1 // SPDX-License-Identifier: GPL-2.0+
2 /**
3  * Copyright 2010-2011 Freescale Semiconductor
4  * Author: Timur Tabi <timur@freescale.com>
5  *
6  * This file provides support for the ngPIXIS, a board-specific FPGA used on
7  * some Freescale reference boards.
8  *
9  * A "switch" is black rectangular block on the motherboard.  It contains
10  * eight "bits".  The ngPIXIS has a set of memory-mapped registers (SWx) that
11  * shadow the actual physical switches.  There is also another set of
12  * registers (ENx) that tell the ngPIXIS which bits of SWx should actually be
13  * used to override the values of the bits in the physical switches.
14  *
15  * The following macros need to be defined:
16  *
17  * PIXIS_BASE - The virtual address of the base of the PIXIS register map
18  *
19  * PIXIS_LBMAP_SWITCH - The switch number (i.e. the "x" in "SWx"). This value
20  *    is used in the PIXIS_SW() macro to determine which offset in
21  *    the PIXIS register map corresponds to the physical switch that controls
22  *    the boot bank.
23  *
24  * PIXIS_LBMAP_MASK - A bit mask the defines which bits in SWx to use.
25  *
26  * PIXIS_LBMAP_SHIFT - The shift value that corresponds to PIXIS_LBMAP_MASK.
27  *
28  * PIXIS_LBMAP_ALTBANK - The value to program into SWx to tell the ngPIXIS to
29  *    boot from the alternate bank.
30  */
31 
32 #include <common.h>
33 #include <command.h>
34 #include <asm/io.h>
35 
36 #include "ngpixis.h"
37 
__pixis_read(unsigned int reg)38 static u8 __pixis_read(unsigned int reg)
39 {
40 	void *p = (void *)PIXIS_BASE;
41 
42 	return in_8(p + reg);
43 }
44 u8 pixis_read(unsigned int reg) __attribute__((weak, alias("__pixis_read")));
45 
__pixis_write(unsigned int reg,u8 value)46 static void __pixis_write(unsigned int reg, u8 value)
47 {
48 	void *p = (void *)PIXIS_BASE;
49 
50 	out_8(p + reg, value);
51 }
52 void pixis_write(unsigned int reg, u8 value)
53 	__attribute__((weak, alias("__pixis_write")));
54 
55 /*
56  * Reset the board. This ignores the ENx registers.
57  */
__pixis_reset(void)58 void __pixis_reset(void)
59 {
60 	PIXIS_WRITE(rst, 0);
61 
62 	while (1);
63 }
64 void pixis_reset(void) __attribute__((weak, alias("__pixis_reset")));
65 
66 /*
67  * Reset the board.  Like pixis_reset(), but it honors the ENx registers.
68  */
__pixis_bank_reset(void)69 void __pixis_bank_reset(void)
70 {
71 	PIXIS_WRITE(vctl, 0);
72 	PIXIS_WRITE(vctl, 1);
73 
74 	while (1);
75 }
76 void pixis_bank_reset(void) __attribute__((weak, alias("__pixis_bank_reset")));
77 
78 /**
79  * Set the boot bank to the power-on default bank
80  */
__clear_altbank(void)81 void __clear_altbank(void)
82 {
83 	u8 reg;
84 
85 	/* Tell the ngPIXIS to use this the bits in the physical switch for the
86 	 * boot bank value, instead of the SWx register.  We need to be careful
87 	 * only to set the bits in SWx that correspond to the boot bank.
88 	 */
89 	reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].en);
90 	reg &= ~PIXIS_LBMAP_MASK;
91 	PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].en, reg);
92 }
93 void clear_altbank(void) __attribute__((weak, alias("__clear_altbank")));
94 
95 /**
96  * Set the boot bank to the alternate bank
97  */
__set_altbank(void)98 void __set_altbank(void)
99 {
100 	u8 reg;
101 
102 	/* Program the alternate bank number into the SWx register.
103 	 */
104 	reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].sw);
105 	reg = (reg & ~PIXIS_LBMAP_MASK) | PIXIS_LBMAP_ALTBANK;
106 	PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].sw, reg);
107 
108 	/* Tell the ngPIXIS to use this the bits in the SWx register for the
109 	 * boot bank value, instead of the physical switch.  We need to be
110 	 * careful only to set the bits in SWx that correspond to the boot bank.
111 	 */
112 	reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].en);
113 	reg |= PIXIS_LBMAP_MASK;
114 	PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].en, reg);
115 }
116 void set_altbank(void) __attribute__((weak, alias("__set_altbank")));
117 
118 #ifdef DEBUG
pixis_dump_regs(void)119 static void pixis_dump_regs(void)
120 {
121 	unsigned int i;
122 
123 	printf("id=%02x\n", PIXIS_READ(id));
124 	printf("arch=%02x\n", PIXIS_READ(arch));
125 	printf("scver=%02x\n", PIXIS_READ(scver));
126 	printf("csr=%02x\n", PIXIS_READ(csr));
127 	printf("rst=%02x\n", PIXIS_READ(rst));
128 	printf("aux=%02x\n", PIXIS_READ(aux));
129 	printf("spd=%02x\n", PIXIS_READ(spd));
130 	printf("brdcfg0=%02x\n", PIXIS_READ(brdcfg0));
131 	printf("brdcfg1=%02x\n", PIXIS_READ(brdcfg1));
132 	printf("addr=%02x\n", PIXIS_READ(addr));
133 	printf("data=%02x\n", PIXIS_READ(data));
134 	printf("led=%02x\n", PIXIS_READ(led));
135 	printf("vctl=%02x\n", PIXIS_READ(vctl));
136 	printf("vstat=%02x\n", PIXIS_READ(vstat));
137 	printf("vcfgen0=%02x\n", PIXIS_READ(vcfgen0));
138 	printf("ocmcsr=%02x\n", PIXIS_READ(ocmcsr));
139 	printf("ocmmsg=%02x\n", PIXIS_READ(ocmmsg));
140 	printf("gmdbg=%02x\n", PIXIS_READ(gmdbg));
141 	printf("sclk=%02x%02x%02x\n",
142 	       PIXIS_READ(sclk[0]), PIXIS_READ(sclk[1]), PIXIS_READ(sclk[2]));
143 	printf("dclk=%02x%02x%02x\n",
144 	       PIXIS_READ(dclk[0]), PIXIS_READ(dclk[1]), PIXIS_READ(dclk[2]));
145 	printf("watch=%02x\n", PIXIS_READ(watch));
146 
147 	for (i = 0; i < 8; i++) {
148 		printf("SW%u=%02x/%02x ", i + 1,
149 			PIXIS_READ(s[i].sw), PIXIS_READ(s[i].en));
150 	}
151 	putc('\n');
152 }
153 #endif
154 
pixis_sysclk_set(unsigned long sysclk)155 void pixis_sysclk_set(unsigned long sysclk)
156 {
157 	unsigned long freq_word;
158 	u8 sclk0, sclk1, sclk2;
159 
160 	freq_word = ics307_sysclk_calculator(sysclk);
161 	sclk2 = freq_word & 0xff;
162 	sclk1 = (freq_word >> 8) & 0xff;
163 	sclk0 = (freq_word >> 16) & 0xff;
164 
165 	/* set SYSCLK enable bit */
166 	PIXIS_WRITE(vcfgen0, 0x01);
167 
168 	/* SYSCLK to required frequency */
169 	PIXIS_WRITE(sclk[0], sclk0);
170 	PIXIS_WRITE(sclk[1], sclk1);
171 	PIXIS_WRITE(sclk[2], sclk2);
172 }
173 
pixis_reset_cmd(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])174 int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
175 {
176 	unsigned int i;
177 	unsigned long sysclk;
178 	char *p_altbank = NULL;
179 #ifdef DEBUG
180 	char *p_dump = NULL;
181 #endif
182 	char *unknown_param = NULL;
183 
184 	/* No args is a simple reset request.
185 	 */
186 	if (argc <= 1)
187 		pixis_reset();
188 
189 	for (i = 1; i < argc; i++) {
190 		if (strcmp(argv[i], "altbank") == 0) {
191 			p_altbank = argv[i];
192 			continue;
193 		}
194 
195 #ifdef DEBUG
196 		if (strcmp(argv[i], "dump") == 0) {
197 			p_dump = argv[i];
198 			continue;
199 		}
200 #endif
201 		if (strcmp(argv[i], "sysclk") == 0) {
202 			sysclk = simple_strtoul(argv[i + 1], NULL, 0);
203 			i += 1;
204 			pixis_sysclk_set(sysclk);
205 			continue;
206 		}
207 
208 		unknown_param = argv[i];
209 	}
210 
211 	if (unknown_param) {
212 		printf("Invalid option: %s\n", unknown_param);
213 		return 1;
214 	}
215 
216 #ifdef DEBUG
217 	if (p_dump) {
218 		pixis_dump_regs();
219 
220 		/* 'dump' ignores other commands */
221 		return 0;
222 	}
223 #endif
224 
225 	if (p_altbank)
226 		set_altbank();
227 	else
228 		clear_altbank();
229 
230 	pixis_bank_reset();
231 
232 	/* Shouldn't be reached. */
233 	return 0;
234 }
235 
236 #ifdef CONFIG_SYS_LONGHELP
237 static char pixis_help_text[] =
238 	"- hard reset to default bank\n"
239 	"pixis_reset altbank - reset to alternate bank\n"
240 #ifdef DEBUG
241 	"pixis_reset dump - display the PIXIS registers\n"
242 #endif
243 	"pixis_reset sysclk <SYSCLK_freq> - reset with SYSCLK frequency(KHz)\n";
244 #endif
245 
246 U_BOOT_CMD(
247 	pixis_reset, CONFIG_SYS_MAXARGS, 1, pixis_reset_cmd,
248 	"Reset the board using the FPGA sequencer", pixis_help_text
249 	);
250