1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <environment.h>
9 #include <misc.h>
10 #include <spl.h>
11 #include <syscon.h>
12 #include <usb.h>
13 #include <dm/pinctrl.h>
14 #include <dm/uclass-internal.h>
15 #include <asm/io.h>
16 #include <asm/gpio.h>
17 #include <asm/setup.h>
18 #include <asm/arch/clock.h>
19 #include <asm/arch/cru_rk3399.h>
20 #include <asm/arch/hardware.h>
21 #include <asm/arch/grf_rk3399.h>
22 #include <asm/arch/periph.h>
23 #include <power/regulator.h>
24 #include <u-boot/sha256.h>
25 
board_init(void)26 int board_init(void)
27 {
28 	int ret;
29 
30 	/*
31 	 * We need to call into regulators_enable_boot_on() again, as the call
32 	 * during SPL may have not included all regulators.
33 	 */
34 	ret = regulators_enable_boot_on(false);
35 	if (ret)
36 		debug("%s: Cannot enable boot on regulator\n", __func__);
37 
38 	return 0;
39 }
40 
rk3399_force_power_on_reset(void)41 static void rk3399_force_power_on_reset(void)
42 {
43 	ofnode node;
44 	struct gpio_desc sysreset_gpio;
45 
46 	debug("%s: trying to force a power-on reset\n", __func__);
47 
48 	node = ofnode_path("/config");
49 	if (!ofnode_valid(node)) {
50 		debug("%s: no /config node?\n", __func__);
51 		return;
52 	}
53 
54 	if (gpio_request_by_name_nodev(node, "sysreset-gpio", 0,
55 				       &sysreset_gpio, GPIOD_IS_OUT)) {
56 		debug("%s: could not find a /config/sysreset-gpio\n", __func__);
57 		return;
58 	}
59 
60 	dm_gpio_set_value(&sysreset_gpio, 1);
61 }
62 
spl_board_init(void)63 void spl_board_init(void)
64 {
65 	int  ret;
66 	struct rk3399_cru *cru = rockchip_get_cru();
67 
68 	/*
69 	 * The RK3399 resets only 'almost all logic' (see also in the TRM
70 	 * "3.9.4 Global software reset"), when issuing a software reset.
71 	 * This may cause issues during boot-up for some configurations of
72 	 * the application software stack.
73 	 *
74 	 * To work around this, we test whether the last reset reason was
75 	 * a power-on reset and (if not) issue an overtemp-reset to reset
76 	 * the entire module.
77 	 *
78 	 * While this was previously fixed by modifying the various places
79 	 * that could generate a software reset (e.g. U-Boot's sysreset
80 	 * driver, the ATF or Linux), we now have it here to ensure that
81 	 * we no longer have to track this through the various components.
82 	 */
83 	if (cru->glb_rst_st != 0)
84 		rk3399_force_power_on_reset();
85 
86 	/*
87 	 * Turning the eMMC and SPI back on (if disabled via the Qseven
88 	 * BIOS_ENABLE) signal is done through a always-on regulator).
89 	 */
90 	ret = regulators_enable_boot_on(false);
91 	if (ret)
92 		debug("%s: Cannot enable boot on regulator\n", __func__);
93 
94 	preloader_console_init();
95 }
96 
setup_macaddr(void)97 static void setup_macaddr(void)
98 {
99 #if CONFIG_IS_ENABLED(CMD_NET)
100 	int ret;
101 	const char *cpuid = env_get("cpuid#");
102 	u8 hash[SHA256_SUM_LEN];
103 	int size = sizeof(hash);
104 	u8 mac_addr[6];
105 
106 	/* Only generate a MAC address, if none is set in the environment */
107 	if (env_get("ethaddr"))
108 		return;
109 
110 	if (!cpuid) {
111 		debug("%s: could not retrieve 'cpuid#'\n", __func__);
112 		return;
113 	}
114 
115 	ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
116 	if (ret) {
117 		debug("%s: failed to calculate SHA256\n", __func__);
118 		return;
119 	}
120 
121 	/* Copy 6 bytes of the hash to base the MAC address on */
122 	memcpy(mac_addr, hash, 6);
123 
124 	/* Make this a valid MAC address and set it */
125 	mac_addr[0] &= 0xfe;  /* clear multicast bit */
126 	mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
127 	eth_env_set_enetaddr("ethaddr", mac_addr);
128 #endif
129 }
130 
setup_serial(void)131 static void setup_serial(void)
132 {
133 #if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
134 	const u32 cpuid_offset = 0x7;
135 	const u32 cpuid_length = 0x10;
136 
137 	struct udevice *dev;
138 	int ret, i;
139 	u8 cpuid[cpuid_length];
140 	u8 low[cpuid_length/2], high[cpuid_length/2];
141 	char cpuid_str[cpuid_length * 2 + 1];
142 	u64 serialno;
143 	char serialno_str[17];
144 
145 	/* retrieve the device */
146 	ret = uclass_get_device_by_driver(UCLASS_MISC,
147 					  DM_GET_DRIVER(rockchip_efuse), &dev);
148 	if (ret) {
149 		debug("%s: could not find efuse device\n", __func__);
150 		return;
151 	}
152 
153 	/* read the cpu_id range from the efuses */
154 	ret = misc_read(dev, cpuid_offset, &cpuid, sizeof(cpuid));
155 	if (ret) {
156 		debug("%s: reading cpuid from the efuses failed\n",
157 		      __func__);
158 		return;
159 	}
160 
161 	memset(cpuid_str, 0, sizeof(cpuid_str));
162 	for (i = 0; i < 16; i++)
163 		sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);
164 
165 	debug("cpuid: %s\n", cpuid_str);
166 
167 	/*
168 	 * Mix the cpuid bytes using the same rules as in
169 	 *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
170 	 */
171 	for (i = 0; i < 8; i++) {
172 		low[i] = cpuid[1 + (i << 1)];
173 		high[i] = cpuid[i << 1];
174 	}
175 
176 	serialno = crc32_no_comp(0, low, 8);
177 	serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
178 	snprintf(serialno_str, sizeof(serialno_str), "%016llx", serialno);
179 
180 	env_set("cpuid#", cpuid_str);
181 	env_set("serial#", serialno_str);
182 #endif
183 }
184 
setup_iodomain(void)185 static void setup_iodomain(void)
186 {
187 	const u32 GRF_IO_VSEL_GPIO4CD_SHIFT = 3;
188 	struct rk3399_grf_regs *grf =
189 	    syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
190 
191 	/*
192 	 * Set bit 3 in GRF_IO_VSEL so PCIE_RST# works (pin GPIO4_C6).
193 	 * Linux assumes that PCIE_RST# works out of the box as it probes
194 	 * PCIe before loading the iodomain driver.
195 	 */
196 	rk_setreg(&grf->io_vsel, 1 << GRF_IO_VSEL_GPIO4CD_SHIFT);
197 }
198 
199 /*
200  * Swap mmc0 and mmc1 in boot_targets if booted from SD-Card.
201  *
202  * If bootsource is uSD-card we can assume that we want to use the
203  * SD-Card instead of the eMMC as first boot_target for distroboot.
204  * We only want to swap the defaults and not any custom environment a
205  * user has set. We exit early if a changed boot_targets environment
206  * is detected.
207  */
setup_boottargets(void)208 static int setup_boottargets(void)
209 {
210 	const char *boot_device =
211 		ofnode_get_chosen_prop("u-boot,spl-boot-device");
212 	char *env_default, *env;
213 
214 	if (!boot_device) {
215 		debug("%s: /chosen/u-boot,spl-boot-device not set\n",
216 		      __func__);
217 		return -1;
218 	}
219 	debug("%s: booted from %s\n", __func__, boot_device);
220 
221 	env_default = env_get_default("boot_targets");
222 	env = env_get("boot_targets");
223 	if (!env) {
224 		debug("%s: boot_targets does not exist\n", __func__);
225 		return -1;
226 	}
227 	debug("%s: boot_targets current: %s - default: %s\n",
228 	      __func__, env, env_default);
229 
230 	if (strcmp(env_default, env) != 0) {
231 		debug("%s: boot_targets not default, don't change it\n",
232 		      __func__);
233 		return 0;
234 	}
235 
236 	/*
237 	 * Only run, if booting from mmc1 (i.e. /dwmmc@fe320000) and
238 	 * only consider cases where the default boot-order first
239 	 * tries to boot from mmc0 (eMMC) and then from mmc1
240 	 * (i.e. external SD).
241 	 *
242 	 * In other words: the SD card will be moved to earlier in the
243 	 * order, if U-Boot was also loaded from the SD-card.
244 	 */
245 	if (!strcmp(boot_device, "/dwmmc@fe320000")) {
246 		char *mmc0, *mmc1;
247 
248 		debug("%s: booted from SD-Card\n", __func__);
249 		mmc0 = strstr(env, "mmc0");
250 		mmc1 = strstr(env, "mmc1");
251 
252 		if (!mmc0 || !mmc1) {
253 			debug("%s: only one mmc boot_target found\n", __func__);
254 			return -1;
255 		}
256 
257 		/*
258 		 * If mmc0 comes first in the boot order, we need to change
259 		 * the strings to make mmc1 first.
260 		 */
261 		if (mmc0 < mmc1) {
262 			mmc0[3] = '1';
263 			mmc1[3] = '0';
264 			debug("%s: set boot_targets to: %s\n", __func__, env);
265 			env_set("boot_targets", env);
266 		}
267 	}
268 
269 	return 0;
270 }
271 
misc_init_r(void)272 int misc_init_r(void)
273 {
274 	setup_serial();
275 	setup_macaddr();
276 	setup_iodomain();
277 	setup_boottargets();
278 
279 	return 0;
280 }
281 
282 #ifdef CONFIG_SERIAL_TAG
get_board_serial(struct tag_serialnr * serialnr)283 void get_board_serial(struct tag_serialnr *serialnr)
284 {
285 	char *serial_string;
286 	u64 serial = 0;
287 
288 	serial_string = env_get("serial#");
289 
290 	if (serial_string)
291 		serial = simple_strtoull(serial_string, NULL, 16);
292 
293 	serialnr->high = (u32)(serial >> 32);
294 	serialnr->low = (u32)(serial & 0xffffffff);
295 }
296 #endif
297 
298 /**
299  * Switch power at an external regulator (for our root hub).
300  *
301  * @param ctrl pointer to the xHCI controller
302  * @param port port number as in the control message (one-based)
303  * @param enable boolean indicating whether to enable or disable power
304  * @return returns 0 on success, an error-code on failure
305  */
board_usb_port_power_set(struct udevice * dev,int port,bool enable)306 static int board_usb_port_power_set(struct udevice *dev, int port,
307 				    bool enable)
308 {
309 #if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_REGULATOR)
310 	/* We start counting ports at 0, while USB counts from 1. */
311 	int index = port - 1;
312 	const char *regname = NULL;
313 	struct udevice *regulator;
314 	const char *prop = "tsd,usb-port-power";
315 	int ret;
316 
317 	debug("%s: ctrl '%s' port %d enable %s\n", __func__,
318 	      dev_read_name(dev), port, enable ? "true" : "false");
319 
320 	ret = dev_read_string_index(dev, prop, index, &regname);
321 	if (ret < 0) {
322 		debug("%s: ctrl '%s' port %d: no entry in '%s'\n",
323 		      __func__, dev_read_name(dev), port, prop);
324 		return ret;
325 	}
326 
327 	ret = regulator_get_by_platname(regname, &regulator);
328 	if (ret) {
329 		debug("%s: ctrl '%s' port %d: could not get regulator '%s'\n",
330 		      __func__, dev_read_name(dev), port, regname);
331 		return ret;
332 	}
333 
334 	regulator_set_enable(regulator, enable);
335 	return 0;
336 #else
337 	return -ENOTSUPP;
338 #endif
339 }
340 
usb_hub_reset_devices(struct usb_hub_device * hub,int port)341 void usb_hub_reset_devices(struct usb_hub_device *hub, int port)
342 {
343 	struct udevice *dev = hub->pusb_dev->dev;
344 	struct udevice *ctrl;
345 
346 	/* We are only interested in our root-hubs */
347 	if (usb_hub_is_root_hub(dev) == false)
348 		return;
349 
350 	ctrl = usb_get_bus(dev);
351 	if (!ctrl) {
352 		debug("%s: could not retrieve ctrl for hub\n", __func__);
353 		return;
354 	}
355 
356 	/*
357 	 * To work around an incompatibility between the single-threaded
358 	 * USB stack in U-Boot and (a strange low-power mode of) the USB
359 	 * hub we have on-module, we need to delay powering on the hub
360 	 * until the first time the port is probed.
361 	 */
362 	board_usb_port_power_set(ctrl, port, true);
363 }
364