clk: cygnus: add clock support for Broadcom Cygnus

The Broadcom Cygnus SoC is architected under the iProc architecture. It
has the following PLLs: ARMPLL, GENPLL, LCPLL0, MIPIPLL, all dervied
from an onboard crystal. Cygnus also has various ASIU clocks that are
derived directly from the onboard crystal.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>

2 files changed, 266 insertions, 0 deletions

diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
index 0facbbc5652c..8a7a477862c7 100644
--- a/drivers/clk/bcm/Makefile
+++ b/drivers/clk/bcm/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_CLK_BCM_KONA)	+= clk-kona-setup.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm281xx.o
 obj-$(CONFIG_CLK_BCM_KONA)	+= clk-bcm21664.o
 obj-$(CONFIG_COMMON_CLK_IPROC)	+= clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o
+obj-$(CONFIG_ARCH_BCM_CYGNUS)	+= clk-cygnus.o
diff --git a/drivers/clk/bcm/clk-cygnus.c b/drivers/clk/bcm/clk-cygnus.c
new file mode 100644
index 000000000000..316c60337661
--- /dev/null
+++ b/drivers/clk/bcm/clk-cygnus.c
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/clkdev.h>
+#include <linux/of_address.h>
+#include <linux/delay.h>
+
+#include <dt-bindings/clock/bcm-cygnus.h>
+#include "clk-iproc.h"
+
+#define reg_val(o, s, w) { .offset = o, .shift = s, .width = w, }
+
+#define aon_val(o, pw, ps, is) { .offset = o, .pwr_width = pw, \
+	.pwr_shift = ps, .iso_shift = is }
+
+#define sw_ctrl_val(o, s) { .offset = o, .shift = s, }
+
+#define asiu_div_val(o, es, hs, hw, ls, lw) \
+		{ .offset = o, .en_shift = es, .high_shift = hs, \
+		.high_width = hw, .low_shift = ls, .low_width = lw }
+
+#define reset_val(o, rs, prs, kis, kiw, kps, kpw, kas, kaw) { .offset = o, \
+	.reset_shift = rs, .p_reset_shift = prs, .ki_shift = kis, \
+	.ki_width = kiw, .kp_shift = kps, .kp_width = kpw, .ka_shift = kas, \
+	.ka_width = kaw }
+
+#define vco_ctrl_val(uo, lo) { .u_offset = uo, .l_offset = lo }
+
+#define enable_val(o, es, hs, bs) { .offset = o, .enable_shift = es, \
+	.hold_shift = hs, .bypass_shift = bs }
+
+#define asiu_gate_val(o, es) { .offset = o, .en_shift = es }
+
+static void __init cygnus_armpll_init(struct device_node *node)
+{
+	iproc_armpll_setup(node);
+}
+CLK_OF_DECLARE(cygnus_armpll, "brcm,cygnus-armpll", cygnus_armpll_init);
+
+static const struct iproc_pll_ctrl genpll = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_HAS_NDIV_FRAC |
+		IPROC_CLK_PLL_NEEDS_SW_CFG,
+	.aon = aon_val(0x0, 2, 1, 0),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 3),
+	.sw_ctrl = sw_ctrl_val(0x10, 31),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl genpll_clk[] = {
+	[BCM_CYGNUS_GENPLL_AXI21_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AXI21_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 6, 0, 12),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_250MHZ_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_250MHZ_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 7, 1, 13),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_IHOST_SYS_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_IHOST_SYS_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 8, 2, 14),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_GENPLL_ENET_SW_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_ENET_SW_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 9, 3, 15),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_GENPLL_AUDIO_125_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_AUDIO_125_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 10, 4, 16),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_GENPLL_CAN_CLK] = {
+		.channel = BCM_CYGNUS_GENPLL_CAN_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x4, 11, 5, 17),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_genpll_clk_init(struct device_node *node)
+{
+	iproc_pll_clk_setup(node, &genpll, NULL, 0, genpll_clk,
+			    ARRAY_SIZE(genpll_clk));
+}
+CLK_OF_DECLARE(cygnus_genpll, "brcm,cygnus-genpll", cygnus_genpll_clk_init);
+
+static const struct iproc_pll_ctrl lcpll0 = {
+	.flags = IPROC_CLK_AON | IPROC_CLK_PLL_NEEDS_SW_CFG,
+	.aon = aon_val(0x0, 2, 5, 4),
+	.reset = reset_val(0x0, 31, 30, 27, 3, 23, 4, 19, 4),
+	.sw_ctrl = sw_ctrl_val(0x4, 31),
+	.ndiv_int = reg_val(0x4, 16, 10),
+	.pdiv = reg_val(0x4, 26, 4),
+	.vco_ctrl = vco_ctrl_val(0x10, 0x14),
+	.status = reg_val(0x18, 12, 1),
+};
+
+static const struct iproc_clk_ctrl lcpll0_clk[] = {
+	[BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_PCIE_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 7, 1, 13),
+		.mdiv = reg_val(0x8, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_DDR_PHY_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_DDR_PHY_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 8, 2, 14),
+		.mdiv = reg_val(0x8, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SDIO_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SDIO_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 9, 3, 15),
+		.mdiv = reg_val(0x8, 20, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_USB_PHY_REF_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 10, 4, 16),
+		.mdiv = reg_val(0xc, 0, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_SMART_CARD_CLK] = {
+		.channel = BCM_CYGNUS_LCPLL0_SMART_CARD_CLK,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 11, 5, 17),
+		.mdiv = reg_val(0xc, 10, 8),
+	},
+	[BCM_CYGNUS_LCPLL0_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_LCPLL0_CH5_UNUSED,
+		.flags = IPROC_CLK_AON,
+		.enable = enable_val(0x0, 12, 6, 18),
+		.mdiv = reg_val(0xc, 20, 8),
+	},
+};
+
+static void __init cygnus_lcpll0_clk_init(struct device_node *node)
+{
+	iproc_pll_clk_setup(node, &lcpll0, NULL, 0, lcpll0_clk,
+			    ARRAY_SIZE(lcpll0_clk));
+}
+CLK_OF_DECLARE(cygnus_lcpll0, "brcm,cygnus-lcpll0", cygnus_lcpll0_clk_init);
+
+/*
+ * MIPI PLL VCO frequency parameter table
+ */
+static const struct iproc_pll_vco_param mipipll_vco_params[] = {
+	/* rate (Hz) ndiv_int ndiv_frac pdiv */
+	{ 750000000UL,   30,     0,        1 },
+	{ 1000000000UL,  40,     0,        1 },
+	{ 1350000000ul,  54,     0,        1 },
+	{ 2000000000UL,  80,     0,        1 },
+	{ 2100000000UL,  84,     0,        1 },
+	{ 2250000000UL,  90,     0,        1 },
+	{ 2500000000UL,  100,    0,        1 },
+	{ 2700000000UL,  54,     0,        0 },
+	{ 2975000000UL,  119,    0,        1 },
+	{ 3100000000UL,  124,    0,        1 },
+	{ 3150000000UL,  126,    0,        1 },
+};
+
+static const struct iproc_pll_ctrl mipipll = {
+	.flags = IPROC_CLK_PLL_ASIU | IPROC_CLK_PLL_HAS_NDIV_FRAC |
+		 IPROC_CLK_NEEDS_READ_BACK,
+	.aon = aon_val(0x0, 4, 17, 16),
+	.asiu = asiu_gate_val(0x0, 3),
+	.reset = reset_val(0x0, 11, 10, 4, 3, 0, 4, 7, 4),
+	.ndiv_int = reg_val(0x10, 20, 10),
+	.ndiv_frac = reg_val(0x10, 0, 20),
+	.pdiv = reg_val(0x14, 0, 4),
+	.vco_ctrl = vco_ctrl_val(0x18, 0x1c),
+	.status = reg_val(0x28, 12, 1),
+};
+
+static const struct iproc_clk_ctrl mipipll_clk[] = {
+	[BCM_CYGNUS_MIPIPLL_CH0_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH0_UNUSED,
+		.flags = IPROC_CLK_NEEDS_READ_BACK,
+		.enable = enable_val(0x4, 12, 6, 18),
+		.mdiv = reg_val(0x20, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH1_LCD] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH1_LCD,
+		.flags = IPROC_CLK_NEEDS_READ_BACK,
+		.enable = enable_val(0x4, 13, 7, 19),
+		.mdiv = reg_val(0x20, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH2_V3D] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH2_V3D,
+		.flags = IPROC_CLK_NEEDS_READ_BACK,
+		.enable = enable_val(0x4, 14, 8, 20),
+		.mdiv = reg_val(0x20, 20, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH3_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH3_UNUSED,
+		.flags = IPROC_CLK_NEEDS_READ_BACK,
+		.enable = enable_val(0x4, 15, 9, 21),
+		.mdiv = reg_val(0x24, 0, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH4_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH4_UNUSED,
+		.flags = IPROC_CLK_NEEDS_READ_BACK,
+		.enable = enable_val(0x4, 16, 10, 22),
+		.mdiv = reg_val(0x24, 10, 8),
+	},
+	[BCM_CYGNUS_MIPIPLL_CH5_UNUSED] = {
+		.channel = BCM_CYGNUS_MIPIPLL_CH5_UNUSED,
+		.flags = IPROC_CLK_NEEDS_READ_BACK,
+		.enable = enable_val(0x4, 17, 11, 23),
+		.mdiv = reg_val(0x24, 20, 8),
+	},
+};
+
+static void __init cygnus_mipipll_clk_init(struct device_node *node)
+{
+	iproc_pll_clk_setup(node, &mipipll, mipipll_vco_params,
+			    ARRAY_SIZE(mipipll_vco_params), mipipll_clk,
+			    ARRAY_SIZE(mipipll_clk));
+}
+CLK_OF_DECLARE(cygnus_mipipll, "brcm,cygnus-mipipll", cygnus_mipipll_clk_init);
+
+static const struct iproc_asiu_div asiu_div[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] = asiu_div_val(0x0, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_ADC_CLK] = asiu_div_val(0x4, 31, 16, 10, 0, 10),
+	[BCM_CYGNUS_ASIU_PWM_CLK] = asiu_div_val(0x8, 31, 16, 10, 0, 10),
+};
+
+static const struct iproc_asiu_gate asiu_gate[] = {
+	[BCM_CYGNUS_ASIU_KEYPAD_CLK] = asiu_gate_val(0x0, 7),
+	[BCM_CYGNUS_ASIU_ADC_CLK] = asiu_gate_val(0x0, 9),
+	[BCM_CYGNUS_ASIU_PWM_CLK] = asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
+};
+
+static void __init cygnus_asiu_init(struct device_node *node)
+{
+	iproc_asiu_setup(node, asiu_div, asiu_gate, ARRAY_SIZE(asiu_div));
+}
+CLK_OF_DECLARE(cygnus_asiu_clk, "brcm,cygnus-asiu-clk", cygnus_asiu_init);