1 /*
2  * (C) Copyright 2015 Google, Inc
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <debug_uart.h>
9 #include <dm.h>
10 #include <fdtdec.h>
11 #include <led.h>
12 #include <malloc.h>
13 #include <ram.h>
14 #include <spl.h>
15 #include <asm/gpio.h>
16 #include <asm/io.h>
17 #include <asm/arch/clock.h>
18 #include <asm/arch/hardware.h>
19 #include <asm/arch/periph.h>
20 #include <asm/arch/sdram.h>
21 #include <asm/arch/timer.h>
22 #include <dm/pinctrl.h>
23 #include <dm/root.h>
24 #include <dm/test.h>
25 #include <dm/util.h>
26 #include <power/regulator.h>
27 
28 DECLARE_GLOBAL_DATA_PTR;
29 
30 u32 spl_boot_device(void)
31 {
32 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
33 	const void *blob = gd->fdt_blob;
34 	struct udevice *dev;
35 	const char *bootdev;
36 	int node;
37 	int ret;
38 
39 	bootdev = fdtdec_get_config_string(blob, "u-boot,boot0");
40 	debug("Boot device %s\n", bootdev);
41 	if (!bootdev)
42 		goto fallback;
43 
44 	node = fdt_path_offset(blob, bootdev);
45 	if (node < 0) {
46 		debug("node=%d\n", node);
47 		goto fallback;
48 	}
49 	ret = device_get_global_by_of_offset(node, &dev);
50 	if (ret) {
51 		debug("device at node %s/%d not found: %d\n", bootdev, node,
52 		      ret);
53 		goto fallback;
54 	}
55 	debug("Found device %s\n", dev->name);
56 	switch (device_get_uclass_id(dev)) {
57 	case UCLASS_SPI_FLASH:
58 		return BOOT_DEVICE_SPI;
59 	case UCLASS_MMC:
60 		return BOOT_DEVICE_MMC1;
61 	default:
62 		debug("Booting from device uclass '%s' not supported\n",
63 		      dev_get_uclass_name(dev));
64 	}
65 
66 fallback:
67 #endif
68 	return BOOT_DEVICE_MMC1;
69 }
70 
71 u32 spl_boot_mode(const u32 boot_device)
72 {
73 	return MMCSD_MODE_RAW;
74 }
75 
76 /* read L2 control register (L2CTLR) */
77 static inline uint32_t read_l2ctlr(void)
78 {
79 	uint32_t val = 0;
80 
81 	asm volatile ("mrc p15, 1, %0, c9, c0, 2" : "=r" (val));
82 
83 	return val;
84 }
85 
86 /* write L2 control register (L2CTLR) */
87 static inline void write_l2ctlr(uint32_t val)
88 {
89 	/*
90 	 * Note: L2CTLR can only be written when the L2 memory system
91 	 * is idle, ie before the MMU is enabled.
92 	 */
93 	asm volatile("mcr p15, 1, %0, c9, c0, 2" : : "r" (val) : "memory");
94 	isb();
95 }
96 
97 static void configure_l2ctlr(void)
98 {
99 	uint32_t l2ctlr;
100 
101 	l2ctlr = read_l2ctlr();
102 	l2ctlr &= 0xfffc0000; /* clear bit0~bit17 */
103 
104 	/*
105 	* Data RAM write latency: 2 cycles
106 	* Data RAM read latency: 2 cycles
107 	* Data RAM setup latency: 1 cycle
108 	* Tag RAM write latency: 1 cycle
109 	* Tag RAM read latency: 1 cycle
110 	* Tag RAM setup latency: 1 cycle
111 	*/
112 	l2ctlr |= (1 << 3 | 1 << 0);
113 	write_l2ctlr(l2ctlr);
114 }
115 
116 #ifdef CONFIG_SPL_MMC_SUPPORT
117 static int configure_emmc(struct udevice *pinctrl)
118 {
119 #if defined(CONFIG_TARGET_CHROMEBOOK_JERRY)
120 
121 	struct gpio_desc desc;
122 	int ret;
123 
124 	pinctrl_request_noflags(pinctrl, PERIPH_ID_EMMC);
125 
126 	/*
127 	 * TODO(sjg@chromium.org): Pick this up from device tree or perhaps
128 	 * use the EMMC_PWREN setting.
129 	 */
130 	ret = dm_gpio_lookup_name("D9", &desc);
131 	if (ret) {
132 		debug("gpio ret=%d\n", ret);
133 		return ret;
134 	}
135 	ret = dm_gpio_request(&desc, "emmc_pwren");
136 	if (ret) {
137 		debug("gpio_request ret=%d\n", ret);
138 		return ret;
139 	}
140 	ret = dm_gpio_set_dir_flags(&desc, GPIOD_IS_OUT);
141 	if (ret) {
142 		debug("gpio dir ret=%d\n", ret);
143 		return ret;
144 	}
145 	ret = dm_gpio_set_value(&desc, 1);
146 	if (ret) {
147 		debug("gpio value ret=%d\n", ret);
148 		return ret;
149 	}
150 #endif
151 	return 0;
152 }
153 #endif
154 extern void back_to_bootrom(void);
155 void board_init_f(ulong dummy)
156 {
157 	struct udevice *pinctrl;
158 	struct udevice *dev;
159 	int ret;
160 
161 	/* Example code showing how to enable the debug UART on RK3288 */
162 #ifdef EARLY_UART
163 #include <asm/arch/grf_rk3288.h>
164 	/* Enable early UART on the RK3288 */
165 #define GRF_BASE	0xff770000
166 	struct rk3288_grf * const grf = (void *)GRF_BASE;
167 
168 	rk_clrsetreg(&grf->gpio7ch_iomux, GPIO7C7_MASK << GPIO7C7_SHIFT |
169 		     GPIO7C6_MASK << GPIO7C6_SHIFT,
170 		     GPIO7C7_UART2DBG_SOUT << GPIO7C7_SHIFT |
171 		     GPIO7C6_UART2DBG_SIN << GPIO7C6_SHIFT);
172 	/*
173 	 * Debug UART can be used from here if required:
174 	 *
175 	 * debug_uart_init();
176 	 * printch('a');
177 	 * printhex8(0x1234);
178 	 * printascii("string");
179 	 */
180 	debug_uart_init();
181 #endif
182 
183 	ret = spl_init();
184 	if (ret) {
185 		debug("spl_init() failed: %d\n", ret);
186 		hang();
187 	}
188 
189 	rockchip_timer_init();
190 	configure_l2ctlr();
191 
192 	ret = rockchip_get_clk(&dev);
193 	if (ret) {
194 		debug("CLK init failed: %d\n", ret);
195 		return;
196 	}
197 
198 	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
199 	if (ret) {
200 		debug("Pinctrl init failed: %d\n", ret);
201 		return;
202 	}
203 
204 	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
205 	if (ret) {
206 		debug("DRAM init failed: %d\n", ret);
207 		return;
208 	}
209 #ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
210 	back_to_bootrom();
211 #endif
212 }
213 
214 static int setup_led(void)
215 {
216 #ifdef CONFIG_SPL_LED
217 	struct udevice *dev;
218 	char *led_name;
219 	int ret;
220 
221 	led_name = fdtdec_get_config_string(gd->fdt_blob, "u-boot,boot-led");
222 	if (!led_name)
223 		return 0;
224 	ret = led_get_by_label(led_name, &dev);
225 	if (ret) {
226 		debug("%s: get=%d\n", __func__, ret);
227 		return ret;
228 	}
229 	ret = led_set_on(dev, 1);
230 	if (ret)
231 		return ret;
232 #endif
233 
234 	return 0;
235 }
236 
237 void spl_board_init(void)
238 {
239 	struct udevice *pinctrl;
240 	int ret;
241 
242 	ret = setup_led();
243 
244 	if (ret) {
245 		debug("LED ret=%d\n", ret);
246 		hang();
247 	}
248 
249 	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
250 	if (ret) {
251 		debug("%s: Cannot find pinctrl device\n", __func__);
252 		goto err;
253 	}
254 
255 #ifdef CONFIG_SPL_MMC_SUPPORT
256 	ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_SDCARD);
257 	if (ret) {
258 		debug("%s: Failed to set up SD card\n", __func__);
259 		goto err;
260 	}
261 	ret = configure_emmc(pinctrl);
262 	if (ret) {
263 		debug("%s: Failed to set up eMMC\n", __func__);
264 		goto err;
265 	}
266 #endif
267 
268 	/* Enable debug UART */
269 	ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART_DBG);
270 	if (ret) {
271 		debug("%s: Failed to set up console UART\n", __func__);
272 		goto err;
273 	}
274 
275 	preloader_console_init();
276 	return;
277 err:
278 	printf("spl_board_init: Error %d\n", ret);
279 
280 	/* No way to report error here */
281 	hang();
282 }
283