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PCI: tegra264: Add PCIe resume support

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Per PCIe r5.0, 6.6.1 wait for 100 ms after DLL up. Optimize PCIe link up
poll logic. Add resume_noirq() callback back function in PCIe driver and
call tegra264_pcie_init() to deassert PERST# and get PCIe link up.
Also, fix minor coding style issues.

Bug 4404453

Change-Id: Iad2d22166eb0c80a20b74ada2ee2766f8d3e174f
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-t264/+/3107413
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
This commit is contained in:
Manikanta Maddireddy
2024-04-02 08:46:08 +00:00
committed by Jon Hunter
parent ef4d11362e
commit f0ec6ab5f5
1 changed files with 36 additions and 24 deletions
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60
drivers/pci/controller/private-soc/pcie-tegra264.c
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@@ -2,7 +2,7 @@
/*
* PCIe host controller driver for Tegra264 SoC
*
* Copyright (c) 2022-2023, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2022-2024, NVIDIA CORPORATION. All rights reserved.
*
* Author: Manikanta Maddireddy <mmaddireddy@nvidia.com>
*/
@@ -10,6 +10,7 @@
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
@@ -25,6 +26,9 @@
#include <drivers-private/pci/k619/pci.h>
#endif
#define PCIE_LINK_UP_DELAY 10000 /* 10 msec */
#define PCIE_LINK_UP_TIMEOUT 1000000 /* 1 s */
/* XAL registers */
#define XAL_RC_MEM_32BIT_BASE_HI 0x1c
#define XAL_RC_MEM_32BIT_BASE_LO 0x20
@@ -95,6 +99,20 @@ static void tegra264_pcie_init(struct tegra264_pcie *pcie)
val = readl(pcie->xtl_pri_base + XTL_RC_MGMT_PERST_CONTROL);
val |= XTL_RC_MGMT_PERST_CONTROL_PERST_O_N;
writel(val, pcie->xtl_pri_base + XTL_RC_MGMT_PERST_CONTROL);
/* Poll every 10 msec for 1 sec to link up */
readl_poll_timeout(pcie->ecam_base + XTL_RC_PCIE_CFG_LINK_CONTROL_STATUS, val,
val & XTL_RC_PCIE_CFG_LINK_CONTROL_STATUS_DLL_ACTIVE,
PCIE_LINK_UP_DELAY, PCIE_LINK_UP_TIMEOUT);
if (val & XTL_RC_PCIE_CFG_LINK_CONTROL_STATUS_DLL_ACTIVE) {
/* Per PCIe r5.0, 6.6.1 wait for 100ms after DLL up */
msleep(100);
dev_info(pcie->dev, "PCIe Controller-%d Link is UP (Speed: %d)\n",
pcie->ctl_id, (val & 0xf0000) >> 16);
} else {
dev_info(pcie->dev, "PCIe Controller-%d Link is DOWN\r\n", pcie->ctl_id);
}
}
static int tegra264_pcie_probe(struct platform_device *pdev)
@@ -105,7 +123,6 @@ static int tegra264_pcie_probe(struct platform_device *pdev)
struct resource_entry *bus;
struct resource_entry *entry;
struct resource *res;
u32 val, count;
int ret = 0;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct tegra264_pcie));
@@ -133,7 +150,7 @@ static int tegra264_pcie_probe(struct platform_device *pdev)
}
}
ret = of_get_pci_domain_nr(pcie->dev->of_node);
ret = of_get_pci_domain_nr(dev->of_node);
if (ret < 0) {
dev_err(dev, "failed to get domain number: %d\n", ret);
return ret;
@@ -174,29 +191,10 @@ static int tegra264_pcie_probe(struct platform_device *pdev)
bridge->ops = (struct pci_ops *)&pci_generic_ecam_ops.pci_ops;
bridge->sysdata = pcie->cfg;
pcie->ecam_base = pcie->cfg->win;
pcie->ecam_base = pcie->cfg->win;
tegra264_pcie_init(pcie);
msleep(100);
/* Wait for link up */
count = 0;
do {
usleep_range(10, 20);
val = readl(pcie->ecam_base + XTL_RC_PCIE_CFG_LINK_CONTROL_STATUS);
if (val & XTL_RC_PCIE_CFG_LINK_CONTROL_STATUS_DLL_ACTIVE) {
dev_info(dev, "PCIe Controller-%d Link is UP (Speed: %d)\n",
pcie->ctl_id, (val & 0xf0000) >> 16);
break;
}
count++;
} while (count < 10000);
if (!(val & XTL_RC_PCIE_CFG_LINK_CONTROL_STATUS_DLL_ACTIVE))
dev_info(dev, "PCIe Controller-%d Link is DOWN\r\n", pcie->ctl_id);
ret = pci_host_probe(bridge);
if (ret < 0) {
dev_err(dev, "failed to register host: %d\n", ret);
@@ -207,6 +205,19 @@ static int tegra264_pcie_probe(struct platform_device *pdev)
return ret;
}
static int tegra264_pcie_resume_noirq(struct device *dev)
{
struct tegra264_pcie *pcie = dev_get_drvdata(dev);
tegra264_pcie_init(pcie);
return 0;
}
static const struct dev_pm_ops tegra264_pcie_pm_ops = {
.resume_noirq = tegra264_pcie_resume_noirq,
};
static const struct of_device_id tegra264_pcie_of_match[] = {
{
.compatible = "nvidia,tegra264-pcie",
@@ -217,7 +228,8 @@ static const struct of_device_id tegra264_pcie_of_match[] = {
static struct platform_driver tegra264_pcie_driver = {
.probe = tegra264_pcie_probe,
.driver = {
.name = "tegra264-pcie",
.name = "tegra264-pcie",
.pm = &tegra264_pcie_pm_ops,
.of_match_table = tegra264_pcie_of_match,
},
};