PCI: dwc: designware: Add EP mode support

Add endpoint mode support to designware driver. This uses the EP Core layer
introduced recently to add endpoint mode support.  *Any* function driver
can now use this designware device in order to achieve the EP
functionality.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Kishon Vijay Abraham I 2017-03-27 15:15:05 +05:30 committed by Bjorn Helgaas
parent 1357053381
commit f8aed6ec62
5 changed files with 578 additions and 0 deletions

View file

@ -9,6 +9,11 @@ config PCIE_DW_HOST
depends on PCI_MSI_IRQ_DOMAIN
select PCIE_DW
config PCIE_DW_EP
bool
depends on PCI_ENDPOINT
select PCIE_DW
config PCI_DRA7XX
bool "TI DRA7xx PCIe controller"
depends on PCI

View file

@ -1,5 +1,6 @@
obj-$(CONFIG_PCIE_DW) += pcie-designware.o
obj-$(CONFIG_PCIE_DW_HOST) += pcie-designware-host.o
obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o
obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o
obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o

View file

@ -0,0 +1,342 @@
/**
* Synopsys Designware PCIe Endpoint controller driver
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@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 of
* the License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/of.h>
#include "pcie-designware.h"
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
{
struct pci_epc *epc = ep->epc;
pci_epc_linkup(epc);
}
static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum pci_barno bar)
{
u32 reg;
reg = PCI_BASE_ADDRESS_0 + (4 * bar);
dw_pcie_writel_dbi2(pci, reg, 0x0);
dw_pcie_writel_dbi(pci, reg, 0x0);
}
static int dw_pcie_ep_write_header(struct pci_epc *epc,
struct pci_epf_header *hdr)
{
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, hdr->vendorid);
dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, hdr->deviceid);
dw_pcie_writeb_dbi(pci, PCI_REVISION_ID, hdr->revid);
dw_pcie_writeb_dbi(pci, PCI_CLASS_PROG, hdr->progif_code);
dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE,
hdr->subclass_code | hdr->baseclass_code << 8);
dw_pcie_writeb_dbi(pci, PCI_CACHE_LINE_SIZE,
hdr->cache_line_size);
dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_VENDOR_ID,
hdr->subsys_vendor_id);
dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_ID, hdr->subsys_id);
dw_pcie_writeb_dbi(pci, PCI_INTERRUPT_PIN,
hdr->interrupt_pin);
return 0;
}
static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum pci_barno bar,
dma_addr_t cpu_addr,
enum dw_pcie_as_type as_type)
{
int ret;
u32 free_win;
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
free_win = find_first_zero_bit(&ep->ib_window_map,
sizeof(ep->ib_window_map));
if (free_win >= ep->num_ib_windows) {
dev_err(pci->dev, "no free inbound window\n");
return -EINVAL;
}
ret = dw_pcie_prog_inbound_atu(pci, free_win, bar, cpu_addr,
as_type);
if (ret < 0) {
dev_err(pci->dev, "Failed to program IB window\n");
return ret;
}
ep->bar_to_atu[bar] = free_win;
set_bit(free_win, &ep->ib_window_map);
return 0;
}
static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
u64 pci_addr, size_t size)
{
u32 free_win;
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
free_win = find_first_zero_bit(&ep->ob_window_map,
sizeof(ep->ob_window_map));
if (free_win >= ep->num_ob_windows) {
dev_err(pci->dev, "no free outbound window\n");
return -EINVAL;
}
dw_pcie_prog_outbound_atu(pci, free_win, PCIE_ATU_TYPE_MEM,
phys_addr, pci_addr, size);
set_bit(free_win, &ep->ob_window_map);
ep->outbound_addr[free_win] = phys_addr;
return 0;
}
static void dw_pcie_ep_clear_bar(struct pci_epc *epc, enum pci_barno bar)
{
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
u32 atu_index = ep->bar_to_atu[bar];
dw_pcie_ep_reset_bar(pci, bar);
dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_INBOUND);
clear_bit(atu_index, &ep->ib_window_map);
}
static int dw_pcie_ep_set_bar(struct pci_epc *epc, enum pci_barno bar,
dma_addr_t bar_phys, size_t size, int flags)
{
int ret;
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
enum dw_pcie_as_type as_type;
u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar);
if (!(flags & PCI_BASE_ADDRESS_SPACE))
as_type = DW_PCIE_AS_MEM;
else
as_type = DW_PCIE_AS_IO;
ret = dw_pcie_ep_inbound_atu(ep, bar, bar_phys, as_type);
if (ret)
return ret;
dw_pcie_writel_dbi2(pci, reg, size - 1);
dw_pcie_writel_dbi(pci, reg, flags);
return 0;
}
static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
u32 *atu_index)
{
u32 index;
for (index = 0; index < ep->num_ob_windows; index++) {
if (ep->outbound_addr[index] != addr)
continue;
*atu_index = index;
return 0;
}
return -EINVAL;
}
static void dw_pcie_ep_unmap_addr(struct pci_epc *epc, phys_addr_t addr)
{
int ret;
u32 atu_index;
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
ret = dw_pcie_find_index(ep, addr, &atu_index);
if (ret < 0)
return;
dw_pcie_disable_atu(pci, atu_index, DW_PCIE_REGION_OUTBOUND);
clear_bit(atu_index, &ep->ob_window_map);
}
static int dw_pcie_ep_map_addr(struct pci_epc *epc, phys_addr_t addr,
u64 pci_addr, size_t size)
{
int ret;
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
ret = dw_pcie_ep_outbound_atu(ep, addr, pci_addr, size);
if (ret) {
dev_err(pci->dev, "failed to enable address\n");
return ret;
}
return 0;
}
static int dw_pcie_ep_get_msi(struct pci_epc *epc)
{
int val;
u32 lower_addr;
u32 upper_addr;
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
val = dw_pcie_readb_dbi(pci, MSI_MESSAGE_CONTROL);
val = (val & MSI_CAP_MME_MASK) >> MSI_CAP_MME_SHIFT;
lower_addr = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_L32);
upper_addr = dw_pcie_readl_dbi(pci, MSI_MESSAGE_ADDR_U32);
if (!(lower_addr || upper_addr))
return -EINVAL;
return val;
}
static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 encode_int)
{
int val;
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
val = (encode_int << MSI_CAP_MMC_SHIFT);
dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, val);
return 0;
}
static int dw_pcie_ep_raise_irq(struct pci_epc *epc,
enum pci_epc_irq_type type, u8 interrupt_num)
{
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
if (!ep->ops->raise_irq)
return -EINVAL;
return ep->ops->raise_irq(ep, type, interrupt_num);
}
static void dw_pcie_ep_stop(struct pci_epc *epc)
{
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
if (!pci->ops->stop_link)
return;
pci->ops->stop_link(pci);
}
static int dw_pcie_ep_start(struct pci_epc *epc)
{
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
if (!pci->ops->start_link)
return -EINVAL;
return pci->ops->start_link(pci);
}
static const struct pci_epc_ops epc_ops = {
.write_header = dw_pcie_ep_write_header,
.set_bar = dw_pcie_ep_set_bar,
.clear_bar = dw_pcie_ep_clear_bar,
.map_addr = dw_pcie_ep_map_addr,
.unmap_addr = dw_pcie_ep_unmap_addr,
.set_msi = dw_pcie_ep_set_msi,
.get_msi = dw_pcie_ep_get_msi,
.raise_irq = dw_pcie_ep_raise_irq,
.start = dw_pcie_ep_start,
.stop = dw_pcie_ep_stop,
};
void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
{
struct pci_epc *epc = ep->epc;
pci_epc_mem_exit(epc);
}
int dw_pcie_ep_init(struct dw_pcie_ep *ep)
{
int ret;
void *addr;
enum pci_barno bar;
struct pci_epc *epc;
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct device *dev = pci->dev;
struct device_node *np = dev->of_node;
if (!pci->dbi_base || !pci->dbi_base2) {
dev_err(dev, "dbi_base/deb_base2 is not populated\n");
return -EINVAL;
}
ret = of_property_read_u32(np, "num-ib-windows", &ep->num_ib_windows);
if (ret < 0) {
dev_err(dev, "unable to read *num-ib-windows* property\n");
return ret;
}
ret = of_property_read_u32(np, "num-ob-windows", &ep->num_ob_windows);
if (ret < 0) {
dev_err(dev, "unable to read *num-ob-windows* property\n");
return ret;
}
addr = devm_kzalloc(dev, sizeof(phys_addr_t) * ep->num_ob_windows,
GFP_KERNEL);
if (!addr)
return -ENOMEM;
ep->outbound_addr = addr;
for (bar = BAR_0; bar <= BAR_5; bar++)
dw_pcie_ep_reset_bar(pci, bar);
if (ep->ops->ep_init)
ep->ops->ep_init(ep);
epc = devm_pci_epc_create(dev, &epc_ops);
if (IS_ERR(epc)) {
dev_err(dev, "failed to create epc device\n");
return PTR_ERR(epc);
}
ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
if (ret < 0)
epc->max_functions = 1;
ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size);
if (ret < 0) {
dev_err(dev, "Failed to initialize address space\n");
return ret;
}
ep->epc = epc;
epc_set_drvdata(epc, ep);
dw_pcie_setup(pci);
return 0;
}

View file

@ -185,6 +185,131 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
dev_err(pci->dev, "outbound iATU is not being enabled\n");
}
static u32 dw_pcie_readl_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg)
{
u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);
return dw_pcie_readl_dbi(pci, offset + reg);
}
static void dw_pcie_writel_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg,
u32 val)
{
u32 offset = PCIE_GET_ATU_INB_UNR_REG_OFFSET(index);
dw_pcie_writel_dbi(pci, offset + reg, val);
}
int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index, int bar,
u64 cpu_addr, enum dw_pcie_as_type as_type)
{
int type;
u32 retries, val;
dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
lower_32_bits(cpu_addr));
dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
upper_32_bits(cpu_addr));
switch (as_type) {
case DW_PCIE_AS_MEM:
type = PCIE_ATU_TYPE_MEM;
break;
case DW_PCIE_AS_IO:
type = PCIE_ATU_TYPE_IO;
break;
default:
return -EINVAL;
}
dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, type);
dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
PCIE_ATU_ENABLE |
PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
/*
* Make sure ATU enable takes effect before any subsequent config
* and I/O accesses.
*/
for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
val = dw_pcie_readl_ib_unroll(pci, index,
PCIE_ATU_UNR_REGION_CTRL2);
if (val & PCIE_ATU_ENABLE)
return 0;
usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
}
dev_err(pci->dev, "inbound iATU is not being enabled\n");
return -EBUSY;
}
int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
u64 cpu_addr, enum dw_pcie_as_type as_type)
{
int type;
u32 retries, val;
if (pci->iatu_unroll_enabled)
return dw_pcie_prog_inbound_atu_unroll(pci, index, bar,
cpu_addr, as_type);
dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND |
index);
dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, lower_32_bits(cpu_addr));
dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, upper_32_bits(cpu_addr));
switch (as_type) {
case DW_PCIE_AS_MEM:
type = PCIE_ATU_TYPE_MEM;
break;
case DW_PCIE_AS_IO:
type = PCIE_ATU_TYPE_IO;
break;
default:
return -EINVAL;
}
dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type);
dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, PCIE_ATU_ENABLE
| PCIE_ATU_BAR_MODE_ENABLE | (bar << 8));
/*
* Make sure ATU enable takes effect before any subsequent config
* and I/O accesses.
*/
for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
val = dw_pcie_readl_dbi(pci, PCIE_ATU_CR2);
if (val & PCIE_ATU_ENABLE)
return 0;
usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
}
dev_err(pci->dev, "inbound iATU is not being enabled\n");
return -EBUSY;
}
void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
enum dw_pcie_region_type type)
{
int region;
switch (type) {
case DW_PCIE_REGION_INBOUND:
region = PCIE_ATU_REGION_INBOUND;
break;
case DW_PCIE_REGION_OUTBOUND:
region = PCIE_ATU_REGION_OUTBOUND;
break;
default:
return;
}
dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index);
dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~PCIE_ATU_ENABLE);
}
int dw_pcie_wait_for_link(struct dw_pcie *pci)
{
int retries;

View file

@ -18,6 +18,9 @@
#include <linux/msi.h>
#include <linux/pci.h>
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
/* Parameters for the waiting for link up routine */
#define LINK_WAIT_MAX_RETRIES 10
#define LINK_WAIT_USLEEP_MIN 90000
@ -89,6 +92,16 @@
#define PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(region) \
((0x3 << 20) | ((region) << 9))
#define PCIE_GET_ATU_INB_UNR_REG_OFFSET(region) \
((0x3 << 20) | ((region) << 9) | (0x1 << 8))
#define MSI_MESSAGE_CONTROL 0x52
#define MSI_CAP_MMC_SHIFT 1
#define MSI_CAP_MME_SHIFT 4
#define MSI_CAP_MME_MASK (7 << MSI_CAP_MME_SHIFT)
#define MSI_MESSAGE_ADDR_L32 0x54
#define MSI_MESSAGE_ADDR_U32 0x58
/*
* Maximum number of MSI IRQs can be 256 per controller. But keep
* it 32 as of now. Probably we will never need more than 32. If needed,
@ -99,6 +112,13 @@
struct pcie_port;
struct dw_pcie;
struct dw_pcie_ep;
enum dw_pcie_region_type {
DW_PCIE_REGION_UNKNOWN,
DW_PCIE_REGION_INBOUND,
DW_PCIE_REGION_OUTBOUND,
};
struct dw_pcie_host_ops {
int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val);
@ -142,6 +162,31 @@ struct pcie_port {
DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
};
enum dw_pcie_as_type {
DW_PCIE_AS_UNKNOWN,
DW_PCIE_AS_MEM,
DW_PCIE_AS_IO,
};
struct dw_pcie_ep_ops {
void (*ep_init)(struct dw_pcie_ep *ep);
int (*raise_irq)(struct dw_pcie_ep *ep, enum pci_epc_irq_type type,
u8 interrupt_num);
};
struct dw_pcie_ep {
struct pci_epc *epc;
struct dw_pcie_ep_ops *ops;
phys_addr_t phys_base;
size_t addr_size;
u8 bar_to_atu[6];
phys_addr_t *outbound_addr;
unsigned long ib_window_map;
unsigned long ob_window_map;
u32 num_ib_windows;
u32 num_ob_windows;
};
struct dw_pcie_ops {
u64 (*cpu_addr_fixup)(u64 cpu_addr);
u32 (*read_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
@ -149,19 +194,26 @@ struct dw_pcie_ops {
void (*write_dbi)(struct dw_pcie *pcie, void __iomem *base, u32 reg,
size_t size, u32 val);
int (*link_up)(struct dw_pcie *pcie);
int (*start_link)(struct dw_pcie *pcie);
void (*stop_link)(struct dw_pcie *pcie);
};
struct dw_pcie {
struct device *dev;
void __iomem *dbi_base;
void __iomem *dbi_base2;
u32 num_viewport;
u8 iatu_unroll_enabled;
struct pcie_port pp;
struct dw_pcie_ep ep;
const struct dw_pcie_ops *ops;
};
#define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
#define to_dw_pcie_from_ep(endpoint) \
container_of((endpoint), struct dw_pcie, ep)
int dw_pcie_read(void __iomem *addr, int size, u32 *val);
int dw_pcie_write(void __iomem *addr, int size, u32 val);
@ -174,6 +226,10 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci);
void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
int type, u64 cpu_addr, u64 pci_addr,
u32 size);
int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
u64 cpu_addr, enum dw_pcie_as_type as_type);
void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
enum dw_pcie_region_type type);
void dw_pcie_setup(struct dw_pcie *pci);
static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
@ -186,6 +242,36 @@ static inline u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg)
return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x4);
}
static inline void dw_pcie_writew_dbi(struct dw_pcie *pci, u32 reg, u16 val)
{
__dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x2, val);
}
static inline u16 dw_pcie_readw_dbi(struct dw_pcie *pci, u32 reg)
{
return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x2);
}
static inline void dw_pcie_writeb_dbi(struct dw_pcie *pci, u32 reg, u8 val)
{
__dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x1, val);
}
static inline u8 dw_pcie_readb_dbi(struct dw_pcie *pci, u32 reg)
{
return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x1);
}
static inline void dw_pcie_writel_dbi2(struct dw_pcie *pci, u32 reg, u32 val)
{
__dw_pcie_write_dbi(pci, pci->dbi_base2, reg, 0x4, val);
}
static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg)
{
return __dw_pcie_read_dbi(pci, pci->dbi_base2, reg, 0x4);
}
#ifdef CONFIG_PCIE_DW_HOST
irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
void dw_pcie_msi_init(struct pcie_port *pp);
@ -210,4 +296,23 @@ static inline int dw_pcie_host_init(struct pcie_port *pp)
return 0;
}
#endif
#ifdef CONFIG_PCIE_DW_EP
void dw_pcie_ep_linkup(struct dw_pcie_ep *ep);
int dw_pcie_ep_init(struct dw_pcie_ep *ep);
void dw_pcie_ep_exit(struct dw_pcie_ep *ep);
#else
static inline void dw_pcie_ep_linkup(struct dw_pcie_ep *ep)
{
}
static inline int dw_pcie_ep_init(struct dw_pcie_ep *ep)
{
return 0;
}
static inline void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
{
}
#endif
#endif /* _PCIE_DESIGNWARE_H */