2 * Copyright (C) 2011 Jana Rapava <fermata7@gmail.com>
3 * Copyright (C) 2011 CompuLab, Ltd. <www.compulab.co.il>
5 * Authors: Jana Rapava <fermata7@gmail.com>
6 * Igor Grinberg <grinberg@compulab.co.il>
9 * linux/drivers/usb/otg/ulpi.c
10 * Generic ULPI USB transceiver support
12 * Original Copyright follow:
13 * Copyright (C) 2009 Daniel Mack <daniel@caiaq.de>
15 * Based on sources from
17 * Sascha Hauer <s.hauer@pengutronix.de>
18 * Freescale Semiconductors
20 * SPDX-License-Identifier: GPL-2.0+
27 #define ULPI_ID_REGS_COUNT 4
28 #define ULPI_TEST_VALUE 0x55 /* 0x55 == 0b01010101 */
30 static struct ulpi_regs *ulpi = (struct ulpi_regs *)0;
32 static int ulpi_integrity_check(struct ulpi_viewport *ulpi_vp)
34 u32 val, tval = ULPI_TEST_VALUE;
37 /* Use the 'special' test value to check all bits */
38 for (i = 0; i < 2; i++, tval <<= 1) {
39 err = ulpi_write(ulpi_vp, &ulpi->scratch, tval);
43 val = ulpi_read(ulpi_vp, &ulpi->scratch);
45 printf("ULPI integrity check failed\n");
53 int ulpi_init(struct ulpi_viewport *ulpi_vp)
56 u8 *reg = &ulpi->product_id_high;
59 /* Assemble ID from four ULPI ID registers (8 bits each). */
60 for (i = 0; i < ULPI_ID_REGS_COUNT; i++) {
61 val = ulpi_read(ulpi_vp, reg - i);
62 if (val == ULPI_ERROR)
68 /* Split ID into vendor and product ID. */
69 debug("ULPI transceiver ID 0x%04x:0x%04x\n", id >> 16, id & 0xffff);
71 return ulpi_integrity_check(ulpi_vp);
74 int ulpi_select_transceiver(struct ulpi_viewport *ulpi_vp, unsigned speed)
76 u32 tspeed = ULPI_FC_FULL_SPEED;
80 case ULPI_FC_HIGH_SPEED:
81 case ULPI_FC_FULL_SPEED:
82 case ULPI_FC_LOW_SPEED:
87 printf("ULPI: %s: wrong transceiver speed specified: %u, "
88 "falling back to full speed\n", __func__, speed);
91 val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
92 if (val == ULPI_ERROR)
95 /* clear the previous speed setting */
96 val = (val & ~ULPI_FC_XCVRSEL_MASK) | tspeed;
98 return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val);
101 int ulpi_set_vbus(struct ulpi_viewport *ulpi_vp, int on, int ext_power)
103 u32 flags = ULPI_OTG_DRVVBUS;
104 u8 *reg = on ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
107 flags |= ULPI_OTG_DRVVBUS_EXT;
109 return ulpi_write(ulpi_vp, reg, flags);
112 int ulpi_set_vbus_indicator(struct ulpi_viewport *ulpi_vp, int external,
113 int passthu, int complement)
118 reg = external ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
119 val = ulpi_write(ulpi_vp, reg, ULPI_OTG_EXTVBUSIND);
123 flags = passthu ? ULPI_IFACE_PASSTHRU : 0;
124 flags |= complement ? ULPI_IFACE_EXTVBUS_COMPLEMENT : 0;
126 val = ulpi_read(ulpi_vp, &ulpi->iface_ctrl);
127 if (val == ULPI_ERROR)
130 val = val & ~(ULPI_IFACE_PASSTHRU & ULPI_IFACE_EXTVBUS_COMPLEMENT);
132 val = ulpi_write(ulpi_vp, &ulpi->iface_ctrl, val);
139 int ulpi_set_pd(struct ulpi_viewport *ulpi_vp, int enable)
141 u32 val = ULPI_OTG_DP_PULLDOWN | ULPI_OTG_DM_PULLDOWN;
142 u8 *reg = enable ? &ulpi->otg_ctrl_set : &ulpi->otg_ctrl_clear;
144 return ulpi_write(ulpi_vp, reg, val);
147 int ulpi_opmode_sel(struct ulpi_viewport *ulpi_vp, unsigned opmode)
149 u32 topmode = ULPI_FC_OPMODE_NORMAL;
153 case ULPI_FC_OPMODE_NORMAL:
154 case ULPI_FC_OPMODE_NONDRIVING:
155 case ULPI_FC_OPMODE_DISABLE_NRZI:
156 case ULPI_FC_OPMODE_NOSYNC_NOEOP:
160 printf("ULPI: %s: wrong OpMode specified: %u, "
161 "falling back to OpMode Normal\n", __func__, opmode);
164 val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
165 if (val == ULPI_ERROR)
168 /* clear the previous opmode setting */
169 val = (val & ~ULPI_FC_OPMODE_MASK) | topmode;
171 return ulpi_write(ulpi_vp, &ulpi->function_ctrl, val);
174 int ulpi_serial_mode_enable(struct ulpi_viewport *ulpi_vp, unsigned smode)
177 case ULPI_IFACE_6_PIN_SERIAL_MODE:
178 case ULPI_IFACE_3_PIN_SERIAL_MODE:
181 printf("ULPI: %s: unrecognized Serial Mode specified: %u\n",
186 return ulpi_write(ulpi_vp, &ulpi->iface_ctrl_set, smode);
189 int ulpi_suspend(struct ulpi_viewport *ulpi_vp)
193 err = ulpi_write(ulpi_vp, &ulpi->function_ctrl_clear,
196 printf("ULPI: %s: failed writing the suspend bit\n", __func__);
202 * Wait for ULPI PHY reset to complete.
203 * Actual wait for reset must be done in a view port specific way,
204 * because it involves checking the DIR line.
206 static int __ulpi_reset_wait(struct ulpi_viewport *ulpi_vp)
209 int timeout = CONFIG_USB_ULPI_TIMEOUT;
211 /* Wait for the RESET bit to become zero */
214 * This function is generic and suppose to work
215 * with any viewport, so we cheat here and don't check
216 * for the error of ulpi_read(), if there is one, then
217 * there will be a timeout.
219 val = ulpi_read(ulpi_vp, &ulpi->function_ctrl);
220 if (!(val & ULPI_FC_RESET))
226 printf("ULPI: %s: reset timed out\n", __func__);
230 int ulpi_reset_wait(struct ulpi_viewport *ulpi_vp)
231 __attribute__((weak, alias("__ulpi_reset_wait")));
233 int ulpi_reset(struct ulpi_viewport *ulpi_vp)
237 err = ulpi_write(ulpi_vp,
238 &ulpi->function_ctrl_set, ULPI_FC_RESET);
240 printf("ULPI: %s: failed writing reset bit\n", __func__);
244 return ulpi_reset_wait(ulpi_vp);