mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-11-01 00:55:06 +01:00
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
#include "exi.h"
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#include "usbgecko.h"
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#include "types.h"
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#define USBGECKO_CMD_IDENTIFY 0x90000000
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#define USBGECKO_IDENTIFY_RESPONSE 0x04700000
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#define USBGECKO_CMD_TX_STATUS 0xc0000000
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#define USBGECKO_TX_FIFO_READY 0x04000000
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#define USBGECKO_CMD_RX_STATUS 0xd0000000
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#define USBGECKO_RX_FIFO_READY 0x04000000
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#define USBGECKO_CMD_RECEIVE 0xa0000000
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#define USBGECKO_CMD_TRANSMIT(ch) (0xb0000000 | ((ch) << 20))
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static int usb_gecko_channel = -1;
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static u32 usbgecko_transaction(int ch, u32 data)
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{
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volatile void* exi_base = (volatile void*)EXI_ADDR(ch);
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/* 5.9.1.2: Selecting a specific EXI device: select the USB Gecko device */
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*(vu32*)(exi_base + EXI_CSR) = EXI_CSR_CLK_32MHZ | EXI_CSR_CS(1);
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/* 5.9.1.4: Perform IMM operation: setup data */
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*(vu32*)(exi_base + EXI_DATA) = data;
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/* 5.9.1.4: Perform IMM operation: schedule read/write; 2 bytes; start now */
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*(vu32*)(exi_base + EXI_CR) = EXI_CR_TLEN_2 | EXI_CR_RW_RW | EXI_CR_TSTART;
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/* 5.9.1.4: Perform IMM operation: Wait until transfer is completed */
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while (1) {
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if ((*(vu32*)(exi_base + EXI_CR) & EXI_CR_TSTART) == 0)
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break;
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/* XXX barrier */
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}
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/* 5.9.1.4: Fetch the data */
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data = *(vu32*)(exi_base + EXI_DATA);
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/* 5.9.1.3: Deselecting EXI devices */
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*(vu32*)(exi_base + EXI_CSR) = 0;
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return data;
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}
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static void usbgecko_putch(char ch)
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{
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if (usb_gecko_channel < 0)
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return;
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int timeout = 16;
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while (1) {
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if (usbgecko_transaction(usb_gecko_channel, USBGECKO_CMD_TX_STATUS) & USBGECKO_TX_FIFO_READY)
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break;
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timeout--;
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if (timeout < 0) {
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break;
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}
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}
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usbgecko_transaction(usb_gecko_channel, USBGECKO_CMD_TRANSMIT(ch));
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/* XXX hack to get newlines right */
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if (ch == '\n')
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usbgecko_putch('\r');
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}
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void gprintf(const char* string)
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{
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char* temp = (char*)string;
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while (*temp != '\x0')
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{
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usbgecko_putch(*temp);
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temp++;
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}
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}
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void usbgecko_init()
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{
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int i;
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for (i = 0; i < 2; i++) {
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u32 d = usbgecko_transaction(i, USBGECKO_CMD_IDENTIFY);
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if (d != USBGECKO_IDENTIFY_RESPONSE)
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continue;
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usb_gecko_channel = i;
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}
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}
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/* vim:set ts=2 sw=2: */
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