diff options
Diffstat (limited to 'drivers/usb/musb/musb_core.c')
| -rw-r--r-- | drivers/usb/musb/musb_core.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c new file mode 100644 index 0000000000..ec57fc811c --- /dev/null +++ b/drivers/usb/musb/musb_core.c @@ -0,0 +1,141 @@ +/* + * Mentor USB OTG Core functionality common for both Host and Device + * functionality. + * + * Copyright (c) 2008 Texas Instruments + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments + */ + +#include <common.h> + +#include "musb_core.h" +struct musb_regs *musbr; + +/* + * program the mentor core to start (enable interrupts, dma, etc.) + */ +void musb_start(void) +{ + u8 devctl; + + /* disable all interrupts */ + writew(0, &musbr->intrtxe); + writew(0, &musbr->intrrxe); + writeb(0, &musbr->intrusbe); + writeb(0, &musbr->testmode); + + /* put into basic highspeed mode and start session */ + writeb(MUSB_POWER_HSENAB, &musbr->power); +#if defined(CONFIG_MUSB_HCD) + devctl = readb(&musbr->devctl); + writeb(devctl | MUSB_DEVCTL_SESSION, &musbr->devctl); +#endif +} + +/* + * This function configures the endpoint configuration. The musb hcd or musb + * device implementation can use this function to configure the endpoints + * and set the FIFO sizes. Note: The summation of FIFO sizes of all endpoints + * should not be more than the available FIFO size. + * + * epinfo - Pointer to EP configuration table + * cnt - Number of entries in the EP conf table. + */ +void musb_configure_ep(struct musb_epinfo *epinfo, u8 cnt) +{ + u16 csr; + u16 fifoaddr = 64; /* First 64 bytes of FIFO reserved for EP0 */ + u32 fifosize; + u8 idx; + + while (cnt--) { + /* prepare fifosize to write to register */ + fifosize = epinfo->epsize >> 3; + idx = ffs(fifosize) - 1; + + writeb(epinfo->epnum, &musbr->index); + if (epinfo->epdir) { + /* Configure fifo size and fifo base address */ + writeb(idx, &musbr->txfifosz); + writew(fifoaddr >> 3, &musbr->txfifoadd); +#if defined(CONFIG_MUSB_HCD) + /* clear the data toggle bit */ + csr = readw(&musbr->txcsr); + writew(csr | MUSB_TXCSR_CLRDATATOG, &musbr->txcsr); +#endif + /* Flush fifo if required */ + if (csr & MUSB_TXCSR_TXPKTRDY) + writew(csr | MUSB_TXCSR_FLUSHFIFO, + &musbr->txcsr); + } else { + /* Configure fifo size and fifo base address */ + writeb(idx, &musbr->rxfifosz); + writew(fifoaddr >> 3, &musbr->rxfifoadd); +#if defined(CONFIG_MUSB_HCD) + /* clear the data toggle bit */ + csr = readw(&musbr->rxcsr); + writew(csr | MUSB_RXCSR_CLRDATATOG, &musbr->rxcsr); +#endif + /* Flush fifo if required */ + if (csr & MUSB_RXCSR_RXPKTRDY) + writew(csr | MUSB_RXCSR_FLUSHFIFO, + &musbr->rxcsr); + } + fifoaddr += epinfo->epsize; + epinfo++; + } +} + +/* + * This function writes data to endpoint fifo + * + * ep - endpoint number + * length - number of bytes to write to FIFO + * fifo_data - Pointer to data buffer that contains the data to write + */ +void write_fifo(u8 ep, u32 length, void *fifo_data) +{ + u8 *data = (u8 *)fifo_data; + + /* select the endpoint index */ + writeb(ep, &musbr->index); + + /* write the data to the fifo */ + while (length--) + writeb(*data++, &musbr->fifox[ep]); +} + +/* + * This function reads data from endpoint fifo + * + * ep - endpoint number + * length - number of bytes to read from FIFO + * fifo_data - pointer to data buffer into which data is read + */ +void read_fifo(u8 ep, u32 length, void *fifo_data) +{ + u8 *data = (u8 *)fifo_data; + + /* select the endpoint index */ + writeb(ep, &musbr->index); + + /* read the data to the fifo */ + while (length--) + *data++ = readb(&musbr->fifox[ep]); +} |