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>
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index ce04897..50cd23b 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -86,6 +86,7 @@
[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 @@
[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 @@
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 @@
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;
}