diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ipa/gsi.c | 114 |
1 files changed, 66 insertions, 48 deletions
diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c index a2fcdb1abdb9..bc981043cc80 100644 --- a/drivers/net/ipa/gsi.c +++ b/drivers/net/ipa/gsi.c @@ -93,6 +93,7 @@ #define GSI_CHANNEL_STOP_RETRIES 10 #define GSI_CHANNEL_MODEM_HALT_RETRIES 10 +#define GSI_CHANNEL_MODEM_FLOW_RETRIES 5 /* disable flow control only */ #define GSI_MHI_EVENT_ID_START 10 /* 1st reserved event id */ #define GSI_MHI_EVENT_ID_END 16 /* Last reserved event id */ @@ -339,10 +340,10 @@ static u32 gsi_ring_index(struct gsi_ring *ring, u32 offset) * completion to be signaled. Returns true if the command completes * or false if it times out. */ -static bool -gsi_command(struct gsi *gsi, u32 reg, u32 val, struct completion *completion) +static bool gsi_command(struct gsi *gsi, u32 reg, u32 val) { unsigned long timeout = msecs_to_jiffies(GSI_CMD_TIMEOUT); + struct completion *completion = &gsi->completion; reinit_completion(completion); @@ -366,8 +367,6 @@ gsi_evt_ring_state(struct gsi *gsi, u32 evt_ring_id) static void gsi_evt_ring_command(struct gsi *gsi, u32 evt_ring_id, enum gsi_evt_cmd_opcode opcode) { - struct gsi_evt_ring *evt_ring = &gsi->evt_ring[evt_ring_id]; - struct completion *completion = &evt_ring->completion; struct device *dev = gsi->dev; bool timeout; u32 val; @@ -378,7 +377,7 @@ static void gsi_evt_ring_command(struct gsi *gsi, u32 evt_ring_id, val = u32_encode_bits(evt_ring_id, EV_CHID_FMASK); val |= u32_encode_bits(opcode, EV_OPCODE_FMASK); - timeout = !gsi_command(gsi, GSI_EV_CH_CMD_OFFSET, val, completion); + timeout = !gsi_command(gsi, GSI_EV_CH_CMD_OFFSET, val); gsi_irq_ev_ctrl_disable(gsi); @@ -478,7 +477,6 @@ static enum gsi_channel_state gsi_channel_state(struct gsi_channel *channel) static void gsi_channel_command(struct gsi_channel *channel, enum gsi_ch_cmd_opcode opcode) { - struct completion *completion = &channel->completion; u32 channel_id = gsi_channel_id(channel); struct gsi *gsi = channel->gsi; struct device *dev = gsi->dev; @@ -490,7 +488,7 @@ gsi_channel_command(struct gsi_channel *channel, enum gsi_ch_cmd_opcode opcode) val = u32_encode_bits(channel_id, CH_CHID_FMASK); val |= u32_encode_bits(opcode, CH_OPCODE_FMASK); - timeout = !gsi_command(gsi, GSI_CH_CMD_OFFSET, val, completion); + timeout = !gsi_command(gsi, GSI_CH_CMD_OFFSET, val); gsi_irq_ch_ctrl_disable(gsi); @@ -1074,13 +1072,10 @@ static void gsi_isr_chan_ctrl(struct gsi *gsi) while (channel_mask) { u32 channel_id = __ffs(channel_mask); - struct gsi_channel *channel; channel_mask ^= BIT(channel_id); - channel = &gsi->channel[channel_id]; - - complete(&channel->completion); + complete(&gsi->completion); } } @@ -1094,13 +1089,10 @@ static void gsi_isr_evt_ctrl(struct gsi *gsi) while (event_mask) { u32 evt_ring_id = __ffs(event_mask); - struct gsi_evt_ring *evt_ring; event_mask ^= BIT(evt_ring_id); - evt_ring = &gsi->evt_ring[evt_ring_id]; - - complete(&evt_ring->completion); + complete(&gsi->completion); } } @@ -1110,7 +1102,7 @@ gsi_isr_glob_chan_err(struct gsi *gsi, u32 err_ee, u32 channel_id, u32 code) { if (code == GSI_OUT_OF_RESOURCES) { dev_err(gsi->dev, "channel %u out of resources\n", channel_id); - complete(&gsi->channel[channel_id].completion); + complete(&gsi->completion); return; } @@ -1127,7 +1119,7 @@ gsi_isr_glob_evt_err(struct gsi *gsi, u32 err_ee, u32 evt_ring_id, u32 code) struct gsi_evt_ring *evt_ring = &gsi->evt_ring[evt_ring_id]; u32 channel_id = gsi_channel_id(evt_ring->channel); - complete(&evt_ring->completion); + complete(&gsi->completion); dev_err(gsi->dev, "evt_ring for channel %u out of resources\n", channel_id); return; @@ -1171,18 +1163,23 @@ static void gsi_isr_gp_int1(struct gsi *gsi) u32 result; u32 val; - /* This interrupt is used to handle completions of the two GENERIC - * GSI commands. We use these to allocate and halt channels on - * the modem's behalf due to a hardware quirk on IPA v4.2. Once - * allocated, the modem "owns" these channels, and as a result we - * have no way of knowing the channel's state at any given time. + /* This interrupt is used to handle completions of GENERIC GSI + * commands. We use these to allocate and halt channels on the + * modem's behalf due to a hardware quirk on IPA v4.2. The modem + * "owns" channels even when the AP allocates them, and have no + * way of knowing whether a modem channel's state has been changed. + * + * We also use GENERIC commands to enable/disable channel flow + * control for IPA v4.2+. * * It is recommended that we halt the modem channels we allocated * when shutting down, but it's possible the channel isn't running * at the time we issue the HALT command. We'll get an error in * that case, but it's harmless (the channel is already halted). + * Similarly, we could get an error back when updating flow control + * on a channel because it's not in the proper state. * - * For this reason, we silently ignore a CHANNEL_NOT_RUNNING error + * In either case, we silently ignore a CHANNEL_NOT_RUNNING error * if we receive it. */ val = ioread32(gsi->virt + GSI_CNTXT_SCRATCH_0_OFFSET); @@ -1648,19 +1645,25 @@ static void gsi_channel_teardown_one(struct gsi *gsi, u32 channel_id) gsi_evt_ring_de_alloc_command(gsi, evt_ring_id); } +/* We use generic commands only to operate on modem channels. We don't have + * the ability to determine channel state for a modem channel, so we simply + * issue the command and wait for it to complete. + */ static int gsi_generic_command(struct gsi *gsi, u32 channel_id, - enum gsi_generic_cmd_opcode opcode) + enum gsi_generic_cmd_opcode opcode, + u8 params) { - struct completion *completion = &gsi->completion; bool timeout; u32 val; - /* The error global interrupt type is always enabled (until we - * teardown), so we won't change that. A generic EE command - * completes with a GSI global interrupt of type GP_INT1. We - * only perform one generic command at a time (to allocate or - * halt a modem channel) and only from this function. So we - * enable the GP_INT1 IRQ type here while we're expecting it. + /* The error global interrupt type is always enabled (until we tear + * down), so we will keep it enabled. + * + * A generic EE command completes with a GSI global interrupt of + * type GP_INT1. We only perform one generic command at a time + * (to allocate, halt, or enable/disable flow control on a modem + * channel), and only from this function. So we enable the GP_INT1 + * IRQ type here, and disable it again after the command completes. */ val = BIT(ERROR_INT) | BIT(GP_INT1); iowrite32(val, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET); @@ -1674,8 +1677,9 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id, val = u32_encode_bits(opcode, GENERIC_OPCODE_FMASK); val |= u32_encode_bits(channel_id, GENERIC_CHID_FMASK); val |= u32_encode_bits(GSI_EE_MODEM, GENERIC_EE_FMASK); + val |= u32_encode_bits(params, GENERIC_PARAMS_FMASK); - timeout = !gsi_command(gsi, GSI_GENERIC_CMD_OFFSET, val, completion); + timeout = !gsi_command(gsi, GSI_GENERIC_CMD_OFFSET, val); /* Disable the GP_INT1 IRQ type again */ iowrite32(BIT(ERROR_INT), gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET); @@ -1692,7 +1696,7 @@ static int gsi_generic_command(struct gsi *gsi, u32 channel_id, static int gsi_modem_channel_alloc(struct gsi *gsi, u32 channel_id) { return gsi_generic_command(gsi, channel_id, - GSI_GENERIC_ALLOCATE_CHANNEL); + GSI_GENERIC_ALLOCATE_CHANNEL, 0); } static void gsi_modem_channel_halt(struct gsi *gsi, u32 channel_id) @@ -1702,7 +1706,7 @@ static void gsi_modem_channel_halt(struct gsi *gsi, u32 channel_id) do ret = gsi_generic_command(gsi, channel_id, - GSI_GENERIC_HALT_CHANNEL); + GSI_GENERIC_HALT_CHANNEL, 0); while (ret == -EAGAIN && retries--); if (ret) @@ -1710,6 +1714,32 @@ static void gsi_modem_channel_halt(struct gsi *gsi, u32 channel_id) ret, channel_id); } +/* Enable or disable flow control for a modem GSI TX channel (IPA v4.2+) */ +void +gsi_modem_channel_flow_control(struct gsi *gsi, u32 channel_id, bool enable) +{ + u32 retries = 0; + u32 command; + int ret; + + command = enable ? GSI_GENERIC_ENABLE_FLOW_CONTROL + : GSI_GENERIC_DISABLE_FLOW_CONTROL; + /* Disabling flow control on IPA v4.11+ can return -EAGAIN if enable + * is underway. In this case we need to retry the command. + */ + if (!enable && gsi->version >= IPA_VERSION_4_11) + retries = GSI_CHANNEL_MODEM_FLOW_RETRIES; + + do + ret = gsi_generic_command(gsi, channel_id, command, 0); + while (ret == -EAGAIN && retries--); + + if (ret) + dev_err(gsi->dev, + "error %d %sabling mode channel %u flow control\n", + ret, enable ? "en" : "dis", channel_id); +} + /* Setup function for channels */ static int gsi_channel_setup(struct gsi *gsi) { @@ -1975,18 +2005,6 @@ static void gsi_channel_evt_ring_exit(struct gsi_channel *channel) gsi_evt_ring_id_free(gsi, evt_ring_id); } -/* Init function for event rings; there is no gsi_evt_ring_exit() */ -static void gsi_evt_ring_init(struct gsi *gsi) -{ - u32 evt_ring_id = 0; - - gsi->event_bitmap = gsi_event_bitmap_init(GSI_EVT_RING_COUNT_MAX); - gsi->ieob_enabled_bitmap = 0; - do - init_completion(&gsi->evt_ring[evt_ring_id].completion); - while (++evt_ring_id < GSI_EVT_RING_COUNT_MAX); -} - static bool gsi_channel_data_valid(struct gsi *gsi, const struct ipa_gsi_endpoint_data *data) { @@ -2069,7 +2087,6 @@ static int gsi_channel_init_one(struct gsi *gsi, channel->tlv_count = data->channel.tlv_count; channel->tre_count = tre_count; channel->event_count = data->channel.event_count; - init_completion(&channel->completion); ret = gsi_channel_evt_ring_init(channel); if (ret) @@ -2129,7 +2146,8 @@ static int gsi_channel_init(struct gsi *gsi, u32 count, /* IPA v4.2 requires the AP to allocate channels for the modem */ modem_alloc = gsi->version == IPA_VERSION_4_2; - gsi_evt_ring_init(gsi); /* No matching exit required */ + gsi->event_bitmap = gsi_event_bitmap_init(GSI_EVT_RING_COUNT_MAX); + gsi->ieob_enabled_bitmap = 0; /* The endpoint data array is indexed by endpoint name */ for (i = 0; i < count; i++) { |