rockchip: rk322x: add clock driver

Add clock driver init support for:
- cpu, bus clock init;
- emmc, sdmmc clock;
- ddr clock;

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Fixed format specified (%x -> %p) in clk_rk322x.c:
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

2 files changed, 414 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
index e404c0cdb9..c50aff2e93 100644
--- a/drivers/clk/rockchip/Makefile
+++ b/drivers/clk/rockchip/Makefile
@@ -6,6 +6,7 @@
 
 obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
 obj-$(CONFIG_ROCKCHIP_RK3188) += clk_rk3188.o
+obj-$(CONFIG_ROCKCHIP_RK322X) += clk_rk322x.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3328) += clk_rk3328.o
 obj-$(CONFIG_ROCKCHIP_RK3368) += clk_rk3368.o
diff --git a/drivers/clk/rockchip/clk_rk322x.c b/drivers/clk/rockchip/clk_rk322x.c
new file mode 100644
index 0000000000..fdeb816e23
--- /dev/null
+++ b/drivers/clk/rockchip/clk_rk322x.c
@@ -0,0 +1,413 @@
+/*
+ * (C) Copyright 2017 Rockchip Electronics Co., Ltd
+ *
+ * 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_rk322x.h>
+#include <asm/arch/hardware.h>
+#include <dm/lists.h>
+#include <dt-bindings/clock/rk3228-cru.h>
+#include <linux/log2.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+	VCO_MAX_HZ	= 3200U * 1000000,
+	VCO_MIN_HZ	= 800 * 1000000,
+	OUTPUT_MAX_HZ	= 3200U * 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 integer 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 int rkclk_set_pll(struct rk322x_cru *cru, enum rk_clk_id clk_id,
+			 const struct pll_div *div)
+{
+	int pll_id = rk_pll_id(clk_id);
+	struct rk322x_pll *pll = &cru->pll[pll_id];
+
+	/* All PLLs have same VCO and output frequency range restrictions. */
+	uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
+	uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
+
+	debug("PLL at %p: fb=%d, ref=%d, pst1=%d, pst2=%d, vco=%u Hz, output=%u Hz\n",
+	      pll, div->fbdiv, div->refdiv, div->postdiv1,
+	      div->postdiv2, vco_hz, output_hz);
+	assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
+	       output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
+
+	/* use integer mode */
+	rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
+	/* Power down */
+	rk_setreg(&pll->con1, 1 << PLL_PD_SHIFT);
+
+	rk_clrsetreg(&pll->con0,
+		     PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
+		     (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
+	rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
+		     (div->postdiv2 << PLL_POSTDIV2_SHIFT |
+		     div->refdiv << PLL_REFDIV_SHIFT));
+
+	/* Power Up */
+	rk_clrreg(&pll->con1, 1 << PLL_PD_SHIFT);
+
+	/* waiting for pll lock */
+	while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
+		udelay(1);
+
+	return 0;
+}
+
+static void rkclk_init(struct rk322x_cru *cru)
+{
+	u32 aclk_div;
+	u32 hclk_div;
+	u32 pclk_div;
+
+	/* pll enter slow-mode */
+	rk_clrsetreg(&cru->cru_mode_con,
+		     GPLL_MODE_MASK | APLL_MODE_MASK,
+		     GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
+		     APLL_MODE_SLOW << APLL_MODE_SHIFT);
+
+	/* init pll */
+	rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
+	rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
+
+	/*
+	 * select apll as cpu/core clock pll source and
+	 * set up dependent divisors for PERI and ACLK clocks.
+	 * core hz : apll = 1:1
+	 */
+	aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
+	assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
+
+	pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
+	assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
+
+	rk_clrsetreg(&cru->cru_clksel_con[0],
+		     CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
+		     CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
+		     0 << CORE_DIV_CON_SHIFT);
+
+	rk_clrsetreg(&cru->cru_clksel_con[1],
+		     CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
+		     aclk_div << CORE_ACLK_DIV_SHIFT |
+		     pclk_div << CORE_PERI_DIV_SHIFT);
+
+	/*
+	 * select apll as pd_bus bus clock source and
+	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+	 */
+	aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
+	assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
+
+	pclk_div = GPLL_HZ / BUS_PCLK_HZ - 1;
+	assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
+
+	hclk_div = GPLL_HZ / BUS_HCLK_HZ - 1;
+	assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
+
+	rk_clrsetreg(&cru->cru_clksel_con[0],
+		     BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
+		     BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
+		     aclk_div << BUS_ACLK_DIV_SHIFT);
+
+	rk_clrsetreg(&cru->cru_clksel_con[1],
+		     BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
+		     pclk_div << BUS_PCLK_DIV_SHIFT |
+		     hclk_div << BUS_HCLK_DIV_SHIFT);
+
+	/*
+	 * select gpll as pd_peri bus clock source and
+	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+	 */
+	aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
+	assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
+
+	hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
+	assert((1 << hclk_div) * PERI_HCLK_HZ ==
+		PERI_ACLK_HZ && (hclk_div < 0x4));
+
+	pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
+	assert((1 << pclk_div) * PERI_PCLK_HZ ==
+		PERI_ACLK_HZ && pclk_div < 0x8);
+
+	rk_clrsetreg(&cru->cru_clksel_con[10],
+		     PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
+		     PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
+		     PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
+		     pclk_div << PERI_PCLK_DIV_SHIFT |
+		     hclk_div << PERI_HCLK_DIV_SHIFT |
+		     aclk_div << PERI_ACLK_DIV_SHIFT);
+
+	/* PLL enter normal-mode */
+	rk_clrsetreg(&cru->cru_mode_con,
+		     GPLL_MODE_MASK | APLL_MODE_MASK,
+		     GPLL_MODE_NORM << GPLL_MODE_SHIFT |
+		     APLL_MODE_NORM << APLL_MODE_SHIFT);
+}
+
+/* Get pll rate by id */
+static uint32_t rkclk_pll_get_rate(struct rk322x_cru *cru,
+				   enum rk_clk_id clk_id)
+{
+	uint32_t refdiv, fbdiv, postdiv1, postdiv2;
+	uint32_t con;
+	int pll_id = rk_pll_id(clk_id);
+	struct rk322x_pll *pll = &cru->pll[pll_id];
+	static u8 clk_shift[CLK_COUNT] = {
+		0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
+		GPLL_MODE_SHIFT, 0xff
+	};
+	static u32 clk_mask[CLK_COUNT] = {
+		0xff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xff,
+		GPLL_MODE_MASK, 0xff
+	};
+	uint shift;
+	uint mask;
+
+	con = readl(&cru->cru_mode_con);
+	shift = clk_shift[clk_id];
+	mask = clk_mask[clk_id];
+
+	switch ((con & mask) >> shift) {
+	case GPLL_MODE_SLOW:
+		return OSC_HZ;
+	case GPLL_MODE_NORM:
+
+		/* normal mode */
+		con = readl(&pll->con0);
+		postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
+		fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
+		con = readl(&pll->con1);
+		postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
+		refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
+		return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
+	default:
+		return 32768;
+	}
+}
+
+static ulong rockchip_mmc_get_clk(struct rk322x_cru *cru, uint clk_general_rate,
+				  int periph)
+{
+	uint src_rate;
+	uint div, mux;
+	u32 con;
+
+	switch (periph) {
+	case HCLK_EMMC:
+	case SCLK_EMMC:
+		con = readl(&cru->cru_clksel_con[11]);
+		mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
+		con = readl(&cru->cru_clksel_con[12]);
+		div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
+		break;
+	case HCLK_SDMMC:
+	case SCLK_SDMMC:
+		con = readl(&cru->cru_clksel_con[11]);
+		mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
+		div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
+	return DIV_TO_RATE(src_rate, div);
+}
+
+static ulong rockchip_mmc_set_clk(struct rk322x_cru *cru, uint clk_general_rate,
+				  int periph, uint freq)
+{
+	int src_clk_div;
+	int mux;
+
+	debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
+
+	/* mmc clock auto divide 2 in internal */
+	src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
+
+	if (src_clk_div > 0x7f) {
+		src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
+		mux = EMMC_SEL_24M;
+	} else {
+		mux = EMMC_SEL_GPLL;
+	}
+
+	switch (periph) {
+	case HCLK_EMMC:
+	case SCLK_EMMC:
+		rk_clrsetreg(&cru->cru_clksel_con[11],
+			     EMMC_PLL_MASK,
+			     mux << EMMC_PLL_SHIFT);
+		rk_clrsetreg(&cru->cru_clksel_con[12],
+			     EMMC_DIV_MASK,
+			     (src_clk_div - 1) << EMMC_DIV_SHIFT);
+		break;
+	case HCLK_SDMMC:
+	case SCLK_SDMMC:
+		rk_clrsetreg(&cru->cru_clksel_con[11],
+			     MMC0_PLL_MASK | MMC0_DIV_MASK,
+			     mux << MMC0_PLL_SHIFT |
+			     (src_clk_div - 1) << MMC0_DIV_SHIFT);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
+}
+
+static int rk322x_ddr_set_clk(struct rk322x_cru *cru, unsigned int set_rate)
+{
+	struct pll_div dpll_cfg;
+
+	/*  clk_ddrc == DPLL = 24MHz / refdiv * fbdiv / postdiv1 / postdiv2 */
+	switch (set_rate) {
+	case 400*MHz:
+		dpll_cfg = (struct pll_div)
+		{.refdiv = 1, .fbdiv = 50, .postdiv1 = 3, .postdiv2 = 1};
+		break;
+	case 600*MHz:
+		dpll_cfg = (struct pll_div)
+		{.refdiv = 1, .fbdiv = 75, .postdiv1 = 3, .postdiv2 = 1};
+		break;
+	case 800*MHz:
+		dpll_cfg = (struct pll_div)
+		{.refdiv = 1, .fbdiv = 100, .postdiv1 = 3, .postdiv2 = 1};
+		break;
+	}
+
+	/* pll enter slow-mode */
+	rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
+		     DPLL_MODE_SLOW << DPLL_MODE_SHIFT);
+	rkclk_set_pll(cru, CLK_DDR, &dpll_cfg);
+	/* PLL enter normal-mode */
+	rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
+		     DPLL_MODE_NORM << DPLL_MODE_SHIFT);
+
+	return set_rate;
+}
+static ulong rk322x_clk_get_rate(struct clk *clk)
+{
+	struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong rate, gclk_rate;
+
+	gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
+	switch (clk->id) {
+	case 0 ... 63:
+		rate = rkclk_pll_get_rate(priv->cru, clk->id);
+		break;
+	case HCLK_EMMC:
+	case SCLK_EMMC:
+	case HCLK_SDMMC:
+	case SCLK_SDMMC:
+		rate = rockchip_mmc_get_clk(priv->cru, gclk_rate, clk->id);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return rate;
+}
+
+static ulong rk322x_clk_set_rate(struct clk *clk, ulong rate)
+{
+	struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
+	ulong new_rate, gclk_rate;
+
+	gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
+	switch (clk->id) {
+	case HCLK_EMMC:
+	case SCLK_EMMC:
+	case HCLK_SDMMC:
+	case SCLK_SDMMC:
+		new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
+						clk->id, rate);
+		break;
+	case CLK_DDR:
+		new_rate = rk322x_ddr_set_clk(priv->cru, rate);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	return new_rate;
+}
+
+static struct clk_ops rk322x_clk_ops = {
+	.get_rate	= rk322x_clk_get_rate,
+	.set_rate	= rk322x_clk_set_rate,
+};
+
+static int rk322x_clk_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rk322x_clk_priv *priv = dev_get_priv(dev);
+
+	priv->cru = (struct rk322x_cru *)devfdt_get_addr(dev);
+
+	return 0;
+}
+
+static int rk322x_clk_probe(struct udevice *dev)
+{
+	struct rk322x_clk_priv *priv = dev_get_priv(dev);
+
+	rkclk_init(priv->cru);
+
+	return 0;
+}
+
+static int rk322x_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, "rk322x_sysreset", "reset", &dev);
+	if (ret)
+		debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
+
+	return 0;
+}
+
+static const struct udevice_id rk322x_clk_ids[] = {
+	{ .compatible = "rockchip,rk3228-cru" },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_rk322x_cru) = {
+	.name		= "clk_rk322x",
+	.id		= UCLASS_CLK,
+	.of_match	= rk322x_clk_ids,
+	.priv_auto_alloc_size = sizeof(struct rk322x_clk_priv),
+	.ofdata_to_platdata = rk322x_clk_ofdata_to_platdata,
+	.ops		= &rk322x_clk_ops,
+	.bind		= rk322x_clk_bind,
+	.probe		= rk322x_clk_probe,
+};