1 /*
2  * Copyright (C) 2016-2017 Intel Corporation
3  *
4  * SPDX-License-Identifier:    GPL-2.0
5  */
6 
7 #include <asm/io.h>
8 #include <asm/arch/fpga_manager.h>
9 #include <asm/arch/misc.h>
10 #include <asm/arch/reset_manager.h>
11 #include <asm/arch/system_manager.h>
12 #include <common.h>
13 #include <errno.h>
14 #include <fdtdec.h>
15 #include <wait_bit.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 static const struct socfpga_reset_manager *reset_manager_base =
20 		(void *)SOCFPGA_RSTMGR_ADDRESS;
21 static const struct socfpga_system_manager *sysmgr_regs =
22 		(struct socfpga_system_manager *)SOCFPGA_SYSMGR_ADDRESS;
23 
24 #define ECC_MASK (ALT_RSTMGR_PER0MODRST_EMACECC0_SET_MSK | \
25 	ALT_RSTMGR_PER0MODRST_EMACECC1_SET_MSK | \
26 	ALT_RSTMGR_PER0MODRST_EMACECC2_SET_MSK | \
27 	ALT_RSTMGR_PER0MODRST_NANDECC_SET_MSK | \
28 	ALT_RSTMGR_PER0MODRST_QSPIECC_SET_MSK | \
29 	ALT_RSTMGR_PER0MODRST_SDMMCECC_SET_MSK)
30 
31 void socfpga_reset_uart(int assert)
32 {
33 	unsigned int com_port;
34 
35 	com_port = uart_com_port(gd->fdt_blob);
36 
37 	if (com_port == SOCFPGA_UART1_ADDRESS)
38 		socfpga_per_reset(SOCFPGA_RESET(UART1), assert);
39 	else if (com_port == SOCFPGA_UART0_ADDRESS)
40 		socfpga_per_reset(SOCFPGA_RESET(UART0), assert);
41 }
42 
43 static const u32 per0fpgamasks[] = {
44 	ALT_RSTMGR_PER0MODRST_EMACECC0_SET_MSK |
45 	ALT_RSTMGR_PER0MODRST_EMAC0_SET_MSK,
46 	ALT_RSTMGR_PER0MODRST_EMACECC1_SET_MSK |
47 	ALT_RSTMGR_PER0MODRST_EMAC1_SET_MSK,
48 	ALT_RSTMGR_PER0MODRST_EMACECC2_SET_MSK |
49 	ALT_RSTMGR_PER0MODRST_EMAC2_SET_MSK,
50 	0, /* i2c0 per1mod */
51 	0, /* i2c1 per1mod */
52 	0, /* i2c0_emac */
53 	0, /* i2c1_emac */
54 	0, /* i2c2_emac */
55 	ALT_RSTMGR_PER0MODRST_NANDECC_SET_MSK |
56 	ALT_RSTMGR_PER0MODRST_NAND_SET_MSK,
57 	ALT_RSTMGR_PER0MODRST_QSPIECC_SET_MSK |
58 	ALT_RSTMGR_PER0MODRST_QSPI_SET_MSK,
59 	ALT_RSTMGR_PER0MODRST_SDMMCECC_SET_MSK |
60 	ALT_RSTMGR_PER0MODRST_SDMMC_SET_MSK,
61 	ALT_RSTMGR_PER0MODRST_SPIM0_SET_MSK,
62 	ALT_RSTMGR_PER0MODRST_SPIM1_SET_MSK,
63 	ALT_RSTMGR_PER0MODRST_SPIS0_SET_MSK,
64 	ALT_RSTMGR_PER0MODRST_SPIS1_SET_MSK,
65 	0, /* uart0 per1mod */
66 	0, /* uart1 per1mod */
67 };
68 
69 static const u32 per1fpgamasks[] = {
70 	0, /* emac0 per0mod */
71 	0, /* emac1 per0mod */
72 	0, /* emac2 per0mod */
73 	ALT_RSTMGR_PER1MODRST_I2C0_SET_MSK,
74 	ALT_RSTMGR_PER1MODRST_I2C1_SET_MSK,
75 	ALT_RSTMGR_PER1MODRST_I2C2_SET_MSK, /* i2c0_emac */
76 	ALT_RSTMGR_PER1MODRST_I2C3_SET_MSK, /* i2c1_emac */
77 	ALT_RSTMGR_PER1MODRST_I2C4_SET_MSK, /* i2c2_emac */
78 	0, /* nand per0mod */
79 	0, /* qspi per0mod */
80 	0, /* sdmmc per0mod */
81 	0, /* spim0 per0mod */
82 	0, /* spim1 per0mod */
83 	0, /* spis0 per0mod */
84 	0, /* spis1 per0mod */
85 	ALT_RSTMGR_PER1MODRST_UART0_SET_MSK,
86 	ALT_RSTMGR_PER1MODRST_UART1_SET_MSK,
87 };
88 
89 struct bridge_cfg {
90 	int compat_id;
91 	u32  mask_noc;
92 	u32  mask_rstmgr;
93 };
94 
95 static const struct bridge_cfg bridge_cfg_tbl[] = {
96 	{
97 		COMPAT_ALTERA_SOCFPGA_H2F_BRG,
98 		ALT_SYSMGR_NOC_H2F_SET_MSK,
99 		ALT_RSTMGR_BRGMODRST_H2F_SET_MSK,
100 	},
101 	{
102 		COMPAT_ALTERA_SOCFPGA_LWH2F_BRG,
103 		ALT_SYSMGR_NOC_LWH2F_SET_MSK,
104 		ALT_RSTMGR_BRGMODRST_LWH2F_SET_MSK,
105 	},
106 	{
107 		COMPAT_ALTERA_SOCFPGA_F2H_BRG,
108 		ALT_SYSMGR_NOC_F2H_SET_MSK,
109 		ALT_RSTMGR_BRGMODRST_F2H_SET_MSK,
110 	},
111 	{
112 		COMPAT_ALTERA_SOCFPGA_F2SDR0,
113 		ALT_SYSMGR_NOC_F2SDR0_SET_MSK,
114 		ALT_RSTMGR_BRGMODRST_F2SSDRAM0_SET_MSK,
115 	},
116 	{
117 		COMPAT_ALTERA_SOCFPGA_F2SDR1,
118 		ALT_SYSMGR_NOC_F2SDR1_SET_MSK,
119 		ALT_RSTMGR_BRGMODRST_F2SSDRAM1_SET_MSK,
120 	},
121 	{
122 		COMPAT_ALTERA_SOCFPGA_F2SDR2,
123 		ALT_SYSMGR_NOC_F2SDR2_SET_MSK,
124 		ALT_RSTMGR_BRGMODRST_F2SSDRAM2_SET_MSK,
125 	},
126 };
127 
128 /* Disable the watchdog (toggle reset to watchdog) */
129 void socfpga_watchdog_disable(void)
130 {
131 	/* assert reset for watchdog */
132 	setbits_le32(&reset_manager_base->per1modrst,
133 		     ALT_RSTMGR_PER1MODRST_WD0_SET_MSK);
134 }
135 
136 /* Release NOC ddr scheduler from reset */
137 void socfpga_reset_deassert_noc_ddr_scheduler(void)
138 {
139 	clrbits_le32(&reset_manager_base->brgmodrst,
140 		     ALT_RSTMGR_BRGMODRST_DDRSCH_SET_MSK);
141 }
142 
143 /* Check whether Watchdog in reset state? */
144 int socfpga_is_wdt_in_reset(void)
145 {
146 	u32 val;
147 
148 	val = readl(&reset_manager_base->per1modrst);
149 	val &= ALT_RSTMGR_PER1MODRST_WD0_SET_MSK;
150 
151 	/* return 0x1 if watchdog in reset */
152 	return val;
153 }
154 
155 /* emacbase: base address of emac to enable/disable reset
156  * state: 0 - disable reset, !0 - enable reset
157  */
158 void socfpga_emac_manage_reset(ulong emacbase, u32 state)
159 {
160 	ulong eccmask;
161 	ulong emacmask;
162 
163 	switch (emacbase) {
164 	case SOCFPGA_EMAC0_ADDRESS:
165 		eccmask = ALT_RSTMGR_PER0MODRST_EMACECC0_SET_MSK;
166 		emacmask = ALT_RSTMGR_PER0MODRST_EMAC0_SET_MSK;
167 		break;
168 	case SOCFPGA_EMAC1_ADDRESS:
169 		eccmask = ALT_RSTMGR_PER0MODRST_EMACECC1_SET_MSK;
170 		emacmask = ALT_RSTMGR_PER0MODRST_EMAC1_SET_MSK;
171 		break;
172 	case SOCFPGA_EMAC2_ADDRESS:
173 		eccmask = ALT_RSTMGR_PER0MODRST_EMACECC2_SET_MSK;
174 		emacmask = ALT_RSTMGR_PER0MODRST_EMAC2_SET_MSK;
175 		break;
176 	default:
177 		pr_err("emac base address unexpected! %lx", emacbase);
178 		hang();
179 		break;
180 	}
181 
182 	if (state) {
183 		/* Enable ECC OCP first */
184 		setbits_le32(&reset_manager_base->per0modrst, eccmask);
185 		setbits_le32(&reset_manager_base->per0modrst, emacmask);
186 	} else {
187 		/* Disable ECC OCP first */
188 		clrbits_le32(&reset_manager_base->per0modrst, emacmask);
189 		clrbits_le32(&reset_manager_base->per0modrst, eccmask);
190 	}
191 }
192 
193 static int get_bridge_init_val(const void *blob, int compat_id)
194 {
195 	int node;
196 
197 	node = fdtdec_next_compatible(blob, 0, compat_id);
198 	if (node < 0)
199 		return 0;
200 
201 	return fdtdec_get_uint(blob, node, "init-val", 0);
202 }
203 
204 /* Enable bridges (hps2fpga, lwhps2fpga, fpga2hps, fpga2sdram) per handoff */
205 int socfpga_reset_deassert_bridges_handoff(void)
206 {
207 	u32 mask_noc = 0, mask_rstmgr = 0;
208 	int i;
209 
210 	for (i = 0; i < ARRAY_SIZE(bridge_cfg_tbl); i++) {
211 		if (get_bridge_init_val(gd->fdt_blob,
212 					bridge_cfg_tbl[i].compat_id)) {
213 			mask_noc |= bridge_cfg_tbl[i].mask_noc;
214 			mask_rstmgr |= bridge_cfg_tbl[i].mask_rstmgr;
215 		}
216 	}
217 
218 	/* clear idle request to all bridges */
219 	setbits_le32(&sysmgr_regs->noc_idlereq_clr, mask_noc);
220 
221 	/* Release bridges from reset state per handoff value */
222 	clrbits_le32(&reset_manager_base->brgmodrst, mask_rstmgr);
223 
224 	/* Poll until all idleack to 0, timeout at 1000ms */
225 	return wait_for_bit_le32(&sysmgr_regs->noc_idleack, mask_noc,
226 				 false, 1000, false);
227 }
228 
229 void socfpga_reset_assert_fpga_connected_peripherals(void)
230 {
231 	u32 mask0 = 0;
232 	u32 mask1 = 0;
233 	u32 fpga_pinux_addr = SOCFPGA_PINMUX_FPGA_INTERFACE_ADDRESS;
234 	int i;
235 
236 	for (i = 0; i < ARRAY_SIZE(per1fpgamasks); i++) {
237 		if (readl(fpga_pinux_addr)) {
238 			mask0 |= per0fpgamasks[i];
239 			mask1 |= per1fpgamasks[i];
240 		}
241 		fpga_pinux_addr += sizeof(u32);
242 	}
243 
244 	setbits_le32(&reset_manager_base->per0modrst, mask0 & ECC_MASK);
245 	setbits_le32(&reset_manager_base->per1modrst, mask1);
246 	setbits_le32(&reset_manager_base->per0modrst, mask0);
247 }
248 
249 /* Release L4 OSC1 Watchdog Timer 0 from reset through reset manager */
250 void socfpga_reset_deassert_osc1wd0(void)
251 {
252 	clrbits_le32(&reset_manager_base->per1modrst,
253 		     ALT_RSTMGR_PER1MODRST_WD0_SET_MSK);
254 }
255 
256 /*
257  * Assert or de-assert SoCFPGA reset manager reset.
258  */
259 void socfpga_per_reset(u32 reset, int set)
260 {
261 	const u32 *reg;
262 	u32 rstmgr_bank = RSTMGR_BANK(reset);
263 
264 	switch (rstmgr_bank) {
265 	case 0:
266 		reg = &reset_manager_base->mpumodrst;
267 		break;
268 	case 1:
269 		reg = &reset_manager_base->per0modrst;
270 		break;
271 	case 2:
272 		reg = &reset_manager_base->per1modrst;
273 		break;
274 	case 3:
275 		reg = &reset_manager_base->brgmodrst;
276 		break;
277 	case 4:
278 		reg = &reset_manager_base->sysmodrst;
279 		break;
280 
281 	default:
282 		return;
283 	}
284 
285 	if (set)
286 		setbits_le32(reg, 1 << RSTMGR_RESET(reset));
287 	else
288 		clrbits_le32(reg, 1 << RSTMGR_RESET(reset));
289 }
290 
291 /*
292  * Assert reset on every peripheral but L4WD0.
293  * Watchdog must be kept intact to prevent glitches
294  * and/or hangs.
295  * For the Arria10, we disable all the peripherals except L4 watchdog0,
296  * L4 Timer 0, and ECC.
297  */
298 void socfpga_per_reset_all(void)
299 {
300 	const u32 l4wd0 = (1 << RSTMGR_RESET(SOCFPGA_RESET(L4WD0)) |
301 			  (1 << RSTMGR_RESET(SOCFPGA_RESET(L4SYSTIMER0))));
302 	unsigned mask_ecc_ocp =
303 		ALT_RSTMGR_PER0MODRST_EMACECC0_SET_MSK |
304 		ALT_RSTMGR_PER0MODRST_EMACECC1_SET_MSK |
305 		ALT_RSTMGR_PER0MODRST_EMACECC2_SET_MSK |
306 		ALT_RSTMGR_PER0MODRST_USBECC0_SET_MSK |
307 		ALT_RSTMGR_PER0MODRST_USBECC1_SET_MSK |
308 		ALT_RSTMGR_PER0MODRST_NANDECC_SET_MSK |
309 		ALT_RSTMGR_PER0MODRST_QSPIECC_SET_MSK |
310 		ALT_RSTMGR_PER0MODRST_SDMMCECC_SET_MSK;
311 
312 	/* disable all components except ECC_OCP, L4 Timer0 and L4 WD0 */
313 	writel(~l4wd0, &reset_manager_base->per1modrst);
314 	setbits_le32(&reset_manager_base->per0modrst, ~mask_ecc_ocp);
315 
316 	/* Finally disable the ECC_OCP */
317 	setbits_le32(&reset_manager_base->per0modrst, mask_ecc_ocp);
318 }
319 
320 #if defined(CONFIG_SOCFPGA_VIRTUAL_TARGET)
321 int socfpga_bridges_reset(void)
322 {
323 	/* For SoCFPGA-VT, this is NOP. */
324 	return 0;
325 }
326 #else
327 int socfpga_bridges_reset(void)
328 {
329 	int ret;
330 
331 	/* Disable all the bridges (hps2fpga, lwhps2fpga, fpga2hps,
332 	   fpga2sdram) */
333 	/* set idle request to all bridges */
334 	writel(ALT_SYSMGR_NOC_H2F_SET_MSK |
335 		ALT_SYSMGR_NOC_LWH2F_SET_MSK |
336 		ALT_SYSMGR_NOC_F2H_SET_MSK |
337 		ALT_SYSMGR_NOC_F2SDR0_SET_MSK |
338 		ALT_SYSMGR_NOC_F2SDR1_SET_MSK |
339 		ALT_SYSMGR_NOC_F2SDR2_SET_MSK,
340 		&sysmgr_regs->noc_idlereq_set);
341 
342 	/* Enable the NOC timeout */
343 	writel(ALT_SYSMGR_NOC_TMO_EN_SET_MSK, &sysmgr_regs->noc_timeout);
344 
345 	/* Poll until all idleack to 1 */
346 	ret = wait_for_bit_le32(&sysmgr_regs->noc_idleack,
347 				ALT_SYSMGR_NOC_H2F_SET_MSK |
348 				ALT_SYSMGR_NOC_LWH2F_SET_MSK |
349 				ALT_SYSMGR_NOC_F2H_SET_MSK |
350 				ALT_SYSMGR_NOC_F2SDR0_SET_MSK |
351 				ALT_SYSMGR_NOC_F2SDR1_SET_MSK |
352 				ALT_SYSMGR_NOC_F2SDR2_SET_MSK,
353 				true, 10000, false);
354 	if (ret)
355 		return ret;
356 
357 	/* Poll until all idlestatus to 1 */
358 	ret = wait_for_bit_le32(&sysmgr_regs->noc_idlestatus,
359 				ALT_SYSMGR_NOC_H2F_SET_MSK |
360 				ALT_SYSMGR_NOC_LWH2F_SET_MSK |
361 				ALT_SYSMGR_NOC_F2H_SET_MSK |
362 				ALT_SYSMGR_NOC_F2SDR0_SET_MSK |
363 				ALT_SYSMGR_NOC_F2SDR1_SET_MSK |
364 				ALT_SYSMGR_NOC_F2SDR2_SET_MSK,
365 				true, 10000, false);
366 	if (ret)
367 		return ret;
368 
369 	/* Put all bridges (except NOR DDR scheduler) into reset state */
370 	setbits_le32(&reset_manager_base->brgmodrst,
371 		     (ALT_RSTMGR_BRGMODRST_H2F_SET_MSK |
372 		     ALT_RSTMGR_BRGMODRST_LWH2F_SET_MSK |
373 		     ALT_RSTMGR_BRGMODRST_F2H_SET_MSK |
374 		     ALT_RSTMGR_BRGMODRST_F2SSDRAM0_SET_MSK |
375 		     ALT_RSTMGR_BRGMODRST_F2SSDRAM1_SET_MSK |
376 		     ALT_RSTMGR_BRGMODRST_F2SSDRAM2_SET_MSK));
377 
378 	/* Disable NOC timeout */
379 	writel(0, &sysmgr_regs->noc_timeout);
380 
381 	return 0;
382 }
383 #endif
384