linux/drivers/pci/host/pci-keystone-dw.c

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/*
* Designware application register space functions for Keystone PCI controller
*
* Copyright (C) 2013-2014 Texas Instruments., Ltd.
* http://www.ti.com
*
* Author: Murali Karicheri <m-karicheri2@ti.com>
*
*
* 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.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include "pcie-designware.h"
#include "pci-keystone.h"
/* Application register defines */
#define LTSSM_EN_VAL 1
#define LTSSM_STATE_MASK 0x1f
#define LTSSM_STATE_L0 0x11
#define DBI_CS2_EN_VAL 0x20
#define OB_XLAT_EN_VAL 2
/* 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))
/* IRQ register defines */
#define IRQ_EOI 0x050
#define IRQ_STATUS 0x184
#define IRQ_ENABLE_SET 0x188
#define IRQ_ENABLE_CLR 0x18c
#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 MSI_IRQ_OFFSET 4
/* Config space registers */
#define DEBUG0 0x728
#define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp)
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;
}
u32 ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
{
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
return ks_pcie->app.start + MSI_IRQ;
}
void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
{
struct pcie_port *pp = &ks_pcie->pp;
u32 pending, vector;
int src, virq;
pending = readl(ks_pcie->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 ks_dw_pcie_msi_irq_ack(struct irq_data *d)
{
u32 offset, reg_offset, bit_pos;
struct keystone_pcie *ks_pcie;
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);
ks_pcie = to_keystone_pcie(pp);
offset = irq - irq_linear_revmap(pp->irq_domain, 0);
update_reg_offset_bit_pos(offset, &reg_offset, &bit_pos);
writel(BIT(bit_pos),
ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4));
writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
}
void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
{
u32 reg_offset, bit_pos;
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
writel(BIT(bit_pos),
ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4));
}
void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
{
u32 reg_offset, bit_pos;
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
writel(BIT(bit_pos),
ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4));
}
static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
{
struct keystone_pcie *ks_pcie;
unsigned int irq = d->irq;
struct msi_desc *msi;
struct pcie_port *pp;
u32 offset;
msi = irq_get_msi_desc(irq);
pp = sys_to_pcie(msi->dev->bus->sysdata);
ks_pcie = to_keystone_pcie(pp);
offset = irq - irq_linear_revmap(pp->irq_domain, 0);
/* Mask the end point if PVM implemented */
if (IS_ENABLED(CONFIG_PCI_MSI)) {
if (msi->msi_attrib.maskbit)
pci_msi_mask_irq(d);
}
ks_dw_pcie_msi_clear_irq(pp, offset);
}
static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
{
struct keystone_pcie *ks_pcie;
unsigned int irq = d->irq;
struct msi_desc *msi;
struct pcie_port *pp;
u32 offset;
msi = irq_get_msi_desc(irq);
pp = sys_to_pcie(msi->dev->bus->sysdata);
ks_pcie = to_keystone_pcie(pp);
offset = irq - irq_linear_revmap(pp->irq_domain, 0);
/* Mask the end point if PVM implemented */
if (IS_ENABLED(CONFIG_PCI_MSI)) {
if (msi->msi_attrib.maskbit)
pci_msi_unmask_irq(d);
}
ks_dw_pcie_msi_set_irq(pp, offset);
}
static struct irq_chip ks_dw_pcie_msi_irq_chip = {
.name = "Keystone-PCIe-MSI-IRQ",
.irq_ack = ks_dw_pcie_msi_irq_ack,
.irq_mask = ks_dw_pcie_msi_irq_mask,
.irq_unmask = ks_dw_pcie_msi_irq_unmask,
};
static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_and_handler(irq, &ks_dw_pcie_msi_irq_chip,
handle_level_irq);
irq_set_chip_data(irq, domain->host_data);
set_irq_flags(irq, IRQF_VALID);
return 0;
}
static const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
.map = ks_dw_pcie_msi_map,
};
int ks_dw_pcie_msi_host_init(struct pcie_port *pp, struct msi_controller *chip)
{
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
int i;
pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
MAX_MSI_IRQS,
&ks_dw_pcie_msi_domain_ops,
chip);
if (!pp->irq_domain) {
dev_err(pp->dev, "irq domain init failed\n");
return -ENXIO;
}
for (i = 0; i < MAX_MSI_IRQS; i++)
irq_create_mapping(pp->irq_domain, i);
return 0;
}
void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
{
int i;
for (i = 0; i < MAX_LEGACY_IRQS; i++)
writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i << 4));
}
void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
{
struct pcie_port *pp = &ks_pcie->pp;
u32 pending;
int virq;
pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset << 4));
if (BIT(0) & pending) {
virq = irq_linear_revmap(ks_pcie->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, ks_pcie->va_app_base + IRQ_EOI);
}
static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
{
}
static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
{
}
static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
{
}
static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
.name = "Keystone-PCI-Legacy-IRQ",
.irq_ack = ks_dw_pcie_ack_legacy_irq,
.irq_mask = ks_dw_pcie_mask_legacy_irq,
.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
};
static int ks_dw_pcie_init_legacy_irq_map(struct irq_domain *d,
unsigned int irq, irq_hw_number_t hw_irq)
{
irq_set_chip_and_handler(irq, &ks_dw_pcie_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 ks_dw_pcie_legacy_irq_domain_ops = {
.map = ks_dw_pcie_init_legacy_irq_map,
.xlate = irq_domain_xlate_onetwocell,
};
/**
* ks_dw_pcie_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 void ks_dw_pcie_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));
}
/**
* ks_dw_pcie_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 void ks_dw_pcie_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 ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
{
struct pcie_port *pp = &ks_pcie->pp;
u32 start = pp->mem.start, end = pp->mem.end;
int i, tr_size;
/* Disable BARs for inbound access */
ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
/* Set outbound translation size per window division */
writel(CFG_PCIM_WIN_SZ_IDX & 0x7, ks_pcie->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, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
start += tr_size;
}
/* Enable OB translation */
writel(OB_XLAT_EN_VAL | readl(ks_pcie->va_app_base + CMD_STATUS),
ks_pcie->va_app_base + CMD_STATUS);
}
/**
* ks_pcie_cfg_setup() - Set up configuration space address for a device
*
* @ks_pcie: ptr to keystone_pcie structure
* @bus: Bus number the device is residing on
* @devfn: device, function number info
*
* 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 void __iomem *ks_pcie_cfg_setup(struct keystone_pcie *ks_pcie, u8 bus,
unsigned int devfn)
{
u8 device = PCI_SLOT(devfn), function = PCI_FUNC(devfn);
struct pcie_port *pp = &ks_pcie->pp;
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, ks_pcie->va_app_base + CFG_SETUP);
return pp->va_cfg0_base;
}
int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
unsigned int devfn, int where, int size, u32 *val)
{
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
u8 bus_num = bus->number;
void __iomem *addr;
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
return dw_pcie_cfg_read(addr + (where & ~0x3), where, size, val);
}
int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
unsigned int devfn, int where, int size, u32 val)
{
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
u8 bus_num = bus->number;
void __iomem *addr;
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
return dw_pcie_cfg_write(addr + (where & ~0x3), where, size, val);
}
/**
* ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
*
* This sets BAR0 to enable inbound access for MSI_IRQ register
*/
void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
{
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
/* Configure and set up BAR0 */
ks_dw_pcie_set_dbi_mode(ks_pcie->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);
ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
/*
* For BAR0, just setting bus address for inbound writes (MSI) should
* be sufficient. Use physical address to avoid any conflicts.
*/
writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
}
/**
* ks_dw_pcie_link_up() - Check if link up
*/
int ks_dw_pcie_link_up(struct pcie_port *pp)
{
u32 val = readl(pp->dbi_base + DEBUG0);
return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
}
void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
{
u32 val;
/* Disable Link training */
val = readl(ks_pcie->va_app_base + CMD_STATUS);
val &= ~LTSSM_EN_VAL;
writel(LTSSM_EN_VAL | val, ks_pcie->va_app_base + CMD_STATUS);
/* Initiate Link Training */
val = readl(ks_pcie->va_app_base + CMD_STATUS);
writel(LTSSM_EN_VAL | val, ks_pcie->va_app_base + CMD_STATUS);
}
/**
* ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
*
* Ioremap the register resources, initialize legacy irq domain
* and call dw_pcie_v3_65_host_init() API to initialize the Keystone
* PCI host controller.
*/
int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
struct device_node *msi_intc_np)
{
struct pcie_port *pp = &ks_pcie->pp;
struct platform_device *pdev = to_platform_device(pp->dev);
struct resource *res;
/* Index 0 is the config reg. space address */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pp->dbi_base = devm_ioremap_resource(pp->dev, res);
if (IS_ERR(pp->dbi_base))
return PTR_ERR(pp->dbi_base);
/*
* We set these same and is used in pcie rd/wr_other_conf
* functions
*/
pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
pp->va_cfg1_base = pp->va_cfg0_base;
/* Index 1 is the application reg. space address */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
ks_pcie->app = *res;
ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
if (IS_ERR(ks_pcie->va_app_base))
return PTR_ERR(ks_pcie->va_app_base);
/* Create legacy IRQ domain */
ks_pcie->legacy_irq_domain =
irq_domain_add_linear(ks_pcie->legacy_intc_np,
MAX_LEGACY_IRQS,
&ks_dw_pcie_legacy_irq_domain_ops,
NULL);
if (!ks_pcie->legacy_irq_domain) {
dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
return -EINVAL;
}
return dw_pcie_host_init(pp);
}