// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2011 Jana Rapava * Copyright (C) 2011 CompuLab, Ltd. * * Authors: Jana Rapava * Igor Grinberg * * Based on: * linux/drivers/usb/otg/ulpi.c * Generic ULPI USB transceiver support * * Original Copyright follow: * Copyright (C) 2009 Daniel Mack * * Based on sources from * * Sascha Hauer * Freescale Semiconductors */ #include #include #include #include #include #define ULPI_ID_REGS_COUNT 4 #define ULPI_TEST_VALUE 0x55 /* 0x55 == 0b01010101 */ static struct ulpi_regs *ulpi = (struct ulpi_regs *)0; static int ulpi_integrity_check(struct ulpi_viewport *ulpi_vp) { u32 val, tval = ULPI_TEST_VALUE; int err, i; /* Use the 'special' test value to check all bits */ for (i = 0; i < 2; i++, tval <<= 1) { err = ulpi_write(ulpi_vp, &ulpi->scratch, tval); if (err) return err; val = ulpi_read(ulpi_vp, &ulpi->scratch); if (val != tval) { printf("ULPI integrity check failed\n"); return val; } } return 0; } int ulpi_init(struct ulpi_viewport *ulpi_vp) { u32 val, id = 0; u8 *reg = &ulpi->product_id_high; int i; /* Assemble ID from four ULPI ID registers (8 bits each). */ for (i = 0; i < ULPI_ID_REGS_COUNT; i++) { val = ulpi_read(ulpi_vp, reg - i); if (val == ULPI_ERROR) return val; id = (id << 8) | val; } /* Split ID into vendor and product ID. */ debug("ULPI transceiver ID 0x%04x:0x%04x\n", id >> 16, id & 0xffff); return ulpi_integrity_check(ulpi_vp); } int ulpi_select_transceiver(struct ulpi_viewport *ulpi_vp, unsigned speed) { u32 tspeed = ULPI_FC_FULL_SPEED; u32 val; switch (speed) { case ULPI_FC_HIGH_SPEED: case ULPI_FC_FULL_SPEED: case ULPI_FC_LOW_SPEED: case ULPI_FC_FS4LS: tspeed = speed; break; default: printf("ULPI: %s: wrong transceiver speed specified: %u, " "falling back to full speed\n", __func__, speed); } val = ulpi_read(ulpi_vp, &ulpi->function_ctrl); if (val == ULPI_ERROR) return val; /* clear the previous speed setting */ val = (val & ~ULPI_FC_XCVRSEL_MASK) | tspeed; return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val); } int ulpi_set_vbus(struct ulpi_viewport *ulpi_vp, int on, int ext_power) { u32 flags = ULPI_OTG_DRVVBUS; u8 *reg = on ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear; if (ext_power) flags |= ULPI_OTG_DRVVBUS_EXT; return ulpi_write(ulpi_vp, reg, flags); } int ulpi_set_vbus_indicator(struct ulpi_viewport *ulpi_vp, int external, int passthu, int complement) { u32 flags, val; u8 *reg; reg = external ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear; val = ulpi_write(ulpi_vp, reg, ULPI_OTG_EXTVBUSIND); if (val) return val; flags = passthu ? ULPI_IFACE_PASSTHRU : 0; flags |= complement ? ULPI_IFACE_EXTVBUS_COMPLEMENT : 0; val = ulpi_read(ulpi_vp, &ulpi->iface_ctrl); if (val == ULPI_ERROR) return val; val = val & ~(ULPI_IFACE_PASSTHRU & ULPI_IFACE_EXTVBUS_COMPLEMENT); val |= flags; val = ulpi_write(ulpi_vp, &ulpi->iface_ctrl, val); if (val) return val; return 0; } int ulpi_set_pd(struct ulpi_viewport *ulpi_vp, int enable) { u32 val = ULPI_OTG_DP_PULLDOWN | ULPI_OTG_DM_PULLDOWN; u8 *reg = enable ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear; return ulpi_write(ulpi_vp, reg, val); } int ulpi_opmode_sel(struct ulpi_viewport *ulpi_vp, unsigned opmode) { u32 topmode = ULPI_FC_OPMODE_NORMAL; u32 val; switch (opmode) { case ULPI_FC_OPMODE_NORMAL: case ULPI_FC_OPMODE_NONDRIVING: case ULPI_FC_OPMODE_DISABLE_NRZI: case ULPI_FC_OPMODE_NOSYNC_NOEOP: topmode = opmode; break; default: printf("ULPI: %s: wrong OpMode specified: %u, " "falling back to OpMode Normal\n", __func__, opmode); } val = ulpi_read(ulpi_vp, &ulpi->function_ctrl); if (val == ULPI_ERROR) return val; /* clear the previous opmode setting */ val = (val & ~ULPI_FC_OPMODE_MASK) | topmode; return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val); } int ulpi_serial_mode_enable(struct ulpi_viewport *ulpi_vp, unsigned smode) { switch (smode) { case ULPI_IFACE_6_PIN_SERIAL_MODE: case ULPI_IFACE_3_PIN_SERIAL_MODE: break; default: printf("ULPI: %s: unrecognized Serial Mode specified: %u\n", __func__, smode); return ULPI_ERROR; } return ulpi_write(ulpi_vp, &ulpi->iface_ctrl_set, smode); } int ulpi_suspend(struct ulpi_viewport *ulpi_vp) { int err; err = ulpi_write(ulpi_vp, &ulpi->function_ctrl_clear, ULPI_FC_SUSPENDM); if (err) printf("ULPI: %s: failed writing the suspend bit\n", __func__); return err; } /* * Wait for ULPI PHY reset to complete. * Actual wait for reset must be done in a view port specific way, * because it involves checking the DIR line. */ static int __ulpi_reset_wait(struct ulpi_viewport *ulpi_vp) { u32 val; int timeout = CFG_USB_ULPI_TIMEOUT; /* Wait for the RESET bit to become zero */ while (--timeout) { /* * This function is generic and suppose to work * with any viewport, so we cheat here and don't check * for the error of ulpi_read(), if there is one, then * there will be a timeout. */ val = ulpi_read(ulpi_vp, &ulpi->function_ctrl); if (!(val & ULPI_FC_RESET)) return 0; udelay(1); } printf("ULPI: %s: reset timed out\n", __func__); return ULPI_ERROR; } int ulpi_reset_wait(struct ulpi_viewport *ulpi_vp) __attribute__((weak, alias("__ulpi_reset_wait"))); int ulpi_reset(struct ulpi_viewport *ulpi_vp) { int err; err = ulpi_write(ulpi_vp, &ulpi->function_ctrl_set, ULPI_FC_RESET); if (err) { printf("ULPI: %s: failed writing reset bit\n", __func__); return err; } return ulpi_reset_wait(ulpi_vp); }