144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/*
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* Copyright (c) 2018 naehrwert
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "i2c.h"
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#include "../utils/util.h"
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static u32 i2c_addrs[] = {
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0x7000C000, 0x7000C400, 0x7000C500,
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0x7000C700, 0x7000D000, 0x7000D100
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};
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static void _i2c_wait(vu32 *base)
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{
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base[I2C_CONFIG_LOAD] = 0x25;
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for (u32 i = 0; i < 20; i++)
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{
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usleep(1);
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if (!(base[I2C_CONFIG_LOAD] & 1))
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break;
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}
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}
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static int _i2c_send_pkt(u32 idx, u32 x, u8 *buf, u32 size)
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{
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if (size > 4)
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return 0;
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u32 tmp = 0;
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memcpy(&tmp, buf, size);
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vu32 *base = (vu32 *)i2c_addrs[idx];
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base[I2C_CMD_ADDR0] = x << 1; //Set x (send mode).
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base[I2C_CMD_DATA1] = tmp; //Set value.
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base[I2C_CNFG] = (2 * size - 2) | 0x2800; //Set size and send mode.
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_i2c_wait(base); //Kick transaction.
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base[I2C_CNFG] = (base[I2C_CNFG] & 0xFFFFFDFF) | 0x200;
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while (base[I2C_STATUS] & 0x100)
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;
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if (base[I2C_STATUS] << 28)
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return 0;
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return 1;
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}
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static int _i2c_recv_pkt(u32 idx, u8 *buf, u32 size, u32 x)
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{
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if (size > 8)
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return 0;
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vu32 *base = (vu32 *)i2c_addrs[idx];
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base[I2C_CMD_ADDR0] = (x << 1) | 1; // Set x (recv mode).
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base[I2C_CNFG] = (size - 1) << 1 | 0x2840; // Set size and recv mode.
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_i2c_wait(base); // Kick transaction.
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base[I2C_CNFG] = (base[I2C_CNFG] & 0xFFFFFDFF) | 0x200;
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while (base[I2C_STATUS] & 0x100)
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;
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if (base[I2C_STATUS] << 28)
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return 0;
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u32 tmp = base[I2C_CMD_DATA1]; // Get LS value.
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if (size > 4)
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{
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memcpy(buf, &tmp, 4);
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tmp = base[I2C_CMD_DATA2]; // Get MS value.
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memcpy(buf + 4, &tmp, size - 4);
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}
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else
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memcpy(buf, &tmp, size);
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return 1;
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}
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void i2c_init(u32 idx)
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{
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vu32 *base = (vu32 *)i2c_addrs[idx];
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base[I2C_CLK_DIVISOR_REGISTER] = 0x50001;
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base[I2C_BUS_CLEAR_CONFIG] = 0x90003;
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_i2c_wait(base);
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for (u32 i = 0; i < 10; i++)
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{
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usleep(20000);
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if (base[INTERRUPT_STATUS_REGISTER] & 0x800)
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break;
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}
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(vu32)base[I2C_BUS_CLEAR_STATUS];
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base[INTERRUPT_STATUS_REGISTER] = base[INTERRUPT_STATUS_REGISTER];
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}
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int i2c_send_buf_small(u32 idx, u32 x, u32 y, u8 *buf, u32 size)
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{
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u8 tmp[4];
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if (size > 3)
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return 0;
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tmp[0] = y;
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memcpy(tmp + 1, buf, size);
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return _i2c_send_pkt(idx, x, tmp, size + 1);
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}
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int i2c_recv_buf_small(u8 *buf, u32 size, u32 idx, u32 x, u32 y)
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{
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int res = _i2c_send_pkt(idx, x, (u8 *)&y, 1);
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if (res)
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res = _i2c_recv_pkt(idx, buf, size, x);
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return res;
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}
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int i2c_send_byte(u32 idx, u32 x, u32 y, u8 b)
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{
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return i2c_send_buf_small(idx, x, y, &b, 1);
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}
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u8 i2c_recv_byte(u32 idx, u32 x, u32 y)
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{
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u8 tmp = 0;
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i2c_recv_buf_small(&tmp, 1, idx, x, y);
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return tmp;
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}
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