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u-boot/drivers/usb/dwc3/dwc3-omap.c
Kishon Vijay Abraham I 53de33fc00 usb: dwc3: dwc3-omap: add interrupt status API to check for interrupts 
Added an API to check for interrupt status. This API is generally
called from board file to check for interrupt status.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
2015-04-14 05:48:10 +02:00

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/**
* dwc3-omap.c - OMAP Specific Glue layer
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*
* Taken from Linux Kernel v3.19-rc1 (drivers/usb/dwc3/dwc3-omap.c) and ported
* to uboot.
*
* commit 7ee2566ff5 : usb: dwc3: dwc3-omap: get rid of ->prepare()/->complete()
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <malloc.h>
#include <asm/io.h>
#include <dwc3-omap-uboot.h>
#include <linux/usb/dwc3-omap.h>
#include <linux/ioport.h>
#include <linux/usb/otg.h>
#include <linux/compat.h>
#include "linux-compat.h"
/*
* All these registers belong to OMAP's Wrapper around the
* DesignWare USB3 Core.
*/
#define USBOTGSS_REVISION 0x0000
#define USBOTGSS_SYSCONFIG 0x0010
#define USBOTGSS_IRQ_EOI 0x0020
#define USBOTGSS_EOI_OFFSET 0x0008
#define USBOTGSS_IRQSTATUS_RAW_0 0x0024
#define USBOTGSS_IRQSTATUS_0 0x0028
#define USBOTGSS_IRQENABLE_SET_0 0x002c
#define USBOTGSS_IRQENABLE_CLR_0 0x0030
#define USBOTGSS_IRQ0_OFFSET 0x0004
#define USBOTGSS_IRQSTATUS_RAW_1 0x0030
#define USBOTGSS_IRQSTATUS_1 0x0034
#define USBOTGSS_IRQENABLE_SET_1 0x0038
#define USBOTGSS_IRQENABLE_CLR_1 0x003c
#define USBOTGSS_IRQSTATUS_RAW_2 0x0040
#define USBOTGSS_IRQSTATUS_2 0x0044
#define USBOTGSS_IRQENABLE_SET_2 0x0048
#define USBOTGSS_IRQENABLE_CLR_2 0x004c
#define USBOTGSS_IRQSTATUS_RAW_3 0x0050
#define USBOTGSS_IRQSTATUS_3 0x0054
#define USBOTGSS_IRQENABLE_SET_3 0x0058
#define USBOTGSS_IRQENABLE_CLR_3 0x005c
#define USBOTGSS_IRQSTATUS_EOI_MISC 0x0030
#define USBOTGSS_IRQSTATUS_RAW_MISC 0x0034
#define USBOTGSS_IRQSTATUS_MISC 0x0038
#define USBOTGSS_IRQENABLE_SET_MISC 0x003c
#define USBOTGSS_IRQENABLE_CLR_MISC 0x0040
#define USBOTGSS_IRQMISC_OFFSET 0x03fc
#define USBOTGSS_UTMI_OTG_CTRL 0x0080
#define USBOTGSS_UTMI_OTG_STATUS 0x0084
#define USBOTGSS_UTMI_OTG_OFFSET 0x0480
#define USBOTGSS_TXFIFO_DEPTH 0x0508
#define USBOTGSS_RXFIFO_DEPTH 0x050c
#define USBOTGSS_MMRAM_OFFSET 0x0100
#define USBOTGSS_FLADJ 0x0104
#define USBOTGSS_DEBUG_CFG 0x0108
#define USBOTGSS_DEBUG_DATA 0x010c
#define USBOTGSS_DEV_EBC_EN 0x0110
#define USBOTGSS_DEBUG_OFFSET 0x0600
/* SYSCONFIG REGISTER */
#define USBOTGSS_SYSCONFIG_DMADISABLE (1 << 16)
/* IRQ_EOI REGISTER */
#define USBOTGSS_IRQ_EOI_LINE_NUMBER (1 << 0)
/* IRQS0 BITS */
#define USBOTGSS_IRQO_COREIRQ_ST (1 << 0)
/* IRQMISC BITS */
#define USBOTGSS_IRQMISC_DMADISABLECLR (1 << 17)
#define USBOTGSS_IRQMISC_OEVT (1 << 16)
#define USBOTGSS_IRQMISC_DRVVBUS_RISE (1 << 13)
#define USBOTGSS_IRQMISC_CHRGVBUS_RISE (1 << 12)
#define USBOTGSS_IRQMISC_DISCHRGVBUS_RISE (1 << 11)
#define USBOTGSS_IRQMISC_IDPULLUP_RISE (1 << 8)
#define USBOTGSS_IRQMISC_DRVVBUS_FALL (1 << 5)
#define USBOTGSS_IRQMISC_CHRGVBUS_FALL (1 << 4)
#define USBOTGSS_IRQMISC_DISCHRGVBUS_FALL (1 << 3)
#define USBOTGSS_IRQMISC_IDPULLUP_FALL (1 << 0)
/* UTMI_OTG_CTRL REGISTER */
#define USBOTGSS_UTMI_OTG_CTRL_DRVVBUS (1 << 5)
#define USBOTGSS_UTMI_OTG_CTRL_CHRGVBUS (1 << 4)
#define USBOTGSS_UTMI_OTG_CTRL_DISCHRGVBUS (1 << 3)
#define USBOTGSS_UTMI_OTG_CTRL_IDPULLUP (1 << 0)
/* UTMI_OTG_STATUS REGISTER */
#define USBOTGSS_UTMI_OTG_STATUS_SW_MODE (1 << 31)
#define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT (1 << 9)
#define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE (1 << 8)
#define USBOTGSS_UTMI_OTG_STATUS_IDDIG (1 << 4)
#define USBOTGSS_UTMI_OTG_STATUS_SESSEND (1 << 3)
#define USBOTGSS_UTMI_OTG_STATUS_SESSVALID (1 << 2)
#define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID (1 << 1)
struct dwc3_omap {
struct device *dev;
void __iomem *base;
u32 utmi_otg_status;
u32 utmi_otg_offset;
u32 irqmisc_offset;
u32 irq_eoi_offset;
u32 debug_offset;
u32 irq0_offset;
u32 dma_status:1;
struct list_head list;
u32 index;
};
static LIST_HEAD(dwc3_omap_list);
static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
{
return readl(base + offset);
}
static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
{
writel(value, base + offset);
}
static u32 dwc3_omap_read_utmi_status(struct dwc3_omap *omap)
{
return dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS +
omap->utmi_otg_offset);
}
static void dwc3_omap_write_utmi_status(struct dwc3_omap *omap, u32 value)
{
dwc3_omap_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS +
omap->utmi_otg_offset, value);
}
static u32 dwc3_omap_read_irq0_status(struct dwc3_omap *omap)
{
return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_0 -
omap->irq0_offset);
}
static void dwc3_omap_write_irq0_status(struct dwc3_omap *omap, u32 value)
{
dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_0 -
omap->irq0_offset, value);
}
static u32 dwc3_omap_read_irqmisc_status(struct dwc3_omap *omap)
{
return dwc3_omap_readl(omap->base, USBOTGSS_IRQSTATUS_MISC +
omap->irqmisc_offset);
}
static void dwc3_omap_write_irqmisc_status(struct dwc3_omap *omap, u32 value)
{
dwc3_omap_writel(omap->base, USBOTGSS_IRQSTATUS_MISC +
omap->irqmisc_offset, value);
}
static void dwc3_omap_write_irqmisc_set(struct dwc3_omap *omap, u32 value)
{
dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_MISC +
omap->irqmisc_offset, value);
}
static void dwc3_omap_write_irq0_set(struct dwc3_omap *omap, u32 value)
{
dwc3_omap_writel(omap->base, USBOTGSS_IRQENABLE_SET_0 -
omap->irq0_offset, value);
}
static void dwc3_omap_set_mailbox(struct dwc3_omap *omap,
enum omap_dwc3_vbus_id_status status)
{
u32 val;
switch (status) {
case OMAP_DWC3_ID_GROUND:
dev_dbg(omap->dev, "ID GND\n");
val = dwc3_omap_read_utmi_status(omap);
val &= ~(USBOTGSS_UTMI_OTG_STATUS_IDDIG
| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
| USBOTGSS_UTMI_OTG_STATUS_SESSEND);
val |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID
| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
dwc3_omap_write_utmi_status(omap, val);
break;
case OMAP_DWC3_VBUS_VALID:
dev_dbg(omap->dev, "VBUS Connect\n");
val = dwc3_omap_read_utmi_status(omap);
val &= ~USBOTGSS_UTMI_OTG_STATUS_SESSEND;
val |= USBOTGSS_UTMI_OTG_STATUS_IDDIG
| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
| USBOTGSS_UTMI_OTG_STATUS_SESSVALID
| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
dwc3_omap_write_utmi_status(omap, val);
break;
case OMAP_DWC3_ID_FLOAT:
case OMAP_DWC3_VBUS_OFF:
dev_dbg(omap->dev, "VBUS Disconnect\n");
val = dwc3_omap_read_utmi_status(omap);
val &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSVALID
| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
| USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT);
val |= USBOTGSS_UTMI_OTG_STATUS_SESSEND
| USBOTGSS_UTMI_OTG_STATUS_IDDIG;
dwc3_omap_write_utmi_status(omap, val);
break;
default:
dev_dbg(omap->dev, "invalid state\n");
}
}
static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
{
struct dwc3_omap *omap = _omap;
u32 reg;
reg = dwc3_omap_read_irqmisc_status(omap);
if (reg & USBOTGSS_IRQMISC_DMADISABLECLR) {
dev_dbg(omap->dev, "DMA Disable was Cleared\n");
omap->dma_status = false;
}
if (reg & USBOTGSS_IRQMISC_OEVT)
dev_dbg(omap->dev, "OTG Event\n");
if (reg & USBOTGSS_IRQMISC_DRVVBUS_RISE)
dev_dbg(omap->dev, "DRVVBUS Rise\n");
if (reg & USBOTGSS_IRQMISC_CHRGVBUS_RISE)
dev_dbg(omap->dev, "CHRGVBUS Rise\n");
if (reg & USBOTGSS_IRQMISC_DISCHRGVBUS_RISE)
dev_dbg(omap->dev, "DISCHRGVBUS Rise\n");
if (reg & USBOTGSS_IRQMISC_IDPULLUP_RISE)
dev_dbg(omap->dev, "IDPULLUP Rise\n");
if (reg & USBOTGSS_IRQMISC_DRVVBUS_FALL)
dev_dbg(omap->dev, "DRVVBUS Fall\n");
if (reg & USBOTGSS_IRQMISC_CHRGVBUS_FALL)
dev_dbg(omap->dev, "CHRGVBUS Fall\n");
if (reg & USBOTGSS_IRQMISC_DISCHRGVBUS_FALL)
dev_dbg(omap->dev, "DISCHRGVBUS Fall\n");
if (reg & USBOTGSS_IRQMISC_IDPULLUP_FALL)
dev_dbg(omap->dev, "IDPULLUP Fall\n");
dwc3_omap_write_irqmisc_status(omap, reg);
reg = dwc3_omap_read_irq0_status(omap);
dwc3_omap_write_irq0_status(omap, reg);
return IRQ_HANDLED;
}
static void dwc3_omap_enable_irqs(struct dwc3_omap *omap)
{
u32 reg;
/* enable all IRQs */
reg = USBOTGSS_IRQO_COREIRQ_ST;
dwc3_omap_write_irq0_set(omap, reg);
reg = (USBOTGSS_IRQMISC_OEVT |
USBOTGSS_IRQMISC_DRVVBUS_RISE |
USBOTGSS_IRQMISC_CHRGVBUS_RISE |
USBOTGSS_IRQMISC_DISCHRGVBUS_RISE |
USBOTGSS_IRQMISC_IDPULLUP_RISE |
USBOTGSS_IRQMISC_DRVVBUS_FALL |
USBOTGSS_IRQMISC_CHRGVBUS_FALL |
USBOTGSS_IRQMISC_DISCHRGVBUS_FALL |
USBOTGSS_IRQMISC_IDPULLUP_FALL);
dwc3_omap_write_irqmisc_set(omap, reg);
}
static void dwc3_omap_disable_irqs(struct dwc3_omap *omap)
{
/* disable all IRQs */
dwc3_omap_write_irqmisc_set(omap, 0x00);
dwc3_omap_write_irq0_set(omap, 0x00);
}
static void dwc3_omap_map_offset(struct dwc3_omap *omap)
{
/*
* Differentiate between OMAP5 and AM437x.
*
* For OMAP5(ES2.0) and AM437x wrapper revision is same, even
* though there are changes in wrapper register offsets.
*
* Using dt compatible to differentiate AM437x.
*/
#ifdef CONFIG_AM43XX
omap->irq_eoi_offset = USBOTGSS_EOI_OFFSET;
omap->irq0_offset = USBOTGSS_IRQ0_OFFSET;
omap->irqmisc_offset = USBOTGSS_IRQMISC_OFFSET;
omap->utmi_otg_offset = USBOTGSS_UTMI_OTG_OFFSET;
omap->debug_offset = USBOTGSS_DEBUG_OFFSET;
#endif
}
static void dwc3_omap_set_utmi_mode(struct dwc3_omap *omap, int utmi_mode)
{
u32 reg;
reg = dwc3_omap_read_utmi_status(omap);
switch (utmi_mode) {
case DWC3_OMAP_UTMI_MODE_SW:
reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
break;
case DWC3_OMAP_UTMI_MODE_HW:
reg &= ~USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
break;
default:
dev_dbg(omap->dev, "UNKNOWN utmi mode %d\n", utmi_mode);
}
dwc3_omap_write_utmi_status(omap, reg);
}
/**
* dwc3_omap_uboot_init - dwc3 omap uboot initialization code
* @dev: struct dwc3_omap_device containing initialization data
*
* Entry point for dwc3 omap driver (equivalent to dwc3_omap_probe in linux
* kernel driver). Pointer to dwc3_omap_device should be passed containing
* base address and other initialization data. Returns '0' on success and
* a negative value on failure.
*
* Generally called from board_usb_init() implemented in board file.
*/
int dwc3_omap_uboot_init(struct dwc3_omap_device *omap_dev)
{
u32 reg;
struct device *dev;
struct dwc3_omap *omap;
omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
if (!omap)
return -ENOMEM;
omap->base = omap_dev->base;
omap->index = omap_dev->index;
dwc3_omap_map_offset(omap);
dwc3_omap_set_utmi_mode(omap, omap_dev->utmi_mode);
/* check the DMA Status */
reg = dwc3_omap_readl(omap->base, USBOTGSS_SYSCONFIG);
omap->dma_status = !!(reg & USBOTGSS_SYSCONFIG_DMADISABLE);
dwc3_omap_set_mailbox(omap, omap_dev->vbus_id_status);
dwc3_omap_enable_irqs(omap);
list_add_tail(&omap->list, &dwc3_omap_list);
return 0;
}
/**
* dwc3_omap_uboot_exit - dwc3 omap uboot cleanup code
* @index: index of this controller
*
* Performs cleanup of memory allocated in dwc3_omap_uboot_init
* (equivalent to dwc3_omap_remove in linux). index of _this_ controller
* should be passed and should match with the index passed in
* dwc3_omap_device during init.
*
* Generally called from board file.
*/
void dwc3_omap_uboot_exit(int index)
{
struct dwc3_omap *omap = NULL;
list_for_each_entry(omap, &dwc3_omap_list, list) {
if (omap->index != index)
continue;
dwc3_omap_disable_irqs(omap);
list_del(&omap->list);
kfree(omap);
break;
}
}
/**
* dwc3_omap_uboot_interrupt_status - check the status of interrupt
* @index: index of this controller
*
* Checks the status of interrupts and returns true if an interrupt
* is detected or false otherwise.
*
* Generally called from board file.
*/
int dwc3_omap_uboot_interrupt_status(int index)
{
struct dwc3_omap *omap = NULL;
list_for_each_entry(omap, &dwc3_omap_list, list)
if (omap->index == index)
return dwc3_omap_interrupt(-1, omap);
return 0;
}
MODULE_ALIAS("platform:omap-dwc3");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 OMAP Glue Layer");
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