usb.c

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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.
         */
}