cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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spl2sw_mdio.c (3314B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Copyright Sunplus Technology Co., Ltd.
      3 *       All rights reserved.
      4 */
      5
      6#include <linux/platform_device.h>
      7#include <linux/netdevice.h>
      8#include <linux/bitfield.h>
      9#include <linux/of_mdio.h>
     10
     11#include "spl2sw_register.h"
     12#include "spl2sw_define.h"
     13#include "spl2sw_mdio.h"
     14
     15#define SPL2SW_MDIO_READ_CMD           0x02
     16#define SPL2SW_MDIO_WRITE_CMD          0x01
     17
     18static int spl2sw_mdio_access(struct spl2sw_common *comm, u8 cmd, u8 addr, u8 regnum, u16 wdata)
     19{
     20	u32 reg, reg2;
     21	u32 val;
     22	int ret;
     23
     24	/* Note that addr (of phy) should match either ext_phy0_addr
     25	 * or ext_phy1_addr, or mdio commands won't be sent out.
     26	 */
     27	reg = readl(comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
     28	reg &= ~MAC_EXT_PHY0_ADDR;
     29	reg |= FIELD_PREP(MAC_EXT_PHY0_ADDR, addr);
     30
     31	reg2 = FIELD_PREP(MAC_CPU_PHY_WT_DATA, wdata) | FIELD_PREP(MAC_CPU_PHY_CMD, cmd) |
     32	       FIELD_PREP(MAC_CPU_PHY_REG_ADDR, regnum) | FIELD_PREP(MAC_CPU_PHY_ADDR, addr);
     33
     34	/* Set ext_phy0_addr and then issue mdio command.
     35	 * No interrupt is allowed in between.
     36	 */
     37	spin_lock_irq(&comm->mdio_lock);
     38	writel(reg, comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
     39	writel(reg2, comm->l2sw_reg_base + L2SW_PHY_CNTL_REG0);
     40	spin_unlock_irq(&comm->mdio_lock);
     41
     42	ret = read_poll_timeout(readl, val, val & cmd, 1, 1000, true,
     43				comm->l2sw_reg_base + L2SW_PHY_CNTL_REG1);
     44
     45	/* Set ext_phy0_addr back to 31 to prevent
     46	 * from sending mdio command to phy by
     47	 * hardware auto-mdio function.
     48	 */
     49	reg = readl(comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
     50	reg &= ~MAC_EXT_PHY0_ADDR;
     51	reg |= FIELD_PREP(MAC_EXT_PHY0_ADDR, 31);
     52	writel(reg, comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
     53
     54	if (ret == 0)
     55		return val >> 16;
     56	else
     57		return ret;
     58}
     59
     60static int spl2sw_mii_read(struct mii_bus *bus, int addr, int regnum)
     61{
     62	struct spl2sw_common *comm = bus->priv;
     63
     64	if (regnum & MII_ADDR_C45)
     65		return -EOPNOTSUPP;
     66
     67	return spl2sw_mdio_access(comm, SPL2SW_MDIO_READ_CMD, addr, regnum, 0);
     68}
     69
     70static int spl2sw_mii_write(struct mii_bus *bus, int addr, int regnum, u16 val)
     71{
     72	struct spl2sw_common *comm = bus->priv;
     73	int ret;
     74
     75	if (regnum & MII_ADDR_C45)
     76		return -EOPNOTSUPP;
     77
     78	ret = spl2sw_mdio_access(comm, SPL2SW_MDIO_WRITE_CMD, addr, regnum, val);
     79	if (ret < 0)
     80		return ret;
     81
     82	return 0;
     83}
     84
     85u32 spl2sw_mdio_init(struct spl2sw_common *comm)
     86{
     87	struct device_node *mdio_np;
     88	struct mii_bus *mii_bus;
     89	int ret;
     90
     91	/* Get mdio child node. */
     92	mdio_np = of_get_child_by_name(comm->pdev->dev.of_node, "mdio");
     93	if (!mdio_np) {
     94		dev_err(&comm->pdev->dev, "No mdio child node found!\n");
     95		return -ENODEV;
     96	}
     97
     98	/* Allocate and register mdio bus. */
     99	mii_bus = devm_mdiobus_alloc(&comm->pdev->dev);
    100	if (!mii_bus) {
    101		ret = -ENOMEM;
    102		goto out;
    103	}
    104
    105	mii_bus->name = "sunplus_mii_bus";
    106	mii_bus->parent = &comm->pdev->dev;
    107	mii_bus->priv = comm;
    108	mii_bus->read = spl2sw_mii_read;
    109	mii_bus->write = spl2sw_mii_write;
    110	snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&comm->pdev->dev));
    111
    112	ret = of_mdiobus_register(mii_bus, mdio_np);
    113	if (ret) {
    114		dev_err(&comm->pdev->dev, "Failed to register mdiobus!\n");
    115		goto out;
    116	}
    117
    118	comm->mii_bus = mii_bus;
    119
    120out:
    121	of_node_put(mdio_np);
    122	return ret;
    123}
    124
    125void spl2sw_mdio_remove(struct spl2sw_common *comm)
    126{
    127	if (comm->mii_bus) {
    128		mdiobus_unregister(comm->mii_bus);
    129		comm->mii_bus = NULL;
    130	}
    131}