diff options
| author | Jules Maselbas <jmaselbas@kalray.eu> | 2020-08-11 17:16:34 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-08-14 14:05:17 +0200 |
| commit | b64e3b65a4952851cd7e608c2a2277203f1557cb (patch) | |
| tree | 0f8977e4554ca32711a00f120bc6b5662d08f935 /drivers/usb | |
| parent | d179b1ae8edd376be33431e8c2efa7a90fcc0576 (diff) | |
| download | barebox-b64e3b65a4952851cd7e608c2a2277203f1557cb.tar.gz barebox-b64e3b65a4952851cd7e608c2a2277203f1557cb.tar.xz | |
usb: dwc2: Add function to flush tx fifo
Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc2/core.c | 33 | ||||
| -rw-r--r-- | drivers/usb/dwc2/dwc2.h | 1 |
2 files changed, 34 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c index 6e8d30c224..a8693097da 100644 --- a/drivers/usb/dwc2/core.c +++ b/drivers/usb/dwc2/core.c @@ -294,6 +294,39 @@ void dwc2_flush_all_fifo(struct dwc2 *dwc2) udelay(1); } +/** + * dwc2_flush_tx_fifo() - Flushes a Tx FIFO + * + * @hsotg: Programming view of DWC_otg controller + * @idx: The fifo index (0..15) + */ +void dwc2_flush_tx_fifo(struct dwc2 *dwc2, const int idx) +{ + u32 greset; + + if (idx > 15) + return; + + dwc2_dbg(dwc2, "Flush Tx FIFO %d\n", idx); + + /* Wait for AHB master IDLE state */ + if (dwc2_wait_bit_set(dwc2, GRSTCTL, GRSTCTL_AHBIDLE, 10000)) { + dwc2_warn(dwc2, "%s: Timeout waiting for AHB Idle\n", __func__); + return; + } + + greset = GRSTCTL_TXFFLSH; + greset |= GRSTCTL_TXFNUM(idx) & GRSTCTL_TXFNUM_MASK; + dwc2_writel(dwc2, greset, GRSTCTL); + + if (dwc2_wait_bit_clear(dwc2, GRSTCTL, GRSTCTL_TXFFLSH, 10000)) + dwc2_warn(dwc2, "%s: Timeout flushing tx fifo (GRSTCTL=%08x)\n", + __func__, dwc2_readl(dwc2, GRSTCTL)); + + /* Wait for at least 3 PHY Clocks */ + udelay(1); +} + static int dwc2_fs_phy_init(struct dwc2 *dwc2, bool select_phy) { u32 usbcfg, ggpio, i2cctl; diff --git a/drivers/usb/dwc2/dwc2.h b/drivers/usb/dwc2/dwc2.h index c103854755..f620175df3 100644 --- a/drivers/usb/dwc2/dwc2.h +++ b/drivers/usb/dwc2/dwc2.h @@ -17,6 +17,7 @@ void dwc2_get_hwparams(struct dwc2 *dwc2); void dwc2_init_fs_ls_pclk_sel(struct dwc2 *dwc2); void dwc2_flush_all_fifo(struct dwc2 *dwc2); +void dwc2_flush_tx_fifo(struct dwc2 *dwc2, const int idx); int dwc2_phy_init(struct dwc2 *dwc2, bool select_phy); int dwc2_gahbcfg_init(struct dwc2 *dwc2); |