From 254627498a39b3908f02513667e710169082efb5 Mon Sep 17 00:00:00 2001
From: Shawn Lin <shawn.lin@rock-chips.com>
Date: Wed, 19 Jul 2017 17:55:14 +0800
Subject: [PATCH 41/86] phy: rockchip-pcie: Reconstruct driver to support
per-lane PHYs
Git-commit: 90a7612d070d5caf023b34864028ccce5bffd6ce
Patch-mainline: v4.14-rc1
References: fate#323912
Reconstruct the whole driver to support per-lane PHYs. Note that we could
also support the legacy PHY if you don't provide argument to
rockchip_pcie_phy_of_xlate().
Tested-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[bhelgaas: use postincrement/decrement when order doesn't matter, uninline
to_pcie_phy() so decl fits on one line]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/phy/rockchip/phy-rockchip-pcie.c | 131 +++++++++++++++++++++++++++----
1 file changed, 117 insertions(+), 14 deletions(-)
diff --git a/drivers/phy/rockchip/phy-rockchip-pcie.c b/drivers/phy/rockchip/phy-rockchip-pcie.c
index 6904633cad68..7cbdde029c0a 100644
--- a/drivers/phy/rockchip/phy-rockchip-pcie.c
+++ b/drivers/phy/rockchip/phy-rockchip-pcie.c
@@ -73,10 +73,38 @@ struct rockchip_pcie_data {
struct rockchip_pcie_phy {
struct rockchip_pcie_data *phy_data;
struct regmap *reg_base;
+ struct phy_pcie_instance {
+ struct phy *phy;
+ u32 index;
+ } phys[PHY_MAX_LANE_NUM];
+ struct mutex pcie_mutex;
struct reset_control *phy_rst;
struct clk *clk_pciephy_ref;
+ int pwr_cnt;
+ int init_cnt;
};
+static struct rockchip_pcie_phy *to_pcie_phy(struct phy_pcie_instance *inst)
+{
+ return container_of(inst, struct rockchip_pcie_phy,
+ phys[inst->index]);
+}
+
+static struct phy *rockchip_pcie_phy_of_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct rockchip_pcie_phy *rk_phy = dev_get_drvdata(dev);
+
+ if (args->args_count == 0)
+ return rk_phy->phys[0].phy;
+
+ if (WARN_ON(args->args[0] >= PHY_MAX_LANE_NUM))
+ return ERR_PTR(-ENODEV);
+
+ return rk_phy->phys[args->args[0]].phy;
+}
+
+
static inline void phy_wr_cfg(struct rockchip_pcie_phy *rk_phy,
u32 addr, u32 data)
{
@@ -116,29 +144,59 @@ static inline u32 phy_rd_cfg(struct rockchip_pcie_phy *rk_phy,
static int rockchip_pcie_phy_power_off(struct phy *phy)
{
- struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+ struct phy_pcie_instance *inst = phy_get_drvdata(phy);
+ struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
int err = 0;
+ mutex_lock(&rk_phy->pcie_mutex);
+
+ regmap_write(rk_phy->reg_base,
+ rk_phy->phy_data->pcie_laneoff,
+ HIWORD_UPDATE(PHY_LANE_IDLE_OFF,
+ PHY_LANE_IDLE_MASK,
+ PHY_LANE_IDLE_A_SHIFT + inst->index));
+
+ if (--rk_phy->pwr_cnt)
+ goto err_out;
+
err = reset_control_assert(rk_phy->phy_rst);
if (err) {
dev_err(&phy->dev, "assert phy_rst err %d\n", err);
- return err;
+ goto err_restore;
}
+err_out:
+ mutex_unlock(&rk_phy->pcie_mutex);
return 0;
+
+err_restore:
+ rk_phy->pwr_cnt++;
+ regmap_write(rk_phy->reg_base,
+ rk_phy->phy_data->pcie_laneoff,
+ HIWORD_UPDATE(!PHY_LANE_IDLE_OFF,
+ PHY_LANE_IDLE_MASK,
+ PHY_LANE_IDLE_A_SHIFT + inst->index));
+ mutex_unlock(&rk_phy->pcie_mutex);
+ return err;
}
static int rockchip_pcie_phy_power_on(struct phy *phy)
{
- struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+ struct phy_pcie_instance *inst = phy_get_drvdata(phy);
+ struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
int err = 0;
u32 status;
unsigned long timeout;
+ mutex_lock(&rk_phy->pcie_mutex);
+
+ if (rk_phy->pwr_cnt++)
+ goto err_out;
+
err = reset_control_deassert(rk_phy->phy_rst);
if (err) {
dev_err(&phy->dev, "deassert phy_rst err %d\n", err);
- return err;
+ goto err_pwr_cnt;
}
regmap_write(rk_phy->reg_base, rk_phy->phy_data->pcie_conf,
@@ -146,6 +204,12 @@ static int rockchip_pcie_phy_power_on(struct phy *phy)
PHY_CFG_ADDR_MASK,
PHY_CFG_ADDR_SHIFT));
+ regmap_write(rk_phy->reg_base,
+ rk_phy->phy_data->pcie_laneoff,
+ HIWORD_UPDATE(!PHY_LANE_IDLE_OFF,
+ PHY_LANE_IDLE_MASK,
+ PHY_LANE_IDLE_A_SHIFT + inst->index));
+
/*
* No documented timeout value for phy operation below,
* so we make it large enough here. And we use loop-break
@@ -214,18 +278,29 @@ static int rockchip_pcie_phy_power_on(struct phy *phy)
goto err_pll_lock;
}
+err_out:
+ mutex_unlock(&rk_phy->pcie_mutex);
return 0;
err_pll_lock:
reset_control_assert(rk_phy->phy_rst);
+err_pwr_cnt:
+ rk_phy->pwr_cnt--;
+ mutex_unlock(&rk_phy->pcie_mutex);
return err;
}
static int rockchip_pcie_phy_init(struct phy *phy)
{
- struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+ struct phy_pcie_instance *inst = phy_get_drvdata(phy);
+ struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
int err = 0;
+ mutex_lock(&rk_phy->pcie_mutex);
+
+ if (rk_phy->init_cnt++)
+ goto err_out;
+
err = clk_prepare_enable(rk_phy->clk_pciephy_ref);
if (err) {
dev_err(&phy->dev, "Fail to enable pcie ref clock.\n");
@@ -238,20 +313,33 @@ static int rockchip_pcie_phy_init(struct phy *phy)
goto err_reset;
}
- return err;
+err_out:
+ mutex_unlock(&rk_phy->pcie_mutex);
+ return 0;
err_reset:
+
clk_disable_unprepare(rk_phy->clk_pciephy_ref);
err_refclk:
+ rk_phy->init_cnt--;
+ mutex_unlock(&rk_phy->pcie_mutex);
return err;
}
static int rockchip_pcie_phy_exit(struct phy *phy)
{
- struct rockchip_pcie_phy *rk_phy = phy_get_drvdata(phy);
+ struct phy_pcie_instance *inst = phy_get_drvdata(phy);
+ struct rockchip_pcie_phy *rk_phy = to_pcie_phy(inst);
+
+ mutex_lock(&rk_phy->pcie_mutex);
+
+ if (--rk_phy->init_cnt)
+ goto err_init_cnt;
clk_disable_unprepare(rk_phy->clk_pciephy_ref);
+err_init_cnt:
+ mutex_unlock(&rk_phy->pcie_mutex);
return 0;
}
@@ -283,10 +371,11 @@ static int rockchip_pcie_phy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rockchip_pcie_phy *rk_phy;
- struct phy *generic_phy;
struct phy_provider *phy_provider;
struct regmap *grf;
const struct of_device_id *of_id;
+ int i;
+ u32 phy_num;
grf = syscon_node_to_regmap(dev->parent->of_node);
if (IS_ERR(grf)) {
@@ -305,6 +394,8 @@ static int rockchip_pcie_phy_probe(struct platform_device *pdev)
rk_phy->phy_data = (struct rockchip_pcie_data *)of_id->data;
rk_phy->reg_base = grf;
+ mutex_init(&rk_phy->pcie_mutex);
+
rk_phy->phy_rst = devm_reset_control_get(dev, "phy");
if (IS_ERR(rk_phy->phy_rst)) {
if (PTR_ERR(rk_phy->phy_rst) != -EPROBE_DEFER)
@@ -319,14 +410,26 @@ static int rockchip_pcie_phy_probe(struct platform_device *pdev)
return PTR_ERR(rk_phy->clk_pciephy_ref);
}
- generic_phy = devm_phy_create(dev, dev->of_node, &ops);
- if (IS_ERR(generic_phy)) {
- dev_err(dev, "failed to create PHY\n");
- return PTR_ERR(generic_phy);
+ /* parse #phy-cells to see if it's legacy PHY model */
+ if (of_property_read_u32(dev->of_node, "#phy-cells", &phy_num))
+ return -ENOENT;
+
+ phy_num = (phy_num == 0) ? 1 : PHY_MAX_LANE_NUM;
+ dev_dbg(dev, "phy number is %d\n", phy_num);
+
+ for (i = 0; i < phy_num; i++) {
+ rk_phy->phys[i].phy = devm_phy_create(dev, dev->of_node, &ops);
+ if (IS_ERR(rk_phy->phys[i].phy)) {
+ dev_err(dev, "failed to create PHY%d\n", i);
+ return PTR_ERR(rk_phy->phys[i].phy);
+ }
+ rk_phy->phys[i].index = i;
+ phy_set_drvdata(rk_phy->phys[i].phy, &rk_phy->phys[i]);
}
- phy_set_drvdata(generic_phy, rk_phy);
- phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ platform_set_drvdata(pdev, rk_phy);
+ phy_provider = devm_of_phy_provider_register(dev,
+ rockchip_pcie_phy_of_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
--
2.11.0