path: root/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  This contains the functions to handle the platform driver.

  Copyright (C) 2007-2011  STMicroelectronics Ltd


  Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*******************************************************************************/

#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/of_mdio.h>

#include "stmmac.h"
#include "stmmac_platform.h"

#ifdef CONFIG_OF

/**
 * dwmac1000_validate_mcast_bins - validates the number of Multicast filter bins
 * @dev: struct device of the platform device
 * @mcast_bins: Multicast filtering bins
 * Description:
 * this function validates the number of Multicast filtering bins specified
 * by the configuration through the device tree. The Synopsys GMAC supports
 * 64 bins, 128 bins, or 256 bins. "bins" refer to the division of CRC
 * number space. 64 bins correspond to 6 bits of the CRC, 128 corresponds
 * to 7 bits, and 256 refers to 8 bits of the CRC. Any other setting is
 * invalid and will cause the filtering algorithm to use Multicast
 * promiscuous mode.
 */
static int dwmac1000_validate_mcast_bins(struct device *dev, int mcast_bins)
{
	int x = mcast_bins;

	switch (x) {
	case HASH_TABLE_SIZE:
	case 128:
	case 256:
		break;
	default:
		x = 0;
		dev_info(dev, "Hash table entries set to unexpected value %d\n",
			 mcast_bins);
		break;
	}
	return x;
}

/**
 * dwmac1000_validate_ucast_entries - validate the Unicast address entries
 * @dev: struct device of the platform device
 * @ucast_entries: number of Unicast address entries
 * Description:
 * This function validates the number of Unicast address entries supported
 * by a particular Synopsys 10/100/1000 controller. The Synopsys controller
 * supports 1..32, 64, or 128 Unicast filter entries for its Unicast filter
 * logic. This function validates a valid, supported configuration is
 * selected, and defaults to 1 Unicast address if an unsupported
 * configuration is selected.
 */
static int dwmac1000_validate_ucast_entries(struct device *dev,
					    int ucast_entries)
{
	int x = ucast_entries;

	switch (x) {
	case 1 ... 32:
	case 64:
	case 128:
		break;
	default:
		x = 1;
		dev_info(dev, "Unicast table entries set to unexpected value %d\n",
			 ucast_entries);
		break;
	}
	return x;
}

/**
 * stmmac_axi_setup - parse DT parameters for programming the AXI register
 * @pdev: platform device
 * Description:
 * if required, from device-tree the AXI internal register can be tuned
 * by using platform parameters.
 */
static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
{
	struct device_node *np;
	struct stmmac_axi *axi;
	u32 axi_blen[AXI_BLEN];

	np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
	if (!np)
		return NULL;

	axi = devm_kzalloc(&pdev->dev, sizeof(*axi), GFP_KERNEL);
	if (!axi) {
		of_node_put(np);
		return ERR_PTR(-ENOMEM);
	}

	axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
	axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
	axi->axi_fb = of_property_read_bool(np, "snps,fb");

	if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt))
		axi->axi_wr_osr_lmt = 1;
	if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt))
		axi->axi_rd_osr_lmt = 1;
	of_property_read_u32_array(np, "snps,blen", axi_blen, AXI_BLEN);
	stmmac_axi_blen_to_mask(&axi->axi_blen_regval, axi_blen, AXI_BLEN);
	of_node_put(np);

	return axi;
}

/**
 * stmmac_mtl_setup - parse DT parameters for multiple queues configuration
 * @pdev: platform device
 * @plat: enet data
 */
static int stmmac_mtl_setup(struct platform_device *pdev,
			    struct plat_stmmacenet_data *plat)
{
	struct device_node *q_node;
	struct device_node *rx_node;
	struct device_node *tx_node;
	u8 queue = 0;
	int ret = 0;
	u32 value;

	/* First Queue must always be in DCB mode. As MTL_QUEUE_DCB = 1 we need
	 * to always set this, otherwise Queue will be classified as AVB
	 * (because MTL_QUEUE_AVB = 0).
	 */
	plat->rx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;
	plat->tx_queues_cfg[0].mode_to_use = MTL_QUEUE_DCB;

	rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
	if (!rx_node)
		return ret;

	tx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-tx-config", 0);
	if (!tx_node) {
		of_node_put(rx_node);
		return ret;
	}

	/* Processing RX queues common config */
	if (!of_property_read_u32(rx_node, "snps,rx-queues-to-use", &value)) {
		if (value > U8_MAX)
			value = U8_MAX;
		plat->rx_queues_to_use = value;