linux学习之路_添加自己的slave IP core到ORSoC并测试

mutougeda · 发表于 2021-9-8 13:45

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引言

之前的一篇文章与今天的类似：linux学习之路_编写ipcore 的linux driver，然后run helloworld

那篇算是一个比较详细的概述吧，那篇文章把精力主要集中在driver部分，提到ip core的编码时，一笔带过。
这次进一步细化，写一个真的可以work的ip core，加到现有的ORSoC上，结合那篇文章的driver部分，一个真的可以work的东西就诞生了。

本小节实现了一个简单的ipcore：mycore。她的功能也非常简单，实现一个加法运算。
master（CPU）设置mycore的第一个寄存器，和第二个寄存器，mycore将两个寄存器的值相加放在第三个寄存器中，CPU读第三个寄存器来获得计算结果。
这次试验可以看到mycore计算1+2=3。
ok let's go!

1 ip core的编码和修改
要想在ORSoC里面加入自己的ipcore(本小节以‘mycore’为例)，需要修改三个文件，增加一个文件。
三个需要修改的文件为：arbiter_dbus.v,orpsoc-params.v,orpsoc_top.v
一个需要增加的文件为：mycore.v
如下图：这里需要注意的是，在ORSoC里面共有3个wishbone的arbiter，咱们用的是arbiter_dbus。为什么呢？很简单，instruction那个是取指令用的，很显然不能用；byte那个是8位的，我的是32位的，很显然也不能用。

2 概述
一般，添加自己的ipcore到ORSoC，需要三大步：
1>编写符合wishbone inteRFace的ipcore：mycore
2>定义mycore中用到的parameters
3>增加arbiter的slave或者mater接口（本小节是slave）
4>在顶层module例化这个ipcore

当然为了测试验证，还要
5>编写她的driver。

3 rtl编码
下面就逐个把需要修改的文件的内容说一下：
1》编写符合wishbone interface的ipcore：mycore.v

/*
*
* rill create 2013-03-26
*
*/
`include "orpsoc-defines.v"
module mycore
(
wb_clk,
wb_rst,
wb_dat_i,
wb_adr_i,
wb_sel_i,
wb_cti_i,
wb_bte_i,
wb_we_i,
wb_cyc_i,
wb_stb_i,
wb_dat_o,
wb_ack_o,
wb_err_o,
wb_rty_o
);
input [addr_width-1:0] wb_adr_i;
input wb_stb_i;
input wb_cyc_i;
input [2:0] wb_cti_i;
input [1:0] wb_bte_i;
input wb_clk;
input wb_rst;
input [31:0] wb_dat_i;
input [3:0] wb_sel_i;
input wb_we_i;
output reg [31:0] wb_dat_o;
output reg wb_ack_o;
output wb_err_o;
output wb_rty_o;
//external parameters
parameter addr_width = 32;
parameter mycore_adr = 0;
//local regs
reg [addr_width-1:0] num_1;
reg [addr_width-1:0] num_2;
reg [addr_width-1:0] sum;
parameter s_idle = 2'b000;
parameter s_read = 2'b001;
parameter s_write = 2'b010;
reg [2:0] state = s_idle;
assign wb_err_o=0;
assign wb_rty_o=0;
always @(*)
begin
sum = num_1 + num_2;
end
always @(posedge wb_clk)
begin
if(wb_rst)
begin
state <= s_idle;
end
else
begin
case(state)
s_idle:
begin
wb_dat_o <= 1'b0;
wb_ack_o <= 1'b0;
if(wb_stb_i && wb_cyc_i && wb_we_i)
begin
state <= s_write;
end
else if(wb_stb_i && wb_cyc_i && !wb_we_i)
begin
state <= s_read;
end
else
begin
state <= s_idle;
end
end
s_write:
begin
if(wb_adr_i == {mycore_adr,24'h000000})
begin
num_1 <= wb_dat_i;
wb_ack_o <= 1'b1;
end
else if(wb_adr_i == {mycore_adr,24'h000004})
begin
num_2 <= wb_dat_i;
wb_ack_o <= 1'b1;
end
else
begin
//wb_ack_o=1'b0;
end
state <= s_idle;
end
s_read:
begin
if(wb_adr_i=={mycore_adr,24'h000000})
begin
wb_dat_o <= num_1;
wb_ack_o <= 1'b1;
end
else if(wb_adr_i=={mycore_adr,24'h000004})
begin
wb_dat_o <= num_2;
wb_ack_o <= 1'b1;
end
else if(wb_adr_i=={mycore_adr,24'h000008})
begin
wb_dat_o <= sum;
wb_ack_o <= 1'b1;
end
else
begin
wb_dat_o=0;
wb_ack_o <= 1'b1;
end
state <= s_idle;
end
default:
begin
state <= s_idle;
end
endcase
end
end
endmodule
/************** EOF ****************/
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2》定义mycore中用到的parameters：修改orpsoc-params.v，共3个地方需要修改，如图：

1>修改1

2>修改2-3

3》增加arbiter的slave或者mater接口（本小节是slave）：修改arbiter_dbus.v，共13个地方需要修改，如图：

1>修改1

1>修改2

1>修改3

1>修改4

1>修改5

1>修改6-7

1>修改8

1>修改9

1>修改10

1>修改11

1>修改12

1>修改13

4》在顶层module例化这个ipcore：修改orpsoc_top.v，共4个地方需要修改，如图：

1>修改1

1>修改2

1>修改3

1>修改4

自此，可以通过quartusII进行综合，生成orpsoc_top.svf文件，将其burn到FPGA板子里面。

4 driver

有了硬件电路，想让她工作，还要编写她的driver才行：ip_mkg.c ip_mkg.h Makefile

1》ip_mkg.c

/*
*
* rill mkg driver
*
*/
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <asm/uaccess.h> /* get_user and put_user */
//#include <linux/clk.h>
//#include <linux/ioport.h>
#include <asm/io.h> /*ioremap*/
#include <linux/platform_device.h> /*cleanup_module*/
#include "ip_mkg.h"
void __iomem *g_mkg_mem_base = NULL;
static int device_open(struct inode *inode, struct file *file)
{
g_mkg_mem_base = ioremap(MKG_MEM_BASE,MKG_MEM_LEN);
if(NULL == g_mkg_mem_base)
{
printk(KERN_ERR "mkg open ioremap error!\n");
return -1;
}
else
{
printk("mkg ioremap addr:%d!\n",(int)g_mkg_mem_base);
}
return 0;
}
static int device_release(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t device_read(struct file *filp, char *buffer, size_t length, loff_t *offset)
{
/*int ret_val = 0;
char * data = NULL;
data = (char*)kmalloc(4, GFP_KERNEL);
if((ret_val = copy_from_user(new_regs, (struct reg_data*)ioctl_param, sizeof(struct reg_data))) != 0)
ioread32(g_mkg_mem_base+length);
printk("============read:%d\n",);*/
return 1;
}
static ssize_t device_write(struct file *filp, const char *buffer, size_t count, loff_t *offset)
{
//iowrite32(2,g_mkg_mem_base);
return 1;
}
long device_ioctl(struct file *file, unsigned int ioctl_num, unsigned long ioctl_param)
{
#if 0
int ret_val = 0;
unsigned int ret = 0;
struct reg_data *new_regs;
printk("ioctl======\n");
switch(ioctl_num)
{
case IOCTL_REG_SET:
{
new_regs = (struct reg_data*)kmalloc(sizeof(struct reg_data), GFP_KERNEL);
if((ret_val = copy_from_user(new_regs, (struct reg_data*)ioctl_param, sizeof(struct reg_data))) != 0)
{
kfree(new_regs);
printk(KERN_ERR " error copy line_datafrom user.\n");
return -1;
}
//iowrite16(new_regs->value,g_mkg_mem_base+new_regs->addr);
kfree(new_regs);
}
break;
case IOCTL_REG_GET:
{
new_regs = (struct reg_data*)kmalloc(sizeof(struct reg_data), GFP_KERNEL);
if((ret_val = copy_from_user(new_regs, (struct reg_data*)ioctl_param, sizeof(struct reg_data))) != 0)
{
kfree(new_regs);
printk(KERN_ERR " error copy line_datafrom user.\n");
return -1;
}
//ret = ioread16(g_mkg_mem_base+new_regs->addr);
kfree(new_regs);
return ret;
}
break;
}
#endif
return -1;
}
struct file_operations our_file_ops = {
.unlocked_ioctl = device_ioctl,
.read = device_read,
.write = device_write,
.open = device_open,
.release = device_release,
.owner = THIS_MODULE,
};
int init_module()
{
int ret_val;
int ret;
void __iomem *ret_from_request;
int loop = 5;
//=== Allocate character device
ret_val = register_chrdev(MAJOR_NUM, DEVICE_NAME, &our_file_ops);
if (ret_val < 0)
{
printk(KERN_ALERT " device %s failed(%d)\n", DEVICE_NAME, ret_val);
return ret_val;
}
ret = check_mem_region(MKG_MEM_BASE, MKG_MEM_LEN);
if (ret < 0)
{
printk(KERN_ERR "mkg check_mem_region bussy error!\n");
return -1;
}
ret_from_request = request_mem_region(MKG_MEM_BASE, MKG_MEM_LEN, "ip_mkg");
//===ioremap mkg registers
g_mkg_mem_base = ioremap(MKG_MEM_BASE,MKG_MEM_LEN);
if(NULL == g_mkg_mem_base)
{
printk(KERN_ERR "mkg ioremap error!\n");
return -1;
}
else
{
;//printk("mkg ioremap addr:%d!\n",g_mkg_mem_base);
}
printk("mkg module init done!\n");
iowrite32(0x1,g_mkg_mem_base);
printk("mkg write1!\n");
iowrite32(0x2,g_mkg_mem_base+4);
printk("mkg write2!\n");
while(loop--)
printk("======%d======read:%d\n",loop,ioread32(g_mkg_mem_base+4*loop));
return 0;
}
void cleanup_module()
{
release_mem_region(MKG_MEM_BASE, MKG_MEM_LEN);
unregister_chrdev(MAJOR_NUM, DEVICE_NAME);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Rill zhen:rill_zhen@126.com");
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2》ip_mkg.h

#ifndef __IP_MKG_H__
#define __IP_MKG_H__
#define MAJOR_NUM 102
#define DEVICE_NAME "ip_mkg"
#define MKG_MEM_BASE 0x97000000
#define MKG_MEM_LEN 32
#define IOCTL_REG_SET 0
#define IOCTL_REG_GET 1
struct reg_data
{
unsigned short addr;
int value;
};
#endif
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3》Makefile

# To build modules outside of the kernel tree, we run "make"
# in the kernel source tree; the Makefile these then includes this
# Makefile once again.
# This conditional selects whether we are being included from the
# kernel Makefile or not.
ifeq ($(KERNELRELEASE),)
# Assume the source tree is where the running kernel was built
# You should set KERNELDIR in the environment if it's elsewhere
KERNELDIR ?= /home/openrisc/soc-design/linux
# The current directory is passed to sub-makes as argument
PWD := $(shell pwd)
modules:
make -C $(KERNELDIR) M=$(PWD) modules ARCH=openrisc CROSS_COMPILE=or32-linux-
modules_install:
make -C $(KERNELDIR) M=$(PWD) modules_install ARCH=openrisc CROSS_COMPILE=or32-linux-
clean:
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions *.order *.symvers
.PHONY: modules modules_install clean
else
# called from kernel build system: just declare what our modules are
obj-m := ip_mkg.o
endif& d8 Q# H7 K+ n* z& e7 q+ T0 e: j