usb: chipidea: add tx/rx burst size configuration interface

The user can adjust it through dts or platform data

Signed-off-by: Peter Chen <peter.chen@freescale.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index ce0489754fde..50cd23b3b7f1 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -86,6 +86,7 @@ static const u8 ci_regs_nolpm[] = {
         [OP_DEVICEADDR]         = 0x14U,
         [OP_ENDPTLISTADDR]      = 0x18U,
         [OP_TTCTRL]             = 0x1CU,
+        [OP_BURSTSIZE]          = 0x20U,
         [OP_PORTSC]             = 0x44U,
         [OP_DEVLC]              = 0x84U,
         [OP_OTGSC]              = 0x64U,
@@ -109,6 +110,7 @@ static const u8 ci_regs_lpm[] = {
         [OP_DEVICEADDR]         = 0x14U,
         [OP_ENDPTLISTADDR]      = 0x18U,
         [OP_TTCTRL]             = 0x1CU,
+        [OP_BURSTSIZE]          = 0x20U,
         [OP_PORTSC]             = 0x44U,
         [OP_DEVLC]              = 0x84U,
         [OP_OTGSC]              = 0xC4U,
@@ -441,6 +443,17 @@ void ci_platform_configure(struct ci_hdrc *ci)
         if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
                 hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
                         ci->platdata->ahb_burst_config);
+
+        /* override burst size, take effect only when ahb_burst_config is 0 */
+        if (!hw_read_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK)) {
+                if (ci->platdata->flags & CI_HDRC_OVERRIDE_TX_BURST)
+                        hw_write(ci, OP_BURSTSIZE, TX_BURST_MASK,
+                        ci->platdata->tx_burst_size << __ffs(TX_BURST_MASK));
+
+                if (ci->platdata->flags & CI_HDRC_OVERRIDE_RX_BURST)
+                        hw_write(ci, OP_BURSTSIZE, RX_BURST_MASK,
+                                ci->platdata->rx_burst_size);
+        }
 }
 
 /**
@@ -647,6 +660,28 @@ static int ci_get_platdata(struct device *dev,
                 platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
         }
 
+        if (of_find_property(dev->of_node, "tx-burst-size-dword", NULL)) {
+                ret = of_property_read_u32(dev->of_node, "tx-burst-size-dword",
+                        &platdata->tx_burst_size);
+                if (ret) {
+                        dev_err(dev,
+                                "failed to get tx-burst-size-dword\n");
+                        return ret;
+                }
+                platdata->flags |= CI_HDRC_OVERRIDE_TX_BURST;
+        }
+
+        if (of_find_property(dev->of_node, "rx-burst-size-dword", NULL)) {
+                ret = of_property_read_u32(dev->of_node, "rx-burst-size-dword",
+                        &platdata->rx_burst_size);
+                if (ret) {
+                        dev_err(dev,
+                                "failed to get rx-burst-size-dword\n");
+                        return ret;
+                }
+                platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
+        }
+
         return 0;
 }