301 lines
7.6 KiB
C
301 lines
7.6 KiB
C
/*
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* File : drv_spi.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2017-11-02 勤为本 first version
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* 2018-06-09 zhuangwei add spi0 cs0 support,remove msd_init
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*/
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#include <rtthread.h>
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#include <drivers/spi.h>
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#include "drv_spi.h"
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#include "../libraries/ls1c_pin.h"
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#ifdef RT_USING_SPI
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//#define DEBUG
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#ifdef DEBUG
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#define DEBUG_PRINTF(...) rt_kprintf(__VA_ARGS__)
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#else
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#define DEBUG_PRINTF(...)
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#endif
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static rt_err_t configure(struct rt_spi_device *device, struct rt_spi_configuration *configuration);
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static rt_uint32_t xfer(struct rt_spi_device *device, struct rt_spi_message *message);
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static struct rt_spi_ops ls1c_spi_ops =
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{
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.configure = configure,
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.xfer = xfer
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};
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static rt_err_t configure(struct rt_spi_device *device,
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struct rt_spi_configuration *configuration)
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{
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struct rt_spi_bus *spi_bus = NULL;
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struct ls1c_spi *ls1c_spi = NULL;
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unsigned char SPIx = 0;
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void *spi_base = NULL;
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unsigned char cpol = 0;
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unsigned char cpha = 0;
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unsigned char val = 0;
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RT_ASSERT(NULL != device);
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RT_ASSERT(NULL != configuration);
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spi_bus = device->bus;
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ls1c_spi = (struct ls1c_spi *)spi_bus->parent.user_data;
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SPIx = ls1c_spi->SPIx;
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spi_base = ls1c_spi_get_base(SPIx);
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{
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// 使能SPI控制器，master模式，关闭中断
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reg_write_8(0x53, spi_base + LS1C_SPI_SPCR_OFFSET);
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// 清空状态寄存器
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reg_write_8(0xc0, spi_base + LS1C_SPI_SPSR_OFFSET);
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// 1字节产生中断，采样(读)与发送(写)时机同时
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reg_write_8(0x03, spi_base + LS1C_SPI_SPER_OFFSET);
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// 关闭SPI flash
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val = reg_read_8(spi_base + LS1C_SPI_SFC_PARAM_OFFSET);
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val &= 0xfe;
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reg_write_8(val, spi_base + LS1C_SPI_SFC_PARAM_OFFSET);
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// spi flash时序控制寄存器
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reg_write_8(0x05, spi_base + LS1C_SPI_SFC_TIMING_OFFSET);
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}
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// baudrate
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ls1c_spi_set_clock(spi_base, configuration->max_hz);
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// 设置通信模式(时钟极性和相位)
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if (configuration->mode & RT_SPI_CPOL) // cpol
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{
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cpol = SPI_CPOL_1;
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}
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else
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{
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cpol = SPI_CPOL_0;
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}
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if (configuration->mode & RT_SPI_CPHA) // cpha
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{
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cpha = SPI_CPHA_1;
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}
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else
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{
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cpha = SPI_CPHA_0;
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}
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ls1c_spi_set_mode(spi_base, cpol, cpha);
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DEBUG_PRINTF("ls1c spi%d configuration\n", SPIx);
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return RT_EOK;
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}
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static rt_uint32_t xfer(struct rt_spi_device *device,
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struct rt_spi_message *message)
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{
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struct rt_spi_bus *spi_bus = NULL;
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struct ls1c_spi *ls1c_spi = NULL;
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void *spi_base = NULL;
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unsigned char SPIx = 0;
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struct ls1c_spi_cs *ls1c_spi_cs = NULL;
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unsigned char cs = 0;
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rt_uint32_t size = 0;
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const rt_uint8_t *send_ptr = NULL;
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rt_uint8_t *recv_ptr = NULL;
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rt_uint8_t data = 0;
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RT_ASSERT(NULL != device);
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RT_ASSERT(NULL != message);
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spi_bus = device->bus;
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ls1c_spi = spi_bus->parent.user_data;
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SPIx = ls1c_spi->SPIx;
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spi_base = ls1c_spi_get_base(SPIx);
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ls1c_spi_cs = device->parent.user_data;
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cs = ls1c_spi_cs->cs;
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size = message->length;
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DEBUG_PRINTF("[%s] SPIx=%d, cs=%d\n", __FUNCTION__, SPIx, cs);
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// take cs
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if (message->cs_take)
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{
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ls1c_spi_set_cs(spi_base, cs, 0);
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}
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// 收发数据
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send_ptr = message->send_buf;
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recv_ptr = message->recv_buf;
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while (size--)
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{
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data = 0xFF;
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if (NULL != send_ptr)
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{
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data = *send_ptr++;
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}
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if (NULL != recv_ptr)
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{
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*recv_ptr++ = ls1c_spi_txrx_byte(spi_base, data);
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}
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else
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{
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ls1c_spi_txrx_byte(spi_base, data);
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}
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}
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// release cs
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if (message->cs_release)
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{
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ls1c_spi_set_cs(spi_base, cs, 1);
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}
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return message->length;
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}
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#ifdef RT_USING_SPI0
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struct ls1c_spi ls1c_spi0 =
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{
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.SPIx = LS1C_SPI_0,
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};
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static struct rt_spi_bus spi0_bus;
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#endif
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#ifdef RT_USING_SPI1
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struct ls1c_spi ls1c_spi1 =
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{
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.SPIx = LS1C_SPI_1,
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};
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static struct rt_spi_bus spi1_bus;
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#endif
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/*
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* 初始化并注册龙芯1c的spi总线
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* @SPI SPI总线，比如LS1C_SPI_0， LS1C_SPI_1
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* @spi_bus_name 总线名字
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* @ret
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*/
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rt_err_t ls1c_spi_bus_register(rt_uint8_t SPI, const char *spi_bus_name)
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{
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struct rt_spi_bus *spi_bus = NULL;
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#ifdef RT_USING_SPI0
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if (LS1C_SPI_0 == SPI)
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{
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spi_bus = &spi0_bus;
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spi_bus->parent.user_data = &ls1c_spi0;
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}
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#endif
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#ifdef RT_USING_SPI1
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if (LS1C_SPI_1 == SPI)
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{
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spi_bus = &spi1_bus;
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spi_bus->parent.user_data = &ls1c_spi1;
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}
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#endif
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return rt_spi_bus_register(spi_bus, spi_bus_name, &ls1c_spi_ops);
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}
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int ls1c_hw_spi_init(void)
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{
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#ifdef RT_USING_SPI0
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pin_set_purpose(78, PIN_PURPOSE_OTHER);
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pin_set_purpose(79, PIN_PURPOSE_OTHER);
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pin_set_purpose(80, PIN_PURPOSE_OTHER);
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pin_set_purpose(83, PIN_PURPOSE_OTHER);//cs2 - SD card
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pin_set_purpose(82, PIN_PURPOSE_OTHER);//cs1
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pin_set_purpose(81, PIN_PURPOSE_OTHER);//cs0
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pin_set_remap(78, PIN_REMAP_DEFAULT);
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pin_set_remap(79, PIN_REMAP_DEFAULT);
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pin_set_remap(80, PIN_REMAP_DEFAULT);
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pin_set_remap(83, PIN_REMAP_DEFAULT);//cs2 - SD card
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pin_set_remap(82, PIN_REMAP_DEFAULT);//CS1
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pin_set_remap(81, PIN_REMAP_DEFAULT);//cs0
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ls1c_spi_bus_register(LS1C_SPI_0, "spi0");
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#endif
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#ifdef RT_USING_SPI1
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pin_set_purpose(46, PIN_PURPOSE_OTHER);
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pin_set_purpose(47, PIN_PURPOSE_OTHER);
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pin_set_purpose(48, PIN_PURPOSE_OTHER);
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pin_set_purpose(49, PIN_PURPOSE_OTHER);//CS0 - touch screen
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pin_set_remap(46, PIN_REMAP_THIRD);
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pin_set_remap(47, PIN_REMAP_THIRD);
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pin_set_remap(48, PIN_REMAP_THIRD);
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pin_set_remap(49, PIN_REMAP_THIRD);//CS0 - touch screen
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ls1c_spi_bus_register(LS1C_SPI_1, "spi1");
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#endif
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#ifdef RT_USING_SPI0
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/* attach cs */
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{
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static struct rt_spi_device spi_device0;
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static struct rt_spi_device spi_device1;
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static struct rt_spi_device spi_device2;
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static struct ls1c_spi_cs spi_cs0;
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static struct ls1c_spi_cs spi_cs1;
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static struct ls1c_spi_cs spi_cs2;
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/* spi02: CS2 SD Card*/
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spi_cs2.cs = LS1C_SPI_CS_2;
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rt_spi_bus_attach_device(&spi_device2, "spi02", "spi0", (void *)&spi_cs2);
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spi_cs1.cs = LS1C_SPI_CS_1;
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rt_spi_bus_attach_device(&spi_device1, "spi01", "spi0", (void *)&spi_cs1);
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spi_cs0.cs = LS1C_SPI_CS_0;
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rt_spi_bus_attach_device(&spi_device0, "spi00", "spi0", (void *)&spi_cs0);
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}
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#endif
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#ifdef RT_USING_SPI1
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{
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static struct rt_spi_device spi_device;
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static struct ls1c_spi_cs spi_cs;
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/* spi10: CS0 Touch*/
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spi_cs.cs = LS1C_SPI_CS_0;
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rt_spi_bus_attach_device(&spi_device, "spi10", "spi1", (void *)&spi_cs);
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}
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#endif
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}
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INIT_BOARD_EXPORT(ls1c_hw_spi_init);
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#endif
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