[PATCH v5 3/7] phy: rockcip-pcie: reconstruct driver to support per-lane PHYs
Shawn Lin
shawn.lin at rock-chips.com
Wed Jul 19 02:55:14 PDT 2017
This patch reconstructs the whole driver to support per-lane
PHYs. Note that we could also support the legacy PHY if you
don't provide argument to our of_xlate.
Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
Reviewed-by: Brian Norris <briannorris at chromium.org>
Tested-by: Jeffy Chen <jeffy.chen at rock-chips.com>
---
Changes in v5:
- don't create more number of phys if it's legacy PHY model
Changes in v4: None
Changes in v3:
- remove unnecessary forward declaration
- keep mutex inside struct rockchip_pcie_phy
- fix wrong check of args number
- move de-idle lanes after deasserting the reset
Changes in v2:
- deprecate legacy PHY model
- improve rockchip_pcie_phy_of_xlate
- fix wrong calculation of pwr_cnt and add new init_cnt
- add internal locking
- introduce per-lane data to simply the code
drivers/phy/rockchip/phy-rockchip-pcie.c | 132 +++++++++++++++++++++++++++----
1 file changed, 118 insertions(+), 14 deletions(-)
diff --git a/drivers/phy/rockchip/phy-rockchip-pcie.c b/drivers/phy/rockchip/phy-rockchip-pcie.c
index 6904633..550499e 100644
--- a/drivers/phy/rockchip/phy-rockchip-pcie.c
+++ b/drivers/phy/rockchip/phy-rockchip-pcie.c
@@ -73,10 +73,39 @@ 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 inline
+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 +145,59 @@ 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 +205,12 @@ 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 +279,29 @@ 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 +314,33 @@ 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 +372,11 @@ 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 +395,8 @@ 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 +411,26 @@ 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);
}
--
1.9.1
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