1 /*
2  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <misc.h>
10 #include <spl.h>
11 #include <usb.h>
12 #include <dm/pinctrl.h>
13 #include <dm/uclass-internal.h>
14 #include <asm/gpio.h>
15 #include <asm/setup.h>
16 #include <asm/arch/clock.h>
17 #include <asm/arch/cru_rk3399.h>
18 #include <asm/arch/periph.h>
19 #include <power/regulator.h>
20 #include <u-boot/sha256.h>
21 
22 DECLARE_GLOBAL_DATA_PTR;
23 
24 int board_init(void)
25 {
26 	int ret;
27 
28 	/*
29 	 * We need to call into regulators_enable_boot_on() again, as the call
30 	 * during SPL may have not included all regulators.
31 	 */
32 	ret = regulators_enable_boot_on(false);
33 	if (ret)
34 		debug("%s: Cannot enable boot on regulator\n", __func__);
35 
36 	return 0;
37 }
38 
39 static void rk3399_force_power_on_reset(void)
40 {
41 	ofnode node;
42 	struct gpio_desc sysreset_gpio;
43 
44 	debug("%s: trying to force a power-on reset\n", __func__);
45 
46 	node = ofnode_path("/config");
47 	if (!ofnode_valid(node)) {
48 		debug("%s: no /config node?\n", __func__);
49 		return;
50 	}
51 
52 	if (gpio_request_by_name_nodev(node, "sysreset-gpio", 0,
53 				       &sysreset_gpio, GPIOD_IS_OUT)) {
54 		debug("%s: could not find a /config/sysreset-gpio\n", __func__);
55 		return;
56 	}
57 
58 	dm_gpio_set_value(&sysreset_gpio, 1);
59 }
60 
61 void spl_board_init(void)
62 {
63 	int  ret;
64 	struct rk3399_cru *cru = rockchip_get_cru();
65 
66 	/*
67 	 * The RK3399 resets only 'almost all logic' (see also in the TRM
68 	 * "3.9.4 Global software reset"), when issuing a software reset.
69 	 * This may cause issues during boot-up for some configurations of
70 	 * the application software stack.
71 	 *
72 	 * To work around this, we test whether the last reset reason was
73 	 * a power-on reset and (if not) issue an overtemp-reset to reset
74 	 * the entire module.
75 	 *
76 	 * While this was previously fixed by modifying the various places
77 	 * that could generate a software reset (e.g. U-Boot's sysreset
78 	 * driver, the ATF or Linux), we now have it here to ensure that
79 	 * we no longer have to track this through the various components.
80 	 */
81 	if (cru->glb_rst_st != 0)
82 		rk3399_force_power_on_reset();
83 
84 	/*
85 	 * Turning the eMMC and SPI back on (if disabled via the Qseven
86 	 * BIOS_ENABLE) signal is done through a always-on regulator).
87 	 */
88 	ret = regulators_enable_boot_on(false);
89 	if (ret)
90 		debug("%s: Cannot enable boot on regulator\n", __func__);
91 
92 	preloader_console_init();
93 }
94 
95 static void setup_macaddr(void)
96 {
97 #if CONFIG_IS_ENABLED(CMD_NET)
98 	int ret;
99 	const char *cpuid = env_get("cpuid#");
100 	u8 hash[SHA256_SUM_LEN];
101 	int size = sizeof(hash);
102 	u8 mac_addr[6];
103 
104 	/* Only generate a MAC address, if none is set in the environment */
105 	if (env_get("ethaddr"))
106 		return;
107 
108 	if (!cpuid) {
109 		debug("%s: could not retrieve 'cpuid#'\n", __func__);
110 		return;
111 	}
112 
113 	ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
114 	if (ret) {
115 		debug("%s: failed to calculate SHA256\n", __func__);
116 		return;
117 	}
118 
119 	/* Copy 6 bytes of the hash to base the MAC address on */
120 	memcpy(mac_addr, hash, 6);
121 
122 	/* Make this a valid MAC address and set it */
123 	mac_addr[0] &= 0xfe;  /* clear multicast bit */
124 	mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
125 	eth_env_set_enetaddr("ethaddr", mac_addr);
126 #endif
127 }
128 
129 static void setup_serial(void)
130 {
131 #if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
132 	const u32 cpuid_offset = 0x7;
133 	const u32 cpuid_length = 0x10;
134 
135 	struct udevice *dev;
136 	int ret, i;
137 	u8 cpuid[cpuid_length];
138 	u8 low[cpuid_length/2], high[cpuid_length/2];
139 	char cpuid_str[cpuid_length * 2 + 1];
140 	u64 serialno;
141 	char serialno_str[17];
142 
143 	/* retrieve the device */
144 	ret = uclass_get_device_by_driver(UCLASS_MISC,
145 					  DM_GET_DRIVER(rockchip_efuse), &dev);
146 	if (ret) {
147 		debug("%s: could not find efuse device\n", __func__);
148 		return;
149 	}
150 
151 	/* read the cpu_id range from the efuses */
152 	ret = misc_read(dev, cpuid_offset, &cpuid, sizeof(cpuid));
153 	if (ret) {
154 		debug("%s: reading cpuid from the efuses failed\n",
155 		      __func__);
156 		return;
157 	}
158 
159 	memset(cpuid_str, 0, sizeof(cpuid_str));
160 	for (i = 0; i < 16; i++)
161 		sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);
162 
163 	debug("cpuid: %s\n", cpuid_str);
164 
165 	/*
166 	 * Mix the cpuid bytes using the same rules as in
167 	 *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
168 	 */
169 	for (i = 0; i < 8; i++) {
170 		low[i] = cpuid[1 + (i << 1)];
171 		high[i] = cpuid[i << 1];
172 	}
173 
174 	serialno = crc32_no_comp(0, low, 8);
175 	serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
176 	snprintf(serialno_str, sizeof(serialno_str), "%llx", serialno);
177 
178 	env_set("cpuid#", cpuid_str);
179 	env_set("serial#", serialno_str);
180 #endif
181 }
182 
183 int misc_init_r(void)
184 {
185 	setup_serial();
186 	setup_macaddr();
187 
188 	return 0;
189 }
190 
191 #ifdef CONFIG_SERIAL_TAG
192 void get_board_serial(struct tag_serialnr *serialnr)
193 {
194 	char *serial_string;
195 	u64 serial = 0;
196 
197 	serial_string = env_get("serial#");
198 
199 	if (serial_string)
200 		serial = simple_strtoull(serial_string, NULL, 16);
201 
202 	serialnr->high = (u32)(serial >> 32);
203 	serialnr->low = (u32)(serial & 0xffffffff);
204 }
205 #endif
206 
207 /**
208  * Switch power at an external regulator (for our root hub).
209  *
210  * @param ctrl pointer to the xHCI controller
211  * @param port port number as in the control message (one-based)
212  * @param enable boolean indicating whether to enable or disable power
213  * @return returns 0 on success, an error-code on failure
214  */
215 static int board_usb_port_power_set(struct udevice *dev, int port,
216 				    bool enable)
217 {
218 #if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_REGULATOR)
219 	/* We start counting ports at 0, while USB counts from 1. */
220 	int index = port - 1;
221 	const char *regname = NULL;
222 	struct udevice *regulator;
223 	const char *prop = "tsd,usb-port-power";
224 	int ret;
225 
226 	debug("%s: ctrl '%s' port %d enable %s\n", __func__,
227 	      dev_read_name(dev), port, enable ? "true" : "false");
228 
229 	ret = dev_read_string_index(dev, prop, index, &regname);
230 	if (ret < 0) {
231 		debug("%s: ctrl '%s' port %d: no entry in '%s'\n",
232 		      __func__, dev_read_name(dev), port, prop);
233 		return ret;
234 	}
235 
236 	ret = regulator_get_by_platname(regname, &regulator);
237 	if (ret) {
238 		debug("%s: ctrl '%s' port %d: could not get regulator '%s'\n",
239 		      __func__, dev_read_name(dev), port, regname);
240 		return ret;
241 	}
242 
243 	regulator_set_enable(regulator, enable);
244 	return 0;
245 #else
246 	return -ENOTSUPP;
247 #endif
248 }
249 
250 void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
251 {
252 	struct udevice *dev = hub->pusb_dev->dev;
253 	struct udevice *ctrl;
254 
255 	/* We are only interested in our root-hubs */
256 	if (usb_hub_is_root_hub(dev) == false)
257 		return;
258 
259 	ctrl = usb_get_bus(dev);
260 	if (!ctrl) {
261 		debug("%s: could not retrieve ctrl for hub\n", __func__);
262 		return;
263 	}
264 
265 	/*
266 	 * To work around an incompatibility between the single-threaded
267 	 * USB stack in U-Boot and (a strange low-power mode of) the USB
268 	 * hub we have on-module, we need to delay powering on the hub
269 	 * until the first time the port is probed.
270 	 */
271 	board_usb_port_power_set(ctrl, port, true);
272 }
273