Tom Rini | 83d290c | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Ajay Kumar Gupta | dbea324 | 2010-07-09 11:43:48 +0530 | [diff] [blame] | 2 | /* |
| 3 | * am35x.c - TI's AM35x platform specific usb wrapper functions. |
| 4 | * |
| 5 | * Author: Ajay Kumar Gupta <ajay.gupta@ti.com> |
| 6 | * |
| 7 | * Based on drivers/usb/musb/da8xx.c |
| 8 | * |
| 9 | * Copyright (c) 2010 Texas Instruments Incorporated |
Ajay Kumar Gupta | dbea324 | 2010-07-09 11:43:48 +0530 | [diff] [blame] | 10 | */ |
Wolfgang Denk | 1a45966 | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 11 | |
Ajay Kumar Gupta | dbea324 | 2010-07-09 11:43:48 +0530 | [diff] [blame] | 12 | #include <common.h> |
Simon Glass | c05ed00 | 2020-05-10 11:40:11 -0600 | [diff] [blame] | 13 | #include <linux/delay.h> |
Ajay Kumar Gupta | dbea324 | 2010-07-09 11:43:48 +0530 | [diff] [blame] | 14 | |
| 15 | #include "am35x.h" |
| 16 | |
| 17 | /* MUSB platform configuration */ |
| 18 | struct musb_config musb_cfg = { |
| 19 | .regs = (struct musb_regs *)AM35X_USB_OTG_CORE_BASE, |
| 20 | .timeout = AM35X_USB_OTG_TIMEOUT, |
| 21 | .musb_speed = 0, |
| 22 | }; |
| 23 | |
| 24 | /* |
| 25 | * Enable the USB phy |
| 26 | */ |
| 27 | static u8 phy_on(void) |
| 28 | { |
| 29 | u32 devconf2; |
| 30 | u32 timeout; |
| 31 | |
| 32 | devconf2 = readl(&am35x_scm_general_regs->devconf2); |
| 33 | |
| 34 | devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN | |
| 35 | DEVCONF2_OTGMODE | DEVCONF2_REFFREQ | |
| 36 | DEVCONF2_PHY_GPIOMODE); |
| 37 | devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON | |
| 38 | DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL; |
| 39 | |
| 40 | writel(devconf2, &am35x_scm_general_regs->devconf2); |
| 41 | |
| 42 | /* wait until the USB phy is turned on */ |
| 43 | timeout = musb_cfg.timeout; |
| 44 | while (timeout--) |
| 45 | if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD) |
| 46 | return 1; |
| 47 | |
| 48 | /* USB phy was not turned on */ |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Disable the USB phy |
| 54 | */ |
| 55 | static void phy_off(void) |
| 56 | { |
| 57 | u32 devconf2; |
| 58 | |
| 59 | /* |
| 60 | * Power down the on-chip PHY. |
| 61 | */ |
| 62 | devconf2 = readl(&am35x_scm_general_regs->devconf2); |
| 63 | |
| 64 | devconf2 &= ~DEVCONF2_PHY_PLLON; |
| 65 | devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN; |
| 66 | writel(devconf2, &am35x_scm_general_regs->devconf2); |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * This function performs platform specific initialization for usb0. |
| 71 | */ |
| 72 | int musb_platform_init(void) |
| 73 | { |
| 74 | u32 revision; |
| 75 | u32 sw_reset; |
| 76 | |
| 77 | /* global usb reset */ |
| 78 | sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset); |
| 79 | sw_reset |= (1 << 0); |
| 80 | writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); |
| 81 | sw_reset &= ~(1 << 0); |
| 82 | writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset); |
| 83 | |
| 84 | /* reset the controller */ |
| 85 | writel(0x1, &am35x_usb_regs->control); |
| 86 | udelay(5000); |
| 87 | |
| 88 | /* start the on-chip usb phy and its pll */ |
| 89 | if (phy_on() == 0) |
| 90 | return -1; |
| 91 | |
| 92 | /* Returns zero if e.g. not clocked */ |
| 93 | revision = readl(&am35x_usb_regs->revision); |
| 94 | if (revision == 0) |
| 95 | return -1; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * This function performs platform specific deinitialization for usb0. |
| 102 | */ |
| 103 | void musb_platform_deinit(void) |
| 104 | { |
| 105 | /* Turn off the phy */ |
| 106 | phy_off(); |
| 107 | } |
Ajay Kumar Gupta | 5689f4b | 2010-07-09 11:43:49 +0530 | [diff] [blame] | 108 | |
| 109 | /* |
| 110 | * This function reads data from endpoint fifo for AM35x |
| 111 | * which supports only 32bit read operation. |
| 112 | * |
| 113 | * ep - endpoint number |
| 114 | * length - number of bytes to read from FIFO |
| 115 | * fifo_data - pointer to data buffer into which data is read |
| 116 | */ |
| 117 | __attribute__((weak)) |
| 118 | void read_fifo(u8 ep, u32 length, void *fifo_data) |
| 119 | { |
| 120 | u8 *data = (u8 *)fifo_data; |
| 121 | u32 val; |
| 122 | int i; |
| 123 | |
| 124 | /* select the endpoint index */ |
| 125 | writeb(ep, &musbr->index); |
| 126 | |
| 127 | if (length > 4) { |
| 128 | for (i = 0; i < (length >> 2); i++) { |
| 129 | val = readl(&musbr->fifox[ep]); |
| 130 | memcpy(data, &val, 4); |
| 131 | data += 4; |
| 132 | } |
| 133 | length %= 4; |
| 134 | } |
| 135 | if (length > 0) { |
| 136 | val = readl(&musbr->fifox[ep]); |
| 137 | memcpy(data, &val, length); |
| 138 | } |
| 139 | } |