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eab18b3b06
NXP's mEMAC reference manual, Chapter 6.5.5 "MDIO Ethernet Management
Interface usage", specifies to poll the BSY (0) bit in the CFG/STAT
register to wait until a transaction has finished, not bit 31 in the
data register.
In the Linux kernel, this has already been fixed in commit 26eee0210ad7
("net/fsl: fix a bug in xgmac_mdio").
This patch changes the register in the fman_mdio and fsl_ls_mdio
drivers.
As the MDIO_DATA_BSY define is no longer in use, this patch also removes
its definition from the fsl_memac header.
Signed-off-by: Markus Koch <markus@notsyncing.net>
Reviewed-by: Camelia Groza <camelia.groza@nxp.com>
344 lines
8.3 KiB
C
344 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2012 Freescale Semiconductor, Inc.
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* Andy Fleming <afleming@gmail.com>
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* Roy Zang <tie-fei.zang@freescale.com>
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* Some part is taken from tsec.c
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*/
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#include <common.h>
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#include <miiphy.h>
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#include <phy.h>
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#include <asm/io.h>
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#include <fsl_memac.h>
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#include <fm_eth.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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#ifdef CONFIG_DM_ETH
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struct fm_mdio_priv {
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struct memac_mdio_controller *regs;
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};
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#endif
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#define MAX_NUM_RETRIES 1000
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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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/*
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* Wait until the MDIO bus is free
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*/
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static int memac_wait_until_free(struct memac_mdio_controller *regs)
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{
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unsigned int timeout = MAX_NUM_RETRIES;
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while ((memac_in_32(®s->mdio_stat) & MDIO_STAT_BSY) && timeout--)
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;
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if (!timeout) {
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printf("timeout waiting for MDIO bus to be free\n");
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return -ETIMEDOUT;
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}
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return 0;
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}
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/*
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* Wait till the MDIO read or write operation is complete
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*/
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static int memac_wait_until_done(struct memac_mdio_controller *regs)
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{
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unsigned int timeout = MAX_NUM_RETRIES;
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while ((memac_in_32(®s->mdio_stat) & MDIO_STAT_BSY) && timeout--)
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;
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if (!timeout) {
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printf("timeout waiting for MDIO operation to complete\n");
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return -ETIMEDOUT;
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}
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return 0;
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}
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/*
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* Write value to the PHY for this device to the register at regnum, waiting
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* until the write is done before it returns. All PHY configuration has to be
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* done through the TSEC1 MIIM regs
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*/
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int memac_mdio_write(struct mii_dev *bus, int port_addr, int dev_addr,
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int regnum, u16 value)
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{
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struct memac_mdio_controller *regs;
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u32 mdio_ctl;
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u32 c45 = 1; /* Default to 10G interface */
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int err;
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#ifndef CONFIG_DM_ETH
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regs = bus->priv;
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#else
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struct fm_mdio_priv *priv;
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if (!bus->priv)
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return -EINVAL;
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priv = dev_get_priv(bus->priv);
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regs = priv->regs;
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debug("memac_mdio_write(regs %p, port %d, dev %d, reg %d, val %#x)\n",
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regs, port_addr, dev_addr, regnum, value);
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#endif
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if (dev_addr == MDIO_DEVAD_NONE) {
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c45 = 0; /* clause 22 */
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dev_addr = regnum & 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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err = memac_wait_until_free(regs);
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if (err)
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return err;
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/* Set the port and dev addr */
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mdio_ctl = MDIO_CTL_PORT_ADDR(port_addr) | MDIO_CTL_DEV_ADDR(dev_addr);
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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, regnum & 0xffff);
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err = memac_wait_until_free(regs);
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if (err)
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return err;
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/* Write the value to the register */
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memac_out_32(®s->mdio_data, MDIO_DATA(value));
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err = memac_wait_until_done(regs);
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if (err)
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return err;
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return 0;
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}
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/*
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* Reads from register regnum in the PHY for device dev, returning the value.
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* Clears miimcom first. All PHY configuration has to be done through the
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* TSEC1 MIIM regs
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*/
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int memac_mdio_read(struct mii_dev *bus, int port_addr, int dev_addr,
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int regnum)
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{
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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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int err;
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#ifndef CONFIG_DM_ETH
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regs = bus->priv;
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#else
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struct fm_mdio_priv *priv;
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if (!bus->priv)
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return -EINVAL;
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priv = dev_get_priv(bus->priv);
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regs = priv->regs;
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#endif
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if (dev_addr == MDIO_DEVAD_NONE) {
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#ifndef CONFIG_DM_ETH
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if (!strcmp(bus->name, DEFAULT_FM_TGEC_MDIO_NAME))
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return 0xffff;
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#endif
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c45 = 0; /* clause 22 */
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dev_addr = regnum & 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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err = memac_wait_until_free(regs);
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if (err)
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return err;
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/* Set the Port and Device Addrs */
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mdio_ctl = MDIO_CTL_PORT_ADDR(port_addr) | MDIO_CTL_DEV_ADDR(dev_addr);
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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, regnum & 0xffff);
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err = memac_wait_until_free(regs);
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if (err)
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return err;
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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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err = memac_wait_until_done(regs);
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if (err)
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return err;
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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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int memac_mdio_reset(struct mii_dev *bus)
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{
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return 0;
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}
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#ifndef CONFIG_DM_ETH
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int fm_memac_mdio_init(struct bd_info *bis, struct memac_mdio_info *info)
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{
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struct mii_dev *bus = mdio_alloc();
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if (!bus) {
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printf("Failed to allocate FM TGEC MDIO bus\n");
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return -1;
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}
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bus->read = memac_mdio_read;
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bus->write = memac_mdio_write;
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bus->reset = memac_mdio_reset;
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strcpy(bus->name, info->name);
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bus->priv = info->regs;
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/*
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* On some platforms like B4860, default value of MDIO_CLK_DIV bits
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* in mdio_stat(mdio_cfg) register generates MDIO clock too high
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* (much higher than 2.5MHz), violating the IEEE specs.
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* On other platforms like T1040, default value of MDIO_CLK_DIV bits
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* is zero, so MDIO clock is disabled.
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* So, for proper functioning of MDIO, MDIO_CLK_DIV bits needs to
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* be properly initialized.
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* NEG bit default should be '1' as per FMAN-v3 RM, but on platform
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* like T2080QDS, this bit default is '0', which leads to MDIO failure
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* on XAUI PHY, so set this bit definitely.
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*/
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memac_setbits_32(
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&((struct memac_mdio_controller *)info->regs)->mdio_stat,
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MDIO_STAT_CLKDIV(258) | MDIO_STAT_NEG);
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return mdio_register(bus);
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}
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#else /* CONFIG_DM_ETH */
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#if defined(CONFIG_PHYLIB) && defined(CONFIG_DM_MDIO)
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static int fm_mdio_read(struct udevice *dev, int addr, int devad, int reg)
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{
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struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
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NULL;
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if (pdata && pdata->mii_bus)
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return memac_mdio_read(pdata->mii_bus, addr, devad, reg);
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return -1;
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}
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static int fm_mdio_write(struct udevice *dev, int addr, int devad, int reg,
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u16 val)
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{
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struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
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NULL;
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if (pdata && pdata->mii_bus)
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return memac_mdio_write(pdata->mii_bus, addr, devad, reg, val);
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return -1;
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}
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static int fm_mdio_reset(struct udevice *dev)
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{
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struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
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NULL;
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if (pdata && pdata->mii_bus)
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return memac_mdio_reset(pdata->mii_bus);
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return -1;
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}
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static const struct mdio_ops fm_mdio_ops = {
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.read = fm_mdio_read,
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.write = fm_mdio_write,
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.reset = fm_mdio_reset,
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};
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static const struct udevice_id fm_mdio_ids[] = {
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{ .compatible = "fsl,fman-memac-mdio" },
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{}
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};
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static int fm_mdio_probe(struct udevice *dev)
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{
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struct fm_mdio_priv *priv = (dev) ? dev_get_priv(dev) : NULL;
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struct mdio_perdev_priv *pdata = (dev) ? dev_get_uclass_priv(dev) :
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NULL;
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if (!dev) {
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printf("%s dev = NULL\n", __func__);
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return -1;
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}
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if (!priv) {
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printf("dev_get_priv(dev %p) = NULL\n", dev);
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return -1;
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}
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priv->regs = (void *)(uintptr_t)dev_read_addr(dev);
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debug("%s priv %p @ regs %p, pdata %p\n", __func__,
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priv, priv->regs, pdata);
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/*
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* On some platforms like B4860, default value of MDIO_CLK_DIV bits
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* in mdio_stat(mdio_cfg) register generates MDIO clock too high
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* (much higher than 2.5MHz), violating the IEEE specs.
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* On other platforms like T1040, default value of MDIO_CLK_DIV bits
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* is zero, so MDIO clock is disabled.
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* So, for proper functioning of MDIO, MDIO_CLK_DIV bits needs to
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* be properly initialized.
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* The default NEG bit should be '1' as per FMANv3 RM, but on platforms
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* like T2080QDS, this bit default is '0', which leads to MDIO failure
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* on XAUI PHY, so set this bit definitely.
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*/
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if (priv && priv->regs && priv->regs->mdio_stat)
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memac_setbits_32(&priv->regs->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 int fm_mdio_remove(struct udevice *dev)
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{
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return 0;
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}
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U_BOOT_DRIVER(fman_mdio) = {
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.name = "fman_mdio",
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.id = UCLASS_MDIO,
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.of_match = fm_mdio_ids,
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.probe = fm_mdio_probe,
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.remove = fm_mdio_remove,
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.ops = &fm_mdio_ops,
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.priv_auto = sizeof(struct fm_mdio_priv),
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.plat_auto = sizeof(struct mdio_perdev_priv),
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};
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#endif /* CONFIG_PHYLIB && CONFIG_DM_MDIO */
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#endif /* CONFIG_DM_ETH */
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