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