diff options
Diffstat (limited to 'drivers/clk/clk-xlnx-clock-wizard.c')
| -rw-r--r-- | drivers/clk/clk-xlnx-clock-wizard.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/clk/clk-xlnx-clock-wizard.c b/drivers/clk/clk-xlnx-clock-wizard.c new file mode 100644 index 00000000000..70ee3af1074 --- /dev/null +++ b/drivers/clk/clk-xlnx-clock-wizard.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Xilinx 'Clocking Wizard' driver + * + * Copyright (c) 2021 Macronix Inc. + * + * Author: Zhengxun Li <zhengxunli@mxic.com.tw> + */ + +#include <common.h> +#include <clk-uclass.h> +#include <dm.h> +#include <div64.h> +#include <dm/device_compat.h> +#include <linux/iopoll.h> + +#include <linux/bitfield.h> + +#define SRR 0x0 + +#define SR 0x4 +#define SR_LOCKED BIT(0) + +#define CCR(x) (0x200 + ((x) * 4)) + +#define FBOUT_CFG CCR(0) +#define FBOUT_DIV(x) (x) +#define FBOUT_DIV_MASK GENMASK(7, 0) +#define FBOUT_GET_DIV(x) FIELD_GET(FBOUT_DIV_MASK, x) +#define FBOUT_MUL(x) ((x) << 8) +#define FBOUT_MUL_MASK GENMASK(15, 8) +#define FBOUT_GET_MUL(x) FIELD_GET(FBOUT_MUL_MASK, x) +#define FBOUT_FRAC(x) ((x) << 16) +#define FBOUT_FRAC_MASK GENMASK(25, 16) +#define FBOUT_GET_FRAC(x) FIELD_GET(FBOUT_FRAC_MASK, x) +#define FBOUT_FRAC_EN BIT(26) + +#define FBOUT_PHASE CCR(1) + +#define OUT_CFG(x) CCR(2 + ((x) * 3)) +#define OUT_DIV(x) (x) +#define OUT_DIV_MASK GENMASK(7, 0) +#define OUT_GET_DIV(x) FIELD_GET(OUT_DIV_MASK, x) +#define OUT_FRAC(x) ((x) << 8) +#define OUT_GET_MASK GENMASK(17, 8) +#define OUT_GET_FRAC(x) FIELD_GET(OUT_GET_MASK, x) +#define OUT_FRAC_EN BIT(18) + +#define OUT_PHASE(x) CCR(3 + ((x) * 3)) +#define OUT_DUTY(x) CCR(4 + ((x) * 3)) + +#define CTRL CCR(23) +#define CTRL_SEN BIT(2) +#define CTRL_SADDR BIT(1) +#define CTRL_LOAD BIT(0) + +/** + * struct clkwzrd - Clock wizard private data structure + * + * @base: memory base + * @vco_clk: voltage-controlled oscillator frequency + * + */ +struct clkwzd { + void *base; + u64 vco_clk; +}; + +struct clkwzd_plat { + fdt_addr_t addr; +}; + +static int clk_wzrd_enable(struct clk *clk) +{ + struct clkwzd *priv = dev_get_priv(clk->dev); + int ret; + u32 val; + + ret = readl_poll_sleep_timeout(priv->base + SR, val, val & SR_LOCKED, + 1, 100); + if (!ret) { + writel(CTRL_SEN | CTRL_SADDR | CTRL_LOAD, priv->base + CTRL); + writel(CTRL_SADDR, priv->base + CTRL); + ret = readl_poll_sleep_timeout(priv->base + SR, val, + val & SR_LOCKED, 1, 100); + } + + return ret; +} + +static unsigned long clk_wzrd_set_rate(struct clk *clk, ulong rate) +{ + struct clkwzd *priv = dev_get_priv(clk->dev); + u64 div; + u32 cfg; + + /* Get output clock divide value */ + div = DIV_ROUND_DOWN_ULL(priv->vco_clk * 1000, rate); + if (div < 1000 || div > 255999) + return -EINVAL; + + cfg = OUT_DIV((u32)div / 1000); + + writel(cfg, priv->base + OUT_CFG(clk->id)); + + return 0; +} + +static struct clk_ops clk_wzrd_ops = { + .enable = clk_wzrd_enable, + .set_rate = clk_wzrd_set_rate, +}; + +static int clk_wzrd_probe(struct udevice *dev) +{ + struct clkwzd_plat *plat = dev_get_plat(dev); + struct clkwzd *priv = dev_get_priv(dev); + struct clk clk_in1; + u64 clock, vco_clk; + u32 cfg; + int ret; + + priv->base = (void *)plat->addr; + + ret = clk_get_by_name(dev, "clk_in1", &clk_in1); + if (ret < 0) { + dev_err(dev, "failed to get clock\n"); + return ret; + } + + clock = clk_get_rate(&clk_in1); + if (IS_ERR_VALUE(clock)) { + dev_err(dev, "failed to get rate\n"); + return clock; + } + + ret = clk_enable(&clk_in1); + if (ret) { + dev_err(dev, "failed to enable clock\n"); + clk_free(&clk_in1); + return ret; + } + + /* Read clock configuration registers */ + cfg = readl(priv->base + FBOUT_CFG); + + /* Recalculate VCO rate */ + if (cfg & FBOUT_FRAC_EN) + vco_clk = DIV_ROUND_DOWN_ULL(clock * + ((FBOUT_GET_MUL(cfg) * 1000) + + FBOUT_GET_FRAC(cfg)), + 1000); + else + vco_clk = clock * FBOUT_GET_MUL(cfg); + + priv->vco_clk = DIV_ROUND_DOWN_ULL(vco_clk, FBOUT_GET_DIV(cfg)); + + return 0; +} + +static int clk_wzrd_of_to_plat(struct udevice *dev) +{ + struct clkwzd_plat *plat = dev_get_plat(dev); + + plat->addr = dev_read_addr(dev); + if (plat->addr == FDT_ADDR_T_NONE) + return -EINVAL; + + return 0; +} + +static const struct udevice_id clk_wzrd_ids[] = { + { .compatible = "xlnx,clocking-wizard" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(clk_wzrd) = { + .name = "zynq-clk-wizard", + .id = UCLASS_CLK, + .of_match = clk_wzrd_ids, + .ops = &clk_wzrd_ops, + .probe = clk_wzrd_probe, + .of_to_plat = clk_wzrd_of_to_plat, + .priv_auto = sizeof(struct clkwzd), + .plat_auto = sizeof(struct clkwzd_plat), +}; |