arch: bcm281xx: Initial commit of bcm281xx architecture code

Add bcm281xx architecture support code including a clock framework and
chip reset.  Define register block base addresses for the bcm281xx
architecture and create an empty gpio header file required when
CONFIG_CMD_GPIO is set.

Signed-off-by: Darwin Rambo <drambo@broadcom.com>
Reviewed-by: Steve Rae <srae@broadcom.com>
Reviewed-by: Tim Kryger <tkryger@linaro.org>

10 files changed, 1792 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/bcm281xx/Makefile b/arch/arm/cpu/armv7/bcm281xx/Makefile
new file mode 100644
index 0000000..98f5aa5
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/Makefile
@@ -0,0 +1,11 @@
+#
+# Copyright 2013 Broadcom Corporation.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= reset.o
+obj-y	+= clk-core.o
+obj-y	+= clk-bcm281xx.o
+obj-y	+= clk-sdio.o
+obj-y	+= clk-bsc.o
diff --git a/arch/arm/cpu/armv7/bcm281xx/clk-bcm281xx.c b/arch/arm/cpu/armv7/bcm281xx/clk-bcm281xx.c
new file mode 100644
index 0000000..bc8a170
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/clk-bcm281xx.c
@@ -0,0 +1,523 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+/*
+ *
+ * bcm281xx-specific clock tables
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/sysmap.h>
+#include <asm/kona-common/clk.h>
+#include "clk-core.h"
+
+#define CLOCK_1K		1000
+#define CLOCK_1M		(CLOCK_1K * 1000)
+
+/* declare a reference clock */
+#define DECLARE_REF_CLK(clk_name, clk_parent, clk_rate, clk_div) \
+static struct refclk clk_name = { \
+	.clk    =       { \
+		.name   =       #clk_name, \
+		.parent =       clk_parent, \
+		.rate   =       clk_rate, \
+		.div    =       clk_div, \
+		.ops    =       &ref_clk_ops, \
+	}, \
+}
+
+/*
+ * Reference clocks
+ */
+
+/* Declare a list of reference clocks */
+DECLARE_REF_CLK(ref_crystal,	0,		26  * CLOCK_1M,	1);
+DECLARE_REF_CLK(var_96m,	0,		96  * CLOCK_1M,	1);
+DECLARE_REF_CLK(ref_96m,	0,		96  * CLOCK_1M,	1);
+DECLARE_REF_CLK(ref_312m,	0,		312 * CLOCK_1M,	0);
+DECLARE_REF_CLK(ref_104m,	&ref_312m.clk,	104 * CLOCK_1M,	3);
+DECLARE_REF_CLK(ref_52m,	&ref_104m.clk,	52  * CLOCK_1M,	2);
+DECLARE_REF_CLK(ref_13m,	&ref_52m.clk,	13  * CLOCK_1M,	4);
+DECLARE_REF_CLK(var_312m,	0,		312 * CLOCK_1M,	0);
+DECLARE_REF_CLK(var_104m,	&var_312m.clk,	104 * CLOCK_1M,	3);
+DECLARE_REF_CLK(var_52m,	&var_104m.clk,	52  * CLOCK_1M,	2);
+DECLARE_REF_CLK(var_13m,	&var_52m.clk,	13  * CLOCK_1M,	4);
+
+struct refclk_lkup {
+	struct refclk *procclk;
+	const char *name;
+};
+
+/* Lookup table for string to clk tranlation */
+#define MKSTR(x) {&x, #x}
+static struct refclk_lkup refclk_str_tbl[] = {
+	MKSTR(ref_crystal), MKSTR(var_96m), MKSTR(ref_96m),
+	MKSTR(ref_312m), MKSTR(ref_104m), MKSTR(ref_52m),
+	MKSTR(ref_13m), MKSTR(var_312m), MKSTR(var_104m),
+	MKSTR(var_52m), MKSTR(var_13m),
+};
+
+int refclk_entries = sizeof(refclk_str_tbl)/sizeof(refclk_str_tbl[0]);
+
+/* convert ref clock string to clock structure pointer */
+struct refclk *refclk_str_to_clk(const char *name)
+{
+	int i;
+	struct refclk_lkup *tblp = refclk_str_tbl;
+	for (i = 0; i < refclk_entries; i++, tblp++) {
+		if (!(strcmp(name, tblp->name)))
+			return tblp->procclk;
+	}
+	return NULL;
+}
+
+/* frequency tables indexed by freq_id */
+unsigned long master_axi_freq_tbl[8] = {
+	26 * CLOCK_1M,
+	52 * CLOCK_1M,
+	104 * CLOCK_1M,
+	156 * CLOCK_1M,
+	156 * CLOCK_1M,
+	208 * CLOCK_1M,
+	312 * CLOCK_1M,
+	312 * CLOCK_1M
+};
+
+unsigned long master_ahb_freq_tbl[8] = {
+	26 * CLOCK_1M,
+	52 * CLOCK_1M,
+	52 * CLOCK_1M,
+	52 * CLOCK_1M,
+	78 * CLOCK_1M,
+	104 * CLOCK_1M,
+	104 * CLOCK_1M,
+	156 * CLOCK_1M
+};
+
+unsigned long slave_axi_freq_tbl[8] = {
+	26 * CLOCK_1M,
+	52 * CLOCK_1M,
+	78 * CLOCK_1M,
+	104 * CLOCK_1M,
+	156 * CLOCK_1M,
+	156 * CLOCK_1M
+};
+
+unsigned long slave_apb_freq_tbl[8] = {
+	26 * CLOCK_1M,
+	26 * CLOCK_1M,
+	39 * CLOCK_1M,
+	52 * CLOCK_1M,
+	52 * CLOCK_1M,
+	78 * CLOCK_1M
+};
+
+static struct bus_clk_data bsc1_apb_data = {
+	.gate = HW_SW_GATE_AUTO(0x0458, 16, 0, 1),
+};
+
+static struct bus_clk_data bsc2_apb_data = {
+	.gate = HW_SW_GATE_AUTO(0x045c, 16, 0, 1),
+};
+
+static struct bus_clk_data bsc3_apb_data = {
+	.gate = HW_SW_GATE_AUTO(0x0484, 16, 0, 1),
+};
+
+/* * Master CCU clocks */
+static struct peri_clk_data sdio1_data = {
+	.gate		= HW_SW_GATE(0x0358, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_52m",
+				 "ref_52m",
+				 "var_96m",
+				 "ref_96m"),
+	.sel		= SELECTOR(0x0a28, 0, 3),
+	.div		= DIVIDER(0x0a28, 4, 14),
+	.trig		= TRIGGER(0x0afc, 9),
+};
+
+static struct peri_clk_data sdio2_data = {
+	.gate		= HW_SW_GATE(0x035c, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_52m",
+				 "ref_52m",
+				 "var_96m",
+				 "ref_96m"),
+	.sel		= SELECTOR(0x0a2c, 0, 3),
+	.div		= DIVIDER(0x0a2c, 4, 14),
+	.trig		= TRIGGER(0x0afc, 10),
+};
+
+static struct peri_clk_data sdio3_data = {
+	.gate		= HW_SW_GATE(0x0364, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_52m",
+				 "ref_52m",
+				 "var_96m",
+				 "ref_96m"),
+	.sel		= SELECTOR(0x0a34, 0, 3),
+	.div		= DIVIDER(0x0a34, 4, 14),
+	.trig		= TRIGGER(0x0afc, 12),
+};
+
+static struct peri_clk_data sdio4_data = {
+	.gate		= HW_SW_GATE(0x0360, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_52m",
+				 "ref_52m",
+				 "var_96m",
+				 "ref_96m"),
+	.sel		= SELECTOR(0x0a30, 0, 3),
+	.div		= DIVIDER(0x0a30, 4, 14),
+	.trig		= TRIGGER(0x0afc, 11),
+};
+
+static struct peri_clk_data sdio1_sleep_data = {
+	.clocks		= CLOCKS("ref_32k"),
+	.gate		= SW_ONLY_GATE(0x0358, 20, 4),
+};
+
+static struct peri_clk_data sdio2_sleep_data = {
+	.clocks		= CLOCKS("ref_32k"),
+	.gate		= SW_ONLY_GATE(0x035c, 20, 4),
+};
+
+static struct peri_clk_data sdio3_sleep_data = {
+	.clocks		= CLOCKS("ref_32k"),
+	.gate		= SW_ONLY_GATE(0x0364, 20, 4),
+};
+
+static struct peri_clk_data sdio4_sleep_data = {
+	.clocks		= CLOCKS("ref_32k"),
+	.gate		= SW_ONLY_GATE(0x0360, 20, 4),
+};
+
+static struct bus_clk_data sdio1_ahb_data = {
+	.gate		= HW_SW_GATE_AUTO(0x0358, 16, 0, 1),
+};
+
+static struct bus_clk_data sdio2_ahb_data = {
+	.gate		= HW_SW_GATE_AUTO(0x035c, 16, 0, 1),
+};
+
+static struct bus_clk_data sdio3_ahb_data = {
+	.gate		= HW_SW_GATE_AUTO(0x0364, 16, 0, 1),
+};
+
+static struct bus_clk_data sdio4_ahb_data = {
+	.gate		= HW_SW_GATE_AUTO(0x0360, 16, 0, 1),
+};
+
+/* * Slave CCU clocks */
+static struct peri_clk_data bsc1_data = {
+	.gate		= HW_SW_GATE(0x0458, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_104m",
+				 "ref_104m",
+				 "var_13m",
+				 "ref_13m"),
+	.sel		= SELECTOR(0x0a64, 0, 3),
+	.trig		= TRIGGER(0x0afc, 23),
+};
+
+static struct peri_clk_data bsc2_data = {
+	.gate		= HW_SW_GATE(0x045c, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_104m",
+				 "ref_104m",
+				 "var_13m",
+				 "ref_13m"),
+	.sel		= SELECTOR(0x0a68, 0, 3),
+	.trig		= TRIGGER(0x0afc, 24),
+};
+
+static struct peri_clk_data bsc3_data = {
+	.gate		= HW_SW_GATE(0x0484, 18, 2, 3),
+	.clocks		= CLOCKS("ref_crystal",
+				 "var_104m",
+				 "ref_104m",
+				 "var_13m",
+				 "ref_13m"),
+	.sel		= SELECTOR(0x0a84, 0, 3),
+	.trig		= TRIGGER(0x0b00, 2),
+};
+
+/*
+ * CCU clocks
+ */
+
+static struct ccu_clock kpm_ccu_clk = {
+	.clk = {
+		.name = "kpm_ccu_clk",
+		.ops = &ccu_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.num_policy_masks = 1,
+	.policy_freq_offset = 0x00000008,
+	.freq_bit_shift = 8,
+	.policy_ctl_offset = 0x0000000c,
+	.policy0_mask_offset = 0x00000010,
+	.policy1_mask_offset = 0x00000014,
+	.policy2_mask_offset = 0x00000018,
+	.policy3_mask_offset = 0x0000001c,
+	.lvm_en_offset = 0x00000034,
+	.freq_id = 2,
+	.freq_tbl = master_axi_freq_tbl,
+};
+
+static struct ccu_clock kps_ccu_clk = {
+	.clk = {
+		.name = "kps_ccu_clk",
+		.ops = &ccu_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+	},
+	.num_policy_masks = 2,
+	.policy_freq_offset = 0x00000008,
+	.freq_bit_shift = 8,
+	.policy_ctl_offset = 0x0000000c,
+	.policy0_mask_offset = 0x00000010,
+	.policy1_mask_offset = 0x00000014,
+	.policy2_mask_offset = 0x00000018,
+	.policy3_mask_offset = 0x0000001c,
+	.policy0_mask2_offset = 0x00000048,
+	.policy1_mask2_offset = 0x0000004c,
+	.policy2_mask2_offset = 0x00000050,
+	.policy3_mask2_offset = 0x00000054,
+	.lvm_en_offset = 0x00000034,
+	.freq_id = 2,
+	.freq_tbl = slave_axi_freq_tbl,
+};
+
+/*
+ * Bus clocks
+ */
+
+/* KPM bus clocks */
+static struct bus_clock sdio1_ahb_clk = {
+	.clk = {
+		.name = "sdio1_ahb_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.freq_tbl = master_ahb_freq_tbl,
+	.data = &sdio1_ahb_data,
+};
+
+static struct bus_clock sdio2_ahb_clk = {
+	.clk = {
+		.name = "sdio2_ahb_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.freq_tbl = master_ahb_freq_tbl,
+	.data = &sdio2_ahb_data,
+};
+
+static struct bus_clock sdio3_ahb_clk = {
+	.clk = {
+		.name = "sdio3_ahb_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.freq_tbl = master_ahb_freq_tbl,
+	.data = &sdio3_ahb_data,
+};
+
+static struct bus_clock sdio4_ahb_clk = {
+	.clk = {
+		.name = "sdio4_ahb_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.freq_tbl = master_ahb_freq_tbl,
+	.data = &sdio4_ahb_data,
+};
+
+static struct bus_clock bsc1_apb_clk = {
+	.clk = {
+		.name = "bsc1_apb_clk",
+		.parent = &kps_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+	},
+	.freq_tbl = slave_apb_freq_tbl,
+	.data = &bsc1_apb_data,
+};
+
+static struct bus_clock bsc2_apb_clk = {
+	.clk = {
+		.name = "bsc2_apb_clk",
+		.parent = &kps_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+		},
+	.freq_tbl = slave_apb_freq_tbl,
+	.data = &bsc2_apb_data,
+};
+
+static struct bus_clock bsc3_apb_clk = {
+	.clk = {
+		.name = "bsc3_apb_clk",
+		.parent = &kps_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+		},
+	.freq_tbl = slave_apb_freq_tbl,
+	.data = &bsc3_apb_data,
+};
+
+/* KPM peripheral */
+static struct peri_clock sdio1_clk = {
+	.clk = {
+		.name = "sdio1_clk",
+		.parent = &ref_52m.clk,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio1_data,
+};
+
+static struct peri_clock sdio2_clk = {
+	.clk = {
+		.name = "sdio2_clk",
+		.parent = &ref_52m.clk,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio2_data,
+};
+
+static struct peri_clock sdio3_clk = {
+	.clk = {
+		.name = "sdio3_clk",
+		.parent = &ref_52m.clk,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio3_data,
+};
+
+static struct peri_clock sdio4_clk = {
+	.clk = {
+		.name = "sdio4_clk",
+		.parent = &ref_52m.clk,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio4_data,
+};
+
+static struct peri_clock sdio1_sleep_clk = {
+	.clk = {
+		.name = "sdio1_sleep_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio1_sleep_data,
+};
+
+static struct peri_clock sdio2_sleep_clk = {
+	.clk = {
+		.name = "sdio2_sleep_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio2_sleep_data,
+};
+
+static struct peri_clock sdio3_sleep_clk = {
+	.clk = {
+		.name = "sdio3_sleep_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio3_sleep_data,
+};
+
+static struct peri_clock sdio4_sleep_clk = {
+	.clk = {
+		.name = "sdio4_sleep_clk",
+		.parent = &kpm_ccu_clk.clk,
+		.ops = &bus_clk_ops,
+		.ccu_clk_mgr_base = KONA_MST_CLK_BASE_ADDR,
+	},
+	.data = &sdio4_sleep_data,
+};
+
+/* KPS peripheral clock */
+static struct peri_clock bsc1_clk = {
+	.clk = {
+		.name = "bsc1_clk",
+		.parent = &ref_13m.clk,
+		.rate = 13 * CLOCK_1M,
+		.div = 1,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+	},
+	.data = &bsc1_data,
+};
+
+static struct peri_clock bsc2_clk = {
+	.clk = {
+		.name = "bsc2_clk",
+		.parent = &ref_13m.clk,
+		.rate = 13 * CLOCK_1M,
+		.div = 1,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+	},
+	.data = &bsc2_data,
+};
+
+static struct peri_clock bsc3_clk = {
+	.clk = {
+		.name = "bsc3_clk",
+		.parent = &ref_13m.clk,
+		.rate = 13 * CLOCK_1M,
+		.div = 1,
+		.ops = &peri_clk_ops,
+		.ccu_clk_mgr_base = KONA_SLV_CLK_BASE_ADDR,
+	},
+	.data = &bsc3_data,
+};
+
+/* public table for registering clocks */
+struct clk_lookup arch_clk_tbl[] = {
+	/* Peripheral clocks */
+	CLK_LK(sdio1),
+	CLK_LK(sdio2),
+	CLK_LK(sdio3),
+	CLK_LK(sdio4),
+	CLK_LK(sdio1_sleep),
+	CLK_LK(sdio2_sleep),
+	CLK_LK(sdio3_sleep),
+	CLK_LK(sdio4_sleep),
+	CLK_LK(bsc1),
+	CLK_LK(bsc2),
+	CLK_LK(bsc3),
+	/* Bus clocks */
+	CLK_LK(sdio1_ahb),
+	CLK_LK(sdio2_ahb),
+	CLK_LK(sdio3_ahb),
+	CLK_LK(sdio4_ahb),
+	CLK_LK(bsc1_apb),
+	CLK_LK(bsc2_apb),
+	CLK_LK(bsc3_apb),
+};
+
+/* public array size */
+unsigned int arch_clk_tbl_array_size = ARRAY_SIZE(arch_clk_tbl);
diff --git a/arch/arm/cpu/armv7/bcm281xx/clk-bsc.c b/arch/arm/cpu/armv7/bcm281xx/clk-bsc.c
new file mode 100644
index 0000000..ba55d0a
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/clk-bsc.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/sysmap.h>
+#include <asm/kona-common/clk.h>
+#include "clk-core.h"
+
+/* Enable appropriate clocks for a BSC/I2C port */
+int clk_bsc_enable(void *base)
+{
+	int ret;
+	char *bscstr, *apbstr;
+
+	switch ((u32) base) {
+	case PMU_BSC_BASE_ADDR:
+		/* PMU clock is always enabled */
+		return 0;
+	case BSC1_BASE_ADDR:
+		bscstr = "bsc1_clk";
+		apbstr = "bsc1_apb_clk";
+		break;
+	case BSC2_BASE_ADDR:
+		bscstr = "bsc2_clk";
+		apbstr = "bsc2_apb_clk";
+		break;
+	case BSC3_BASE_ADDR:
+		bscstr = "bsc3_clk";
+		apbstr = "bsc3_apb_clk";
+		break;
+	default:
+		printf("%s: base 0x%p not found\n", __func__, base);
+		return -EINVAL;
+	}
+
+	/* Note that the bus clock must be enabled first */
+
+	ret = clk_get_and_enable(apbstr);
+	if (ret)
+		return ret;
+
+	ret = clk_get_and_enable(bscstr);
+	if (ret)
+		return ret;
+
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/bcm281xx/clk-core.c b/arch/arm/cpu/armv7/bcm281xx/clk-core.c
new file mode 100644
index 0000000..d442583
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/clk-core.c
@@ -0,0 +1,513 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+/*
+ *
+ * bcm281xx architecture clock framework
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <bitfield.h>
+#include <asm/arch/sysmap.h>
+#include <asm/kona-common/clk.h>
+#include "clk-core.h"
+
+#define CLK_WR_ACCESS_PASSWORD	0x00a5a501
+#define WR_ACCESS_OFFSET	0	/* common to all clock blocks */
+#define POLICY_CTL_GO		1	/* Load and refresh policy masks */
+#define POLICY_CTL_GO_ATL	4	/* Active Load */
+
+/* Helper function */
+int clk_get_and_enable(char *clkstr)
+{
+	int ret = 0;
+	struct clk *c;
+
+	debug("%s: %s\n", __func__, clkstr);
+
+	c = clk_get(clkstr);
+	if (c) {
+		ret = clk_enable(c);
+		if (ret)
+			return ret;
+	} else {
+		printf("%s: Couldn't find %s\n", __func__, clkstr);
+		return -EINVAL;
+	}
+	return ret;
+}
+
+/*
+ * Poll a register in a CCU's address space, returning when the
+ * specified bit in that register's value is set (or clear).  Delay
+ * a microsecond after each read of the register.  Returns true if
+ * successful, or false if we gave up trying.
+ *
+ * Caller must ensure the CCU lock is held.
+ */
+#define CLK_GATE_DELAY_USEC 2000
+static inline int wait_bit(void *base, u32 offset, u32 bit, bool want)
+{
+	unsigned int tries;
+	u32 bit_mask = 1 << bit;
+
+	for (tries = 0; tries < CLK_GATE_DELAY_USEC; tries++) {
+		u32 val;
+		bool bit_val;
+
+		val = readl(base + offset);
+		bit_val = (val & bit_mask) ? 1 : 0;
+		if (bit_val == want)
+			return 0;	/* success */
+		udelay(1);
+	}
+
+	debug("%s: timeout on addr 0x%p, waiting for bit %d to go to %d\n",
+	      __func__, base + offset, bit, want);
+
+	return -ETIMEDOUT;
+}
+
+/* Enable a peripheral clock */
+static int peri_clk_enable(struct clk *c, int enable)
+{
+	int ret = 0;
+	u32 reg;
+	struct peri_clock *peri_clk = to_peri_clk(c);
+	struct peri_clk_data *cd = peri_clk->data;
+	struct bcm_clk_gate *gate = &cd->gate;
+	void *base = (void *)c->ccu_clk_mgr_base;
+
+
+	debug("%s: %s\n", __func__, c->name);
+
+	clk_get_rate(c);	/* Make sure rate and sel are filled in */
+
+	/* enable access */
+	writel(CLK_WR_ACCESS_PASSWORD, base + WR_ACCESS_OFFSET);
+
+	if (enable) {
+		debug("%s %s set rate %lu div %lu sel %d parent %lu\n",
+		      __func__, c->name, c->rate, c->div, c->sel,
+		      c->parent->rate);
+
+		/*
+		 * clkgate - only software controllable gates are
+		 * supported by u-boot which includes all clocks
+		 * that matter. This avoids bringing in a lot of extra
+		 * complexity as done in the kernel framework.
+		 */
+		if (gate_exists(gate)) {
+			reg = readl(base + cd->gate.offset);
+			reg |= (1 << cd->gate.en_bit);
+			writel(reg, base + cd->gate.offset);
+		}
+
+		/* div and pll select */
+		if (divider_exists(&cd->div)) {
+			reg = readl(base + cd->div.offset);
+			bitfield_replace(reg, cd->div.shift, cd->div.width,
+					 c->div - 1);
+			writel(reg, base + cd->div.offset);
+		}
+
+		/* frequency selector */
+		if (selector_exists(&cd->sel)) {
+			reg = readl(base + cd->sel.offset);
+			bitfield_replace(reg, cd->sel.shift, cd->sel.width,
+					 c->sel);
+			writel(reg, base + cd->sel.offset);
+		}
+
+		/* trigger */
+		if (trigger_exists(&cd->trig)) {
+			writel((1 << cd->trig.bit), base + cd->trig.offset);
+
+			/* wait for trigger status bit to go to 0 */
+			ret = wait_bit(base, cd->trig.offset, cd->trig.bit, 0);
+			if (ret)
+				return ret;
+		}
+
+		/* wait for running (status_bit = 1) */
+		ret = wait_bit(base, cd->gate.offset, cd->gate.status_bit, 1);
+		if (ret)
+			return ret;
+	} else {
+		debug("%s disable clock %s\n", __func__, c->name);
+
+		/* clkgate */
+		reg = readl(base + cd->gate.offset);
+		reg &= ~(1 << cd->gate.en_bit);
+		writel(reg, base + cd->gate.offset);
+
+		/* wait for stop (status_bit = 0) */
+		ret = wait_bit(base, cd->gate.offset, cd->gate.status_bit, 0);
+	}
+
+	/* disable access */
+	writel(0, base + WR_ACCESS_OFFSET);
+
+	return ret;
+}
+
+/* Set the rate of a peripheral clock */
+static int peri_clk_set_rate(struct clk *c, unsigned long rate)
+{
+	int ret = 0;
+	int i;
+	unsigned long diff;
+	unsigned long new_rate = 0, div = 1;
+	struct peri_clock *peri_clk = to_peri_clk(c);
+	struct peri_clk_data *cd = peri_clk->data;
+	const char **clock;
+
+	debug("%s: %s\n", __func__, c->name);
+	diff = rate;
+
+	i = 0;
+	for (clock = cd->clocks; *clock; clock++, i++) {
+		struct refclk *ref = refclk_str_to_clk(*clock);
+		if (!ref) {
+			printf("%s: Lookup of %s failed\n", __func__, *clock);
+			return -EINVAL;
+		}
+
+		/* round to the new rate */
+		div = ref->clk.rate / rate;
+		if (div == 0)
+			div = 1;
+
+		new_rate = ref->clk.rate / div;
+
+		/* get the min diff */
+		if (abs(new_rate - rate) < diff) {
+			diff = abs(new_rate - rate);
+			c->sel = i;
+			c->parent = &ref->clk;
+			c->rate = new_rate;
+			c->div = div;
+		}
+	}
+
+	debug("%s %s set rate %lu div %lu sel %d parent %lu\n", __func__,
+	      c->name, c->rate, c->div, c->sel, c->parent->rate);
+	return ret;
+}
+
+/* Get the rate of a peripheral clock */
+static unsigned long peri_clk_get_rate(struct clk *c)
+{
+	struct peri_clock *peri_clk = to_peri_clk(c);
+	struct peri_clk_data *cd = peri_clk->data;
+	void *base = (void *)c->ccu_clk_mgr_base;
+	int div = 1;
+	const char **clock;
+	struct refclk *ref;
+	u32 reg;
+
+	debug("%s: %s\n", __func__, c->name);
+	if (selector_exists(&cd->sel)) {
+		reg = readl(base + cd->sel.offset);
+		c->sel = bitfield_extract(reg, cd->sel.shift, cd->sel.width);
+	} else {
+		/*
+		 * For peri clocks that don't have a selector, the single
+		 * reference clock will always exist at index 0.
+		 */
+		c->sel = 0;
+	}
+
+	if (divider_exists(&cd->div)) {
+		reg = readl(base + cd->div.offset);
+		div = bitfield_extract(reg, cd->div.shift, cd->div.width);
+		div += 1;
+	}
+
+	clock = cd->clocks;
+	ref = refclk_str_to_clk(clock[c->sel]);
+	if (!ref) {
+		printf("%s: Can't lookup %s\n", __func__, clock[c->sel]);
+		return 0;
+	}
+
+	c->parent = &ref->clk;
+	c->div = div;
+	c->rate = c->parent->rate / c->div;
+	debug("%s parent rate %lu div %d sel %d rate %lu\n", __func__,
+	      c->parent->rate, div, c->sel, c->rate);
+
+	return c->rate;
+}
+
+/* Peripheral clock operations */
+struct clk_ops peri_clk_ops = {
+	.enable = peri_clk_enable,
+	.set_rate = peri_clk_set_rate,
+	.get_rate = peri_clk_get_rate,
+};
+
+/* Enable a CCU clock */
+static int ccu_clk_enable(struct clk *c, int enable)
+{
+	struct ccu_clock *ccu_clk = to_ccu_clk(c);
+	void *base = (void *)c->ccu_clk_mgr_base;
+	int ret = 0;
+	u32 reg;
+
+	debug("%s: %s\n", __func__, c->name);
+	if (!enable)
+		return -EINVAL;	/* CCU clock cannot shutdown */
+
+	/* enable access */
+	writel(CLK_WR_ACCESS_PASSWORD, base + WR_ACCESS_OFFSET);
+
+	/* config enable for policy engine */
+	writel(1, base + ccu_clk->lvm_en_offset);
+
+	/* wait for bit to go to 0 */
+	ret = wait_bit(base, ccu_clk->lvm_en_offset, 0, 0);
+	if (ret)
+		return ret;
+
+	/* freq ID */
+	if (!ccu_clk->freq_bit_shift)
+		ccu_clk->freq_bit_shift = 8;
+
+	/* Set frequency id for each of the 4 policies */
+	reg = ccu_clk->freq_id |
+	    (ccu_clk->freq_id << (ccu_clk->freq_bit_shift)) |
+	    (ccu_clk->freq_id << (ccu_clk->freq_bit_shift * 2)) |
+	    (ccu_clk->freq_id << (ccu_clk->freq_bit_shift * 3));
+	writel(reg, base + ccu_clk->policy_freq_offset);
+
+	/* enable all clock mask */
+	writel(0x7fffffff, base + ccu_clk->policy0_mask_offset);
+	writel(0x7fffffff, base + ccu_clk->policy1_mask_offset);
+	writel(0x7fffffff, base + ccu_clk->policy2_mask_offset);
+	writel(0x7fffffff, base + ccu_clk->policy3_mask_offset);
+
+	if (ccu_clk->num_policy_masks == 2) {
+		writel(0x7fffffff, base + ccu_clk->policy0_mask2_offset);
+		writel(0x7fffffff, base + ccu_clk->policy1_mask2_offset);
+		writel(0x7fffffff, base + ccu_clk->policy2_mask2_offset);
+		writel(0x7fffffff, base + ccu_clk->policy3_mask2_offset);
+	}
+
+	/* start policy engine */
+	reg = readl(base + ccu_clk->policy_ctl_offset);
+	reg |= (POLICY_CTL_GO + POLICY_CTL_GO_ATL);
+	writel(reg, base + ccu_clk->policy_ctl_offset);
+
+	/* wait till started */
+	ret = wait_bit(base, ccu_clk->policy_ctl_offset, 0, 0);
+	if (ret)
+		return ret;
+
+	/* disable access */
+	writel(0, base + WR_ACCESS_OFFSET);
+
+	return ret;
+}
+
+/* Get the CCU clock rate */
+static unsigned long ccu_clk_get_rate(struct clk *c)
+{
+	struct ccu_clock *ccu_clk = to_ccu_clk(c);
+	debug("%s: %s\n", __func__, c->name);
+	c->rate = ccu_clk->freq_tbl[ccu_clk->freq_id];
+	return c->rate;
+}
+
+/* CCU clock operations */
+struct clk_ops ccu_clk_ops = {
+	.enable = ccu_clk_enable,
+	.get_rate = ccu_clk_get_rate,
+};
+
+/* Enable a bus clock */
+static int bus_clk_enable(struct clk *c, int enable)
+{
+	struct bus_clock *bus_clk = to_bus_clk(c);
+	struct bus_clk_data *cd = bus_clk->data;
+	void *base = (void *)c->ccu_clk_mgr_base;
+	int ret = 0;
+	u32 reg;
+
+	debug("%s: %s\n", __func__, c->name);
+	/* enable access */
+	writel(CLK_WR_ACCESS_PASSWORD, base + WR_ACCESS_OFFSET);
+
+	/* enable gating */
+	reg = readl(base + cd->gate.offset);
+	if (!!(reg & (1 << cd->gate.status_bit)) == !!enable)
+		debug("%s already %s\n", c->name,
+		      enable ? "enabled" : "disabled");
+	else {
+		int want = (enable) ? 1 : 0;
+		reg |= (1 << cd->gate.hw_sw_sel_bit);
+
+		if (enable)
+			reg |= (1 << cd->gate.en_bit);
+		else
+			reg &= ~(1 << cd->gate.en_bit);
+
+		writel(reg, base + cd->gate.offset);
+		ret = wait_bit(base, cd->gate.offset, cd->gate.status_bit,
+			       want);
+		if (ret)
+			return ret;
+	}
+
+	/* disable access */
+	writel(0, base + WR_ACCESS_OFFSET);
+
+	return ret;
+}
+
+/* Get the rate of a bus clock */
+static unsigned long bus_clk_get_rate(struct clk *c)
+{
+	struct bus_clock *bus_clk = to_bus_clk(c);
+	struct ccu_clock *ccu_clk;
+
+	debug("%s: %s\n", __func__, c->name);
+	ccu_clk = to_ccu_clk(c->parent);
+
+	c->rate = bus_clk->freq_tbl[ccu_clk->freq_id];
+	c->div = ccu_clk->freq_tbl[ccu_clk->freq_id] / c->rate;
+	return c->rate;
+}
+
+/* Bus clock operations */
+struct clk_ops bus_clk_ops = {
+	.enable = bus_clk_enable,
+	.get_rate = bus_clk_get_rate,
+};
+
+/* Enable a reference clock */
+static int ref_clk_enable(struct clk *c, int enable)
+{
+	debug("%s: %s\n", __func__, c->name);
+	return 0;
+}
+
+/* Reference clock operations */
+struct clk_ops ref_clk_ops = {
+	.enable = ref_clk_enable,
+};
+
+/*
+ * clk.h implementation follows
+ */
+
+/* Initialize the clock framework */
+int clk_init(void)
+{
+	debug("%s:\n", __func__);
+	return 0;
+}
+
+/* Get a clock handle, give a name string */
+struct clk *clk_get(const char *con_id)
+{
+	int i;
+	struct clk_lookup *clk_tblp;
+
+	debug("%s: %s\n", __func__, con_id);
+
+	clk_tblp = arch_clk_tbl;
+	for (i = 0; i < arch_clk_tbl_array_size; i++, clk_tblp++) {
+		if (clk_tblp->con_id) {
+			if (!con_id || strcmp(clk_tblp->con_id, con_id))
+				continue;
+			return clk_tblp->clk;
+		}
+	}
+	return NULL;
+}
+
+/* Enable a clock */
+int clk_enable(struct clk *c)
+{
+	int ret = 0;
+
+	debug("%s: %s\n", __func__, c->name);
+	if (!c->ops || !c->ops->enable)
+		return -1;
+
+	/* enable parent clock first */
+	if (c->parent)
+		ret = clk_enable(c->parent);
+
+	if (ret)
+		return ret;
+
+	if (!c->use_cnt) {
+		c->use_cnt++;
+		ret = c->ops->enable(c, 1);
+	}
+
+	return ret;
+}
+
+/* Disable a clock */
+void clk_disable(struct clk *c)
+{
+	debug("%s: %s\n", __func__, c->name);
+	if (!c->ops || !c->ops->enable)
+		return;
+
+	if (c->use_cnt) {
+		c->use_cnt--;
+		c->ops->enable(c, 0);
+	}
+
+	/* disable parent */
+	if (c->parent)
+		clk_disable(c->parent);
+}
+
+/* Get the clock rate */
+unsigned long clk_get_rate(struct clk *c)
+{
+	unsigned long rate;
+
+	debug("%s: %s\n", __func__, c->name);
+	if (!c || !c->ops || !c->ops->get_rate)
+		return 0;
+
+	rate = c->ops->get_rate(c);
+	debug("%s: rate = %ld\n", __func__, rate);
+	return rate;
+}
+
+/* Set the clock rate */
+int clk_set_rate(struct clk *c, unsigned long rate)
+{
+	int ret;
+
+	debug("%s: %s rate=%ld\n", __func__, c->name, rate);
+	if (!c || !c->ops || !c->ops->set_rate)
+		return -EINVAL;
+
+	if (c->use_cnt)
+		return -EINVAL;
+
+	ret = c->ops->set_rate(c, rate);
+
+	return ret;
+}
+
+/* Not required for this arch */
+/*
+long clk_round_rate(struct clk *clk, unsigned long rate);
+int clk_set_parent(struct clk *clk, struct clk *parent);
+struct clk *clk_get_parent(struct clk *clk);
+*/
diff --git a/arch/arm/cpu/armv7/bcm281xx/clk-core.h b/arch/arm/cpu/armv7/bcm281xx/clk-core.h
new file mode 100644
index 0000000..882a297
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/clk-core.h
@@ -0,0 +1,495 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <linux/stddef.h>
+
+#ifdef CONFIG_CLK_DEBUG
+#undef writel
+#undef readl
+static inline void writel(u32 val, void *addr)
+{
+	printf("Write [0x%p] = 0x%08x\n", addr, val);
+	*(u32 *)addr = val;
+}
+
+static inline u32 readl(void *addr)
+{
+	u32 val = *(u32 *)addr;
+	printf("Read  [0x%p] = 0x%08x\n", addr, val);
+	return val;
+}
+#endif
+
+struct clk;
+
+struct clk_lookup {
+	const char *dev_id;
+	const char *con_id;
+	struct clk *clk;
+};
+
+extern struct clk_lookup arch_clk_tbl[];
+extern unsigned int arch_clk_tbl_array_size;
+
+/**
+ * struct clk_ops - standard clock operations
+ * @enable: enable/disable clock, see clk_enable() and clk_disable()
+ * @set_rate: set the clock rate, see clk_set_rate().
+ * @get_rate: get the clock rate, see clk_get_rate().
+ * @round_rate: round a given clock rate, see clk_round_rate().
+ * @set_parent: set the clock's parent, see clk_set_parent().
+ *
+ * Group the common clock implementations together so that we
+ * don't have to keep setting the same fiels again. We leave
+ * enable in struct clk.
+ *
+ */
+struct clk_ops {
+	int (*enable) (struct clk *c, int enable);
+	int (*set_rate) (struct clk *c, unsigned long rate);
+	unsigned long (*get_rate) (struct clk *c);
+	unsigned long (*round_rate) (struct clk *c, unsigned long rate);
+	int (*set_parent) (struct clk *c, struct clk *parent);
+};
+
+struct clk {
+	struct clk *parent;
+	const char *name;
+	int use_cnt;
+	unsigned long rate;	/* in HZ */
+
+	/* programmable divider. 0 means fixed ratio to parent clock */
+	unsigned long div;
+
+	struct clk_src *src;
+	struct clk_ops *ops;
+
+	unsigned long ccu_clk_mgr_base;
+	int sel;
+};
+
+struct refclk *refclk_str_to_clk(const char *name);
+
+#define U8_MAX	((u8)~0U)
+#define U32_MAX	((u32)~0U)
+#define U64_MAX	((u64)~0U)
+
+/* The common clock framework uses u8 to represent a parent index */
+#define PARENT_COUNT_MAX	((u32)U8_MAX)
+
+#define BAD_CLK_INDEX		U8_MAX	/* Can't ever be valid */
+#define BAD_CLK_NAME		((const char *)-1)
+
+#define BAD_SCALED_DIV_VALUE	U64_MAX
+
+/*
+ * Utility macros for object flag management.  If possible, flags
+ * should be defined such that 0 is the desired default value.
+ */
+#define FLAG(type, flag)		BCM_CLK_ ## type ## _FLAGS_ ## flag
+#define FLAG_SET(obj, type, flag)	((obj)->flags |= FLAG(type, flag))
+#define FLAG_CLEAR(obj, type, flag)	((obj)->flags &= ~(FLAG(type, flag)))
+#define FLAG_FLIP(obj, type, flag)	((obj)->flags ^= FLAG(type, flag))
+#define FLAG_TEST(obj, type, flag)	(!!((obj)->flags & FLAG(type, flag)))
+
+/* Clock field state tests */
+
+#define gate_exists(gate)		FLAG_TEST(gate, GATE, EXISTS)
+#define gate_is_enabled(gate)		FLAG_TEST(gate, GATE, ENABLED)
+#define gate_is_hw_controllable(gate)	FLAG_TEST(gate, GATE, HW)
+#define gate_is_sw_controllable(gate)	FLAG_TEST(gate, GATE, SW)
+#define gate_is_sw_managed(gate)	FLAG_TEST(gate, GATE, SW_MANAGED)
+#define gate_is_no_disable(gate)	FLAG_TEST(gate, GATE, NO_DISABLE)
+
+#define gate_flip_enabled(gate)		FLAG_FLIP(gate, GATE, ENABLED)
+
+#define divider_exists(div)		FLAG_TEST(div, DIV, EXISTS)
+#define divider_is_fixed(div)		FLAG_TEST(div, DIV, FIXED)
+#define divider_has_fraction(div)	(!divider_is_fixed(div) && \
+						(div)->frac_width > 0)
+
+#define selector_exists(sel)		((sel)->width != 0)
+#define trigger_exists(trig)		FLAG_TEST(trig, TRIG, EXISTS)
+
+/* Clock type, used to tell common block what it's part of */
+enum bcm_clk_type {
+	bcm_clk_none,		/* undefined clock type */
+	bcm_clk_bus,
+	bcm_clk_core,
+	bcm_clk_peri
+};
+
+/*
+ * Gating control and status is managed by a 32-bit gate register.
+ *
+ * There are several types of gating available:
+ * - (no gate)
+ *     A clock with no gate is assumed to be always enabled.
+ * - hardware-only gating (auto-gating)
+ *     Enabling or disabling clocks with this type of gate is
+ *     managed automatically by the hardware.  Such clocks can be
+ *     considered by the software to be enabled.  The current status
+ *     of auto-gated clocks can be read from the gate status bit.
+ * - software-only gating
+ *     Auto-gating is not available for this type of clock.
+ *     Instead, software manages whether it's enabled by setting or
+ *     clearing the enable bit.  The current gate status of a gate
+ *     under software control can be read from the gate status bit.
+ *     To ensure a change to the gating status is complete, the
+ *     status bit can be polled to verify that the gate has entered
+ *     the desired state.
+ * - selectable hardware or software gating
+ *     Gating for this type of clock can be configured to be either
+ *     under software or hardware control.  Which type is in use is
+ *     determined by the hw_sw_sel bit of the gate register.
+ */
+struct bcm_clk_gate {
+	u32 offset;		/* gate register offset */
+	u32 status_bit;		/* 0: gate is disabled; 0: gatge is enabled */
+	u32 en_bit;		/* 0: disable; 1: enable */
+	u32 hw_sw_sel_bit;	/* 0: hardware gating; 1: software gating */
+	u32 flags;		/* BCM_CLK_GATE_FLAGS_* below */
+};
+
+/*
+ * Gate flags:
+ *   HW         means this gate can be auto-gated
+ *   SW         means the state of this gate can be software controlled
+ *   NO_DISABLE means this gate is (only) enabled if under software control
+ *   SW_MANAGED means the status of this gate is under software control
+ *   ENABLED    means this software-managed gate is *supposed* to be enabled
+ */
+#define BCM_CLK_GATE_FLAGS_EXISTS	((u32)1 << 0)	/* Gate is valid */
+#define BCM_CLK_GATE_FLAGS_HW		((u32)1 << 1)	/* Can auto-gate */
+#define BCM_CLK_GATE_FLAGS_SW		((u32)1 << 2)	/* Software control */
+#define BCM_CLK_GATE_FLAGS_NO_DISABLE	((u32)1 << 3)	/* HW or enabled */
+#define BCM_CLK_GATE_FLAGS_SW_MANAGED	((u32)1 << 4)	/* SW now in control */
+#define BCM_CLK_GATE_FLAGS_ENABLED	((u32)1 << 5)	/* If SW_MANAGED */
+
+/*
+ * Gate initialization macros.
+ *
+ * Any gate initially under software control will be enabled.
+ */
+
+/* A hardware/software gate initially under software control */
+#define HW_SW_GATE(_offset, _status_bit, _en_bit, _hw_sw_sel_bit)	\
+	{								\
+		.offset = (_offset),					\
+		.status_bit = (_status_bit),				\
+		.en_bit = (_en_bit),					\
+		.hw_sw_sel_bit = (_hw_sw_sel_bit),			\
+		.flags = FLAG(GATE, HW)|FLAG(GATE, SW)|			\
+			FLAG(GATE, SW_MANAGED)|FLAG(GATE, ENABLED)|	\
+			FLAG(GATE, EXISTS),				\
+	}
+
+/* A hardware/software gate initially under hardware control */
+#define HW_SW_GATE_AUTO(_offset, _status_bit, _en_bit, _hw_sw_sel_bit)	\
+	{								\
+		.offset = (_offset),					\
+		.status_bit = (_status_bit),				\
+		.en_bit = (_en_bit),					\
+		.hw_sw_sel_bit = (_hw_sw_sel_bit),			\
+		.flags = FLAG(GATE, HW)|FLAG(GATE, SW)|			\
+			FLAG(GATE, EXISTS),				\
+	}
+
+/* A hardware-or-enabled gate (enabled if not under hardware control) */
+#define HW_ENABLE_GATE(_offset, _status_bit, _en_bit, _hw_sw_sel_bit)	\
+	{								\
+		.offset = (_offset),					\
+		.status_bit = (_status_bit),				\
+		.en_bit = (_en_bit),					\
+		.hw_sw_sel_bit = (_hw_sw_sel_bit),			\
+		.flags = FLAG(GATE, HW)|FLAG(GATE, SW)|			\
+			FLAG(GATE, NO_DISABLE)|FLAG(GATE, EXISTS),	\
+	}
+
+/* A software-only gate */
+#define SW_ONLY_GATE(_offset, _status_bit, _en_bit)			\
+	{								\
+		.offset = (_offset),					\
+		.status_bit = (_status_bit),				\
+		.en_bit = (_en_bit),					\
+		.flags = FLAG(GATE, SW)|FLAG(GATE, SW_MANAGED)|		\
+			FLAG(GATE, ENABLED)|FLAG(GATE, EXISTS),		\
+	}
+
+/* A hardware-only gate */
+#define HW_ONLY_GATE(_offset, _status_bit)				\
+	{								\
+		.offset = (_offset),					\
+		.status_bit = (_status_bit),				\
+		.flags = FLAG(GATE, HW)|FLAG(GATE, EXISTS),		\
+	}
+
+/*
+ * Each clock can have zero, one, or two dividers which change the
+ * output rate of the clock.  Each divider can be either fixed or
+ * variable.  If there are two dividers, they are the "pre-divider"
+ * and the "regular" or "downstream" divider.  If there is only one,
+ * there is no pre-divider.
+ *
+ * A fixed divider is any non-zero (positive) value, and it
+ * indicates how the input rate is affected by the divider.
+ *
+ * The value of a variable divider is maintained in a sub-field of a
+ * 32-bit divider register.  The position of the field in the
+ * register is defined by its offset and width.  The value recorded
+ * in this field is always 1 less than the value it represents.
+ *
+ * In addition, a variable divider can indicate that some subset
+ * of its bits represent a "fractional" part of the divider.  Such
+ * bits comprise the low-order portion of the divider field, and can
+ * be viewed as representing the portion of the divider that lies to
+ * the right of the decimal point.  Most variable dividers have zero
+ * fractional bits.  Variable dividers with non-zero fraction width
+ * still record a value 1 less than the value they represent; the
+ * added 1 does *not* affect the low-order bit in this case, it
+ * affects the bits above the fractional part only.  (Often in this
+ * code a divider field value is distinguished from the value it
+ * represents by referring to the latter as a "divisor".)
+ *
+ * In order to avoid dealing with fractions, divider arithmetic is
+ * performed using "scaled" values.  A scaled value is one that's
+ * been left-shifted by the fractional width of a divider.  Dividing
+ * a scaled value by a scaled divisor produces the desired quotient
+ * without loss of precision and without any other special handling
+ * for fractions.
+ *
+ * The recorded value of a variable divider can be modified.  To
+ * modify either divider (or both), a clock must be enabled (i.e.,
+ * using its gate).  In addition, a trigger register (described
+ * below) must be used to commit the change, and polled to verify
+ * the change is complete.
+ */
+struct bcm_clk_div {
+	union {
+		struct {	/* variable divider */
+			u32 offset;	/* divider register offset */
+			u32 shift;	/* field shift */
+			u32 width;	/* field width */
+			u32 frac_width;	/* field fraction width */
+
+			u64 scaled_div;	/* scaled divider value */
+		};
+		u32 fixed;	/* non-zero fixed divider value */
+	};
+	u32 flags;		/* BCM_CLK_DIV_FLAGS_* below */
+};
+
+/*
+ * Divider flags:
+ *   EXISTS means this divider exists
+ *   FIXED means it is a fixed-rate divider
+ */
+#define BCM_CLK_DIV_FLAGS_EXISTS	((u32)1 << 0)	/* Divider is valid */
+#define BCM_CLK_DIV_FLAGS_FIXED		((u32)1 << 1)	/* Fixed-value */
+
+/* Divider initialization macros */
+
+/* A fixed (non-zero) divider */
+#define FIXED_DIVIDER(_value)						\
+	{								\
+		.fixed = (_value),					\
+		.flags = FLAG(DIV, EXISTS)|FLAG(DIV, FIXED),		\
+	}
+
+/* A divider with an integral divisor */
+#define DIVIDER(_offset, _shift, _width)				\
+	{								\
+		.offset = (_offset),					\
+		.shift = (_shift),					\
+		.width = (_width),					\
+		.scaled_div = BAD_SCALED_DIV_VALUE,			\
+		.flags = FLAG(DIV, EXISTS),				\
+	}
+
+/* A divider whose divisor has an integer and fractional part */
+#define FRAC_DIVIDER(_offset, _shift, _width, _frac_width)		\
+	{								\
+		.offset = (_offset),					\
+		.shift = (_shift),					\
+		.width = (_width),					\
+		.frac_width = (_frac_width),				\
+		.scaled_div = BAD_SCALED_DIV_VALUE,			\
+		.flags = FLAG(DIV, EXISTS),				\
+	}
+
+/*
+ * Clocks may have multiple "parent" clocks.  If there is more than
+ * one, a selector must be specified to define which of the parent
+ * clocks is currently in use.  The selected clock is indicated in a
+ * sub-field of a 32-bit selector register.  The range of
+ * representable selector values typically exceeds the number of
+ * available parent clocks.  Occasionally the reset value of a
+ * selector field is explicitly set to a (specific) value that does
+ * not correspond to a defined input clock.
+ *
+ * We register all known parent clocks with the common clock code
+ * using a packed array (i.e., no empty slots) of (parent) clock
+ * names, and refer to them later using indexes into that array.
+ * We maintain an array of selector values indexed by common clock
+ * index values in order to map between these common clock indexes
+ * and the selector values used by the hardware.
+ *
+ * Like dividers, a selector can be modified, but to do so a clock
+ * must be enabled, and a trigger must be used to commit the change.
+ */
+struct bcm_clk_sel {
+	u32 offset;		/* selector register offset */
+	u32 shift;		/* field shift */
+	u32 width;		/* field width */
+
+	u32 parent_count;	/* number of entries in parent_sel[] */
+	u32 *parent_sel;	/* array of parent selector values */
+	u8 clk_index;		/* current selected index in parent_sel[] */
+};
+
+/* Selector initialization macro */
+#define SELECTOR(_offset, _shift, _width)				\
+	{								\
+		.offset = (_offset),					\
+		.shift = (_shift),					\
+		.width = (_width),					\
+		.clk_index = BAD_CLK_INDEX,				\
+	}
+
+/*
+ * Making changes to a variable divider or a selector for a clock
+ * requires the use of a trigger.  A trigger is defined by a single
+ * bit within a register.  To signal a change, a 1 is written into
+ * that bit.  To determine when the change has been completed, that
+ * trigger bit is polled; the read value will be 1 while the change
+ * is in progress, and 0 when it is complete.
+ *
+ * Occasionally a clock will have more than one trigger.  In this
+ * case, the "pre-trigger" will be used when changing a clock's
+ * selector and/or its pre-divider.
+ */
+struct bcm_clk_trig {
+	u32 offset;		/* trigger register offset */
+	u32 bit;		/* trigger bit */
+	u32 flags;		/* BCM_CLK_TRIG_FLAGS_* below */
+};
+
+/*
+ * Trigger flags:
+ *   EXISTS means this trigger exists
+ */
+#define BCM_CLK_TRIG_FLAGS_EXISTS	((u32)1 << 0)	/* Trigger is valid */
+
+/* Trigger initialization macro */
+#define TRIGGER(_offset, _bit)						\
+	{								\
+		.offset = (_offset),					\
+		.bit = (_bit),						\
+		.flags = FLAG(TRIG, EXISTS),				\
+	}
+
+struct bus_clk_data {
+	struct bcm_clk_gate gate;
+};
+
+struct core_clk_data {
+	struct bcm_clk_gate gate;
+};
+
+struct peri_clk_data {
+	struct bcm_clk_gate gate;
+	struct bcm_clk_trig pre_trig;
+	struct bcm_clk_div pre_div;
+	struct bcm_clk_trig trig;
+	struct bcm_clk_div div;
+	struct bcm_clk_sel sel;
+	const char *clocks[];	/* must be last; use CLOCKS() to declare */
+};
+#define CLOCKS(...)	{ __VA_ARGS__, NULL, }
+#define NO_CLOCKS	{ NULL, }	/* Must use of no parent clocks */
+
+struct refclk {
+	struct clk clk;
+};
+
+struct peri_clock {
+	struct clk clk;
+	struct peri_clk_data *data;
+};
+
+struct ccu_clock {
+	struct clk clk;
+
+	int num_policy_masks;
+	unsigned long policy_freq_offset;
+	int freq_bit_shift;	/* 8 for most CCUs */
+	unsigned long policy_ctl_offset;
+	unsigned long policy0_mask_offset;
+	unsigned long policy1_mask_offset;
+	unsigned long policy2_mask_offset;
+	unsigned long policy3_mask_offset;
+	unsigned long policy0_mask2_offset;
+	unsigned long policy1_mask2_offset;
+	unsigned long policy2_mask2_offset;
+	unsigned long policy3_mask2_offset;
+	unsigned long lvm_en_offset;
+
+	int freq_id;
+	unsigned long *freq_tbl;
+};
+
+struct bus_clock {
+	struct clk clk;
+	struct bus_clk_data *data;
+	unsigned long *freq_tbl;
+};
+
+struct ref_clock {
+	struct clk clk;
+};
+
+static inline int is_same_clock(struct clk *a, struct clk *b)
+{
+	return (a == b);
+}
+
+#define to_clk(p) (&((p)->clk))
+#define name_to_clk(name) (&((name##_clk).clk))
+/* declare a struct clk_lookup */
+#define CLK_LK(name) \
+{.con_id = __stringify(name##_clk), .clk = name_to_clk(name),}
+
+static inline struct refclk *to_refclk(struct clk *clock)
+{
+	return container_of(clock, struct refclk, clk);
+}
+
+static inline struct peri_clock *to_peri_clk(struct clk *clock)
+{
+	return container_of(clock, struct peri_clock, clk);
+}
+
+static inline struct ccu_clock *to_ccu_clk(struct clk *clock)
+{
+	return container_of(clock, struct ccu_clock, clk);
+}
+
+static inline struct bus_clock *to_bus_clk(struct clk *clock)
+{
+	return container_of(clock, struct bus_clock, clk);
+}
+
+static inline struct ref_clock *to_ref_clk(struct clk *clock)
+{
+	return container_of(clock, struct ref_clock, clk);
+}
+
+extern struct clk_ops peri_clk_ops;
+extern struct clk_ops ccu_clk_ops;
+extern struct clk_ops bus_clk_ops;
+extern struct clk_ops ref_clk_ops;
+
+extern int clk_get_and_enable(char *clkstr);
diff --git a/arch/arm/cpu/armv7/bcm281xx/clk-sdio.c b/arch/arm/cpu/armv7/bcm281xx/clk-sdio.c
new file mode 100644
index 0000000..49badcb
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/clk-sdio.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/arch/sysmap.h>
+#include <asm/kona-common/clk.h>
+#include "clk-core.h"
+
+/* Enable appropriate clocks for an SDIO port */
+int clk_sdio_enable(void *base, u32 rate, u32 *actual_ratep)
+{
+	int ret;
+	struct clk *c;
+
+	char *clkstr;
+	char *slpstr;
+	char *ahbstr;
+
+	switch ((u32) base) {
+	case CONFIG_SYS_SDIO_BASE0:
+		clkstr = CONFIG_SYS_SDIO0 "_clk";
+		ahbstr = CONFIG_SYS_SDIO0 "_ahb_clk";
+		slpstr = CONFIG_SYS_SDIO0 "_sleep_clk";
+		break;
+	case CONFIG_SYS_SDIO_BASE1:
+		clkstr = CONFIG_SYS_SDIO1 "_clk";
+		ahbstr = CONFIG_SYS_SDIO1 "_ahb_clk";
+		slpstr = CONFIG_SYS_SDIO1 "_sleep_clk";
+		break;
+	case CONFIG_SYS_SDIO_BASE2:
+		clkstr = CONFIG_SYS_SDIO2 "_clk";
+		ahbstr = CONFIG_SYS_SDIO2 "_ahb_clk";
+		slpstr = CONFIG_SYS_SDIO2 "_sleep_clk";
+		break;
+	case CONFIG_SYS_SDIO_BASE3:
+		clkstr = CONFIG_SYS_SDIO3 "_clk";
+		ahbstr = CONFIG_SYS_SDIO3 "_ahb_clk";
+		slpstr = CONFIG_SYS_SDIO3 "_sleep_clk";
+		break;
+	default:
+		printf("%s: base 0x%p not found\n", __func__, base);
+		return -EINVAL;
+	}
+
+	ret = clk_get_and_enable(ahbstr);
+	if (ret)
+		return ret;
+
+	ret = clk_get_and_enable(slpstr);
+	if (ret)
+		return ret;
+
+	c = clk_get(clkstr);
+	if (c) {
+		ret = clk_set_rate(c, rate);
+		if (ret)
+			return ret;
+
+		ret = clk_enable(c);
+		if (ret)
+			return ret;
+	} else {
+		printf("%s: Couldn't find %s\n", __func__, clkstr);
+		return -EINVAL;
+	}
+	*actual_ratep = rate;
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/bcm281xx/reset.c b/arch/arm/cpu/armv7/bcm281xx/reset.c
new file mode 100644
index 0000000..3beb0ed
--- /dev/null
+++ b/arch/arm/cpu/armv7/bcm281xx/reset.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/sysmap.h>
+
+#define EN_MASK		0x08000000	/* Enable timer */
+#define SRSTEN_MASK	0x04000000	/* Enable soft reset */
+#define CLKS_SHIFT	20		/* Clock period shift */
+#define LD_SHIFT	0		/* Reload value shift */
+
+void reset_cpu(ulong ignored)
+{
+	/*
+	 * Set WD enable, RST enable,
+	 * 3.9 msec clock period (8), reload value (8*3.9ms)
+	 */
+	u32 reg = EN_MASK + SRSTEN_MASK + (8 << CLKS_SHIFT) + (8 << LD_SHIFT);
+	writel(reg, SECWD2_BASE_ADDR);
+
+	while (1)
+		;	/* loop forever till reset */
+}
diff --git a/arch/arm/include/asm/arch-bcm281xx/gpio.h b/arch/arm/include/asm/arch-bcm281xx/gpio.h
new file mode 100644
index 0000000..1b40a96
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm281xx/gpio.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#ifndef __ARCH_BCM281XX_GPIO_H
+#define __ARCH_BCM281XX_GPIO_H
+
+/*
+ * Empty file - cmd_gpio.c requires this. The implementation
+ * is in drivers/gpio/kona_gpio.c instead of inlined here.
+ */
+
+#endif
diff --git a/arch/arm/include/asm/arch-bcm281xx/sysmap.h b/arch/arm/include/asm/arch-bcm281xx/sysmap.h
new file mode 100644
index 0000000..880b4e0
--- /dev/null
+++ b/arch/arm/include/asm/arch-bcm281xx/sysmap.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#ifndef __ARCH_BCM281XX_SYSMAP_H
+
+#define BSC1_BASE_ADDR		0x3e016000
+#define BSC2_BASE_ADDR		0x3e017000
+#define BSC3_BASE_ADDR		0x3e018000
+#define GPIO2_BASE_ADDR		0x35003000
+#define KONA_MST_CLK_BASE_ADDR	0x3f001000
+#define KONA_SLV_CLK_BASE_ADDR	0x3e011000
+#define PMU_BSC_BASE_ADDR	0x3500d000
+#define PWRMGR_BASE_ADDR	0x35010000
+#define SDIO1_BASE_ADDR		0x3f180000
+#define SDIO2_BASE_ADDR		0x3f190000
+#define SDIO3_BASE_ADDR		0x3f1a0000
+#define SDIO4_BASE_ADDR		0x3f1b0000
+#define SECWD_BASE_ADDR		0x3500c000
+#define SECWD2_BASE_ADDR	0x35002f40
+#define TIMER_BASE_ADDR		0x3e00d000
+
+#endif
diff --git a/include/bitfield.h b/include/bitfield.h
new file mode 100644
index 0000000..ec4815c
--- /dev/null
+++ b/include/bitfield.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+/*
+ * Bitfield operations
+ *
+ * These are generic bitfield operations which allow manipulation of variable
+ * width bitfields within a word. One use of this would be to use data tables
+ * to determine how to reprogram fields within R/W hardware registers.
+ *
+ * Example:
+ *
+ *            old_reg_val
+ * +--------+----+---+--+-----+----------+
+ * |        |    |   |  | old |          |
+ * +--------+----+---+--+-----+----------+
+ *
+ *            new_reg_val
+ * +--------+----+---+--+-----+----------+
+ * |        |    |   |  | new |          |
+ * +--------+----+---+--+-----+----------+
+ *
+ * mask = bitfield_mask(10, 5);
+ * old = bitfield_extract(old_reg_val, 10, 5);
+ * new_reg_val = bitfield_replace(old_reg_val, 10, 5, new);
+ *
+ * The numbers 10 and 5 could for example come from data
+ * tables which describe all bitfields in all registers.
+ */
+
+#include <linux/types.h>
+
+/* Produces a mask of set bits covering a range of a uint value */
+static inline uint bitfield_mask(uint shift, uint width)
+{
+	return ((1 << width) - 1) << shift;
+}
+
+/* Extract the value of a bitfield found within a given register value */
+static inline uint bitfield_extract(uint reg_val, uint shift, uint width)
+{
+	return (reg_val & bitfield_mask(shift, width)) >> shift;
+}
+
+/*
+ * Replace the value of a bitfield found within a given register value
+ * Returns the newly modified uint value with the replaced field.
+ */
+static inline uint bitfield_replace(uint reg_val, uint shift, uint width,
+				    uint bitfield_val)
+{
+	uint mask = bitfield_mask(shift, width);
+
+	return (reg_val & ~mask) | (bitfield_val << shift);
+}