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path: root/drivers/pci/controller/pcie-rcar.c
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Diffstat (limited to 'drivers/pci/controller/pcie-rcar.c')
-rw-r--r--drivers/pci/controller/pcie-rcar.c85
1 files changed, 55 insertions, 30 deletions
diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
index c8febb009454..f6a669a9af41 100644
--- a/drivers/pci/controller/pcie-rcar.c
+++ b/drivers/pci/controller/pcie-rcar.c
@@ -46,14 +46,15 @@
/* Transfer control */
#define PCIETCTLR 0x02000
-#define CFINIT 1
+#define DL_DOWN BIT(3)
+#define CFINIT BIT(0)
#define PCIETSTR 0x02004
-#define DATA_LINK_ACTIVE 1
+#define DATA_LINK_ACTIVE BIT(0)
#define PCIEERRFR 0x02020
#define UNSUPPORTED_REQUEST BIT(4)
#define PCIEMSIFR 0x02044
#define PCIEMSIALR 0x02048
-#define MSIFE 1
+#define MSIFE BIT(0)
#define PCIEMSIAUR 0x0204c
#define PCIEMSIIER 0x02050
@@ -94,6 +95,7 @@
#define MACCTLR 0x011058
#define SPEED_CHANGE BIT(24)
#define SCRAMBLE_DISABLE BIT(27)
+#define PMSR 0x01105c
#define MACS2R 0x011078
#define MACCGSPSETR 0x011084
#define SPCNGRSN BIT(31)
@@ -152,14 +154,13 @@ struct rcar_pcie {
struct rcar_msi msi;
};
-static void rcar_pci_write_reg(struct rcar_pcie *pcie, unsigned long val,
- unsigned long reg)
+static void rcar_pci_write_reg(struct rcar_pcie *pcie, u32 val,
+ unsigned int reg)
{
writel(val, pcie->base + reg);
}
-static unsigned long rcar_pci_read_reg(struct rcar_pcie *pcie,
- unsigned long reg)
+static u32 rcar_pci_read_reg(struct rcar_pcie *pcie, unsigned int reg)
{
return readl(pcie->base + reg);
}
@@ -171,7 +172,7 @@ enum {
static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
{
- int shift = 8 * (where & 3);
+ unsigned int shift = BITS_PER_BYTE * (where & 3);
u32 val = rcar_pci_read_reg(pcie, where & ~3);
val &= ~(mask << shift);
@@ -181,7 +182,7 @@ static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
{
- int shift = 8 * (where & 3);
+ unsigned int shift = BITS_PER_BYTE * (where & 3);
u32 val = rcar_pci_read_reg(pcie, where & ~3);
return val >> shift;
@@ -192,7 +193,7 @@ static int rcar_pcie_config_access(struct rcar_pcie *pcie,
unsigned char access_type, struct pci_bus *bus,
unsigned int devfn, int where, u32 *data)
{
- int dev, func, reg, index;
+ unsigned int dev, func, reg, index;
dev = PCI_SLOT(devfn);
func = PCI_FUNC(devfn);
@@ -281,12 +282,12 @@ static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
}
if (size == 1)
- *val = (*val >> (8 * (where & 3))) & 0xff;
+ *val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;
else if (size == 2)
- *val = (*val >> (8 * (where & 2))) & 0xffff;
+ *val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff;
- dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
- bus->number, devfn, where, size, (unsigned long)*val);
+ dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
+ bus->number, devfn, where, size, *val);
return ret;
}
@@ -296,23 +297,24 @@ static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
struct rcar_pcie *pcie = bus->sysdata;
- int shift, ret;
+ unsigned int shift;
u32 data;
+ int ret;
ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
bus, devfn, where, &data);
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
- dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
- bus->number, devfn, where, size, (unsigned long)val);
+ dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
+ bus->number, devfn, where, size, val);
if (size == 1) {
- shift = 8 * (where & 3);
+ shift = BITS_PER_BYTE * (where & 3);
data &= ~(0xff << shift);
data |= ((val & 0xff) << shift);
} else if (size == 2) {
- shift = 8 * (where & 2);
+ shift = BITS_PER_BYTE * (where & 2);
data &= ~(0xffff << shift);
data |= ((val & 0xffff) << shift);
} else
@@ -507,10 +509,10 @@ static int phy_wait_for_ack(struct rcar_pcie *pcie)
}
static void phy_write_reg(struct rcar_pcie *pcie,
- unsigned int rate, unsigned int addr,
- unsigned int lane, unsigned int data)
+ unsigned int rate, u32 addr,
+ unsigned int lane, u32 data)
{
- unsigned long phyaddr;
+ u32 phyaddr;
phyaddr = WRITE_CMD |
((rate & 1) << RATE_POS) |
@@ -738,15 +740,15 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
while (reg) {
unsigned int index = find_first_bit(&reg, 32);
- unsigned int irq;
+ unsigned int msi_irq;
/* clear the interrupt */
rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);
- irq = irq_find_mapping(msi->domain, index);
- if (irq) {
+ msi_irq = irq_find_mapping(msi->domain, index);
+ if (msi_irq) {
if (test_bit(index, msi->used))
- generic_handle_irq(irq);
+ generic_handle_irq(msi_irq);
else
dev_info(dev, "unhandled MSI\n");
} else {
@@ -890,7 +892,7 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
{
struct device *dev = pcie->dev;
struct rcar_msi *msi = &pcie->msi;
- unsigned long base;
+ phys_addr_t base;
int err, i;
mutex_init(&msi->lock);
@@ -929,10 +931,14 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
/* setup MSI data target */
msi->pages = __get_free_pages(GFP_KERNEL, 0);
+ if (!msi->pages) {
+ err = -ENOMEM;
+ goto err;
+ }
base = virt_to_phys((void *)msi->pages);
- rcar_pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
- rcar_pci_write_reg(pcie, 0, PCIEMSIAUR);
+ rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR);
+ rcar_pci_write_reg(pcie, upper_32_bits(base), PCIEMSIAUR);
/* enable all MSI interrupts */
rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
@@ -1118,7 +1124,7 @@ static int rcar_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rcar_pcie *pcie;
- unsigned int data;
+ u32 data;
int err;
int (*phy_init_fn)(struct rcar_pcie *);
struct pci_host_bridge *bridge;
@@ -1130,6 +1136,7 @@ static int rcar_pcie_probe(struct platform_device *pdev)
pcie = pci_host_bridge_priv(bridge);
pcie->dev = dev;
+ platform_set_drvdata(pdev, pcie);
err = pci_parse_request_of_pci_ranges(dev, &pcie->resources, NULL);
if (err)
@@ -1221,10 +1228,28 @@ err_free_bridge:
return err;
}
+static int rcar_pcie_resume_noirq(struct device *dev)
+{
+ struct rcar_pcie *pcie = dev_get_drvdata(dev);
+
+ if (rcar_pci_read_reg(pcie, PMSR) &&
+ !(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN))
+ return 0;
+
+ /* Re-establish the PCIe link */
+ rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
+ return rcar_pcie_wait_for_dl(pcie);
+}
+
+static const struct dev_pm_ops rcar_pcie_pm_ops = {
+ .resume_noirq = rcar_pcie_resume_noirq,
+};
+
static struct platform_driver rcar_pcie_driver = {
.driver = {
.name = "rcar-pcie",
.of_match_table = rcar_pcie_of_match,
+ .pm = &rcar_pcie_pm_ops,
.suppress_bind_attrs = true,
},
.probe = rcar_pcie_probe,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.