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PCI: altera: Add Stratix 10 PCIe support 

Add PCIe Root Port support for Stratix 10 device.

Main differences compared to the PCIe Root Port IP on Cyclone V
and Arria 10 devices:

- HIP interface to access Root Port configuration register
- TLP programming flow:
  - One REG0 register
  - Don't need to check alignment

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Ley Foon Tan 2019-02-28 18:52:50 +08:00 committed by Lorenzo Pieralisi
parent bfeffd1552
commit 49fdbd7cfe
1 changed files with 246 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

270
drivers/pci/controller/pcie-altera.c
View File

@ -11,6 +11,7 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/init.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
@ -37,7 +38,12 @@
#define RP_LTSSM_MASK 0x1f
#define LTSSM_L0 0xf
#define PCIE_CAP_OFFSET 0x80
#define S10_RP_TX_CNTRL 0x2004
#define S10_RP_RXCPL_REG 0x2008
#define S10_RP_RXCPL_STATUS 0x200C
#define S10_RP_CFG_ADDR(pcie, reg) \
(((pcie)->hip_base) + (reg) + (1 << 20))
/* TLP configuration type 0 and 1 */
#define TLP_FMTTYPE_CFGRD0 0x04 /* Configuration Read Type 0 */
#define TLP_FMTTYPE_CFGWR0 0x44 /* Configuration Write Type 0 */
@ -49,18 +55,19 @@
#define RP_DEVFN 0
#define TLP_REQ_ID(bus, devfn) (((bus) << 8) | (devfn))
#define TLP_CFGRD_DW0(pcie, bus) \
((((bus == pcie->root_bus_nr) ? TLP_FMTTYPE_CFGRD0 \
: TLP_FMTTYPE_CFGRD1) << 24) | \
TLP_PAYLOAD_SIZE)
((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgrd0 \
: pcie->pcie_data->cfgrd1) << 24) | \
TLP_PAYLOAD_SIZE)
#define TLP_CFGWR_DW0(pcie, bus) \
((((bus == pcie->root_bus_nr) ? TLP_FMTTYPE_CFGWR0 \
: TLP_FMTTYPE_CFGWR1) << 24) | \
TLP_PAYLOAD_SIZE)
((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgwr0 \
: pcie->pcie_data->cfgwr1) << 24) | \
TLP_PAYLOAD_SIZE)
#define TLP_CFG_DW1(pcie, tag, be) \
(((TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN)) << 16) | (tag << 8) | (be))
(((TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN)) << 16) | (tag << 8) | (be))
#define TLP_CFG_DW2(bus, devfn, offset) \
(((bus) << 24) | ((devfn) << 16) | (offset))
#define TLP_COMP_STATUS(s) (((s) >> 13) & 7)
#define TLP_BYTE_COUNT(s) (((s) >> 0) & 0xfff)
#define TLP_HDR_SIZE 3
#define TLP_LOOP 500
@ -69,14 +76,47 @@
#define DWORD_MASK 3
#define S10_TLP_FMTTYPE_CFGRD0 0x05
#define S10_TLP_FMTTYPE_CFGRD1 0x04
#define S10_TLP_FMTTYPE_CFGWR0 0x45
#define S10_TLP_FMTTYPE_CFGWR1 0x44
enum altera_pcie_version {
ALTERA_PCIE_V1 = 0,
ALTERA_PCIE_V2,
};
struct altera_pcie {
struct platform_device *pdev;
void __iomem *cra_base; /* DT Cra */
void __iomem *cra_base;
void __iomem *hip_base;
int irq;
u8 root_bus_nr;
struct irq_domain *irq_domain;
struct resource bus_range;
struct list_head resources;
const struct altera_pcie_data *pcie_data;
};
struct altera_pcie_ops {
int (*tlp_read_pkt)(struct altera_pcie *pcie, u32 *value);
void (*tlp_write_pkt)(struct altera_pcie *pcie, u32 *headers,
u32 data, bool align);
bool (*get_link_status)(struct altera_pcie *pcie);
int (*rp_read_cfg)(struct altera_pcie *pcie, int where,
int size, u32 *value);
int (*rp_write_cfg)(struct altera_pcie *pcie, u8 busno,
int where, int size, u32 value);
};
struct altera_pcie_data {
const struct altera_pcie_ops *ops;
enum altera_pcie_version version;
u32 cap_offset; /* PCIe capability structure register offset */
u32 cfgrd0;
u32 cfgrd1;
u32 cfgwr0;
u32 cfgwr1;
};
struct tlp_rp_regpair_t {
@ -101,6 +141,15 @@ static bool altera_pcie_link_up(struct altera_pcie *pcie)
return !!((cra_readl(pcie, RP_LTSSM) & RP_LTSSM_MASK) == LTSSM_L0);
}
static bool s10_altera_pcie_link_up(struct altera_pcie *pcie)
{
void __iomem *addr = S10_RP_CFG_ADDR(pcie,
pcie->pcie_data->cap_offset +
PCI_EXP_LNKSTA);
return !!(readw(addr) & PCI_EXP_LNKSTA_DLLLA);
}
/*
* Altera PCIe port uses BAR0 of RC's configuration space as the translation
* from PCI bus to native BUS. Entire DDR region is mapped into PCIe space
@ -128,12 +177,18 @@ static void tlp_write_tx(struct altera_pcie *pcie,
cra_writel(pcie, tlp_rp_regdata->ctrl, RP_TX_CNTRL);
}
static void s10_tlp_write_tx(struct altera_pcie *pcie, u32 reg0, u32 ctrl)
{
cra_writel(pcie, reg0, RP_TX_REG0);
cra_writel(pcie, ctrl, S10_RP_TX_CNTRL);
}
static bool altera_pcie_valid_device(struct altera_pcie *pcie,
struct pci_bus *bus, int dev)
{
/* If there is no link, then there is no device */
if (bus->number != pcie->root_bus_nr) {
if (!altera_pcie_link_up(pcie))
if (!pcie->pcie_data->ops->get_link_status(pcie))
return false;
}
@ -183,6 +238,53 @@ static int tlp_read_packet(struct altera_pcie *pcie, u32 *value)
return PCIBIOS_DEVICE_NOT_FOUND;
}
static int s10_tlp_read_packet(struct altera_pcie *pcie, u32 *value)
{
u32 ctrl;
u32 comp_status;
u32 dw[4];
u32 count;
struct device *dev = &pcie->pdev->dev;
for (count = 0; count < TLP_LOOP; count++) {
ctrl = cra_readl(pcie, S10_RP_RXCPL_STATUS);
if (ctrl & RP_RXCPL_SOP) {
/* Read first DW */
dw[0] = cra_readl(pcie, S10_RP_RXCPL_REG);
break;
}
udelay(5);
}
/* SOP detection failed, return error */
if (count == TLP_LOOP)
return PCIBIOS_DEVICE_NOT_FOUND;
count = 1;
/* Poll for EOP */
while (count < ARRAY_SIZE(dw)) {
ctrl = cra_readl(pcie, S10_RP_RXCPL_STATUS);
dw[count++] = cra_readl(pcie, S10_RP_RXCPL_REG);
if (ctrl & RP_RXCPL_EOP) {
comp_status = TLP_COMP_STATUS(dw[1]);
if (comp_status)
return PCIBIOS_DEVICE_NOT_FOUND;
if (value && TLP_BYTE_COUNT(dw[1]) == sizeof(u32) &&
count == 4)
*value = dw[3];
return PCIBIOS_SUCCESSFUL;
}
}
dev_warn(dev, "Malformed TLP packet\n");
return PCIBIOS_DEVICE_NOT_FOUND;
}
static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
u32 data, bool align)
{
@ -210,6 +312,15 @@ static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
tlp_write_tx(pcie, &tlp_rp_regdata);
}
static void s10_tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
u32 data, bool dummy)
{
s10_tlp_write_tx(pcie, headers[0], RP_TX_SOP);
s10_tlp_write_tx(pcie, headers[1], 0);
s10_tlp_write_tx(pcie, headers[2], 0);
s10_tlp_write_tx(pcie, data, RP_TX_EOP);
}
static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
int where, u8 byte_en, u32 *value)
{
@ -219,9 +330,9 @@ static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
headers[2] = TLP_CFG_DW2(bus, devfn, where);
tlp_write_packet(pcie, headers, 0, false);
pcie->pcie_data->ops->tlp_write_pkt(pcie, headers, 0, false);
return tlp_read_packet(pcie, value);
return pcie->pcie_data->ops->tlp_read_pkt(pcie, value);
}
static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
@ -236,11 +347,13 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
/* check alignment to Qword */
if ((where & 0x7) == 0)
tlp_write_packet(pcie, headers, value, true);
pcie->pcie_data->ops->tlp_write_pkt(pcie, headers,
value, true);
else
tlp_write_packet(pcie, headers, value, false);
pcie->pcie_data->ops->tlp_write_pkt(pcie, headers,
value, false);
ret = tlp_read_packet(pcie, NULL);
ret = pcie->pcie_data->ops->tlp_read_pkt(pcie, NULL);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
@ -254,6 +367,53 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
return PCIBIOS_SUCCESSFUL;
}
static int s10_rp_read_cfg(struct altera_pcie *pcie, int where,
int size, u32 *value)
{
void __iomem *addr = S10_RP_CFG_ADDR(pcie, where);
switch (size) {
case 1:
*value = readb(addr);
break;
case 2:
*value = readw(addr);
break;
default:
*value = readl(addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int s10_rp_write_cfg(struct altera_pcie *pcie, u8 busno,
int where, int size, u32 value)
{
void __iomem *addr = S10_RP_CFG_ADDR(pcie, where);
switch (size) {
case 1:
writeb(value, addr);
break;
case 2:
writew(value, addr);
break;
default:
writel(value, addr);
break;
}
/*
* Monitor changes to PCI_PRIMARY_BUS register on root port
* and update local copy of root bus number accordingly.
*/
if (busno == pcie->root_bus_nr && where == PCI_PRIMARY_BUS)
pcie->root_bus_nr = value & 0xff;
return PCIBIOS_SUCCESSFUL;
}
static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
unsigned int devfn, int where, int size,
u32 *value)
@ -262,6 +422,10 @@ static int _altera_pcie_cfg_read(struct altera_pcie *pcie, u8 busno,
u32 data;
u8 byte_en;
if (busno == pcie->root_bus_nr && pcie->pcie_data->ops->rp_read_cfg)
return pcie->pcie_data->ops->rp_read_cfg(pcie, where,
size, value);
switch (size) {
case 1:
byte_en = 1 << (where & 3);
@ -302,6 +466,10 @@ static int _altera_pcie_cfg_write(struct altera_pcie *pcie, u8 busno,
u32 shift = 8 * (where & 3);
u8 byte_en;
if (busno == pcie->root_bus_nr && pcie->pcie_data->ops->rp_write_cfg)
return pcie->pcie_data->ops->rp_write_cfg(pcie, busno,
where, size, value);
switch (size) {
case 1:
data32 = (value & 0xff) << shift;
@ -365,7 +533,8 @@ static int altera_read_cap_word(struct altera_pcie *pcie, u8 busno,
int ret;
ret = _altera_pcie_cfg_read(pcie, busno, devfn,
PCIE_CAP_OFFSET + offset, sizeof(*value),
pcie->pcie_data->cap_offset + offset,
sizeof(*value),
&data);
*value = data;
return ret;
@ -375,7 +544,8 @@ static int altera_write_cap_word(struct altera_pcie *pcie, u8 busno,
unsigned int devfn, int offset, u16 value)
{
return _altera_pcie_cfg_write(pcie, busno, devfn,
PCIE_CAP_OFFSET + offset, sizeof(value),
pcie->pcie_data->cap_offset + offset,
sizeof(value),
value);
}
@ -403,7 +573,7 @@ static void altera_wait_link_retrain(struct altera_pcie *pcie)
/* Wait for link is up */
start_jiffies = jiffies;
for (;;) {
if (altera_pcie_link_up(pcie))
if (pcie->pcie_data->ops->get_link_status(pcie))
break;
if (time_after(jiffies, start_jiffies + LINK_UP_TIMEOUT)) {
@ -418,7 +588,7 @@ static void altera_pcie_retrain(struct altera_pcie *pcie)
{
u16 linkcap, linkstat, linkctl;
if (!altera_pcie_link_up(pcie))
if (!pcie->pcie_data->ops->get_link_status(pcie))
return;
/*
@ -540,12 +710,20 @@ static int altera_pcie_parse_dt(struct altera_pcie *pcie)
struct device *dev = &pcie->pdev->dev;
struct platform_device *pdev = pcie->pdev;
struct resource *cra;
struct resource *hip;
cra = platform_get_resource_byname(pdev, IORESOURCE_MEM, "Cra");
pcie->cra_base = devm_ioremap_resource(dev, cra);
if (IS_ERR(pcie->cra_base))
return PTR_ERR(pcie->cra_base);
if (pcie->pcie_data->version == ALTERA_PCIE_V2) {
hip = platform_get_resource_byname(pdev, IORESOURCE_MEM, "Hip");
pcie->hip_base = devm_ioremap_resource(&pdev->dev, hip);
if (IS_ERR(pcie->hip_base))
return PTR_ERR(pcie->hip_base);
}
/* setup IRQ */
pcie->irq = platform_get_irq(pdev, 0);
if (pcie->irq < 0) {
@ -562,6 +740,48 @@ static void altera_pcie_host_init(struct altera_pcie *pcie)
altera_pcie_retrain(pcie);
}
static const struct altera_pcie_ops altera_pcie_ops_1_0 = {
.tlp_read_pkt = tlp_read_packet,
.tlp_write_pkt = tlp_write_packet,
.get_link_status = altera_pcie_link_up,
};
static const struct altera_pcie_ops altera_pcie_ops_2_0 = {
.tlp_read_pkt = s10_tlp_read_packet,
.tlp_write_pkt = s10_tlp_write_packet,
.get_link_status = s10_altera_pcie_link_up,
.rp_read_cfg = s10_rp_read_cfg,
.rp_write_cfg = s10_rp_write_cfg,
};
static const struct altera_pcie_data altera_pcie_1_0_data = {
.ops = &altera_pcie_ops_1_0,
.cap_offset = 0x80,
.version = ALTERA_PCIE_V1,
.cfgrd0 = TLP_FMTTYPE_CFGRD0,
.cfgrd1 = TLP_FMTTYPE_CFGRD1,
.cfgwr0 = TLP_FMTTYPE_CFGWR0,
.cfgwr1 = TLP_FMTTYPE_CFGWR1,
};
static const struct altera_pcie_data altera_pcie_2_0_data = {
.ops = &altera_pcie_ops_2_0,
.version = ALTERA_PCIE_V2,
.cap_offset = 0x70,
.cfgrd0 = S10_TLP_FMTTYPE_CFGRD0,
.cfgrd1 = S10_TLP_FMTTYPE_CFGRD1,
.cfgwr0 = S10_TLP_FMTTYPE_CFGWR0,
.cfgwr1 = S10_TLP_FMTTYPE_CFGWR1,
};
static const struct of_device_id altera_pcie_of_match[] = {
{.compatible = "altr,pcie-root-port-1.0",
.data = &altera_pcie_1_0_data },
{.compatible = "altr,pcie-root-port-2.0",
.data = &altera_pcie_2_0_data },
{},
};
static int altera_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -570,6 +790,7 @@ static int altera_pcie_probe(struct platform_device *pdev)
struct pci_bus *child;
struct pci_host_bridge *bridge;
int ret;
const struct of_device_id *match;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
if (!bridge)
@ -578,6 +799,12 @@ static int altera_pcie_probe(struct platform_device *pdev)
pcie = pci_host_bridge_priv(bridge);
pcie->pdev = pdev;
match = of_match_device(altera_pcie_of_match, &pdev->dev);
if (!match)
return -ENODEV;
pcie->pcie_data = match->data;
ret = altera_pcie_parse_dt(pcie);
if (ret) {
dev_err(dev, "Parsing DT failed\n");
@ -628,11 +855,6 @@ static int altera_pcie_probe(struct platform_device *pdev)
return ret;
}
static const struct of_device_id altera_pcie_of_match[] = {
{ .compatible = "altr,pcie-root-port-1.0", },
{},
};
static struct platform_driver altera_pcie_driver = {
.probe = altera_pcie_probe,
.driver = {