tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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/module.h>
10#include <linux/platform_device.h>
11#include <linux/of.h>
12#include <linux/usb/phy.h>
13#include <linux/sys_soc.h>
14
15#include "xhci.h"
16#include "xhci-plat.h"
17#include "xhci-rcar.h"
18
19/*
20* - The V3 firmware is for r8a7796 (with good performance) and r8a7795 es2.0
21* or later.
22* - The V2 firmware can be used on both r8a7795 (es1.x) and r8a7796.
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_INT_ENA 0x224 /* Interrupt Enable */
34#define RCAR_USB3_DL_CTRL 0x250 /* FW Download Control & Status */
35#define RCAR_USB3_FW_DATA0 0x258 /* FW Data0 */
36
37#define RCAR_USB3_LCLK 0xa44 /* LCLK Select */
38#define RCAR_USB3_CONF1 0xa48 /* USB3.0 Configuration1 */
39#define RCAR_USB3_CONF2 0xa5c /* USB3.0 Configuration2 */
40#define RCAR_USB3_CONF3 0xaa8 /* USB3.0 Configuration3 */
41#define RCAR_USB3_RX_POL 0xab0 /* USB3.0 RX Polarity */
42#define RCAR_USB3_TX_POL 0xab8 /* USB3.0 TX Polarity */
43
44/*** Register Settings ***/
45/* Interrupt Enable */
46#define RCAR_USB3_INT_XHC_ENA 0x00000001
47#define RCAR_USB3_INT_PME_ENA 0x00000002
48#define RCAR_USB3_INT_HSE_ENA 0x00000004
49#define RCAR_USB3_INT_ENA_VAL (RCAR_USB3_INT_XHC_ENA | \
50 RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
51
52/* FW Download Control & Status */
53#define RCAR_USB3_DL_CTRL_ENABLE 0x00000001
54#define RCAR_USB3_DL_CTRL_FW_SUCCESS 0x00000010
55#define RCAR_USB3_DL_CTRL_FW_SET_DATA0 0x00000100
56
57/* LCLK Select */
58#define RCAR_USB3_LCLK_ENA_VAL 0x01030001
59
60/* USB3.0 Configuration */
61#define RCAR_USB3_CONF1_VAL 0x00030204
62#define RCAR_USB3_CONF2_VAL 0x00030300
63#define RCAR_USB3_CONF3_VAL 0x13802007
64
65/* USB3.0 Polarity */
66#define RCAR_USB3_RX_POL_VAL BIT(21)
67#define RCAR_USB3_TX_POL_VAL BIT(4)
68
69/* For soc_device_attribute */
70#define RCAR_XHCI_FIRMWARE_V2 BIT(0) /* FIRMWARE V2 */
71#define RCAR_XHCI_FIRMWARE_V3 BIT(1) /* FIRMWARE V3 */
72
73static const struct soc_device_attribute rcar_quirks_match[] = {
74 {
75 .soc_id = "r8a7795", .revision = "ES1.*",
76 .data = (void *)RCAR_XHCI_FIRMWARE_V2,
77 },
78 {
79 .soc_id = "r8a7795",
80 .data = (void *)RCAR_XHCI_FIRMWARE_V3,
81 },
82 {
83 .soc_id = "r8a7796",
84 .data = (void *)RCAR_XHCI_FIRMWARE_V3,
85 },
86 {
87 .soc_id = "r8a77965",
88 .data = (void *)RCAR_XHCI_FIRMWARE_V3,
89 },
90 { /* sentinel */ },
91};
92
93static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
94{
95 /* LCLK Select */
96 writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
97 /* USB3.0 Configuration */
98 writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
99 writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
100 writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
101 /* USB3.0 Polarity */
102 writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
103 writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
104}
105
106static int xhci_rcar_is_gen2(struct device *dev)
107{
108 struct device_node *node = dev->of_node;
109
110 return of_device_is_compatible(node, "renesas,xhci-r8a7790") ||
111 of_device_is_compatible(node, "renesas,xhci-r8a7791") ||
112 of_device_is_compatible(node, "renesas,xhci-r8a7793") ||
113 of_device_is_compatible(node, "renensas,rcar-gen2-xhci");
114}
115
116static int xhci_rcar_is_gen3(struct device *dev)
117{
118 struct device_node *node = dev->of_node;
119
120 return of_device_is_compatible(node, "renesas,xhci-r8a7795") ||
121 of_device_is_compatible(node, "renesas,xhci-r8a7796") ||
122 of_device_is_compatible(node, "renesas,rcar-gen3-xhci");
123}
124
125void xhci_rcar_start(struct usb_hcd *hcd)
126{
127 u32 temp;
128
129 if (hcd->regs != NULL) {
130 /* Interrupt Enable */
131 temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
132 temp |= RCAR_USB3_INT_ENA_VAL;
133 writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
134 if (xhci_rcar_is_gen2(hcd->self.controller))
135 xhci_rcar_start_gen2(hcd);
136 }
137}
138
139static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
140{
141 struct device *dev = hcd->self.controller;
142 void __iomem *regs = hcd->regs;
143 struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
144 const struct firmware *fw;
145 int retval, index, j, time;
146 int timeout = 10000;
147 u32 data, val, temp;
148 u32 quirks = 0;
149 const struct soc_device_attribute *attr;
150 const char *firmware_name;
151
152 attr = soc_device_match(rcar_quirks_match);
153 if (attr)
154 quirks = (uintptr_t)attr->data;
155
156 if (quirks & RCAR_XHCI_FIRMWARE_V2)
157 firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2;
158 else if (quirks & RCAR_XHCI_FIRMWARE_V3)
159 firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3;
160 else
161 firmware_name = priv->firmware_name;
162
163 /* request R-Car USB3.0 firmware */
164 retval = request_firmware(&fw, firmware_name, dev);
165 if (retval)
166 return retval;
167
168 /* download R-Car USB3.0 firmware */
169 temp = readl(regs + RCAR_USB3_DL_CTRL);
170 temp |= RCAR_USB3_DL_CTRL_ENABLE;
171 writel(temp, regs + RCAR_USB3_DL_CTRL);
172
173 for (index = 0; index < fw->size; index += 4) {
174 /* to avoid reading beyond the end of the buffer */
175 for (data = 0, j = 3; j >= 0; j--) {
176 if ((j + index) < fw->size)
177 data |= fw->data[index + j] << (8 * j);
178 }
179 writel(data, regs + RCAR_USB3_FW_DATA0);
180 temp = readl(regs + RCAR_USB3_DL_CTRL);
181 temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
182 writel(temp, regs + RCAR_USB3_DL_CTRL);
183
184 for (time = 0; time < timeout; time++) {
185 val = readl(regs + RCAR_USB3_DL_CTRL);
186 if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
187 break;
188 udelay(1);
189 }
190 if (time == timeout) {
191 retval = -ETIMEDOUT;
192 break;
193 }
194 }
195
196 temp = readl(regs + RCAR_USB3_DL_CTRL);
197 temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
198 writel(temp, regs + RCAR_USB3_DL_CTRL);
199
200 for (time = 0; time < timeout; time++) {
201 val = readl(regs + RCAR_USB3_DL_CTRL);
202 if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
203 retval = 0;
204 break;
205 }
206 udelay(1);
207 }
208 if (time == timeout)
209 retval = -ETIMEDOUT;
210
211 release_firmware(fw);
212
213 return retval;
214}
215
216/* This function needs to initialize a "phy" of usb before */
217int xhci_rcar_init_quirk(struct usb_hcd *hcd)
218{
219 struct xhci_hcd *xhci = hcd_to_xhci(hcd);
220
221 /* If hcd->regs is NULL, we don't just call the following function */
222 if (!hcd->regs)
223 return 0;
224
225 /*
226 * On R-Car Gen2 and Gen3, the AC64 bit (bit 0) of HCCPARAMS1 is set
227 * to 1. However, these SoCs don't support 64-bit address memory
228 * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
229 * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
230 * xhci_gen_setup().
231 */
232 if (xhci_rcar_is_gen2(hcd->self.controller) ||
233 xhci_rcar_is_gen3(hcd->self.controller))
234 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
235
236 return xhci_rcar_download_firmware(hcd);
237}
238
239int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
240{
241 int ret;
242
243 ret = xhci_rcar_download_firmware(hcd);
244 if (!ret)
245 xhci_rcar_start(hcd);
246
247 return ret;
248}