[PATCH 33/50] wifi: ath12k: add mhi.c

Kalle Valo
2022-08-12T16:09:46Z

From: Kalle Valo <quic_kvalo@quicinc.com>

(Patches split into one patch per file for easier review, but the final
commit will be one big patch. See the cover letter for more info.)

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
---
drivers/net/wireless/ath/ath12k/mhi.c | 615 ++++++++++++++++++++++++++++++++++
1 file changed, 615 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/mhi.c b/drivers/net/wireless/ath/ath12k/mhi.c
new file mode 100644
index 000000000000..f77634994d97
--- /dev/null
+++ b/drivers/net/wireless/ath/ath12k/mhi.c
@@ -0,0 +1,615 @@
+// SPDX-License-Identifier: BSD-3-Clause-Clear
+/*
+ * Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/msi.h>
+#include <linux/pci.h>
+
+#include "core.h"
+#include "debug.h"
+#include "mhi.h"
+#include "pci.h"
+
+#define MHI_TIMEOUT_DEFAULT_MS 90000
+
+static struct mhi_channel_config ath12k_mhi_channels_qcn9274[] = {
+ {
+ .num = 0,
+ .name = "LOOPBACK",
+ .num_elements = 32,
+ .event_ring = 1,
+ .dir = DMA_TO_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ },
+ {
+ .num = 1,
+ .name = "LOOPBACK",
+ .num_elements = 32,
+ .event_ring = 1,
+ .dir = DMA_FROM_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ },
+ {
+ .num = 20,
+ .name = "IPCR",
+ .num_elements = 32,
+ .event_ring = 1,
+ .dir = DMA_TO_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ },
+ {
+ .num = 21,
+ .name = "IPCR",
+ .num_elements = 32,
+ .event_ring = 1,
+ .dir = DMA_FROM_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = true,
+ },
+};
+
+static struct mhi_event_config ath12k_mhi_events_qcn9274[] = {
+ {
+ .num_elements = 32,
+ .irq_moderation_ms = 0,
+ .irq = 1,
+ .data_type = MHI_ER_CTRL,
+ .mode = MHI_DB_BRST_DISABLE,
+ .hardware_event = false,
+ .client_managed = false,
+ .offload_channel = false,
+ },
+ {
+ .num_elements = 256,
+ .irq_moderation_ms = 1,
+ .irq = 2,
+ .mode = MHI_DB_BRST_DISABLE,
+ .priority = 1,
+ .hardware_event = false,
+ .client_managed = false,
+ .offload_channel = false,
+ },
+};
+
+struct mhi_controller_config ath12k_mhi_config_qcn9274 = {
+ .max_channels = 30,
+ .timeout_ms = 10000,
+ .use_bounce_buf = false,
+ .buf_len = 0,
+ .num_channels = ARRAY_SIZE(ath12k_mhi_channels_qcn9274),
+ .ch_cfg = ath12k_mhi_channels_qcn9274,
+ .num_events = ARRAY_SIZE(ath12k_mhi_events_qcn9274),
+ .event_cfg = ath12k_mhi_events_qcn9274,
+};
+
+static struct mhi_channel_config ath12k_mhi_channels_wcn7850[] = {
+ {
+ .num = 0,
+ .name = "LOOPBACK",
+ .num_elements = 32,
+ .event_ring = 0,
+ .dir = DMA_TO_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ },
+ {
+ .num = 1,
+ .name = "LOOPBACK",
+ .num_elements = 32,
+ .event_ring = 0,
+ .dir = DMA_FROM_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ },
+ {
+ .num = 20,
+ .name = "IPCR",
+ .num_elements = 64,
+ .event_ring = 1,
+ .dir = DMA_TO_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = false,
+ },
+ {
+ .num = 21,
+ .name = "IPCR",
+ .num_elements = 64,
+ .event_ring = 1,
+ .dir = DMA_FROM_DEVICE,
+ .ee_mask = 0x4,
+ .pollcfg = 0,
+ .doorbell = MHI_DB_BRST_DISABLE,
+ .lpm_notify = false,
+ .offload_channel = false,
+ .doorbell_mode_switch = false,
+ .auto_queue = true,
+ },
+};
+
+static struct mhi_event_config ath12k_mhi_events_wcn7850[] = {
+ {
+ .num_elements = 32,
+ .irq_moderation_ms = 0,
+ .irq = 1,
+ .mode = MHI_DB_BRST_DISABLE,
+ .data_type = MHI_ER_CTRL,
+ .hardware_event = false,
+ .client_managed = false,
+ .offload_channel = false,
+ },
+ {
+ .num_elements = 256,
+ .irq_moderation_ms = 1,
+ .irq = 2,
+ .mode = MHI_DB_BRST_DISABLE,
+ .priority = 1,
+ .hardware_event = false,
+ .client_managed = false,
+ .offload_channel = false,
+ },
+};
+
+struct mhi_controller_config ath12k_mhi_config_wcn7850 = {
+ .max_channels = 128,
+ .timeout_ms = 2000,
+ .use_bounce_buf = false,
+ .buf_len = 0,
+ .num_channels = ARRAY_SIZE(ath12k_mhi_channels_wcn7850),
+ .ch_cfg = ath12k_mhi_channels_wcn7850,
+ .num_events = ARRAY_SIZE(ath12k_mhi_events_wcn7850),
+ .event_cfg = ath12k_mhi_events_wcn7850,
+};
+
+void ath12k_mhi_set_mhictrl_reset(struct ath12k_base *ab)
+{
+ u32 val;
+
+ val = ath12k_pci_read32(ab, MHISTATUS);
+
+ ath12k_dbg(ab, ATH12K_DBG_PCI, "MHISTATUS 0x%x\n", val);
+
+ /* Observed on some targets that after SOC_GLOBAL_RESET, MHISTATUS
+ * has SYSERR bit set and thus need to set MHICTRL_RESET
+ * to clear SYSERR.
+ */
+ ath12k_pci_write32(ab, MHICTRL, MHICTRL_RESET_MASK);
+
+ mdelay(10);
+}
+
+static void ath12k_mhi_reset_txvecdb(struct ath12k_base *ab)
+{
+ ath12k_pci_write32(ab, PCIE_TXVECDB, 0);
+}
+
+static void ath12k_mhi_reset_txvecstatus(struct ath12k_base *ab)
+{
+ ath12k_pci_write32(ab, PCIE_TXVECSTATUS, 0);
+}
+
+static void ath12k_mhi_reset_rxvecdb(struct ath12k_base *ab)
+{
+ ath12k_pci_write32(ab, PCIE_RXVECDB, 0);
+}
+
+static void ath12k_mhi_reset_rxvecstatus(struct ath12k_base *ab)
+{
+ ath12k_pci_write32(ab, PCIE_RXVECSTATUS, 0);
+}
+
+void ath12k_mhi_clear_vector(struct ath12k_base *ab)
+{
+ ath12k_mhi_reset_txvecdb(ab);
+ ath12k_mhi_reset_txvecstatus(ab);
+ ath12k_mhi_reset_rxvecdb(ab);
+ ath12k_mhi_reset_rxvecstatus(ab);
+}
+
+static int ath12k_mhi_get_msi(struct ath12k_pci *ab_pci)
+{
+ struct ath12k_base *ab = ab_pci->ab;
+ u32 user_base_data, base_vector;
+ int ret, num_vectors, i;
+ int *irq;
+
+ ret = ath12k_pci_get_user_msi_assignment(ab,
+ "MHI", &num_vectors,
+ &user_base_data, &base_vector);
+ if (ret)
+ return ret;
+
+ ath12k_dbg(ab, ATH12K_DBG_PCI, "Number of assigned MSI for MHI is %d, base vector is %d\n",
+ num_vectors, base_vector);
+
+ irq = kcalloc(num_vectors, sizeof(int), GFP_KERNEL);
+ if (!irq)
+ return -ENOMEM;
+
+ for (i = 0; i < num_vectors; i++)
+ irq[i] = ath12k_pci_get_msi_irq(ab->dev,
+ base_vector + i);
+
+ ab_pci->mhi_ctrl->irq = irq;
+ ab_pci->mhi_ctrl->nr_irqs = num_vectors;
+
+ return 0;
+}
+
+static int ath12k_mhi_op_runtime_get(struct mhi_controller *mhi_cntrl)
+{
+ return 0;
+}
+
+static void ath12k_mhi_op_runtime_put(struct mhi_controller *mhi_cntrl)
+{
+}
+
+static char *ath12k_mhi_op_callback_to_str(enum mhi_callback reason)
+{
+ switch (reason) {
+ case MHI_CB_IDLE:
+ return "MHI_CB_IDLE";
+ case MHI_CB_PENDING_DATA:
+ return "MHI_CB_PENDING_DATA";
+ case MHI_CB_LPM_ENTER:
+ return "MHI_CB_LPM_ENTER";
+ case MHI_CB_LPM_EXIT:
+ return "MHI_CB_LPM_EXIT";
+ case MHI_CB_EE_RDDM:
+ return "MHI_CB_EE_RDDM";
+ case MHI_CB_EE_MISSION_MODE:
+ return "MHI_CB_EE_MISSION_MODE";
+ case MHI_CB_SYS_ERROR:
+ return "MHI_CB_SYS_ERROR";
+ case MHI_CB_FATAL_ERROR:
+ return "MHI_CB_FATAL_ERROR";
+ case MHI_CB_BW_REQ:
+ return "MHI_CB_BW_REQ";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+static void ath12k_mhi_op_status_cb(struct mhi_controller *mhi_cntrl,
+ enum mhi_callback cb)
+{
+ struct ath12k_base *ab = dev_get_drvdata(mhi_cntrl->cntrl_dev);
+
+ ath12k_dbg(ab, ATH12K_DBG_BOOT, "mhi notify status reason %s\n",
+ ath12k_mhi_op_callback_to_str(cb));
+
+ switch (cb) {
+ case MHI_CB_SYS_ERROR:
+ ath12k_warn(ab, "firmware crashed: MHI_CB_SYS_ERROR\n");
+ break;
+ case MHI_CB_EE_RDDM:
+ if (!(test_bit(ATH12K_FLAG_UNREGISTERING, &ab->dev_flags)))
+ queue_work(ab->workqueue_aux, &ab->reset_work);
+ break;
+ default:
+ break;
+ }
+}
+
+static int ath12k_mhi_op_read_reg(struct mhi_controller *mhi_cntrl,
+ void __iomem *addr,
+ u32 *out)
+{
+ *out = readl(addr);
+
+ return 0;
+}
+
+static void ath12k_mhi_op_write_reg(struct mhi_controller *mhi_cntrl,
+ void __iomem *addr,
+ u32 val)
+{
+ writel(val, addr);
+}
+
+int ath12k_mhi_register(struct ath12k_pci *ab_pci)
+{
+ struct ath12k_base *ab = ab_pci->ab;
+ struct mhi_controller *mhi_ctrl;
+ int ret;
+
+ mhi_ctrl = mhi_alloc_controller();
+ if (!mhi_ctrl)
+ return -ENOMEM;
+
+ ath12k_core_create_firmware_path(ab, ATH12K_AMSS_FILE,
+ ab_pci->amss_path,
+ sizeof(ab_pci->amss_path));
+
+ ab_pci->mhi_ctrl = mhi_ctrl;
+ mhi_ctrl->cntrl_dev = ab->dev;
+ mhi_ctrl->fw_image = ab_pci->amss_path;
+ mhi_ctrl->regs = ab->mem;
+ mhi_ctrl->reg_len = ab->mem_len;
+
+ ret = ath12k_mhi_get_msi(ab_pci);
+ if (ret) {
+ ath12k_err(ab, "failed to get msi for mhi\n");
+ mhi_free_controller(mhi_ctrl);
+ return ret;
+ }
+
+ mhi_ctrl->iova_start = 0;
+ mhi_ctrl->iova_stop = 0xffffffff;
+ mhi_ctrl->sbl_size = SZ_512K;
+ mhi_ctrl->seg_len = SZ_512K;
+ mhi_ctrl->fbc_download = true;
+ mhi_ctrl->runtime_get = ath12k_mhi_op_runtime_get;
+ mhi_ctrl->runtime_put = ath12k_mhi_op_runtime_put;
+ mhi_ctrl->status_cb = ath12k_mhi_op_status_cb;
+ mhi_ctrl->read_reg = ath12k_mhi_op_read_reg;
+ mhi_ctrl->write_reg = ath12k_mhi_op_write_reg;
+
+ ret = mhi_register_controller(mhi_ctrl, ab->hw_params->mhi_config);
+ if (ret) {
+ ath12k_err(ab, "failed to register to mhi bus, err = %d\n", ret);
+ mhi_free_controller(mhi_ctrl);
+ return ret;
+ }
+
+ return 0;
+}
+
+void ath12k_mhi_unregister(struct ath12k_pci *ab_pci)
+{
+ struct mhi_controller *mhi_ctrl = ab_pci->mhi_ctrl;
+
+ mhi_unregister_controller(mhi_ctrl);
+ kfree(mhi_ctrl->irq);
+ mhi_free_controller(mhi_ctrl);
+}
+
+static char *ath12k_mhi_state_to_str(enum ath12k_mhi_state mhi_state)
+{
+ switch (mhi_state) {
+ case ATH12K_MHI_INIT:
+ return "INIT";
+ case ATH12K_MHI_DEINIT:
+ return "DEINIT";
+ case ATH12K_MHI_POWER_ON:
+ return "POWER_ON";
+ case ATH12K_MHI_POWER_OFF:
+ return "POWER_OFF";
+ case ATH12K_MHI_FORCE_POWER_OFF:
+ return "FORCE_POWER_OFF";
+ case ATH12K_MHI_SUSPEND:
+ return "SUSPEND";
+ case ATH12K_MHI_RESUME:
+ return "RESUME";
+ case ATH12K_MHI_TRIGGER_RDDM:
+ return "TRIGGER_RDDM";
+ case ATH12K_MHI_RDDM_DONE:
+ return "RDDM_DONE";
+ default:
+ return "UNKNOWN";
+ }
+};
+
+static void ath12k_mhi_set_state_bit(struct ath12k_pci *ab_pci,
+ enum ath12k_mhi_state mhi_state)
+{
+ struct ath12k_base *ab = ab_pci->ab;
+
+ switch (mhi_state) {
+ case ATH12K_MHI_INIT:
+ set_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_DEINIT:
+ clear_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_POWER_ON:
+ set_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_POWER_OFF:
+ case ATH12K_MHI_FORCE_POWER_OFF:
+ clear_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state);
+ clear_bit(ATH12K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state);
+ clear_bit(ATH12K_MHI_RDDM_DONE, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_SUSPEND:
+ set_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_RESUME:
+ clear_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_TRIGGER_RDDM:
+ set_bit(ATH12K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state);
+ break;
+ case ATH12K_MHI_RDDM_DONE:
+ set_bit(ATH12K_MHI_RDDM_DONE, &ab_pci->mhi_state);
+ break;
+ default:
+ ath12k_err(ab, "unhandled mhi state (%d)\n", mhi_state);
+ }
+}
+
+static int ath12k_mhi_check_state_bit(struct ath12k_pci *ab_pci,
+ enum ath12k_mhi_state mhi_state)
+{
+ struct ath12k_base *ab = ab_pci->ab;
+
+ switch (mhi_state) {
+ case ATH12K_MHI_INIT:
+ if (!test_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state))
+ return 0;
+ break;
+ case ATH12K_MHI_DEINIT:
+ case ATH12K_MHI_POWER_ON:
+ if (test_bit(ATH12K_MHI_INIT, &ab_pci->mhi_state) &&
+ !test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state))
+ return 0;
+ break;
+ case ATH12K_MHI_FORCE_POWER_OFF:
+ if (test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state))
+ return 0;
+ break;
+ case ATH12K_MHI_POWER_OFF:
+ case ATH12K_MHI_SUSPEND:
+ if (test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state) &&
+ !test_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state))
+ return 0;
+ break;
+ case ATH12K_MHI_RESUME:
+ if (test_bit(ATH12K_MHI_SUSPEND, &ab_pci->mhi_state))
+ return 0;
+ break;
+ case ATH12K_MHI_TRIGGER_RDDM:
+ if (test_bit(ATH12K_MHI_POWER_ON, &ab_pci->mhi_state) &&
+ !test_bit(ATH12K_MHI_TRIGGER_RDDM, &ab_pci->mhi_state))
+ return 0;
+ break;
+ case ATH12K_MHI_RDDM_DONE:
+ return 0;
+ default:
+ ath12k_err(ab, "unhandled mhi state: %s(%d)\n",
+ ath12k_mhi_state_to_str(mhi_state), mhi_state);
+ }
+
+ ath12k_err(ab, "failed to set mhi state %s(%d) in current mhi state (0x%lx)\n",
+ ath12k_mhi_state_to_str(mhi_state), mhi_state,
+ ab_pci->mhi_state);
+
+ return -EINVAL;
+}
+
+static int ath12k_mhi_set_state(struct ath12k_pci *ab_pci,
+ enum ath12k_mhi_state mhi_state)
+{
+ struct ath12k_base *ab = ab_pci->ab;
+ int ret;
+
+ ret = ath12k_mhi_check_state_bit(ab_pci, mhi_state);
+ if (ret)
+ goto out;
+
+ ath12k_dbg(ab, ATH12K_DBG_PCI, "setting mhi state: %s(%d)\n",
+ ath12k_mhi_state_to_str(mhi_state), mhi_state);
+
+ switch (mhi_state) {
+ case ATH12K_MHI_INIT:
+ ret = mhi_prepare_for_power_up(ab_pci->mhi_ctrl);
+ break;
+ case ATH12K_MHI_DEINIT:
+ mhi_unprepare_after_power_down(ab_pci->mhi_ctrl);
+ ret = 0;
+ break;
+ case ATH12K_MHI_POWER_ON:
+ ret = mhi_async_power_up(ab_pci->mhi_ctrl);
+ break;
+ case ATH12K_MHI_POWER_OFF:
+ mhi_power_down(ab_pci->mhi_ctrl, true);
+ ret = 0;
+ break;
+ case ATH12K_MHI_FORCE_POWER_OFF:
+ mhi_power_down(ab_pci->mhi_ctrl, false);
+ ret = 0;
+ break;
+ case ATH12K_MHI_SUSPEND:
+ ret = mhi_pm_suspend(ab_pci->mhi_ctrl);
+ break;
+ case ATH12K_MHI_RESUME:
+ ret = mhi_pm_resume(ab_pci->mhi_ctrl);
+ break;
+ case ATH12K_MHI_TRIGGER_RDDM:
+ ret = mhi_force_rddm_mode(ab_pci->mhi_ctrl);
+ break;
+ case ATH12K_MHI_RDDM_DONE:
+ break;
+ default:
+ ath12k_err(ab, "unhandled MHI state (%d)\n", mhi_state);
+ ret = -EINVAL;
+ }
+
+ if (ret)
+ goto out;
+
+ ath12k_mhi_set_state_bit(ab_pci, mhi_state);
+
+ return 0;
+
+out:
+ ath12k_err(ab, "failed to set mhi state: %s(%d)\n",
+ ath12k_mhi_state_to_str(mhi_state), mhi_state);
+ return ret;
+}
+
+int ath12k_mhi_start(struct ath12k_pci *ab_pci)
+{
+ int ret;
+
+ ab_pci->mhi_ctrl->timeout_ms = MHI_TIMEOUT_DEFAULT_MS;
+
+ ret = ath12k_mhi_set_state(ab_pci, ATH12K_MHI_INIT);
+ if (ret)
+ goto out;
+
+ ret = ath12k_mhi_set_state(ab_pci, ATH12K_MHI_POWER_ON);
+ if (ret)
+ goto out;
+
+ return 0;
+
+out:
+ return ret;
+}
+
+void ath12k_mhi_stop(struct ath12k_pci *ab_pci)
+{
+ ath12k_mhi_set_state(ab_pci, ATH12K_MHI_POWER_OFF);
+ ath12k_mhi_set_state(ab_pci, ATH12K_MHI_DEINIT);
+}
+
+void ath12k_mhi_suspend(struct ath12k_pci *ab_pci)
+{
+ ath12k_mhi_set_state(ab_pci, ATH12K_MHI_SUSPEND);
+}
+
+void ath12k_mhi_resume(struct ath12k_pci *ab_pci)
+{
+ ath12k_mhi_set_state(ab_pci, ATH12K_MHI_RESUME);
+}