| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Thomas Petazzoni | 3448 | 67.54% | 5 | 14.71% |
| Marek Behún | 487 | 9.54% | 2 | 5.88% |
| Zachary Zhang | 486 | 9.52% | 1 | 2.94% |
| Pali Rohár | 260 | 5.09% | 5 | 14.71% |
| Remi Pommarel | 181 | 3.55% | 4 | 11.76% |
| Victor Gu | 85 | 1.67% | 2 | 5.88% |
| Björn Helgaas | 49 | 0.96% | 5 | 14.71% |
| Lorenzo Pieralisi | 33 | 0.65% | 1 | 2.94% |
| Wen Yang | 23 | 0.45% | 1 | 2.94% |
| Rob Herring | 20 | 0.39% | 2 | 5.88% |
| Grzegorz Jaszczyk | 15 | 0.29% | 1 | 2.94% |
| Aman Sharma | 9 | 0.18% | 1 | 2.94% |
| Krzysztof Wilczynski | 3 | 0.06% | 1 | 2.94% |
| Dejin Zheng | 3 | 0.06% | 1 | 2.94% |
| Paul Burton | 2 | 0.04% | 1 | 2.94% |
| Wei Yongjun | 1 | 0.02% | 1 | 2.94% |
| Total | 5105 | 34 |
// SPDX-License-Identifier: GPL-2.0 /* * Driver for the Aardvark PCIe controller, used on Marvell Armada * 3700. * * Copyright (C) 2016 Marvell * * Author: Hezi Shahmoon <hezi.shahmoon@marvell.com> */ #include <linux/delay.h> #include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/msi.h> #include <linux/of_address.h> #include <linux/of_gpio.h> #include <linux/of_pci.h> #include "../pci.h" #include "../pci-bridge-emul.h" /* PCIe core registers */ #define PCIE_CORE_DEV_ID_REG 0x0 #define PCIE_CORE_CMD_STATUS_REG 0x4 #define PCIE_CORE_CMD_IO_ACCESS_EN BIT(0) #define PCIE_CORE_CMD_MEM_ACCESS_EN BIT(1) #define PCIE_CORE_CMD_MEM_IO_REQ_EN BIT(2) #define PCIE_CORE_DEV_REV_REG 0x8 #define PCIE_CORE_PCIEXP_CAP 0xc0 #define PCIE_CORE_ERR_CAPCTL_REG 0x118 #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX BIT(5) #define PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN BIT(6) #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK BIT(7) #define PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV BIT(8) #define PCIE_CORE_INT_A_ASSERT_ENABLE 1 #define PCIE_CORE_INT_B_ASSERT_ENABLE 2 #define PCIE_CORE_INT_C_ASSERT_ENABLE 3 #define PCIE_CORE_INT_D_ASSERT_ENABLE 4 /* PIO registers base address and register offsets */ #define PIO_BASE_ADDR 0x4000 #define PIO_CTRL (PIO_BASE_ADDR + 0x0) #define PIO_CTRL_TYPE_MASK GENMASK(3, 0) #define PIO_CTRL_ADDR_WIN_DISABLE BIT(24) #define PIO_STAT (PIO_BASE_ADDR + 0x4) #define PIO_COMPLETION_STATUS_SHIFT 7 #define PIO_COMPLETION_STATUS_MASK GENMASK(9, 7) #define PIO_COMPLETION_STATUS_OK 0 #define PIO_COMPLETION_STATUS_UR 1 #define PIO_COMPLETION_STATUS_CRS 2 #define PIO_COMPLETION_STATUS_CA 4 #define PIO_NON_POSTED_REQ BIT(0) #define PIO_ADDR_LS (PIO_BASE_ADDR + 0x8) #define PIO_ADDR_MS (PIO_BASE_ADDR + 0xc) #define PIO_WR_DATA (PIO_BASE_ADDR + 0x10) #define PIO_WR_DATA_STRB (PIO_BASE_ADDR + 0x14) #define PIO_RD_DATA (PIO_BASE_ADDR + 0x18) #define PIO_START (PIO_BASE_ADDR + 0x1c) #define PIO_ISR (PIO_BASE_ADDR + 0x20) #define PIO_ISRM (PIO_BASE_ADDR + 0x24) /* Aardvark Control registers */ #define CONTROL_BASE_ADDR 0x4800 #define PCIE_CORE_CTRL0_REG (CONTROL_BASE_ADDR + 0x0) #define PCIE_GEN_SEL_MSK 0x3 #define PCIE_GEN_SEL_SHIFT 0x0 #define SPEED_GEN_1 0 #define SPEED_GEN_2 1 #define SPEED_GEN_3 2 #define IS_RC_MSK 1 #define IS_RC_SHIFT 2 #define LANE_CNT_MSK 0x18 #define LANE_CNT_SHIFT 0x3 #define LANE_COUNT_1 (0 << LANE_CNT_SHIFT) #define LANE_COUNT_2 (1 << LANE_CNT_SHIFT) #define LANE_COUNT_4 (2 << LANE_CNT_SHIFT) #define LANE_COUNT_8 (3 << LANE_CNT_SHIFT) #define LINK_TRAINING_EN BIT(6) #define LEGACY_INTA BIT(28) #define LEGACY_INTB BIT(29) #define LEGACY_INTC BIT(30) #define LEGACY_INTD BIT(31) #define PCIE_CORE_CTRL1_REG (CONTROL_BASE_ADDR + 0x4) #define HOT_RESET_GEN BIT(0) #define PCIE_CORE_CTRL2_REG (CONTROL_BASE_ADDR + 0x8) #define PCIE_CORE_CTRL2_RESERVED 0x7 #define PCIE_CORE_CTRL2_TD_ENABLE BIT(4) #define PCIE_CORE_CTRL2_STRICT_ORDER_ENABLE BIT(5) #define PCIE_CORE_CTRL2_OB_WIN_ENABLE BIT(6) #define PCIE_CORE_CTRL2_MSI_ENABLE BIT(10) #define PCIE_CORE_REF_CLK_REG (CONTROL_BASE_ADDR + 0x14) #define PCIE_CORE_REF_CLK_TX_ENABLE BIT(1) #define PCIE_MSG_LOG_REG (CONTROL_BASE_ADDR + 0x30) #define PCIE_ISR0_REG (CONTROL_BASE_ADDR + 0x40) #define PCIE_MSG_PM_PME_MASK BIT(7) #define PCIE_ISR0_MASK_REG (CONTROL_BASE_ADDR + 0x44) #define PCIE_ISR0_MSI_INT_PENDING BIT(24) #define PCIE_ISR0_INTX_ASSERT(val) BIT(16 + (val)) #define PCIE_ISR0_INTX_DEASSERT(val) BIT(20 + (val)) #define PCIE_ISR0_ALL_MASK GENMASK(26, 0) #define PCIE_ISR1_REG (CONTROL_BASE_ADDR + 0x48) #define PCIE_ISR1_MASK_REG (CONTROL_BASE_ADDR + 0x4C) #define PCIE_ISR1_POWER_STATE_CHANGE BIT(4) #define PCIE_ISR1_FLUSH BIT(5) #define PCIE_ISR1_INTX_ASSERT(val) BIT(8 + (val)) #define PCIE_ISR1_ALL_MASK GENMASK(11, 4) #define PCIE_MSI_ADDR_LOW_REG (CONTROL_BASE_ADDR + 0x50) #define PCIE_MSI_ADDR_HIGH_REG (CONTROL_BASE_ADDR + 0x54) #define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58) #define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C) #define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C) /* LMI registers base address and register offsets */ #define LMI_BASE_ADDR 0x6000 #define CFG_REG (LMI_BASE_ADDR + 0x0) #define LTSSM_SHIFT 24 #define LTSSM_MASK 0x3f #define LTSSM_L0 0x10 #define RC_BAR_CONFIG 0x300 /* PCIe core controller registers */ #define CTRL_CORE_BASE_ADDR 0x18000 #define CTRL_CONFIG_REG (CTRL_CORE_BASE_ADDR + 0x0) #define CTRL_MODE_SHIFT 0x0 #define CTRL_MODE_MASK 0x1 #define PCIE_CORE_MODE_DIRECT 0x0 #define PCIE_CORE_MODE_COMMAND 0x1 /* PCIe Central Interrupts Registers */ #define CENTRAL_INT_BASE_ADDR 0x1b000 #define HOST_CTRL_INT_STATUS_REG (CENTRAL_INT_BASE_ADDR + 0x0) #define HOST_CTRL_INT_MASK_REG (CENTRAL_INT_BASE_ADDR + 0x4) #define PCIE_IRQ_CMDQ_INT BIT(0) #define PCIE_IRQ_MSI_STATUS_INT BIT(1) #define PCIE_IRQ_CMD_SENT_DONE BIT(3) #define PCIE_IRQ_DMA_INT BIT(4) #define PCIE_IRQ_IB_DXFERDONE BIT(5) #define PCIE_IRQ_OB_DXFERDONE BIT(6) #define PCIE_IRQ_OB_RXFERDONE BIT(7) #define PCIE_IRQ_COMPQ_INT BIT(12) #define PCIE_IRQ_DIR_RD_DDR_DET BIT(13) #define PCIE_IRQ_DIR_WR_DDR_DET BIT(14) #define PCIE_IRQ_CORE_INT BIT(16) #define PCIE_IRQ_CORE_INT_PIO BIT(17) #define PCIE_IRQ_DPMU_INT BIT(18) #define PCIE_IRQ_PCIE_MIS_INT BIT(19) #define PCIE_IRQ_MSI_INT1_DET BIT(20) #define PCIE_IRQ_MSI_INT2_DET BIT(21) #define PCIE_IRQ_RC_DBELL_DET BIT(22) #define PCIE_IRQ_EP_STATUS BIT(23) #define PCIE_IRQ_ALL_MASK 0xfff0fb #define PCIE_IRQ_ENABLE_INTS_MASK PCIE_IRQ_CORE_INT /* Transaction types */ #define PCIE_CONFIG_RD_TYPE0 0x8 #define PCIE_CONFIG_RD_TYPE1 0x9 #define PCIE_CONFIG_WR_TYPE0 0xa #define PCIE_CONFIG_WR_TYPE1 0xb #define PCIE_CONF_BUS(bus) (((bus) & 0xff) << 20) #define PCIE_CONF_DEV(dev) (((dev) & 0x1f) << 15) #define PCIE_CONF_FUNC(fun) (((fun) & 0x7) << 12) #define PCIE_CONF_REG(reg) ((reg) & 0xffc) #define PCIE_CONF_ADDR(bus, devfn, where) \ (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \ PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where)) #define PIO_RETRY_CNT 500 #define PIO_RETRY_DELAY 2 /* 2 us*/ #define LINK_WAIT_MAX_RETRIES 10 #define LINK_WAIT_USLEEP_MIN 90000 #define LINK_WAIT_USLEEP_MAX 100000 #define RETRAIN_WAIT_MAX_RETRIES 10 #define RETRAIN_WAIT_USLEEP_US 2000 #define MSI_IRQ_NUM 32 struct advk_pcie { struct platform_device *pdev; void __iomem *base; struct irq_domain *irq_domain; struct irq_chip irq_chip; struct irq_domain *msi_domain; struct irq_domain *msi_inner_domain; struct irq_chip msi_bottom_irq_chip; struct irq_chip msi_irq_chip; struct msi_domain_info msi_domain_info; DECLARE_BITMAP(msi_used, MSI_IRQ_NUM); struct mutex msi_used_lock; u16 msi_msg; int link_gen; struct pci_bridge_emul bridge; struct gpio_desc *reset_gpio; struct phy *phy; }; static inline void advk_writel(struct advk_pcie *pcie, u32 val, u64 reg) { writel(val, pcie->base + reg); } static inline u32 advk_readl(struct advk_pcie *pcie, u64 reg) { return readl(pcie->base + reg); } static inline u16 advk_read16(struct advk_pcie *pcie, u64 reg) { return advk_readl(pcie, (reg & ~0x3)) >> ((reg & 0x3) * 8); } static int advk_pcie_link_up(struct advk_pcie *pcie) { u32 val, ltssm_state; val = advk_readl(pcie, CFG_REG); ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK; return ltssm_state >= LTSSM_L0; } static int advk_pcie_wait_for_link(struct advk_pcie *pcie) { int retries; /* check if the link is up or not */ for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) { if (advk_pcie_link_up(pcie)) return 0; usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX); } return -ETIMEDOUT; } static void advk_pcie_wait_for_retrain(struct advk_pcie *pcie) { size_t retries; for (retries = 0; retries < RETRAIN_WAIT_MAX_RETRIES; ++retries) { if (!advk_pcie_link_up(pcie)) break; udelay(RETRAIN_WAIT_USLEEP_US); } } static int advk_pcie_train_at_gen(struct advk_pcie *pcie, int gen) { int ret, neg_gen; u32 reg; /* Setup link speed */ reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG); reg &= ~PCIE_GEN_SEL_MSK; if (gen == 3) reg |= SPEED_GEN_3; else if (gen == 2) reg |= SPEED_GEN_2; else reg |= SPEED_GEN_1; advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG); /* * Enable link training. This is not needed in every call to this * function, just once suffices, but it does not break anything either. */ reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG); reg |= LINK_TRAINING_EN; advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG); /* * Start link training immediately after enabling it. * This solves problems for some buggy cards. */ reg = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_LNKCTL); reg |= PCI_EXP_LNKCTL_RL; advk_writel(pcie, reg, PCIE_CORE_PCIEXP_CAP + PCI_EXP_LNKCTL); ret = advk_pcie_wait_for_link(pcie); if (ret) return ret; reg = advk_read16(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_LNKSTA); neg_gen = reg & PCI_EXP_LNKSTA_CLS; return neg_gen; } static void advk_pcie_train_link(struct advk_pcie *pcie) { struct device *dev = &pcie->pdev->dev; int neg_gen = -1, gen; /* * Try link training at link gen specified by device tree property * 'max-link-speed'. If this fails, iteratively train at lower gen. */ for (gen = pcie->link_gen; gen > 0; --gen) { neg_gen = advk_pcie_train_at_gen(pcie, gen); if (neg_gen > 0) break; } if (neg_gen < 0) goto err; /* * After successful training if negotiated gen is lower than requested, * train again on negotiated gen. This solves some stability issues for * some buggy gen1 cards. */ if (neg_gen < gen) { gen = neg_gen; neg_gen = advk_pcie_train_at_gen(pcie, gen); } if (neg_gen == gen) { dev_info(dev, "link up at gen %i\n", gen); return; } err: dev_err(dev, "link never came up\n"); } static void advk_pcie_issue_perst(struct advk_pcie *pcie) { u32 reg; if (!pcie->reset_gpio) return; /* PERST does not work for some cards when link training is enabled */ reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG); reg &= ~LINK_TRAINING_EN; advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG); /* 10ms delay is needed for some cards */ dev_info(&pcie->pdev->dev, "issuing PERST via reset GPIO for 10ms\n"); gpiod_set_value_cansleep(pcie->reset_gpio, 1); usleep_range(10000, 11000); gpiod_set_value_cansleep(pcie->reset_gpio, 0); } static void advk_pcie_setup_hw(struct advk_pcie *pcie) { u32 reg; advk_pcie_issue_perst(pcie); /* Enable TX */ reg = advk_readl(pcie, PCIE_CORE_REF_CLK_REG); reg |= PCIE_CORE_REF_CLK_TX_ENABLE; advk_writel(pcie, reg, PCIE_CORE_REF_CLK_REG); /* Set to Direct mode */ reg = advk_readl(pcie, CTRL_CONFIG_REG); reg &= ~(CTRL_MODE_MASK << CTRL_MODE_SHIFT); reg |= ((PCIE_CORE_MODE_DIRECT & CTRL_MODE_MASK) << CTRL_MODE_SHIFT); advk_writel(pcie, reg, CTRL_CONFIG_REG); /* Set PCI global control register to RC mode */ reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG); reg |= (IS_RC_MSK << IS_RC_SHIFT); advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG); /* Set Advanced Error Capabilities and Control PF0 register */ reg = PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX | PCIE_CORE_ERR_CAPCTL_ECRC_CHK_TX_EN | PCIE_CORE_ERR_CAPCTL_ECRC_CHCK | PCIE_CORE_ERR_CAPCTL_ECRC_CHCK_RCV; advk_writel(pcie, reg, PCIE_CORE_ERR_CAPCTL_REG); /* Set PCIe Device Control register */ reg = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL); reg &= ~PCI_EXP_DEVCTL_RELAX_EN; reg &= ~PCI_EXP_DEVCTL_NOSNOOP_EN; reg &= ~PCI_EXP_DEVCTL_READRQ; reg |= PCI_EXP_DEVCTL_PAYLOAD; /* Set max payload size */ reg |= PCI_EXP_DEVCTL_READRQ_512B; advk_writel(pcie, reg, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL); /* Program PCIe Control 2 to disable strict ordering */ reg = PCIE_CORE_CTRL2_RESERVED | PCIE_CORE_CTRL2_TD_ENABLE; advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG); /* Set lane X1 */ reg = advk_readl(pcie, PCIE_CORE_CTRL0_REG); reg &= ~LANE_CNT_MSK; reg |= LANE_COUNT_1; advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG); /* Enable MSI */ reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG); reg |= PCIE_CORE_CTRL2_MSI_ENABLE; advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG); /* Clear all interrupts */ advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_REG); advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG); advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG); /* Disable All ISR0/1 Sources */ reg = PCIE_ISR0_ALL_MASK; reg &= ~PCIE_ISR0_MSI_INT_PENDING; advk_writel(pcie, reg, PCIE_ISR0_MASK_REG); advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG); /* Unmask all MSIs */ advk_writel(pcie, 0, PCIE_MSI_MASK_REG); /* Enable summary interrupt for GIC SPI source */ reg = PCIE_IRQ_ALL_MASK & (~PCIE_IRQ_ENABLE_INTS_MASK); advk_writel(pcie, reg, HOST_CTRL_INT_MASK_REG); reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG); reg |= PCIE_CORE_CTRL2_OB_WIN_ENABLE; advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG); /* Bypass the address window mapping for PIO */ reg = advk_readl(pcie, PIO_CTRL); reg |= PIO_CTRL_ADDR_WIN_DISABLE; advk_writel(pcie, reg, PIO_CTRL); /* * PERST# signal could have been asserted by pinctrl subsystem before * probe() callback has been called or issued explicitly by reset gpio * function advk_pcie_issue_perst(), making the endpoint going into * fundamental reset. As required by PCI Express spec a delay for at * least 100ms after such a reset before link training is needed. */ msleep(PCI_PM_D3COLD_WAIT); advk_pcie_train_link(pcie); /* * FIXME: The following register update is suspicious. This register is * applicable only when the PCI controller is configured for Endpoint * mode, not as a Root Complex. But apparently when this code is * removed, some cards stop working. This should be investigated and * a comment explaining this should be put here. */ reg = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG); reg |= PCIE_CORE_CMD_MEM_ACCESS_EN | PCIE_CORE_CMD_IO_ACCESS_EN | PCIE_CORE_CMD_MEM_IO_REQ_EN; advk_writel(pcie, reg, PCIE_CORE_CMD_STATUS_REG); } static void advk_pcie_check_pio_status(struct advk_pcie *pcie) { struct device *dev = &pcie->pdev->dev; u32 reg; unsigned int status; char *strcomp_status, *str_posted; reg = advk_readl(pcie, PIO_STAT); status = (reg & PIO_COMPLETION_STATUS_MASK) >> PIO_COMPLETION_STATUS_SHIFT; if (!status) return; switch (status) { case PIO_COMPLETION_STATUS_UR: strcomp_status = "UR"; break; case PIO_COMPLETION_STATUS_CRS: strcomp_status = "CRS"; break; case PIO_COMPLETION_STATUS_CA: strcomp_status = "CA"; break; default: strcomp_status = "Unknown"; break; } if (reg & PIO_NON_POSTED_REQ) str_posted = "Non-posted"; else str_posted = "Posted"; dev_err(dev, "%s PIO Response Status: %s, %#x @ %#x\n", str_posted, strcomp_status, reg, advk_readl(pcie, PIO_ADDR_LS)); } static int advk_pcie_wait_pio(struct advk_pcie *pcie) { struct device *dev = &pcie->pdev->dev; int i; for (i = 0; i < PIO_RETRY_CNT; i++) { u32 start, isr; start = advk_readl(pcie, PIO_START); isr = advk_readl(pcie, PIO_ISR); if (!start && isr) return 0; udelay(PIO_RETRY_DELAY); } dev_err(dev, "config read/write timed out\n"); return -ETIMEDOUT; } static pci_bridge_emul_read_status_t advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge, int reg, u32 *value) { struct advk_pcie *pcie = bridge->data; switch (reg) { case PCI_EXP_SLTCTL: *value = PCI_EXP_SLTSTA_PDS << 16; return PCI_BRIDGE_EMUL_HANDLED; case PCI_EXP_RTCTL: { u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG); *value = (val & PCIE_MSG_PM_PME_MASK) ? 0 : PCI_EXP_RTCTL_PMEIE; return PCI_BRIDGE_EMUL_HANDLED; } case PCI_EXP_RTSTA: { u32 isr0 = advk_readl(pcie, PCIE_ISR0_REG); u32 msglog = advk_readl(pcie, PCIE_MSG_LOG_REG); *value = (isr0 & PCIE_MSG_PM_PME_MASK) << 16 | (msglog >> 16); return PCI_BRIDGE_EMUL_HANDLED; } case PCI_EXP_LNKCTL: { /* u32 contains both PCI_EXP_LNKCTL and PCI_EXP_LNKSTA */ u32 val = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg) & ~(PCI_EXP_LNKSTA_LT << 16); if (!advk_pcie_link_up(pcie)) val |= (PCI_EXP_LNKSTA_LT << 16); *value = val; return PCI_BRIDGE_EMUL_HANDLED; } case PCI_CAP_LIST_ID: case PCI_EXP_DEVCAP: case PCI_EXP_DEVCTL: case PCI_EXP_LNKCAP: *value = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg); return PCI_BRIDGE_EMUL_HANDLED; default: return PCI_BRIDGE_EMUL_NOT_HANDLED; } } static void advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge, int reg, u32 old, u32 new, u32 mask) { struct advk_pcie *pcie = bridge->data; switch (reg) { case PCI_EXP_DEVCTL: advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg); break; case PCI_EXP_LNKCTL: advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg); if (new & PCI_EXP_LNKCTL_RL) advk_pcie_wait_for_retrain(pcie); break; case PCI_EXP_RTCTL: { /* Only mask/unmask PME interrupt */ u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) & ~PCIE_MSG_PM_PME_MASK; if ((new & PCI_EXP_RTCTL_PMEIE) == 0) val |= PCIE_MSG_PM_PME_MASK; advk_writel(pcie, val, PCIE_ISR0_MASK_REG); break; } case PCI_EXP_RTSTA: new = (new & PCI_EXP_RTSTA_PME) >> 9; advk_writel(pcie, new, PCIE_ISR0_REG); break; default: break; } } static struct pci_bridge_emul_ops advk_pci_bridge_emul_ops = { .read_pcie = advk_pci_bridge_emul_pcie_conf_read, .write_pcie = advk_pci_bridge_emul_pcie_conf_write, }; /* * Initialize the configuration space of the PCI-to-PCI bridge * associated with the given PCIe interface. */ static void advk_sw_pci_bridge_init(struct advk_pcie *pcie) { struct pci_bridge_emul *bridge = &pcie->bridge; bridge->conf.vendor = cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) & 0xffff); bridge->conf.device = cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) >> 16); bridge->conf.class_revision = cpu_to_le32(advk_readl(pcie, PCIE_CORE_DEV_REV_REG) & 0xff); /* Support 32 bits I/O addressing */ bridge->conf.iobase = PCI_IO_RANGE_TYPE_32; bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32; /* Support 64 bits memory pref */ bridge->conf.pref_mem_base = cpu_to_le16(PCI_PREF_RANGE_TYPE_64); bridge->conf.pref_mem_limit = cpu_to_le16(PCI_PREF_RANGE_TYPE_64); /* Support interrupt A for MSI feature */ bridge->conf.intpin = PCIE_CORE_INT_A_ASSERT_ENABLE; bridge->has_pcie = true; bridge->data = pcie; bridge->ops = &advk_pci_bridge_emul_ops; pci_bridge_emul_init(bridge, 0); } static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus, int devfn) { if (pci_is_root_bus(bus) && PCI_SLOT(devfn) != 0) return false; /* * If the link goes down after we check for link-up, nothing bad * happens but the config access times out. */ if (!pci_is_root_bus(bus) && !advk_pcie_link_up(pcie)) return false; return true; } static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 *val) { struct advk_pcie *pcie = bus->sysdata; u32 reg; int ret; if (!advk_pcie_valid_device(pcie, bus, devfn)) { *val = 0xffffffff; return PCIBIOS_DEVICE_NOT_FOUND; } if (pci_is_root_bus(bus)) return pci_bridge_emul_conf_read(&pcie->bridge, where, size, val); /* Start PIO */ advk_writel(pcie, 0, PIO_START); advk_writel(pcie, 1, PIO_ISR); /* Program the control register */ reg = advk_readl(pcie, PIO_CTRL); reg &= ~PIO_CTRL_TYPE_MASK; if (pci_is_root_bus(bus->parent)) reg |= PCIE_CONFIG_RD_TYPE0; else reg |= PCIE_CONFIG_RD_TYPE1; advk_writel(pcie, reg, PIO_CTRL); /* Program the address registers */ reg = PCIE_CONF_ADDR(bus->number, devfn, where); advk_writel(pcie, reg, PIO_ADDR_LS); advk_writel(pcie, 0, PIO_ADDR_MS); /* Program the data strobe */ advk_writel(pcie, 0xf, PIO_WR_DATA_STRB); /* Start the transfer */ advk_writel(pcie, 1, PIO_START); ret = advk_pcie_wait_pio(pcie); if (ret < 0) { *val = 0xffffffff; return PCIBIOS_SET_FAILED; } advk_pcie_check_pio_status(pcie); /* Get the read result */ *val = advk_readl(pcie, PIO_RD_DATA); if (size == 1) *val = (*val >> (8 * (where & 3))) & 0xff; else if (size == 2) *val = (*val >> (8 * (where & 3))) & 0xffff; return PCIBIOS_SUCCESSFUL; } static int advk_pcie_wr_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 val) { struct advk_pcie *pcie = bus->sysdata; u32 reg; u32 data_strobe = 0x0; int offset; int ret; if (!advk_pcie_valid_device(pcie, bus, devfn)) return PCIBIOS_DEVICE_NOT_FOUND; if (pci_is_root_bus(bus)) return pci_bridge_emul_conf_write(&pcie->bridge, where, size, val); if (where % size) return PCIBIOS_SET_FAILED; /* Start PIO */ advk_writel(pcie, 0, PIO_START); advk_writel(pcie, 1, PIO_ISR); /* Program the control register */ reg = advk_readl(pcie, PIO_CTRL); reg &= ~PIO_CTRL_TYPE_MASK; if (pci_is_root_bus(bus->parent)) reg |= PCIE_CONFIG_WR_TYPE0; else reg |= PCIE_CONFIG_WR_TYPE1; advk_writel(pcie, reg, PIO_CTRL); /* Program the address registers */ reg = PCIE_CONF_ADDR(bus->number, devfn, where); advk_writel(pcie, reg, PIO_ADDR_LS); advk_writel(pcie, 0, PIO_ADDR_MS); /* Calculate the write strobe */ offset = where & 0x3; reg = val << (8 * offset); data_strobe = GENMASK(size - 1, 0) << offset; /* Program the data register */ advk_writel(pcie, reg, PIO_WR_DATA); /* Program the data strobe */ advk_writel(pcie, data_strobe, PIO_WR_DATA_STRB); /* Start the transfer */ advk_writel(pcie, 1, PIO_START); ret = advk_pcie_wait_pio(pcie); if (ret < 0) return PCIBIOS_SET_FAILED; advk_pcie_check_pio_status(pcie); return PCIBIOS_SUCCESSFUL; } static struct pci_ops advk_pcie_ops = { .read = advk_pcie_rd_conf, .write = advk_pcie_wr_conf, }; static void advk_msi_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) { struct advk_pcie *pcie = irq_data_get_irq_chip_data(data); phys_addr_t msi_msg = virt_to_phys(&pcie->msi_msg); msg->address_lo = lower_32_bits(msi_msg); msg->address_hi = upper_32_bits(msi_msg); msg->data = data->irq; } static int advk_msi_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { return -EINVAL; } static int advk_msi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *args) { struct advk_pcie *pcie = domain->host_data; int hwirq, i; mutex_lock(&pcie->msi_used_lock); hwirq = bitmap_find_next_zero_area(pcie->msi_used, MSI_IRQ_NUM, 0, nr_irqs, 0); if (hwirq >= MSI_IRQ_NUM) { mutex_unlock(&pcie->msi_used_lock); return -ENOSPC; } bitmap_set(pcie->msi_used, hwirq, nr_irqs); mutex_unlock(&pcie->msi_used_lock); for (i = 0; i < nr_irqs; i++) irq_domain_set_info(domain, virq + i, hwirq + i, &pcie->msi_bottom_irq_chip, domain->host_data, handle_simple_irq, NULL, NULL); return hwirq; } static void advk_msi_irq_domain_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct irq_data *d = irq_domain_get_irq_data(domain, virq); struct advk_pcie *pcie = domain->host_data; mutex_lock(&pcie->msi_used_lock); bitmap_clear(pcie->msi_used, d->hwirq, nr_irqs); mutex_unlock(&pcie->msi_used_lock); } static const struct irq_domain_ops advk_msi_domain_ops = { .alloc = advk_msi_irq_domain_alloc, .free = advk_msi_irq_domain_free, }; static void advk_pcie_irq_mask(struct irq_data *d) { struct advk_pcie *pcie = d->domain->host_data; irq_hw_number_t hwirq = irqd_to_hwirq(d); u32 mask; mask = advk_readl(pcie, PCIE_ISR1_MASK_REG); mask |= PCIE_ISR1_INTX_ASSERT(hwirq); advk_writel(pcie, mask, PCIE_ISR1_MASK_REG); } static void advk_pcie_irq_unmask(struct irq_data *d) { struct advk_pcie *pcie = d->domain->host_data; irq_hw_number_t hwirq = irqd_to_hwirq(d); u32 mask; mask = advk_readl(pcie, PCIE_ISR1_MASK_REG); mask &= ~PCIE_ISR1_INTX_ASSERT(hwirq); advk_writel(pcie, mask, PCIE_ISR1_MASK_REG); } static int advk_pcie_irq_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hwirq) { struct advk_pcie *pcie = h->host_data; advk_pcie_irq_mask(irq_get_irq_data(virq)); irq_set_status_flags(virq, IRQ_LEVEL); irq_set_chip_and_handler(virq, &pcie->irq_chip, handle_level_irq); irq_set_chip_data(virq, pcie); return 0; } static const struct irq_domain_ops advk_pcie_irq_domain_ops = { .map = advk_pcie_irq_map, .xlate = irq_domain_xlate_onecell, }; static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie) { struct device *dev = &pcie->pdev->dev; struct device_node *node = dev->of_node; struct irq_chip *bottom_ic, *msi_ic; struct msi_domain_info *msi_di; phys_addr_t msi_msg_phys; mutex_init(&pcie->msi_used_lock); bottom_ic = &pcie->msi_bottom_irq_chip; bottom_ic->name = "MSI"; bottom_ic->irq_compose_msi_msg = advk_msi_irq_compose_msi_msg; bottom_ic->irq_set_affinity = advk_msi_set_affinity; msi_ic = &pcie->msi_irq_chip; msi_ic->name = "advk-MSI"; msi_di = &pcie->msi_domain_info; msi_di->flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_MULTI_PCI_MSI; msi_di->chip = msi_ic; msi_msg_phys = virt_to_phys(&pcie->msi_msg); advk_writel(pcie, lower_32_bits(msi_msg_phys), PCIE_MSI_ADDR_LOW_REG); advk_writel(pcie, upper_32_bits(msi_msg_phys), PCIE_MSI_ADDR_HIGH_REG); pcie->msi_inner_domain = irq_domain_add_linear(NULL, MSI_IRQ_NUM, &advk_msi_domain_ops, pcie); if (!pcie->msi_inner_domain) return -ENOMEM; pcie->msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(node), msi_di, pcie->msi_inner_domain); if (!pcie->msi_domain) { irq_domain_remove(pcie->msi_inner_domain); return -ENOMEM; } return 0; } static void advk_pcie_remove_msi_irq_domain(struct advk_pcie *pcie) { irq_domain_remove(pcie->msi_domain); irq_domain_remove(pcie->msi_inner_domain); } static int advk_pcie_init_irq_domain(struct advk_pcie *pcie) { struct device *dev = &pcie->pdev->dev; struct device_node *node = dev->of_node; struct device_node *pcie_intc_node; struct irq_chip *irq_chip; int ret = 0; pcie_intc_node = of_get_next_child(node, NULL); if (!pcie_intc_node) { dev_err(dev, "No PCIe Intc node found\n"); return -ENODEV; } irq_chip = &pcie->irq_chip; irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-irq", dev_name(dev)); if (!irq_chip->name) { ret = -ENOMEM; goto out_put_node; } irq_chip->irq_mask = advk_pcie_irq_mask; irq_chip->irq_mask_ack = advk_pcie_irq_mask; irq_chip->irq_unmask = advk_pcie_irq_unmask; pcie->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX, &advk_pcie_irq_domain_ops, pcie); if (!pcie->irq_domain) { dev_err(dev, "Failed to get a INTx IRQ domain\n"); ret = -ENOMEM; goto out_put_node; } out_put_node: of_node_put(pcie_intc_node); return ret; } static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie) { irq_domain_remove(pcie->irq_domain); } static void advk_pcie_handle_msi(struct advk_pcie *pcie) { u32 msi_val, msi_mask, msi_status, msi_idx; u16 msi_data; msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG); msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG); msi_status = msi_val & ~msi_mask; for (msi_idx = 0; msi_idx < MSI_IRQ_NUM; msi_idx++) { if (!(BIT(msi_idx) & msi_status)) continue; advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG); msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & 0xFF; generic_handle_irq(msi_data); } advk_writel(pcie, PCIE_ISR0_MSI_INT_PENDING, PCIE_ISR0_REG); } static void advk_pcie_handle_int(struct advk_pcie *pcie) { u32 isr0_val, isr0_mask, isr0_status; u32 isr1_val, isr1_mask, isr1_status; int i, virq; isr0_val = advk_readl(pcie, PCIE_ISR0_REG); isr0_mask = advk_readl(pcie, PCIE_ISR0_MASK_REG); isr0_status = isr0_val & ((~isr0_mask) & PCIE_ISR0_ALL_MASK); isr1_val = advk_readl(pcie, PCIE_ISR1_REG); isr1_mask = advk_readl(pcie, PCIE_ISR1_MASK_REG); isr1_status = isr1_val & ((~isr1_mask) & PCIE_ISR1_ALL_MASK); if (!isr0_status && !isr1_status) { advk_writel(pcie, isr0_val, PCIE_ISR0_REG); advk_writel(pcie, isr1_val, PCIE_ISR1_REG); return; } /* Process MSI interrupts */ if (isr0_status & PCIE_ISR0_MSI_INT_PENDING) advk_pcie_handle_msi(pcie); /* Process legacy interrupts */ for (i = 0; i < PCI_NUM_INTX; i++) { if (!(isr1_status & PCIE_ISR1_INTX_ASSERT(i))) continue; advk_writel(pcie, PCIE_ISR1_INTX_ASSERT(i), PCIE_ISR1_REG); virq = irq_find_mapping(pcie->irq_domain, i); generic_handle_irq(virq); } } static irqreturn_t advk_pcie_irq_handler(int irq, void *arg) { struct advk_pcie *pcie = arg; u32 status; status = advk_readl(pcie, HOST_CTRL_INT_STATUS_REG); if (!(status & PCIE_IRQ_CORE_INT)) return IRQ_NONE; advk_pcie_handle_int(pcie); /* Clear interrupt */ advk_writel(pcie, PCIE_IRQ_CORE_INT, HOST_CTRL_INT_STATUS_REG); return IRQ_HANDLED; } static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie) { phy_power_off(pcie->phy); phy_exit(pcie->phy); } static int advk_pcie_enable_phy(struct advk_pcie *pcie) { int ret; if (!pcie->phy) return 0; ret = phy_init(pcie->phy); if (ret) return ret; ret = phy_set_mode(pcie->phy, PHY_MODE_PCIE); if (ret) { phy_exit(pcie->phy); return ret; } ret = phy_power_on(pcie->phy); if (ret) { phy_exit(pcie->phy); return ret; } return 0; } static int advk_pcie_setup_phy(struct advk_pcie *pcie) { struct device *dev = &pcie->pdev->dev; struct device_node *node = dev->of_node; int ret = 0; pcie->phy = devm_of_phy_get(dev, node, NULL); if (IS_ERR(pcie->phy) && (PTR_ERR(pcie->phy) == -EPROBE_DEFER)) return PTR_ERR(pcie->phy); /* Old bindings miss the PHY handle */ if (IS_ERR(pcie->phy)) { dev_warn(dev, "PHY unavailable (%ld)\n", PTR_ERR(pcie->phy)); pcie->phy = NULL; return 0; } ret = advk_pcie_enable_phy(pcie); if (ret) dev_err(dev, "Failed to initialize PHY (%d)\n", ret); return ret; } static int advk_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct advk_pcie *pcie; struct pci_host_bridge *bridge; int ret, irq; bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct advk_pcie)); if (!bridge) return -ENOMEM; pcie = pci_host_bridge_priv(bridge); pcie->pdev = pdev; pcie->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(pcie->base)) return PTR_ERR(pcie->base); irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; ret = devm_request_irq(dev, irq, advk_pcie_irq_handler, IRQF_SHARED | IRQF_NO_THREAD, "advk-pcie", pcie); if (ret) { dev_err(dev, "Failed to register interrupt\n"); return ret; } pcie->reset_gpio = devm_gpiod_get_from_of_node(dev, dev->of_node, "reset-gpios", 0, GPIOD_OUT_LOW, "pcie1-reset"); ret = PTR_ERR_OR_ZERO(pcie->reset_gpio); if (ret) { if (ret == -ENOENT) { pcie->reset_gpio = NULL; } else { if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get reset-gpio: %i\n", ret); return ret; } } ret = of_pci_get_max_link_speed(dev->of_node); if (ret <= 0 || ret > 3) pcie->link_gen = 3; else pcie->link_gen = ret; ret = advk_pcie_setup_phy(pcie); if (ret) return ret; advk_pcie_setup_hw(pcie); advk_sw_pci_bridge_init(pcie); ret = advk_pcie_init_irq_domain(pcie); if (ret) { dev_err(dev, "Failed to initialize irq\n"); return ret; } ret = advk_pcie_init_msi_irq_domain(pcie); if (ret) { dev_err(dev, "Failed to initialize irq\n"); advk_pcie_remove_irq_domain(pcie); return ret; } bridge->sysdata = pcie; bridge->ops = &advk_pcie_ops; ret = pci_host_probe(bridge); if (ret < 0) { advk_pcie_remove_msi_irq_domain(pcie); advk_pcie_remove_irq_domain(pcie); return ret; } return 0; } static const struct of_device_id advk_pcie_of_match_table[] = { { .compatible = "marvell,armada-3700-pcie", }, {}, }; static struct platform_driver advk_pcie_driver = { .driver = { .name = "advk-pcie", .of_match_table = advk_pcie_of_match_table, /* Driver unloading/unbinding currently not supported */ .suppress_bind_attrs = true, }, .probe = advk_pcie_probe, }; builtin_platform_driver(advk_pcie_driver);
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