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drivers/usbdev_synopsys_dwc2: improve FIFO allocation doc

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This commit is contained in:
Gunar Schorcht 2023-02-24 16:41:37 +01:00
parent 5b93c18414
commit 98b6d75c14
1 changed files with 23 additions and 1 deletions
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24
drivers/usbdev_synopsys_dwc2/usbdev_synopsys_dwc2.c
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@ -513,9 +513,29 @@ static void _configure_tx_fifo(dwc2_usb_otg_fshs_t *usbdev, size_t num,
usbdev->fifo_pos += wordlen;
}
/*
* GRFXSIZ, DWC2_USB_OTG_{HS,FS}_RX_FIFO_SIZE, DWC2_USB_OTG_FIFO_MIN_WORD_SIZE
* are given in 32-bit words
*
* +--------------------+
* | TX FIFO EPn IN |
* +--------------------+ GRFXSIZ + (n * DWC2_USB_OTG_FIFO_MIN_WORD_SIZE)
* | ... |
* +--------------------+ GRFXSIZ + (2 * DWC2_USB_OTG_FIFO_MIN_WORD_SIZE)
* | TX FIFO EP1 IN |
* +--------------------+ GRFXSIZ + (1 * DWC2_USB_OTG_FIFO_MIN_WORD_SIZE)
* | TX FIFO EP0 IN |
* +--------------------+ GRXFSIZ = DWC2_USB_OTG_{HS,FS}_RX_FIFO_SIZE
* | |
* | |
* | RX FIFO Shared OUT |
* | |
* | |
* +--------------------+ 0
*/
static void _configure_fifo(dwc2_usb_otg_fshs_t *usbdev)
{
/* TODO: cleanup, more dynamic, etc */
/* TODO: dynamic FIFO size handling */
const dwc2_usb_otg_fshs_config_t *conf = usbdev->config;
size_t rx_size = 0;
@ -531,9 +551,11 @@ static void _configure_fifo(dwc2_usb_otg_fshs_t *usbdev)
_global_regs(conf)->GRXFSIZ =
(_global_regs(conf)->GRXFSIZ & ~USB_OTG_GRXFSIZ_RXFD) |
rx_size;
/* set size and position of TX FIFO for EP0 IN */
_global_regs(conf)->DIEPTXF0_HNPTXFSIZ =
(DWC2_USB_OTG_FIFO_MIN_WORD_SIZE << USB_OTG_TX0FD_Pos) |
rx_size;
/* position of TX FIFO for EP1 IN */
usbdev->fifo_pos = (rx_size + DWC2_USB_OTG_FIFO_MIN_WORD_SIZE);
}