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