rockchip: rk3036: Add clock driver
Add a driver for setting up and modifying the various PLLs, peripheral
clocks and mmc clocks on RK3036
Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 008ec10..4a6a4a8 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -6,5 +6,6 @@
#
obj-$(CONFIG_CLK) += clk-uclass.o
+obj-$(CONFIG_ROCKCHIP_RK3036) += clk_rk3036.o
obj-$(CONFIG_ROCKCHIP_RK3288) += clk_rk3288.o
obj-$(CONFIG_SANDBOX) += clk_sandbox.o
diff --git a/drivers/clk/clk_rk3036.c b/drivers/clk/clk_rk3036.c
new file mode 100644
index 0000000..6c802b6
--- /dev/null
+++ b/drivers/clk/clk_rk3036.c
@@ -0,0 +1,414 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <errno.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3036.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/periph.h>
+#include <dm/lists.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct rk3036_clk_plat {
+ enum rk_clk_id clk_id;
+};
+
+struct rk3036_clk_priv {
+ struct rk3036_cru *cru;
+ ulong rate;
+};
+
+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 unsigned int log2(unsigned int value)
+{
+ return fls(value) - 1;
+}
+
+static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
+ const struct pll_div *div)
+{
+ int pll_id = rk_pll_id(clk_id);
+ struct rk3036_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: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%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 interger mode */
+ rk_clrreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
+
+ rk_clrsetreg(&pll->con0,
+ PLL_POSTDIV1_MASK << PLL_POSTDIV1_SHIFT | PLL_FBDIV_MASK,
+ (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
+ rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK << PLL_POSTDIV2_SHIFT |
+ PLL_REFDIV_MASK << PLL_REFDIV_SHIFT,
+ (div->postdiv2 << PLL_POSTDIV2_SHIFT |
+ div->refdiv << PLL_REFDIV_SHIFT));
+
+ /* waiting for pll lock */
+ while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
+ udelay(1);
+
+ return 0;
+}
+
+static void rkclk_init(struct rk3036_cru *cru)
+{
+ u32 aclk_div;
+ u32 hclk_div;
+ u32 pclk_div;
+
+ /* pll enter slow-mode */
+ rk_clrsetreg(&cru->cru_mode_con,
+ GPLL_MODE_MASK << GPLL_MODE_SHIFT |
+ APLL_MODE_MASK << APLL_MODE_SHIFT,
+ 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 core clock pll source and
+ * set up dependent divisors for PCLK/HCLK 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_CLK_PLL_SEL_SHIFT |
+ CORE_DIV_CON_MASK << CORE_DIV_CON_SHIFT,
+ 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_ACLK_DIV_SHIFT |
+ CORE_PERI_DIV_MASK << CORE_PERI_DIV_SHIFT,
+ aclk_div << CORE_ACLK_DIV_SHIFT |
+ pclk_div << CORE_PERI_DIV_SHIFT);
+
+ /*
+ * select apll as cpu clock pll source and
+ * set up dependent divisors for PCLK/HCLK and ACLK clocks.
+ */
+ aclk_div = APLL_HZ / CPU_ACLK_HZ - 1;
+ assert((aclk_div + 1) * CPU_ACLK_HZ == APLL_HZ && aclk_div < 0x1f);
+
+ pclk_div = APLL_HZ / CPU_PCLK_HZ - 1;
+ assert((pclk_div + 1) * CPU_PCLK_HZ == APLL_HZ && pclk_div < 0x7);
+
+ hclk_div = APLL_HZ / CPU_HCLK_HZ - 1;
+ assert((hclk_div + 1) * CPU_HCLK_HZ == APLL_HZ && hclk_div < 0x3);
+
+ rk_clrsetreg(&cru->cru_clksel_con[0],
+ CPU_CLK_PLL_SEL_MASK << CPU_CLK_PLL_SEL_SHIFT |
+ ACLK_CPU_DIV_MASK << ACLK_CPU_DIV_SHIFT,
+ CPU_CLK_PLL_SEL_APLL << CPU_CLK_PLL_SEL_SHIFT |
+ aclk_div << ACLK_CPU_DIV_SHIFT);
+
+ rk_clrsetreg(&cru->cru_clksel_con[1],
+ CPU_PCLK_DIV_MASK << CPU_PCLK_DIV_SHIFT |
+ CPU_HCLK_DIV_MASK << CPU_HCLK_DIV_SHIFT,
+ pclk_div << CPU_PCLK_DIV_SHIFT |
+ hclk_div << CPU_HCLK_DIV_SHIFT);
+
+ /*
+ * select gpll as peri clock pll 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 = log2(PERI_ACLK_HZ / PERI_HCLK_HZ);
+ assert((1 << hclk_div) * PERI_HCLK_HZ ==
+ PERI_ACLK_HZ && (pclk_div < 0x4));
+
+ pclk_div = log2(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_PLL_SEL_SHIFT |
+ PERI_PCLK_DIV_MASK << PERI_PCLK_DIV_SHIFT |
+ PERI_HCLK_DIV_MASK << PERI_HCLK_DIV_SHIFT |
+ PERI_ACLK_DIV_MASK << PERI_ACLK_DIV_SHIFT,
+ 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 << GPLL_MODE_SHIFT |
+ APLL_MODE_MASK << APLL_MODE_SHIFT,
+ 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 rk3036_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 rk3036_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 u8 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 >> shift) & mask) {
+ case GPLL_MODE_SLOW:
+ return OSC_HZ;
+ case GPLL_MODE_NORM:
+
+ /* normal mode */
+ con = readl(&pll->con0);
+ postdiv1 = (con >> PLL_POSTDIV1_SHIFT) & PLL_POSTDIV1_MASK;
+ fbdiv = (con >> PLL_FBDIV_SHIFT) & PLL_FBDIV_MASK;
+ con = readl(&pll->con1);
+ postdiv2 = (con >> PLL_POSTDIV2_SHIFT) & PLL_POSTDIV2_MASK;
+ refdiv = (con >> PLL_REFDIV_SHIFT) & PLL_REFDIV_MASK;
+ return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
+ case GPLL_MODE_DEEP:
+ default:
+ return 32768;
+ }
+}
+
+static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
+ enum periph_id periph)
+{
+ uint src_rate;
+ uint div, mux;
+ u32 con;
+
+ switch (periph) {
+ case PERIPH_ID_EMMC:
+ con = readl(&cru->cru_clksel_con[12]);
+ mux = (con >> EMMC_PLL_SHIFT) & EMMC_PLL_MASK;
+ div = (con >> EMMC_DIV_SHIFT) & EMMC_DIV_MASK;
+ break;
+ case PERIPH_ID_SDCARD:
+ con = readl(&cru->cru_clksel_con[12]);
+ mux = (con >> MMC0_PLL_SHIFT) & MMC0_PLL_MASK;
+ div = (con >> MMC0_DIV_SHIFT) & MMC0_DIV_MASK;
+ 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 rk3036_cru *cru, uint clk_general_rate,
+ enum periph_id 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 PERIPH_ID_EMMC:
+ rk_clrsetreg(&cru->cru_clksel_con[12],
+ EMMC_PLL_MASK << EMMC_PLL_SHIFT |
+ EMMC_DIV_MASK << EMMC_DIV_SHIFT,
+ mux << EMMC_PLL_SHIFT |
+ (src_clk_div - 1) << EMMC_DIV_SHIFT);
+ break;
+ case PERIPH_ID_SDCARD:
+ rk_clrsetreg(&cru->cru_clksel_con[11],
+ MMC0_PLL_MASK << MMC0_PLL_SHIFT |
+ MMC0_DIV_MASK << MMC0_DIV_SHIFT,
+ 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 ulong rk3036_clk_get_rate(struct udevice *dev)
+{
+ struct rk3036_clk_plat *plat = dev_get_platdata(dev);
+ struct rk3036_clk_priv *priv = dev_get_priv(dev);
+
+ debug("%s\n", dev->name);
+ return rkclk_pll_get_rate(priv->cru, plat->clk_id);
+}
+
+static ulong rk3036_clk_set_rate(struct udevice *dev, ulong rate)
+{
+ debug("%s\n", dev->name);
+
+ return 0;
+}
+
+ulong rk3036_set_periph_rate(struct udevice *dev, int periph, ulong rate)
+{
+ struct rk3036_clk_priv *priv = dev_get_priv(dev);
+ ulong new_rate;
+
+ switch (periph) {
+ case PERIPH_ID_EMMC:
+ new_rate = rockchip_mmc_set_clk(priv->cru, clk_get_rate(dev),
+ periph, rate);
+ break;
+ default:
+ return -ENOENT;
+ }
+
+ return new_rate;
+}
+
+static struct clk_ops rk3036_clk_ops = {
+ .get_rate = rk3036_clk_get_rate,
+ .set_rate = rk3036_clk_set_rate,
+ .set_periph_rate = rk3036_set_periph_rate,
+};
+
+static int rk3036_clk_probe(struct udevice *dev)
+{
+ struct rk3036_clk_plat *plat = dev_get_platdata(dev);
+ struct rk3036_clk_priv *priv = dev_get_priv(dev);
+
+ if (plat->clk_id != CLK_OSC) {
+ struct rk3036_clk_priv *parent_priv = dev_get_priv(dev->parent);
+
+ priv->cru = parent_priv->cru;
+ return 0;
+ }
+ priv->cru = (struct rk3036_cru *)dev_get_addr(dev);
+ rkclk_init(priv->cru);
+
+ return 0;
+}
+
+static const char *const clk_name[] = {
+ "osc",
+ "apll",
+ "dpll",
+ "cpll",
+ "gpll",
+ "mpll",
+};
+
+static int rk3036_clk_bind(struct udevice *dev)
+{
+ struct rk3036_clk_plat *plat = dev_get_platdata(dev);
+ int pll, ret;
+
+ /* We only need to set up the root clock */
+ if (dev->of_offset == -1) {
+ plat->clk_id = CLK_OSC;
+ return 0;
+ }
+
+ /* Create devices for P main clocks */
+ for (pll = 1; pll < CLK_COUNT; pll++) {
+ struct udevice *child;
+ struct rk3036_clk_plat *cplat;
+
+ debug("%s %s\n", __func__, clk_name[pll]);
+ ret = device_bind_driver(dev, "clk_rk3036", clk_name[pll],
+ &child);
+ if (ret)
+ return ret;
+
+ cplat = dev_get_platdata(child);
+ cplat->clk_id = pll;
+ }
+
+ /* The reset driver does not have a device node, so bind it here */
+ ret = device_bind_driver(gd->dm_root, "rk3036_reset", "reset", &dev);
+ if (ret)
+ debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
+
+ return 0;
+}
+
+static const struct udevice_id rk3036_clk_ids[] = {
+ { .compatible = "rockchip,rk3036-cru" },
+ { }
+};
+
+U_BOOT_DRIVER(clk_rk3036) = {
+ .name = "clk_rk3036",
+ .id = UCLASS_CLK,
+ .of_match = rk3036_clk_ids,
+ .priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
+ .platdata_auto_alloc_size = sizeof(struct rk3036_clk_plat),
+ .ops = &rk3036_clk_ops,
+ .bind = rk3036_clk_bind,
+ .probe = rk3036_clk_probe,
+};