本次在Linux-4.14上面移植DM9000，刚开始设备起不来，调试了很长时间，最终发现是因为没有使能S5Pv210的SROMC时钟。
参考DTS文件中DM9000配置
target/linux/samsung/dts/TQ210.dts
/ {
model = "Embedsky TQ210 based on S5PV210";
compatible = "embedsky,tq210", "samsung,s5pv210";
chosen {
bootargs = "console=ttySAC0,115200n8";
};
memory@20000000 {
device_type = "memory";
reg = <0x20000000 0x40000000>;
};
ethernet@88000000 {
compatible = "davicom,dm9000";
reg = <0x88000000 0x2 0x88000004 0x2>;
interrupt-parent = <&gph1>;
interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
local-mac-address = [00 00 de ad be ef];
davicom,no-eeprom;
clocks = <&clocks CLK_SROMC>;
clock-names = "sromc";
};
};
使用外部中断10，对应GPH1的2号引脚。
配置时钟为sromc。
参考补丁：
target/linux/samsung/patches-4.14/002-dm9000-clk.patch
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -39,6 +39,7 @@
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
+#include <linux/clk.h>
#include <asm/delay.h>
#include <asm/irq.h>
@@ -1436,6 +1437,7 @@ dm9000_probe(struct platform_device *pde
enum of_gpio_flags flags;
struct regulator *power;
bool inv_mac_addr = false;
+ const char *clk_name;
power = devm_regulator_get(dev, "vcc");
if (IS_ERR(power)) {
@@ -1573,6 +1575,18 @@ dm9000_probe(struct platform_device *pde
goto out;
}
+ /* Enable clock if specified */
+ if (!of_property_read_string(dev->of_node, "clock-names", &clk_name)) {
+ struct clk *clk = devm_clk_get(dev, clk_name);
+ if (IS_ERR(clk)) {
+ dev_err(dev, "cannot get clock of %s\n", clk_name);
+ ret = PTR_ERR(clk);
+ goto out;
+ }
+ clk_prepare_enable(clk);
+ dev_info(dev, "enable clock '%s'\n", clk_name);
+ }
+
/* fill in parameters for net-dev structure */
ndev->base_addr = (unsigned long)db->io_addr;
配置内核，选中DM9000
make kernel_menuconfig
Device Drivers --->
[*] Network device support --->
[*] Ethernet driver support --->
<*> DM9000 support
重新编译固件
make -j4
运行
[ 1.817735] 0x000000040000-0x000000340000 : "kernel"
[ 1.820905] 0x000000340000-0x000040000000 : "rootfs"
[ 1.836650] mtd: device 2 (rootfs) set to be root filesystem
[ 1.836849] mtdsplit: no squashfs found in "rootfs"
[ 1.839211] dm9000 88000000.ethernet: enable clock 'sromc'
[ 1.841356] eth0: dm9000b at c085b000,c085d004 IRQ 144 MAC: 00:00:de:ad:be:ef (platform data)
[ 1.857832] NET: Registered protocol family 10
[ 1.864500] Segment Routing with IPv6
root@OpenWrt:/# ifconfig
br-lan Link encap:Ethernet HWaddr 00:00:DE:AD:BE:EF
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fda2:7349:db32::1/60 Scope:Global
inet6 addr: fe80::200:deff:fead:beef/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2571 errors:0 dropped:0 overruns:0 frame:0
TX packets:35 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:151319 (147.7 KiB) TX bytes:4011 (3.9 KiB)
eth0 Link encap:Ethernet HWaddr 00:00:DE:AD:BE:EF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2571 errors:0 dropped:0 overruns:0 frame:0
TX packets:40 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:197597 (192.9 KiB) TX bytes:4437 (4.3 KiB)
Interrupt:144 Base address:0xb000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:188 errors:0 dropped:0 overruns:0 frame:0
TX packets:188 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12840 (12.5 KiB) TX bytes:12840 (12.5 KiB)