487 lines
12 KiB
C
487 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCIe host controller driver for Kirin Phone SoCs
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*
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* Copyright (C) 2017 HiSilicon Electronics Co., Ltd.
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* https://www.huawei.com
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*
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* Author: Xiaowei Song <songxiaowei@huawei.com>
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*/
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#include <linux/compiler.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of_address.h>
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#include <linux/of_gpio.h>
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#include <linux/of_pci.h>
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#include <linux/pci.h>
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#include <linux/pci_regs.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/resource.h>
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#include <linux/types.h>
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#include "pcie-designware.h"
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#define to_kirin_pcie(x) dev_get_drvdata((x)->dev)
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#define REF_CLK_FREQ 100000000
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/* PCIe ELBI registers */
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#define SOC_PCIECTRL_CTRL0_ADDR 0x000
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#define SOC_PCIECTRL_CTRL1_ADDR 0x004
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#define SOC_PCIEPHY_CTRL2_ADDR 0x008
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#define SOC_PCIEPHY_CTRL3_ADDR 0x00c
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#define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21)
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/* info located in APB */
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#define PCIE_APP_LTSSM_ENABLE 0x01c
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#define PCIE_APB_PHY_CTRL0 0x0
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#define PCIE_APB_PHY_CTRL1 0x4
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#define PCIE_APB_PHY_STATUS0 0x400
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#define PCIE_LINKUP_ENABLE (0x8020)
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#define PCIE_LTSSM_ENABLE_BIT (0x1 << 11)
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#define PIPE_CLK_STABLE (0x1 << 19)
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#define PHY_REF_PAD_BIT (0x1 << 8)
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#define PHY_PWR_DOWN_BIT (0x1 << 22)
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#define PHY_RST_ACK_BIT (0x1 << 16)
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/* info located in sysctrl */
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#define SCTRL_PCIE_CMOS_OFFSET 0x60
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#define SCTRL_PCIE_CMOS_BIT 0x10
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#define SCTRL_PCIE_ISO_OFFSET 0x44
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#define SCTRL_PCIE_ISO_BIT 0x30
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#define SCTRL_PCIE_HPCLK_OFFSET 0x190
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#define SCTRL_PCIE_HPCLK_BIT 0x184000
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#define SCTRL_PCIE_OE_OFFSET 0x14a
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#define PCIE_DEBOUNCE_PARAM 0xF0F400
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#define PCIE_OE_BYPASS (0x3 << 28)
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/* peri_crg ctrl */
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#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
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#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
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/* Time for delay */
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#define REF_2_PERST_MIN 20000
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#define REF_2_PERST_MAX 25000
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#define PERST_2_ACCESS_MIN 10000
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#define PERST_2_ACCESS_MAX 12000
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#define LINK_WAIT_MIN 900
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#define LINK_WAIT_MAX 1000
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#define PIPE_CLK_WAIT_MIN 550
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#define PIPE_CLK_WAIT_MAX 600
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#define TIME_CMOS_MIN 100
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#define TIME_CMOS_MAX 105
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#define TIME_PHY_PD_MIN 10
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#define TIME_PHY_PD_MAX 11
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struct kirin_pcie {
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struct dw_pcie *pci;
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void __iomem *apb_base;
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void __iomem *phy_base;
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struct regmap *crgctrl;
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struct regmap *sysctrl;
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struct clk *apb_sys_clk;
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struct clk *apb_phy_clk;
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struct clk *phy_ref_clk;
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struct clk *pcie_aclk;
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struct clk *pcie_aux_clk;
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int gpio_id_reset;
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};
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/* Registers in PCIeCTRL */
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static inline void kirin_apb_ctrl_writel(struct kirin_pcie *kirin_pcie,
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u32 val, u32 reg)
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{
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writel(val, kirin_pcie->apb_base + reg);
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}
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static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 reg)
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{
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return readl(kirin_pcie->apb_base + reg);
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}
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/* Registers in PCIePHY */
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static inline void kirin_apb_phy_writel(struct kirin_pcie *kirin_pcie,
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u32 val, u32 reg)
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{
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writel(val, kirin_pcie->phy_base + reg);
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}
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static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 reg)
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{
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return readl(kirin_pcie->phy_base + reg);
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}
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static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie,
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struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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kirin_pcie->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref");
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if (IS_ERR(kirin_pcie->phy_ref_clk))
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return PTR_ERR(kirin_pcie->phy_ref_clk);
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kirin_pcie->pcie_aux_clk = devm_clk_get(dev, "pcie_aux");
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if (IS_ERR(kirin_pcie->pcie_aux_clk))
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return PTR_ERR(kirin_pcie->pcie_aux_clk);
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kirin_pcie->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy");
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if (IS_ERR(kirin_pcie->apb_phy_clk))
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return PTR_ERR(kirin_pcie->apb_phy_clk);
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kirin_pcie->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys");
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if (IS_ERR(kirin_pcie->apb_sys_clk))
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return PTR_ERR(kirin_pcie->apb_sys_clk);
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kirin_pcie->pcie_aclk = devm_clk_get(dev, "pcie_aclk");
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if (IS_ERR(kirin_pcie->pcie_aclk))
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return PTR_ERR(kirin_pcie->pcie_aclk);
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return 0;
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}
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static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
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struct platform_device *pdev)
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{
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kirin_pcie->apb_base =
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devm_platform_ioremap_resource_byname(pdev, "apb");
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if (IS_ERR(kirin_pcie->apb_base))
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return PTR_ERR(kirin_pcie->apb_base);
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kirin_pcie->phy_base =
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devm_platform_ioremap_resource_byname(pdev, "phy");
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if (IS_ERR(kirin_pcie->phy_base))
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return PTR_ERR(kirin_pcie->phy_base);
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kirin_pcie->crgctrl =
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syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl");
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if (IS_ERR(kirin_pcie->crgctrl))
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return PTR_ERR(kirin_pcie->crgctrl);
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kirin_pcie->sysctrl =
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syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl");
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if (IS_ERR(kirin_pcie->sysctrl))
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return PTR_ERR(kirin_pcie->sysctrl);
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return 0;
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}
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static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie)
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{
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struct device *dev = kirin_pcie->pci->dev;
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u32 reg_val;
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reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1);
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reg_val &= ~PHY_REF_PAD_BIT;
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kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1);
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reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0);
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reg_val &= ~PHY_PWR_DOWN_BIT;
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kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0);
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usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX);
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reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1);
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reg_val &= ~PHY_RST_ACK_BIT;
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kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1);
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usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX);
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reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_STATUS0);
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if (reg_val & PIPE_CLK_STABLE) {
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dev_err(dev, "PIPE clk is not stable\n");
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return -EINVAL;
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}
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return 0;
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}
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static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie)
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{
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u32 val;
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regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val);
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val |= PCIE_DEBOUNCE_PARAM;
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val &= ~PCIE_OE_BYPASS;
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regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
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}
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static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable)
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{
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int ret = 0;
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if (!enable)
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goto close_clk;
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ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ);
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if (ret)
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return ret;
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ret = clk_prepare_enable(kirin_pcie->phy_ref_clk);
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if (ret)
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return ret;
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ret = clk_prepare_enable(kirin_pcie->apb_sys_clk);
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if (ret)
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goto apb_sys_fail;
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ret = clk_prepare_enable(kirin_pcie->apb_phy_clk);
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if (ret)
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goto apb_phy_fail;
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ret = clk_prepare_enable(kirin_pcie->pcie_aclk);
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if (ret)
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goto aclk_fail;
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ret = clk_prepare_enable(kirin_pcie->pcie_aux_clk);
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if (ret)
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goto aux_clk_fail;
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return 0;
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close_clk:
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clk_disable_unprepare(kirin_pcie->pcie_aux_clk);
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aux_clk_fail:
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clk_disable_unprepare(kirin_pcie->pcie_aclk);
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aclk_fail:
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clk_disable_unprepare(kirin_pcie->apb_phy_clk);
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apb_phy_fail:
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clk_disable_unprepare(kirin_pcie->apb_sys_clk);
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apb_sys_fail:
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clk_disable_unprepare(kirin_pcie->phy_ref_clk);
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return ret;
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}
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static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie)
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{
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int ret;
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/* Power supply for Host */
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regmap_write(kirin_pcie->sysctrl,
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SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
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usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
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kirin_pcie_oe_enable(kirin_pcie);
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ret = kirin_pcie_clk_ctrl(kirin_pcie, true);
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if (ret)
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return ret;
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/* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
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regmap_write(kirin_pcie->sysctrl,
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SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
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regmap_write(kirin_pcie->crgctrl,
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CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT);
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regmap_write(kirin_pcie->sysctrl,
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SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT);
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ret = kirin_pcie_phy_init(kirin_pcie);
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if (ret)
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goto close_clk;
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/* perst assert Endpoint */
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if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) {
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usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX);
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ret = gpio_direction_output(kirin_pcie->gpio_id_reset, 1);
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if (ret)
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goto close_clk;
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usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX);
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return 0;
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}
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close_clk:
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kirin_pcie_clk_ctrl(kirin_pcie, false);
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return ret;
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}
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static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie,
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bool on)
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{
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u32 val;
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val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL0_ADDR);
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if (on)
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val = val | PCIE_ELBI_SLV_DBI_ENABLE;
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else
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val = val & ~PCIE_ELBI_SLV_DBI_ENABLE;
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kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL0_ADDR);
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}
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static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie,
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bool on)
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{
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u32 val;
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val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL1_ADDR);
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if (on)
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val = val | PCIE_ELBI_SLV_DBI_ENABLE;
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else
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val = val & ~PCIE_ELBI_SLV_DBI_ENABLE;
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kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL1_ADDR);
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}
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static int kirin_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
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if (PCI_SLOT(devfn)) {
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*val = ~0;
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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*val = dw_pcie_read_dbi(pci, where, size);
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return PCIBIOS_SUCCESSFUL;
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}
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static int kirin_pcie_wr_own_conf(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
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if (PCI_SLOT(devfn))
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return PCIBIOS_DEVICE_NOT_FOUND;
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dw_pcie_write_dbi(pci, where, size, val);
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return PCIBIOS_SUCCESSFUL;
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}
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static struct pci_ops kirin_pci_ops = {
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.read = kirin_pcie_rd_own_conf,
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.write = kirin_pcie_wr_own_conf,
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};
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static u32 kirin_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
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u32 reg, size_t size)
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{
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struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
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u32 ret;
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kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true);
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dw_pcie_read(base + reg, size, &ret);
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kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false);
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return ret;
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}
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static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
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u32 reg, size_t size, u32 val)
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{
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struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
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kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true);
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dw_pcie_write(base + reg, size, val);
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kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false);
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}
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static int kirin_pcie_link_up(struct dw_pcie *pci)
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{
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struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
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u32 val = kirin_apb_ctrl_readl(kirin_pcie, PCIE_APB_PHY_STATUS0);
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if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE)
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return 1;
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return 0;
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}
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static int kirin_pcie_start_link(struct dw_pcie *pci)
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{
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struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
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/* assert LTSSM enable */
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kirin_apb_ctrl_writel(kirin_pcie, PCIE_LTSSM_ENABLE_BIT,
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PCIE_APP_LTSSM_ENABLE);
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return 0;
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}
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static int kirin_pcie_host_init(struct pcie_port *pp)
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{
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pp->bridge->ops = &kirin_pci_ops;
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return 0;
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}
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static const struct dw_pcie_ops kirin_dw_pcie_ops = {
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.read_dbi = kirin_pcie_read_dbi,
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.write_dbi = kirin_pcie_write_dbi,
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.link_up = kirin_pcie_link_up,
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.start_link = kirin_pcie_start_link,
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};
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static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
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.host_init = kirin_pcie_host_init,
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};
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static int kirin_pcie_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct kirin_pcie *kirin_pcie;
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struct dw_pcie *pci;
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int ret;
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if (!dev->of_node) {
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dev_err(dev, "NULL node\n");
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return -EINVAL;
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}
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kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL);
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if (!kirin_pcie)
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return -ENOMEM;
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pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
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if (!pci)
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return -ENOMEM;
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pci->dev = dev;
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pci->ops = &kirin_dw_pcie_ops;
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pci->pp.ops = &kirin_pcie_host_ops;
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kirin_pcie->pci = pci;
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ret = kirin_pcie_get_clk(kirin_pcie, pdev);
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if (ret)
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return ret;
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ret = kirin_pcie_get_resource(kirin_pcie, pdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
kirin_pcie->gpio_id_reset = of_get_named_gpio(dev->of_node,
|
|
"reset-gpios", 0);
|
|
if (kirin_pcie->gpio_id_reset == -EPROBE_DEFER) {
|
|
return -EPROBE_DEFER;
|
|
} else if (!gpio_is_valid(kirin_pcie->gpio_id_reset)) {
|
|
dev_err(dev, "unable to get a valid gpio pin\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = kirin_pcie_power_on(kirin_pcie);
|
|
if (ret)
|
|
return ret;
|
|
|
|
platform_set_drvdata(pdev, kirin_pcie);
|
|
|
|
return dw_pcie_host_init(&pci->pp);
|
|
}
|
|
|
|
static const struct of_device_id kirin_pcie_match[] = {
|
|
{ .compatible = "hisilicon,kirin960-pcie" },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver kirin_pcie_driver = {
|
|
.probe = kirin_pcie_probe,
|
|
.driver = {
|
|
.name = "kirin-pcie",
|
|
.of_match_table = kirin_pcie_match,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
};
|
|
builtin_platform_driver(kirin_pcie_driver);
|