[PATCH v2 3/4] phy: cadence-torrent: Model reference clock driver as a clock to enable derived refclk

Swapnil Jakhade
2021-09-22T12:38:04Z

When reference clock driver is enabled, either derived or received refclk
is output on cmn_refclk_p/m. Update the reference clock driver
implementation by modelling reference clock driver as a "clock" with
derived reference clock set as its default parent. The support for
received reference clock will be added in a separate patch.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
---
drivers/phy/cadence/phy-cadence-torrent.c | 157 ++++++++++++++++++----
1 file changed, 132 insertions(+), 25 deletions(-)

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index ecb1aa883c05..615aca6bd52b 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -235,10 +235,11 @@
#define PHY_PMA_CMN_CTRL2 0x0001U
#define PHY_PMA_PLL_RAW_CTRL 0x0003U

-#define CDNS_TORRENT_OUTPUT_CLOCKS 1
+#define CDNS_TORRENT_OUTPUT_CLOCKS 2

static const char * const clk_names[] = {
[CDNS_TORRENT_REFCLK_DRIVER] = "refclk-driver",
+ [CDNS_TORRENT_DERIVED_REFCLK] = "refclk-der",
};

static const struct reg_field phy_pll_cfg =
@@ -261,10 +262,12 @@ static const struct reg_field phy_pcs_iso_link_ctrl_1 =

static const struct reg_field phy_pipe_cmn_ctrl1_0 = REG_FIELD(PHY_PIPE_CMN_CTRL1, 0, 0);

-#define REFCLK_OUT_NUM_CMN_CONFIG 5
+static const struct reg_field cmn_cdiag_refclk_ovrd_4 =
+ REG_FIELD(CMN_CDIAG_REFCLK_OVRD, 4, 4);
+
+#define REFCLK_OUT_NUM_CMN_CONFIG 4

enum cdns_torrent_refclk_out_cmn {
- CMN_CDIAG_REFCLK_OVRD_4,
CMN_CDIAG_REFCLK_DRV0_CTRL_1,
CMN_CDIAG_REFCLK_DRV0_CTRL_4,
CMN_CDIAG_REFCLK_DRV0_CTRL_5,
@@ -272,7 +275,6 @@ enum cdns_torrent_refclk_out_cmn {
};

static const struct reg_field refclk_out_cmn_cfg[] = {
- [CMN_CDIAG_REFCLK_OVRD_4] = REG_FIELD(CMN_CDIAG_REFCLK_OVRD, 4, 4),
[CMN_CDIAG_REFCLK_DRV0_CTRL_1] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 1, 1),
[CMN_CDIAG_REFCLK_DRV0_CTRL_4] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 4, 4),
[CMN_CDIAG_REFCLK_DRV0_CTRL_5] = REG_FIELD(CMN_CDIAG_REFCLK_DRV0_CTRL, 5, 5),
@@ -330,6 +332,8 @@ struct cdns_torrent_phy {
struct regmap *regmap_phy_pcs_lane_cdb[MAX_NUM_LANES];
struct regmap *regmap_dptx_phy_reg;
struct regmap_field *phy_pll_cfg;
+ struct regmap_field *phy_pipe_cmn_ctrl1_0;
+ struct regmap_field *cmn_cdiag_refclk_ovrd_4;
struct regmap_field *phy_pma_cmn_ctrl_1;
struct regmap_field *phy_pma_cmn_ctrl_2;
struct regmap_field *phy_pma_pll_raw_ctrl;
@@ -345,10 +349,19 @@ enum phy_powerstate {
POWERSTATE_A3 = 3,
};

+struct cdns_torrent_refclk_driver {
+ struct clk_hw hw;
+ struct regmap_field *cmn_fields[REFCLK_OUT_NUM_CMN_CONFIG];
+ struct clk_init_data clk_data;
+};
+
+#define to_cdns_torrent_refclk_driver(_hw) \
+ container_of(_hw, struct cdns_torrent_refclk_driver, hw)
+
struct cdns_torrent_derived_refclk {
struct clk_hw hw;
struct regmap_field *phy_pipe_cmn_ctrl1_0;
- struct regmap_field *cmn_fields[REFCLK_OUT_NUM_CMN_CONFIG];
+ struct regmap_field *cmn_cdiag_refclk_ovrd_4;
struct clk_init_data clk_data;
};

@@ -1618,11 +1631,7 @@ static int cdns_torrent_derived_refclk_enable(struct clk_hw *hw)
{
struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);

- regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_6], 0);
- regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_4], 1);
- regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_5], 1);
- regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_1], 0);
- regmap_field_write(derived_refclk->cmn_fields[CMN_CDIAG_REFCLK_OVRD_4], 1);
+ regmap_field_write(derived_refclk->cmn_cdiag_refclk_ovrd_4, 1);
regmap_field_write(derived_refclk->phy_pipe_cmn_ctrl1_0, 1);

return 0;
@@ -1633,6 +1642,7 @@ static void cdns_torrent_derived_refclk_disable(struct clk_hw *hw)
struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);

regmap_field_write(derived_refclk->phy_pipe_cmn_ctrl1_0, 0);
+ regmap_field_write(derived_refclk->cmn_cdiag_refclk_ovrd_4, 0);
}

static int cdns_torrent_derived_refclk_is_enabled(struct clk_hw *hw)
@@ -1640,7 +1650,7 @@ static int cdns_torrent_derived_refclk_is_enabled(struct clk_hw *hw)
struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);
int val;

- regmap_field_read(derived_refclk->phy_pipe_cmn_ctrl1_0, &val);
+ regmap_field_read(derived_refclk->cmn_cdiag_refclk_ovrd_4, &val);

return !!val;
}
@@ -1655,21 +1665,19 @@ static int cdns_torrent_derived_refclk_register(struct cdns_torrent_phy *cdns_ph
{
struct cdns_torrent_derived_refclk *derived_refclk;
struct device *dev = cdns_phy->dev;
- struct regmap_field *field;
struct clk_init_data *init;
const char *parent_name;
- struct regmap *regmap;
char clk_name[100];
struct clk_hw *hw;
struct clk *clk;
- int i, ret;
+ int ret;

derived_refclk = devm_kzalloc(dev, sizeof(*derived_refclk), GFP_KERNEL);
if (!derived_refclk)
return -ENOMEM;

snprintf(clk_name, sizeof(clk_name), "%s_%s", dev_name(dev),
- clk_names[CDNS_TORRENT_REFCLK_DRIVER]);
+ clk_names[CDNS_TORRENT_DERIVED_REFCLK]);

clk = devm_clk_get_optional(dev, "phy_en_refclk");
if (IS_ERR(clk)) {
@@ -1688,27 +1696,104 @@ static int cdns_torrent_derived_refclk_register(struct cdns_torrent_phy *cdns_ph
init->flags = 0;
init->name = clk_name;

- regmap = cdns_phy->regmap_phy_pcs_common_cdb;
- field = devm_regmap_field_alloc(dev, regmap, phy_pipe_cmn_ctrl1_0);
- if (IS_ERR(field)) {
- dev_err(dev, "phy_pipe_cmn_ctrl1_0 reg field init failed\n");
- return PTR_ERR(field);
+ derived_refclk->phy_pipe_cmn_ctrl1_0 = cdns_phy->phy_pipe_cmn_ctrl1_0;
+ derived_refclk->cmn_cdiag_refclk_ovrd_4 = cdns_phy->cmn_cdiag_refclk_ovrd_4;
+
+ derived_refclk->hw.init = init;
+
+ hw = &derived_refclk->hw;
+ ret = devm_clk_hw_register(dev, hw);
+ if (ret)
+ return ret;
+
+ cdns_phy->clk_hw_data->hws[CDNS_TORRENT_DERIVED_REFCLK] = hw;
+
+ return 0;
+}
+
+static int cdns_torrent_refclk_driver_enable(struct clk_hw *hw)
+{
+ struct cdns_torrent_refclk_driver *refclk_driver = to_cdns_torrent_refclk_driver(hw);
+
+ regmap_field_write(refclk_driver->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_6], 0);
+ regmap_field_write(refclk_driver->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_4], 1);
+ regmap_field_write(refclk_driver->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_5], 1);
+ regmap_field_write(refclk_driver->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_1], 0);
+
+ return 0;
+}
+
+static void cdns_torrent_refclk_driver_disable(struct clk_hw *hw)
+{
+ struct cdns_torrent_refclk_driver *refclk_driver = to_cdns_torrent_refclk_driver(hw);
+
+ regmap_field_write(refclk_driver->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_1], 1);
+}
+
+static int cdns_torrent_refclk_driver_is_enabled(struct clk_hw *hw)
+{
+ struct cdns_torrent_refclk_driver *refclk_driver = to_cdns_torrent_refclk_driver(hw);
+ int val;
+
+ regmap_field_read(refclk_driver->cmn_fields[CMN_CDIAG_REFCLK_DRV0_CTRL_1], &val);
+
+ return !val;
+}
+
+static const struct clk_ops cdns_torrent_refclk_driver_ops = {
+ .enable = cdns_torrent_refclk_driver_enable,
+ .disable = cdns_torrent_refclk_driver_disable,
+ .is_enabled = cdns_torrent_refclk_driver_is_enabled,
+};
+
+static int cdns_torrent_refclk_driver_register(struct cdns_torrent_phy *cdns_phy)
+{
+ struct cdns_torrent_refclk_driver *refclk_driver;
+ struct device *dev = cdns_phy->dev;
+ struct regmap_field *field;
+ struct clk_init_data *init;
+ const char *parent_name;
+ struct regmap *regmap;
+ char clk_name[100];
+ struct clk_hw *hw;
+ int i, ret;
+
+ refclk_driver = devm_kzalloc(dev, sizeof(*refclk_driver), GFP_KERNEL);
+ if (!refclk_driver)
+ return -ENOMEM;
+
+ hw = cdns_phy->clk_hw_data->hws[CDNS_TORRENT_DERIVED_REFCLK];
+ if (IS_ERR_OR_NULL(hw)) {
+ dev_err(dev, "No parent clock for refclk driver clock\n");
+ return IS_ERR(hw) ? PTR_ERR(hw) : -ENOENT;
}
- derived_refclk->phy_pipe_cmn_ctrl1_0 = field;
+ parent_name = clk_hw_get_name(hw);
+
+ snprintf(clk_name, sizeof(clk_name), "%s_%s", dev_name(dev),
+ clk_names[CDNS_TORRENT_REFCLK_DRIVER]);
+
+ init = &refclk_driver->clk_data;
+
+ init->ops = &cdns_torrent_refclk_driver_ops;
+ init->flags = 0;
+ init->parent_names = &parent_name;
+ init->num_parents = 1;
+ init->name = clk_name;

regmap = cdns_phy->regmap_common_cdb;
+
for (i = 0; i < REFCLK_OUT_NUM_CMN_CONFIG; i++) {
field = devm_regmap_field_alloc(dev, regmap, refclk_out_cmn_cfg[i]);
if (IS_ERR(field)) {
- dev_err(dev, "CMN reg field init failed\n");
+ dev_err(dev, "Refclk driver CMN reg field init failed\n");
return PTR_ERR(field);
}
- derived_refclk->cmn_fields[i] = field;
+ refclk_driver->cmn_fields[i] = field;
}

- derived_refclk->hw.init = init;
+ refclk_driver->hw.init = init;

- hw = &derived_refclk->hw;
+ hw = &refclk_driver->hw;
ret = devm_clk_hw_register(dev, hw);
if (ret)
return ret;
@@ -1768,6 +1853,22 @@ static int cdns_torrent_regfield_init(struct cdns_torrent_phy *cdns_phy)
}
cdns_phy->phy_pll_cfg = field;

+ regmap = cdns_phy->regmap_phy_pcs_common_cdb;
+ field = devm_regmap_field_alloc(dev, regmap, phy_pipe_cmn_ctrl1_0);
+ if (IS_ERR(field)) {
+ dev_err(dev, "phy_pipe_cmn_ctrl1_0 reg field init failed\n");
+ return PTR_ERR(field);
+ }
+ cdns_phy->phy_pipe_cmn_ctrl1_0 = field;
+
+ regmap = cdns_phy->regmap_common_cdb;
+ field = devm_regmap_field_alloc(dev, regmap, cmn_cdiag_refclk_ovrd_4);
+ if (IS_ERR(field)) {
+ dev_err(dev, "cmn_cdiag_refclk_ovrd_4 reg field init failed\n");
+ return PTR_ERR(field);
+ }
+ cdns_phy->cmn_cdiag_refclk_ovrd_4 = field;
+
regmap = cdns_phy->regmap_phy_pma_common_cdb;
field = devm_regmap_field_alloc(dev, regmap, phy_pma_cmn_ctrl_1);
if (IS_ERR(field)) {
@@ -2207,6 +2308,12 @@ static int cdns_torrent_clk_register(struct cdns_torrent_phy *cdns_phy)
return ret;
}

+ ret = cdns_torrent_refclk_driver_register(cdns_phy);
+ if (ret) {
+ dev_err(dev, "failed to register refclk driver\n");
+ return ret;
+ }
+
ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, data);
if (ret) {
dev_err(dev, "Failed to add clock provider: %s\n", node->name);