ath11k: Add support for targets without trustzone

Add the support to attach WCN6750 and map iommu domain
for targets which do not have the support of TrustZone.

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00573-QCAMSLSWPLZ-1
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.5.0.1-01100-QCAHKSWPL_SILICONZ-1
Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-00192-QCAHKSWPL_SILICONZ-1

Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220328062032.28881-1-quic_mpubbise@quicinc.com

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index 050bda8..fa11807 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -9,6 +9,8 @@
 #include <linux/of_device.h>
 #include <linux/of.h>
 #include <linux/dma-mapping.h>
+#include <linux/of_address.h>
+#include <linux/iommu.h>
 #include "ahb.h"
 #include "debug.h"
 #include "hif.h"
@@ -757,6 +759,172 @@ static int ath11k_ahb_setup_resources(struct ath11k_base *ab)
        return 0;
 }
 
+static int ath11k_ahb_setup_msa_resources(struct ath11k_base *ab)
+{
+       struct ath11k_ahb *ab_ahb = ath11k_ahb_priv(ab);
+       struct device *dev = ab->dev;
+       struct device_node *node;
+       struct resource r;
+       int ret;
+
+       node = of_parse_phandle(dev->of_node, "memory-region", 0);
+       if (!node)
+               return -ENOENT;
+
+       ret = of_address_to_resource(node, 0, &r);
+       of_node_put(node);
+       if (ret) {
+               dev_err(dev, "failed to resolve msa fixed region\n");
+               return ret;
+       }
+
+       ab_ahb->fw.msa_paddr = r.start;
+       ab_ahb->fw.msa_size = resource_size(&r);
+
+       node = of_parse_phandle(dev->of_node, "memory-region", 1);
+       if (!node)
+               return -ENOENT;
+
+       ret = of_address_to_resource(node, 0, &r);
+       of_node_put(node);
+       if (ret) {
+               dev_err(dev, "failed to resolve ce fixed region\n");
+               return ret;
+       }
+
+       ab_ahb->fw.ce_paddr = r.start;
+       ab_ahb->fw.ce_size = resource_size(&r);
+
+       return 0;
+}
+
+static int ath11k_ahb_fw_resources_init(struct ath11k_base *ab)
+{
+       struct ath11k_ahb *ab_ahb = ath11k_ahb_priv(ab);
+       struct device *host_dev = ab->dev;
+       struct platform_device_info info = {0};
+       struct iommu_domain *iommu_dom;
+       struct platform_device *pdev;
+       struct device_node *node;
+       int ret;
+
+       /* Chipsets not requiring MSA need not initialize
+        * MSA resources, return success in such cases.
+        */
+       if (!ab->hw_params.fixed_fw_mem)
+               return 0;
+
+       ret = ath11k_ahb_setup_msa_resources(ab);
+       if (ret) {
+               ath11k_err(ab, "failed to setup msa resources\n");
+               return ret;
+       }
+
+       node = of_get_child_by_name(host_dev->of_node, "wifi-firmware");
+       if (!node) {
+               ab_ahb->fw.use_tz = true;
+               return 0;
+       }
+
+       info.fwnode = &node->fwnode;
+       info.parent = host_dev;
+       info.name = node->name;
+       info.dma_mask = DMA_BIT_MASK(32);
+
+       pdev = platform_device_register_full(&info);
+       if (IS_ERR(pdev)) {
+               of_node_put(node);
+               return PTR_ERR(pdev);
+       }
+
+       ret = of_dma_configure(&pdev->dev, node, true);
+       if (ret) {
+               ath11k_err(ab, "dma configure fail: %d\n", ret);
+               goto err_unregister;
+       }
+
+       ab_ahb->fw.dev = &pdev->dev;
+
+       iommu_dom = iommu_domain_alloc(&platform_bus_type);
+       if (!iommu_dom) {
+               ath11k_err(ab, "failed to allocate iommu domain\n");
+               ret = -ENOMEM;
+               goto err_unregister;
+       }
+
+       ret = iommu_attach_device(iommu_dom, ab_ahb->fw.dev);
+       if (ret) {
+               ath11k_err(ab, "could not attach device: %d\n", ret);
+               goto err_iommu_free;
+       }
+
+       ret = iommu_map(iommu_dom, ab_ahb->fw.msa_paddr,
+                       ab_ahb->fw.msa_paddr, ab_ahb->fw.msa_size,
+                       IOMMU_READ | IOMMU_WRITE);
+       if (ret) {
+               ath11k_err(ab, "failed to map firmware region: %d\n", ret);
+               goto err_iommu_detach;
+       }
+
+       ret = iommu_map(iommu_dom, ab_ahb->fw.ce_paddr,
+                       ab_ahb->fw.ce_paddr, ab_ahb->fw.ce_size,
+                       IOMMU_READ | IOMMU_WRITE);
+       if (ret) {
+               ath11k_err(ab, "failed to map firmware CE region: %d\n", ret);
+               goto err_iommu_unmap;
+       }
+
+       ab_ahb->fw.use_tz = false;
+       ab_ahb->fw.iommu_domain = iommu_dom;
+       of_node_put(node);
+
+       return 0;
+
+err_iommu_unmap:
+       iommu_unmap(iommu_dom, ab_ahb->fw.msa_paddr, ab_ahb->fw.msa_size);
+
+err_iommu_detach:
+       iommu_detach_device(iommu_dom, ab_ahb->fw.dev);
+
+err_iommu_free:
+       iommu_domain_free(iommu_dom);
+
+err_unregister:
+       platform_device_unregister(pdev);
+       of_node_put(node);
+
+       return ret;
+}
+
+static int ath11k_ahb_fw_resource_deinit(struct ath11k_base *ab)
+{
+       struct ath11k_ahb *ab_ahb = ath11k_ahb_priv(ab);
+       struct iommu_domain *iommu;
+       size_t unmapped_size;
+
+       if (ab_ahb->fw.use_tz)
+               return 0;
+
+       iommu = ab_ahb->fw.iommu_domain;
+
+       unmapped_size = iommu_unmap(iommu, ab_ahb->fw.msa_paddr, ab_ahb->fw.msa_size);
+       if (unmapped_size != ab_ahb->fw.msa_size)
+               ath11k_err(ab, "failed to unmap firmware: %zu\n",
+                          unmapped_size);
+
+       unmapped_size = iommu_unmap(iommu, ab_ahb->fw.ce_paddr, ab_ahb->fw.ce_size);
+       if (unmapped_size != ab_ahb->fw.ce_size)
+               ath11k_err(ab, "failed to unmap firmware CE memory: %zu\n",
+                          unmapped_size);
+
+       iommu_detach_device(iommu, ab_ahb->fw.dev);
+       iommu_domain_free(iommu);
+
+       platform_device_unregister(to_platform_device(ab_ahb->fw.dev));
+
+       return 0;
+}
+
 static int ath11k_ahb_probe(struct platform_device *pdev)
 {
        struct ath11k_base *ab;
@@ -816,10 +984,14 @@ static int ath11k_ahb_probe(struct platform_device *pdev)
        if (ret)
                goto err_core_free;
 
-       ret = ath11k_hal_srng_init(ab);
+       ret = ath11k_ahb_fw_resources_init(ab);
        if (ret)
                goto err_core_free;
 
+       ret = ath11k_hal_srng_init(ab);
+       if (ret)
+               goto err_fw_deinit;
+
        ret = ath11k_ce_alloc_pipes(ab);
        if (ret) {
                ath11k_err(ab, "failed to allocate ce pipes: %d\n", ret);
@@ -856,6 +1028,9 @@ err_ce_free:
 err_hal_srng_deinit:
        ath11k_hal_srng_deinit(ab);
 
+err_fw_deinit:
+       ath11k_ahb_fw_resource_deinit(ab);
+
 err_core_free:
        ath11k_core_free(ab);
        platform_set_drvdata(pdev, NULL);
@@ -891,6 +1066,7 @@ static int ath11k_ahb_remove(struct platform_device *pdev)
 qmi_fail:
        ath11k_ahb_free_irq(ab);
        ath11k_hal_srng_deinit(ab);
+       ath11k_ahb_fw_resource_deinit(ab);
        ath11k_ce_free_pipes(ab);
        ath11k_core_free(ab);
        platform_set_drvdata(pdev, NULL);

diff --git a/drivers/net/wireless/ath/ath11k/ahb.h b/drivers/net/wireless/ath/ath11k/ahb.h
index 51e6e4a..58a9454 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/ahb.h
+++ b/drivers/net/wireless/ath/ath11k/ahb.h
@@ -12,6 +12,15 @@ struct ath11k_base;
 
 struct ath11k_ahb {
        struct rproc *tgt_rproc;
+       struct {
+               struct device *dev;
+               struct iommu_domain *iommu_domain;
+               dma_addr_t msa_paddr;
+               u32 msa_size;
+               dma_addr_t ce_paddr;
+               u32 ce_size;
+               bool use_tz;
+       } fw;
 };
 
 static inline struct ath11k_ahb *ath11k_ahb_priv(struct ath11k_base *ab)