143 lines
2.6 KiB
C
143 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* arch/powerpc/boot/ugecon.c
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*
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* USB Gecko bootwrapper console.
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* Copyright (C) 2008-2009 The GameCube Linux Team
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* Copyright (C) 2008,2009 Albert Herranz
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*/
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#include <stddef.h>
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#include "stdio.h"
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#include "types.h"
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#include "io.h"
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#include "ops.h"
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#define EXI_CLK_32MHZ 5
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#define EXI_CSR 0x00
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#define EXI_CSR_CLKMASK (0x7<<4)
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#define EXI_CSR_CLK_32MHZ (EXI_CLK_32MHZ<<4)
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#define EXI_CSR_CSMASK (0x7<<7)
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#define EXI_CSR_CS_0 (0x1<<7) /* Chip Select 001 */
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#define EXI_CR 0x0c
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#define EXI_CR_TSTART (1<<0)
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#define EXI_CR_WRITE (1<<2)
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#define EXI_CR_READ_WRITE (2<<2)
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#define EXI_CR_TLEN(len) (((len)-1)<<4)
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#define EXI_DATA 0x10
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/* virtual address base for input/output, retrieved from device tree */
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static void *ug_io_base;
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static u32 ug_io_transaction(u32 in)
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{
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u32 *csr_reg = ug_io_base + EXI_CSR;
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u32 *data_reg = ug_io_base + EXI_DATA;
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u32 *cr_reg = ug_io_base + EXI_CR;
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u32 csr, data, cr;
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/* select */
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csr = EXI_CSR_CLK_32MHZ | EXI_CSR_CS_0;
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out_be32(csr_reg, csr);
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/* read/write */
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data = in;
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out_be32(data_reg, data);
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cr = EXI_CR_TLEN(2) | EXI_CR_READ_WRITE | EXI_CR_TSTART;
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out_be32(cr_reg, cr);
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while (in_be32(cr_reg) & EXI_CR_TSTART)
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barrier();
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/* deselect */
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out_be32(csr_reg, 0);
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data = in_be32(data_reg);
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return data;
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}
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static int ug_is_txfifo_ready(void)
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{
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return ug_io_transaction(0xc0000000) & 0x04000000;
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}
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static void ug_raw_putc(char ch)
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{
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ug_io_transaction(0xb0000000 | (ch << 20));
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}
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static void ug_putc(char ch)
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{
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int count = 16;
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if (!ug_io_base)
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return;
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while (!ug_is_txfifo_ready() && count--)
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barrier();
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if (count >= 0)
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ug_raw_putc(ch);
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}
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void ug_console_write(const char *buf, int len)
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{
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char *b = (char *)buf;
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while (len--) {
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if (*b == '\n')
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ug_putc('\r');
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ug_putc(*b++);
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}
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}
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static int ug_is_adapter_present(void)
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{
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if (!ug_io_base)
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return 0;
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return ug_io_transaction(0x90000000) == 0x04700000;
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}
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static void *ug_grab_exi_io_base(void)
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{
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u32 v;
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void *devp;
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devp = find_node_by_compatible(NULL, "nintendo,flipper-exi");
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if (devp == NULL)
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goto err_out;
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if (getprop(devp, "virtual-reg", &v, sizeof(v)) != sizeof(v))
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goto err_out;
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return (void *)v;
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err_out:
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return NULL;
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}
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void *ug_probe(void)
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{
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void *exi_io_base;
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int i;
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exi_io_base = ug_grab_exi_io_base();
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if (!exi_io_base)
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return NULL;
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/* look for a usbgecko on memcard slots A and B */
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for (i = 0; i < 2; i++) {
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ug_io_base = exi_io_base + 0x14 * i;
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if (ug_is_adapter_present())
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break;
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}
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if (i == 2)
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ug_io_base = NULL;
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return ug_io_base;
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}
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