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Merge branch 'remotes/lorenzo/pci/aardvark'

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- Use LTSSM state to build link training flag since Aardvark doesn't
    implement the Link Training bit (Remi Pommarel)

  - Delay before training Aardvark link in case PERST# was asserted before
    the driver probe (Remi Pommarel)

  - Fix Aardvark issues with Root Control reads and writes (Remi Pommarel)

  - Don't rely on jiffies in Aardvark config access path since interrupts
    may be disabled (Remi Pommarel)

  - Fix Aardvark big-endian support (Grzegorz Jaszczyk)

  - Fix bridge emulation big-endian support (Grzegorz Jaszczyk)

* remotes/lorenzo/pci/aardvark:
  PCI: pci-bridge-emul: Fix big-endian support
  PCI: aardvark: Fix big endian support
  PCI: aardvark: Don't rely on jiffies while holding spinlock
  PCI: aardvark: Fix PCI_EXP_RTCTL register configuration
  PCI: aardvark: Wait for endpoint to be ready before training link
  PCI: aardvark: Use LTSSM state to build link training flag
This commit is contained in:
Bjorn Helgaas
2019-11-28 08:54:39 -06:00
parent f52412b151 e0d9d30b73
commit 318ed91f36
3 changed files with 110 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/pci/controller/pci-aardvark.c
View File

@@ -176,11 +176,14 @@
(PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
#define PIO_TIMEOUT_MS 1
#define PIO_RETRY_CNT 500
#define PIO_RETRY_DELAY 2 /* 2 us*/
#define LINK_WAIT_MAX_RETRIES 10
#define LINK_WAIT_USLEEP_MIN 90000
#define LINK_WAIT_USLEEP_MAX 100000
#define RETRAIN_WAIT_MAX_RETRIES 10
#define RETRAIN_WAIT_USLEEP_US 2000
#define MSI_IRQ_NUM 32
@@ -240,6 +243,17 @@ static int advk_pcie_wait_for_link(struct advk_pcie *pcie)
return -ETIMEDOUT;
}
static void advk_pcie_wait_for_retrain(struct advk_pcie *pcie)
{
size_t retries;
for (retries = 0; retries < RETRAIN_WAIT_MAX_RETRIES; ++retries) {
if (!advk_pcie_link_up(pcie))
break;
udelay(RETRAIN_WAIT_USLEEP_US);
}
}
static void advk_pcie_setup_hw(struct advk_pcie *pcie)
{
u32 reg;
@@ -325,6 +339,14 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
reg |= PIO_CTRL_ADDR_WIN_DISABLE;
advk_writel(pcie, reg, PIO_CTRL);
/*
* PERST# signal could have been asserted by pinctrl subsystem before
* probe() callback has been called, making the endpoint going into
* fundamental reset. As required by PCI Express spec a delay for at
* least 100ms after such a reset before link training is needed.
*/
msleep(PCI_PM_D3COLD_WAIT);
/* Start link training */
reg = advk_readl(pcie, PCIE_CORE_LINK_CTRL_STAT_REG);
reg |= PCIE_CORE_LINK_TRAINING;
@@ -384,17 +406,16 @@ static void advk_pcie_check_pio_status(struct advk_pcie *pcie)
static int advk_pcie_wait_pio(struct advk_pcie *pcie)
{
struct device *dev = &pcie->pdev->dev;
unsigned long timeout;
int i;
timeout = jiffies + msecs_to_jiffies(PIO_TIMEOUT_MS);
while (time_before(jiffies, timeout)) {
for (i = 0; i < PIO_RETRY_CNT; i++) {
u32 start, isr;
start = advk_readl(pcie, PIO_START);
isr = advk_readl(pcie, PIO_ISR);
if (!start && isr)
return 0;
udelay(PIO_RETRY_DELAY);
}
dev_err(dev, "config read/write timed out\n");
@@ -416,7 +437,7 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
case PCI_EXP_RTCTL: {
u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
*value = (val & PCIE_MSG_PM_PME_MASK) ? PCI_EXP_RTCTL_PMEIE : 0;
*value = (val & PCIE_MSG_PM_PME_MASK) ? 0 : PCI_EXP_RTCTL_PMEIE;
return PCI_BRIDGE_EMUL_HANDLED;
}
@@ -427,11 +448,20 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
return PCI_BRIDGE_EMUL_HANDLED;
}
case PCI_EXP_LNKCTL: {
/* u32 contains both PCI_EXP_LNKCTL and PCI_EXP_LNKSTA */
u32 val = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg) &
~(PCI_EXP_LNKSTA_LT << 16);
if (!advk_pcie_link_up(pcie))
val |= (PCI_EXP_LNKSTA_LT << 16);
*value = val;
return PCI_BRIDGE_EMUL_HANDLED;
}
case PCI_CAP_LIST_ID:
case PCI_EXP_DEVCAP:
case PCI_EXP_DEVCTL:
case PCI_EXP_LNKCAP:
case PCI_EXP_LNKCTL:
*value = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
return PCI_BRIDGE_EMUL_HANDLED;
default:
@@ -448,15 +478,25 @@ advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
switch (reg) {
case PCI_EXP_DEVCTL:
case PCI_EXP_LNKCTL:
advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
break;
case PCI_EXP_RTCTL:
new = (new & PCI_EXP_RTCTL_PMEIE) << 3;
advk_writel(pcie, new, PCIE_ISR0_MASK_REG);
case PCI_EXP_LNKCTL:
advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
if (new & PCI_EXP_LNKCTL_RL)
advk_pcie_wait_for_retrain(pcie);
break;
case PCI_EXP_RTCTL: {
/* Only mask/unmask PME interrupt */
u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG) &
~PCIE_MSG_PM_PME_MASK;
if ((new & PCI_EXP_RTCTL_PMEIE) == 0)
val |= PCIE_MSG_PM_PME_MASK;
advk_writel(pcie, val, PCIE_ISR0_MASK_REG);
break;
}
case PCI_EXP_RTSTA:
new = (new & PCI_EXP_RTSTA_PME) >> 9;
advk_writel(pcie, new, PCIE_ISR0_REG);
@@ -480,18 +520,20 @@ static void advk_sw_pci_bridge_init(struct advk_pcie *pcie)
{
struct pci_bridge_emul *bridge = &pcie->bridge;
bridge->conf.vendor = advk_readl(pcie, PCIE_CORE_DEV_ID_REG) & 0xffff;
bridge->conf.device = advk_readl(pcie, PCIE_CORE_DEV_ID_REG) >> 16;
bridge->conf.vendor =
cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) & 0xffff);
bridge->conf.device =
cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) >> 16);
bridge->conf.class_revision =
advk_readl(pcie, PCIE_CORE_DEV_REV_REG) & 0xff;
cpu_to_le32(advk_readl(pcie, PCIE_CORE_DEV_REV_REG) & 0xff);
/* Support 32 bits I/O addressing */
bridge->conf.iobase = PCI_IO_RANGE_TYPE_32;
bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32;
/* Support 64 bits memory pref */
bridge->conf.pref_mem_base = PCI_PREF_RANGE_TYPE_64;
bridge->conf.pref_mem_limit = PCI_PREF_RANGE_TYPE_64;
bridge->conf.pref_mem_base = cpu_to_le16(PCI_PREF_RANGE_TYPE_64);
bridge->conf.pref_mem_limit = cpu_to_le16(PCI_PREF_RANGE_TYPE_64);
/* Support interrupt A for MSI feature */
bridge->conf.intpin = PCIE_CORE_INT_A_ASSERT_ENABLE;