![Fabio Estevam](/assets/img/avatar_default.png)
When platform_get_irq() fails we should propagate the real error value instead of always returning -EINVAL. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Michal Simek <michal.simek@xilinx.com>
920 lines
24 KiB
C
920 lines
24 KiB
C
/*
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* PCIe host controller driver for NWL PCIe Bridge
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* Based on pcie-xilinx.c, pci-tegra.c
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*
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* (C) Copyright 2014 - 2015, Xilinx, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/msi.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/of_platform.h>
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#include <linux/of_irq.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/irqchip/chained_irq.h>
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/* Bridge core config registers */
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#define BRCFG_PCIE_RX0 0x00000000
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#define BRCFG_INTERRUPT 0x00000010
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#define BRCFG_PCIE_RX_MSG_FILTER 0x00000020
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/* Egress - Bridge translation registers */
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#define E_BREG_CAPABILITIES 0x00000200
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#define E_BREG_CONTROL 0x00000208
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#define E_BREG_BASE_LO 0x00000210
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#define E_BREG_BASE_HI 0x00000214
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#define E_ECAM_CAPABILITIES 0x00000220
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#define E_ECAM_CONTROL 0x00000228
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#define E_ECAM_BASE_LO 0x00000230
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#define E_ECAM_BASE_HI 0x00000234
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/* Ingress - address translations */
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#define I_MSII_CAPABILITIES 0x00000300
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#define I_MSII_CONTROL 0x00000308
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#define I_MSII_BASE_LO 0x00000310
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#define I_MSII_BASE_HI 0x00000314
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#define I_ISUB_CONTROL 0x000003E8
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#define SET_ISUB_CONTROL BIT(0)
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/* Rxed msg fifo - Interrupt status registers */
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#define MSGF_MISC_STATUS 0x00000400
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#define MSGF_MISC_MASK 0x00000404
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#define MSGF_LEG_STATUS 0x00000420
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#define MSGF_LEG_MASK 0x00000424
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#define MSGF_MSI_STATUS_LO 0x00000440
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#define MSGF_MSI_STATUS_HI 0x00000444
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#define MSGF_MSI_MASK_LO 0x00000448
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#define MSGF_MSI_MASK_HI 0x0000044C
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/* Msg filter mask bits */
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#define CFG_ENABLE_PM_MSG_FWD BIT(1)
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#define CFG_ENABLE_INT_MSG_FWD BIT(2)
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#define CFG_ENABLE_ERR_MSG_FWD BIT(3)
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#define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \
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CFG_ENABLE_INT_MSG_FWD | \
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CFG_ENABLE_ERR_MSG_FWD)
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/* Misc interrupt status mask bits */
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#define MSGF_MISC_SR_RXMSG_AVAIL BIT(0)
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#define MSGF_MISC_SR_RXMSG_OVER BIT(1)
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#define MSGF_MISC_SR_SLAVE_ERR BIT(4)
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#define MSGF_MISC_SR_MASTER_ERR BIT(5)
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#define MSGF_MISC_SR_I_ADDR_ERR BIT(6)
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#define MSGF_MISC_SR_E_ADDR_ERR BIT(7)
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#define MSGF_MISC_SR_FATAL_AER BIT(16)
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#define MSGF_MISC_SR_NON_FATAL_AER BIT(17)
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#define MSGF_MISC_SR_CORR_AER BIT(18)
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#define MSGF_MISC_SR_UR_DETECT BIT(20)
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#define MSGF_MISC_SR_NON_FATAL_DEV BIT(22)
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#define MSGF_MISC_SR_FATAL_DEV BIT(23)
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#define MSGF_MISC_SR_LINK_DOWN BIT(24)
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#define MSGF_MSIC_SR_LINK_AUTO_BWIDTH BIT(25)
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#define MSGF_MSIC_SR_LINK_BWIDTH BIT(26)
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#define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \
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MSGF_MISC_SR_RXMSG_OVER | \
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MSGF_MISC_SR_SLAVE_ERR | \
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MSGF_MISC_SR_MASTER_ERR | \
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MSGF_MISC_SR_I_ADDR_ERR | \
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MSGF_MISC_SR_E_ADDR_ERR | \
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MSGF_MISC_SR_FATAL_AER | \
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MSGF_MISC_SR_NON_FATAL_AER | \
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MSGF_MISC_SR_CORR_AER | \
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MSGF_MISC_SR_UR_DETECT | \
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MSGF_MISC_SR_NON_FATAL_DEV | \
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MSGF_MISC_SR_FATAL_DEV | \
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MSGF_MISC_SR_LINK_DOWN | \
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MSGF_MSIC_SR_LINK_AUTO_BWIDTH | \
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MSGF_MSIC_SR_LINK_BWIDTH)
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/* Legacy interrupt status mask bits */
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#define MSGF_LEG_SR_INTA BIT(0)
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#define MSGF_LEG_SR_INTB BIT(1)
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#define MSGF_LEG_SR_INTC BIT(2)
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#define MSGF_LEG_SR_INTD BIT(3)
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#define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \
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MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD)
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/* MSI interrupt status mask bits */
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#define MSGF_MSI_SR_LO_MASK GENMASK(31, 0)
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#define MSGF_MSI_SR_HI_MASK GENMASK(31, 0)
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#define MSII_PRESENT BIT(0)
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#define MSII_ENABLE BIT(0)
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#define MSII_STATUS_ENABLE BIT(15)
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/* Bridge config interrupt mask */
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#define BRCFG_INTERRUPT_MASK BIT(0)
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#define BREG_PRESENT BIT(0)
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#define BREG_ENABLE BIT(0)
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#define BREG_ENABLE_FORCE BIT(1)
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/* E_ECAM status mask bits */
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#define E_ECAM_PRESENT BIT(0)
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#define E_ECAM_CR_ENABLE BIT(0)
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#define E_ECAM_SIZE_LOC GENMASK(20, 16)
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#define E_ECAM_SIZE_SHIFT 16
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#define ECAM_BUS_LOC_SHIFT 20
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#define ECAM_DEV_LOC_SHIFT 12
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#define NWL_ECAM_VALUE_DEFAULT 12
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#define CFG_DMA_REG_BAR GENMASK(2, 0)
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#define INT_PCI_MSI_NR (2 * 32)
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/* Readin the PS_LINKUP */
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#define PS_LINKUP_OFFSET 0x00000238
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#define PCIE_PHY_LINKUP_BIT BIT(0)
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#define PHY_RDY_LINKUP_BIT BIT(1)
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/* Parameters for the waiting for link up routine */
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#define LINK_WAIT_MAX_RETRIES 10
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#define LINK_WAIT_USLEEP_MIN 90000
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#define LINK_WAIT_USLEEP_MAX 100000
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struct nwl_msi { /* MSI information */
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struct irq_domain *msi_domain;
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unsigned long *bitmap;
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struct irq_domain *dev_domain;
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struct mutex lock; /* protect bitmap variable */
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int irq_msi0;
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int irq_msi1;
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};
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struct nwl_pcie {
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struct device *dev;
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void __iomem *breg_base;
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void __iomem *pcireg_base;
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void __iomem *ecam_base;
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phys_addr_t phys_breg_base; /* Physical Bridge Register Base */
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phys_addr_t phys_pcie_reg_base; /* Physical PCIe Controller Base */
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phys_addr_t phys_ecam_base; /* Physical Configuration Base */
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u32 breg_size;
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u32 pcie_reg_size;
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u32 ecam_size;
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int irq_intx;
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int irq_misc;
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u32 ecam_value;
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u8 last_busno;
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u8 root_busno;
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struct nwl_msi msi;
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struct irq_domain *legacy_irq_domain;
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raw_spinlock_t leg_mask_lock;
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};
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static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off)
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{
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return readl(pcie->breg_base + off);
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}
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static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off)
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{
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writel(val, pcie->breg_base + off);
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}
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static bool nwl_pcie_link_up(struct nwl_pcie *pcie)
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{
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if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PCIE_PHY_LINKUP_BIT)
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return true;
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return false;
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}
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static bool nwl_phy_link_up(struct nwl_pcie *pcie)
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{
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if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PHY_RDY_LINKUP_BIT)
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return true;
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return false;
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}
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static int nwl_wait_for_link(struct nwl_pcie *pcie)
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{
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struct device *dev = pcie->dev;
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int retries;
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/* check if the link is up or not */
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for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
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if (nwl_phy_link_up(pcie))
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return 0;
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usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
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}
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dev_err(dev, "PHY link never came up\n");
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return -ETIMEDOUT;
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}
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static bool nwl_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
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{
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struct nwl_pcie *pcie = bus->sysdata;
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/* Check link before accessing downstream ports */
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if (bus->number != pcie->root_busno) {
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if (!nwl_pcie_link_up(pcie))
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return false;
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}
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/* Only one device down on each root port */
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if (bus->number == pcie->root_busno && devfn > 0)
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return false;
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return true;
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}
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/**
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* nwl_pcie_map_bus - Get configuration base
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*
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* @bus: Bus structure of current bus
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* @devfn: Device/function
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* @where: Offset from base
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*
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* Return: Base address of the configuration space needed to be
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* accessed.
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*/
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static void __iomem *nwl_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
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int where)
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{
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struct nwl_pcie *pcie = bus->sysdata;
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int relbus;
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if (!nwl_pcie_valid_device(bus, devfn))
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return NULL;
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relbus = (bus->number << ECAM_BUS_LOC_SHIFT) |
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(devfn << ECAM_DEV_LOC_SHIFT);
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return pcie->ecam_base + relbus + where;
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}
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/* PCIe operations */
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static struct pci_ops nwl_pcie_ops = {
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.map_bus = nwl_pcie_map_bus,
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.read = pci_generic_config_read,
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.write = pci_generic_config_write,
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};
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static irqreturn_t nwl_pcie_misc_handler(int irq, void *data)
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{
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struct nwl_pcie *pcie = data;
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struct device *dev = pcie->dev;
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u32 misc_stat;
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/* Checking for misc interrupts */
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misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
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MSGF_MISC_SR_MASKALL;
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if (!misc_stat)
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return IRQ_NONE;
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if (misc_stat & MSGF_MISC_SR_RXMSG_OVER)
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dev_err(dev, "Received Message FIFO Overflow\n");
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if (misc_stat & MSGF_MISC_SR_SLAVE_ERR)
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dev_err(dev, "Slave error\n");
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if (misc_stat & MSGF_MISC_SR_MASTER_ERR)
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dev_err(dev, "Master error\n");
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if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR)
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dev_err(dev, "In Misc Ingress address translation error\n");
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if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR)
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dev_err(dev, "In Misc Egress address translation error\n");
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if (misc_stat & MSGF_MISC_SR_FATAL_AER)
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dev_err(dev, "Fatal Error in AER Capability\n");
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if (misc_stat & MSGF_MISC_SR_NON_FATAL_AER)
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dev_err(dev, "Non-Fatal Error in AER Capability\n");
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if (misc_stat & MSGF_MISC_SR_CORR_AER)
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dev_err(dev, "Correctable Error in AER Capability\n");
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if (misc_stat & MSGF_MISC_SR_UR_DETECT)
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dev_err(dev, "Unsupported request Detected\n");
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if (misc_stat & MSGF_MISC_SR_NON_FATAL_DEV)
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dev_err(dev, "Non-Fatal Error Detected\n");
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if (misc_stat & MSGF_MISC_SR_FATAL_DEV)
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dev_err(dev, "Fatal Error Detected\n");
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if (misc_stat & MSGF_MSIC_SR_LINK_AUTO_BWIDTH)
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dev_info(dev, "Link Autonomous Bandwidth Management Status bit set\n");
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if (misc_stat & MSGF_MSIC_SR_LINK_BWIDTH)
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dev_info(dev, "Link Bandwidth Management Status bit set\n");
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/* Clear misc interrupt status */
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nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS);
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return IRQ_HANDLED;
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}
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static void nwl_pcie_leg_handler(struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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struct nwl_pcie *pcie;
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unsigned long status;
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u32 bit;
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u32 virq;
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chained_irq_enter(chip, desc);
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pcie = irq_desc_get_handler_data(desc);
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while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
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MSGF_LEG_SR_MASKALL) != 0) {
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for_each_set_bit(bit, &status, PCI_NUM_INTX) {
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virq = irq_find_mapping(pcie->legacy_irq_domain, bit);
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if (virq)
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generic_handle_irq(virq);
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}
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}
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chained_irq_exit(chip, desc);
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}
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static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg)
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{
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struct nwl_msi *msi;
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unsigned long status;
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u32 bit;
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u32 virq;
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msi = &pcie->msi;
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while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) {
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for_each_set_bit(bit, &status, 32) {
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nwl_bridge_writel(pcie, 1 << bit, status_reg);
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virq = irq_find_mapping(msi->dev_domain, bit);
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if (virq)
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generic_handle_irq(virq);
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}
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}
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}
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static void nwl_pcie_msi_handler_high(struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
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chained_irq_enter(chip, desc);
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nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_HI);
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chained_irq_exit(chip, desc);
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}
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static void nwl_pcie_msi_handler_low(struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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struct nwl_pcie *pcie = irq_desc_get_handler_data(desc);
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chained_irq_enter(chip, desc);
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nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_LO);
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chained_irq_exit(chip, desc);
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}
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static void nwl_mask_leg_irq(struct irq_data *data)
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{
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struct irq_desc *desc = irq_to_desc(data->irq);
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struct nwl_pcie *pcie;
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unsigned long flags;
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u32 mask;
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u32 val;
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pcie = irq_desc_get_chip_data(desc);
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mask = 1 << (data->hwirq - 1);
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raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
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val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
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nwl_bridge_writel(pcie, (val & (~mask)), MSGF_LEG_MASK);
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raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
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}
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static void nwl_unmask_leg_irq(struct irq_data *data)
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{
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struct irq_desc *desc = irq_to_desc(data->irq);
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struct nwl_pcie *pcie;
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unsigned long flags;
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u32 mask;
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u32 val;
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pcie = irq_desc_get_chip_data(desc);
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mask = 1 << (data->hwirq - 1);
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raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
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val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
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nwl_bridge_writel(pcie, (val | mask), MSGF_LEG_MASK);
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raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags);
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}
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static struct irq_chip nwl_leg_irq_chip = {
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.name = "nwl_pcie:legacy",
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.irq_enable = nwl_unmask_leg_irq,
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.irq_disable = nwl_mask_leg_irq,
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.irq_mask = nwl_mask_leg_irq,
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.irq_unmask = nwl_unmask_leg_irq,
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};
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static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq,
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irq_hw_number_t hwirq)
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{
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irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_level_irq);
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irq_set_chip_data(irq, domain->host_data);
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irq_set_status_flags(irq, IRQ_LEVEL);
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return 0;
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}
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static const struct irq_domain_ops legacy_domain_ops = {
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.map = nwl_legacy_map,
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.xlate = pci_irqd_intx_xlate,
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};
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#ifdef CONFIG_PCI_MSI
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static struct irq_chip nwl_msi_irq_chip = {
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.name = "nwl_pcie:msi",
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.irq_enable = unmask_msi_irq,
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.irq_disable = mask_msi_irq,
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.irq_mask = mask_msi_irq,
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.irq_unmask = unmask_msi_irq,
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};
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static struct msi_domain_info nwl_msi_domain_info = {
|
|
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
|
|
MSI_FLAG_MULTI_PCI_MSI),
|
|
.chip = &nwl_msi_irq_chip,
|
|
};
|
|
#endif
|
|
|
|
static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
|
|
{
|
|
struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
|
|
phys_addr_t msi_addr = pcie->phys_pcie_reg_base;
|
|
|
|
msg->address_lo = lower_32_bits(msi_addr);
|
|
msg->address_hi = upper_32_bits(msi_addr);
|
|
msg->data = data->hwirq;
|
|
}
|
|
|
|
static int nwl_msi_set_affinity(struct irq_data *irq_data,
|
|
const struct cpumask *mask, bool force)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct irq_chip nwl_irq_chip = {
|
|
.name = "Xilinx MSI",
|
|
.irq_compose_msi_msg = nwl_compose_msi_msg,
|
|
.irq_set_affinity = nwl_msi_set_affinity,
|
|
};
|
|
|
|
static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs, void *args)
|
|
{
|
|
struct nwl_pcie *pcie = domain->host_data;
|
|
struct nwl_msi *msi = &pcie->msi;
|
|
int bit;
|
|
int i;
|
|
|
|
mutex_lock(&msi->lock);
|
|
bit = bitmap_find_next_zero_area(msi->bitmap, INT_PCI_MSI_NR, 0,
|
|
nr_irqs, 0);
|
|
if (bit >= INT_PCI_MSI_NR) {
|
|
mutex_unlock(&msi->lock);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
bitmap_set(msi->bitmap, bit, nr_irqs);
|
|
|
|
for (i = 0; i < nr_irqs; i++) {
|
|
irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip,
|
|
domain->host_data, handle_simple_irq,
|
|
NULL, NULL);
|
|
}
|
|
mutex_unlock(&msi->lock);
|
|
return 0;
|
|
}
|
|
|
|
static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct irq_data *data = irq_domain_get_irq_data(domain, virq);
|
|
struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
|
|
struct nwl_msi *msi = &pcie->msi;
|
|
|
|
mutex_lock(&msi->lock);
|
|
bitmap_clear(msi->bitmap, data->hwirq, nr_irqs);
|
|
mutex_unlock(&msi->lock);
|
|
}
|
|
|
|
static const struct irq_domain_ops dev_msi_domain_ops = {
|
|
.alloc = nwl_irq_domain_alloc,
|
|
.free = nwl_irq_domain_free,
|
|
};
|
|
|
|
static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie)
|
|
{
|
|
#ifdef CONFIG_PCI_MSI
|
|
struct device *dev = pcie->dev;
|
|
struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node);
|
|
struct nwl_msi *msi = &pcie->msi;
|
|
|
|
msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
|
|
&dev_msi_domain_ops, pcie);
|
|
if (!msi->dev_domain) {
|
|
dev_err(dev, "failed to create dev IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
msi->msi_domain = pci_msi_create_irq_domain(fwnode,
|
|
&nwl_msi_domain_info,
|
|
msi->dev_domain);
|
|
if (!msi->msi_domain) {
|
|
dev_err(dev, "failed to create msi IRQ domain\n");
|
|
irq_domain_remove(msi->dev_domain);
|
|
return -ENOMEM;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct device_node *node = dev->of_node;
|
|
struct device_node *legacy_intc_node;
|
|
|
|
legacy_intc_node = of_get_next_child(node, NULL);
|
|
if (!legacy_intc_node) {
|
|
dev_err(dev, "No legacy intc node found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node,
|
|
PCI_NUM_INTX,
|
|
&legacy_domain_ops,
|
|
pcie);
|
|
|
|
if (!pcie->legacy_irq_domain) {
|
|
dev_err(dev, "failed to create IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
raw_spin_lock_init(&pcie->leg_mask_lock);
|
|
nwl_pcie_init_msi_irq_domain(pcie);
|
|
return 0;
|
|
}
|
|
|
|
static int nwl_pcie_enable_msi(struct nwl_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct nwl_msi *msi = &pcie->msi;
|
|
unsigned long base;
|
|
int ret;
|
|
int size = BITS_TO_LONGS(INT_PCI_MSI_NR) * sizeof(long);
|
|
|
|
mutex_init(&msi->lock);
|
|
|
|
msi->bitmap = kzalloc(size, GFP_KERNEL);
|
|
if (!msi->bitmap)
|
|
return -ENOMEM;
|
|
|
|
/* Get msi_1 IRQ number */
|
|
msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1");
|
|
if (msi->irq_msi1 < 0) {
|
|
dev_err(dev, "failed to get IRQ#%d\n", msi->irq_msi1);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
irq_set_chained_handler_and_data(msi->irq_msi1,
|
|
nwl_pcie_msi_handler_high, pcie);
|
|
|
|
/* Get msi_0 IRQ number */
|
|
msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0");
|
|
if (msi->irq_msi0 < 0) {
|
|
dev_err(dev, "failed to get IRQ#%d\n", msi->irq_msi0);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
irq_set_chained_handler_and_data(msi->irq_msi0,
|
|
nwl_pcie_msi_handler_low, pcie);
|
|
|
|
/* Check for msii_present bit */
|
|
ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT;
|
|
if (!ret) {
|
|
dev_err(dev, "MSI not present\n");
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
/* Enable MSII */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
|
|
MSII_ENABLE, I_MSII_CONTROL);
|
|
|
|
/* Enable MSII status */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) |
|
|
MSII_STATUS_ENABLE, I_MSII_CONTROL);
|
|
|
|
/* setup AFI/FPCI range */
|
|
base = pcie->phys_pcie_reg_base;
|
|
nwl_bridge_writel(pcie, lower_32_bits(base), I_MSII_BASE_LO);
|
|
nwl_bridge_writel(pcie, upper_32_bits(base), I_MSII_BASE_HI);
|
|
|
|
/*
|
|
* For high range MSI interrupts: disable, clear any pending,
|
|
* and enable
|
|
*/
|
|
nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
|
|
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) &
|
|
MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI);
|
|
|
|
nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI);
|
|
|
|
/*
|
|
* For low range MSI interrupts: disable, clear any pending,
|
|
* and enable
|
|
*/
|
|
nwl_bridge_writel(pcie, (u32)~MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
|
|
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) &
|
|
MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO);
|
|
|
|
nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO);
|
|
|
|
return 0;
|
|
err:
|
|
kfree(msi->bitmap);
|
|
msi->bitmap = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
u32 breg_val, ecam_val, first_busno = 0;
|
|
int err;
|
|
|
|
breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT;
|
|
if (!breg_val) {
|
|
dev_err(dev, "BREG is not present\n");
|
|
return breg_val;
|
|
}
|
|
|
|
/* Write bridge_off to breg base */
|
|
nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_breg_base),
|
|
E_BREG_BASE_LO);
|
|
nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_breg_base),
|
|
E_BREG_BASE_HI);
|
|
|
|
/* Enable BREG */
|
|
nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE,
|
|
E_BREG_CONTROL);
|
|
|
|
/* Disable DMA channel registers */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) |
|
|
CFG_DMA_REG_BAR, BRCFG_PCIE_RX0);
|
|
|
|
/* Enable Ingress subtractive decode translation */
|
|
nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL);
|
|
|
|
/* Enable msg filtering details */
|
|
nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK,
|
|
BRCFG_PCIE_RX_MSG_FILTER);
|
|
|
|
err = nwl_wait_for_link(pcie);
|
|
if (err)
|
|
return err;
|
|
|
|
ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT;
|
|
if (!ecam_val) {
|
|
dev_err(dev, "ECAM is not present\n");
|
|
return ecam_val;
|
|
}
|
|
|
|
/* Enable ECAM */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
|
|
E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
|
|
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
|
|
(pcie->ecam_value << E_ECAM_SIZE_SHIFT),
|
|
E_ECAM_CONTROL);
|
|
|
|
nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
|
|
E_ECAM_BASE_LO);
|
|
nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base),
|
|
E_ECAM_BASE_HI);
|
|
|
|
/* Get bus range */
|
|
ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
|
|
pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
|
|
/* Write primary, secondary and subordinate bus numbers */
|
|
ecam_val = first_busno;
|
|
ecam_val |= (first_busno + 1) << 8;
|
|
ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
|
|
writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
|
|
|
|
if (nwl_pcie_link_up(pcie))
|
|
dev_info(dev, "Link is UP\n");
|
|
else
|
|
dev_info(dev, "Link is DOWN\n");
|
|
|
|
/* Get misc IRQ number */
|
|
pcie->irq_misc = platform_get_irq_byname(pdev, "misc");
|
|
if (pcie->irq_misc < 0) {
|
|
dev_err(dev, "failed to get misc IRQ %d\n",
|
|
pcie->irq_misc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = devm_request_irq(dev, pcie->irq_misc,
|
|
nwl_pcie_misc_handler, IRQF_SHARED,
|
|
"nwl_pcie:misc", pcie);
|
|
if (err) {
|
|
dev_err(dev, "fail to register misc IRQ#%d\n",
|
|
pcie->irq_misc);
|
|
return err;
|
|
}
|
|
|
|
/* Disable all misc interrupts */
|
|
nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
|
|
|
|
/* Clear pending misc interrupts */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) &
|
|
MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS);
|
|
|
|
/* Enable all misc interrupts */
|
|
nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK);
|
|
|
|
|
|
/* Disable all legacy interrupts */
|
|
nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
|
|
|
|
/* Clear pending legacy interrupts */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
|
|
MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
|
|
|
|
/* Enable all legacy interrupts */
|
|
nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
|
|
|
|
/* Enable the bridge config interrupt */
|
|
nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) |
|
|
BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
|
|
struct platform_device *pdev)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct device_node *node = dev->of_node;
|
|
struct resource *res;
|
|
const char *type;
|
|
|
|
/* Check for device type */
|
|
type = of_get_property(node, "device_type", NULL);
|
|
if (!type || strcmp(type, "pci")) {
|
|
dev_err(dev, "invalid \"device_type\" %s\n", type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
|
|
pcie->breg_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(pcie->breg_base))
|
|
return PTR_ERR(pcie->breg_base);
|
|
pcie->phys_breg_base = res->start;
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg");
|
|
pcie->pcireg_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(pcie->pcireg_base))
|
|
return PTR_ERR(pcie->pcireg_base);
|
|
pcie->phys_pcie_reg_base = res->start;
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
|
|
pcie->ecam_base = devm_pci_remap_cfg_resource(dev, res);
|
|
if (IS_ERR(pcie->ecam_base))
|
|
return PTR_ERR(pcie->ecam_base);
|
|
pcie->phys_ecam_base = res->start;
|
|
|
|
/* Get intx IRQ number */
|
|
pcie->irq_intx = platform_get_irq_byname(pdev, "intx");
|
|
if (pcie->irq_intx < 0) {
|
|
dev_err(dev, "failed to get intx IRQ %d\n", pcie->irq_intx);
|
|
return pcie->irq_intx;
|
|
}
|
|
|
|
irq_set_chained_handler_and_data(pcie->irq_intx,
|
|
nwl_pcie_leg_handler, pcie);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id nwl_pcie_of_match[] = {
|
|
{ .compatible = "xlnx,nwl-pcie-2.11", },
|
|
{}
|
|
};
|
|
|
|
static int nwl_pcie_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *node = dev->of_node;
|
|
struct nwl_pcie *pcie;
|
|
struct pci_bus *bus;
|
|
struct pci_bus *child;
|
|
struct pci_host_bridge *bridge;
|
|
int err;
|
|
resource_size_t iobase = 0;
|
|
LIST_HEAD(res);
|
|
|
|
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
|
|
if (!bridge)
|
|
return -ENODEV;
|
|
|
|
pcie = pci_host_bridge_priv(bridge);
|
|
|
|
pcie->dev = dev;
|
|
pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
|
|
|
|
err = nwl_pcie_parse_dt(pcie, pdev);
|
|
if (err) {
|
|
dev_err(dev, "Parsing DT failed\n");
|
|
return err;
|
|
}
|
|
|
|
err = nwl_pcie_bridge_init(pcie);
|
|
if (err) {
|
|
dev_err(dev, "HW Initialization failed\n");
|
|
return err;
|
|
}
|
|
|
|
err = of_pci_get_host_bridge_resources(node, 0, 0xff, &res, &iobase);
|
|
if (err) {
|
|
dev_err(dev, "Getting bridge resources failed\n");
|
|
return err;
|
|
}
|
|
|
|
err = devm_request_pci_bus_resources(dev, &res);
|
|
if (err)
|
|
goto error;
|
|
|
|
err = nwl_pcie_init_irq_domain(pcie);
|
|
if (err) {
|
|
dev_err(dev, "Failed creating IRQ Domain\n");
|
|
goto error;
|
|
}
|
|
|
|
list_splice_init(&res, &bridge->windows);
|
|
bridge->dev.parent = dev;
|
|
bridge->sysdata = pcie;
|
|
bridge->busnr = pcie->root_busno;
|
|
bridge->ops = &nwl_pcie_ops;
|
|
bridge->map_irq = of_irq_parse_and_map_pci;
|
|
bridge->swizzle_irq = pci_common_swizzle;
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
|
err = nwl_pcie_enable_msi(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to enable MSI support: %d\n", err);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
err = pci_scan_root_bus_bridge(bridge);
|
|
if (err)
|
|
goto error;
|
|
|
|
bus = bridge->bus;
|
|
|
|
pci_assign_unassigned_bus_resources(bus);
|
|
list_for_each_entry(child, &bus->children, node)
|
|
pcie_bus_configure_settings(child);
|
|
pci_bus_add_devices(bus);
|
|
return 0;
|
|
|
|
error:
|
|
pci_free_resource_list(&res);
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver nwl_pcie_driver = {
|
|
.driver = {
|
|
.name = "nwl-pcie",
|
|
.suppress_bind_attrs = true,
|
|
.of_match_table = nwl_pcie_of_match,
|
|
},
|
|
.probe = nwl_pcie_probe,
|
|
};
|
|
builtin_platform_driver(nwl_pcie_driver);
|