Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 344 insertions, 0 deletions

diff --git a/drivers/clk/mvebu/kirkwood.c b/drivers/clk/mvebu/kirkwood.c
new file mode 100644
index 000000000..38612cd90
--- /dev/null
+++ b/drivers/clk/mvebu/kirkwood.c
@@ -0,0 +1,344 @@
+/*
+ * Marvell Kirkwood SoC clocks
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include "common.h"
+
+/*
+ * Core Clocks
+ *
+ * Kirkwood PLL sample-at-reset configuration
+ * (6180 has different SAR layout than other Kirkwood SoCs)
+ *
+ * SAR0[4:3,22,1] : CPU frequency (6281,6292,6282)
+ *	4  =  600 MHz
+ *	6  =  800 MHz
+ *	7  = 1000 MHz
+ *	9  = 1200 MHz
+ *	12 = 1500 MHz
+ *	13 = 1600 MHz
+ *	14 = 1800 MHz
+ *	15 = 2000 MHz
+ *	others reserved.
+ *
+ * SAR0[19,10:9] : CPU to L2 Clock divider ratio (6281,6292,6282)
+ *	1 = (1/2) * CPU
+ *	3 = (1/3) * CPU
+ *	5 = (1/4) * CPU
+ *	others reserved.
+ *
+ * SAR0[8:5] : CPU to DDR DRAM Clock divider ratio (6281,6292,6282)
+ *	2 = (1/2) * CPU
+ *	4 = (1/3) * CPU
+ *	6 = (1/4) * CPU
+ *	7 = (2/9) * CPU
+ *	8 = (1/5) * CPU
+ *	9 = (1/6) * CPU
+ *	others reserved.
+ *
+ * SAR0[4:2] : Kirkwood 6180 cpu/l2/ddr clock configuration (6180 only)
+ *	5 = [CPU =  600 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/3) * CPU]
+ *	6 = [CPU =  800 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/4) * CPU]
+ *	7 = [CPU = 1000 MHz, L2 = (1/2) * CPU, DDR = 200 MHz = (1/5) * CPU]
+ *	others reserved.
+ *
+ * SAR0[21] : TCLK frequency
+ *	0 = 200 MHz
+ *	1 = 166 MHz
+ *	others reserved.
+ */
+
+#define SAR_KIRKWOOD_CPU_FREQ(x)	\
+	(((x & (1 <<  1)) >>  1) |	\
+	 ((x & (1 << 22)) >> 21) |	\
+	 ((x & (3 <<  3)) >>  1))
+#define SAR_KIRKWOOD_L2_RATIO(x)	\
+	(((x & (3 <<  9)) >> 9) |	\
+	 (((x & (1 << 19)) >> 17)))
+#define SAR_KIRKWOOD_DDR_RATIO		5
+#define SAR_KIRKWOOD_DDR_RATIO_MASK	0xf
+#define SAR_MV88F6180_CLK		2
+#define SAR_MV88F6180_CLK_MASK		0x7
+#define SAR_KIRKWOOD_TCLK_FREQ		21
+#define SAR_KIRKWOOD_TCLK_FREQ_MASK	0x1
+
+enum { KIRKWOOD_CPU_TO_L2, KIRKWOOD_CPU_TO_DDR };
+
+static const struct coreclk_ratio kirkwood_coreclk_ratios[] __initconst = {
+	{ .id = KIRKWOOD_CPU_TO_L2, .name = "l2clk", },
+	{ .id = KIRKWOOD_CPU_TO_DDR, .name = "ddrclk", }
+};
+
+static u32 __init kirkwood_get_tclk_freq(void __iomem *sar)
+{
+	u32 opt = (readl(sar) >> SAR_KIRKWOOD_TCLK_FREQ) &
+		SAR_KIRKWOOD_TCLK_FREQ_MASK;
+	return (opt) ? 166666667 : 200000000;
+}
+
+static const u32 kirkwood_cpu_freqs[] __initconst = {
+	0, 0, 0, 0,
+	600000000,
+	0,
+	800000000,
+	1000000000,
+	0,
+	1200000000,
+	0, 0,
+	1500000000,
+	1600000000,
+	1800000000,
+	2000000000
+};
+
+static u32 __init kirkwood_get_cpu_freq(void __iomem *sar)
+{
+	u32 opt = SAR_KIRKWOOD_CPU_FREQ(readl(sar));
+	return kirkwood_cpu_freqs[opt];
+}
+
+static const int kirkwood_cpu_l2_ratios[8][2] __initconst = {
+	{ 0, 1 }, { 1, 2 }, { 0, 1 }, { 1, 3 },
+	{ 0, 1 }, { 1, 4 }, { 0, 1 }, { 0, 1 }
+};
+
+static const int kirkwood_cpu_ddr_ratios[16][2] __initconst = {
+	{ 0, 1 }, { 0, 1 }, { 1, 2 }, { 0, 1 },
+	{ 1, 3 }, { 0, 1 }, { 1, 4 }, { 2, 9 },
+	{ 1, 5 }, { 1, 6 }, { 0, 1 }, { 0, 1 },
+	{ 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 }
+};
+
+static void __init kirkwood_get_clk_ratio(
+	void __iomem *sar, int id, int *mult, int *div)
+{
+	switch (id) {
+	case KIRKWOOD_CPU_TO_L2:
+	{
+		u32 opt = SAR_KIRKWOOD_L2_RATIO(readl(sar));
+		*mult = kirkwood_cpu_l2_ratios[opt][0];
+		*div = kirkwood_cpu_l2_ratios[opt][1];
+		break;
+	}
+	case KIRKWOOD_CPU_TO_DDR:
+	{
+		u32 opt = (readl(sar) >> SAR_KIRKWOOD_DDR_RATIO) &
+			SAR_KIRKWOOD_DDR_RATIO_MASK;
+		*mult = kirkwood_cpu_ddr_ratios[opt][0];
+		*div = kirkwood_cpu_ddr_ratios[opt][1];
+		break;
+	}
+	}
+}
+
+static const u32 mv88f6180_cpu_freqs[] __initconst = {
+	0, 0, 0, 0, 0,
+	600000000,
+	800000000,
+	1000000000
+};
+
+static u32 __init mv88f6180_get_cpu_freq(void __iomem *sar)
+{
+	u32 opt = (readl(sar) >> SAR_MV88F6180_CLK) & SAR_MV88F6180_CLK_MASK;
+	return mv88f6180_cpu_freqs[opt];
+}
+
+static const int mv88f6180_cpu_ddr_ratios[8][2] __initconst = {
+	{ 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 },
+	{ 0, 1 }, { 1, 3 }, { 1, 4 }, { 1, 5 }
+};
+
+static void __init mv88f6180_get_clk_ratio(
+	void __iomem *sar, int id, int *mult, int *div)
+{
+	switch (id) {
+	case KIRKWOOD_CPU_TO_L2:
+	{
+		/* mv88f6180 has a fixed 1:2 CPU-to-L2 ratio */
+		*mult = 1;
+		*div = 2;
+		break;
+	}
+	case KIRKWOOD_CPU_TO_DDR:
+	{
+		u32 opt = (readl(sar) >> SAR_MV88F6180_CLK) &
+			SAR_MV88F6180_CLK_MASK;
+		*mult = mv88f6180_cpu_ddr_ratios[opt][0];
+		*div = mv88f6180_cpu_ddr_ratios[opt][1];
+		break;
+	}
+	}
+}
+
+static const struct coreclk_soc_desc kirkwood_coreclks = {
+	.get_tclk_freq = kirkwood_get_tclk_freq,
+	.get_cpu_freq = kirkwood_get_cpu_freq,
+	.get_clk_ratio = kirkwood_get_clk_ratio,
+	.ratios = kirkwood_coreclk_ratios,
+	.num_ratios = ARRAY_SIZE(kirkwood_coreclk_ratios),
+};
+
+static const struct coreclk_soc_desc mv88f6180_coreclks = {
+	.get_tclk_freq = kirkwood_get_tclk_freq,
+	.get_cpu_freq = mv88f6180_get_cpu_freq,
+	.get_clk_ratio = mv88f6180_get_clk_ratio,
+	.ratios = kirkwood_coreclk_ratios,
+	.num_ratios = ARRAY_SIZE(kirkwood_coreclk_ratios),
+};
+
+/*
+ * Clock Gating Control
+ */
+
+static const struct clk_gating_soc_desc kirkwood_gating_desc[] __initconst = {
+	{ "ge0", NULL, 0, 0 },
+	{ "pex0", NULL, 2, 0 },
+	{ "usb0", NULL, 3, 0 },
+	{ "sdio", NULL, 4, 0 },
+	{ "tsu", NULL, 5, 0 },
+	{ "runit", NULL, 7, 0 },
+	{ "xor0", NULL, 8, 0 },
+	{ "audio", NULL, 9, 0 },
+	{ "sata0", NULL, 14, 0 },
+	{ "sata1", NULL, 15, 0 },
+	{ "xor1", NULL, 16, 0 },
+	{ "crypto", NULL, 17, 0 },
+	{ "pex1", NULL, 18, 0 },
+	{ "ge1", NULL, 19, 0 },
+	{ "tdm", NULL, 20, 0 },
+	{ }
+};
+
+
+/*
+ * Clock Muxing Control
+ */
+
+struct clk_muxing_soc_desc {
+	const char *name;
+	const char **parents;
+	int num_parents;
+	int shift;
+	int width;
+	unsigned long flags;
+};
+
+struct clk_muxing_ctrl {
+	spinlock_t *lock;
+	struct clk **muxes;
+	int num_muxes;
+};
+
+static const char *powersave_parents[] = {
+	"cpuclk",
+	"ddrclk",
+};
+
+static const struct clk_muxing_soc_desc kirkwood_mux_desc[] __initconst = {
+	{ "powersave", powersave_parents, ARRAY_SIZE(powersave_parents),
+		11, 1, 0 },
+	{ }
+};
+
+static struct clk *clk_muxing_get_src(
+	struct of_phandle_args *clkspec, void *data)
+{
+	struct clk_muxing_ctrl *ctrl = (struct clk_muxing_ctrl *)data;
+	int n;
+
+	if (clkspec->args_count < 1)
+		return ERR_PTR(-EINVAL);
+
+	for (n = 0; n < ctrl->num_muxes; n++) {
+		struct clk_mux *mux =
+			to_clk_mux(__clk_get_hw(ctrl->muxes[n]));
+		if (clkspec->args[0] == mux->shift)
+			return ctrl->muxes[n];
+	}
+	return ERR_PTR(-ENODEV);
+}
+
+static void __init kirkwood_clk_muxing_setup(struct device_node *np,
+				   const struct clk_muxing_soc_desc *desc)
+{
+	struct clk_muxing_ctrl *ctrl;
+	void __iomem *base;
+	int n;
+
+	base = of_iomap(np, 0);
+	if (WARN_ON(!base))
+		return;
+
+	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+	if (WARN_ON(!ctrl))
+		goto ctrl_out;
+
+	/* lock must already be initialized */
+	ctrl->lock = &ctrl_gating_lock;
+
+	/* Count, allocate, and register clock muxes */
+	for (n = 0; desc[n].name;)
+		n++;
+
+	ctrl->num_muxes = n;
+	ctrl->muxes = kcalloc(ctrl->num_muxes, sizeof(struct clk *),
+			GFP_KERNEL);
+	if (WARN_ON(!ctrl->muxes))
+		goto muxes_out;
+
+	for (n = 0; n < ctrl->num_muxes; n++) {
+		ctrl->muxes[n] = clk_register_mux(NULL, desc[n].name,
+				desc[n].parents, desc[n].num_parents,
+				desc[n].flags, base, desc[n].shift,
+				desc[n].width, desc[n].flags, ctrl->lock);
+		WARN_ON(IS_ERR(ctrl->muxes[n]));
+	}
+
+	of_clk_add_provider(np, clk_muxing_get_src, ctrl);
+
+	return;
+muxes_out:
+	kfree(ctrl);
+ctrl_out:
+	iounmap(base);
+}
+
+static void __init kirkwood_clk_init(struct device_node *np)
+{
+	struct device_node *cgnp =
+		of_find_compatible_node(NULL, NULL, "marvell,kirkwood-gating-clock");
+
+
+	if (of_device_is_compatible(np, "marvell,mv88f6180-core-clock"))
+		mvebu_coreclk_setup(np, &mv88f6180_coreclks);
+	else
+		mvebu_coreclk_setup(np, &kirkwood_coreclks);
+
+	if (cgnp) {
+		mvebu_clk_gating_setup(cgnp, kirkwood_gating_desc);
+		kirkwood_clk_muxing_setup(cgnp, kirkwood_mux_desc);
+
+		of_node_put(cgnp);
+	}
+}
+CLK_OF_DECLARE(kirkwood_clk, "marvell,kirkwood-core-clock",
+	       kirkwood_clk_init);
+CLK_OF_DECLARE(mv88f6180_clk, "marvell,mv88f6180-core-clock",
+	       kirkwood_clk_init);