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PCI: keystone: Merge pci-keystone-dw.c and pci-keystone.c 

No functional change. Having two different files for keystone PCI driver
doesn't serve any purpose. Merge pci-keystone-dw.c and pci-keystone.c
into a single pci-keystone.c file and remove pci-keystone.h.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Kishon Vijay Abraham I 2018-10-17 13:10:59 +05:30 committed by Lorenzo Pieralisi
parent 1f79f98f05
commit b492aca35c
5 changed files with 490 additions and 542 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAINTAINERS
View File

@ -11189,7 +11189,7 @@ M: Murali Karicheri <m-karicheri2@ti.com>
L: linux-pci@vger.kernel.org
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
F: drivers/pci/controller/dwc/*keystone*
F: drivers/pci/controller/dwc/pci-keystone.c
PCI ENDPOINT SUBSYSTEM
M: Kishon Vijay Abraham I <kishon@ti.com>

2
drivers/pci/controller/dwc/Makefile
View File

@ -7,7 +7,7 @@ obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone.o
obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o

483
drivers/pci/controller/dwc/pci-keystone-dw.c
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@ -1,483 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* 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>
*/
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/irqreturn.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
/* Error IRQ bits */
#define ERR_AER BIT(5) /* ECRC error */
#define ERR_AXI BIT(4) /* AXI tag lookup fatal error */
#define ERR_CORR BIT(3) /* Correctable error */
#define ERR_NONFATAL BIT(2) /* Non-fatal error */
#define ERR_FATAL BIT(1) /* Fatal error */
#define ERR_SYS BIT(0) /* System (fatal, non-fatal, or correctable) */
#define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \
ERR_NONFATAL | ERR_FATAL | ERR_SYS)
#define ERR_FATAL_IRQ (ERR_FATAL | ERR_AXI)
#define ERR_IRQ_STATUS_RAW 0x1c0
#define ERR_IRQ_STATUS 0x1c4
#define ERR_IRQ_ENABLE_SET 0x1c8
#define ERR_IRQ_ENABLE_CLR 0x1cc
/* Config space registers */
#define DEBUG0 0x728
#define to_keystone_pcie(x) dev_get_drvdata((x)->dev)
static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
u32 *bit_pos)
{
*reg_offset = offset % 8;
*bit_pos = offset >> 3;
}
phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
return ks_pcie->app.start + MSI_IRQ;
}
static u32 ks_dw_app_readl(struct keystone_pcie *ks_pcie, u32 offset)
{
return readl(ks_pcie->va_app_base + offset);
}
static void ks_dw_app_writel(struct keystone_pcie *ks_pcie, u32 offset, u32 val)
{
writel(val, ks_pcie->va_app_base + offset);
}
void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
{
struct dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = pci->dev;
u32 pending, vector;
int src, virq;
pending = ks_dw_app_readl(ks_pcie, 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(dev, "irq: bit %d, vector %d, virq %d\n",
src, vector, virq);
generic_handle_irq(virq);
}
}
}
void ks_dw_pcie_msi_irq_ack(int irq, struct pcie_port *pp)
{
u32 reg_offset, bit_pos;
struct keystone_pcie *ks_pcie;
struct dw_pcie *pci;
pci = to_dw_pcie_from_pp(pp);
ks_pcie = to_keystone_pcie(pci);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
ks_dw_app_writel(ks_pcie, MSI0_IRQ_STATUS + (reg_offset << 4),
BIT(bit_pos));
ks_dw_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET);
}
void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
{
u32 reg_offset, bit_pos;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
ks_dw_app_writel(ks_pcie, MSI0_IRQ_ENABLE_SET + (reg_offset << 4),
BIT(bit_pos));
}
void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
{
u32 reg_offset, bit_pos;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
ks_dw_app_writel(ks_pcie, MSI0_IRQ_ENABLE_CLR + (reg_offset << 4),
BIT(bit_pos));
}
int ks_dw_pcie_msi_host_init(struct pcie_port *pp)
{
return dw_pcie_allocate_domains(pp);
}
void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
{
int i;
for (i = 0; i < PCI_NUM_INTX; i++)
ks_dw_app_writel(ks_pcie, IRQ_ENABLE_SET + (i << 4), 0x1);
}
void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
{
struct dw_pcie *pci = ks_pcie->pci;
struct device *dev = pci->dev;
u32 pending;
int virq;
pending = ks_dw_app_readl(ks_pcie, IRQ_STATUS + (offset << 4));
if (BIT(0) & pending) {
virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq);
generic_handle_irq(virq);
}
/* EOI the INTx interrupt */
ks_dw_app_writel(ks_pcie, IRQ_EOI, offset);
}
void ks_dw_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
{
ks_dw_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
}
irqreturn_t ks_dw_pcie_handle_error_irq(struct keystone_pcie *ks_pcie)
{
u32 status;
status = ks_dw_app_readl(ks_pcie, ERR_IRQ_STATUS_RAW) & ERR_IRQ_ALL;
if (!status)
return IRQ_NONE;
if (status & ERR_FATAL_IRQ)
dev_err(ks_pcie->pci->dev, "fatal error (status %#010x)\n",
status);
/* Ack the IRQ; status bits are RW1C */
ks_dw_app_writel(ks_pcie, ERR_IRQ_STATUS, status);
return IRQ_HANDLED;
}
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);
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(struct keystone_pcie *ks_pcie)
{
u32 val;
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, DBI_CS2_EN_VAL | val);
do {
val = ks_dw_app_readl(ks_pcie, 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(struct keystone_pcie *ks_pcie)
{
u32 val;
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, ~DBI_CS2_EN_VAL & val);
do {
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
} while (val & DBI_CS2_EN_VAL);
}
void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
{
struct dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
u32 start = pp->mem->start, end = pp->mem->end;
int i, tr_size;
u32 val;
/* Disable BARs for inbound access */
ks_dw_pcie_set_dbi_mode(ks_pcie);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
ks_dw_pcie_clear_dbi_mode(ks_pcie);
/* Set outbound translation size per window division */
ks_dw_app_writel(ks_pcie, OB_SIZE, CFG_PCIM_WIN_SZ_IDX & 0x7);
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++) {
ks_dw_app_writel(ks_pcie, OB_OFFSET_INDEX(i), start | 1);
ks_dw_app_writel(ks_pcie, OB_OFFSET_HI(i), 0);
start += tr_size;
}
/* Enable OB translation */
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, OB_XLAT_EN_VAL | val);
}
/**
* 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 dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
u32 regval;
if (bus == 0)
return pci->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);
ks_dw_app_writel(ks_pcie, CFG_SETUP, regval);
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 dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
u8 bus_num = bus->number;
void __iomem *addr;
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
return dw_pcie_read(addr + 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 dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
u8 bus_num = bus->number;
void __iomem *addr;
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
return dw_pcie_write(addr + 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 dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
/* Configure and set up BAR0 */
ks_dw_pcie_set_dbi_mode(ks_pcie);
/* Enable BAR0 */
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
ks_dw_pcie_clear_dbi_mode(ks_pcie);
/*
* For BAR0, just setting bus address for inbound writes (MSI) should
* be sufficient. Use physical address to avoid any conflicts.
*/
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
}
/**
* ks_dw_pcie_link_up() - Check if link up
*/
int ks_dw_pcie_link_up(struct dw_pcie *pci)
{
u32 val;
val = dw_pcie_readl_dbi(pci, 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 = ks_dw_app_readl(ks_pcie, CMD_STATUS);
val &= ~LTSSM_EN_VAL;
ks_dw_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
/* Initiate Link Training */
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
}
/**
* 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 dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
struct resource *res;
/* Index 0 is the config reg. space address */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
/*
* We set these same and is used in pcie rd/wr_other_conf
* functions
*/
pp->va_cfg0_base = pci->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->va_app_base = devm_ioremap_resource(dev, res);
if (IS_ERR(ks_pcie->va_app_base))
return PTR_ERR(ks_pcie->va_app_base);
ks_pcie->app = *res;
/* Create legacy IRQ domain */
ks_pcie->legacy_irq_domain =
irq_domain_add_linear(ks_pcie->legacy_intc_np,
PCI_NUM_INTX,
&ks_dw_pcie_legacy_irq_domain_ops,
NULL);
if (!ks_pcie->legacy_irq_domain) {
dev_err(dev, "Failed to add irq domain for legacy irqs\n");
return -EINVAL;
}
return dw_pcie_host_init(pp);
}

489
drivers/pci/controller/dwc/pci-keystone.c
View File

@ -25,13 +25,62 @@
#include <linux/signal.h>
#include "pcie-designware.h"
#include "pci-keystone.h"
#define DRIVER_NAME "keystone-pcie"
/* DEV_STAT_CTRL */
#define PCIE_CAP_BASE 0x70
/* Application register defines */
#define LTSSM_EN_VAL BIT(0)
#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
/* Error IRQ bits */
#define ERR_AER BIT(5) /* ECRC error */
#define ERR_AXI BIT(4) /* AXI tag lookup fatal error */
#define ERR_CORR BIT(3) /* Correctable error */
#define ERR_NONFATAL BIT(2) /* Non-fatal error */
#define ERR_FATAL BIT(1) /* Fatal error */
#define ERR_SYS BIT(0) /* System (fatal, non-fatal, or correctable) */
#define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \
ERR_NONFATAL | ERR_FATAL | ERR_SYS)
#define ERR_FATAL_IRQ (ERR_FATAL | ERR_AXI)
#define ERR_IRQ_STATUS_RAW 0x1c0
#define ERR_IRQ_STATUS 0x1c4
#define ERR_IRQ_ENABLE_SET 0x1c8
#define ERR_IRQ_ENABLE_CLR 0x1cc
/* Config space registers */
#define DEBUG0 0x728
#define MAX_MSI_HOST_IRQS 8
/* PCIE controller device IDs */
#define PCIE_RC_K2HK 0xb008
#define PCIE_RC_K2E 0xb009
@ -40,6 +89,444 @@
#define to_keystone_pcie(x) dev_get_drvdata((x)->dev)
struct keystone_pcie {
struct dw_pcie *pci;
struct clk *clk;
/* PCI Device ID */
u32 device_id;
int num_legacy_host_irqs;
int legacy_host_irqs[PCI_NUM_INTX];
struct device_node *legacy_intc_np;
int num_msi_host_irqs;
int msi_host_irqs[MAX_MSI_HOST_IRQS];
struct device_node *msi_intc_np;
struct irq_domain *legacy_irq_domain;
struct device_node *np;
int error_irq;
/* Application register space */
void __iomem *va_app_base; /* DT 1st resource */
struct resource app;
};
static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
u32 *bit_pos)
{
*reg_offset = offset % 8;
*bit_pos = offset >> 3;
}
static phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
return ks_pcie->app.start + MSI_IRQ;
}
static u32 ks_dw_app_readl(struct keystone_pcie *ks_pcie, u32 offset)
{
return readl(ks_pcie->va_app_base + offset);
}
static void ks_dw_app_writel(struct keystone_pcie *ks_pcie, u32 offset, u32 val)
{
writel(val, ks_pcie->va_app_base + offset);
}
static void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
{
struct dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = pci->dev;
u32 pending, vector;
int src, virq;
pending = ks_dw_app_readl(ks_pcie, 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(dev, "irq: bit %d, vector %d, virq %d\n",
src, vector, virq);
generic_handle_irq(virq);
}
}
}
static void ks_dw_pcie_msi_irq_ack(int irq, struct pcie_port *pp)
{
u32 reg_offset, bit_pos;
struct keystone_pcie *ks_pcie;
struct dw_pcie *pci;
pci = to_dw_pcie_from_pp(pp);
ks_pcie = to_keystone_pcie(pci);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
ks_dw_app_writel(ks_pcie, MSI0_IRQ_STATUS + (reg_offset << 4),
BIT(bit_pos));
ks_dw_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET);
}
static void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
{
u32 reg_offset, bit_pos;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
ks_dw_app_writel(ks_pcie, MSI0_IRQ_ENABLE_SET + (reg_offset << 4),
BIT(bit_pos));
}
static void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
{
u32 reg_offset, bit_pos;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
ks_dw_app_writel(ks_pcie, MSI0_IRQ_ENABLE_CLR + (reg_offset << 4),
BIT(bit_pos));
}
static int ks_dw_pcie_msi_host_init(struct pcie_port *pp)
{
return dw_pcie_allocate_domains(pp);
}
static void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
{
int i;
for (i = 0; i < PCI_NUM_INTX; i++)
ks_dw_app_writel(ks_pcie, IRQ_ENABLE_SET + (i << 4), 0x1);
}
static void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
int offset)
{
struct dw_pcie *pci = ks_pcie->pci;
struct device *dev = pci->dev;
u32 pending;
int virq;
pending = ks_dw_app_readl(ks_pcie, IRQ_STATUS + (offset << 4));
if (BIT(0) & pending) {
virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq);
generic_handle_irq(virq);
}
/* EOI the INTx interrupt */
ks_dw_app_writel(ks_pcie, IRQ_EOI, offset);
}
static void ks_dw_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
{
ks_dw_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
}
static irqreturn_t ks_dw_pcie_handle_error_irq(struct keystone_pcie *ks_pcie)
{
u32 status;
status = ks_dw_app_readl(ks_pcie, ERR_IRQ_STATUS_RAW) & ERR_IRQ_ALL;
if (!status)
return IRQ_NONE;
if (status & ERR_FATAL_IRQ)
dev_err(ks_pcie->pci->dev, "fatal error (status %#010x)\n",
status);
/* Ack the IRQ; status bits are RW1C */
ks_dw_app_writel(ks_pcie, ERR_IRQ_STATUS, status);
return IRQ_HANDLED;
}
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);
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(struct keystone_pcie *ks_pcie)
{
u32 val;
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, DBI_CS2_EN_VAL | val);
do {
val = ks_dw_app_readl(ks_pcie, 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(struct keystone_pcie *ks_pcie)
{
u32 val;
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, ~DBI_CS2_EN_VAL & val);
do {
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
} while (val & DBI_CS2_EN_VAL);
}
static void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
{
struct dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
u32 start = pp->mem->start, end = pp->mem->end;
int i, tr_size;
u32 val;
/* Disable BARs for inbound access */
ks_dw_pcie_set_dbi_mode(ks_pcie);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0);
ks_dw_pcie_clear_dbi_mode(ks_pcie);
/* Set outbound translation size per window division */
ks_dw_app_writel(ks_pcie, OB_SIZE, CFG_PCIM_WIN_SZ_IDX & 0x7);
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++) {
ks_dw_app_writel(ks_pcie, OB_OFFSET_INDEX(i), start | 1);
ks_dw_app_writel(ks_pcie, OB_OFFSET_HI(i), 0);
start += tr_size;
}
/* Enable OB translation */
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, OB_XLAT_EN_VAL | val);
}
/**
* 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 dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
u32 regval;
if (bus == 0)
return pci->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);
ks_dw_app_writel(ks_pcie, CFG_SETUP, regval);
return pp->va_cfg0_base;
}
static 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 dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
u8 bus_num = bus->number;
void __iomem *addr;
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
return dw_pcie_read(addr + where, size, val);
}
static 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 dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
u8 bus_num = bus->number;
void __iomem *addr;
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
return dw_pcie_write(addr + 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
*/
static void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
/* Configure and set up BAR0 */
ks_dw_pcie_set_dbi_mode(ks_pcie);
/* Enable BAR0 */
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1);
ks_dw_pcie_clear_dbi_mode(ks_pcie);
/*
* For BAR0, just setting bus address for inbound writes (MSI) should
* be sufficient. Use physical address to avoid any conflicts.
*/
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start);
}
/**
* ks_dw_pcie_link_up() - Check if link up
*/
static int ks_dw_pcie_link_up(struct dw_pcie *pci)
{
u32 val;
val = dw_pcie_readl_dbi(pci, DEBUG0);
return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
}
static void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
{
u32 val;
/* Disable Link training */
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
val &= ~LTSSM_EN_VAL;
ks_dw_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
/* Initiate Link Training */
val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
ks_dw_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
}
/**
* 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.
*/
static int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie)
{
struct dw_pcie *pci = ks_pcie->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
struct resource *res;
/* Index 0 is the config reg. space address */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
/*
* We set these same and is used in pcie rd/wr_other_conf
* functions
*/
pp->va_cfg0_base = pci->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->va_app_base = devm_ioremap_resource(dev, res);
if (IS_ERR(ks_pcie->va_app_base))
return PTR_ERR(ks_pcie->va_app_base);
ks_pcie->app = *res;
/* Create legacy IRQ domain */
ks_pcie->legacy_irq_domain =
irq_domain_add_linear(ks_pcie->legacy_intc_np,
PCI_NUM_INTX,
&ks_dw_pcie_legacy_irq_domain_ops,
NULL);
if (!ks_pcie->legacy_irq_domain) {
dev_err(dev, "Failed to add irq domain for legacy irqs\n");
return -EINVAL;
}
return dw_pcie_host_init(pp);
}
static void quirk_limit_mrrs(struct pci_dev *dev)
{
struct pci_bus *bus = dev->bus;

56
drivers/pci/controller/dwc/pci-keystone.h
View File

@ -1,56 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Keystone PCI Controller's common includes
*
* Copyright (C) 2013-2014 Texas Instruments., Ltd.
* http://www.ti.com
*
* Author: Murali Karicheri <m-karicheri2@ti.com>
*/
#define MAX_MSI_HOST_IRQS 8
struct keystone_pcie {
struct dw_pcie *pci;
struct clk *clk;
/* PCI Device ID */
u32 device_id;
int num_legacy_host_irqs;
int legacy_host_irqs[PCI_NUM_INTX];
struct device_node *legacy_intc_np;
int num_msi_host_irqs;
int msi_host_irqs[MAX_MSI_HOST_IRQS];
struct device_node *msi_intc_np;
struct irq_domain *legacy_irq_domain;
struct device_node *np;
int error_irq;
/* Application register space */
void __iomem *va_app_base; /* DT 1st resource */
struct resource app;
};
/* Keystone DW specific MSI controller APIs/definitions */
void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset);
phys_addr_t ks_dw_pcie_get_msi_addr(struct pcie_port *pp);
/* Keystone specific PCI controller APIs */
void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie);
void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset);
void ks_dw_pcie_enable_error_irq(struct keystone_pcie *ks_pcie);
irqreturn_t ks_dw_pcie_handle_error_irq(struct keystone_pcie *ks_pcie);
int ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie);
int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
unsigned int devfn, int where, int size, u32 val);
int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
unsigned int devfn, int where, int size, u32 *val);
void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie);
void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie);
void ks_dw_pcie_msi_irq_ack(int i, struct pcie_port *pp);
void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq);
void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq);
void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp);
int ks_dw_pcie_msi_host_init(struct pcie_port *pp);
int ks_dw_pcie_link_up(struct dw_pcie *pci);