Device Tree（五）移植DM9000，并挂载NFS

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/JerryGou/article/details/85109884

1、添加\修改DTS文件中DM9000配置

/ {
	model = "Samsung Louis210 based on S5PV210";
	compatible = "samsung,Louis210", "samsung,s5pv210";

	chosen {
		bootargs = "console=ttySAC0,115200n8 root=/dev/nfs nfsroot=192.168.5.136:/root/code/rootfs ip=192.168.5.187 init=/init";
	};

	memory@20000000 {
		device_type = "memory";
		reg = <0x20000000 0x40000000>;
	};

	ethernet@88000000 {
		compatible = "davicom,dm9000";
		reg = <0x88000000 0x2 0x88000004 0x2>;
		interrupt-parent = <&gph1>;
		interrupts = <2 4>;
		local-mac-address = [00 00 de ad be ef];
		davicom,no-eeprom;
		clocks = <&clocks CLK_SROMC>;
		clock-names = "sromc";
	};

	backlight {
		compatible = "pwm-backlight";
		pwms = <&pwm 3 5000000 0>;
		brightness-levels = <0 4 8 16 32 64 128 255>;
		default-brightness-level = <6>;
		pinctrl-names = "default";
		pinctrl-0 = <&pwm3_out>;
	};
};

&xusbxti {
	clock-frequency = <24000000>;
};

/* add by Louis */
&xxti {
	clock-frequency = <24000000>;
};

本次在Linux-4.19.10上面移植DM9000，刚开始DM9000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。

使用外部中断10，对应GPH1的2号引脚。
配置时钟为sromc。

2、修改drivers\net\ethernet\davicom\dm9000.c文件，添加SROMC时钟使能

--- 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;

3、其他步骤参考 kernel（二）网卡（DM9000）及nfs文件系统

打印信息：

Starting kernel ... Booting Linux on physical CPU 0x0 Linux version 4.19.10 (root@ubuntu) (gcc version 7.3.0 (Ubuntu/Linaro 7.3.0-27ubuntu1~18.04)) #2 PREEMPT Wed Dec 19 04:49:03 PST 2018 CPU: ARMv7 Processor [412fc082] revision 2 (ARMv7), cr=10c5387d CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache OF: fdt: Machine model: Samsung Louis210 based on S5PV210 Memory policy: Data cache writeback CPU: All CPU(s) started in SVC mode. random: get_random_bytes called from start_kernel+0x9c/0x3f8 with crng_init=0 Built 1 zonelists, mobility grouping on.  Total pages: 260096 Kernel command line: root=/dev/nfs nfsroot=192.168.5.136:/root/code/rootfs ip=192.168.5.187 init=/init console=ttySAC0,115200 rw Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 1030784K/1048576K available (5120K kernel code, 209K rwdata, 1504K rodata, 1024K init, 248K bss, 17792K reserved, 0K cma-reserved) Virtual kernel memory layout:     vector  : 0xffff0000 - 0xffff1000   (   4 kB)     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)     vmalloc : 0xc0800000 - 0xff800000   (1008 MB)     lowmem  : 0x80000000 - 0xc0000000   (1024 MB)     modules : 0x7f000000 - 0x80000000   (  16 MB)       .text : 0x(ptrval) - 0x(ptrval)   (6112 kB)       .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)       .data : 0x(ptrval) - 0x(ptrval)   ( 210 kB)        .bss : 0x(ptrval) - 0x(ptrval)   ( 249 kB) SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 rcu: Preemptible hierarchical RCU implementation.         Tasks RCU enabled. NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 VIC @(ptrval): id 0x00041192, vendor 0x41 VIC @(ptrval): id 0x00041192, vendor 0x41 VIC @(ptrval): id 0x00041192, vendor 0x41 VIC @(ptrval): id 0x00041192, vendor 0x41 S5PV210 clocks: mout_apll = 1000000000, mout_mpll = 667000000         mout_epll = 96000000, mout_vpll = 54000000 sched_clock: 32 bits at 33MHz, resolution 29ns, wraps every 64392313329ns clocksource: samsung_clocksource_timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 57309158834 ns Console: colour dummy device 80x30 Calibrating delay loop... 996.14 BogoMIPS (lpj=4980736) pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 2048 (order: 1, 8192 bytes) Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes) CPU: Testing write buffer coherency: ok CPU0: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable Setting up static identity map for 0x20100000 - 0x20100060 rcu: Hierarchical SRCU implementation. devtmpfs: initialized VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 2 clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns futex hash table entries: 256 (order: 0, 7168 bytes) pinctrl core: initialized pinctrl subsystem NET: Registered protocol family 16 DMA: preallocated 256 KiB pool for atomic coherent allocations SCSI subsystem initialized usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb clocksource: Switched to clocksource samsung_clocksource_timer NET: Registered protocol family 2 tcp_listen_portaddr_hash hash table entries: 512 (order: 1, 12288 bytes) TCP established hash table entries: 8192 (order: 3, 32768 bytes) TCP bind hash table entries: 8192 (order: 5, 163840 bytes) TCP: Hash tables configured (established 8192 bind 8192) UDP hash table entries: 512 (order: 2, 24576 bytes) UDP-Lite hash table entries: 512 (order: 2, 24576 bytes) NET: Registered protocol family 1 RPC: Registered named UNIX socket transport module. RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp NFSv4.1 backchannel transport module. Initialise system trusted keyrings workingset: timestamp_bits=30 max_order=18 bucket_order=0 romfs: ROMFS MTD (C) 2007 Red Hat, Inc. Key type asymmetric registered Asymmetric key parser 'x509' registered io scheduler noop registered io scheduler deadline registered io scheduler cfq registered (default) io scheduler mq-deadline registered io scheduler kyber registered Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled e2900000.serial: ttySAC0 at MMIO 0xe2900000 (irq = 58, base_baud = 0) is a S3C6400/10 console [ttySAC0] enabled e2900400.serial: ttySAC1 at MMIO 0xe2900400 (irq = 59, base_baud = 0) is a S3C6400/10 e2900800.serial: ttySAC2 at MMIO 0xe2900800 (irq = 60, base_baud = 0) is a S3C6400/10 e2900c00.serial: ttySAC3 at MMIO 0xe2900c00 (irq = 61, base_baud = 0) is a S3C6400/10 exynos4-fb f8000000.fimd: failed to get system register. OF: graph: no port node found in /soc/fimd@f8000000 [drm] Exynos DRM: using f8000000.fimd device for DMA mapping operations exynos-drm exynos-drm: bound f8000000.fimd (ops fimd_component_ops) [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [drm] No driver support for vblank timestamp query. Console: switching to colour frame buffer device 100x30 exynos-drm exynos-drm: fb0:  frame buffer device [drm] Initialized exynos 1.1.0 20180330 for exynos-drm on minor 0 brd: module loaded loop: module loaded dm9000 88000000.ethernet: 88000000.ethernet supply vcc not found, using dummy regulator dm9000 88000000.ethernet: Linked as a consumer to regulator.0 dm9000 88000000.ethernet: enable clock 'sromc' eth0: dm9000b at (ptrval),(ptrval) IRQ 144 MAC: 00:00:de:ad:be:ef (platform data) ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver ehci-exynos: EHCI EXYNOS driver ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver ohci-exynos: OHCI EXYNOS driver sdhci: Secure Digital Host Controller Interface driver sdhci: Copyright(c) Pierre Ossman s3c-sdhci eb000000.sdhci: clock source 0: mmc_busclk.0 (133400000 Hz) s3c-sdhci eb000000.sdhci: clock source 2: mmc_busclk.2 (96000000 Hz) mmc0: SDHCI controller on samsung-hsmmc [eb000000.sdhci] using ADMA s3c-sdhci eb100000.sdhci: clock source 0: mmc_busclk.0 (133400000 Hz) s3c-sdhci eb100000.sdhci: clock source 2: mmc_busclk.2 (96000000 Hz) mmc1: SDHCI controller on samsung-hsmmc [eb100000.sdhci] using ADMA s3c-sdhci eb200000.sdhci: clock source 0: mmc_busclk.0 (133400000 Hz) s3c-sdhci eb200000.sdhci: clock source 2: mmc_busclk.2 (96000000 Hz) mmc2: SDHCI controller on samsung-hsmmc [eb200000.sdhci] using ADMA s3c-sdhci eb300000.sdhci: clock source 0: mmc_busclk.0 (133400000 Hz) s3c-sdhci eb300000.sdhci: clock source 3: mmc_busclk.3 (96000000 Hz) mmc3: Internal clock never stabilised. mmc3: sdhci: ============ SDHCI REGISTER DUMP =========== mmc3: sdhci: Sys addr:  0x00000000 | Version:  0x00002401 mmc3: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000 mmc3: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000 mmc3: sdhci: Present:   0x01fa0000 | Host ctl: 0x00000000 mmc3: sdhci: Power:     0x0000000e | Blk gap:  0x00000000 mmc3: sdhci: Wake-up:   0x00000000 | Clock:    0x00008001 mmc3: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000 mmc3: sdhci: Int enab:  0x00ff0043 | Sig enab: 0x00ff0043 mmc3: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000 mmc3: sdhci: Caps:      0x05e80080 | Caps_1:   0x00000000 mmc3: sdhci: Cmd:       0x00000000 | Max curr: 0x00000000 mmc3: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000 mmc3: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000 mmc3: sdhci: Host ctl2: 0x00000000 mmc3: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0x00000000 mmc3: sdhci: ============================================ mmc3: SDHCI controller on samsung-hsmmc [eb300000.sdhci] using ADMA usbcore: registered new interface driver usbhid usbhid: USB HID core driver NET: Registered protocol family 10 Segment Routing with IPv6 sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver NET: Registered protocol family 17 Loading compiled-in X.509 certificates hctosys: unable to open rtc device (rtc0) random: fast init done dm9000 88000000.ethernet eth0: link down dm9000 88000000.ethernet eth0: link down IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready IP-Config: Guessing netmask 255.255.255.0 IP-Config: Complete:      device=eth0, hwaddr=00:00:de:ad:be:ef, ipaddr=192.168.5.187, mask=255.255.255.0, gw=255.255.255.255      host=192.168.5.187, domain=, nis-domain=(none)      bootserver=255.255.255.255, rootserver=192.168.5.136, rootpath= dm9000 88000000.ethernet eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1 VFS: Mounted root (nfs filesystem) on device 0:12. devtmpfs: mounted Freeing unused kernel memory: 1024K Run /init as init process init started: BusyBox v1.21.1 (2014-06-28 16:54:15 CST) /dev/watchdog: No such file or directory random: sshd: uninitialized urandom read (32 bytes read) Please press Enter to activate this console. random: crng init done Processing /etc/profile... Done [root@Louis210: /]#