[PATCH v2 2/3] clk: xgene: Add SoC and PMD PLL clocks with v2 hardware

[Loc Ho]

Add X-Gene SoC and PMD PLL clocks support for v2 hardware.
X-Gene SoC v2 and above use an slightly different SoC
and PMD PLL hardware logic.

Signed-off-by: Loc Ho <lho at apm.com>
---
 drivers/clk/clk-xgene.c |  103 ++++++++++++++++++++++++++++++-----------------
 1 files changed, 66 insertions(+), 37 deletions(-)

diff --git a/drivers/clk/clk-xgene.c b/drivers/clk/clk-xgene.c
index 10224b0..266d573 100644
--- a/drivers/clk/clk-xgene.c
+++ b/drivers/clk/clk-xgene.c
@@ -29,7 +29,9 @@
 #include <linux/of_address.h>
 
 /* Register SCU_PCPPLL bit fields */
-#define N_DIV_RD(src)			(((src) & 0x000001ff))
+#define N_DIV_RD(src)			((src) & 0x000001ff)
+#define SC_N_DIV_RD(src)		((src) & 0x0000007f)
+#define SC_OUTDIV2(src)			(((src) & 0x00000100) >> 8)
 
 /* Register SCU_SOCPLL bit fields */
 #define CLKR_RD(src)			(((src) & 0x07000000)>>24)
@@ -63,6 +65,7 @@ struct xgene_clk_pll {
 	spinlock_t	*lock;
 	u32		pll_offset;
 	enum xgene_pll_type	type;
+	int		version;
 };
 
 #define to_xgene_clk_pll(_hw) container_of(_hw, struct xgene_clk_pll, hw)
@@ -92,27 +95,37 @@ static unsigned long xgene_clk_pll_recalc_rate(struct clk_hw *hw,
 
 	pll = xgene_clk_read(pllclk->reg + pllclk->pll_offset);
 
-	if (pllclk->type == PLL_TYPE_PCP) {
-		/*
-		 * PLL VCO = Reference clock * NF
-		 * PCP PLL = PLL_VCO / 2
-		 */
-		nout = 2;
-		fvco = parent_rate * (N_DIV_RD(pll) + 4);
+	if (pllclk->version <= 1) {
+		if (pllclk->type == PLL_TYPE_PCP) {
+			/*
+			* PLL VCO = Reference clock * NF
+			* PCP PLL = PLL_VCO / 2
+			*/
+			nout = 2;
+			fvco = parent_rate * (N_DIV_RD(pll) + 4);
+		} else {
+			/*
+			* Fref = Reference Clock / NREF;
+			* Fvco = Fref * NFB;
+			* Fout = Fvco / NOUT;
+			*/
+			nref = CLKR_RD(pll) + 1;
+			nout = CLKOD_RD(pll) + 1;
+			nfb = CLKF_RD(pll);
+			fref = parent_rate / nref;
+			fvco = fref * nfb;
+		}
 	} else {
 		/*
-		 * Fref = Reference Clock / NREF;
-		 * Fvco = Fref * NFB;
-		 * Fout = Fvco / NOUT;
+		 * fvco = Reference clock * FBDIVC
+		 * PLL freq = fvco / NOUT
 		 */
-		nref = CLKR_RD(pll) + 1;
-		nout = CLKOD_RD(pll) + 1;
-		nfb = CLKF_RD(pll);
-		fref = parent_rate / nref;
-		fvco = fref * nfb;
+		nout = SC_OUTDIV2(pll) ? 2 : 3;
+		fvco = parent_rate * SC_N_DIV_RD(pll);
 	}
-	pr_debug("%s pll recalc rate %ld parent %ld\n", clk_hw_get_name(hw),
-		fvco / nout, parent_rate);
+	pr_debug("%s pll recalc rate %ld parent %ld version %d\n",
+		 clk_hw_get_name(hw), fvco / nout, parent_rate,
+		 pllclk->version);
 
 	return fvco / nout;
 }
@@ -125,7 +138,7 @@ static const struct clk_ops xgene_clk_pll_ops = {
 static struct clk *xgene_register_clk_pll(struct device *dev,
 	const char *name, const char *parent_name,
 	unsigned long flags, void __iomem *reg, u32 pll_offset,
-	u32 type, spinlock_t *lock)
+	u32 type, spinlock_t *lock, int version)
 {
 	struct xgene_clk_pll *apmclk;
 	struct clk *clk;
@@ -144,6 +157,7 @@ static struct clk *xgene_register_clk_pll(struct device *dev,
 	init.parent_names = parent_name ? &parent_name : NULL;
 	init.num_parents = parent_name ? 1 : 0;
 
+	apmclk->version = version;
 	apmclk->reg = reg;
 	apmclk->lock = lock;
 	apmclk->pll_offset = pll_offset;
@@ -160,26 +174,37 @@ static struct clk *xgene_register_clk_pll(struct device *dev,
 	return clk;
 }
 
+static int xgene_pllclk_version(struct device_node *np)
+{
+	if (of_device_is_compatible(np, "apm,xgene-socpll-clock"))
+		return 1;
+	if (of_device_is_compatible(np, "apm,xgene-pcppll-clock"))
+		return 1;
+	return 2;
+}
+
 static void xgene_pllclk_init(struct device_node *np, enum xgene_pll_type pll_type)
 {
-        const char *clk_name = np->full_name;
-        struct clk *clk;
-        void __iomem *reg;
+	const char *clk_name = np->full_name;
+	struct clk *clk;
+	void __iomem *reg;
+	int version = xgene_pllclk_version(np);
 
-        reg = of_iomap(np, 0);
-        if (reg == NULL) {
-                pr_err("Unable to map CSR register for %s\n", np->full_name);
-                return;
-        }
-        of_property_read_string(np, "clock-output-names", &clk_name);
-        clk = xgene_register_clk_pll(NULL,
-                        clk_name, of_clk_get_parent_name(np, 0),
-                        CLK_IS_ROOT, reg, 0, pll_type, &clk_lock);
-        if (!IS_ERR(clk)) {
-                of_clk_add_provider(np, of_clk_src_simple_get, clk);
-                clk_register_clkdev(clk, clk_name, NULL);
-                pr_debug("Add %s clock PLL\n", clk_name);
-        }
+	reg = of_iomap(np, 0);
+	if (reg == NULL) {
+		pr_err("Unable to map CSR register for %s\n", np->full_name);
+		return;
+	}
+	of_property_read_string(np, "clock-output-names", &clk_name);
+	clk = xgene_register_clk_pll(NULL,
+			clk_name, of_clk_get_parent_name(np, 0),
+			CLK_IS_ROOT, reg, 0, pll_type, &clk_lock,
+			version);
+	if (!IS_ERR(clk)) {
+		of_clk_add_provider(np, of_clk_src_simple_get, clk);
+		clk_register_clkdev(clk, clk_name, NULL);
+		pr_debug("Add %s clock PLL\n", clk_name);
+	}
 }
 
 static void xgene_socpllclk_init(struct device_node *np)
@@ -460,7 +485,7 @@ static void __init xgene_devclk_init(struct device_node *np)
 		rc = of_address_to_resource(np, i, &res);
 		if (rc != 0) {
 			if (i == 0) {
-				pr_err("no DTS register for %s\n", 
+				pr_err("no DTS register for %s\n",
 					np->full_name);
 				return;
 			}
@@ -518,4 +543,8 @@ err:
 
 CLK_OF_DECLARE(xgene_socpll_clock, "apm,xgene-socpll-clock", xgene_socpllclk_init);
 CLK_OF_DECLARE(xgene_pcppll_clock, "apm,xgene-pcppll-clock", xgene_pcppllclk_init);
+CLK_OF_DECLARE(xgene_socpll_v2_clock, "apm,xgene-socpll-v2-clock",
+	       xgene_socpllclk_init);
+CLK_OF_DECLARE(xgene_pcppll_v2_clock, "apm,xgene-pcppll-v2-clock",
+	       xgene_pcppllclk_init);
 CLK_OF_DECLARE(xgene_dev_clock, "apm,xgene-device-clock", xgene_devclk_init);
-- 
1.7.1