[people/ms/u-boot.git] / drivers / usb / musb / am35x.c

/*
 * am35x.c - TI's AM35x platform specific usb wrapper functions.
 *
 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
 *
 * Based on drivers/usb/musb/da8xx.c
 *
 * Copyright (c) 2010 Texas Instruments Incorporated
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>

#include "am35x.h"

/* MUSB platform configuration */
struct musb_config musb_cfg = {
	.regs		= (struct musb_regs *)AM35X_USB_OTG_CORE_BASE,
	.timeout	= AM35X_USB_OTG_TIMEOUT,
	.musb_speed	= 0,
};

/*
 * Enable the USB phy
 */
static u8 phy_on(void)
{
	u32 devconf2;
	u32 timeout;

	devconf2 = readl(&am35x_scm_general_regs->devconf2);

	devconf2 &= ~(DEVCONF2_RESET | DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN |
		      DEVCONF2_OTGMODE | DEVCONF2_REFFREQ |
		      DEVCONF2_PHY_GPIOMODE);
	devconf2 |= DEVCONF2_SESENDEN | DEVCONF2_VBDTCTEN | DEVCONF2_PHY_PLLON |
		    DEVCONF2_REFFREQ_13MHZ | DEVCONF2_DATPOL;

	writel(devconf2, &am35x_scm_general_regs->devconf2);

	/* wait until the USB phy is turned on */
	timeout = musb_cfg.timeout;
	while (timeout--)
		if (readl(&am35x_scm_general_regs->devconf2) & DEVCONF2_PHYCKGD)
			return 1;

	/* USB phy was not turned on */
	return 0;
}

/*
 * Disable the USB phy
 */
static void phy_off(void)
{
	u32 devconf2;

	/*
	 * Power down the on-chip PHY.
	 */
	devconf2 = readl(&am35x_scm_general_regs->devconf2);

	devconf2 &= ~DEVCONF2_PHY_PLLON;
	devconf2 |= DEVCONF2_PHYPWRDN | DEVCONF2_OTGPWRDN;
	writel(devconf2, &am35x_scm_general_regs->devconf2);
}

/*
 * This function performs platform specific initialization for usb0.
 */
int musb_platform_init(void)
{
	u32 revision;
	u32 sw_reset;

	/* global usb reset */
	sw_reset = readl(&am35x_scm_general_regs->ip_sw_reset);
	sw_reset |= (1 << 0);
	writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);
	sw_reset &= ~(1 << 0);
	writel(sw_reset, &am35x_scm_general_regs->ip_sw_reset);

	/* reset the controller */
	writel(0x1, &am35x_usb_regs->control);
	udelay(5000);

	/* start the on-chip usb phy and its pll */
	if (phy_on() == 0)
		return -1;

	/* Returns zero if e.g. not clocked */
	revision = readl(&am35x_usb_regs->revision);
	if (revision == 0)
		return -1;

	return 0;
}

/*
 * This function performs platform specific deinitialization for usb0.
 */
void musb_platform_deinit(void)
{
	/* Turn off the phy */
	phy_off();
}

/*
 * This function reads data from endpoint fifo for AM35x
 * which supports only 32bit read operation.
 *
 * ep           - endpoint number
 * length       - number of bytes to read from FIFO
 * fifo_data    - pointer to data buffer into which data is read
 */
__attribute__((weak))
void read_fifo(u8 ep, u32 length, void *fifo_data)
{
	u8  *data = (u8 *)fifo_data;
	u32 val;
	int i;

	/* select the endpoint index */
	writeb(ep, &musbr->index);

	if (length > 4) {
		for (i = 0; i < (length >> 2); i++) {
			val = readl(&musbr->fifox[ep]);
			memcpy(data, &val, 4);
			data += 4;
		}
		length %= 4;
	}
	if (length > 0) {
		val = readl(&musbr->fifox[ep]);
		memcpy(data, &val, length);
	}
}
Commit	Line	Data
dbea3242 AKG	1	/*
	2	* am35x.c - TI's AM35x platform specific usb wrapper functions.
	3	*
	4	* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
	5	*
	6	* Based on drivers/usb/musb/da8xx.c
	7	*
	8	* Copyright (c) 2010 Texas Instruments Incorporated
	9	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
dbea3242	11	*/
1a459660	12
dbea3242 AKG	13	#include <common.h>
	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	}
5689f4b5 AKG	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	}