1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (c) Copyright 2010-2017 Xilinx, Inc. All rights reserved.
4 * (c) Copyright 2016 Topic Embedded Products.
5 */
6
7#include <asm/io.h>
8#include <asm/spl.h>
9#include <asm/arch/sys_proto.h>
10#include <asm/arch/ps7_init_gpl.h>
11
12__weak int ps7_init(void)
13{
14	/*
15	 * This function is overridden by the one in
16	 * board/xilinx/zynq/(platform)/ps7_init_gpl.c, if it exists.
17	 */
18	return 0;
19}
20
21__weak int ps7_post_config(void)
22{
23	/*
24	 * This function is overridden by the one in
25	 * board/xilinx/zynq/(platform)/ps7_init_gpl.c, if it exists.
26	 */
27	return 0;
28}
29
30/* For delay calculation using global registers*/
31#define SCU_GLOBAL_TIMER_COUNT_L32	0xF8F00200
32#define SCU_GLOBAL_TIMER_COUNT_U32	0xF8F00204
33#define SCU_GLOBAL_TIMER_CONTROL	0xF8F00208
34#define SCU_GLOBAL_TIMER_AUTO_INC	0xF8F00218
35#define APU_FREQ  666666666
36
37#define PS7_MASK_POLL_TIME 100000000
38
39/* IO accessors. No memory barriers desired. */
40static inline void iowrite(unsigned long val, unsigned long addr)
41{
42	__raw_writel(val, addr);
43}
44
45static inline unsigned long ioread(unsigned long addr)
46{
47	return __raw_readl(addr);
48}
49
50/* start timer */
51static void perf_start_clock(void)
52{
53	iowrite((1 << 0) | /* Timer Enable */
54		(1 << 3) | /* Auto-increment */
55		(0 << 8), /* Pre-scale */
56		SCU_GLOBAL_TIMER_CONTROL);
57}
58
59/* Compute mask for given delay in miliseconds*/
60static unsigned long get_number_of_cycles_for_delay(unsigned long delay)
61{
62	return (APU_FREQ / (2 * 1000)) * delay;
63}
64
65/* stop timer */
66static void perf_disable_clock(void)
67{
68	iowrite(0, SCU_GLOBAL_TIMER_CONTROL);
69}
70
71/* stop timer and reset timer count regs */
72static void perf_reset_clock(void)
73{
74	perf_disable_clock();
75	iowrite(0, SCU_GLOBAL_TIMER_COUNT_L32);
76	iowrite(0, SCU_GLOBAL_TIMER_COUNT_U32);
77}
78
79static void perf_reset_and_start_timer(void)
80{
81	perf_reset_clock();
82	perf_start_clock();
83}
84
85int __weak ps7_config(unsigned long *ps7_config_init)
86{
87	unsigned long *ptr = ps7_config_init;
88	unsigned long opcode;
89	unsigned long addr;
90	unsigned long val;
91	unsigned long mask;
92	unsigned int numargs;
93	int i;
94	unsigned long delay;
95
96	for (;;) {
97		opcode = ptr[0];
98		if (opcode == OPCODE_EXIT)
99			return PS7_INIT_SUCCESS;
100		addr = (opcode & OPCODE_ADDRESS_MASK);
101
102		switch (opcode & ~OPCODE_ADDRESS_MASK) {
103		case OPCODE_MASKWRITE:
104			numargs = 3;
105			mask = ptr[1];
106			val = ptr[2];
107			iowrite((ioread(addr) & ~mask) | (val & mask), addr);
108			break;
109
110		case OPCODE_WRITE:
111			numargs = 2;
112			val = ptr[1];
113			iowrite(val, addr);
114			break;
115
116		case OPCODE_MASKPOLL:
117			numargs = 2;
118			mask = ptr[1];
119			i = 0;
120			while (!(ioread(addr) & mask)) {
121				if (i == PS7_MASK_POLL_TIME)
122					return PS7_INIT_TIMEOUT;
123				i++;
124			}
125			break;
126
127		case OPCODE_MASKDELAY:
128			numargs = 2;
129			mask = ptr[1];
130			delay = get_number_of_cycles_for_delay(mask);
131			perf_reset_and_start_timer();
132			while (ioread(addr) < delay)
133				;
134			break;
135
136		default:
137			return PS7_INIT_CORRUPT;
138		}
139
140		ptr += numargs;
141	}
142}
143
144unsigned long __weak __maybe_unused ps7GetSiliconVersion(void)
145{
146	return zynq_get_silicon_version();
147}
148