rockchip: clk: Add rv1108 clock driver

Add clock driver support for Rockchip rv1108 soc

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 224 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
index 8dc60f8..e404c0c 100644
--- a/drivers/clk/rockchip/Makefile
+++ b/drivers/clk/rockchip/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3328) += clk_rk3328.o
 obj-$(CONFIG_ROCKCHIP_RK3368) += clk_rk3368.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += clk_rk3399.o
+obj-$(CONFIG_ROCKCHIP_RV1108) += clk_rv1108.o
diff --git a/drivers/clk/rockchip/clk_rv1108.c b/drivers/clk/rockchip/clk_rv1108.c
new file mode 100644
index 0000000..0a3ba3b
--- /dev/null
+++ b/drivers/clk/rockchip/clk_rv1108.c
@@ -0,0 +1,223 @@
+/*
+ * (C) Copyright 2016 Rockchip Electronics Co., Ltd
+ * Author: Andy Yan <andy.yan@rock-chips.com>
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rv1108.h>
+#include <asm/arch/hardware.h>
+#include <dm/lists.h>
+#include <dt-bindings/clock/rv1108-cru.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+	VCO_MAX_HZ	= 2400U * 1000000,
+	VCO_MIN_HZ	= 600 * 1000000,
+	OUTPUT_MAX_HZ	= 2400U * 1000000,
+	OUTPUT_MIN_HZ	= 24 * 1000000,
+};
+
+#define RATE_TO_DIV(input_rate, output_rate) \
+	((input_rate) / (output_rate) - 1);
+
+#define DIV_TO_RATE(input_rate, div)	((input_rate) / ((div) + 1))
+
+#define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
+	.refdiv = _refdiv,\
+	.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
+	.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
+	_Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
+			 OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
+			 #hz "Hz cannot be hit with PLL "\
+			 "divisors on line " __stringify(__LINE__));
+
+/* use interge mode*/
+static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
+static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
+
+static inline int rv1108_pll_id(enum rk_clk_id clk_id)
+{
+	int id = 0;
+
+	switch (clk_id) {
+	case CLK_ARM:
+	case CLK_DDR:
+		id = clk_id - 1;
+		break;
+	case CLK_GENERAL:
+		id = 2;
+		break;
+	default:
+		printf("invalid pll id:%d\n", clk_id);
+		id = -1;
+		break;
+	}
+
+	return id;
+}
+
+static uint32_t rkclk_pll_get_rate(struct rv1108_cru *cru,
+				   enum rk_clk_id clk_id)
+{
+	uint32_t refdiv, fbdiv, postdiv1, postdiv2;
+	uint32_t con0, con1, con3;
+	int pll_id = rv1108_pll_id(clk_id);
+	struct rv1108_pll *pll = &cru->pll[pll_id];
+	uint32_t freq;
+
+	con3 = readl(&pll->con3);
+
+	if (con3 & WORK_MODE_MASK) {
+		con0 = readl(&pll->con0);
+		con1 = readl(&pll->con1);
+		fbdiv = (con0 >> FBDIV_SHIFT) & FBDIV_MASK;
+		postdiv1 = (con1 & POSTDIV1_MASK) >> POSTDIV1_SHIFT;
+		postdiv2 = (con1 & POSTDIV2_MASK) >> POSTDIV2_SHIFT;
+		refdiv = (con1 & REFDIV_MASK) >> REFDIV_SHIFT;
+		freq = (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
+	} else {
+		freq = OSC_HZ;
+	}
+
+	return freq;
+}
+
+static int rv1108_mac_set_clk(struct rv1108_cru *cru, ulong rate)
+{
+	uint32_t con = readl(&cru->clksel_con[24]);
+	ulong pll_rate;
+	uint8_t div;
+
+	if ((con >> MAC_PLL_SEL_SHIFT) & MAC_PLL_SEL_GPLL)
+		pll_rate = rkclk_pll_get_rate(cru, CLK_GENERAL);
+	else
+		pll_rate = rkclk_pll_get_rate(cru, CLK_ARM);
+
+	/*default set 50MHZ for gmac*/
+	if (!rate)
+		rate = 50000000;
+
+	div = DIV_ROUND_UP(pll_rate, rate) - 1;
+	if (div <= 0x1f)
+		rk_clrsetreg(&cru->clksel_con[24], MAC_CLK_DIV_MASK,
+			     div << MAC_CLK_DIV_SHIFT);
+	else
+		debug("Unsupported div for gmac:%d\n", div);
+
+	return DIV_TO_RATE(pll_rate, div);
+}
+
+static int rv1108_sfc_set_clk(struct rv1108_cru *cru, uint rate)
+{
+	u32 con = readl(&cru->clksel_con[27]);
+	u32 pll_rate;
+	u32 div;
+
+	if ((con >> SFC_PLL_SEL_SHIFT) && SFC_PLL_SEL_GPLL)
+		pll_rate = rkclk_pll_get_rate(cru, CLK_GENERAL);
+	else
+		pll_rate = rkclk_pll_get_rate(cru, CLK_DDR);
+
+	div = DIV_ROUND_UP(pll_rate, rate) - 1;
+	if (div <= 0x3f)
+		rk_clrsetreg(&cru->clksel_con[27], SFC_CLK_DIV_MASK,
+			     div << SFC_CLK_DIV_SHIFT);
+	else
+		debug("Unsupported sfc clk rate:%d\n", rate);
+
+	return DIV_TO_RATE(pll_rate, div);
+}
+
+static ulong rv1108_clk_get_rate(struct clk *clk)
+{
+	struct rv1108_clk_priv *priv = dev_get_priv(clk->dev);
+
+	switch (clk->id) {
+	case 0 ... 63:
+		return rkclk_pll_get_rate(priv->cru, clk->id);
+	default:
+		return -ENOENT;
+	}
+}
+
+static ulong rv1108_clk_set_rate(struct clk *clk, ulong rate)
+{
+	struct rv1108_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong new_rate;
+
+	switch (clk->id) {
+	case SCLK_MAC:
+		new_rate = rv1108_mac_set_clk(priv->cru, rate);
+		break;
+	case SCLK_SFC:
+		new_rate = rv1108_sfc_set_clk(priv->cru, rate);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return new_rate;
+}
+
+static const struct clk_ops rv1108_clk_ops = {
+	.get_rate	= rv1108_clk_get_rate,
+	.set_rate	= rv1108_clk_set_rate,
+};
+
+static void rkclk_init(struct rv1108_cru *cru)
+{
+	unsigned int apll = rkclk_pll_get_rate(cru, CLK_ARM);
+	unsigned int dpll = rkclk_pll_get_rate(cru, CLK_DDR);
+	unsigned int gpll = rkclk_pll_get_rate(cru, CLK_GENERAL);
+
+	rk_clrsetreg(&cru->clksel_con[0], CORE_CLK_DIV_MASK,
+		     0 << MAC_CLK_DIV_SHIFT);
+
+	printf("APLL: %d DPLL:%d GPLL:%d\n", apll, dpll, gpll);
+}
+
+static int rv1108_clk_probe(struct udevice *dev)
+{
+	struct rv1108_clk_priv *priv = dev_get_priv(dev);
+
+	priv->cru = (struct rv1108_cru *)devfdt_get_addr(dev);
+
+	rkclk_init(priv->cru);
+
+	return 0;
+}
+
+static int rv1108_clk_bind(struct udevice *dev)
+{
+	int ret;
+
+	/* The reset driver does not have a device node, so bind it here */
+	ret = device_bind_driver(gd->dm_root, "rv1108_sysreset", "reset", &dev);
+	if (ret)
+		error("No Rv1108 reset driver: ret=%d\n", ret);
+
+	return 0;
+}
+
+static const struct udevice_id rv1108_clk_ids[] = {
+	{ .compatible = "rockchip,rv1108-cru" },
+	{ }
+};
+
+U_BOOT_DRIVER(clk_rv1108) = {
+	.name		= "clk_rv1108",
+	.id		= UCLASS_CLK,
+	.of_match	= rv1108_clk_ids,
+	.priv_auto_alloc_size = sizeof(struct rv1108_clk_priv),
+	.ops		= &rv1108_clk_ops,
+	.bind		= rv1108_clk_bind,
+	.probe		= rv1108_clk_probe,
+};