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- // SPDX-License-Identifier: GPL-2.0
- /**
- * cdns_ti-ti.c - TI specific Glue layer for Cadence USB Controller
- *
- * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
- */
- #include <common.h>
- #include <asm-generic/io.h>
- #include <clk.h>
- #include <dm.h>
- #include <dm/device_compat.h>
- #include <linux/bitops.h>
- #include <linux/io.h>
- #include <linux/usb/otg.h>
- #include <malloc.h>
- #include "core.h"
- /* USB Wrapper register offsets */
- #define USBSS_PID 0x0
- #define USBSS_W1 0x4
- #define USBSS_STATIC_CONFIG 0x8
- #define USBSS_PHY_TEST 0xc
- #define USBSS_DEBUG_CTRL 0x10
- #define USBSS_DEBUG_INFO 0x14
- #define USBSS_DEBUG_LINK_STATE 0x18
- #define USBSS_DEVICE_CTRL 0x1c
- /* Wrapper 1 register bits */
- #define USBSS_W1_PWRUP_RST BIT(0)
- #define USBSS_W1_OVERCURRENT_SEL BIT(8)
- #define USBSS_W1_MODESTRAP_SEL BIT(9)
- #define USBSS_W1_OVERCURRENT BIT(16)
- #define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17)
- #define USBSS_W1_MODESTRAP_SHIFT 17
- #define USBSS_W1_USB2_ONLY BIT(19)
- /* Static config register bits */
- #define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5)
- #define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5
- #define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3)
- #define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3
- #define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1)
- #define USBSS1_STATIC_VBUS_SEL_SHIFT 1
- #define USBSS1_STATIC_LANE_REVERSE BIT(0)
- /* Modestrap modes */
- enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE,
- USBSS_MODESTRAP_MODE_HOST,
- USBSS_MODESTRAP_MODE_PERIPHERAL};
- struct cdns_ti {
- struct udevice *dev;
- void __iomem *usbss;
- int usb2_only:1;
- int vbus_divider:1;
- struct clk *usb2_refclk;
- struct clk *lpm_clk;
- };
- static const int cdns_ti_rate_table[] = { /* in KHZ */
- 9600,
- 10000,
- 12000,
- 19200,
- 20000,
- 24000,
- 25000,
- 26000,
- 38400,
- 40000,
- 58000,
- 50000,
- 52000,
- };
- static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset)
- {
- return readl(data->usbss + offset);
- }
- static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
- {
- writel(value, data->usbss + offset);
- }
- static int cdns_ti_probe(struct udevice *dev)
- {
- struct cdns_ti *data = dev_get_plat(dev);
- struct clk usb2_refclk;
- int modestrap_mode;
- unsigned long rate;
- int rate_code, i;
- u32 reg;
- int ret;
- data->dev = dev;
- data->usbss = dev_remap_addr_index(dev, 0);
- if (!data->usbss)
- return -EINVAL;
- ret = clk_get_by_name(dev, "ref", &usb2_refclk);
- if (ret) {
- dev_err(dev, "Failed to get usb2_refclk\n");
- return ret;
- }
- rate = clk_get_rate(&usb2_refclk);
- rate /= 1000; /* To KHz */
- for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) {
- if (cdns_ti_rate_table[i] == rate)
- break;
- }
- if (i == ARRAY_SIZE(cdns_ti_rate_table)) {
- dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
- return -EINVAL;
- }
- rate_code = i;
- /* assert RESET */
- reg = cdns_ti_readl(data, USBSS_W1);
- reg &= ~USBSS_W1_PWRUP_RST;
- cdns_ti_writel(data, USBSS_W1, reg);
- /* set static config */
- reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
- reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK;
- reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT;
- reg &= ~USBSS1_STATIC_VBUS_SEL_MASK;
- data->vbus_divider = dev_read_bool(dev, "ti,vbus-divider");
- if (data->vbus_divider)
- reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT;
- cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg);
- reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
- /* set USB2_ONLY mode if requested */
- reg = cdns_ti_readl(data, USBSS_W1);
- data->usb2_only = dev_read_bool(dev, "ti,usb2-only");
- if (data->usb2_only)
- reg |= USBSS_W1_USB2_ONLY;
- /* set modestrap */
- if (dev_read_bool(dev, "ti,modestrap-host"))
- modestrap_mode = USBSS_MODESTRAP_MODE_HOST;
- else if (dev_read_bool(dev, "ti,modestrap-peripheral"))
- modestrap_mode = USBSS_MODESTRAP_MODE_PERIPHERAL;
- else
- modestrap_mode = USBSS_MODESTRAP_MODE_NONE;
- reg |= USBSS_W1_MODESTRAP_SEL;
- reg &= ~USBSS_W1_MODESTRAP_MASK;
- reg |= modestrap_mode << USBSS_W1_MODESTRAP_SHIFT;
- cdns_ti_writel(data, USBSS_W1, reg);
- /* de-assert RESET */
- reg |= USBSS_W1_PWRUP_RST;
- cdns_ti_writel(data, USBSS_W1, reg);
- return 0;
- }
- static int cdns_ti_remove(struct udevice *dev)
- {
- struct cdns_ti *data = dev_get_plat(dev);
- u32 reg;
- /* put device back to RESET*/
- reg = cdns_ti_readl(data, USBSS_W1);
- reg &= ~USBSS_W1_PWRUP_RST;
- cdns_ti_writel(data, USBSS_W1, reg);
- return 0;
- }
- static const struct udevice_id cdns_ti_of_match[] = {
- { .compatible = "ti,j721e-usb", },
- {},
- };
- U_BOOT_DRIVER(cdns_ti) = {
- .name = "cdns-ti",
- .id = UCLASS_NOP,
- .of_match = cdns_ti_of_match,
- .bind = cdns3_bind,
- .probe = cdns_ti_probe,
- .remove = cdns_ti_remove,
- .plat_auto = sizeof(struct cdns_ti),
- .flags = DM_FLAG_OS_PREPARE,
- };
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