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pci: pci_mvebu: Add support for reset-gpios

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Release PERST# signal via GPIO when "reset-gpios" is defined in device tree.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár
2022-08-05 16:03:41 +02:00
committed by Stefan Roese
parent 019090647c
commit ca3756c86b
2 changed files with 15 additions and 0 deletions
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1
drivers/pci/Kconfig
View File

@@ -301,6 +301,7 @@ config PCI_MVEBU
depends on (ARCH_KIRKWOOD || ARCH_MVEBU)
select MISC
select DM_RESET
select DM_GPIO
help
Say Y here if you want to enable PCIe controller support on
Kirkwood and Armada 370/XP/375/38x SoCs.

14
drivers/pci/pci_mvebu.c
View File

@@ -22,6 +22,7 @@
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <asm/gpio.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/errno.h>
@@ -60,6 +61,7 @@ struct mvebu_pcie {
struct resource mem;
void __iomem *iobase;
struct resource io;
struct gpio_desc reset_gpio;
u32 intregs;
u32 port;
u32 lane;
@@ -416,6 +418,14 @@ static int mvebu_pcie_probe(struct udevice *dev)
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
u32 reg;
int ret;
/* Request for optional PERST# GPIO */
ret = gpio_request_by_name(dev, "reset-gpios", 0, &pcie->reset_gpio, GPIOD_IS_OUT);
if (ret && ret != -ENOENT) {
printf("%s: unable to request reset-gpios: %d\n", pcie->name, ret);
return ret;
}
/*
* Change Class Code of PCI Bridge device to PCI Bridge (0x600400)
@@ -537,6 +547,10 @@ static int mvebu_pcie_probe(struct udevice *dev)
pcie->cfgcache[(PCI_PREF_MEMORY_BASE - 0x10) / 4] =
PCI_PREF_RANGE_TYPE_64 | (PCI_PREF_RANGE_TYPE_64 << 16);
/* Release PERST# via GPIO when it was defined */
if (dm_gpio_is_valid(&pcie->reset_gpio))
dm_gpio_set_value(&pcie->reset_gpio, 0);
mvebu_pcie_wait_for_link(pcie);
return 0;