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Subject[PATCH 7/9] phy: cadence: sierra: Model reference receiver as clocks (gate clocks)
Date
Sierra has two reference recievers REFRCV and REFRCV1. REFRCV is used to
drive reference clock cmn_refclk_m/p to PLL_CMNLC1 and REFRCV1 is used to
drive reference clock cmn_refclk1_m/p to PLL_CMNLC. Model these
reference receivers as clocks in order for PLL_CMNLC and PLL_CMNLC1 to
be able to seamlessly use any of the external reference clocks.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/phy/cadence/phy-cadence-sierra.c | 177 +++++++++++++++++++++++
1 file changed, 177 insertions(+)

diff --git a/drivers/phy/cadence/phy-cadence-sierra.c b/drivers/phy/cadence/phy-cadence-sierra.c
index 145e42837b7b..ab7a3e2795cd 100644
--- a/drivers/phy/cadence/phy-cadence-sierra.c
+++ b/drivers/phy/cadence/phy-cadence-sierra.c
@@ -7,6 +7,7 @@
*
*/
#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
@@ -31,6 +32,8 @@
#define SIERRA_CMN_PLLLC_BWCAL_MODE1_PREG 0x4F
#define SIERRA_CMN_PLLLC_BWCAL_MODE0_PREG 0x50
#define SIERRA_CMN_PLLLC_SS_TIME_STEPSIZE_MODE_PREG 0x62
+#define SIERRA_CMN_REFRCV_PREG 0x98
+#define SIERRA_CMN_REFRCV1_PREG 0xB8

#define SIERRA_LANE_CDB_OFFSET(ln, block_offset, reg_offset) \
((0x4000 << (block_offset)) + \
@@ -151,6 +154,35 @@ static const struct reg_field phy_pll_cfg_1 =
static const struct reg_field pllctrl_lock =
REG_FIELD(SIERRA_PLLCTRL_STATUS_PREG, 0, 0);

+enum cdns_sierra_cmn_refrcv {
+ CMN_REFRCV,
+ CMN_REFRCV1,
+};
+
+#define SIERRA_NUM_REFRCV 0x2
+
+static const struct reg_field cmn_refrcv_refclk_plllc1en_preg[] = {
+ [CMN_REFRCV] = REG_FIELD(SIERRA_CMN_REFRCV_PREG, 8, 8),
+ [CMN_REFRCV1] = REG_FIELD(SIERRA_CMN_REFRCV1_PREG, 8, 8),
+};
+
+static const struct reg_field cmn_refrcv_refclk_termen_preg[] = {
+ [CMN_REFRCV] = REG_FIELD(SIERRA_CMN_REFRCV_PREG, 0, 0),
+ [CMN_REFRCV1] = REG_FIELD(SIERRA_CMN_REFRCV1_PREG, 0, 0),
+};
+
+static char *refrcv_node_name[] = { "refrcv", "refrcv1" };
+
+struct cdns_sierra_refrcv {
+ struct clk_hw hw;
+ struct regmap_field *plllc1en_field;
+ struct regmap_field *termen_field;
+ struct clk_init_data clk_data;
+};
+
+#define to_cdns_sierra_refrcv(_hw) \
+ container_of(_hw, struct cdns_sierra_refrcv, hw)
+
struct cdns_sierra_inst {
struct phy *phy;
u32 phy_type;
@@ -197,6 +229,8 @@ struct cdns_sierra_phy {
struct regmap_field *macro_id_type;
struct regmap_field *phy_pll_cfg_1;
struct regmap_field *pllctrl_lock[SIERRA_MAX_LANES];
+ struct regmap_field *cmn_refrcv_refclk_plllc1en_preg[SIERRA_NUM_REFRCV];
+ struct regmap_field *cmn_refrcv_refclk_termen_preg[SIERRA_NUM_REFRCV];
struct clk *clk;
struct clk *cmn_refclk_dig_div;
struct clk *cmn_refclk1_dig_div;
@@ -368,6 +402,93 @@ static const struct phy_ops noop_ops = {
.owner = THIS_MODULE,
};

+static int cdns_sierra_refrcv_enable(struct clk_hw *hw)
+{
+ struct cdns_sierra_refrcv *refrcv = to_cdns_sierra_refrcv(hw);
+ struct regmap_field *plllc1en_field = refrcv->plllc1en_field;
+ struct regmap_field *termen_field = refrcv->termen_field;
+
+ regmap_field_write(plllc1en_field, 1);
+ regmap_field_write(termen_field, 1);
+
+ return 0;
+}
+
+static void cdns_sierra_refrcv_disable(struct clk_hw *hw)
+{
+ struct cdns_sierra_refrcv *refrcv = to_cdns_sierra_refrcv(hw);
+ struct regmap_field *plllc1en_field = refrcv->plllc1en_field;
+ struct regmap_field *termen_field = refrcv->termen_field;
+
+ regmap_field_write(plllc1en_field, 0);
+ regmap_field_write(termen_field, 0);
+}
+
+static int cdns_sierra_refrcv_is_enabled(struct clk_hw *hw)
+{
+ struct cdns_sierra_refrcv *refrcv = to_cdns_sierra_refrcv(hw);
+ struct regmap_field *plllc1en_field = refrcv->plllc1en_field;
+ int val;
+
+ regmap_field_read(plllc1en_field, &val);
+
+ return !!val;
+}
+
+static const struct clk_ops cdns_sierra_refrcv_ops = {
+ .enable = cdns_sierra_refrcv_enable,
+ .disable = cdns_sierra_refrcv_disable,
+ .is_enabled = cdns_sierra_refrcv_is_enabled,
+};
+
+static int cdns_sierra_refrcv_register(struct cdns_sierra_phy *sp,
+ struct device_node *node,
+ struct regmap_field *plllc1en_field,
+ struct regmap_field *termen_field)
+{
+ struct cdns_sierra_refrcv *refrcv;
+ struct device *dev = sp->dev;
+ struct clk_init_data *init;
+ unsigned int num_parents;
+ const char *parent_name;
+ char clk_name[100];
+ struct clk *clk;
+ int ret;
+
+ refrcv = devm_kzalloc(dev, sizeof(*refrcv), GFP_KERNEL);
+ if (!refrcv)
+ return -ENOMEM;
+
+ num_parents = of_clk_get_parent_count(node);
+ parent_name = of_clk_get_parent_name(node, 0);
+
+ snprintf(clk_name, sizeof(clk_name), "%s_%s", dev_name(dev),
+ node->name);
+
+ init = &refrcv->clk_data;
+
+ init->ops = &cdns_sierra_refrcv_ops;
+ init->flags = 0;
+ init->parent_names = parent_name ? &parent_name : NULL;
+ init->num_parents = num_parents ? 1 : 0;
+ init->name = clk_name;
+
+ refrcv->plllc1en_field = plllc1en_field;
+ refrcv->termen_field = termen_field;
+ refrcv->hw.init = init;
+
+ clk = devm_clk_register(dev, &refrcv->hw);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ if (ret)
+ dev_err(dev, "Failed to add refrcv clock provider: %s\n",
+ clk_name);
+
+ return ret;
+}
+
static int cdns_sierra_get_optional(struct cdns_sierra_inst *inst,
struct device_node *child)
{
@@ -406,6 +527,7 @@ static int cdns_regfield_init(struct cdns_sierra_phy *sp)
{
struct device *dev = sp->dev;
struct regmap_field *field;
+ struct reg_field reg_field;
struct regmap *regmap;
int i;

@@ -417,6 +539,24 @@ static int cdns_regfield_init(struct cdns_sierra_phy *sp)
}
sp->macro_id_type = field;

+ for (i = 0; i < SIERRA_NUM_REFRCV; i++) {
+ reg_field = cmn_refrcv_refclk_plllc1en_preg[i];
+ field = devm_regmap_field_alloc(dev, regmap, reg_field);
+ if (IS_ERR(field)) {
+ dev_err(dev, "REFRCV%d_REFCLK_PLLLC1EN failed\n", i);
+ return PTR_ERR(field);
+ }
+ sp->cmn_refrcv_refclk_plllc1en_preg[i] = field;
+
+ reg_field = cmn_refrcv_refclk_termen_preg[i];
+ field = devm_regmap_field_alloc(dev, regmap, reg_field);
+ if (IS_ERR(field)) {
+ dev_err(dev, "REFRCV%d_REFCLK_TERMEN failed\n", i);
+ return PTR_ERR(field);
+ }
+ sp->cmn_refrcv_refclk_termen_preg[i] = field;
+ }
+
regmap = sp->regmap_phy_config_ctrl;
field = devm_regmap_field_alloc(dev, regmap, phy_pll_cfg_1);
if (IS_ERR(field)) {
@@ -481,6 +621,38 @@ static int cdns_regmap_init_blocks(struct cdns_sierra_phy *sp,
return 0;
}

+static int cdns_sierra_phy_register_refrcv(struct cdns_sierra_phy *sp,
+ struct device_node *dn)
+{
+ struct regmap_field *plllc1en_field;
+ struct device_node *of_node = NULL;
+ struct regmap_field *termen_field;
+ struct device *dev = sp->dev;
+ int ret = 0, i;
+
+ for (i = 0; i < SIERRA_NUM_REFRCV; i++) {
+ of_node = of_get_child_by_name(dn, refrcv_node_name[i]);
+ if (!of_node)
+ return 0;
+
+ plllc1en_field = sp->cmn_refrcv_refclk_plllc1en_preg[i];
+ termen_field = sp->cmn_refrcv_refclk_termen_preg[i];
+
+ ret = cdns_sierra_refrcv_register(sp, of_node, plllc1en_field,
+ termen_field);
+ if (ret) {
+ dev_err(dev, "Fail to register reference receiver %s\n",
+ refrcv_node_name[i]);
+ goto err;
+ }
+ }
+
+err:
+ of_node_put(of_node);
+
+ return ret;
+}
+
static int cdns_sierra_phy_get_clocks(struct cdns_sierra_phy *sp,
struct device *dev)
{
@@ -582,6 +754,10 @@ static int cdns_sierra_phy_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, sp);

if (!already_configured) {
+ ret = cdns_sierra_phy_register_refrcv(sp, dn);
+ if (ret)
+ return ret;
+
ret = cdns_sierra_phy_get_clocks(sp, dev);
if (ret)
return ret;
@@ -589,6 +765,7 @@ static int cdns_sierra_phy_probe(struct platform_device *pdev)
ret = clk_prepare_enable(sp->clk);
if (ret)
return ret;
+
/* Enable APB */
reset_control_deassert(sp->apb_rst);

--
2.17.1
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