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The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Acked-by: Dinh Nguyen <dinguyen@kernel.org> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> # samsung Acked-by: Heiko Stuebner <heiko@sntech.de> #rockchip Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # versaclock5 Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230718143156.1066339-1-robh@kernel.org Acked-by: Abel Vesa <abel.vesa@linaro.org> #imx Signed-off-by: Stephen Boyd <sboyd@kernel.org>
634 lines
14 KiB
C
634 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier
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*
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* Copyright (C) 2015 Renesas Electronics Corporation
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/i2c.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#define CH_MAX 4
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#define RATIO_REG_SIZE 4
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#define DEVICE_ID 0x1
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#define DEVICE_CTRL 0x2
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#define DEVICE_CFG1 0x3
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#define DEVICE_CFG2 0x4
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#define GLOBAL_CFG 0x5
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#define Ratio_Add(x, nth) (6 + (x * 4) + (nth))
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#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF)
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#define Val_Ratio(x, nth) ((x & 0xFF) << (24 - (8 * nth)))
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#define FUNC_CFG1 0x16
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#define FUNC_CFG2 0x17
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/* DEVICE_ID */
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#define REVISION_MASK (0x7)
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#define REVISION_B2_B3 (0x4)
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#define REVISION_C1 (0x6)
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/* DEVICE_CTRL */
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#define PLL_UNLOCK (1 << 7)
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#define AUXOUTDIS (1 << 1)
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#define CLKOUTDIS (1 << 0)
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/* DEVICE_CFG1 */
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#define RSEL(x) (((x) & 0x3) << 3)
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#define RSEL_MASK RSEL(0x3)
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#define AUXOUTSRC(x) (((x) & 0x3) << 1)
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#define AUXOUTSRC_MASK AUXOUTSRC(0x3)
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#define ENDEV1 (0x1)
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/* DEVICE_CFG2 */
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#define AUTORMOD (1 << 3)
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#define LOCKCLK(x) (((x) & 0x3) << 1)
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#define LOCKCLK_MASK LOCKCLK(0x3)
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#define FRACNSRC_MASK (1 << 0)
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#define FRACNSRC_STATIC (0 << 0)
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#define FRACNSRC_DYNAMIC (1 << 0)
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/* GLOBAL_CFG */
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#define FREEZE (1 << 7)
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#define ENDEV2 (0x1)
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/* FUNC_CFG1 */
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#define CLKSKIPEN (1 << 7)
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#define REFCLKDIV(x) (((x) & 0x3) << 3)
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#define REFCLKDIV_MASK REFCLKDIV(0x3)
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/* FUNC_CFG2 */
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#define LFRATIO_MASK (1 << 3)
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#define LFRATIO_20_12 (0 << 3)
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#define LFRATIO_12_20 (1 << 3)
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#define CH_SIZE_ERR(ch) ((ch < 0) || (ch >= CH_MAX))
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#define hw_to_priv(_hw) container_of(_hw, struct cs2000_priv, hw)
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#define priv_to_client(priv) (priv->client)
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#define priv_to_dev(priv) (&(priv_to_client(priv)->dev))
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#define CLK_IN 0
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#define REF_CLK 1
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#define CLK_MAX 2
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static bool cs2000_readable_reg(struct device *dev, unsigned int reg)
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{
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return reg > 0;
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}
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static bool cs2000_writeable_reg(struct device *dev, unsigned int reg)
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{
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return reg != DEVICE_ID;
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}
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static bool cs2000_volatile_reg(struct device *dev, unsigned int reg)
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{
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return reg == DEVICE_CTRL;
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}
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static const struct regmap_config cs2000_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = FUNC_CFG2,
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.readable_reg = cs2000_readable_reg,
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.writeable_reg = cs2000_writeable_reg,
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.volatile_reg = cs2000_volatile_reg,
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};
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struct cs2000_priv {
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struct clk_hw hw;
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struct i2c_client *client;
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struct clk *clk_in;
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struct clk *ref_clk;
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struct regmap *regmap;
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bool dynamic_mode;
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bool lf_ratio;
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bool clk_skip;
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/* suspend/resume */
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unsigned long saved_rate;
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unsigned long saved_parent_rate;
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};
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static const struct of_device_id cs2000_of_match[] = {
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{ .compatible = "cirrus,cs2000-cp", },
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{},
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};
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MODULE_DEVICE_TABLE(of, cs2000_of_match);
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static const struct i2c_device_id cs2000_id[] = {
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{ "cs2000-cp", },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, cs2000_id);
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static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable)
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{
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int ret;
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ret = regmap_update_bits(priv->regmap, DEVICE_CFG1, ENDEV1,
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enable ? ENDEV1 : 0);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(priv->regmap, GLOBAL_CFG, ENDEV2,
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enable ? ENDEV2 : 0);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(priv->regmap, FUNC_CFG1, CLKSKIPEN,
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(enable && priv->clk_skip) ? CLKSKIPEN : 0);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int cs2000_ref_clk_bound_rate(struct cs2000_priv *priv,
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u32 rate_in)
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{
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u32 val;
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if (rate_in >= 32000000 && rate_in < 56000000)
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val = 0x0;
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else if (rate_in >= 16000000 && rate_in < 28000000)
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val = 0x1;
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else if (rate_in >= 8000000 && rate_in < 14000000)
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val = 0x2;
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else
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return -EINVAL;
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return regmap_update_bits(priv->regmap, FUNC_CFG1,
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REFCLKDIV_MASK,
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REFCLKDIV(val));
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}
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static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
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{
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struct device *dev = priv_to_dev(priv);
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unsigned int i, val;
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int ret;
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for (i = 0; i < 256; i++) {
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ret = regmap_read(priv->regmap, DEVICE_CTRL, &val);
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if (ret < 0)
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return ret;
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if (!(val & PLL_UNLOCK))
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return 0;
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udelay(1);
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}
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dev_err(dev, "pll lock failed\n");
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return -ETIMEDOUT;
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}
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static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable)
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{
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/* enable both AUX_OUT, CLK_OUT */
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return regmap_update_bits(priv->regmap, DEVICE_CTRL,
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(AUXOUTDIS | CLKOUTDIS),
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enable ? 0 :
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(AUXOUTDIS | CLKOUTDIS));
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}
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static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out, bool lf_ratio)
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{
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u64 ratio;
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u32 multiplier = lf_ratio ? 12 : 20;
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/*
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* ratio = rate_out / rate_in * 2^multiplier
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*
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* To avoid over flow, rate_out is u64.
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* The result should be u32.
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*/
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ratio = (u64)rate_out << multiplier;
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do_div(ratio, rate_in);
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return ratio;
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}
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static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in, bool lf_ratio)
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{
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u64 rate_out;
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u32 multiplier = lf_ratio ? 12 : 20;
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/*
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* ratio = rate_out / rate_in * 2^multiplier
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*
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* To avoid over flow, rate_out is u64.
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* The result should be u32 or unsigned long.
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*/
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rate_out = (u64)ratio * rate_in;
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return rate_out >> multiplier;
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}
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static int cs2000_ratio_set(struct cs2000_priv *priv,
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int ch, u32 rate_in, u32 rate_out)
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{
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u32 val;
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unsigned int i;
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int ret;
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if (CH_SIZE_ERR(ch))
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return -EINVAL;
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val = cs2000_rate_to_ratio(rate_in, rate_out, priv->lf_ratio);
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for (i = 0; i < RATIO_REG_SIZE; i++) {
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ret = regmap_write(priv->regmap,
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Ratio_Add(ch, i),
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Ratio_Val(val, i));
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch)
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{
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unsigned int tmp, i;
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u32 val;
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int ret;
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val = 0;
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for (i = 0; i < RATIO_REG_SIZE; i++) {
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ret = regmap_read(priv->regmap, Ratio_Add(ch, i), &tmp);
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if (ret < 0)
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return 0;
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val |= Val_Ratio(tmp, i);
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}
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return val;
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}
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static int cs2000_ratio_select(struct cs2000_priv *priv, int ch)
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{
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int ret;
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u8 fracnsrc;
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if (CH_SIZE_ERR(ch))
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return -EINVAL;
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ret = regmap_update_bits(priv->regmap, DEVICE_CFG1, RSEL_MASK, RSEL(ch));
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if (ret < 0)
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return ret;
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fracnsrc = priv->dynamic_mode ? FRACNSRC_DYNAMIC : FRACNSRC_STATIC;
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ret = regmap_update_bits(priv->regmap, DEVICE_CFG2,
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AUTORMOD | LOCKCLK_MASK | FRACNSRC_MASK,
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LOCKCLK(ch) | fracnsrc);
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if (ret < 0)
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return ret;
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return 0;
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}
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static unsigned long cs2000_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct cs2000_priv *priv = hw_to_priv(hw);
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int ch = 0; /* it uses ch0 only at this point */
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u32 ratio;
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ratio = cs2000_ratio_get(priv, ch);
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return cs2000_ratio_to_rate(ratio, parent_rate, priv->lf_ratio);
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}
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static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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struct cs2000_priv *priv = hw_to_priv(hw);
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u32 ratio;
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ratio = cs2000_rate_to_ratio(*parent_rate, rate, priv->lf_ratio);
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return cs2000_ratio_to_rate(ratio, *parent_rate, priv->lf_ratio);
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}
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static int cs2000_select_ratio_mode(struct cs2000_priv *priv,
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unsigned long rate,
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unsigned long parent_rate)
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{
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/*
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* From the datasheet:
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*
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* | It is recommended that the 12.20 High-Resolution format be
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* | utilized whenever the desired ratio is less than 4096 since
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* | the output frequency accuracy of the PLL is directly proportional
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* | to the accuracy of the timing reference clock and the resolution
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* | of the R_UD.
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*
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* This mode is only available in dynamic mode.
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*/
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priv->lf_ratio = priv->dynamic_mode && ((rate / parent_rate) > 4096);
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return regmap_update_bits(priv->regmap, FUNC_CFG2, LFRATIO_MASK,
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priv->lf_ratio ? LFRATIO_20_12 : LFRATIO_12_20);
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}
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static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
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unsigned long rate, unsigned long parent_rate)
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{
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int ret;
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ret = regmap_update_bits(priv->regmap, GLOBAL_CFG, FREEZE, FREEZE);
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if (ret < 0)
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return ret;
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ret = cs2000_select_ratio_mode(priv, rate, parent_rate);
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if (ret < 0)
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return ret;
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ret = cs2000_ratio_set(priv, ch, parent_rate, rate);
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if (ret < 0)
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return ret;
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ret = cs2000_ratio_select(priv, ch);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(priv->regmap, GLOBAL_CFG, FREEZE, 0);
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if (ret < 0)
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return ret;
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priv->saved_rate = rate;
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priv->saved_parent_rate = parent_rate;
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return 0;
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}
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static int cs2000_set_rate(struct clk_hw *hw,
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unsigned long rate, unsigned long parent_rate)
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{
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struct cs2000_priv *priv = hw_to_priv(hw);
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int ch = 0; /* it uses ch0 only at this point */
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return __cs2000_set_rate(priv, ch, rate, parent_rate);
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}
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static int cs2000_set_saved_rate(struct cs2000_priv *priv)
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{
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int ch = 0; /* it uses ch0 only at this point */
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return __cs2000_set_rate(priv, ch,
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priv->saved_rate,
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priv->saved_parent_rate);
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}
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static int cs2000_enable(struct clk_hw *hw)
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{
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struct cs2000_priv *priv = hw_to_priv(hw);
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int ret;
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ret = cs2000_enable_dev_config(priv, true);
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if (ret < 0)
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return ret;
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ret = cs2000_clk_out_enable(priv, true);
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if (ret < 0)
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return ret;
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ret = cs2000_wait_pll_lock(priv);
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if (ret < 0)
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return ret;
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return ret;
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}
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static void cs2000_disable(struct clk_hw *hw)
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{
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struct cs2000_priv *priv = hw_to_priv(hw);
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cs2000_enable_dev_config(priv, false);
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cs2000_clk_out_enable(priv, false);
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}
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static u8 cs2000_get_parent(struct clk_hw *hw)
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{
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struct cs2000_priv *priv = hw_to_priv(hw);
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/*
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* In dynamic mode, output rates are derived from CLK_IN.
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* In static mode, CLK_IN is ignored, so we return REF_CLK instead.
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*/
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return priv->dynamic_mode ? CLK_IN : REF_CLK;
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}
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static const struct clk_ops cs2000_ops = {
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.get_parent = cs2000_get_parent,
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.recalc_rate = cs2000_recalc_rate,
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.round_rate = cs2000_round_rate,
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.set_rate = cs2000_set_rate,
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.prepare = cs2000_enable,
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.unprepare = cs2000_disable,
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};
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static int cs2000_clk_get(struct cs2000_priv *priv)
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{
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struct device *dev = priv_to_dev(priv);
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struct clk *clk_in, *ref_clk;
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clk_in = devm_clk_get(dev, "clk_in");
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/* not yet provided */
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if (IS_ERR(clk_in))
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return -EPROBE_DEFER;
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ref_clk = devm_clk_get(dev, "ref_clk");
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/* not yet provided */
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if (IS_ERR(ref_clk))
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return -EPROBE_DEFER;
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priv->clk_in = clk_in;
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priv->ref_clk = ref_clk;
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return 0;
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}
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static int cs2000_clk_register(struct cs2000_priv *priv)
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{
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struct device *dev = priv_to_dev(priv);
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struct device_node *np = dev->of_node;
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struct clk_init_data init;
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const char *name = np->name;
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static const char *parent_names[CLK_MAX];
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u32 aux_out = 0;
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int ref_clk_rate;
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int ch = 0; /* it uses ch0 only at this point */
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int ret;
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of_property_read_string(np, "clock-output-names", &name);
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priv->dynamic_mode = of_property_read_bool(np, "cirrus,dynamic-mode");
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dev_info(dev, "operating in %s mode\n",
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priv->dynamic_mode ? "dynamic" : "static");
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of_property_read_u32(np, "cirrus,aux-output-source", &aux_out);
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ret = regmap_update_bits(priv->regmap, DEVICE_CFG1,
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AUXOUTSRC_MASK, AUXOUTSRC(aux_out));
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if (ret < 0)
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return ret;
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priv->clk_skip = of_property_read_bool(np, "cirrus,clock-skip");
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ref_clk_rate = clk_get_rate(priv->ref_clk);
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ret = cs2000_ref_clk_bound_rate(priv, ref_clk_rate);
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if (ret < 0)
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return ret;
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if (priv->dynamic_mode) {
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/* Default to low-frequency mode to allow for large ratios */
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priv->lf_ratio = true;
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} else {
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/*
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* set default rate as 1/1.
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* otherwise .set_rate which setup ratio
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* is never called if user requests 1/1 rate
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*/
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ret = __cs2000_set_rate(priv, ch, ref_clk_rate, ref_clk_rate);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
parent_names[CLK_IN] = __clk_get_name(priv->clk_in);
|
|
parent_names[REF_CLK] = __clk_get_name(priv->ref_clk);
|
|
|
|
init.name = name;
|
|
init.ops = &cs2000_ops;
|
|
init.flags = CLK_SET_RATE_GATE;
|
|
init.parent_names = parent_names;
|
|
init.num_parents = ARRAY_SIZE(parent_names);
|
|
|
|
priv->hw.init = &init;
|
|
|
|
ret = clk_hw_register(dev, &priv->hw);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &priv->hw);
|
|
if (ret < 0) {
|
|
clk_hw_unregister(&priv->hw);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cs2000_version_print(struct cs2000_priv *priv)
|
|
{
|
|
struct device *dev = priv_to_dev(priv);
|
|
const char *revision;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(priv->regmap, DEVICE_ID, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* CS2000 should be 0x0 */
|
|
if (val >> 3)
|
|
return -EIO;
|
|
|
|
switch (val & REVISION_MASK) {
|
|
case REVISION_B2_B3:
|
|
revision = "B2 / B3";
|
|
break;
|
|
case REVISION_C1:
|
|
revision = "C1";
|
|
break;
|
|
default:
|
|
return -EIO;
|
|
}
|
|
|
|
dev_info(dev, "revision - %s\n", revision);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cs2000_remove(struct i2c_client *client)
|
|
{
|
|
struct cs2000_priv *priv = i2c_get_clientdata(client);
|
|
struct device *dev = priv_to_dev(priv);
|
|
struct device_node *np = dev->of_node;
|
|
|
|
of_clk_del_provider(np);
|
|
|
|
clk_hw_unregister(&priv->hw);
|
|
}
|
|
|
|
static int cs2000_probe(struct i2c_client *client)
|
|
{
|
|
struct cs2000_priv *priv;
|
|
struct device *dev = &client->dev;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->client = client;
|
|
i2c_set_clientdata(client, priv);
|
|
|
|
priv->regmap = devm_regmap_init_i2c(client, &cs2000_regmap_config);
|
|
if (IS_ERR(priv->regmap))
|
|
return PTR_ERR(priv->regmap);
|
|
|
|
ret = cs2000_clk_get(priv);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = cs2000_clk_register(priv);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = cs2000_version_print(priv);
|
|
if (ret < 0)
|
|
goto probe_err;
|
|
|
|
return 0;
|
|
|
|
probe_err:
|
|
cs2000_remove(client);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __maybe_unused cs2000_resume(struct device *dev)
|
|
{
|
|
struct cs2000_priv *priv = dev_get_drvdata(dev);
|
|
|
|
return cs2000_set_saved_rate(priv);
|
|
}
|
|
|
|
static const struct dev_pm_ops cs2000_pm_ops = {
|
|
SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, cs2000_resume)
|
|
};
|
|
|
|
static struct i2c_driver cs2000_driver = {
|
|
.driver = {
|
|
.name = "cs2000-cp",
|
|
.pm = &cs2000_pm_ops,
|
|
.of_match_table = cs2000_of_match,
|
|
},
|
|
.probe = cs2000_probe,
|
|
.remove = cs2000_remove,
|
|
.id_table = cs2000_id,
|
|
};
|
|
|
|
module_i2c_driver(cs2000_driver);
|
|
|
|
MODULE_DESCRIPTION("CS2000-CP driver");
|
|
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
|
|
MODULE_LICENSE("GPL v2");
|