ath11k: read and write registers below unwindowed address

For QCA6390, host can read and write registers below unwindowed
address directly without programming the window register. For
registers below bar0 + 4k - 32, host can read and write regardless
of the power save state. Shadow registers are located below
bar0 + 4K - 32.

Before MHI power up, there is no need to wakeup MHI so ini_done is
added to indicate it.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1601544890-13450-2-git-send-email-kvalo@codeaurora.org

diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index 69e5b7c..e72dca4 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -28,6 +28,12 @@
 #define TCSR_SOC_HW_VERSION_MAJOR_MASK GENMASK(16, 8)
 #define TCSR_SOC_HW_VERSION_MINOR_MASK GENMASK(7, 0)
 
+/* BAR0 + 4k is always accessible, and no
+ * need to force wakeup.
+ * 4K - 32 = 0xFE0
+ */
+#define ACCESS_ALWAYS_OFF 0xFE0
+
 #define QCA6390_DEVICE_ID              0x1101
 
 static const struct pci_device_id ath11k_pci_id_table[] = {
@@ -128,6 +134,13 @@ void ath11k_pci_write32(struct ath11k_base *ab, u32 offset, u32 value)
 {
        struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
 
+       /* for offset beyond BAR + 4K - 32, may
+        * need to wakeup MHI to access.
+        */
+       if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
+           offset >= ACCESS_ALWAYS_OFF)
+               mhi_device_get_sync(ab_pci->mhi_ctrl->mhi_dev);
+
        if (offset < WINDOW_START) {
                iowrite32(value, ab->mem  + offset);
        } else {
@@ -136,6 +149,10 @@ void ath11k_pci_write32(struct ath11k_base *ab, u32 offset, u32 value)
                iowrite32(value, ab->mem + WINDOW_START + (offset & WINDOW_RANGE_MASK));
                spin_unlock_bh(&ab_pci->window_lock);
        }
+
+       if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
+           offset >= ACCESS_ALWAYS_OFF)
+               mhi_device_put(ab_pci->mhi_ctrl->mhi_dev);
 }
 
 u32 ath11k_pci_read32(struct ath11k_base *ab, u32 offset)
@@ -143,6 +160,13 @@ u32 ath11k_pci_read32(struct ath11k_base *ab, u32 offset)
        struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
        u32 val;
 
+       /* for offset beyond BAR + 4K - 32, may
+        * need to wakeup MHI to access.
+        */
+       if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
+           offset >= ACCESS_ALWAYS_OFF)
+               mhi_device_get_sync(ab_pci->mhi_ctrl->mhi_dev);
+
        if (offset < WINDOW_START) {
                val = ioread32(ab->mem + offset);
        } else {
@@ -152,6 +176,10 @@ u32 ath11k_pci_read32(struct ath11k_base *ab, u32 offset)
                spin_unlock_bh(&ab_pci->window_lock);
        }
 
+       if (test_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags) &&
+           offset >= ACCESS_ALWAYS_OFF)
+               mhi_device_put(ab_pci->mhi_ctrl->mhi_dev);
+
        return val;
 }
 
@@ -731,6 +759,8 @@ static int ath11k_pci_power_up(struct ath11k_base *ab)
        struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
        int ret;
 
+       ab_pci->register_window = 0;
+       clear_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags);
        ath11k_pci_sw_reset(ab_pci->ab);
 
        ret = ath11k_mhi_start(ab_pci);
@@ -747,6 +777,7 @@ static void ath11k_pci_power_down(struct ath11k_base *ab)
        struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
 
        ath11k_mhi_stop(ab_pci);
+       clear_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags);
        ath11k_pci_force_wake(ab_pci->ab);
        ath11k_pci_sw_reset(ab_pci->ab);
 }
@@ -775,6 +806,10 @@ static void ath11k_pci_stop(struct ath11k_base *ab)
 
 static int ath11k_pci_start(struct ath11k_base *ab)
 {
+       struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
+
+       set_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags);
+
        ath11k_pci_ce_irqs_enable(ab);
        ath11k_ce_rx_post_buf(ab);
 

diff --git a/drivers/net/wireless/ath/ath11k/pci.h b/drivers/net/wireless/ath/ath11k/pci.h
index f2f280e..43562f7 100644 (file)
--- a/drivers/net/wireless/ath/ath11k/pci.h
+++ b/drivers/net/wireless/ath/ath11k/pci.h
@@ -36,6 +36,10 @@ struct ath11k_msi_config {
        struct ath11k_msi_user *users;
 };
 
+enum ath11k_pci_flags {
+       ATH11K_PCI_FLAG_INIT_DONE,
+};
+
 struct ath11k_pci {
        struct pci_dev *pdev;
        struct ath11k_base *ab;
@@ -48,6 +52,9 @@ struct ath11k_pci {
 
        /* protects register_window above */
        spinlock_t window_lock;
+
+       /* enum ath11k_pci_flags */
+       unsigned long flags;
 };
 
 static inline struct ath11k_pci *ath11k_pci_priv(struct ath11k_base *ab)