mhi/ep/internal.h | 4 | ||||
| -rw-r--r-- | drivers/bus/mhi/ep/main.c | 89 |
3 files changed, 115 insertions, 0 deletions
diff --git a/drivers/bus/mhi/common.h b/drivers/bus/mhi/common.h index b4ef9acd3ce7..f794b9c8049e 100644 --- a/drivers/bus/mhi/common.h +++ b/drivers/bus/mhi/common.h @@ -165,6 +165,22 @@ #define MHI_TRE_GET_EV_LINKSPEED(tre) FIELD_GET(GENMASK(31, 24), (MHI_TRE_GET_DWORD(tre, 1))) #define MHI_TRE_GET_EV_LINKWIDTH(tre) FIELD_GET(GENMASK(7, 0), (MHI_TRE_GET_DWORD(tre, 0))) +/* State change event */ +#define MHI_SC_EV_PTR 0 +#define MHI_SC_EV_DWORD0(state) cpu_to_le32(FIELD_PREP(GENMASK(31, 24), state)) +#define MHI_SC_EV_DWORD1(type) cpu_to_le32(FIELD_PREP(GENMASK(23, 16), type)) + +/* EE event */ +#define MHI_EE_EV_PTR 0 +#define MHI_EE_EV_DWORD0(ee) cpu_to_le32(FIELD_PREP(GENMASK(31, 24), ee)) +#define MHI_EE_EV_DWORD1(type) cpu_to_le32(FIELD_PREP(GENMASK(23, 16), type)) + + +/* Command Completion event */ +#define MHI_CC_EV_PTR(ptr) cpu_to_le64(ptr) +#define MHI_CC_EV_DWORD0(code) cpu_to_le32(FIELD_PREP(GENMASK(31, 24), code)) +#define MHI_CC_EV_DWORD1(type) cpu_to_le32(FIELD_PREP(GENMASK(23, 16), type)) + /* Transfer descriptor macros */ #define MHI_TRE_DATA_PTR(ptr) cpu_to_le64(ptr) #define MHI_TRE_DATA_DWORD0(len) cpu_to_le32(FIELD_PREP(GENMASK(15, 0), len)) @@ -175,6 +191,12 @@ FIELD_PREP(BIT(9), ieot) | \ FIELD_PREP(BIT(8), ieob) | \ FIELD_PREP(BIT(0), chain)) +#define MHI_TRE_DATA_GET_PTR(tre) le64_to_cpu((tre)->ptr) +#define MHI_TRE_DATA_GET_LEN(tre) FIELD_GET(GENMASK(15, 0), MHI_TRE_GET_DWORD(tre, 0)) +#define MHI_TRE_DATA_GET_CHAIN(tre) (!!(FIELD_GET(BIT(0), MHI_TRE_GET_DWORD(tre, 1)))) +#define MHI_TRE_DATA_GET_IEOB(tre) (!!(FIELD_GET(BIT(8), MHI_TRE_GET_DWORD(tre, 1)))) +#define MHI_TRE_DATA_GET_IEOT(tre) (!!(FIELD_GET(BIT(9), MHI_TRE_GET_DWORD(tre, 1)))) +#define MHI_TRE_DATA_GET_BEI(tre) (!!(FIELD_GET(BIT(10), MHI_TRE_GET_DWORD(tre, 1)))) /* RSC transfer descriptor macros */ #define MHI_RSCTRE_DATA_PTR(ptr, len) cpu_to_le64(FIELD_PREP(GENMASK(64, 48), len) | ptr) diff --git a/drivers/bus/mhi/ep/internal.h b/drivers/bus/mhi/ep/internal.h index d16b87061ac6..e096d9cb2cb1 100644 --- a/drivers/bus/mhi/ep/internal.h +++ b/drivers/bus/mhi/ep/internal.h @@ -197,4 +197,8 @@ void mhi_ep_mmio_get_mhi_state(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_state *s void mhi_ep_mmio_init(struct mhi_ep_cntrl *mhi_cntrl); void mhi_ep_mmio_update_ner(struct mhi_ep_cntrl *mhi_cntrl); +/* MHI EP core functions */ +int mhi_ep_send_state_change_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_state state); +int mhi_ep_send_ee_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_ee_type exec_env); + #endif diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index 7dcc784f10d1..eca1f58ba5fb 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -18,6 +18,93 @@ static DEFINE_IDA(mhi_ep_cntrl_ida); +static int mhi_ep_send_event(struct mhi_ep_cntrl *mhi_cntrl, u32 ring_idx, + struct mhi_ring_element *el, bool bei) +{ + struct device *dev = &mhi_cntrl->mhi_dev->dev; + union mhi_ep_ring_ctx *ctx; + struct mhi_ep_ring *ring; + int ret; + + mutex_lock(&mhi_cntrl->event_lock); + ring = &mhi_cntrl->mhi_event[ring_idx].ring; + ctx = (union mhi_ep_ring_ctx *)&mhi_cntrl->ev_ctx_cache[ring_idx]; + if (!ring->started) { + ret = mhi_ep_ring_start(mhi_cntrl, ring, ctx); + if (ret) { + dev_err(dev, "Error starting event ring (%u)\n", ring_idx); + goto err_unlock; + } + } + + /* Add element to the event ring */ + ret = mhi_ep_ring_add_element(ring, el); + if (ret) { + dev_err(dev, "Error adding element to event ring (%u)\n", ring_idx); + goto err_unlock; + } + + mutex_unlock(&mhi_cntrl->event_lock); + + /* + * Raise IRQ to host only if the BEI flag is not set in TRE. Host might + * set this flag for interrupt moderation as per MHI protocol. + */ + if (!bei) + mhi_cntrl->raise_irq(mhi_cntrl, ring->irq_vector); + + return 0; + +err_unlock: + mutex_unlock(&mhi_cntrl->event_lock); + + return ret; +} + +static int mhi_ep_send_completion_event(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_ring *ring, + struct mhi_ring_element *tre, u32 len, enum mhi_ev_ccs code) +{ + struct mhi_ring_element event = {}; + + event.ptr = cpu_to_le64(ring->rbase + ring->rd_offset * sizeof(*tre)); + event.dword[0] = MHI_TRE_EV_DWORD0(code, len); + event.dword[1] = MHI_TRE_EV_DWORD1(ring->ch_id, MHI_PKT_TYPE_TX_EVENT); + + return mhi_ep_send_event(mhi_cntrl, ring->er_index, &event, MHI_TRE_DATA_GET_BEI(tre)); +} + +int mhi_ep_send_state_change_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_state state) +{ + struct mhi_ring_element event = {}; + + event.dword[0] = MHI_SC_EV_DWORD0(state); + event.dword[1] = MHI_SC_EV_DWORD1(MHI_PKT_TYPE_STATE_CHANGE_EVENT); + + return mhi_ep_send_event(mhi_cntrl, 0, &event, 0); +} + +int mhi_ep_send_ee_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_ee_type exec_env) +{ + struct mhi_ring_element event = {}; + + event.dword[0] = MHI_EE_EV_DWORD0(exec_env); + event.dword[1] = MHI_SC_EV_DWORD1(MHI_PKT_TYPE_EE_EVENT); + + return mhi_ep_send_event(mhi_cntrl, 0, &event, 0); +} + +static int mhi_ep_send_cmd_comp_event(struct mhi_ep_cntrl *mhi_cntrl, enum mhi_ev_ccs code) +{ + struct mhi_ep_ring *ring = &mhi_cntrl->mhi_cmd->ring; + struct mhi_ring_element event = {}; + + event.ptr = cpu_to_le64(ring->rbase + ring->rd_offset * sizeof(struct mhi_ring_element)); + event.dword[0] = MHI_CC_EV_DWORD0(code); + event.dword[1] = MHI_CC_EV_DWORD1(MHI_PKT_TYPE_CMD_COMPLETION_EVENT); + + return mhi_ep_send_event(mhi_cntrl, 0, &event, 0); +} + static void mhi_ep_release_device(struct device *dev) { struct mhi_ep_device *mhi_dev = to_mhi_ep_device(dev); @@ -227,6 +314,8 @@ int mhi_ep_register_controller(struct mhi_ep_cntrl *mhi_cntrl, goto err_free_ch; } + mutex_init(&mhi_cntrl->event_lock); + /* Set MHI version and AMSS EE before enumeration */ mhi_ep_mmio_write(mhi_cntrl, EP_MHIVER, config->mhi_version); mhi_ep_mmio_set_env(mhi_cntrl, MHI_EE_AMSS); |