diff options
Diffstat (limited to 'src/soc/samsung/exynos5420/usb.c')
| -rw-r--r-- | src/soc/samsung/exynos5420/usb.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/soc/samsung/exynos5420/usb.c b/src/soc/samsung/exynos5420/usb.c new file mode 100644 index 0000000000..84a6f4ca4c --- /dev/null +++ b/src/soc/samsung/exynos5420/usb.c @@ -0,0 +1,217 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 Samsung Electronics + * Copyright 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <delay.h> +#include <arch/io.h> +#include <console/console.h> +#include <device/device.h> +#include "gpio.h" +#include "power.h" +#include "sysreg.h" +#include "usb.h" + +static void reset_dwc3(struct exynos5_usb_drd_dwc3 *dwc3) +{ + setbits_le32(&dwc3->ctl, 0x1 << 11); /* core soft reset */ + setbits_le32(&dwc3->usb3pipectl, 0x1 << 31); /* PHY soft reset */ + setbits_le32(&dwc3->usb2phycfg, 0x1 << 31); /* PHY soft reset */ +} + +void reset_usb_drd0_dwc3() +{ + printk(BIOS_DEBUG, "Starting DWC3 reset for USB DRD0\n"); + reset_dwc3(exynos_usb_drd0_dwc3); +} + +void reset_usb_drd1_dwc3() +{ + printk(BIOS_DEBUG, "Starting DWC3 reset for USB DRD1\n"); + reset_dwc3(exynos_usb_drd1_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_drdX_dwc3() first)!\n", dwc3); + } + + /* Set relevant registers to default values (clearing all reset bits) */ + + writel(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 */ + 0, &dwc3->usb3pipectl); + + /* Configure PHY clock turnaround for 8-bit UTMI+, disable suspend */ + writel(0x9 << 10 | /* PHY clock turnaround for 8-bit UTMI+ */ + 0x1 << 8 | /* enable PHY sleep in L1 */ + 0x1 << 6 | /* enable PHY suspend */ + 0, &dwc3->usb2phycfg); + + writel(0x5dc << 19 | /* suspend clock scale for 24MHz */ + 0x1 << 16 | /* retry SS three times (bugfix from U-Boot) */ + 0x1 << 12 | /* port capability HOST */ + 0, &dwc3->ctl); +} + +void setup_usb_drd0_dwc3() +{ + setup_dwc3(exynos_usb_drd0_dwc3); + printk(BIOS_DEBUG, "DWC3 setup for USB DRD0 finished\n"); +} + +void setup_usb_drd1_dwc3() +{ + setup_dwc3(exynos_usb_drd1_dwc3); + printk(BIOS_DEBUG, "DWC3 setup for USB DRD1 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 */ + setbits_le32(&phy->linksystem, 0x1 << 27 | 0x20 << 1); + + /* Disable OTG, ID0 and DRVVBUS, do not force sleep/suspend */ + writel(1 << 6, &phy->utmi); + + writel(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 */ + 0, &phy->clkrst); + + writel(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 */ + 0, &phy->param0); + + writel(0x7f << 19 | /* reserved */ + 0x7f << 12 | /* Tx launch amplitude */ + 0x20 << 6 | /* Tx deemphasis 6dB */ + 0x1c << 0 | /* Tx deemphasis 3.5dB (value from U-Boot) */ + 0, &phy->param1); + + /* disable all test features */ + writel(0, &phy->test); + + /* UTMI clock select? ("must be 0x1") */ + writel(0x1 << 2, &phy->utmiclksel); + + /* Samsung magic, undocumented (from U-Boot) */ + writel(0x0, &phy->resume); + + udelay(10); + clrbits_le32(&phy->clkrst, 0x1 << 1); /* deassert port reset */ +} + +void setup_usb_drd0_phy() +{ + printk(BIOS_DEBUG, "Powering up USB DRD0 PHY\n"); + setbits_le32(&exynos_power->usb_drd0_phy_ctrl, POWER_USB_PHY_CTRL_EN); + setup_drd_phy(exynos_usb_drd0_phy); +} + +void setup_usb_drd1_phy() +{ + printk(BIOS_DEBUG, "Powering up USB DRD1 PHY\n"); + setbits_le32(&exynos_power->usb_drd1_phy_ctrl, POWER_USB_PHY_CTRL_EN); + setup_drd_phy(exynos_usb_drd1_phy); +} + +void setup_usb_host_phy(int hsic_gpio) +{ + unsigned int hostphy_ctrl0; + + setbits_le32(&exynos_sysreg->usb20_phy_cfg, USB20_PHY_CFG_EN); + setbits_le32(&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 = readl(&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); + writel(hostphy_ctrl0, &exynos_usb_host_phy->usbphyctrl0); + udelay(10); + clrbits_le32(&exynos_usb_host_phy->usbphyctrl0, + HOST_CTRL0_LINKSWRST | + HOST_CTRL0_UTMISWRST); + udelay(20); + + /* EHCI Ctrl setting */ + setbits_le32(&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); + + clrbits_le32(&exynos_usb_host_phy->hsicphyctrl1, + HOST_CTRL0_SIDDQ | + HOST_CTRL0_FORCESLEEP | + HOST_CTRL0_FORCESUSPEND); + setbits_le32(&exynos_usb_host_phy->hsicphyctrl1, + HOST_CTRL0_PHYSWRST); + udelay(10); + clrbits_le32(&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. + */ +} |