506 lines
12 KiB
C
506 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCIe host controller driver for Axis ARTPEC-6 SoC
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*
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* Author: Niklas Cassel <niklas.cassel@axis.com>
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*
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* Based on work done by Phil Edworthy <phil@edworthys.org>
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*/
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/of_device.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/resource.h>
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#include <linux/signal.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include "pcie-designware.h"
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#define to_artpec6_pcie(x) dev_get_drvdata((x)->dev)
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enum artpec_pcie_variants {
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ARTPEC6,
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ARTPEC7,
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};
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struct artpec6_pcie {
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struct dw_pcie *pci;
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struct regmap *regmap; /* DT axis,syscon-pcie */
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void __iomem *phy_base; /* DT phy */
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enum artpec_pcie_variants variant;
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enum dw_pcie_device_mode mode;
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};
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struct artpec_pcie_of_data {
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enum artpec_pcie_variants variant;
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enum dw_pcie_device_mode mode;
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};
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static const struct of_device_id artpec6_pcie_of_match[];
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/* ARTPEC-6 specific registers */
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#define PCIECFG 0x18
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#define PCIECFG_DBG_OEN BIT(24)
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#define PCIECFG_CORE_RESET_REQ BIT(21)
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#define PCIECFG_LTSSM_ENABLE BIT(20)
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#define PCIECFG_DEVICE_TYPE_MASK GENMASK(19, 16)
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#define PCIECFG_CLKREQ_B BIT(11)
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#define PCIECFG_REFCLK_ENABLE BIT(10)
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#define PCIECFG_PLL_ENABLE BIT(9)
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#define PCIECFG_PCLK_ENABLE BIT(8)
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#define PCIECFG_RISRCREN BIT(4)
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#define PCIECFG_MODE_TX_DRV_EN BIT(3)
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#define PCIECFG_CISRREN BIT(2)
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#define PCIECFG_MACRO_ENABLE BIT(0)
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/* ARTPEC-7 specific fields */
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#define PCIECFG_REFCLKSEL BIT(23)
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#define PCIECFG_NOC_RESET BIT(3)
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#define PCIESTAT 0x1c
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/* ARTPEC-7 specific fields */
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#define PCIESTAT_EXTREFCLK BIT(3)
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#define NOCCFG 0x40
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#define NOCCFG_ENABLE_CLK_PCIE BIT(4)
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#define NOCCFG_POWER_PCIE_IDLEACK BIT(3)
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#define NOCCFG_POWER_PCIE_IDLE BIT(2)
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#define NOCCFG_POWER_PCIE_IDLEREQ BIT(1)
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#define PHY_STATUS 0x118
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#define PHY_COSPLLLOCK BIT(0)
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#define PHY_TX_ASIC_OUT 0x4040
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#define PHY_TX_ASIC_OUT_TX_ACK BIT(0)
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#define PHY_RX_ASIC_OUT 0x405c
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#define PHY_RX_ASIC_OUT_ACK BIT(0)
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static u32 artpec6_pcie_readl(struct artpec6_pcie *artpec6_pcie, u32 offset)
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{
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u32 val;
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regmap_read(artpec6_pcie->regmap, offset, &val);
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return val;
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}
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static void artpec6_pcie_writel(struct artpec6_pcie *artpec6_pcie, u32 offset, u32 val)
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{
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regmap_write(artpec6_pcie->regmap, offset, val);
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}
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static u64 artpec6_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
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{
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struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
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struct pcie_port *pp = &pci->pp;
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struct dw_pcie_ep *ep = &pci->ep;
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switch (artpec6_pcie->mode) {
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case DW_PCIE_RC_TYPE:
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return pci_addr - pp->cfg0_base;
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case DW_PCIE_EP_TYPE:
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return pci_addr - ep->phys_base;
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default:
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dev_err(pci->dev, "UNKNOWN device type\n");
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}
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return pci_addr;
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}
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static int artpec6_pcie_establish_link(struct dw_pcie *pci)
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{
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struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
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u32 val;
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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val |= PCIECFG_LTSSM_ENABLE;
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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return 0;
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}
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static void artpec6_pcie_stop_link(struct dw_pcie *pci)
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{
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struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
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u32 val;
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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val &= ~PCIECFG_LTSSM_ENABLE;
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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}
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static const struct dw_pcie_ops dw_pcie_ops = {
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.cpu_addr_fixup = artpec6_pcie_cpu_addr_fixup,
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.start_link = artpec6_pcie_establish_link,
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.stop_link = artpec6_pcie_stop_link,
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};
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static void artpec6_pcie_wait_for_phy_a6(struct artpec6_pcie *artpec6_pcie)
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{
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struct dw_pcie *pci = artpec6_pcie->pci;
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struct device *dev = pci->dev;
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u32 val;
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unsigned int retries;
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retries = 50;
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do {
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usleep_range(1000, 2000);
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val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
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retries--;
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} while (retries &&
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(val & (NOCCFG_POWER_PCIE_IDLEACK | NOCCFG_POWER_PCIE_IDLE)));
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if (!retries)
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dev_err(dev, "PCIe clock manager did not leave idle state\n");
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retries = 50;
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do {
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usleep_range(1000, 2000);
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val = readl(artpec6_pcie->phy_base + PHY_STATUS);
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retries--;
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} while (retries && !(val & PHY_COSPLLLOCK));
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if (!retries)
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dev_err(dev, "PHY PLL did not lock\n");
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}
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static void artpec6_pcie_wait_for_phy_a7(struct artpec6_pcie *artpec6_pcie)
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{
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struct dw_pcie *pci = artpec6_pcie->pci;
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struct device *dev = pci->dev;
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u32 val;
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u16 phy_status_tx, phy_status_rx;
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unsigned int retries;
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retries = 50;
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do {
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usleep_range(1000, 2000);
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val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
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retries--;
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} while (retries &&
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(val & (NOCCFG_POWER_PCIE_IDLEACK | NOCCFG_POWER_PCIE_IDLE)));
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if (!retries)
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dev_err(dev, "PCIe clock manager did not leave idle state\n");
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retries = 50;
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do {
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usleep_range(1000, 2000);
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phy_status_tx = readw(artpec6_pcie->phy_base + PHY_TX_ASIC_OUT);
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phy_status_rx = readw(artpec6_pcie->phy_base + PHY_RX_ASIC_OUT);
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retries--;
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} while (retries && ((phy_status_tx & PHY_TX_ASIC_OUT_TX_ACK) ||
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(phy_status_rx & PHY_RX_ASIC_OUT_ACK)));
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if (!retries)
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dev_err(dev, "PHY did not enter Pn state\n");
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}
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static void artpec6_pcie_wait_for_phy(struct artpec6_pcie *artpec6_pcie)
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{
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switch (artpec6_pcie->variant) {
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case ARTPEC6:
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artpec6_pcie_wait_for_phy_a6(artpec6_pcie);
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break;
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case ARTPEC7:
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artpec6_pcie_wait_for_phy_a7(artpec6_pcie);
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break;
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}
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}
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static void artpec6_pcie_init_phy_a6(struct artpec6_pcie *artpec6_pcie)
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{
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u32 val;
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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val |= PCIECFG_RISRCREN | /* Receiver term. 50 Ohm */
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PCIECFG_MODE_TX_DRV_EN |
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PCIECFG_CISRREN | /* Reference clock term. 100 Ohm */
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PCIECFG_MACRO_ENABLE;
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val |= PCIECFG_REFCLK_ENABLE;
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val &= ~PCIECFG_DBG_OEN;
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val &= ~PCIECFG_CLKREQ_B;
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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usleep_range(5000, 6000);
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val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
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val |= NOCCFG_ENABLE_CLK_PCIE;
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artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
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usleep_range(20, 30);
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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val |= PCIECFG_PCLK_ENABLE | PCIECFG_PLL_ENABLE;
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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usleep_range(6000, 7000);
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val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
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val &= ~NOCCFG_POWER_PCIE_IDLEREQ;
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artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
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}
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static void artpec6_pcie_init_phy_a7(struct artpec6_pcie *artpec6_pcie)
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{
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struct dw_pcie *pci = artpec6_pcie->pci;
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u32 val;
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bool extrefclk;
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/* Check if external reference clock is connected */
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val = artpec6_pcie_readl(artpec6_pcie, PCIESTAT);
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extrefclk = !!(val & PCIESTAT_EXTREFCLK);
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dev_dbg(pci->dev, "Using reference clock: %s\n",
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extrefclk ? "external" : "internal");
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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val |= PCIECFG_RISRCREN | /* Receiver term. 50 Ohm */
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PCIECFG_PCLK_ENABLE;
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if (extrefclk)
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val |= PCIECFG_REFCLKSEL;
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else
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val &= ~PCIECFG_REFCLKSEL;
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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usleep_range(10, 20);
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val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
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val |= NOCCFG_ENABLE_CLK_PCIE;
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artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
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usleep_range(20, 30);
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val = artpec6_pcie_readl(artpec6_pcie, NOCCFG);
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val &= ~NOCCFG_POWER_PCIE_IDLEREQ;
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artpec6_pcie_writel(artpec6_pcie, NOCCFG, val);
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}
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static void artpec6_pcie_init_phy(struct artpec6_pcie *artpec6_pcie)
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{
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switch (artpec6_pcie->variant) {
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case ARTPEC6:
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artpec6_pcie_init_phy_a6(artpec6_pcie);
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break;
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case ARTPEC7:
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artpec6_pcie_init_phy_a7(artpec6_pcie);
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break;
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}
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}
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static void artpec6_pcie_assert_core_reset(struct artpec6_pcie *artpec6_pcie)
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{
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u32 val;
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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switch (artpec6_pcie->variant) {
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case ARTPEC6:
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val |= PCIECFG_CORE_RESET_REQ;
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break;
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case ARTPEC7:
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val &= ~PCIECFG_NOC_RESET;
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break;
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}
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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}
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static void artpec6_pcie_deassert_core_reset(struct artpec6_pcie *artpec6_pcie)
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{
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u32 val;
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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switch (artpec6_pcie->variant) {
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case ARTPEC6:
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val &= ~PCIECFG_CORE_RESET_REQ;
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break;
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case ARTPEC7:
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val |= PCIECFG_NOC_RESET;
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break;
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}
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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usleep_range(100, 200);
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}
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static int artpec6_pcie_host_init(struct pcie_port *pp)
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{
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struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
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struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
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if (artpec6_pcie->variant == ARTPEC7) {
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pci->n_fts[0] = 180;
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pci->n_fts[1] = 180;
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}
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artpec6_pcie_assert_core_reset(artpec6_pcie);
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artpec6_pcie_init_phy(artpec6_pcie);
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artpec6_pcie_deassert_core_reset(artpec6_pcie);
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artpec6_pcie_wait_for_phy(artpec6_pcie);
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return 0;
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}
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static const struct dw_pcie_host_ops artpec6_pcie_host_ops = {
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.host_init = artpec6_pcie_host_init,
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};
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static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep)
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{
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struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
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struct artpec6_pcie *artpec6_pcie = to_artpec6_pcie(pci);
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enum pci_barno bar;
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artpec6_pcie_assert_core_reset(artpec6_pcie);
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artpec6_pcie_init_phy(artpec6_pcie);
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artpec6_pcie_deassert_core_reset(artpec6_pcie);
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artpec6_pcie_wait_for_phy(artpec6_pcie);
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for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
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dw_pcie_ep_reset_bar(pci, bar);
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}
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static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
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enum pci_epc_irq_type type, u16 interrupt_num)
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{
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struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
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switch (type) {
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case PCI_EPC_IRQ_LEGACY:
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dev_err(pci->dev, "EP cannot trigger legacy IRQs\n");
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return -EINVAL;
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case PCI_EPC_IRQ_MSI:
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return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
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default:
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dev_err(pci->dev, "UNKNOWN IRQ type\n");
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}
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return 0;
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}
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static const struct dw_pcie_ep_ops pcie_ep_ops = {
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.ep_init = artpec6_pcie_ep_init,
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.raise_irq = artpec6_pcie_raise_irq,
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};
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static int artpec6_pcie_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct dw_pcie *pci;
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struct artpec6_pcie *artpec6_pcie;
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int ret;
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const struct of_device_id *match;
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const struct artpec_pcie_of_data *data;
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enum artpec_pcie_variants variant;
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enum dw_pcie_device_mode mode;
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match = of_match_device(artpec6_pcie_of_match, dev);
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if (!match)
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return -EINVAL;
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data = (struct artpec_pcie_of_data *)match->data;
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variant = (enum artpec_pcie_variants)data->variant;
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mode = (enum dw_pcie_device_mode)data->mode;
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artpec6_pcie = devm_kzalloc(dev, sizeof(*artpec6_pcie), GFP_KERNEL);
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if (!artpec6_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 = &dw_pcie_ops;
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artpec6_pcie->pci = pci;
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artpec6_pcie->variant = variant;
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artpec6_pcie->mode = mode;
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artpec6_pcie->phy_base =
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devm_platform_ioremap_resource_byname(pdev, "phy");
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if (IS_ERR(artpec6_pcie->phy_base))
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return PTR_ERR(artpec6_pcie->phy_base);
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artpec6_pcie->regmap =
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syscon_regmap_lookup_by_phandle(dev->of_node,
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"axis,syscon-pcie");
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if (IS_ERR(artpec6_pcie->regmap))
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return PTR_ERR(artpec6_pcie->regmap);
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platform_set_drvdata(pdev, artpec6_pcie);
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switch (artpec6_pcie->mode) {
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case DW_PCIE_RC_TYPE:
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if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_HOST))
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return -ENODEV;
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pci->pp.ops = &artpec6_pcie_host_ops;
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ret = dw_pcie_host_init(&pci->pp);
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if (ret < 0)
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return ret;
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break;
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case DW_PCIE_EP_TYPE: {
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u32 val;
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if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_EP))
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return -ENODEV;
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val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
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val &= ~PCIECFG_DEVICE_TYPE_MASK;
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artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
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pci->ep.ops = &pcie_ep_ops;
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return dw_pcie_ep_init(&pci->ep);
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break;
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}
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default:
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dev_err(dev, "INVALID device type %d\n", artpec6_pcie->mode);
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}
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return 0;
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}
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static const struct artpec_pcie_of_data artpec6_pcie_rc_of_data = {
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.variant = ARTPEC6,
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.mode = DW_PCIE_RC_TYPE,
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};
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static const struct artpec_pcie_of_data artpec6_pcie_ep_of_data = {
|
|
.variant = ARTPEC6,
|
|
.mode = DW_PCIE_EP_TYPE,
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|
};
|
|
|
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static const struct artpec_pcie_of_data artpec7_pcie_rc_of_data = {
|
|
.variant = ARTPEC7,
|
|
.mode = DW_PCIE_RC_TYPE,
|
|
};
|
|
|
|
static const struct artpec_pcie_of_data artpec7_pcie_ep_of_data = {
|
|
.variant = ARTPEC7,
|
|
.mode = DW_PCIE_EP_TYPE,
|
|
};
|
|
|
|
static const struct of_device_id artpec6_pcie_of_match[] = {
|
|
{
|
|
.compatible = "axis,artpec6-pcie",
|
|
.data = &artpec6_pcie_rc_of_data,
|
|
},
|
|
{
|
|
.compatible = "axis,artpec6-pcie-ep",
|
|
.data = &artpec6_pcie_ep_of_data,
|
|
},
|
|
{
|
|
.compatible = "axis,artpec7-pcie",
|
|
.data = &artpec7_pcie_rc_of_data,
|
|
},
|
|
{
|
|
.compatible = "axis,artpec7-pcie-ep",
|
|
.data = &artpec7_pcie_ep_of_data,
|
|
},
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver artpec6_pcie_driver = {
|
|
.probe = artpec6_pcie_probe,
|
|
.driver = {
|
|
.name = "artpec6-pcie",
|
|
.of_match_table = artpec6_pcie_of_match,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
};
|
|
builtin_platform_driver(artpec6_pcie_driver);
|