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PCIe: rockchip: Add more legacy int support

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Some vendor drivers rely on flow control by toggling
enable/disable virtual irq if using legacy interrupt.
It can certainly change the behaviour by function
drivers, but adding corresponding operations would make
RC driver more flexible.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Change-Id: Idf3e6a0ca9c4ebde369745713a88db53e3f72ea5
This commit is contained in:
Shawn Lin
2021-11-16 10:42:50 +08:00
committed by Tao Huang
parent 1933399fa0
commit ee99fe07a7
1 changed files with 35 additions and 1 deletions
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36
drivers/pci/controller/dwc/pcie-dw-rockchip.c
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@@ -101,6 +101,8 @@ struct reset_bulk_data {
#define PCIE_CLIENT_INTR_STATUS_MISC 0x10
#define PCIE_CLIENT_INTR_MASK_LEGACY 0x1c
#define UNMASK_ALL_LEGACY_INT 0xffff0000
#define MASK_LEGACY_INT(x) (0x00110011 << x)
#define UNMASK_LEGACY_INT(x) (0x00110000 << x)
#define PCIE_CLIENT_INTR_MASK 0x24
#define PCIE_CLIENT_GENERAL_DEBUG 0x104
#define PCIE_CLIENT_HOT_RESET_CTRL 0x180
@@ -156,6 +158,7 @@ struct rk_pcie {
bool bifurcation;
struct regulator *vpcie3v3;
struct irq_domain *irq_domain;
raw_spinlock_t intx_lock;
};
struct rk_pcie_of_data {
@@ -1490,10 +1493,41 @@ static void rk_pcie_fast_link_setup(struct rk_pcie *rk_pcie)
rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_HOT_RESET_CTRL, val);
}
static void rk_pcie_legacy_irq_mask(struct irq_data *d)
{
struct rk_pcie *rk_pcie = irq_data_get_irq_chip_data(d);
unsigned long flags;
raw_spin_lock_irqsave(&rk_pcie->intx_lock, flags);
rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_INTR_MASK_LEGACY,
MASK_LEGACY_INT(d->hwirq));
raw_spin_unlock_irqrestore(&rk_pcie->intx_lock, flags);
}
static void rk_pcie_legacy_irq_unmask(struct irq_data *d)
{
struct rk_pcie *rk_pcie = irq_data_get_irq_chip_data(d);
unsigned long flags;
raw_spin_lock_irqsave(&rk_pcie->intx_lock, flags);
rk_pcie_writel_apb(rk_pcie, PCIE_CLIENT_INTR_MASK_LEGACY,
UNMASK_LEGACY_INT(d->hwirq));
raw_spin_unlock_irqrestore(&rk_pcie->intx_lock, flags);
}
static struct irq_chip rk_pcie_legacy_irq_chip = {
.name = "rk-pcie-legacy-int",
.irq_enable = rk_pcie_legacy_irq_unmask,
.irq_disable = rk_pcie_legacy_irq_mask,
.irq_mask = rk_pcie_legacy_irq_mask,
.irq_unmask = rk_pcie_legacy_irq_unmask,
.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
};
static int rk_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
irq_hw_number_t hwirq)
{
irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
irq_set_chip_and_handler(irq, &rk_pcie_legacy_irq_chip, handle_simple_irq);
irq_set_chip_data(irq, domain->host_data);
return 0;