usb.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/mmio.h>
#include <soc/usb/usb_common.h>
#include <soc/addressmap.h>
#include <soc/clock.h>
 
struct usb_dwc3 {
        u32 sbuscfg0;
        u32 sbuscfg1;
        u32 txthrcfg;
        u32 rxthrcfg;
        u32 ctl;
        u32 pmsts;
        u32 sts;
        u32 uctl1;
        u32 snpsid;
        u32 gpio;
        u32 uid;
        u32 uctl;
        u64 buserraddr;
        u64 prtbimap;
        u8 reserved1[32];
        u32 dbgfifospace;
        u32 dbgltssm;
        u32 dbglnmcc;
        u32 dbgbmu;
        u32 dbglspmux;
        u32 dbglsp;
        u32 dbgepinfo0;
        u32 dbgepinfo1;
        u64 prtbimap_hs;
        u64 prtbimap_fs;
        u8 reserved2[112];
        u32 usb2phycfg;
        u8 reserved3[124];
        u32 usb2phyacc;
        u8 reserved4[60];
        u32 usb3pipectl;
        u8 reserved5[60];
};
check_member(usb_dwc3, usb2phycfg, 0x100);
check_member(usb_dwc3, usb3pipectl, 0x1c0);
 
struct usb_dwc3_cfg {
        struct usb_dwc3 *usb_host_dwc3;
        u32 *usb3_bcr;
        u32 *qusb2phy_bcr;
        u32 *gcc_usb3phy_bcr_reg;
        u32 *gcc_qmpphy_bcr_reg;
};
 
static struct usb_dwc3_cfg usb_port0 = {
        .usb_host_dwc3 =        (void *)USB_HOST_DWC3_BASE,
        .usb3_bcr =             &gcc->usb30_prim_bcr,
        .qusb2phy_bcr =         &gcc->qusb2phy_prim_bcr,
        .gcc_usb3phy_bcr_reg =  &gcc->usb3_dp_phy_prim_bcr,
        .gcc_qmpphy_bcr_reg =   &gcc->usb3_phy_prim_bcr,
};
 
static void reset_usb(struct usb_dwc3_cfg *dwc3)
{
        /* Assert Core reset */
        clock_reset_bcr(dwc3->usb3_bcr, 1);
 
        /* Assert HS PHY reset */
        clock_reset_bcr(dwc3->qusb2phy_bcr, 1);
 
        /* Assert QMP PHY reset */
        clock_reset_bcr(dwc3->gcc_usb3phy_bcr_reg, 1);
        clock_reset_bcr(dwc3->gcc_qmpphy_bcr_reg, 1);
}
 
void reset_usb0(void)
{
        /* Before Resetting PHY, put Core in Reset */
        printk(BIOS_INFO, "Starting DWC3 and PHY resets for USB(0)\n");
 
        reset_usb(&usb_port0);
}
 
static void setup_dwc3(struct usb_dwc3 *dwc3)
{
        /* core exits U1/U2/U3 only in PHY power state P1/P2/P3 respectively */
        clrsetbits32(&dwc3->usb3pipectl,
                DWC3_GUSB3PIPECTL_DELAYP1TRANS,
                DWC3_GUSB3PIPECTL_UX_EXIT_IN_PX);
 
        /*
         * Configure USB phy interface of DWC3 core.
         * 1. Select UTMI+ PHY with 16-bit interface.
         * 2. Set USBTRDTIM to the corresponding value
         * according to the UTMI+ PHY interface.
         */
        clrsetbits32(&dwc3->usb2phycfg,
                        (DWC3_GUSB2PHYCFG_USB2TRDTIM_MASK |
                        DWC3_GUSB2PHYCFG_PHYIF_MASK),
                        (DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) |
                        DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT)));
 
        clrsetbits32(&dwc3->ctl, (DWC3_GCTL_SCALEDOWN_MASK |
                        DWC3_GCTL_DISSCRAMBLE),
                        DWC3_GCTL_U2EXIT_LFPS | DWC3_GCTL_DSBLCLKGTNG);
 
        /* configure controller in Host mode */
        clrsetbits32(&dwc3->ctl, (DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG)),
                        DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_HOST));
        printk(BIOS_SPEW, "Configure USB in Host mode\n");
}
 
/* Initialization of DWC3 Core and PHY */
 
static void setup_usb_host(struct usb_dwc3_cfg *dwc3,
                        void  *board_data)
{
         /* Clear core reset. */
        clock_reset_bcr(dwc3->usb3_bcr, 0);
 
        /* Clear QUSB PHY reset. */
        clock_reset_bcr(dwc3->qusb2phy_bcr, 0);
 
        /* Initialize HS PHY */
        hs_usb_phy_init(board_data);
 
        /* Clear QMP PHY resets. */
        clock_reset_bcr(dwc3->gcc_usb3phy_bcr_reg, 0);
        clock_reset_bcr(dwc3->gcc_qmpphy_bcr_reg, 0);
 
        /* Initialize QMP PHY */
        ss_qmp_phy_init();
 
        setup_dwc3(dwc3->usb_host_dwc3);
 
        printk(BIOS_INFO, "DWC3 and PHY setup finished\n");
}
void setup_usb_host0(void  *board_data)
{
        printk(BIOS_INFO, "Setting up USB HOST0 controller.\n");
        setup_usb_host(&usb_port0, board_data);
}