The older version of DW hw has application space registers for MSI controller and inbound/outbound access configuration. Also the legacy interrupt has registers in the application space. Drivers such as keystone pci uses these common functions to implement the driver. These are re-factored from the original driver to separate files to allow re-use for the next driver that is based on old dw pci hw such as that found on keystone. CC: Santosh Shilimkar <santosh.shilimkar@xxxxxx> CC: Mohit Kumar <mohit.kumar@xxxxxx> CC: Jingoo Han <jg1.han@xxxxxxxxxxx> CC: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx> --- drivers/pci/host/Kconfig | 6 +- drivers/pci/host/Makefile | 1 + drivers/pci/host/pci-dw-old-msi.c | 150 +++++++++++++++ drivers/pci/host/pci-dw-old.c | 371 +++++++++++++++++++++++++++++++++++++ drivers/pci/host/pci-dw-old.h | 30 +++ 5 files changed, 557 insertions(+), 1 deletion(-) create mode 100644 drivers/pci/host/pci-dw-old-msi.c create mode 100644 drivers/pci/host/pci-dw-old.c create mode 100644 drivers/pci/host/pci-dw-old.h diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index a6f67ec..c4f4732 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -9,6 +9,11 @@ config PCI_MVEBU config PCIE_DW bool +config PCI_DW_OLD + bool "Designware Old PCIe h/w" + help + Say Y here if the DW h/w is old version (3.65) + config PCI_EXYNOS bool "Samsung Exynos PCIe controller" depends on SOC_EXYNOS5440 @@ -32,5 +37,4 @@ config PCI_RCAR_GEN2 Say Y here if you want internal PCI support on R-Car Gen2 SoC. There are 3 internal PCI controllers available with a single built-in EHCI/OHCI host controller present on each one. - endmenu diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index 13fb333..be5d939 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o +obj-$(CONFIG_PCI_DW_OLD) += pci-dw-old-msi.o pci-dw-old.o diff --git a/drivers/pci/host/pci-dw-old-msi.c b/drivers/pci/host/pci-dw-old-msi.c new file mode 100644 index 0000000..450bb2f --- /dev/null +++ b/drivers/pci/host/pci-dw-old-msi.c @@ -0,0 +1,150 @@ +/* + * Designware(dw) old MSI controller (v3.65 or similar) + * + * Copyright (C) 2013-2014 Texas Instruments., Ltd. + * http://www.ti.com + * + * Author: Murali Karicheri <m-karicheri2@xxxxxx> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/of_irq.h> +#include <linux/kernel.h> +#include <linux/msi.h> +#include <linux/pci.h> + +#include "pcie-designware.h" +#include "pci-dw-old.h" + +#define MSI_IRQ 0x054 +#define MSI0_IRQ_STATUS 0x104 +#define MSI0_IRQ_ENABLE_SET 0x108 +#define MSI0_IRQ_ENABLE_CLR 0x10c +#define IRQ_STATUS 0x184 +#define IRQ_EOI 0x050 +#define MSI_IRQ_OFFSET 4 + +static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys) +{ + return sys->private_data; +} + +static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset, + u32 *bit_pos) +{ + *reg_offset = offset % 8; + *bit_pos = offset >> 3; +} + +inline u32 dw_old_get_msi_data(struct pcie_port *pp) +{ + return pp->app_base + MSI_IRQ; +} + +void dw_old_handle_msi_irq(struct pcie_port *pp, int offset) +{ + u32 pending, vector; + int src, virq; + + pending = readl(pp->va_app_base + MSI0_IRQ_STATUS + (offset << 4)); + /* + * MSI0, Status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit + * shows 1, 9, 17, 25 and so forth + */ + for (src = 0; src < 4; src++) { + if (BIT(src) & pending) { + vector = offset + (src << 3); + virq = irq_linear_revmap(pp->irq_domain, vector); + dev_dbg(pp->dev, + "irq: bit %d, vector %d, virq %d\n", + src, vector, virq); + generic_handle_irq(virq); + } + } +} + +static void dw_old_msi_irq_ack(struct irq_data *d) +{ + u32 offset, reg_offset, bit_pos; + unsigned int irq = d->irq; + struct msi_desc *msi; + struct pcie_port *pp; + + msi = irq_get_msi_desc(irq); + pp = sys_to_pcie(msi->dev->bus->sysdata); + offset = irq - irq_linear_revmap(pp->irq_domain, 0); + update_reg_offset_bit_pos(offset, ®_offset, &bit_pos); + + writel(BIT(bit_pos), + pp->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4)); + writel(reg_offset + MSI_IRQ_OFFSET, pp->va_app_base + IRQ_EOI); +} + +static void dw_old_msi_irq_mask(struct irq_data *d) +{ + u32 offset, reg_offset, bit_pos; + unsigned int irq = d->irq; + struct msi_desc *msi; + struct pcie_port *pp; + + msi = irq_get_msi_desc(irq); + pp = sys_to_pcie(msi->dev->bus->sysdata); + offset = irq - irq_linear_revmap(pp->irq_domain, 0); + update_reg_offset_bit_pos(offset, ®_offset, &bit_pos); + + /* mask the end point if PVM implemented */ + if (IS_ENABLED(CONFIG_PCI_MSI)) { + if (msi->msi_attrib.maskbit) + mask_msi_irq(d); + } + + writel(BIT(bit_pos), + pp->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4)); +} + +static void dw_old_msi_irq_unmask(struct irq_data *d) +{ + u32 offset, reg_offset, bit_pos; + unsigned int irq = d->irq; + struct msi_desc *msi; + struct pcie_port *pp; + + msi = irq_get_msi_desc(irq); + pp = sys_to_pcie(msi->dev->bus->sysdata); + offset = irq - irq_linear_revmap(pp->irq_domain, 0); + update_reg_offset_bit_pos(offset, ®_offset, &bit_pos); + + /* mask the end point if PVM implemented */ + if (IS_ENABLED(CONFIG_PCI_MSI)) { + if (msi->msi_attrib.maskbit) + unmask_msi_irq(d); + } + + writel(BIT(bit_pos), + pp->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4)); +} + +static struct irq_chip dw_old_msi_chip = { + .name = "PCI-DW-MSI-OLD", + .irq_ack = dw_old_msi_irq_ack, + .irq_mask = dw_old_msi_irq_mask, + .irq_unmask = dw_old_msi_irq_unmask, +}; + +static int dw_old_msi_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &dw_old_msi_chip, handle_level_irq); + irq_set_chip_data(irq, domain->host_data); + set_irq_flags(irq, IRQF_VALID); + + return 0; +} + +const struct irq_domain_ops dw_old_msi_domain_ops = { + .map = dw_old_msi_map, +}; diff --git a/drivers/pci/host/pci-dw-old.c b/drivers/pci/host/pci-dw-old.c new file mode 100644 index 0000000..b805013 --- /dev/null +++ b/drivers/pci/host/pci-dw-old.c @@ -0,0 +1,371 @@ +/* + * Designware(dw) old common functions (v3.65 or similar) + * + * Copyright (C) 2013-2014 Texas Instruments., Ltd. + * http://www.ti.com + * + * Author: Murali Karicheri <m-karicheri2@xxxxxx> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/of_pci.h> +#include <linux/pci.h> + +#include "pcie-designware.h" +#include "pci-dw-old.h" + +/* Application register defines */ +#define LTSSM_EN_VAL BIT(0) +#define LTSSM_STATE_MASK 0x1f +#define LTSSM_STATE_L0 0x11 +#define DIR_SPD (1 << 17) +#define DBI_CS2_EN_VAL BIT(5) +#define OB_XLAT_EN_VAL BIT(1) + +/* Application registers */ +#define CMD_STATUS 0x004 +#define CFG_SETUP 0x008 +#define OB_SIZE 0x030 +#define CFG_PCIM_WIN_SZ_IDX 3 +#define CFG_PCIM_WIN_CNT 32 +#define SPACE0_REMOTE_CFG_OFFSET 0x1000 +#define OB_OFFSET_INDEX(n) (0x200 + (8 * n)) +#define OB_OFFSET_HI(n) (0x204 + (8 * n)) +#define IRQ_EOI 0x050 +#define IRQ_STATUS 0x184 +#define IRQ_ENABLE_SET 0x188 +#define IRQ_ENABLE_CLR 0x18c + +/* Config space registers */ +#define DEBUG0 0x728 +#define PL_GEN2 0x80c + +static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys) +{ + return sys->private_data; +} + +void dw_old_enable_legacy_irqs(struct pcie_port *pp) +{ + int i; + + for (i = 0; i < MAX_LEGACY_IRQS; i++) + writel(0x1, pp->va_app_base + IRQ_ENABLE_SET + (i << 4)); +} + +void dw_old_handle_legacy_irq(struct pcie_port *pp, int offset) +{ + u32 pending; + int virq; + + pending = readl(pp->va_app_base + IRQ_STATUS + (offset << 4)); + + if (BIT(0) & pending) { + virq = irq_linear_revmap(pp->legacy_irq_domain, offset); + dev_dbg(pp->dev, + ": irq: irq_offset %d, virq %d\n", offset, virq); + generic_handle_irq(virq); + } + + /* EOI the INTx interrupt */ + writel(offset, pp->va_app_base + IRQ_EOI); +} + +static void dw_old_ack_irq(struct irq_data *d) +{ +} + +static void dw_old_mask_irq(struct irq_data *d) +{ +} + +static void dw_old_unmask_irq(struct irq_data *d) +{ +} + +struct irq_chip dw_old_legacy_irq_chip = { + .name = "PCI-DW-LEGACY-old-irq", + .irq_ack = dw_old_ack_irq, + .irq_mask = dw_old_mask_irq, + .irq_unmask = dw_old_unmask_irq, +}; + +static int dw_old_init_legacy_irq_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + irq_set_chip_and_handler(irq, &dw_old_legacy_irq_chip, + handle_level_irq); + irq_set_chip_data(irq, d->host_data); + set_irq_flags(irq, IRQF_VALID); + + return 0; +} + +static const struct irq_domain_ops dw_old_legacy_irq_domian_ops = { + .map = dw_old_init_legacy_irq_map, + .xlate = irq_domain_xlate_onetwocell, +}; + +/** + * dw_old_set_outbound_trans() - Set PHYADDR <-> BUSADDR + * mapping for outbound + */ +void dw_old_setup_ob_regs(struct pcie_port *pp) +{ + u32 start = pp->mem.start, end = pp->mem.end; + int i, tr_size; + + dev_dbg(pp->dev, "Setting outbound translation for %#x-%#x\n", + start, end); + + /* Set outbound translation size per window division */ + writel(CFG_PCIM_WIN_SZ_IDX & 0x7, pp->va_app_base + OB_SIZE); + + tr_size = (1 << (CFG_PCIM_WIN_SZ_IDX & 0x7)) * SZ_1M; + + /* Using Direct 1:1 mapping of RC <-> PCI memory space */ + for (i = 0; (i < CFG_PCIM_WIN_CNT) && (start < end); i++) { + writel(start | 1, pp->va_app_base + OB_OFFSET_INDEX(i)); + writel(0, pp->va_app_base + OB_OFFSET_HI(i)); + start += tr_size; + } + + /* Enable OB translation */ + writel(OB_XLAT_EN_VAL | readl(pp->va_app_base + CMD_STATUS), + pp->va_app_base + CMD_STATUS); +} + +/** + * dw_old_set_dbi_mode() - Set DBI mode to access overlaid BAR mask registers + * + * Since modification of dbi_cs2 involves different clock domain, read the + * status back to ensure the transition is complete. + */ +static inline void dw_old_set_dbi_mode(void __iomem *reg_virt) +{ + u32 val; + + writel(DBI_CS2_EN_VAL | readl(reg_virt + CMD_STATUS), + reg_virt + CMD_STATUS); + + do { + val = readl(reg_virt + CMD_STATUS); + } while (!(val & DBI_CS2_EN_VAL)); +} + +/** + * dw_old_clear_dbi_mode() - Disable DBI mode + * + * Since modification of dbi_cs2 involves different clock domain, read the + * status back to ensure the transition is complete. + */ +static inline void dw_old_clear_dbi_mode(void __iomem *reg_virt) +{ + u32 val; + + writel(~DBI_CS2_EN_VAL & readl(reg_virt + CMD_STATUS), + reg_virt + CMD_STATUS); + + do { + val = readl(reg_virt + CMD_STATUS); + } while (val & DBI_CS2_EN_VAL); +} + +void dw_old_disable_bars(struct pcie_port *pp) +{ + dw_old_set_dbi_mode(pp->va_app_base); + writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0); + writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1); + dw_old_clear_dbi_mode(pp->va_app_base); +} + +/** + * dw_old_setup_config_addr() - Set up configuration space address for a + * device + * + * @pp: ptr to pcie_port structure + * @bus: Bus number the device is residing on + * @device: Device number + * @function: Function number in device + * + * Forms and returns the address of configuration space mapped in PCIESS + * address space 0. Also configures CFG_SETUP for remote configuration space + * access. + * + * The address space has two regions to access configuration - local and remote. + * We access local region for bus 0 (as RC is attached on bus 0) and remote + * region for others with TYPE 1 access when bus > 1. As for device on bus = 1, + * we will do TYPE 0 access as it will be on our secondary bus (logical). + * CFG_SETUP is needed only for remote configuration access. + */ +static inline void __iomem * +dw_old_setup_config_addr(struct pcie_port *pp, u8 bus, u8 device, u8 function) +{ + u32 regval; + + if (bus == 0) + return pp->dbi_base; + + regval = (bus << 16) | (device << 8) | function; + /* + * Since Bus#1 will be a virtual bus, we need to have TYPE0 + * access only. + * TYPE 1 + */ + if (bus != 1) + regval |= BIT(24); + + writel(regval, pp->va_app_base + CFG_SETUP); + + return pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET; +} + +int dw_old_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus, + unsigned int devfn, int where, int size, u32 *val) +{ + u8 bus_num = bus->number; + void __iomem *addr; + int ret; + + addr = dw_old_setup_config_addr(pp, bus_num, PCI_SLOT(devfn), + PCI_FUNC(devfn)); + + ret = dw_pcie_cfg_read(addr + (where & ~0x3), where, size, val); + + return ret; +} + +int dw_old_wr_other_conf(struct pcie_port *pp, + struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 val) +{ + u8 bus_num = bus->number; + void __iomem *addr; + + addr = dw_old_setup_config_addr(pp, bus_num, PCI_SLOT(devfn), + PCI_FUNC(devfn)); + return dw_pcie_cfg_write(addr + (where & ~0x3), where, size, val); +} + +/** + * dw_old_set_ib_access() - Setup inbound access + * + * Configure BAR0 for inbound access. BAR0 is set up in h/w to have + * access to PCIESS application register space and just needs to set up + * inbound address (mainly used for MSI). + */ +static void dw_old_set_ib_access(struct pcie_port *pp) +{ + /* Configure and set up BAR0 */ + dw_old_set_dbi_mode(pp->va_app_base); + + /* Enable BAR0 */ + writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0); + writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0); + + dw_old_clear_dbi_mode(pp->va_app_base); + /* + * For BAR0, just setting bus address for inbound writes (MSI) should + * be sufficient. Use physical address to avoid any conflicts. + */ + writel(pp->app_base, pp->dbi_base + PCI_BASE_ADDRESS_0); +} + +/** + * dw_old_pcie_scan_bus() - common function to scan bus + * + * common functin to scan old dw based pci bus. This also sets inbound access + * after scan. + */ +static struct pci_bus *dw_old_pcie_scan_bus(int nr, struct pci_sys_data *sys) +{ + struct pcie_port *pp = sys_to_pcie(sys); + struct pci_bus *bus; + + bus = dw_pcie_scan_bus(nr, sys); + if (bus) + dw_old_set_ib_access(pp); + + return bus; +} + +/** + * dw_old_pcie_link_up() - Check if link up + * + * optionally enable link train using link_train option and check if link is up. + */ +int dw_old_pcie_link_up(struct pcie_port *pp, int link_train) +{ + u32 val; + + if (link_train) { + /* + * KeyStone devices do not support h/w autonomous + * link up-training to GEN2 from GEN1 in either EP/RC modes. + * The software needs to initiate speed change. + */ + val = readl(pp->dbi_base + PL_GEN2); + writel(val | DIR_SPD, pp->dbi_base + PL_GEN2); + /* + * Initiate Link Training. We will delay for L0 as specified by + * standard, but will still proceed and return success + * irrespective of L0 status as this will be handled by explicit + * L0 state checks during enumeration. + */ + val = readl(pp->va_app_base + CMD_STATUS); + writel(LTSSM_EN_VAL | val, pp->va_app_base + CMD_STATUS); + + } + + val = readl(pp->dbi_base + DEBUG0); + + return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0; +} + +static struct hw_pci dw_old_pcie_hw = { + .nr_controllers = 1, + .setup = dw_pcie_setup, + .scan = dw_old_pcie_scan_bus, + .swizzle = pci_common_swizzle, + .add_bus = dw_pcie_add_bus, + .map_irq = of_irq_parse_and_map_pci, +}; + + +/** + * dw_old_pcie_host_init() - initialize host for old dw hardware + * + * Parse the pcie resources from DT bindings and then call common + * dw function to do host initialization. + */ +int __init dw_old_pcie_host_init(struct pcie_port *pp, struct device_node *np) +{ + int ret; + + if (!pp->va_app_base) + return -EINVAL; + + /* create legacy domain */ + pp->legacy_irq_domain = irq_domain_add_linear(np, + MAX_LEGACY_IRQS, + &dw_old_legacy_irq_domian_ops, NULL); + + if (!pp->legacy_irq_domain) { + dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n"); + return -EINVAL; + } + + ret = dw_pcie_parse_resource(pp); + if (ret) + return ret; + + return dw_pcie_common_host_init(pp, &dw_old_pcie_hw, + &dw_old_msi_domain_ops); +} diff --git a/drivers/pci/host/pci-dw-old.h b/drivers/pci/host/pci-dw-old.h new file mode 100644 index 0000000..6e1af50 --- /dev/null +++ b/drivers/pci/host/pci-dw-old.h @@ -0,0 +1,30 @@ +/* + * Designware(dw) old MSI controller (v3.65 or similar) common includes + * + * Copyright (C) 2013-2014 Texas Instruments., Ltd. + * http://www.ti.com + * + * Author: Murali Karicheri <m-karicheri2@xxxxxx> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define MAX_LEGACY_IRQS 4 + +extern const struct irq_domain_ops dw_old_msi_domain_ops; + +void dw_old_handle_msi_irq(struct pcie_port *pp, int offset); +u32 dw_old_get_msi_data(struct pcie_port *pp); +void dw_old_enable_legacy_irqs(struct pcie_port *pp); +void dw_old_handle_legacy_irq(struct pcie_port *pp, int offset); +int dw_old_pcie_host_init(struct pcie_port *pp, struct device_node *np); +int dw_old_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus, + unsigned int devfn, int where, int size, u32 val); +int dw_old_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus, + unsigned int devfn, int where, int size, u32 *val); +void dw_old_disable_bars(struct pcie_port *pp); +void dw_old_setup_ob_regs(struct pcie_port *pp); +int dw_old_pcie_link_up(struct pcie_port *pp, int link_train); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
