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PCI: mvebu: Fix macro names and comments about legacy interrupts

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Register 0x1910 unmasks interrupts and legacy INTx interrupts are unmasked
because driver does not support individual masking yet.

Link: https://lore.kernel.org/r/20220222155030.988-11-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Pali Rohár 2022-02-22 16:50:28 +01:00 committed by Lorenzo Pieralisi
parent 0124989220
commit d00ea94e62
1 changed files with 18 additions and 8 deletions
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26
drivers/pci/controller/pci-mvebu.c
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@ -54,9 +54,10 @@
PCIE_CONF_ADDR_EN)
#define PCIE_CONF_DATA_OFF 0x18fc
#define PCIE_INT_CAUSE_OFF 0x1900
#define PCIE_INT_UNMASK_OFF 0x1910
#define PCIE_INT_INTX(i) BIT(24+i)
#define PCIE_INT_PM_PME BIT(28)
#define PCIE_MASK_OFF 0x1910
#define PCIE_MASK_ENABLE_INTS 0x0f000000
#define PCIE_INT_ALL_MASK GENMASK(31, 0)
#define PCIE_CTRL_OFF 0x1a00
#define PCIE_CTRL_X1_MODE 0x0001
#define PCIE_CTRL_RC_MODE BIT(1)
@ -235,7 +236,7 @@ static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
{
u32 ctrl, lnkcap, cmd, dev_rev, mask;
u32 ctrl, lnkcap, cmd, dev_rev, unmask;
/* Setup PCIe controller to Root Complex mode. */
ctrl = mvebu_readl(port, PCIE_CTRL_OFF);
@ -288,10 +289,19 @@ static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
/* Point PCIe unit MBUS decode windows to DRAM space. */
mvebu_pcie_setup_wins(port);
/* Enable interrupt lines A-D. */
mask = mvebu_readl(port, PCIE_MASK_OFF);
mask |= PCIE_MASK_ENABLE_INTS;
mvebu_writel(port, mask, PCIE_MASK_OFF);
/*
* Unmask all legacy INTx interrupts as driver does not provide a way
* for masking and unmasking of individual legacy INTx interrupts.
* Legacy INTx are reported via one shared GIC source and therefore
* kernel cannot distinguish which individual legacy INTx was triggered.
* These interrupts are shared, so it should not cause any issue. Just
* performance penalty as every PCIe interrupt handler needs to be
* called when some interrupt is triggered.
*/
unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF);
unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) |
PCIE_INT_INTX(2) | PCIE_INT_INTX(3);
mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF);
}
static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
@ -1450,7 +1460,7 @@ static int mvebu_pcie_remove(struct platform_device *pdev)
mvebu_writel(port, cmd, PCIE_CMD_OFF);
/* Mask all interrupt sources. */
mvebu_writel(port, 0, PCIE_MASK_OFF);
mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_UNMASK_OFF);
/* Free config space for emulated root bridge. */
pci_bridge_emul_cleanup(&port->bridge);