ath11k: Use reserved host DDR addresses from DT for PCI devices

Host DDR memory (contiguous 45 MB in mode-0 or 15 MB in mode-2)
is reserved through DT entries for firmware usage. Send the base
address from DT entries.
If DT entry is available, PCI device will work with
fixed_mem_region else host allocates multiple segments.

IPQ8074 on HK10 board supports multiple PCI devices.
IPQ8074 + QCN9074 is tested with this patch.

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.4.0.1-01838-QCAHKSWPL_SILICONZ-1

Signed-off-by: Anilkumar Kolli <akolli@codeaurora.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1638789319-2950-2-git-send-email-akolli@codeaurora.org

1 files changed, 32 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index 9a8e61ca9964..38af8ec69d4c 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -3,6 +3,9 @@
 
 #include <linux/msi.h>
 #include <linux/pci.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/ioport.h>
 
 #include "core.h"
 #include "debug.h"
@@ -318,6 +321,26 @@ static void ath11k_mhi_op_write_reg(struct mhi_controller *mhi_cntrl,
 	writel(val, addr);
 }
 
+static int ath11k_mhi_read_addr_from_dt(struct mhi_controller *mhi_ctrl)
+{
+	struct device_node *np;
+	struct resource res;
+	int ret;
+
+	np = of_find_node_by_type(NULL, "memory");
+	if (!np)
+		return -ENOENT;
+
+	ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		return ret;
+
+	mhi_ctrl->iova_start = res.start + 0x1000000;
+	mhi_ctrl->iova_stop = res.end;
+
+	return 0;
+}
+
 int ath11k_mhi_register(struct ath11k_pci *ab_pci)
 {
 	struct ath11k_base *ab = ab_pci->ab;
@@ -349,8 +372,15 @@ int ath11k_mhi_register(struct ath11k_pci *ab_pci)
 	if (!test_bit(ATH11K_PCI_FLAG_MULTI_MSI_VECTORS, &ab_pci->flags))
 		mhi_ctrl->irq_flags = IRQF_SHARED | IRQF_NOBALANCING;
 
-	mhi_ctrl->iova_start = 0;
-	mhi_ctrl->iova_stop = 0xffffffff;
+	if (test_bit(ATH11K_FLAG_FIXED_MEM_RGN, &ab->dev_flags)) {
+		ret = ath11k_mhi_read_addr_from_dt(mhi_ctrl);
+		if (ret < 0)
+			return ret;
+	} else {
+		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;