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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/mmio.h>
#include <console/console.h>
#include <delay.h>
#include <device/device.h>
#include <soc/gpio.h>
#include <soc/power.h>
#include <soc/sysreg.h>
#include <soc/usb.h>
static void reset_dwc3(struct exynos5_usb_drd_dwc3 *dwc3)
{
setbits32(&dwc3->ctl, 0x1 << 11); /* core soft reset */
setbits32(&dwc3->usb3pipectl, 0x1 << 31); /* PHY soft reset */
setbits32(&dwc3->usb2phycfg, 0x1 << 31); /* PHY soft reset */
}
void reset_usb_drd_dwc3(void)
{
printk(BIOS_DEBUG, "Starting DWC3 reset for USB DRD\n");
reset_dwc3(exynos_usb_drd_dwc3);
}
static void setup_dwc3(struct exynos5_usb_drd_dwc3 *dwc3)
{
if (!(dwc3->ctl & 0x1 << 11) ||
!(dwc3->usb3pipectl & 0x1 << 31) ||
!(dwc3->usb2phycfg & 0x1 << 31)) {
printk(BIOS_ERR, "DWC3 at %p not in reset (you need to call "
"reset_usb_drd_dwc3() first)!\n", dwc3);
}
/* Set relevant registers to default values (clearing all reset bits) */
write32(&dwc3->usb3pipectl,
0x1 << 24 | /* activate PHY low power states */
0x4 << 19 | /* low power delay value */
0x1 << 18 | /* activate PHY low power delay */
0x1 << 17 | /* enable SuperSpeed PHY suspend */
0x1 << 1); /* default Tx deemphasis value */
/* Configure PHY clock turnaround for 8-bit UTMI+, disable suspend */
write32(&dwc3->usb2phycfg,
0x9 << 10 | /* PHY clock turnaround for 8-bit UTMI+ */
0x1 << 8 | /* enable PHY sleep in L1 */
0x1 << 6); /* enable PHY suspend */
write32(&dwc3->ctl,
0x5dc << 19 | /* suspend clock scale for 24MHz */
0x1 << 16 | /* retry SS three times (bugfix from U-Boot) */
0x1 << 12); /* port capability HOST */
}
void setup_usb_drd_dwc3(void)
{
setup_dwc3(exynos_usb_drd_dwc3);
printk(BIOS_DEBUG, "DWC3 setup for USB DRD finished\n");
}
static void setup_drd_phy(struct exynos5_usb_drd_phy *phy)
{
/* Set all PHY registers to default values */
/* XHCI Version 1.0, Frame Length adjustment 30 MHz */
setbits32(&phy->linksystem, 0x1 << 27 | 0x20 << 1);
/* Disable OTG, ID0 and DRVVBUS, do not force sleep/suspend */
write32(&phy->utmi, 1 << 6);
write32(&phy->clkrst,
0x88 << 23 | /* spread spectrum refclk selector */
0x1 << 20 | /* enable spread spectrum */
0x1 << 19 | /* enable prescaler refclk */
0x68 << 11 | /* multiplier for 24MHz refclk */
0x5 << 5 | /* select 24MHz refclk (weird, from U-Boot) */
0x1 << 4 | /* power supply in normal operating mode */
0x3 << 2 | /* use external refclk (undocumented on 5420?)*/
0x1 << 1 | /* force port reset */
0x1 << 0); /* normal operating mode */
write32(&phy->param0,
0x9 << 26 | /* LOS level */
0x3 << 22 | /* TX VREF tune */
0x1 << 20 | /* TX rise tune */
0x1 << 18 | /* TX res tune */
0x3 << 13 | /* TX HS X Vtune */
0x3 << 9 | /* TX FS/LS tune */
0x3 << 6 | /* SQRX tune */
0x4 << 3 | /* OTG tune */
0x4 << 0); /* comp disc tune */
write32(&phy->param1,
0x7f << 19 | /* reserved */
0x7f << 12 | /* Tx launch amplitude */
0x20 << 6 | /* Tx deemphasis 6dB */
0x1c << 0); /* Tx deemphasis 3.5dB (value from U-Boot) */
/* disable all test features */
write32(&phy->test, 0);
/* UTMI clock select? ("must be 0x1") */
write32(&phy->utmiclksel, 0x1 << 2);
/* Samsung magic, undocumented (from U-Boot) */
write32(&phy->resume, 0x0);
udelay(10);
clrbits32(&phy->clkrst, 0x1 << 1); /* deassert port reset */
}
void setup_usb_drd_phy(void)
{
printk(BIOS_DEBUG, "Powering up USB DRD PHY\n");
setbits32(&exynos_power->usb_drd_phy_ctrl, POWER_USB_PHY_CTRL_EN);
setup_drd_phy(exynos_usb_drd_phy);
}
void setup_usb_host_phy(int hsic_gpio)
{
unsigned int hostphy_ctrl0;
setbits32(&exynos_sysreg->usb20_phy_cfg, USB20_PHY_CFG_EN);
setbits32(&exynos_power->usb_host_phy_ctrl, POWER_USB_PHY_CTRL_EN);
printk(BIOS_DEBUG, "Powering up USB HOST PHY (%s HSIC)\n",
hsic_gpio ? "with" : "without");
hostphy_ctrl0 = read32(&exynos_usb_host_phy->usbphyctrl0);
hostphy_ctrl0 &= ~(HOST_CTRL0_FSEL_MASK |
HOST_CTRL0_COMMONON_N |
/* HOST Phy setting */
HOST_CTRL0_PHYSWRST |
HOST_CTRL0_PHYSWRSTALL |
HOST_CTRL0_SIDDQ |
HOST_CTRL0_FORCESUSPEND |
HOST_CTRL0_FORCESLEEP);
hostphy_ctrl0 |= (/* Setting up the ref freq */
CLK_24MHZ << 16 |
/* HOST Phy setting */
HOST_CTRL0_LINKSWRST |
HOST_CTRL0_UTMISWRST);
write32(&exynos_usb_host_phy->usbphyctrl0, hostphy_ctrl0);
udelay(10);
clrbits32(&exynos_usb_host_phy->usbphyctrl0,
HOST_CTRL0_LINKSWRST |
HOST_CTRL0_UTMISWRST);
udelay(20);
/* EHCI Ctrl setting */
setbits32(&exynos_usb_host_phy->ehcictrl,
EHCICTRL_ENAINCRXALIGN |
EHCICTRL_ENAINCR4 |
EHCICTRL_ENAINCR8 |
EHCICTRL_ENAINCR16);
/* HSIC USB Hub initialization. */
if (hsic_gpio) {
gpio_direction_output(hsic_gpio, 0);
udelay(100);
gpio_direction_output(hsic_gpio, 1);
udelay(5000);
clrbits32(&exynos_usb_host_phy->hsicphyctrl1,
HOST_CTRL0_SIDDQ |
HOST_CTRL0_FORCESLEEP |
HOST_CTRL0_FORCESUSPEND);
setbits32(&exynos_usb_host_phy->hsicphyctrl1,
HOST_CTRL0_PHYSWRST);
udelay(10);
clrbits32(&exynos_usb_host_phy->hsicphyctrl1,
HOST_CTRL0_PHYSWRST);
}
/* At this point we need to wait for 50ms before talking to
* the USB controller (PHY clock and power setup time)
* By the time we are actually in the payload, these 50ms
* will have passed.
*/
}
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