tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 attr = soc_device_match(rcar_quirks_match);
138 if (attr)
139 quirks = (uintptr_t)attr->data;
140
141 if (quirks & RCAR_XHCI_FIRMWARE_V2)
142 firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2;
143 else if (quirks & RCAR_XHCI_FIRMWARE_V3)
144 firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3;
145 else
146 firmware_name = priv->firmware_name;
147
148 /* request R-Car USB3.0 firmware */
149 retval = request_firmware(&fw, firmware_name, dev);
150 if (retval)
151 return retval;
152
153 /* download R-Car USB3.0 firmware */
154 temp = readl(regs + RCAR_USB3_DL_CTRL);
155 temp |= RCAR_USB3_DL_CTRL_ENABLE;
156 writel(temp, regs + RCAR_USB3_DL_CTRL);
157
158 for (index = 0; index < fw->size; index += 4) {
159 /* to avoid reading beyond the end of the buffer */
160 for (data = 0, j = 3; j >= 0; j--) {
161 if ((j + index) < fw->size)
162 data |= fw->data[index + j] << (8 * j);
163 }
164 writel(data, regs + RCAR_USB3_FW_DATA0);
165 temp = readl(regs + RCAR_USB3_DL_CTRL);
166 temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
167 writel(temp, regs + RCAR_USB3_DL_CTRL);
168
169 retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
170 val, !(val & RCAR_USB3_DL_CTRL_FW_SET_DATA0),
171 1, 10000);
172 if (retval < 0)
173 break;
174 }
175
176 temp = readl(regs + RCAR_USB3_DL_CTRL);
177 temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
178 writel(temp, regs + RCAR_USB3_DL_CTRL);
179
180 retval = readl_poll_timeout_atomic((regs + RCAR_USB3_DL_CTRL),
181 val, val & RCAR_USB3_DL_CTRL_FW_SUCCESS, 1, 10000);
182
183 release_firmware(fw);
184
185 return retval;
186}
187
188static bool xhci_rcar_wait_for_pll_active(struct usb_hcd *hcd)
189{
190 int retval;
191 u32 val, mask = RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK;
192
193 retval = readl_poll_timeout_atomic(hcd->regs + RCAR_USB3_AXH_STA,
194 val, (val & mask) == mask, 1, 1000);
195 return !retval;
196}
197
198/* This function needs to initialize a "phy" of usb before */
199int xhci_rcar_init_quirk(struct usb_hcd *hcd)
200{
201 /* If hcd->regs is NULL, we don't just call the following function */
202 if (!hcd->regs)
203 return 0;
204
205 if (!xhci_rcar_wait_for_pll_active(hcd))
206 return -ETIMEDOUT;
207
208 return xhci_rcar_download_firmware(hcd);
209}
210
211int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
212{
213 int ret;
214
215 ret = xhci_rcar_download_firmware(hcd);
216 if (!ret)
217 xhci_rcar_start(hcd);
218
219 return ret;
220}