1 // SPDX-License-Identifier: GPL-2.0+
3 * Mentor USB OTG Core functionality common for both Host and Device
6 * Copyright (c) 2008 Texas Instruments
8 * Author: Thomas Abraham t-abraham@ti.com, Texas Instruments
12 #include <linux/bitops.h>
14 #include "musb_core.h"
15 struct musb_regs *musbr;
18 * program the mentor core to start (enable interrupts, dma, etc.)
22 #if defined(CONFIG_USB_MUSB_HCD)
27 /* disable all interrupts */
28 writew(0, &musbr->intrtxe);
29 writew(0, &musbr->intrrxe);
30 writeb(0, &musbr->intrusbe);
31 writeb(0, &musbr->testmode);
33 /* put into basic highspeed mode and start session */
34 writeb(MUSB_POWER_HSENAB, &musbr->power);
35 #if defined(CONFIG_USB_MUSB_HCD)
36 /* Program PHY to use EXT VBUS if required */
37 if (musb_cfg.extvbus == 1) {
38 busctl = musb_read_ulpi_buscontrol(musbr);
39 musb_write_ulpi_buscontrol(musbr, busctl | ULPI_USE_EXTVBUS);
42 devctl = readb(&musbr->devctl);
43 writeb(devctl | MUSB_DEVCTL_SESSION, &musbr->devctl);
47 #ifdef MUSB_NO_DYNAMIC_FIFO
48 # define config_fifo(dir, idx, addr)
50 # define config_fifo(dir, idx, addr) \
52 writeb(idx, &musbr->dir##fifosz); \
53 writew(fifoaddr >> 3, &musbr->dir##fifoadd); \
58 * This function configures the endpoint configuration. The musb hcd or musb
59 * device implementation can use this function to configure the endpoints
60 * and set the FIFO sizes. Note: The summation of FIFO sizes of all endpoints
61 * should not be more than the available FIFO size.
63 * epinfo - Pointer to EP configuration table
64 * cnt - Number of entries in the EP conf table.
66 void musb_configure_ep(const struct musb_epinfo *epinfo, u8 cnt)
69 u16 fifoaddr = 64; /* First 64 bytes of FIFO reserved for EP0 */
74 /* prepare fifosize to write to register */
75 fifosize = epinfo->epsize >> 3;
76 idx = ffs(fifosize) - 1;
78 writeb(epinfo->epnum, &musbr->index);
80 /* Configure fifo size and fifo base address */
81 config_fifo(tx, idx, fifoaddr);
83 csr = readw(&musbr->txcsr);
84 #if defined(CONFIG_USB_MUSB_HCD)
85 /* clear the data toggle bit */
86 writew(csr | MUSB_TXCSR_CLRDATATOG, &musbr->txcsr);
88 /* Flush fifo if required */
89 if (csr & MUSB_TXCSR_TXPKTRDY)
90 writew(csr | MUSB_TXCSR_FLUSHFIFO,
93 /* Configure fifo size and fifo base address */
94 config_fifo(rx, idx, fifoaddr);
96 csr = readw(&musbr->rxcsr);
97 #if defined(CONFIG_USB_MUSB_HCD)
98 /* clear the data toggle bit */
99 writew(csr | MUSB_RXCSR_CLRDATATOG, &musbr->rxcsr);
101 /* Flush fifo if required */
102 if (csr & MUSB_RXCSR_RXPKTRDY)
103 writew(csr | MUSB_RXCSR_FLUSHFIFO,
106 fifoaddr += epinfo->epsize;
112 * This function writes data to endpoint fifo
114 * ep - endpoint number
115 * length - number of bytes to write to FIFO
116 * fifo_data - Pointer to data buffer that contains the data to write
118 __attribute__((weak))
119 void write_fifo(u8 ep, u32 length, void *fifo_data)
121 u8 *data = (u8 *)fifo_data;
123 /* select the endpoint index */
124 writeb(ep, &musbr->index);
126 /* write the data to the fifo */
128 writeb(*data++, &musbr->fifox[ep]);
132 * AM35x supports only 32bit read operations so
133 * use seperate read_fifo() function for it.
135 #ifndef CONFIG_USB_AM35X
137 * This function reads data from endpoint fifo
139 * ep - endpoint number
140 * length - number of bytes to read from FIFO
141 * fifo_data - pointer to data buffer into which data is read
143 __attribute__((weak))
144 void read_fifo(u8 ep, u32 length, void *fifo_data)
146 u8 *data = (u8 *)fifo_data;
148 /* select the endpoint index */
149 writeb(ep, &musbr->index);
151 /* read the data to the fifo */
153 *data++ = readb(&musbr->fifox[ep]);
155 #endif /* CONFIG_USB_AM35X */