clk: sifive: Add clock enable and disable ops

Add new functions "sifive_prci_clock_enable(), sifive_prci_clock_disable()
and sifive_clk_is_enabled()" to enable or disable the PRCI clock
Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Tested-by: Zong Li <zong.li@sifive.com>
Link: https://lore.kernel.org/r/20201209094916.17383-6-zong.li@sifive.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/sifive/fu540-prci.c

@@ -27,16 +27,19 @@
 
 static struct __prci_wrpll_data __prci_corepll_data = {
 	.cfg0_offs = PRCI_COREPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_COREPLLCFG1_OFFSET,
 	.enable_bypass = sifive_prci_coreclksel_use_hfclk,
 	.disable_bypass = sifive_prci_coreclksel_use_corepll,
 };
 
 static struct __prci_wrpll_data __prci_ddrpll_data = {
 	.cfg0_offs = PRCI_DDRPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_DDRPLLCFG1_OFFSET,
 };
 
 static struct __prci_wrpll_data __prci_gemgxlpll_data = {
 	.cfg0_offs = PRCI_GEMGXLPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_GEMGXLPLLCFG1_OFFSET,
 };
 
 /* Linux clock framework integration */
@@ -45,6 +48,9 @@ static const struct clk_ops sifive_fu540_prci_wrpll_clk_ops = {
 	.set_rate = sifive_prci_wrpll_set_rate,
 	.round_rate = sifive_prci_wrpll_round_rate,
 	.recalc_rate = sifive_prci_wrpll_recalc_rate,
+	.enable = sifive_prci_clock_enable,
+	.disable = sifive_prci_clock_disable,
+	.is_enabled = sifive_clk_is_enabled,
 };
 
 static const struct clk_ops sifive_fu540_prci_wrpll_ro_clk_ops = {

drivers/clk/sifive/fu740-prci.c

@@ -15,32 +15,38 @@
 
 static struct __prci_wrpll_data __prci_corepll_data = {
 	.cfg0_offs = PRCI_COREPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_COREPLLCFG1_OFFSET,
 	.enable_bypass = sifive_prci_coreclksel_use_hfclk,
 	.disable_bypass = sifive_prci_coreclksel_use_final_corepll,
 };
 
 static struct __prci_wrpll_data __prci_ddrpll_data = {
 	.cfg0_offs = PRCI_DDRPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_DDRPLLCFG1_OFFSET,
 };
 
 static struct __prci_wrpll_data __prci_gemgxlpll_data = {
 	.cfg0_offs = PRCI_GEMGXLPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_GEMGXLPLLCFG1_OFFSET,
 };
 
 static struct __prci_wrpll_data __prci_dvfscorepll_data = {
 	.cfg0_offs = PRCI_DVFSCOREPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_DVFSCOREPLLCFG1_OFFSET,
 	.enable_bypass = sifive_prci_corepllsel_use_corepll,
 	.disable_bypass = sifive_prci_corepllsel_use_dvfscorepll,
 };
 
 static struct __prci_wrpll_data __prci_hfpclkpll_data = {
 	.cfg0_offs = PRCI_HFPCLKPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_HFPCLKPLLCFG1_OFFSET,
 	.enable_bypass = sifive_prci_hfpclkpllsel_use_hfclk,
 	.disable_bypass = sifive_prci_hfpclkpllsel_use_hfpclkpll,
 };
 
 static struct __prci_wrpll_data __prci_cltxpll_data = {
 	.cfg0_offs = PRCI_CLTXPLLCFG0_OFFSET,
+	.cfg1_offs = PRCI_CLTXPLLCFG1_OFFSET,
 };
 
 /* Linux clock framework integration */
@@ -49,6 +55,9 @@ static const struct clk_ops sifive_fu740_prci_wrpll_clk_ops = {
 	.set_rate = sifive_prci_wrpll_set_rate,
 	.round_rate = sifive_prci_wrpll_round_rate,
 	.recalc_rate = sifive_prci_wrpll_recalc_rate,
+	.enable = sifive_prci_clock_enable,
+	.disable = sifive_prci_clock_disable,
+	.is_enabled = sifive_clk_is_enabled,
 };
 
 static const struct clk_ops sifive_fu740_prci_wrpll_ro_clk_ops = {

drivers/clk/sifive/sifive-prci.c

@@ -113,7 +113,7 @@ static u32 __prci_wrpll_pack(const struct wrpll_cfg *c)
 }
 
 /**
- * __prci_wrpll_read_cfg() - read the WRPLL configuration from the PRCI
+ * __prci_wrpll_read_cfg0() - read the WRPLL configuration from the PRCI
  * @pd: PRCI context
  * @pwd: PRCI WRPLL metadata
  *
@@ -124,14 +124,14 @@ static u32 __prci_wrpll_pack(const struct wrpll_cfg *c)
  * Context: Any context.  Caller must prevent the records pointed to by
  *          @pd and @pwd from changing during execution.
  */
-static void __prci_wrpll_read_cfg(struct __prci_data *pd,
-				  struct __prci_wrpll_data *pwd)
+static void __prci_wrpll_read_cfg0(struct __prci_data *pd,
+				   struct __prci_wrpll_data *pwd)
 {
 	__prci_wrpll_unpack(&pwd->c, __prci_readl(pd, pwd->cfg0_offs));
 }
 
 /**
- * __prci_wrpll_write_cfg() - write WRPLL configuration into the PRCI
+ * __prci_wrpll_write_cfg0() - write WRPLL configuration into the PRCI
  * @pd: PRCI context
  * @pwd: PRCI WRPLL metadata
  * @c: WRPLL configuration record to write
@@ -144,15 +144,29 @@ static void __prci_wrpll_read_cfg(struct __prci_data *pd,
  * Context: Any context.  Caller must prevent the records pointed to by
  *          @pd and @pwd from changing during execution.
  */
-static void __prci_wrpll_write_cfg(struct __prci_data *pd,
-				   struct __prci_wrpll_data *pwd,
-				   struct wrpll_cfg *c)
+static void __prci_wrpll_write_cfg0(struct __prci_data *pd,
+				    struct __prci_wrpll_data *pwd,
+				    struct wrpll_cfg *c)
 {
 	__prci_writel(__prci_wrpll_pack(c), pwd->cfg0_offs, pd);
 
 	memcpy(&pwd->c, c, sizeof(*c));
 }
 
+/**
+ * __prci_wrpll_write_cfg1() - write Clock enable/disable configuration
+ * into the PRCI
+ * @pd: PRCI context
+ * @pwd: PRCI WRPLL metadata
+ * @enable: Clock enable or disable value
+ */
+static void __prci_wrpll_write_cfg1(struct __prci_data *pd,
+				    struct __prci_wrpll_data *pwd,
+				    u32 enable)
+{
+	__prci_writel(enable, pwd->cfg1_offs, pd);
+}
+
 /*
  * Linux clock framework integration
  *
@@ -199,16 +213,61 @@ int sifive_prci_wrpll_set_rate(struct clk_hw *hw,
 	if (pwd->enable_bypass)
 		pwd->enable_bypass(pd);
 
-	__prci_wrpll_write_cfg(pd, pwd, &pwd->c);
+	__prci_wrpll_write_cfg0(pd, pwd, &pwd->c);
 
 	udelay(wrpll_calc_max_lock_us(&pwd->c));
 
+	return 0;
+}
+
+int sifive_clk_is_enabled(struct clk_hw *hw)
+{
+	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
+	struct __prci_wrpll_data *pwd = pc->pwd;
+	struct __prci_data *pd = pc->pd;
+	u32 r;
+
+	r = __prci_readl(pd, pwd->cfg1_offs);
+
+	if (r & PRCI_COREPLLCFG1_CKE_MASK)
+		return 1;
+	else
+		return 0;
+}
+
+int sifive_prci_clock_enable(struct clk_hw *hw)
+{
+	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
+	struct __prci_wrpll_data *pwd = pc->pwd;
+	struct __prci_data *pd = pc->pd;
+
+	if (sifive_clk_is_enabled(hw))
+		return 0;
+
+	__prci_wrpll_write_cfg1(pd, pwd, PRCI_COREPLLCFG1_CKE_MASK);
+
 	if (pwd->disable_bypass)
 		pwd->disable_bypass(pd);
 
 	return 0;
 }
 
+void sifive_prci_clock_disable(struct clk_hw *hw)
+{
+	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
+	struct __prci_wrpll_data *pwd = pc->pwd;
+	struct __prci_data *pd = pc->pd;
+	u32 r;
+
+	if (pwd->enable_bypass)
+		pwd->enable_bypass(pd);
+
+	r = __prci_readl(pd, pwd->cfg1_offs);
+	r &= ~PRCI_COREPLLCFG1_CKE_MASK;
+
+	__prci_wrpll_write_cfg1(pd, pwd, r);
+}
+
 /* TLCLKSEL clock integration */
 
 unsigned long sifive_prci_tlclksel_recalc_rate(struct clk_hw *hw,
@@ -427,7 +486,7 @@ static int __prci_register_clocks(struct device *dev, struct __prci_data *pd,
 		pic->pd = pd;
 
 		if (pic->pwd)
-			__prci_wrpll_read_cfg(pd, pic->pwd);
+			__prci_wrpll_read_cfg0(pd, pic->pwd);
 
 		r = devm_clk_hw_register(dev, &pic->hw);
 		if (r) {

drivers/clk/sifive/sifive-prci.h

@@ -40,6 +40,11 @@
 #define PRCI_COREPLLCFG0_LOCK_SHIFT	31
 #define PRCI_COREPLLCFG0_LOCK_MASK	(0x1 << PRCI_COREPLLCFG0_LOCK_SHIFT)
 
+/* COREPLLCFG1 */
+#define PRCI_COREPLLCFG1_OFFSET		0x8
+#define PRCI_COREPLLCFG1_CKE_SHIFT	31
+#define PRCI_COREPLLCFG1_CKE_MASK	(0x1 << PRCI_COREPLLCFG1_CKE_SHIFT)
+
 /* DDRPLLCFG0 */
 #define PRCI_DDRPLLCFG0_OFFSET		0xc
 #define PRCI_DDRPLLCFG0_DIVR_SHIFT	0
@@ -220,6 +225,7 @@ struct __prci_data {
  * @enable_bypass: fn ptr to code to bypass the WRPLL (if applicable; else NULL)
  * @disable_bypass: fn ptr to code to not bypass the WRPLL (or NULL)
  * @cfg0_offs: WRPLL CFG0 register offset (in bytes) from the PRCI base address
+ * @cfg1_offs: WRPLL CFG1 register offset (in bytes) from the PRCI base address
  *
  * @enable_bypass and @disable_bypass are used for WRPLL instances
  * that contain a separate external glitchless clock mux downstream
@@ -230,6 +236,7 @@ struct __prci_wrpll_data {
 	void (*enable_bypass)(struct __prci_data *pd);
 	void (*disable_bypass)(struct __prci_data *pd);
 	u8 cfg0_offs;
+	u8 cfg1_offs;
 };
 
 /**
@@ -279,6 +286,9 @@ long sifive_prci_wrpll_round_rate(struct clk_hw *hw, unsigned long rate,
 				  unsigned long *parent_rate);
 int sifive_prci_wrpll_set_rate(struct clk_hw *hw, unsigned long rate,
 			       unsigned long parent_rate);
+int sifive_clk_is_enabled(struct clk_hw *hw);
+int sifive_prci_clock_enable(struct clk_hw *hw);
+void sifive_prci_clock_disable(struct clk_hw *hw);
 unsigned long sifive_prci_wrpll_recalc_rate(struct clk_hw *hw,
 					    unsigned long parent_rate);
 unsigned long sifive_prci_tlclksel_recalc_rate(struct clk_hw *hw,