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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-11-25 GuEe-GUI first version
*/
#define GEM_MDIO_IDLE_RETRIES 100000
#define GEM_MDIO_POLL_US 10
#define GEM_MDIO_FIXED_TURNAROUND_US 100
static rt_bool_t gem_mdio_wait_idle(struct macb_eth *eth, int retries)
{
while (retries-- > 0)
{
rt_uint32_t nsr = macb_readl(eth, GEM_NSR);
/*
* GEM queue-0 may not expose a readable NSR @ 0x8 (reads 0xffffffff).
* Linux/U-Boot treat the idle bit as set; use a fixed turnaround.
*/
if (nsr == 0xffffffff)
{
rt_hw_us_delay(GEM_MDIO_FIXED_TURNAROUND_US);
return RT_TRUE;
}
if (nsr & GEM_NSR_IDLE)
{
return RT_TRUE;
}
rt_hw_us_delay(GEM_MDIO_POLL_US);
}
return RT_FALSE;
}
static rt_err_t gem_mdio_frame(struct macb_eth *eth, rt_uint32_t frame)
{
if (!gem_mdio_wait_idle(eth, GEM_MDIO_IDLE_RETRIES))
{
return -RT_ETIMEOUT;
}
macb_writel(eth, GEM_MAN, frame);
if (!eth->native_io)
{
macb_mmio_posted_barrier(eth);
}
if (!gem_mdio_wait_idle(eth, GEM_MDIO_IDLE_RETRIES))
{
if (!eth->native_io)
{
rt_hw_us_delay(GEM_MDIO_FIXED_TURNAROUND_US);
return RT_EOK;
}
return -RT_ETIMEOUT;
}
return RT_EOK;
}
static rt_bool_t gem_mdio_data_invalid(struct macb_eth *eth, rt_uint32_t data)
{
return data == 0xffff && !eth->native_io;
}
static rt_uint32_t gem_ncfgr_mdc_div(rt_ubase_t pclk_hz)
{
if (pclk_hz <= 20000000)
{
return GEM_CLK_DIV8 << GEM_NCFGR_CLK_SHIFT;
}
else if (pclk_hz <= 40000000)
{
return GEM_CLK_DIV16 << GEM_NCFGR_CLK_SHIFT;
}
else if (pclk_hz <= 80000000)
{
return GEM_CLK_DIV32 << GEM_NCFGR_CLK_SHIFT;
}
else if (pclk_hz <= 120000000)
{
return GEM_CLK_DIV48 << GEM_NCFGR_CLK_SHIFT;
}
else if (pclk_hz <= 160000000)
{
return GEM_CLK_DIV64 << GEM_NCFGR_CLK_SHIFT;
}
else if (pclk_hz <= 240000000)
{
return GEM_CLK_DIV96 << GEM_NCFGR_CLK_SHIFT;
}
else if (pclk_hz <= 320000000)
{
return GEM_CLK_DIV128 << GEM_NCFGR_CLK_SHIFT;
}
return GEM_CLK_DIV224 << GEM_NCFGR_CLK_SHIFT;
}
static rt_uint32_t macb_gem_dbw(struct macb_eth *eth)
{
rt_uint32_t dcfg1, dbw;
dcfg1 = macb_readl(eth, GEM_DCFG1);
dbw = (dcfg1 >> 25) & 0x7U;
switch (dbw)
{
case 4:
return GEM_DBW128 << GEM_NCFGR_DBW_SHIFT;
case 2:
return GEM_DBW64 << GEM_NCFGR_DBW_SHIFT;
default:
return GEM_DBW32 << GEM_NCFGR_DBW_SHIFT;
}
}
static int gem_mdio_read(struct mii_bus *bus, int addr, int devad, int reg)
{
rt_err_t err;
rt_uint32_t data, frame;
struct macb_eth *eth = bus->priv;
rt_mutex_take(ð->mdio_lock, RT_WAITING_FOREVER);
frame = GEM_MAN_BF(SOF, GEM_MAN_SOF) | GEM_MAN_BF(RW, GEM_MAN_READ) |
GEM_MAN_BF(PHYA, addr) | GEM_MAN_BF(REGA, reg) |
GEM_MAN_BF(CODE, GEM_MAN_CODE);
err = gem_mdio_frame(eth, frame);
if (err)
{
LOG_W("MDIO read timeout addr=%d reg=%d nsr=0x%x ncr=0x%x",
addr, reg, macb_readl(eth, GEM_NSR), macb_readl(eth, GEM_NCR));
rt_mutex_release(ð->mdio_lock);
return -RT_EIO;
}
data = macb_readl(eth, GEM_MAN) & 0xffff;
if (gem_mdio_data_invalid(eth, data))
{
LOG_W("MDIO read invalid data addr=%d reg=%d man=0x%x",
addr, reg, macb_readl(eth, GEM_MAN));
rt_mutex_release(ð->mdio_lock);
return -RT_EIO;
}
rt_mutex_release(ð->mdio_lock);
return (int)data;
}
static int gem_mdio_write(struct mii_bus *bus, int addr, int devad, int reg, rt_uint16_t val)
{
rt_err_t err;
rt_uint32_t frame;
struct macb_eth *eth = bus->priv;
rt_mutex_take(ð->mdio_lock, RT_WAITING_FOREVER);
frame = GEM_MAN_BF(SOF, GEM_MAN_SOF) | GEM_MAN_BF(RW, GEM_MAN_WRITE) |
GEM_MAN_BF(PHYA, addr) | GEM_MAN_BF(REGA, reg) |
GEM_MAN_BF(CODE, GEM_MAN_CODE) | GEM_MAN_BF(DATA, val);
err = gem_mdio_frame(eth, frame);
rt_mutex_release(ð->mdio_lock);
return err ? -RT_EIO : 0;
}
static rt_err_t macb_adjust_link(struct macb_eth *eth)
{
rt_uint32_t ncfgr;
struct rt_phy_device *phy = eth->phy;
if (!phy || !phy->link)
{
return -RT_ERROR;
}
/* Some platforms return unreadable NCFGR; keep a software shadow. */
ncfgr = eth->ncfgr_shadow;
ncfgr &= ~(GEM_NCFGR_SPD | GEM_NCFGR_FD | GEM_NCFGR_GBE |
(3u << GEM_NCFGR_DBW_SHIFT));
ncfgr |= macb_gem_dbw(eth);
if (phy->duplex == DUPLEX_FULL)
{
ncfgr |= GEM_NCFGR_FD;
}
if (phy->speed == SPEED_1000)
{
ncfgr |= GEM_NCFGR_GBE;
}
else if (phy->speed == SPEED_100)
{
ncfgr |= GEM_NCFGR_SPD;
}
eth->ncfgr_shadow = ncfgr;
macb_writel(eth, GEM_NCFGR, ncfgr);
if (!eth->native_io)
{
macb_mmio_posted_barrier(eth);
}
macb_set_tx_clk(eth, phy->speed);
if (eth->mac_started)
{
macb_gem_write_traffic_ier(eth);
}
return RT_EOK;
}
static int macb_mdio_bus_reset(struct mii_bus *bus)
{
struct macb_eth *eth = bus->priv;
macb_phy_reset(eth);
return 0;
}
static rt_err_t macb_mii_register(struct macb_eth *eth)
{
rt_err_t err;
eth->mii = rt_mdio_alloc();
if (!eth->mii)
{
return -RT_ENOMEM;
}
/* Enable MDIO management port (Linux macb_mii_init) */
eth->ncr_shadow |= GEM_NCR_MPE;
if (!eth->native_io)
{
macb_ncr_posted_write(eth, eth->ncr_shadow);
}
else
{
macb_writel(eth, GEM_NCR, eth->ncr_shadow);
}
eth->mii->priv = eth;
eth->mii->read = gem_mdio_read;
eth->mii->write = gem_mdio_write;
eth->mii->reset = macb_mdio_bus_reset;
rt_snprintf(eth->mii->name, RT_NAME_MAX, "mii%p", eth);
if ((err = rt_mdio_register(eth->mii)))
{
rt_free(eth->mii);
eth->mii = RT_NULL;
return err;
}
if (eth->mii->reset)
{
eth->mii->reset(eth->mii);
}
return RT_EOK;
}
static void macb_mii_unregister(struct macb_eth *eth)
{
if (eth->mii)
{
rt_mdio_unregister(eth->mii);
rt_free(eth->mii);
eth->mii = RT_NULL;
}
}
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