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\u4e8c\u3001\u8f6f\u4ef6\u90e8\u5206<\/h2>\n\n\n\n

\u8fd9\u91cc\u4f7f\u7528\u7684\u662f3.14.28\u7248\u672clinux\u5185\u6838\uff0c\u7531\u4e8e\u652f\u6301\u8bbe\u5907\u6811\uff0c\u4e3a\u9a71\u52a8\u7a0b\u5e8f\u7684\u7f16\u5199\u5e26\u6765\u4e86\u5f88\u591a\u4fbf\u5229\u3002\u9996\u5148\u4fee\u6539dts\u6587\u4ef6\uff0c\u4f7f\u80fdWEIM\u603b\u7ebf\uff0c\u5e76\u914d\u7f6e\u9700\u8981\u7528\u5230\u7684\u529f\u80fd\u5f15\u811a\u3001GPIO\u3001\u4e2d\u65ad\u5f15\u811a\u3002<\/p>\n\n\n\n

&weim {\r\n    pinctrl-names = \"default\";\r\n    pinctrl-0 = <&pinctrl_weim>;\r\n    status = \"okay\";\r\n};\r\n&iomuxc {\r\n        pinctrl_weim: weim1grp {\r\n            fsl,pins = <\r\n                MX6QDL_PAD_EIM_OE__EIM_OE_B         0x9091\r\n                MX6QDL_PAD_EIM_RW__EIM_RW           0x9091\r\n                MX6QDL_PAD_EIM_CS0__EIM_CS0_B       0x9091\r\n                MX6QDL_PAD_EIM_LBA__EIM_LBA_B       0x9091\r\n                \/* SJA1000_RST *\/\r\n                MX6QDL_PAD_EIM_EB0__GPIO2_IO28      0x9091\r\n                \/* SJA1000 INT *\/\r\n                MX6QDL_PAD_DI0_DISP_CLK__GPIO4_IO16 0x9091\r\n                MX6QDL_PAD_DI0_PIN15__GPIO4_IO17    0x9091\r\n                MX6QDL_PAD_DI0_PIN2__GPIO4_IO18     0x9091\r\n                MX6QDL_PAD_DI0_PIN3__GPIO4_IO19     0x9091\r\n                \/* SJA1000 LED *\/\r\n                MX6QDL_PAD_DISP0_DAT5__GPIO4_IO26   0x80000000\r\n                MX6QDL_PAD_DISP0_DAT6__GPIO4_IO27   0x80000000\r\n                MX6QDL_PAD_DISP0_DAT7__GPIO4_IO28   0x80000000\r\n                MX6QDL_PAD_DISP0_DAT8__GPIO4_IO29   0x80000000\r\n                \/* SJA1000_ADDA *\/\r\n                MX6QDL_PAD_EIM_DA0__EIM_AD00        0x9091\r\n                MX6QDL_PAD_EIM_DA1__EIM_AD01        0x9091\r\n                MX6QDL_PAD_EIM_DA2__EIM_AD02        0x9091\r\n                MX6QDL_PAD_EIM_DA3__EIM_AD03        0x9091\r\n                MX6QDL_PAD_EIM_DA4__EIM_AD04        0x9091\r\n                MX6QDL_PAD_EIM_DA5__EIM_AD05        0x9091\r\n                MX6QDL_PAD_EIM_DA6__EIM_AD06        0x9091\r\n                MX6QDL_PAD_EIM_DA7__EIM_AD07        0x9091\r\n                MX6QDL_PAD_EIM_DA8__EIM_AD08        0x9091\r\n                MX6QDL_PAD_EIM_DA9__EIM_AD09        0x9091\r\n                MX6QDL_PAD_EIM_DA10__EIM_AD10       0x9091\r\n                MX6QDL_PAD_EIM_DA11__EIM_AD11       0x9091\r\n                MX6QDL_PAD_EIM_DA12__EIM_AD12       0x9091\r\n                MX6QDL_PAD_EIM_DA13__EIM_AD13       0x9091\r\n                MX6QDL_PAD_EIM_DA14__EIM_AD14       0x9091\r\n                MX6QDL_PAD_EIM_DA15__EIM_AD15       0x9091\r\n            >;\r\n        };\r\n    };\r\n};<\/code><\/pre>\n\n\n\n
weim\u603b\u7ebf\u4e2d\u914d\u7f6e\u7684\u5f15\u811a\u6709 EIM_DA0_15\uff08\u53ea\u7528\u5230DA1_12\uff09\u3001EIM_OE\u3001EIM_RW\u3001EIM_LBA\u3001EIM_CS0\uff08cs\u7ebf\u7531\u9ad8\u4f4d\u5730\u5740\u7ebf\u53d6\u4ee3\uff0c\u8fd9\u91cc\u65e0\u7528\uff09\uff0csja1000\u9a71\u52a8\u4e2d\u6dfb\u52a0\u4e86\u56db\u4e2a\u4e2d\u65ad\u5f15\u811a\uff08\u5bf9\u5e944\u4e2asja1000\u82af\u7247\uff09\u30014\u4e2aLED gpio\uff08CAN\u901a\u4fe1\u6307\u793a\u706f\u7528\uff09\u3001RST GPIO\uff08\u4ea7\u751f\u786c\u590d\u4f4d\u4fe1\u53f7\uff0c\u4e00\u822c\u4e0d\u7528\uff09\u3002\u63a5\u4e0b\u6765\u770bsja1000\u9a71\u52a8\u9700\u8981\u6dfb\u52a0\u7684dts\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n\n\n\n
\/ {\r\n    sja1000@08001C00 {\r\n        compatible  = \"weim,sja1000\";\r\n        reg         = <0x08001C00 0x1FF>;\r\n        nxp,external-clock-frequency = <16000000>;\r\n        nxp,tx-output-config = <0x16>;\r\n        nxp,no-comparator-bypass;\r\n        interrupt-parent    =   <&gpio4>;\r\n        interrupts          =   <16 0>;\r\n        int-gpios           =   <&gpio4 16 0>;\r\n        rst-gpios           =   <&gpio2 28 0>;\r\n        led-gpios           =   <&gpio4 26 0>;\r\n    };\r\n    sja1000@08001A00 {\r\n        compatible  = \"weim,sja1000\";\r\n        reg         = <0x08001A00 0x1FF>;\r\n        nxp,external-clock-frequency = <16000000>;\r\n        nxp,tx-output-config = <0x16>;\r\n        nxp,no-comparator-bypass;\r\n        interrupt-parent    =   <&gpio4>;\r\n        interrupts          =   <17 0>;\r\n        int-gpios           =   <&gpio4 17 0>;\r\n        led-gpios           =   <&gpio4 27 0>;\r\n    };\r\n    sja1000@08001600 {\r\n        compatible  = \"weim,sja1000\";\r\n        reg         = <0x08001600 0x1FF>;\r\n        nxp,external-clock-frequency = <16000000>;\r\n        nxp,tx-output-config = <0x16>;\r\n        nxp,no-comparator-bypass;\r\n        interrupt-parent    =   <&gpio4>;\r\n        interrupts          =   <18 0>;\r\n        int-gpios           =   <&gpio4 18 0>;\r\n        led-gpios           =   <&gpio4 28 0>;\r\n    };\r\n    sja1000@08000E00 {\r\n        compatible  = \"weim,sja1000\";\r\n        reg         = <0x08000E00 0x1FF>;\r\n        nxp,external-clock-frequency = <16000000>;\r\n        nxp,tx-output-config = <0x16>;\r\n        nxp,no-comparator-bypass;\r\n        interrupt-parent    =   <&gpio4>;\r\n        interrupts          =   <19 0>;\r\n        int-gpios           =   <&gpio4 19 0>;\r\n        led-gpios           =   <&gpio4 29 0>;\r\n    };\r\n};<\/code><\/pre>\n\n\n\n
\u56db\u7247sja1000\u82af\u7247\u7684\u57fa\u5730\u5740\u8ba1\u7b97\u65b9\u5f0f\uff1aweim\u603b\u7ebf\u7684\u57fa\u5730\u5740\u4e3a0x08000000\uff0c\u7b2c\u4e00\u7247sja1000\u82af\u7247\u8bfb\u5199\u65f6DA1_8 \u5bf9\u5e94\u5730\u5740\/\u6570\u636e\u603b\u7ebf\u7684D0_7\uff0c\u5730\u5740\u8303\u56f4\u4e3a 0x08000000~0x080001FF\uff08\u5ffd\u7565DA0\u7684\u4fe1\u53f7\uff09\uff0c\u7531\u4e8eDA9_12\u5145\u5f53CS\u4fe1\u53f7\uff0c\u8bfb\u5199\u7b2c\u4e00\u7247sja1000\u82af\u7247\u65f6\uff0c\u9700\u8981\u4fdd\u6301DA9\u4e3a0\u3001DA10\u4e3a1\u3001DA11\u4e3a1\u3001DA12\u4e3a1\uff0c\u4ece\u800c\u7b2c\u4e00\u7247sja1000\u82af\u7247\u7684\u57fa\u5730\u5740\u4e3a0x08001C00\u3002\u540c\u7406\uff0c\u7b2c\u4e8c\u4e09\u56db\u7247sja1000\u82af\u7247\u7684\u57fa\u5730\u5740\u5206\u522b\u4e3a 0x08001A00 \u30010x08001600\u30010x08000E00\u3002
dts\u8d44\u6e90\u914d\u7f6e\u597d\u540e\uff0c\u9700\u8981\u5728\u5bf9\u5e94\u7684\u9a71\u52a8\u7a0b\u5e8f\u4e2d\u6b63\u786e\u5f15\u7528\u3002linux\u5185\u6838\u4e2d\u5df2\u7ecf\u6709\u4e86sja1000_platform\u9a71\u52a8\uff08\u4f4d\u4e8edriver\/net\/can\/sja1000\u76ee\u5f55\u4e0b\uff09\uff0c\u76f4\u63a5\u5728\u5b83\u7684\u57fa\u7840\u4e0a\u4fee\u6539\u4e0b\u5c31\u884c\u3002<\/p>\n\n\n\n
  1. of_device_id\u6dfb\u52a0
    \u8fd9\u91cc\u662f\u4e3a\u4e86\u9a71\u52a8\u80fd\u4e0edts\u6587\u4ef6\u4e2d\u201cweim,sja1000\u201d\u8d44\u6e90\u5339\u914d\u3002<\/li><\/ol>\n\n\n\n
    static struct of_device_id sp_of_table[] = {\r\n    {.compatible = \"weim,sja1000\"},\r\n    {},\r\n};\r\nMODULE_DEVICE_TABLE(of, sp_of_table);\r\n\r\nstatic struct platform_driver sp_driver = {\r\n    .probe = sp_probe,\r\n    .remove = sp_remove,\r\n    .driver = {\r\n        .name = DRV_NAME,\r\n        .owner = THIS_MODULE,\r\n        .of_match_table = sp_of_table,\r\n    },\r\n};<\/code><\/pre>\n\n\n\n
    2. \u521d\u59cb\u5316weim\u603b\u7ebf<\/strong>
    \u8fd9\u91cc\u901a\u8fc7\u4fee\u6539\u5bc4\u5b58\u5668\u5b8c\u6210\uff0c\u7a0b\u5e8f\u5728\u52a0\u8f7d\u9a71\u52a8\u7a0b\u5e8f\u65f6\u8c03\u7528\uff0c\u4e3b\u8981\u914d\u7f6eweim\u65f6\u949f\u3001\u4e2d\u65ad\u3001\u5730\u5740\/\u6570\u636e\u603b\u7ebf\u7aef\u53e3\u3001\u65f6\u5e8f\u63a7\u5236\u7b49\uff0c\u8be6\u89c1imx6\u6570\u636e\u624b\u518c\u3002<\/a><\/p>\n\n\n\n
    static int __init sp_init(void)\r\n{\r\n    mx6q_setup_weimcs();\r\n    return platform_driver_register(&sp_driver);\r\n}\r\nmodule_init(sp_init);\r\nvoid mx6q_setup_weimcs(void)\r\n{\r\n    unsigned int reg;\r\n\r\n    void __iomem *eim_reg = ioremap(WEIM_BASE_ADDR, 0x20);\r\n    void __iomem *ccm_reg = ioremap(CCM_BASE_ADDR, 0x80);\r\n\r\n    if(!eim_reg){\r\n        printk(\"error iomem eim_reg\\n\");\r\n    }\r\n    if(!ccm_reg){\r\n        printk(\"error iomem ccm_reg\\n\");\r\n    }\r\n\r\n    \/\/ divicer for aclk_eim_slow\r\n    reg = readl(ccm_reg + 0x1C);\r\n    reg &= ~(0x60000000);\r\n    reg |= 0x00380000;\r\n    writel(reg, ccm_reg + 0x1C);\r\n\r\n    \/* CLKCTL_CCGR6: Set emi_slow_clock to be on in all modes *\/\r\n    reg = readl(ccm_reg + 0x80);\r\n    reg |= 0x00000C00;\r\n    writel(reg, ccm_reg + 0x80);\r\n\r\n    \/* CS0GCR1:\r\n     *  [22-20 CSREC: minimum EIM clock cycles width of CS, OE and WE signals]\r\n     *  DSZ[16:18]:\r\n        001 16 bit port resides on DATA[15:0]\r\n     *  EIM Operation Mode: MUM=1, SRD = SWR = 0.\r\n     *      (Async write\/Async page read, multiplexed)\r\n     *\/\r\n    writel(0x07f13039, eim_reg);\r\n    writel(0x00001002, eim_reg + 0x00000004);\r\n\r\n    \/* CS0RCR1:\r\n     * Bit 31 30 29 28--27 26 25 24--23 22 21 20--19  18 17 16\r\n     *     0     RWSC                0  RADVA     RAL RADVN\r\n     * Bit 15 14 13 12--11 10 9--8 7 6 5 4--3 2 1 0\r\n     *     0  OEA       0  OEN   0 RCSA     0 RCSN\r\n     * CS0RCR2:\r\n     *  APR = 0 (Async Page Read);      [15]\r\n     *  PAT = 7 (9 EIM clock sycles)    [12:14]\r\n     *  RBEA = 7 (Read BE Assertion)    [4:6]\r\n     *  RBE = 1 (Read BE enable)        [3]\r\n     *  RBEN = 7 (Read BE Negation)     [0:2]\r\n     *\/\r\n    writel(0x18683372, eim_reg + 0x00000008);\r\n    writel(0x00000068, eim_reg + 0x0000000C);\r\n\r\n    \/*\r\n     * For EIM Write Configuration registers.\r\n     *\r\n     * CS0WCR1:\r\n     *  Bit 31  30   29 28 27 26 25 24 23 22 21 20--19 18 17 16--15\r\n     *      WAL WBED WWSC              WADVA    WADVN     WBEA\r\n     *      1   1    01 1000           011      0--00     11--1\r\n     *  Bit 14 13 12 11 10 9 8-- 7 6 5 4 3 2 1 0\r\n     *      WBEN     WEA     WEN   WCSA  WCSN\r\n     *      111      111     1--11   100   110\r\n     * CS0WCR2:\r\n     *  WBCDD = 0\r\n     *\/\r\n    writel(0xd863ffe6, eim_reg + 0x00000010);\r\n    writel(0x00000000, eim_reg + 0x00000014);\r\n\r\n    printk(\"WEIM init end, CS0GCR1_is %x\\n\", readl(eim_reg));\r\n\r\n    iounmap(eim_reg);\r\n    iounmap(ccm_reg);\r\n}<\/code><\/pre>\n\n\n\n
    3\u3001probe\u51fd\u6570\u4fee\u6539<\/strong>
    probe\u51fd\u6570\u4e2d\u4e3b\u8981\u9488\u5bf9\u6dfb\u52a0\u4e86rst\u5f15\u811a\u548cled\u5f15\u811a\uff0c\u5176\u5b83\u672a\u505a\u6539\u53d8\u3002\u53ef\u4ee5\u770b\u5230\uff0cprobe\u51fd\u6570\u4e2d\uff0c\u7533\u8bf7\u4e86sja1000\u8bbe\u5907\u7684\u603b\u7ebf\u8d44\u6e90\uff0c\u6839\u636eGPIO\u4e2d\u65ad\u5f15\u811a\u53f7\u7533\u8bf7\u4e86\u7ec8\u7aef\uff0c\u7136\u540e\u5c06platform\u8bbe\u5907\u6ce8\u518c\u5230sja1000\u9a71\u52a8\u4e2d\u3002<\/p>\n\n\n\n
    static int sp_probe(struct platform_device *pdev)\r\n{\r\n    ...\r\n    res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);\r\n    if (!res_mem)\r\n        return -ENODEV;\r\n\r\n    if (!devm_request_mem_region(&pdev->dev, res_mem->start, resource_size(res_mem), DRV_NAME))\r\n        return -EBUSY;\r\n\r\n    addr = devm_ioremap_nocache(&pdev->dev, res_mem->start, resource_size(res_mem));\r\n    if (!addr)\r\n        return -ENOMEM;\r\n\r\n    if (of){\r\n        reset_pin   = of_get_named_gpio(of, \"rst-gpios\", 0);\r\n        irq_pin     = of_get_named_gpio(of, \"int-gpios\", 0);\r\n        led_pin     = of_get_named_gpio(of, \"led-gpios\", 0);\r\n        irq = irq_of_parse_and_map(of, 0);\r\n\r\n        if(gpio_is_valid(reset_pin)) {\r\n            err = devm_gpio_request_one(&pdev->dev, reset_pin,\r\n                    GPIOF_OUT_INIT_HIGH, \"sja1000 reset\");\r\n            if (err) {\r\n                dev_err(&pdev->dev,\r\n                    \"Failed to request GPIO %d as reset pin, error %d\\n\",\r\n                    reset_pin, err);\r\n            }\r\n        }\r\n        if(gpio_is_valid(irq_pin)){\r\n            err = devm_gpio_request_one(&pdev->dev, irq_pin,\r\n                    GPIOF_IN, \"sja1000 int\");\r\n            if (err) {\r\n                dev_err(&pdev->dev,\r\n                    \"Failed to request GPIO %d as irq pin, error %d\\n\",\r\n                    irq_pin, err);\r\n            }\r\n        }\r\n        if(gpio_is_valid(led_pin)) {\r\n            err = devm_gpio_request_one(&pdev->dev, led_pin,\r\n                    GPIOF_OUT_INIT_LOW, \"sja1000 led\");\r\n            if (err) {\r\n                dev_err(&pdev->dev,\r\n                    \"Failed to request GPIO %d as led pin, error %d\\n\",\r\n                    irq_pin, err);\r\n            }\r\n        }\r\n    }else{\r\n        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);\r\n    }\r\n\r\n    ...\r\n    dev = alloc_sja1000dev(0);\r\n    ...\r\n    priv = netdev_priv(dev);\r\n\r\n    if (res_irq) {\r\n        irq = res_irq->start;\r\n        priv->irq_flags = res_irq->flags & IRQF_TRIGGER_MASK;\r\n        if (res_irq->flags & IORESOURCE_IRQ_SHAREABLE)\r\n            priv->irq_flags |= IRQF_SHARED;\r\n    } else {\r\n        priv->irq_flags |= IRQF_TRIGGER_LOW;\r\n    }\r\n\r\n    dev->irq = irq;\r\n    priv->reg_base  = addr;\r\n    priv->irq_pin   = irq_pin;\r\n    priv->reset_pin = reset_pin;\r\n    priv->led_pin   = led_pin;\r\n    priv->led_status = 0;\r\n    priv->wdataOffset = res_mem->start - 0x08000000;        \/* add write data offset *\/\r\n\r\n    if (of)\r\n        sp_populate_of(priv, of);\r\n    else\r\n        sp_populate(priv, pdata, res_mem->flags);\r\n\r\n    platform_set_drvdata(pdev, dev);\r\n    SET_NETDEV_DEV(dev, &pdev->dev);\r\n\r\n    err = register_sja1000dev(dev);\r\n    ...\r\n}<\/code><\/pre>\n\n\n\n
    4. read\/write \u5730\u5740\u504f\u79fb<\/strong>
    \u7531\u4e8e\u4f7f\u7528\u7684\u662fDA1_8\u5f15\u811a\uff08DA9_12\u5145\u5f53\u4e86CS\u4fe1\u53f7\uff09\uff0c\u5176\u8bfb\u5199\u5730\u5740\u80af\u5b9a\u4e0d\u80fd\u76f4\u63a5\u5728\u57fa\u5730\u5740\u4e0a\u4e86\u3002\u4fee\u6539sja100_platform\u4e2d\u7684write8\u548cread8\u51fd\u6570\uff0c\u5b8c\u6210\u8bfb\u5199\u7684\u5730\u5740\u504f\u79fb\u3002<\/p>\n\n\n\n
    static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg)\r\n{\r\n    u16 data;\r\n    data = ioread16(priv->reg_base + reg*2);\r\n    return data>>1;\r\n}\r\n\r\nstatic void sp_write_reg8(const struct sja1000_priv *priv, int reg, u8 val)\r\n{\r\n    u16 data=val;\r\n    data = data*2;\r\n    iowrite16(data + priv->wdataOffset, priv->reg_base + reg*2);\r\n}<\/code><\/pre>\n\n\n\n
    \u5b8c\u6574\u7684\u9a71\u52a8\u7a0b\u5e8f\u89c1https:\/\/gitee.com\/westlor\/imx6_sja1000<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \n
    \u6709\u65f6\u4f1a\u9700\u8981\u6269\u5c55\u591a\u4e2aCAN\u63a5\u53e3\uff0c\u5728CAN\u8bbe<\/h3>\n<\/div>\n
    \u9605\u8bfb\u66f4\u591a<\/a><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[121],"tags":[],"_links":{"self":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts\/975"}],"collection":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=975"}],"version-history":[{"count":1,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts\/975\/revisions"}],"predecessor-version":[{"id":982,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=\/wp\/v2\/posts\/975\/revisions\/982"}],"wp:attachment":[{"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=975"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.recologypower.com:9080\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}