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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2021 Ahmad Fatoum, Pengutronix
*/
#include <common.h>
#include <init.h>
#include <linux/reset.h>
#include <linux/clk.h>
#include <mfd/syscon.h>
#include <soc/starfive/sysmain.h>
#include "designware.h"
/*
* GMAC_GTXCLK
* bit name access default description
* [31] _gmac_gtxclk enable RW 0x0 "1:enable; 0:disable"
* [30] reserved - 0x0 reserved
* [29:8] reserved - 0x0 reserved
* [7:0] gmac_gtxclk ratio RW 0x4 divider value
*
* 1000M: gtxclk@125M => 500/125 = 0x4
* 100M: gtxclk@25M => 500/25 = 0x14
* 10M: gtxclk@2.5M => 500/2.5 = 0xc8
*/
#define CLKGEN_BASE 0x11800000
#define CLKGEN_GMAC_GTXCLK_OFFSET 0x1EC
#define CLKGEN_GMAC_GTXCLK_ADDR (CLKGEN_BASE + CLKGEN_GMAC_GTXCLK_OFFSET)
#define CLKGEN_125M_DIV 0x4
#define CLKGEN_25M_DIV 0x14
#define CLKGEN_2_5M_DIV 0xc8
static void dwmac_fixed_speed(int speed)
{
/* TODO: move this into clk driver */
void __iomem *addr = IOMEM(CLKGEN_GMAC_GTXCLK_ADDR);
u32 value;
value = readl(addr) & (~0x000000FF);
switch (speed) {
case SPEED_1000: value |= CLKGEN_125M_DIV; break;
case SPEED_100: value |= CLKGEN_25M_DIV; break;
case SPEED_10: value |= CLKGEN_2_5M_DIV; break;
default: return;
}
writel(value, addr);
}
static struct dw_eth_drvdata starfive_drvdata = {
.enh_desc = 1,
.fix_mac_speed = dwmac_fixed_speed,
};
static int starfive_dwc_ether_probe(struct device_d *dev)
{
struct dw_eth_dev *dwc;
struct regmap *regmap;
int ret;
struct clk_bulk_data clks[] = {
{ .id = "stmmaceth" },
{ .id = "ptp_ref" },
{ .id = "tx" },
};
regmap = syscon_regmap_lookup_by_phandle(dev->device_node, "starfive,sysmain");
if (IS_ERR(regmap)) {
dev_err(dev, "Could not get starfive,sysmain node\n");
return PTR_ERR(regmap);
}
ret = clk_bulk_get(dev, ARRAY_SIZE(clks), clks);
if (ret)
return ret;
ret = clk_bulk_enable(ARRAY_SIZE(clks), clks);
if (ret < 0)
return ret;
ret = device_reset(dev);
if (ret)
return ret;
dwc = dwc_drv_probe(dev);
if (IS_ERR(dwc))
return PTR_ERR(dwc);
if (phy_interface_mode_is_rgmii(dwc->interface)) {
regmap_update_bits(regmap, SYSMAIN_GMAC_PHY_INTF_SEL, 0x7, 0x1);
regmap_write(regmap, SYSMAIN_GMAC_GTXCLK_DLYCHAIN_SEL, 0x4);
}
return 0;
}
static struct of_device_id starfive_dwc_ether_compatible[] = {
{ .compatible = "starfive,stmmac", .data = &starfive_drvdata },
{ /* sentinel */ }
};
static struct driver_d starfive_dwc_ether_driver = {
.name = "starfive-designware_eth",
.probe = starfive_dwc_ether_probe,
.of_compatible = starfive_dwc_ether_compatible,
};
device_platform_driver(starfive_dwc_ether_driver);
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