target/linux/ipq40xx/patches-4.19/700-net-add-qualcomm-mdio.patch

   1 --- a/drivers/net/phy/Kconfig
   2 +++ b/drivers/net/phy/Kconfig
   3 @@ -519,6 +519,13 @@ config XILINX_GMII2RGMII
   4           the Reduced Gigabit Media Independent Interface(RGMII) between
   5           Ethernet physical media devices and the Gigabit Ethernet controller.
   6
   7 +config MDIO_IPQ40XX
   8 +       tristate "Qualcomm Atheros ipq40xx MDIO interface"
   9 +       depends on HAS_IOMEM && OF
  10 +       ---help---
  11 +         This driver supports the MDIO interface found in Qualcomm
  12 +         Atheros ipq40xx Soc chip.
  13 +
  14  endif # PHYLIB
  15
  16  config MICREL_KS8995MA
  17 --- a/drivers/net/phy/Makefile
  18 +++ b/drivers/net/phy/Makefile
  19 @@ -48,6 +48,7 @@ obj-$(CONFIG_MDIO_CAVIUM)     += mdio-cavium
  20  obj-$(CONFIG_MDIO_GPIO)                += mdio-gpio.o
  21  obj-$(CONFIG_MDIO_HISI_FEMAC)  += mdio-hisi-femac.o
  22  obj-$(CONFIG_MDIO_I2C)         += mdio-i2c.o
  23 +obj-$(CONFIG_MDIO_IPQ40XX)     += mdio-ipq40xx.o
  24  obj-$(CONFIG_MDIO_MOXART)      += mdio-moxart.o
  25  obj-$(CONFIG_MDIO_MSCC_MIIM)   += mdio-mscc-miim.o
  26  obj-$(CONFIG_MDIO_OCTEON)      += mdio-octeon.o
  27 --- /dev/null
  28 +++ b/drivers/net/phy/mdio-ipq40xx.c
  29 @@ -0,0 +1,201 @@
  30 +/*
  31 + * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
  32 + *
  33 + * Permission to use, copy, modify, and/or distribute this software for
  34 + * any purpose with or without fee is hereby granted, provided that the
  35 + * above copyright notice and this permission notice appear in all copies.
  36 + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  37 + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  38 + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  39 + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  40 + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  41 + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  42 + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  43 + */
  44 +
  45 +#include <linux/delay.h>
  46 +#include <linux/kernel.h>
  47 +#include <linux/module.h>
  48 +#include <linux/mutex.h>
  49 +#include <linux/io.h>
  50 +#include <linux/of_address.h>
  51 +#include <linux/of_mdio.h>
  52 +#include <linux/phy.h>
  53 +#include <linux/platform_device.h>
  54 +
  55 +#define MDIO_CTRL_0_REG                0x40
  56 +#define MDIO_CTRL_1_REG                0x44
  57 +#define MDIO_CTRL_2_REG                0x48
  58 +#define MDIO_CTRL_3_REG                0x4c
  59 +#define MDIO_CTRL_4_REG                0x50
  60 +#define MDIO_CTRL_4_ACCESS_BUSY                BIT(16)
  61 +#define MDIO_CTRL_4_ACCESS_START               BIT(8)
  62 +#define MDIO_CTRL_4_ACCESS_CODE_READ           0
  63 +#define MDIO_CTRL_4_ACCESS_CODE_WRITE  1
  64 +#define CTRL_0_REG_DEFAULT_VALUE       0x150FF
  65 +
  66 +#define IPQ40XX_MDIO_RETRY     1000
  67 +#define IPQ40XX_MDIO_DELAY     10
  68 +
  69 +struct ipq40xx_mdio_data {
  70 +       struct mii_bus  *mii_bus;
  71 +       void __iomem    *membase;
  72 +       int             phy_irq[PHY_MAX_ADDR];
  73 +       struct device   *dev;
  74 +};
  75 +
  76 +static int ipq40xx_mdio_wait_busy(struct ipq40xx_mdio_data *am)
  77 +{
  78 +       int i;
  79 +
  80 +       for (i = 0; i < IPQ40XX_MDIO_RETRY; i++) {
  81 +               unsigned int busy;
  82 +
  83 +               busy = readl(am->membase + MDIO_CTRL_4_REG) &
  84 +                       MDIO_CTRL_4_ACCESS_BUSY;
  85 +               if (!busy)
  86 +                       return 0;
  87 +
  88 +               /* BUSY might take to be cleard by 15~20 times of loop */
  89 +               udelay(IPQ40XX_MDIO_DELAY);
  90 +       }
  91 +
  92 +       dev_err(am->dev, "%s: MDIO operation timed out\n", am->mii_bus->name);
  93 +
  94 +       return -ETIMEDOUT;
  95 +}
  96 +
  97 +static int ipq40xx_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
  98 +{
  99 +       struct ipq40xx_mdio_data *am = bus->priv;
 100 +       int value = 0;
 101 +       unsigned int cmd = 0;
 102 +
 103 +       lockdep_assert_held(&bus->mdio_lock);
 104 +
 105 +       if (ipq40xx_mdio_wait_busy(am))
 106 +               return -ETIMEDOUT;
 107 +
 108 +       /* issue the phy address and reg */
 109 +       writel((mii_id << 8) | regnum, am->membase + MDIO_CTRL_1_REG);
 110 +
 111 +       cmd = MDIO_CTRL_4_ACCESS_START|MDIO_CTRL_4_ACCESS_CODE_READ;
 112 +
 113 +       /* issue read command */
 114 +       writel(cmd, am->membase + MDIO_CTRL_4_REG);
 115 +
 116 +       /* Wait read complete */
 117 +       if (ipq40xx_mdio_wait_busy(am))
 118 +               return -ETIMEDOUT;
 119 +
 120 +       /* Read data */
 121 +       value = readl(am->membase + MDIO_CTRL_3_REG);
 122 +
 123 +       return value;
 124 +}
 125 +
 126 +static int ipq40xx_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
 127 +                           u16 value)
 128 +{
 129 +       struct ipq40xx_mdio_data *am = bus->priv;
 130 +       unsigned int cmd = 0;
 131 +
 132 +       lockdep_assert_held(&bus->mdio_lock);
 133 +
 134 +       if (ipq40xx_mdio_wait_busy(am))
 135 +               return -ETIMEDOUT;
 136 +
 137 +       /* issue the phy address and reg */
 138 +       writel((mii_id << 8) | regnum, am->membase + MDIO_CTRL_1_REG);
 139 +
 140 +       /* issue write data */
 141 +       writel(value, am->membase + MDIO_CTRL_2_REG);
 142 +
 143 +       cmd = MDIO_CTRL_4_ACCESS_START|MDIO_CTRL_4_ACCESS_CODE_WRITE;
 144 +       /* issue write command */
 145 +       writel(cmd, am->membase + MDIO_CTRL_4_REG);
 146 +
 147 +       /* Wait write complete */
 148 +       if (ipq40xx_mdio_wait_busy(am))
 149 +               return -ETIMEDOUT;
 150 +
 151 +       return 0;
 152 +}
 153 +
 154 +static int ipq40xx_mdio_probe(struct platform_device *pdev)
 155 +{
 156 +       struct ipq40xx_mdio_data *am;
 157 +       struct resource *res;
 158 +       int i;
 159 +
 160 +       am = devm_kzalloc(&pdev->dev, sizeof(*am), GFP_KERNEL);
 161 +       if (!am)
 162 +               return -ENOMEM;
 163 +
 164 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 165 +       if (!res) {
 166 +               dev_err(&pdev->dev, "no iomem resource found\n");
 167 +               return -ENXIO;
 168 +       }
 169 +
 170 +       am->membase = devm_ioremap_resource(&pdev->dev, res);
 171 +       if (IS_ERR(am->membase)) {
 172 +               dev_err(&pdev->dev, "unable to ioremap registers\n");
 173 +               return PTR_ERR(am->membase);
 174 +       }
 175 +
 176 +       am->mii_bus = devm_mdiobus_alloc(&pdev->dev);
 177 +       if (!am->mii_bus)
 178 +               return  -ENOMEM;
 179 +
 180 +       writel(CTRL_0_REG_DEFAULT_VALUE, am->membase + MDIO_CTRL_0_REG);
 181 +
 182 +       am->mii_bus->name = "ipq40xx_mdio";
 183 +       am->mii_bus->read = ipq40xx_mdio_read;
 184 +       am->mii_bus->write = ipq40xx_mdio_write;
 185 +       am->mii_bus->priv = am;
 186 +       am->mii_bus->parent = &pdev->dev;
 187 +       snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
 188 +
 189 +       for (i = 0; i < PHY_MAX_ADDR; i++)
 190 +               am->phy_irq[i] = PHY_POLL;
 191 +
 192 +       memcpy(am->mii_bus->irq, am->phy_irq, sizeof(am->phy_irq));
 193 +       am->dev = &pdev->dev;
 194 +       platform_set_drvdata(pdev, am);
 195 +
 196 +       return of_mdiobus_register(am->mii_bus, pdev->dev.of_node);
 197 +}
 198 +
 199 +static int ipq40xx_mdio_remove(struct platform_device *pdev)
 200 +{
 201 +       struct ipq40xx_mdio_data *am = platform_get_drvdata(pdev);
 202 +
 203 +       mdiobus_unregister(am->mii_bus);
 204 +
 205 +       return 0;
 206 +}
 207 +
 208 +static const struct of_device_id ipq40xx_mdio_dt_ids[] = {
 209 +       { .compatible = "qcom,ipq4019-mdio" },
 210 +       { }
 211 +};
 212 +MODULE_DEVICE_TABLE(of, ipq40xx_mdio_dt_ids);
 213 +
 214 +static struct platform_driver ipq40xx_mdio_driver = {
 215 +       .probe = ipq40xx_mdio_probe,
 216 +       .remove = ipq40xx_mdio_remove,
 217 +       .driver = {
 218 +               .name = "ipq40xx-mdio",
 219 +               .of_match_table = ipq40xx_mdio_dt_ids,
 220 +       },
 221 +};
 222 +
 223 +module_platform_driver(ipq40xx_mdio_driver);
 224 +
 225 +#define DRV_VERSION     "1.0"
 226 +
 227 +MODULE_DESCRIPTION("IPQ40XX MDIO interface driver");
 228 +MODULE_AUTHOR("Qualcomm Atheros");
 229 +MODULE_VERSION(DRV_VERSION);
 230 +MODULE_LICENSE("Dual BSD/GPL");