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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Renesas USB driver R-Car Gen. 3 initialization and power control
- *
- * Copyright (C) 2016-2019 Renesas Electronics Corporation
- */
- #include <linux/delay.h>
- #include <linux/io.h>
- #include "common.h"
- #include "rcar3.h"
- #define LPSTS 0x102
- #define UGCTRL 0x180 /* 32-bit register */
- #define UGCTRL2 0x184 /* 32-bit register */
- #define UGSTS 0x188 /* 32-bit register */
- /* Low Power Status register (LPSTS) */
- #define LPSTS_SUSPM 0x4000
- /* R-Car D3 only: USB General control register (UGCTRL) */
- #define UGCTRL_PLLRESET 0x00000001
- #define UGCTRL_CONNECT 0x00000004
- /*
- * USB General control register 2 (UGCTRL2)
- * Remarks: bit[31:11] and bit[9:6] should be 0
- */
- #define UGCTRL2_RESERVED_3 0x00000001 /* bit[3:0] should be B'0001 */
- #define UGCTRL2_USB0SEL_HSUSB 0x00000020
- #define UGCTRL2_USB0SEL_OTG 0x00000030
- #define UGCTRL2_VBUSSEL 0x00000400
- /* R-Car D3 only: USB General status register (UGSTS) */
- #define UGSTS_LOCK 0x00000100
- static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
- {
- iowrite32(data, priv->base + reg);
- }
- static u32 usbhs_read32(struct usbhs_priv *priv, u32 reg)
- {
- return ioread32(priv->base + reg);
- }
- static void usbhs_rcar3_set_ugctrl2(struct usbhs_priv *priv, u32 val)
- {
- usbhs_write32(priv, UGCTRL2, val | UGCTRL2_RESERVED_3);
- }
- static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
- void __iomem *base, int enable)
- {
- struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
- usbhs_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_OTG | UGCTRL2_VBUSSEL);
- if (enable) {
- usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
- /* The controller on R-Car Gen3 needs to wait up to 45 usec */
- usleep_range(45, 90);
- } else {
- usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
- }
- return 0;
- }
- /* R-Car D3 needs to release UGCTRL.PLLRESET */
- static int usbhs_rcar3_power_and_pll_ctrl(struct platform_device *pdev,
- void __iomem *base, int enable)
- {
- struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
- u32 val;
- int timeout = 1000;
- if (enable) {
- usbhs_write32(priv, UGCTRL, 0); /* release PLLRESET */
- usbhs_rcar3_set_ugctrl2(priv,
- UGCTRL2_USB0SEL_OTG | UGCTRL2_VBUSSEL);
- usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
- do {
- val = usbhs_read32(priv, UGSTS);
- udelay(1);
- } while (!(val & UGSTS_LOCK) && timeout--);
- usbhs_write32(priv, UGCTRL, UGCTRL_CONNECT);
- } else {
- usbhs_write32(priv, UGCTRL, 0);
- usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
- usbhs_write32(priv, UGCTRL, UGCTRL_PLLRESET);
- }
- return 0;
- }
- const struct renesas_usbhs_platform_info usbhs_rcar_gen3_plat_info = {
- .platform_callback = {
- .power_ctrl = usbhs_rcar3_power_ctrl,
- .get_id = usbhs_get_id_as_gadget,
- },
- .driver_param = {
- .has_usb_dmac = 1,
- .multi_clks = 1,
- .has_new_pipe_configs = 1,
- },
- };
- const struct renesas_usbhs_platform_info usbhs_rcar_gen3_with_pll_plat_info = {
- .platform_callback = {
- .power_ctrl = usbhs_rcar3_power_and_pll_ctrl,
- .get_id = usbhs_get_id_as_gadget,
- },
- .driver_param = {
- .has_usb_dmac = 1,
- .multi_clks = 1,
- .has_new_pipe_configs = 1,
- },
- };
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