pcie-rockchip.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Rockchip AXI PCIe host controller driver
 *
 * Copyright (c) 2016 Rockchip, Inc.
 *
 * Author: Shawn Lin <shawn.lin@rock-chips.com>
 *         Wenrui Li <wenrui.li@rock-chips.com>
 *
 * Bits taken from Synopsys DesignWare Host controller driver and
 * ARM PCI Host generic driver.
 */

#include <linux/clk.h>
#include <linux/phy/phy.h>

#include "pcie-rockchip.h"

int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
{
	struct device *dev = rockchip->dev;
	struct phy *phy;
	char *name;
	u32 i;

	phy = devm_phy_get(dev, "pcie-phy");
	if (!IS_ERR(phy)) {
		rockchip->legacy_phy = true;
		rockchip->phys[0] = phy;
		dev_warn(dev, "legacy phy model is deprecated!\n");
		return 0;
	}

	if (PTR_ERR(phy) == -EPROBE_DEFER)
		return PTR_ERR(phy);

	dev_dbg(dev, "missing legacy phy; search for per-lane PHY\n");

	for (i = 0; i < MAX_LANE_NUM; i++) {
		name = kasprintf(GFP_KERNEL, "pcie-phy-%u", i);
		if (!name)
			return -ENOMEM;

		phy = devm_of_phy_get(dev, dev->of_node, name);
		kfree(name);

		if (IS_ERR(phy)) {
			if (PTR_ERR(phy) != -EPROBE_DEFER)
				dev_err(dev, "missing phy for lane %d: %ld\n",
					i, PTR_ERR(phy));
			return PTR_ERR(phy);
		}

		rockchip->phys[i] = phy;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(rockchip_pcie_get_phys);

void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip)
{
	int i;

	for (i = 0; i < MAX_LANE_NUM; i++) {
		/* inactive lanes are already powered off */
		if (rockchip->lanes_map & BIT(i))
			phy_power_off(rockchip->phys[i]);
		phy_exit(rockchip->phys[i]);
	}
}
EXPORT_SYMBOL_GPL(rockchip_pcie_deinit_phys);

int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip)
{
	struct device *dev = rockchip->dev;
	int err;

	err = clk_prepare_enable(rockchip->aclk_pcie);
	if (err) {
		dev_err(dev, "unable to enable aclk_pcie clock\n");
		return err;
	}

	err = clk_prepare_enable(rockchip->aclk_perf_pcie);
	if (err) {
		dev_err(dev, "unable to enable aclk_perf_pcie clock\n");
		goto err_aclk_perf_pcie;
	}

	err = clk_prepare_enable(rockchip->hclk_pcie);
	if (err) {
		dev_err(dev, "unable to enable hclk_pcie clock\n");
		goto err_hclk_pcie;
	}

	err = clk_prepare_enable(rockchip->clk_pcie_pm);
	if (err) {
		dev_err(dev, "unable to enable clk_pcie_pm clock\n");
		goto err_clk_pcie_pm;
	}

	return 0;

err_clk_pcie_pm:
	clk_disable_unprepare(rockchip->hclk_pcie);
err_hclk_pcie:
	clk_disable_unprepare(rockchip->aclk_perf_pcie);
err_aclk_perf_pcie:
	clk_disable_unprepare(rockchip->aclk_pcie);
	return err;
}
EXPORT_SYMBOL_GPL(rockchip_pcie_enable_clocks);

void rockchip_pcie_disable_clocks(void *data)
{
	struct rockchip_pcie *rockchip = data;

	clk_disable_unprepare(rockchip->clk_pcie_pm);
	clk_disable_unprepare(rockchip->hclk_pcie);
	clk_disable_unprepare(rockchip->aclk_perf_pcie);
	clk_disable_unprepare(rockchip->aclk_pcie);
}
EXPORT_SYMBOL_GPL(rockchip_pcie_disable_clocks);

void rockchip_pcie_cfg_configuration_accesses(
		struct rockchip_pcie *rockchip, u32 type)
{
	u32 ob_desc_0;

	/* Configuration Accesses for region 0 */
	rockchip_pcie_write(rockchip, 0x0, PCIE_RC_BAR_CONF);

	rockchip_pcie_write(rockchip,
			    (RC_REGION_0_ADDR_TRANS_L + RC_REGION_0_PASS_BITS),
			    PCIE_CORE_OB_REGION_ADDR0);
	rockchip_pcie_write(rockchip, RC_REGION_0_ADDR_TRANS_H,
			    PCIE_CORE_OB_REGION_ADDR1);
	ob_desc_0 = rockchip_pcie_read(rockchip, PCIE_CORE_OB_REGION_DESC0);
	ob_desc_0 &= ~(RC_REGION_0_TYPE_MASK);
	ob_desc_0 |= (type | (0x1 << 23));
	rockchip_pcie_write(rockchip, ob_desc_0, PCIE_CORE_OB_REGION_DESC0);
	rockchip_pcie_write(rockchip, 0x0, PCIE_CORE_OB_REGION_DESC1);
}
EXPORT_SYMBOL_GPL(rockchip_pcie_cfg_configuration_accesses);