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phy: tegra: Add PCIe PIPE2UPHY support for Tegra234

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Synopsys DesignWare core based PCIe controllers in Tegra234 SoC
interface with Universal PHY (UPHY) module through a PIPE2UPHY (P2U)
module. For each PCIe lane of a controller, there is a P2U unit
instantiated at hardware level. This driver provides support for the
programming required for each P2U that is going to be used for a PCIe
controller.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Link: https://lore.kernel.org/r/20220629060435.25297-9-vidyas@nvidia.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Vidya Sagar 2022-06-29 11:34:32 +05:30 committed by Vinod Koul
parent 93134b0a4b
commit de60266825
1 changed files with 47 additions and 1 deletions
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48
drivers/phy/tegra/phy-tegra194-p2u.c
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@ -2,7 +2,7 @@
/*
* P2U (PIPE to UPHY) driver for Tegra T194 SoC
*
* Copyright (C) 2019 NVIDIA Corporation.
* Copyright (C) 2019-2022 NVIDIA Corporation.
*
* Author: Vidya Sagar <vidyas@nvidia.com>
*/
@ -14,6 +14,9 @@
#include <linux/of_platform.h>
#include <linux/phy/phy.h>
#define P2U_CONTROL_CMN 0x74
#define P2U_CONTROL_CMN_SKP_SIZE_PROTECTION_EN BIT(20)
#define P2U_PERIODIC_EQ_CTRL_GEN3 0xc0
#define P2U_PERIODIC_EQ_CTRL_GEN3_PERIODIC_EQ_EN BIT(0)
#define P2U_PERIODIC_EQ_CTRL_GEN3_INIT_PRESET_EQ_TRAIN_EN BIT(1)
@ -24,8 +27,17 @@
#define P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_MASK 0xffff
#define P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_VAL 160
#define P2U_DIR_SEARCH_CTRL 0xd4
#define P2U_DIR_SEARCH_CTRL_GEN4_FINE_GRAIN_SEARCH_TWICE BIT(18)
struct tegra_p2u_of_data {
bool one_dir_search;
};
struct tegra_p2u {
void __iomem *base;
bool skip_sz_protection_en; /* Needed to support two retimers */
struct tegra_p2u_of_data *of_data;
};
static inline void p2u_writel(struct tegra_p2u *phy, const u32 value,
@ -44,6 +56,12 @@ static int tegra_p2u_power_on(struct phy *x)
struct tegra_p2u *phy = phy_get_drvdata(x);
u32 val;
if (phy->skip_sz_protection_en) {
val = p2u_readl(phy, P2U_CONTROL_CMN);
val |= P2U_CONTROL_CMN_SKP_SIZE_PROTECTION_EN;
p2u_writel(phy, val, P2U_CONTROL_CMN);
}
val = p2u_readl(phy, P2U_PERIODIC_EQ_CTRL_GEN3);
val &= ~P2U_PERIODIC_EQ_CTRL_GEN3_PERIODIC_EQ_EN;
val |= P2U_PERIODIC_EQ_CTRL_GEN3_INIT_PRESET_EQ_TRAIN_EN;
@ -58,6 +76,12 @@ static int tegra_p2u_power_on(struct phy *x)
val |= P2U_RX_DEBOUNCE_TIME_DEBOUNCE_TIMER_VAL;
p2u_writel(phy, val, P2U_RX_DEBOUNCE_TIME);
if (phy->of_data->one_dir_search) {
val = p2u_readl(phy, P2U_DIR_SEARCH_CTRL);
val &= ~P2U_DIR_SEARCH_CTRL_GEN4_FINE_GRAIN_SEARCH_TWICE;
p2u_writel(phy, val, P2U_DIR_SEARCH_CTRL);
}
return 0;
}
@ -77,10 +101,19 @@ static int tegra_p2u_probe(struct platform_device *pdev)
if (!phy)
return -ENOMEM;
phy->of_data =
(struct tegra_p2u_of_data *)of_device_get_match_data(dev);
if (!phy->of_data)
return -EINVAL;
phy->base = devm_platform_ioremap_resource_byname(pdev, "ctl");
if (IS_ERR(phy->base))
return PTR_ERR(phy->base);
phy->skip_sz_protection_en =
of_property_read_bool(dev->of_node,
"nvidia,skip-sz-protect-en");
platform_set_drvdata(pdev, phy);
generic_phy = devm_phy_create(dev, NULL, &ops);
@ -96,9 +129,22 @@ static int tegra_p2u_probe(struct platform_device *pdev)
return 0;
}
static const struct tegra_p2u_of_data tegra194_p2u_of_data = {
.one_dir_search = false,
};
static const struct tegra_p2u_of_data tegra234_p2u_of_data = {
.one_dir_search = true,
};
static const struct of_device_id tegra_p2u_id_table[] = {
{
.compatible = "nvidia,tegra194-p2u",
.data = &tegra194_p2u_of_data,
},
{
.compatible = "nvidia,tegra234-p2u",
.data = &tegra234_p2u_of_data,
},
{}
};