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  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * xHCI host controller driver for R-Car SoCs
  4 *
  5 * Copyright (C) 2014 Renesas Electronics Corporation
  6 */
  7
  8#include <linux/firmware.h>
  9#include <linux/iopoll.h>
 10#include <linux/module.h>
 11#include <linux/platform_device.h>
 12#include <linux/of.h>
 13#include <linux/usb/phy.h>
 14#include <linux/sys_soc.h>
 15
 16#include "xhci.h"
 17#include "xhci-plat.h"
 18#include "xhci-rcar.h"
 19
 20/*
 21* - The V3 firmware is for almost all R-Car Gen3 (except r8a7795 ES1.x)
 22* - The V2 firmware is for r8a7795 ES1.x.
 23* - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
 24*   performance degradation. So, this driver continues to use the V1 if R-Car
 25*   Gen2.
 26* - The V1 firmware is impossible to use on R-Car Gen3.
 27*/
 28MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
 29MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
 30MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V3);
 31
 32/*** Register Offset ***/
 33#define RCAR_USB3_AXH_STA	0x104	/* AXI Host Control Status */
 34#define RCAR_USB3_INT_ENA	0x224	/* Interrupt Enable */
 35#define RCAR_USB3_DL_CTRL	0x250	/* FW Download Control & Status */
 36#define RCAR_USB3_FW_DATA0	0x258	/* FW Data0 */
 37
 38#define RCAR_USB3_LCLK		0xa44	/* LCLK Select */
 39#define RCAR_USB3_CONF1		0xa48	/* USB3.0 Configuration1 */
 40#define RCAR_USB3_CONF2		0xa5c	/* USB3.0 Configuration2 */
 41#define RCAR_USB3_CONF3		0xaa8	/* USB3.0 Configuration3 */
 42#define RCAR_USB3_RX_POL	0xab0	/* USB3.0 RX Polarity */
 43#define RCAR_USB3_TX_POL	0xab8	/* USB3.0 TX Polarity */
 44
 45/*** Register Settings ***/
 46/* AXI Host Control Status */
 47#define RCAR_USB3_AXH_STA_B3_PLL_ACTIVE		0x00010000
 48#define RCAR_USB3_AXH_STA_B2_PLL_ACTIVE		0x00000001
 49#define RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK (RCAR_USB3_AXH_STA_B3_PLL_ACTIVE | \
 50					   RCAR_USB3_AXH_STA_B2_PLL_ACTIVE)
 51
 52/* Interrupt Enable */
 53#define RCAR_USB3_INT_XHC_ENA	0x00000001
 54#define RCAR_USB3_INT_PME_ENA	0x00000002
 55#define RCAR_USB3_INT_HSE_ENA	0x00000004
 56#define RCAR_USB3_INT_ENA_VAL	(RCAR_USB3_INT_XHC_ENA | \
 57				RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
 58
 59/* FW Download Control & Status */
 60#define RCAR_USB3_DL_CTRL_ENABLE	0x00000001
 61#define RCAR_USB3_DL_CTRL_FW_SUCCESS	0x00000010
 62#define RCAR_USB3_DL_CTRL_FW_SET_DATA0	0x00000100
 63
 64/* LCLK Select */
 65#define RCAR_USB3_LCLK_ENA_VAL	0x01030001
 66
 67/* USB3.0 Configuration */
 68#define RCAR_USB3_CONF1_VAL	0x00030204
 69#define RCAR_USB3_CONF2_VAL	0x00030300
 70#define RCAR_USB3_CONF3_VAL	0x13802007
 71
 72/* USB3.0 Polarity */
 73#define RCAR_USB3_RX_POL_VAL	BIT(21)
 74#define RCAR_USB3_TX_POL_VAL	BIT(4)
 75
 76/* For soc_device_attribute */
 77#define RCAR_XHCI_FIRMWARE_V2   BIT(0) /* FIRMWARE V2 */
 78#define RCAR_XHCI_FIRMWARE_V3   BIT(1) /* FIRMWARE V3 */
 79
 80static const struct soc_device_attribute rcar_quirks_match[]  = {
 81	{
 82		.soc_id = "r8a7795", .revision = "ES1.*",
 83		.data = (void *)RCAR_XHCI_FIRMWARE_V2,
 84	},
 85	{ /* sentinel */ }
 86};
 87
 88static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
 89{
 90	/* LCLK Select */
 91	writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
 92	/* USB3.0 Configuration */
 93	writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
 94	writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
 95	writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
 96	/* USB3.0 Polarity */
 97	writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
 98	writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
 99}
100
101static int xhci_rcar_is_gen2(struct device *dev)
102{
103	struct device_node *node = dev->of_node;
104
105	return of_device_is_compatible(node, "renesas,xhci-r8a7790") ||
106		of_device_is_compatible(node, "renesas,xhci-r8a7791") ||
107		of_device_is_compatible(node, "renesas,xhci-r8a7793") ||
108		of_device_is_compatible(node, "renesas,rcar-gen2-xhci");
109}
110
111void xhci_rcar_start(struct usb_hcd *hcd)
112{
113	u32 temp;
114
115	if (hcd->regs != NULL) {
116		/* Interrupt Enable */
117		temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
118		temp |= RCAR_USB3_INT_ENA_VAL;
119		writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
120		if (xhci_rcar_is_gen2(hcd->self.controller))
121			xhci_rcar_start_gen2(hcd);
122	}
123}
124
125static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
126{
127	struct device *dev = hcd->self.controller;
128	void __iomem *regs = hcd->regs;
129	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
130	const struct firmware *fw;
131	int retval, index, j;
132	u32 data, val, temp;
133	u32 quirks = 0;
134	const struct soc_device_attribute *attr;
135	const char *firmware_name;
136
137	/*
138	 * According to the datasheet, "Upon the completion of FW Download,
139	 * there is no need to write or reload FW".
140	 */
141	if (readl(regs + RCAR_USB3_DL_CTRL) & RCAR_USB3_DL_CTRL_FW_SUCCESS)
142		return 0;
143
144	attr = soc_device_match(rcar_quirks_match);
145	if (attr)
146		quirks = (uintptr_t)attr->data;
147
148	if (quirks & RCAR_XHCI_FIRMWARE_V2)
149		firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2;
150	else if (quirks & RCAR_XHCI_FIRMWARE_V3)
151		firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3;
152	else
153		firmware_name = priv->firmware_name;
154
155	/* request R-Car USB3.0 firmware */
156	retval = request_firmware(&fw, firmware_name, dev);
157	if (retval)
158		return retval;
159
160	/* download R-Car USB3.0 firmware */
161	temp = readl(regs + RCAR_USB3_DL_CTRL);
162	temp |= RCAR_USB3_DL_CTRL_ENABLE;
163	writel(temp, regs + RCAR_USB3_DL_CTRL);
164
165	for (index = 0; index < fw->size; index += 4) {
166		/* to avoid reading beyond the end of the buffer */
167		for (data = 0, j = 3; j >= 0; j--) {
168			if ((j + index) < fw->size)
169				data |= fw->data[index + j] << (8 * j);
170		}
171		writel(data, regs + RCAR_USB3_FW_DATA0);
172		temp = readl(regs + RCAR_USB3_DL_CTRL);
173		temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
174		writel(temp, regs + RCAR_USB3_DL_CTRL);
175
176		retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
177				val, !(val & RCAR_USB3_DL_CTRL_FW_SET_DATA0),
178				1, 10000);
179		if (retval < 0)
180			break;
181	}
182
183	temp = readl(regs + RCAR_USB3_DL_CTRL);
184	temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
185	writel(temp, regs + RCAR_USB3_DL_CTRL);
186
187	retval = readl_poll_timeout_atomic((regs + RCAR_USB3_DL_CTRL),
188			val, val & RCAR_USB3_DL_CTRL_FW_SUCCESS, 1, 10000);
189
190	release_firmware(fw);
191
192	return retval;
193}
194
195static bool xhci_rcar_wait_for_pll_active(struct usb_hcd *hcd)
196{
197	int retval;
198	u32 val, mask = RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK;
199
200	retval = readl_poll_timeout_atomic(hcd->regs + RCAR_USB3_AXH_STA,
201			val, (val & mask) == mask, 1, 1000);
202	return !retval;
203}
204
205/* This function needs to initialize a "phy" of usb before */
206int xhci_rcar_init_quirk(struct usb_hcd *hcd)
207{
208	/* If hcd->regs is NULL, we don't just call the following function */
209	if (!hcd->regs)
210		return 0;
211
212	if (!xhci_rcar_wait_for_pll_active(hcd))
213		return -ETIMEDOUT;
214
215	return xhci_rcar_download_firmware(hcd);
216}
217
218int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
219{
220	int ret;
221
222	ret = xhci_rcar_download_firmware(hcd);
223	if (!ret)
224		xhci_rcar_start(hcd);
225
226	return ret;
227}