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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * arch/powerpc/boot/ugecon.c
4 *
5 * USB Gecko bootwrapper console.
6 * Copyright (C) 2008-2009 The GameCube Linux Team
7 * Copyright (C) 2008,2009 Albert Herranz
8 */
9
10#include <stddef.h>
11#include "stdio.h"
12#include "types.h"
13#include "io.h"
14#include "ops.h"
15
16
17#define EXI_CLK_32MHZ 5
18
19#define EXI_CSR 0x00
20#define EXI_CSR_CLKMASK (0x7<<4)
21#define EXI_CSR_CLK_32MHZ (EXI_CLK_32MHZ<<4)
22#define EXI_CSR_CSMASK (0x7<<7)
23#define EXI_CSR_CS_0 (0x1<<7) /* Chip Select 001 */
24
25#define EXI_CR 0x0c
26#define EXI_CR_TSTART (1<<0)
27#define EXI_CR_WRITE (1<<2)
28#define EXI_CR_READ_WRITE (2<<2)
29#define EXI_CR_TLEN(len) (((len)-1)<<4)
30
31#define EXI_DATA 0x10
32
33
34/* virtual address base for input/output, retrieved from device tree */
35static void *ug_io_base;
36
37
38static u32 ug_io_transaction(u32 in)
39{
40 u32 *csr_reg = ug_io_base + EXI_CSR;
41 u32 *data_reg = ug_io_base + EXI_DATA;
42 u32 *cr_reg = ug_io_base + EXI_CR;
43 u32 csr, data, cr;
44
45 /* select */
46 csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0;
47 out_be32(csr_reg, csr);
48
49 /* read/write */
50 data = in;
51 out_be32(data_reg, data);
52 cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART;
53 out_be32(cr_reg, cr);
54
55 while (in_be32(cr_reg) & EXI_CR_TSTART)
56 barrier();
57
58 /* deselect */
59 out_be32(csr_reg, 0);
60
61 data = in_be32(data_reg);
62 return data;
63}
64
65static int ug_is_txfifo_ready(void)
66{
67 return ug_io_transaction(0xc0000000) & 0x04000000;
68}
69
70static void ug_raw_putc(char ch)
71{
72 ug_io_transaction(0xb0000000 | (ch << 20));
73}
74
75static void ug_putc(char ch)
76{
77 int count = 16;
78
79 if (!ug_io_base)
80 return;
81
82 while (!ug_is_txfifo_ready() && count--)
83 barrier();
84 if (count >= 0)
85 ug_raw_putc(ch);
86}
87
88void ug_console_write(const char *buf, int len)
89{
90 char *b = (char *)buf;
91
92 while (len--) {
93 if (*b == '\n')
94 ug_putc('\r');
95 ug_putc(*b++);
96 }
97}
98
99static int ug_is_adapter_present(void)
100{
101 if (!ug_io_base)
102 return 0;
103 return ug_io_transaction(0x90000000) == 0x04700000;
104}
105
106static void *ug_grab_exi_io_base(void)
107{
108 u32 v;
109 void *devp;
110
111 devp = find_node_by_compatible(NULL, "nintendo,flipper-exi");
112 if (devp == NULL)
113 goto err_out;
114 if (getprop(devp, "virtual-reg", &v, sizeof(v)) != sizeof(v))
115 goto err_out;
116
117 return (void *)v;
118
119err_out:
120 return NULL;
121}
122
123void *ug_probe(void)
124{
125 void *exi_io_base;
126 int i;
127
128 exi_io_base = ug_grab_exi_io_base();
129 if (!exi_io_base)
130 return NULL;
131
132 /* look for a usbgecko on memcard slots A and B */
133 for (i = 0; i < 2; i++) {
134 ug_io_base = exi_io_base + 0x14 * i;
135 if (ug_is_adapter_present())
136 break;
137 }
138 if (i == 2)
139 ug_io_base = NULL;
140 return ug_io_base;
141}
142
1/*
2 * arch/powerpc/boot/ugecon.c
3 *
4 * USB Gecko bootwrapper console.
5 * Copyright (C) 2008-2009 The GameCube Linux Team
6 * Copyright (C) 2008,2009 Albert Herranz
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 */
14
15#include <stddef.h>
16#include "stdio.h"
17#include "types.h"
18#include "io.h"
19#include "ops.h"
20
21
22#define EXI_CLK_32MHZ 5
23
24#define EXI_CSR 0x00
25#define EXI_CSR_CLKMASK (0x7<<4)
26#define EXI_CSR_CLK_32MHZ (EXI_CLK_32MHZ<<4)
27#define EXI_CSR_CSMASK (0x7<<7)
28#define EXI_CSR_CS_0 (0x1<<7) /* Chip Select 001 */
29
30#define EXI_CR 0x0c
31#define EXI_CR_TSTART (1<<0)
32#define EXI_CR_WRITE (1<<2)
33#define EXI_CR_READ_WRITE (2<<2)
34#define EXI_CR_TLEN(len) (((len)-1)<<4)
35
36#define EXI_DATA 0x10
37
38
39/* virtual address base for input/output, retrieved from device tree */
40static void *ug_io_base;
41
42
43static u32 ug_io_transaction(u32 in)
44{
45 u32 *csr_reg = ug_io_base + EXI_CSR;
46 u32 *data_reg = ug_io_base + EXI_DATA;
47 u32 *cr_reg = ug_io_base + EXI_CR;
48 u32 csr, data, cr;
49
50 /* select */
51 csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0;
52 out_be32(csr_reg, csr);
53
54 /* read/write */
55 data = in;
56 out_be32(data_reg, data);
57 cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART;
58 out_be32(cr_reg, cr);
59
60 while (in_be32(cr_reg) & EXI_CR_TSTART)
61 barrier();
62
63 /* deselect */
64 out_be32(csr_reg, 0);
65
66 data = in_be32(data_reg);
67 return data;
68}
69
70static int ug_is_txfifo_ready(void)
71{
72 return ug_io_transaction(0xc0000000) & 0x04000000;
73}
74
75static void ug_raw_putc(char ch)
76{
77 ug_io_transaction(0xb0000000 | (ch << 20));
78}
79
80static void ug_putc(char ch)
81{
82 int count = 16;
83
84 if (!ug_io_base)
85 return;
86
87 while (!ug_is_txfifo_ready() && count--)
88 barrier();
89 if (count >= 0)
90 ug_raw_putc(ch);
91}
92
93void ug_console_write(const char *buf, int len)
94{
95 char *b = (char *)buf;
96
97 while (len--) {
98 if (*b == '\n')
99 ug_putc('\r');
100 ug_putc(*b++);
101 }
102}
103
104static int ug_is_adapter_present(void)
105{
106 if (!ug_io_base)
107 return 0;
108 return ug_io_transaction(0x90000000) == 0x04700000;
109}
110
111static void *ug_grab_exi_io_base(void)
112{
113 u32 v;
114 void *devp;
115
116 devp = find_node_by_compatible(NULL, "nintendo,flipper-exi");
117 if (devp == NULL)
118 goto err_out;
119 if (getprop(devp, "virtual-reg", &v, sizeof(v)) != sizeof(v))
120 goto err_out;
121
122 return (void *)v;
123
124err_out:
125 return NULL;
126}
127
128void *ug_probe(void)
129{
130 void *exi_io_base;
131 int i;
132
133 exi_io_base = ug_grab_exi_io_base();
134 if (!exi_io_base)
135 return NULL;
136
137 /* look for a usbgecko on memcard slots A and B */
138 for (i = 0; i < 2; i++) {
139 ug_io_base = exi_io_base + 0x14 * i;
140 if (ug_is_adapter_present())
141 break;
142 }
143 if (i == 2)
144 ug_io_base = NULL;
145 return ug_io_base;
146}
147