1 /*
2  * (C) Copyright 2011, 2012, 2013
3  * Yuri Tikhonov, Emcraft Systems, yur@emcraft.com
4  * Alexander Potashev, Emcraft Systems, aspotashev@emcraft.com
5  * Vladimir Khusainov, Emcraft Systems, vlad@emcraft.com
6  * Pavel Boldin, Emcraft Systems, paboldin@emcraft.com
7  *
8  * (C) Copyright 2015
9  * Kamil Lulko, <kamil.lulko@gmail.com>
10  *
11  * SPDX-License-Identifier:	GPL-2.0+
12  */
13 
14 #include <common.h>
15 #include <dm.h>
16 #include <asm/io.h>
17 #include <asm/armv7m.h>
18 #include <asm/arch/stm32.h>
19 #include <asm/arch/gpio.h>
20 #include <asm/arch/fmc.h>
21 #include <dm/platform_data/serial_stm32.h>
22 #include <asm/arch/stm32_periph.h>
23 #include <asm/arch/stm32_defs.h>
24 
25 DECLARE_GLOBAL_DATA_PTR;
26 
27 const struct stm32_gpio_ctl gpio_ctl_gpout = {
28 	.mode = STM32_GPIO_MODE_OUT,
29 	.otype = STM32_GPIO_OTYPE_PP,
30 	.speed = STM32_GPIO_SPEED_50M,
31 	.pupd = STM32_GPIO_PUPD_NO,
32 	.af = STM32_GPIO_AF0
33 };
34 
35 const struct stm32_gpio_ctl gpio_ctl_usart = {
36 	.mode = STM32_GPIO_MODE_AF,
37 	.otype = STM32_GPIO_OTYPE_PP,
38 	.speed = STM32_GPIO_SPEED_50M,
39 	.pupd = STM32_GPIO_PUPD_UP,
40 	.af = STM32_GPIO_USART
41 };
42 
43 static const struct stm32_gpio_dsc usart_gpio[] = {
44 	{STM32_GPIO_PORT_X, STM32_GPIO_PIN_TX},	/* TX */
45 	{STM32_GPIO_PORT_X, STM32_GPIO_PIN_RX},	/* RX */
46 };
47 
48 int uart_setup_gpio(void)
49 {
50 	int i;
51 	int rv = 0;
52 
53 	clock_setup(GPIO_A_CLOCK_CFG);
54 	for (i = 0; i < ARRAY_SIZE(usart_gpio); i++) {
55 		rv = stm32_gpio_config(&usart_gpio[i], &gpio_ctl_usart);
56 		if (rv)
57 			goto out;
58 	}
59 
60 out:
61 	return rv;
62 }
63 
64 const struct stm32_gpio_ctl gpio_ctl_fmc = {
65 	.mode = STM32_GPIO_MODE_AF,
66 	.otype = STM32_GPIO_OTYPE_PP,
67 	.speed = STM32_GPIO_SPEED_100M,
68 	.pupd = STM32_GPIO_PUPD_NO,
69 	.af = STM32_GPIO_AF12
70 };
71 
72 static const struct stm32_gpio_dsc ext_ram_fmc_gpio[] = {
73 	/* Chip is LQFP144, see DM00077036.pdf for details */
74 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_10},	/* 79, FMC_D15 */
75 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_9},	/* 78, FMC_D14 */
76 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_8},	/* 77, FMC_D13 */
77 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_15},	/* 68, FMC_D12 */
78 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_14},	/* 67, FMC_D11 */
79 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_13},	/* 66, FMC_D10 */
80 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_12},	/* 65, FMC_D9 */
81 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_11},	/* 64, FMC_D8 */
82 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_10},	/* 63, FMC_D7 */
83 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_9},	/* 60, FMC_D6 */
84 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_8},	/* 59, FMC_D5 */
85 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_7},	/* 58, FMC_D4 */
86 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_1},	/* 115, FMC_D3 */
87 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_0},	/* 114, FMC_D2 */
88 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_15},	/* 86, FMC_D1 */
89 	{STM32_GPIO_PORT_D, STM32_GPIO_PIN_14},	/* 85, FMC_D0 */
90 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_1},	/* 142, FMC_NBL1 */
91 	{STM32_GPIO_PORT_E, STM32_GPIO_PIN_0},	/* 141, FMC_NBL0 */
92 	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_5},	/* 90, FMC_A15, BA1 */
93 	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_4},	/* 89, FMC_A14, BA0 */
94 	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_1},	/* 57, FMC_A11 */
95 	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_0},	/* 56, FMC_A10 */
96 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_15},	/* 55, FMC_A9 */
97 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_14},	/* 54, FMC_A8 */
98 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_13},	/* 53, FMC_A7 */
99 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_12},	/* 50, FMC_A6 */
100 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_5},	/* 15, FMC_A5 */
101 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_4},	/* 14, FMC_A4 */
102 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_3},	/* 13, FMC_A3 */
103 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_2},	/* 12, FMC_A2 */
104 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_1},	/* 11, FMC_A1 */
105 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_0},	/* 10, FMC_A0 */
106 	{STM32_GPIO_PORT_B, STM32_GPIO_PIN_6},	/* 136, SDRAM_NE */
107 	{STM32_GPIO_PORT_F, STM32_GPIO_PIN_11},	/* 49, SDRAM_NRAS */
108 	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_15},	/* 132, SDRAM_NCAS */
109 	{STM32_GPIO_PORT_C, STM32_GPIO_PIN_0},	/* 26, SDRAM_NWE */
110 	{STM32_GPIO_PORT_B, STM32_GPIO_PIN_5},	/* 135, SDRAM_CKE */
111 	{STM32_GPIO_PORT_G, STM32_GPIO_PIN_8},	/* 93, SDRAM_CLK */
112 };
113 
114 static int fmc_setup_gpio(void)
115 {
116 	int rv = 0;
117 	int i;
118 
119 	clock_setup(GPIO_B_CLOCK_CFG);
120 	clock_setup(GPIO_C_CLOCK_CFG);
121 	clock_setup(GPIO_D_CLOCK_CFG);
122 	clock_setup(GPIO_E_CLOCK_CFG);
123 	clock_setup(GPIO_F_CLOCK_CFG);
124 	clock_setup(GPIO_G_CLOCK_CFG);
125 
126 	for (i = 0; i < ARRAY_SIZE(ext_ram_fmc_gpio); i++) {
127 		rv = stm32_gpio_config(&ext_ram_fmc_gpio[i],
128 				&gpio_ctl_fmc);
129 		if (rv)
130 			goto out;
131 	}
132 
133 out:
134 	return rv;
135 }
136 
137 /*
138  * STM32 RCC FMC specific definitions
139  */
140 #define STM32_RCC_ENR_FMC	(1 << 0)	/* FMC module clock  */
141 
142 static inline u32 _ns2clk(u32 ns, u32 freq)
143 {
144 	u32 tmp = freq/1000000;
145 	return (tmp * ns) / 1000;
146 }
147 
148 #define NS2CLK(ns) (_ns2clk(ns, freq))
149 
150 /*
151  * Following are timings for IS42S16400J, from corresponding datasheet
152  */
153 #define SDRAM_CAS	3	/* 3 cycles */
154 #define SDRAM_NB	1	/* Number of banks */
155 #define SDRAM_MWID	1	/* 16 bit memory */
156 
157 #define SDRAM_NR	0x1	/* 12-bit row */
158 #define SDRAM_NC	0x0	/* 8-bit col */
159 #define SDRAM_RBURST	0x1	/* Single read requests always as bursts */
160 #define SDRAM_RPIPE	0x0	/* No HCLK clock cycle delay */
161 
162 #define SDRAM_TRRD	(NS2CLK(14) - 1)
163 #define SDRAM_TRCD	(NS2CLK(15) - 1)
164 #define SDRAM_TRP	(NS2CLK(15) - 1)
165 #define SDRAM_TRAS	(NS2CLK(42) - 1)
166 #define SDRAM_TRC	(NS2CLK(63) - 1)
167 #define SDRAM_TRFC	(NS2CLK(63) - 1)
168 #define SDRAM_TCDL	(1 - 1)
169 #define SDRAM_TRDL	(2 - 1)
170 #define SDRAM_TBDL	(1 - 1)
171 #define SDRAM_TREF	1386
172 #define SDRAM_TCCD	(1 - 1)
173 
174 #define SDRAM_TXSR	(NS2CLK(70) - 1)/* Row cycle time after precharge */
175 #define SDRAM_TMRD	(3 - 1)		/* Page 10, Mode Register Set */
176 
177 /* Last data-in to row precharge, need also comply ineq from RM 37.7.5 */
178 #define SDRAM_TWR	max(\
179 	(int)max((int)SDRAM_TRDL, (int)(SDRAM_TRAS - SDRAM_TRCD - 1)), \
180 	(int)(SDRAM_TRC - SDRAM_TRCD - SDRAM_TRP - 2)\
181 )
182 
183 #define SDRAM_MODE_BL_SHIFT	0
184 #define SDRAM_MODE_CAS_SHIFT	4
185 #define SDRAM_MODE_BL		0
186 #define SDRAM_MODE_CAS		SDRAM_CAS
187 
188 int dram_init(void)
189 {
190 	u32 freq;
191 	int rv;
192 
193 	rv = fmc_setup_gpio();
194 	if (rv)
195 		return rv;
196 
197 	setbits_le32(&STM32_RCC->ahb3enr, STM32_RCC_ENR_FMC);
198 
199 	/*
200 	 * Get frequency for NS2CLK calculation.
201 	 */
202 	freq = clock_get(CLOCK_AHB) / CONFIG_SYS_RAM_FREQ_DIV;
203 
204 	writel(CONFIG_SYS_RAM_FREQ_DIV << FMC_SDCR_SDCLK_SHIFT
205 		| SDRAM_RPIPE << FMC_SDCR_RPIPE_SHIFT
206 		| SDRAM_RBURST << FMC_SDCR_RBURST_SHIFT,
207 		&STM32_SDRAM_FMC->sdcr1);
208 
209 	writel(CONFIG_SYS_RAM_FREQ_DIV << FMC_SDCR_SDCLK_SHIFT
210 		| SDRAM_CAS << FMC_SDCR_CAS_SHIFT
211 		| SDRAM_NB << FMC_SDCR_NB_SHIFT
212 		| SDRAM_MWID << FMC_SDCR_MWID_SHIFT
213 		| SDRAM_NR << FMC_SDCR_NR_SHIFT
214 		| SDRAM_NC << FMC_SDCR_NC_SHIFT
215 		| SDRAM_RPIPE << FMC_SDCR_RPIPE_SHIFT
216 		| SDRAM_RBURST << FMC_SDCR_RBURST_SHIFT,
217 		&STM32_SDRAM_FMC->sdcr2);
218 
219 	writel(SDRAM_TRP << FMC_SDTR_TRP_SHIFT
220 		| SDRAM_TRC << FMC_SDTR_TRC_SHIFT,
221 		&STM32_SDRAM_FMC->sdtr1);
222 
223 	writel(SDRAM_TRCD << FMC_SDTR_TRCD_SHIFT
224 		| SDRAM_TRP << FMC_SDTR_TRP_SHIFT
225 		| SDRAM_TWR << FMC_SDTR_TWR_SHIFT
226 		| SDRAM_TRC << FMC_SDTR_TRC_SHIFT
227 		| SDRAM_TRAS << FMC_SDTR_TRAS_SHIFT
228 		| SDRAM_TXSR << FMC_SDTR_TXSR_SHIFT
229 		| SDRAM_TMRD << FMC_SDTR_TMRD_SHIFT,
230 		&STM32_SDRAM_FMC->sdtr2);
231 
232 	writel(FMC_SDCMR_BANK_2 | FMC_SDCMR_MODE_START_CLOCK,
233 	       &STM32_SDRAM_FMC->sdcmr);
234 
235 	udelay(200);	/* 200 us delay, page 10, "Power-Up" */
236 	FMC_BUSY_WAIT();
237 
238 	writel(FMC_SDCMR_BANK_2 | FMC_SDCMR_MODE_PRECHARGE,
239 	       &STM32_SDRAM_FMC->sdcmr);
240 
241 	udelay(100);
242 	FMC_BUSY_WAIT();
243 
244 	writel((FMC_SDCMR_BANK_2 | FMC_SDCMR_MODE_AUTOREFRESH
245 		| 7 << FMC_SDCMR_NRFS_SHIFT), &STM32_SDRAM_FMC->sdcmr);
246 
247 	udelay(100);
248 	FMC_BUSY_WAIT();
249 
250 	writel(FMC_SDCMR_BANK_2 | (SDRAM_MODE_BL << SDRAM_MODE_BL_SHIFT
251 		| SDRAM_MODE_CAS << SDRAM_MODE_CAS_SHIFT)
252 		<< FMC_SDCMR_MODE_REGISTER_SHIFT | FMC_SDCMR_MODE_WRITE_MODE,
253 		&STM32_SDRAM_FMC->sdcmr);
254 
255 	udelay(100);
256 
257 	FMC_BUSY_WAIT();
258 
259 	writel(FMC_SDCMR_BANK_2 | FMC_SDCMR_MODE_NORMAL,
260 	       &STM32_SDRAM_FMC->sdcmr);
261 
262 	FMC_BUSY_WAIT();
263 
264 	/* Refresh timer */
265 	writel(SDRAM_TREF, &STM32_SDRAM_FMC->sdrtr);
266 
267 	/*
268 	 * Fill in global info with description of SRAM configuration
269 	 */
270 	gd->bd->bi_dram[0].start = CONFIG_SYS_RAM_BASE;
271 	gd->bd->bi_dram[0].size  = CONFIG_SYS_RAM_SIZE;
272 
273 	gd->ram_size = CONFIG_SYS_RAM_SIZE;
274 
275 	return rv;
276 }
277 
278 static const struct stm32_serial_platdata serial_platdata = {
279 	.base = (struct stm32_usart *)STM32_USART1_BASE,
280 };
281 
282 U_BOOT_DEVICE(stm32_serials) = {
283 	.name = "serial_stm32",
284 	.platdata = &serial_platdata,
285 };
286 
287 u32 get_board_rev(void)
288 {
289 	return 0;
290 }
291 
292 int board_early_init_f(void)
293 {
294 	int res;
295 
296 	res = uart_setup_gpio();
297 	if (res)
298 		return res;
299 	clock_setup(USART1_CLOCK_CFG);
300 
301 	return 0;
302 }
303 
304 int board_init(void)
305 {
306 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
307 
308 	return 0;
309 }
310 
311 #ifdef CONFIG_MISC_INIT_R
312 int misc_init_r(void)
313 {
314 	char serialno[25];
315 	uint32_t u_id_low, u_id_mid, u_id_high;
316 
317 	if (!env_get("serial#")) {
318 		u_id_low  = readl(&STM32_U_ID->u_id_low);
319 		u_id_mid  = readl(&STM32_U_ID->u_id_mid);
320 		u_id_high = readl(&STM32_U_ID->u_id_high);
321 		sprintf(serialno, "%08x%08x%08x",
322 			u_id_high, u_id_mid, u_id_low);
323 		env_set("serial#", serialno);
324 	}
325 
326 	return 0;
327 }
328 #endif
329