[thirdparty/u-boot.git] / drivers / usb / musb / da8xx.c

/*
 * da8xx.c - TI's DA8xx platform specific usb wrapper functions.
 *
 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
 *
 * Based on drivers/usb/musb/davinci.c
 *
 * Copyright (C) 2009 Texas Instruments Incorporated
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <common.h>

#include "musb_core.h"
#include <asm/arch/da8xx-usb.h>

/* MUSB platform configuration */
struct musb_config musb_cfg = {
	.regs		= (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
	.timeout	= DA8XX_USB_OTG_TIMEOUT,
	.musb_speed	= 0,
};

/*
 * This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
 */
static void enable_vbus(void)
{
	u32 value;

	/* configure GPIO bank4 pin 15 in output direction */
	value = readl(&davinci_gpio_bank45->dir);
	writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);

	/* set GPIO bank4 pin 15 high to drive VBUS */
	value = readl(&davinci_gpio_bank45->set_data);
	writel((value | DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
}

/*
 * Enable the usb0 phy. This initialization procedure is explained in
 * the DA8xx USB user guide document.
 */
static u8 phy_on(void)
{
	u32 timeout;
	u32 cfgchip2;

	cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);

	cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN |
		      CFGCHIP2_OTGMODE | CFGCHIP2_REFFREQ);
	cfgchip2 |= CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN | CFGCHIP2_PHY_PLLON |
		    CFGCHIP2_REFFREQ_24MHZ;

	writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);

	/* wait until the usb phy pll locks */
	timeout = musb_cfg.timeout;
	while (timeout--)
		if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
			return 1;

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

/*
 * Disable the usb phy
 */
static void phy_off(void)
{
	u32 cfgchip2;

	/*
	 * Power down the on-chip PHY.
	 */
	cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
	cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
	cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
	writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
}

/*
 * This function performs DA8xx platform specific initialization for usb0.
 */
int musb_platform_init(void)
{
	u32  revision;

	/* enable psc for usb2.0 */
	lpsc_on(33);

	/* enable usb vbus */
	enable_vbus();

	/* reset the controller */
	writel(0x1, &da8xx_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(&da8xx_usb_regs->revision);
	if (revision == 0)
		return -1;

	/* Disable all interrupts */
	writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
		DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
	return 0;
}

/*
 * This function performs DA8xx platform specific deinitialization for usb0.
 */
void musb_platform_deinit(void)
{
	/* Turn of the phy */
	phy_off();

	/* flush any interrupts */
	writel((DA8XX_USB_USBINT_MASK | DA8XX_USB_TXINT_MASK |
		DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
	writel(0, &da8xx_usb_regs->eoi);
}
Commit	Line	Data
7359273d AKG	1	/*
	2	* da8xx.c - TI's DA8xx platform specific usb wrapper functions.
	3	*
	4	* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
	5	*
	6	* Based on drivers/usb/musb/davinci.c
	7	*
	8	* Copyright (C) 2009 Texas Instruments Incorporated
	9	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
7359273d AKG	11	*/
	12	#include <common.h>
	13
25f8bf6e SG	14	#include "musb_core.h"
25f8bf6e SG	15	#include <asm/arch/da8xx-usb.h>
7359273d AKG	16
	17	/* MUSB platform configuration */
	18	struct musb_config musb_cfg = {
bbf4c01e AKG	19	.regs = (struct musb_regs *)DA8XX_USB_OTG_CORE_BASE,
	20	.timeout = DA8XX_USB_OTG_TIMEOUT,
	21	.musb_speed = 0,
7359273d AKG	22	};
	23
	24	/*
	25	* This function enables VBUS by driving the GPIO Bank4 Pin 15 high.
	26	*/
	27	static void enable_vbus(void)
	28	{
	29	u32 value;
	30
	31	/* configure GPIO bank4 pin 15 in output direction */
	32	value = readl(&davinci_gpio_bank45->dir);
	33	writel((value & (~DA8XX_USB_VBUS_GPIO)), &davinci_gpio_bank45->dir);
	34
	35	/* set GPIO bank4 pin 15 high to drive VBUS */
	36	value = readl(&davinci_gpio_bank45->set_data);
	37	writel((value \| DA8XX_USB_VBUS_GPIO), &davinci_gpio_bank45->set_data);
	38	}
	39
	40	/*
	41	* Enable the usb0 phy. This initialization procedure is explained in
	42	* the DA8xx USB user guide document.
	43	*/
	44	static u8 phy_on(void)
	45	{
	46	u32 timeout;
	47	u32 cfgchip2;
	48
	49	cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
	50
	51	cfgchip2 &= ~(CFGCHIP2_RESET \| CFGCHIP2_PHYPWRDN \| CFGCHIP2_OTGPWRDN \|
	52	CFGCHIP2_OTGMODE \| CFGCHIP2_REFFREQ);
	53	cfgchip2 \|= CFGCHIP2_SESENDEN \| CFGCHIP2_VBDTCTEN \| CFGCHIP2_PHY_PLLON \|
	54	CFGCHIP2_REFFREQ_24MHZ;
	55
	56	writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
	57
	58	/* wait until the usb phy pll locks */
	59	timeout = musb_cfg.timeout;
	60	while (timeout--)
	61	if (readl(&davinci_syscfg_regs->cfgchip2) & CFGCHIP2_PHYCLKGD)
	62	return 1;
	63
	64	/* USB phy was not turned on */
	65	return 0;
	66	}
	67
	68	/*
	69	* Disable the usb phy
	70	*/
	71	static void phy_off(void)
	72	{
	73	u32 cfgchip2;
	74
	75	/*
	76	* Power down the on-chip PHY.
	77	*/
	78	cfgchip2 = readl(&davinci_syscfg_regs->cfgchip2);
	79	cfgchip2 &= ~CFGCHIP2_PHY_PLLON;
	80	cfgchip2 \|= CFGCHIP2_PHYPWRDN \| CFGCHIP2_OTGPWRDN;
	81	writel(cfgchip2, &davinci_syscfg_regs->cfgchip2);
	82	}
	83
	84	/*
	85	* This function performs DA8xx platform specific initialization for usb0.
86	*/
87	int musb_platform_init(void)
88	{
89	u32 revision;
90
91	/* enable psc for usb2.0 */
92	lpsc_on(33);
93
94	/* enable usb vbus */
95	enable_vbus();
96
97	/* reset the controller */
98	writel(0x1, &da8xx_usb_regs->control);
99	udelay(5000);
100
101	/* start the on-chip usb phy and its pll */
102	if (phy_on() == 0)
103	return -1;
104
105	/* Returns zero if e.g. not clocked */
106	revision = readl(&da8xx_usb_regs->revision);
107	if (revision == 0)
108	return -1;
109
110	/* Disable all interrupts */
111	writel((DA8XX_USB_USBINT_MASK \| DA8XX_USB_TXINT_MASK \|
112	DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_set);
113	return 0;
114	}
115
116	/*
117	* This function performs DA8xx platform specific deinitialization for usb0.
118	*/
119	void musb_platform_deinit(void)
120	{
121	/* Turn of the phy */
122	phy_off();
123
124	/* flush any interrupts */
125	writel((DA8XX_USB_USBINT_MASK \| DA8XX_USB_TXINT_MASK \|
126	DA8XX_USB_RXINT_MASK), &da8xx_usb_regs->intmsk_clr);
127	writel(0, &da8xx_usb_regs->eoi);
128	}