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878a20aa15
Prevent a NULL pointer dereference in the probe path by checking the return valud of dev_read_addr_ptr() against NULL. Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2020 NXP
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <miiphy.h>
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#include <asm/io.h>
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#include <fsl_memac.h>
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#ifdef CONFIG_SYS_MEMAC_LITTLE_ENDIAN
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#define memac_out_32(a, v) out_le32(a, v)
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#define memac_clrbits_32(a, v) clrbits_le32(a, v)
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#define memac_setbits_32(a, v) setbits_le32(a, v)
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#else
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#define memac_out_32(a, v) out_be32(a, v)
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#define memac_clrbits_32(a, v) clrbits_be32(a, v)
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#define memac_setbits_32(a, v) setbits_be32(a, v)
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#endif
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static u32 memac_in_32(u32 *reg)
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{
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#ifdef CONFIG_SYS_MEMAC_LITTLE_ENDIAN
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return in_le32(reg);
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#else
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return in_be32(reg);
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#endif
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}
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struct fsl_ls_mdio_priv {
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void *regs_base;
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};
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static u32 fsl_ls_mdio_setup_operation(struct udevice *dev, int addr, int devad,
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int reg)
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{
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struct fsl_ls_mdio_priv *priv = dev_get_priv(dev);
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struct memac_mdio_controller *regs;
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u32 mdio_ctl;
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u32 c45 = 1;
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regs = (struct memac_mdio_controller *)(priv->regs_base);
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if (devad == MDIO_DEVAD_NONE) {
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c45 = 0; /* clause 22 */
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devad = reg & 0x1f;
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memac_clrbits_32(®s->mdio_stat, MDIO_STAT_ENC);
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} else {
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memac_setbits_32(®s->mdio_stat, MDIO_STAT_ENC);
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}
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/* Wait till the bus is free */
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while ((memac_in_32(®s->mdio_stat)) & MDIO_STAT_BSY)
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;
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/* Set the Port and Device Addrs */
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mdio_ctl = MDIO_CTL_PORT_ADDR(addr) | MDIO_CTL_DEV_ADDR(devad);
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memac_out_32(®s->mdio_ctl, mdio_ctl);
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/* Set the register address */
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if (c45)
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memac_out_32(®s->mdio_addr, reg & 0xffff);
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/* Wait till the bus is free */
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while ((memac_in_32(®s->mdio_stat)) & MDIO_STAT_BSY)
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;
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return mdio_ctl;
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}
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static int dm_fsl_ls_mdio_read(struct udevice *dev, int addr,
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int devad, int reg)
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{
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struct fsl_ls_mdio_priv *priv = dev_get_priv(dev);
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struct memac_mdio_controller *regs;
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u32 mdio_ctl;
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regs = (struct memac_mdio_controller *)(priv->regs_base);
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mdio_ctl = fsl_ls_mdio_setup_operation(dev, addr, devad, reg);
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/* Initiate the read */
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mdio_ctl |= MDIO_CTL_READ;
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memac_out_32(®s->mdio_ctl, mdio_ctl);
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/* Wait till the MDIO write is complete */
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while ((memac_in_32(®s->mdio_stat)) & MDIO_STAT_BSY)
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;
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/* Return all Fs if nothing was there */
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if (memac_in_32(®s->mdio_stat) & MDIO_STAT_RD_ER)
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return 0xffff;
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return memac_in_32(®s->mdio_data) & 0xffff;
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}
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static int dm_fsl_ls_mdio_write(struct udevice *dev, int addr, int devad,
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int reg, u16 val)
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{
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struct fsl_ls_mdio_priv *priv = dev_get_priv(dev);
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struct memac_mdio_controller *regs;
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regs = (struct memac_mdio_controller *)(priv->regs_base);
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fsl_ls_mdio_setup_operation(dev, addr, devad, reg);
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/* Write the value to the register */
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memac_out_32(®s->mdio_data, MDIO_DATA(val));
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/* Wait till the MDIO write is complete */
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while ((memac_in_32(®s->mdio_stat)) & MDIO_STAT_BSY)
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;
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return 0;
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}
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static const struct mdio_ops fsl_ls_mdio_ops = {
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.read = dm_fsl_ls_mdio_read,
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.write = dm_fsl_ls_mdio_write,
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};
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static int fsl_ls_mdio_probe(struct udevice *dev)
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{
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struct fsl_ls_mdio_priv *priv = dev_get_priv(dev);
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struct memac_mdio_controller *regs;
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priv->regs_base = dev_read_addr_ptr(dev);
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if (!priv->regs_base)
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return -ENODEV;
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regs = (struct memac_mdio_controller *)(priv->regs_base);
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memac_setbits_32(®s->mdio_stat,
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MDIO_STAT_CLKDIV(258) | MDIO_STAT_NEG);
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return 0;
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}
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static const struct udevice_id fsl_ls_mdio_of_ids[] = {
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{ .compatible = "fsl,ls-mdio" },
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};
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U_BOOT_DRIVER(fsl_ls_mdio) = {
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.name = "fsl_ls_mdio",
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.id = UCLASS_MDIO,
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.of_match = fsl_ls_mdio_of_ids,
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.probe = fsl_ls_mdio_probe,
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.ops = &fsl_ls_mdio_ops,
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.priv_auto = sizeof(struct fsl_ls_mdio_priv),
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};
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