1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * arch/powerpc/boot/ugecon.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * USB Gecko bootwrapper console.
6*4882a593Smuzhiyun * Copyright (C) 2008-2009 The GameCube Linux Team
7*4882a593Smuzhiyun * Copyright (C) 2008,2009 Albert Herranz
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <stddef.h>
11*4882a593Smuzhiyun #include "stdio.h"
12*4882a593Smuzhiyun #include "types.h"
13*4882a593Smuzhiyun #include "io.h"
14*4882a593Smuzhiyun #include "ops.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define EXI_CLK_32MHZ 5
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define EXI_CSR 0x00
20*4882a593Smuzhiyun #define EXI_CSR_CLKMASK (0x7<<4)
21*4882a593Smuzhiyun #define EXI_CSR_CLK_32MHZ (EXI_CLK_32MHZ<<4)
22*4882a593Smuzhiyun #define EXI_CSR_CSMASK (0x7<<7)
23*4882a593Smuzhiyun #define EXI_CSR_CS_0 (0x1<<7) /* Chip Select 001 */
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #define EXI_CR 0x0c
26*4882a593Smuzhiyun #define EXI_CR_TSTART (1<<0)
27*4882a593Smuzhiyun #define EXI_CR_WRITE (1<<2)
28*4882a593Smuzhiyun #define EXI_CR_READ_WRITE (2<<2)
29*4882a593Smuzhiyun #define EXI_CR_TLEN(len) (((len)-1)<<4)
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun #define EXI_DATA 0x10
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /* virtual address base for input/output, retrieved from device tree */
35*4882a593Smuzhiyun static void *ug_io_base;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun
ug_io_transaction(u32 in)38*4882a593Smuzhiyun static u32 ug_io_transaction(u32 in)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun u32 *csr_reg = ug_io_base + EXI_CSR;
41*4882a593Smuzhiyun u32 *data_reg = ug_io_base + EXI_DATA;
42*4882a593Smuzhiyun u32 *cr_reg = ug_io_base + EXI_CR;
43*4882a593Smuzhiyun u32 csr, data, cr;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun /* select */
46*4882a593Smuzhiyun csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0;
47*4882a593Smuzhiyun out_be32(csr_reg, csr);
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /* read/write */
50*4882a593Smuzhiyun data = in;
51*4882a593Smuzhiyun out_be32(data_reg, data);
52*4882a593Smuzhiyun cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART;
53*4882a593Smuzhiyun out_be32(cr_reg, cr);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun while (in_be32(cr_reg) & EXI_CR_TSTART)
56*4882a593Smuzhiyun barrier();
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /* deselect */
59*4882a593Smuzhiyun out_be32(csr_reg, 0);
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun data = in_be32(data_reg);
62*4882a593Smuzhiyun return data;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
ug_is_txfifo_ready(void)65*4882a593Smuzhiyun static int ug_is_txfifo_ready(void)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun return ug_io_transaction(0xc0000000) & 0x04000000;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
ug_raw_putc(char ch)70*4882a593Smuzhiyun static void ug_raw_putc(char ch)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun ug_io_transaction(0xb0000000 | (ch << 20));
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
ug_putc(char ch)75*4882a593Smuzhiyun static void ug_putc(char ch)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun int count = 16;
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun if (!ug_io_base)
80*4882a593Smuzhiyun return;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun while (!ug_is_txfifo_ready() && count--)
83*4882a593Smuzhiyun barrier();
84*4882a593Smuzhiyun if (count >= 0)
85*4882a593Smuzhiyun ug_raw_putc(ch);
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
ug_console_write(const char * buf,int len)88*4882a593Smuzhiyun void ug_console_write(const char *buf, int len)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun char *b = (char *)buf;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun while (len--) {
93*4882a593Smuzhiyun if (*b == '\n')
94*4882a593Smuzhiyun ug_putc('\r');
95*4882a593Smuzhiyun ug_putc(*b++);
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
ug_is_adapter_present(void)99*4882a593Smuzhiyun static int ug_is_adapter_present(void)
100*4882a593Smuzhiyun {
101*4882a593Smuzhiyun if (!ug_io_base)
102*4882a593Smuzhiyun return 0;
103*4882a593Smuzhiyun return ug_io_transaction(0x90000000) == 0x04700000;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
ug_grab_exi_io_base(void)106*4882a593Smuzhiyun static void *ug_grab_exi_io_base(void)
107*4882a593Smuzhiyun {
108*4882a593Smuzhiyun u32 v;
109*4882a593Smuzhiyun void *devp;
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun devp = find_node_by_compatible(NULL, "nintendo,flipper-exi");
112*4882a593Smuzhiyun if (devp == NULL)
113*4882a593Smuzhiyun goto err_out;
114*4882a593Smuzhiyun if (getprop(devp, "virtual-reg", &v, sizeof(v)) != sizeof(v))
115*4882a593Smuzhiyun goto err_out;
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun return (void *)v;
118*4882a593Smuzhiyun
119*4882a593Smuzhiyun err_out:
120*4882a593Smuzhiyun return NULL;
121*4882a593Smuzhiyun }
122*4882a593Smuzhiyun
ug_probe(void)123*4882a593Smuzhiyun void *ug_probe(void)
124*4882a593Smuzhiyun {
125*4882a593Smuzhiyun void *exi_io_base;
126*4882a593Smuzhiyun int i;
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun exi_io_base = ug_grab_exi_io_base();
129*4882a593Smuzhiyun if (!exi_io_base)
130*4882a593Smuzhiyun return NULL;
131*4882a593Smuzhiyun
132*4882a593Smuzhiyun /* look for a usbgecko on memcard slots A and B */
133*4882a593Smuzhiyun for (i = 0; i < 2; i++) {
134*4882a593Smuzhiyun ug_io_base = exi_io_base + 0x14 * i;
135*4882a593Smuzhiyun if (ug_is_adapter_present())
136*4882a593Smuzhiyun break;
137*4882a593Smuzhiyun }
138*4882a593Smuzhiyun if (i == 2)
139*4882a593Smuzhiyun ug_io_base = NULL;
140*4882a593Smuzhiyun return ug_io_base;
141*4882a593Smuzhiyun }
142*4882a593Smuzhiyun
143