mt7620/1, mt7530: Where are these MAC and MII registers documented?

Daniel Santos daniel at gsat.us
Fri Jun 28 14:55:40 PDT 2019


Hello,

I'm looking at the mt7620 Ethernet driver and I see a lot of magic
happening for which I cannot find documentation anywhere.  Can anybody
tell me where I can get the datasheets / programmer's guide that
document these registers please?

Examples:
I/O to 0x7830, 0x7a40 -- Entries in the WAPI table?  That seems strange.

_mt7620_mii_write(gsw, gsw->ephy_base + 1, 22, 0x10cf);  The mt7620
programming guide only documents 0-6, while the 802.3-2005 has
everything from 16-31 marked as "vendor specific".  Also, what does port
31 do?

>From the current OpenWRT head:

static void mt7620_hw_init(struct mt7620_gsw *gsw, int mdio_mode)
{
	u32 i;
	u32 val;
	u32 is_BGA = (rt_sysc_r32(0x0c) >> 16) & 1;

	rt_sysc_w32(rt_sysc_r32(SYSC_REG_CFG1) | BIT(8), SYSC_REG_CFG1);
	mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_CKGCR) & ~(0x3 << 4), GSW_REG_CKGCR);

	/* Enable MIB stats */
	mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_MIB_CNT_EN) | (1 << 1), GSW_REG_MIB_CNT_EN);

	if (mdio_mode) {
		u32 val;

		/* turn off ephy and set phy base addr to 12 */
		mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_GPC1) |
			(0x1f << 24) | (0xc << 16),
			GSW_REG_GPC1);

		/* set MT7530 central align */
		val = mt7530_mdio_r32(gsw, 0x7830);
		val &= ~BIT(0);
		val |= BIT(1);
		mt7530_mdio_w32(gsw, 0x7830, val);

		val = mt7530_mdio_r32(gsw, 0x7a40);
		val &= ~BIT(30);
		mt7530_mdio_w32(gsw, 0x7a40, val);

		mt7530_mdio_w32(gsw, 0x7a78, 0x855);
	} else {

		if (gsw->ephy_base) {
			/* set phy base addr to ephy_base */
			mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_GPC1) |
				(gsw->ephy_base << 16),
				GSW_REG_GPC1);
			fe_reset(BIT(24)); /* Resets the Ethernet PHY block. */
		}

		/* global page 4 */
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0x4000);

		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 17, 0x7444);
		if (is_BGA)
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 19, 0x0114);
		else
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 19, 0x0117);

		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 22, 0x10cf);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 25, 0x6212);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 26, 0x0777);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 29, 0x4000);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 28, 0xc077);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 24, 0x0000);

		/* global page 3 */
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0x3000);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 17, 0x4838);

		/* global page 2 */
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0x2000);
		if (is_BGA) {
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 21, 0x0515);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 22, 0x0053);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 23, 0x00bf);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 24, 0x0aaf);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 25, 0x0fad);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 26, 0x0fc1);
		} else {
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 21, 0x0517);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 22, 0x0fd2);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 23, 0x00bf);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 24, 0x0aab);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 25, 0x00ae);
			_mt7620_mii_write(gsw, gsw->ephy_base + 1, 26, 0x0fff);
		}
		/* global page 1 */
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0x1000);
		_mt7620_mii_write(gsw, gsw->ephy_base + 1, 17, 0xe7f8);

		/* turn on all PHYs */
		for (i = 0; i <= 4; i++) {
			val = _mt7620_mii_read(gsw, gsw->ephy_base + i, 0);
			val &= ~BIT(11);
			_mt7620_mii_write(gsw, gsw->ephy_base + i, 0, val);
		}
	}

	/* global page 0 */
	_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0x8000);
	_mt7620_mii_write(gsw, gsw->ephy_base + 0, 30, 0xa000);
	_mt7620_mii_write(gsw, gsw->ephy_base + 1, 30, 0xa000);
	_mt7620_mii_write(gsw, gsw->ephy_base + 2, 30, 0xa000);
	_mt7620_mii_write(gsw, gsw->ephy_base + 3, 30, 0xa000);

	_mt7620_mii_write(gsw, gsw->ephy_base + 0, 4, 0x05e1);
	_mt7620_mii_write(gsw, gsw->ephy_base + 1, 4, 0x05e1);
	_mt7620_mii_write(gsw, gsw->ephy_base + 2, 4, 0x05e1);
	_mt7620_mii_write(gsw, gsw->ephy_base + 3, 4, 0x05e1);

	/* global page 2 */
	_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0xa000);
	_mt7620_mii_write(gsw, gsw->ephy_base + 0, 16, 0x1111);
	_mt7620_mii_write(gsw, gsw->ephy_base + 1, 16, 0x1010);
	_mt7620_mii_write(gsw, gsw->ephy_base + 2, 16, 0x1515);
	_mt7620_mii_write(gsw, gsw->ephy_base + 3, 16, 0x0f0f);

	/* CPU Port6 Force Link 1G, FC ON */
	mtk_switch_w32(gsw, 0x5e33b, GSW_REG_PORT_PMCR(6));

	/* Set Port 6 as CPU Port */
	mtk_switch_w32(gsw, 0x7f7f7fe0, 0x0010);

	/* setup port 4 */
	if (gsw->port4 == PORT4_EPHY) {
		u32 val = rt_sysc_r32(SYSC_REG_CFG1);

		val |= 3 << 14;
		rt_sysc_w32(val, SYSC_REG_CFG1);
		_mt7620_mii_write(gsw, gsw->ephy_base + 4, 30, 0xa000);
		_mt7620_mii_write(gsw, gsw->ephy_base + 4, 4, 0x05e1);
		_mt7620_mii_write(gsw, gsw->ephy_base + 4, 16, 0x1313);
		pr_info("gsw: setting port4 to ephy mode\n");
	} else if (!mdio_mode) {
		u32 val = rt_sysc_r32(SYSC_REG_CFG1);

		val &= ~(3 << 14);
		rt_sysc_w32(val, SYSC_REG_CFG1);
		pr_info("gsw: setting port4 to gmac mode\n");
	}
}


Thanks,
Daniel



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