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pci: imx: use reset-gpios if defined by device-tree

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If reset-gpio is defined by device-tree use that if
CONFIG_PCIE_IMX_PERST_GPIO is not defined.

Note that after this the following boards which define
CONFIG_PCIE_IMX_PERST_GPIO in their board header file as well as their
device-tree should be able to remove CONFIG_PCIE_IMX_PERST_GPIO without
consequence:
 - mx6sabresd
 - mx6sxsabresd
 - novena
 - tbs2910
 - vining_2000

Note that the ge_bx50v3 board uses CONFIG_PCIE_IMX_PERST_GPIO and does
not have reset-gpios defined it it's pcie node in the dt thus removing
CONFIG_PCIE_IMX_PERST_GPIO globally can't be done until that board adds
reset-gpios.

Cc: Ian Ray <ian.ray@ge.com> (maintainer:GE BX50V3 BOARD)
Cc: Sebastian Reichel <sebastian.reichel@collabora.com> (maintainer:GE BX50V3 BOARD)
Cc: Fabio Estevam <festevam@gmail.com> (maintainer:MX6SABRESD BOARD)
Cc: Marek Vasut <marex@denx.de> (maintainer:NOVENA BOARD)
Cc: Soeren Moch <smoch@web.de> (maintainer:TBS2910 BOARD)
Cc: Silvio Fricke <open-source@softing.de> (maintainer:VINING_2000 BOARD)
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Tim Harvey 2021-07-06 10:19:09 -07:00 • committed by Stefano Babic
parent 96f747b1f0
commit c1f6fd2bb7
3 changed files with 27 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/arm/include/asm/arch-mx6/sys_proto.h
View file

@ -7,6 +7,7 @@
#ifndef __SYS_PROTO_IMX6_
#define __SYS_PROTO_IMX6_
#include <asm/gpio.h>
#include <asm/mach-imx/sys_proto.h>
#include <asm/arch/iomux.h>
@ -18,7 +19,7 @@
USBPHY_PWD_RXPWDRX))
int imx6_pcie_toggle_power(void);
int imx6_pcie_toggle_reset(void);
int imx6_pcie_toggle_reset(struct gpio_desc *gpio, bool active_high);
enum ldo_reg {
LDO_ARM,

2
board/gateworks/gw_ventana/gw_ventana.c
View file

@ -372,7 +372,7 @@ int power_init_board(void)
return 0;
}
int imx6_pcie_toggle_reset(void)
int imx6_pcie_toggle_reset(struct gpio_desc *gpio, bool active_high)
{
if (board_type < GW_UNKNOWN) {
uint pin = gpio_cfg[board_type].pcie_rst;

29
drivers/pci/pcie_imx.c
View file

@ -100,6 +100,8 @@
struct imx_pcie_priv {
void __iomem *dbi_base;
void __iomem *cfg_base;
struct gpio_desc reset_gpio;
bool reset_active_high;
};
/*
@ -541,7 +543,7 @@ __weak int imx6_pcie_toggle_power(void)
return 0;
}
__weak int imx6_pcie_toggle_reset(void)
__weak int imx6_pcie_toggle_reset(struct gpio_desc *gpio, bool active_high)
{
/*
* See 'PCI EXPRESS BASE SPECIFICATION, REV 3.0, SECTION 6.6.1'
@ -579,12 +581,20 @@ __weak int imx6_pcie_toggle_reset(void)
mdelay(20);
gpio_free(CONFIG_PCIE_IMX_PERST_GPIO);
#else
puts("WARNING: Make sure the PCIe #PERST line is connected!\n");
if (dm_gpio_is_valid(gpio)) {
/* Assert PERST# for 20ms then de-assert */
dm_gpio_set_value(gpio, active_high ? 0 : 1);
mdelay(20);
dm_gpio_set_value(gpio, active_high ? 1 : 0);
mdelay(20);
} else {
puts("WARNING: Make sure the PCIe #PERST line is connected!\n");
}
#endif
return 0;
}
static int imx6_pcie_deassert_core_reset(void)
static int imx6_pcie_deassert_core_reset(struct imx_pcie_priv *priv)
{
struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
@ -612,7 +622,7 @@ static int imx6_pcie_deassert_core_reset(void)
setbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_REF_SSP_EN);
#endif
imx6_pcie_toggle_reset();
imx6_pcie_toggle_reset(&priv->reset_gpio, priv->reset_active_high);
return 0;
}
@ -625,7 +635,7 @@ static int imx_pcie_link_up(struct imx_pcie_priv *priv)
imx6_pcie_assert_core_reset(priv, false);
imx6_pcie_init_phy();
imx6_pcie_deassert_core_reset();
imx6_pcie_deassert_core_reset(priv);
imx_pcie_regions_setup(priv);
@ -787,6 +797,15 @@ static int imx_pcie_dm_probe(struct udevice *dev)
{
struct imx_pcie_priv *priv = dev_get_priv(dev);
/* if PERST# valid from dt then assert it */
gpio_request_by_name(dev, "reset-gpio", 0, &priv->reset_gpio,
GPIOD_IS_OUT);
priv->reset_active_high = dev_read_bool(dev, "reset-gpio-active-high");
if (dm_gpio_is_valid(&priv->reset_gpio)) {
dm_gpio_set_value(&priv->reset_gpio,
priv->reset_active_high ? 0 : 1);
}
return imx_pcie_link_up(priv);
}