From patchwork Mon Sep 14 09:47:35 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuninori Morimoto X-Patchwork-Id: 7174331 Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6DDBDBEEC1 for ; Mon, 14 Sep 2015 09:47:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1DD8E2056E for ; Mon, 14 Sep 2015 09:47:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9608120558 for ; Mon, 14 Sep 2015 09:47:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755123AbbINJro (ORCPT ); Mon, 14 Sep 2015 05:47:44 -0400 Received: from relmlor3.renesas.com ([210.160.252.173]:57310 "EHLO relmlie2.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752928AbbINJrl (ORCPT ); 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14 Sep 2015 18:47:38 +0900 Received: from HK2PR06MB0593.apcprd06.prod.outlook.com (10.161.187.144) by HK2PR06MB1074.apcprd06.prod.outlook.com (10.165.60.148) with Microsoft SMTP Server (TLS) id 15.1.268.17; Mon, 14 Sep 2015 09:47:37 +0000 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=kuninori.morimoto.gx@renesas.com; Received: from morimoto-PC.renesas.com (211.11.155.144) by HK2PR06MB0593.apcprd06.prod.outlook.com (10.161.187.144) with Microsoft SMTP Server (TLS) id 15.1.268.17; Mon, 14 Sep 2015 09:47:35 +0000 Message-ID: <87egi1jpz9.wl%kuninori.morimoto.gx@renesas.com> From: Kuninori Morimoto To: Stephen Boyd , Simon , "Michael Turquette" CC: Magnus , Linux-SH , Linux-Kernel , Geert Uytterhoeven , Subject: [PATCH v2] clk: add CS2000 Fractional-N driver User-Agent: Wanderlust/2.15.9 Emacs/24.3 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Date: Mon, 14 Sep 2015 09:47:35 +0000 X-Originating-IP: [211.11.155.144] X-ClientProxiedBy: TY1PR01CA0013.jpnprd01.prod.outlook.com (25.161.131.151) To HK2PR06MB0593.apcprd06.prod.outlook.com (25.161.187.144) X-Microsoft-Exchange-Diagnostics: 1; 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It is useful if it supports runtime clock setting, but it supports fixed clock rate only at this point. Signed-off-by: Kuninori Morimoto --- v1 -> v2 - adds "clock-names" in DT - it uses "clk_in", "ref_clk" (same as datasheet) - cs2000_write(), cs2000_read() checks error - int i -> unsigned int i - used do_div() for 64-by-32 - char *revision -> > const char *revision - CH_ERR() -> CH_SIZE_ERR() .../devicetree/bindings/clock/cs2000-cp.txt | 22 ++ drivers/clk/Kconfig | 6 + drivers/clk/Makefile | 1 + drivers/clk/clk-cs2000-cp.c | 385 +++++++++++++++++++++ 4 files changed, 414 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/cs2000-cp.txt create mode 100644 drivers/clk/clk-cs2000-cp.c diff --git a/Documentation/devicetree/bindings/clock/cs2000-cp.txt b/Documentation/devicetree/bindings/clock/cs2000-cp.txt new file mode 100644 index 0000000..a4479f0 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/cs2000-cp.txt @@ -0,0 +1,22 @@ +CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier + +Required properties: + +- compatible: "cirrus,cs2000-cp" +- reg: The chip select number on the I2C bus +- clocks: common clock binding for CLK_IN, XTI/REF_CLK +- clock-names: CLK_IN : clk_in, XTI/REF_CLK : ref_clk +- clock-frequency: clock frequency of CLK_OUT + +Example: + +&i2c2 { + ... + cs2000: clk_multiplier@0x4f { + compatible = "cirrus,cs2000-cp"; + reg = <0x4f>; + clocks = <&rcar_sound 0>, <&x12_clk>; + clock-names = "clk_in", "ref_clk"; + clock-frequency = <24576000>; /* 1/1 divide */ + }; +}; diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 42f7120..5933e5f 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -95,6 +95,12 @@ config COMMON_CLK_CDCE925 Given a target output frequency, the driver will set the PLL and divider to best approximate the desired output. +config COMMON_CLK_CS2000_CP + tristate "Clock driver for CS2000 Fractional-N Clock Synthesizer & Clock Multiplier" + depends on I2C + help + If you say yes here you get support for the CS2000 clock multiplier + config COMMON_CLK_S2MPS11 tristate "Clock driver for S2MPS1X/S5M8767 MFD" depends on MFD_SEC_CORE diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 9d31e2c..2fb77a8 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o obj-$(CONFIG_COMMON_CLK_CDCE706) += clk-cdce706.o +obj-$(CONFIG_COMMON_CLK_CS2000_CP) += clk-cs2000-cp.o obj-$(CONFIG_ARCH_CLPS711X) += clk-clps711x.o obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c new file mode 100644 index 0000000..f6f2674 --- /dev/null +++ b/drivers/clk/clk-cs2000-cp.c @@ -0,0 +1,385 @@ +/* + * CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier + * + * Copyright (C) 2015 Renesas Electronics Corporation + * Kuninori Morimoto + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include + +#define CH_MAX 4 + +#define DEVICE_ID 0x1 +#define DEVICE_CTRL 0x2 +#define DEVICE_CFG1 0x3 +#define DEVICE_CFG2 0x4 +#define GLOBAL_CFG 0x5 +#define Ratio_Add(x, nth) (6 + (x * 4) + (nth)) +#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF) +#define FUNC_CFG1 0x16 +#define FUNC_CFG2 0x17 + +/* DEVICE_CTRL */ +#define PLL_UNLOCK (1 << 7) + +/* DEVICE_CFG1 */ +#define RSEL(x) (((x) & 0x3) << 3) +#define RSEL_MASK RSEL(0x3) +#define ENDEV1 (0x1) + +/* GLOBAL_CFG */ +#define ENDEV2 (0x1) + +#define CH_SIZE_ERR(ch) ((ch < 0) || (ch >= CH_MAX)) + +struct cs2000_priv { + struct clk *clk_in; + struct clk *ref_clk; + struct clk *clk_out; +}; + +static const struct of_device_id cs2000_of_match[] = { + { .compatible = "cirrus,cs2000-cp", }, + {}, +}; +MODULE_DEVICE_TABLE(of, cs2000_of_match); + +static const struct i2c_device_id cs2000_id[] = { + { "cs2000-cp", }, + {} +}; +MODULE_DEVICE_TABLE(i2c, cs2000_id); + +#define cs2000_read(c, addr) i2c_smbus_read_byte_data(c, addr) +static int cs2000_write(struct i2c_client *client, u8 addr, u8 val) +{ + struct device *dev = &client->dev; + + dev_dbg(dev, "0x%02x : 0x%02x\n", addr, val); + + return i2c_smbus_write_byte_data(client, addr, val); +} + +static int cs2000_bset(struct i2c_client *client, u8 addr, u8 mask, u8 val) +{ + s32 data; + + data = cs2000_read(client, addr); + if (data < 0) + return data; + + data &= ~mask; + data |= (val & mask); + + return cs2000_write(client, addr, data); +} + +static int cs2000_ratio_set(struct i2c_client *client, + int ch, u32 rate_in, u32 rate_out) +{ + u64 val; + unsigned int i; + int ret; + + if (CH_SIZE_ERR(ch)) + return -EINVAL; + + /* + * ratio = rate_out / rate_in * 2^20 + * + * To avoid over flow, rate_out is u64 + * The result should be u32 + */ + + val = rate_out; + val *= (1 << 20); + do_div(val, rate_in); + for (i = 0; i < 4; i++) { + ret = cs2000_write(client, + Ratio_Add(ch, i), + Ratio_Val(val, i)); + if (ret < 0) + return ret; + } + + return 0; +} + +static int cs2000_ratio_select(struct i2c_client *client, int ch) +{ + int ret; + + if (CH_SIZE_ERR(ch)) + return -EINVAL; + + /* + * FIXME + * + * this driver supports static ratio mode only + * at this point + */ + ret = cs2000_bset(client, DEVICE_CFG1, RSEL_MASK, RSEL(ch)); + if (ret < 0) + return ret; + + ret = cs2000_write(client, DEVICE_CFG2, 0x0); + if (ret < 0) + return ret; + + return 0; +} + +static int cs2000_enable_dev_config(struct i2c_client *client) +{ + int ret; + + ret = cs2000_bset(client, DEVICE_CFG1, ENDEV1, ENDEV1); + if (ret < 0) + return ret; + + ret = cs2000_bset(client, GLOBAL_CFG, ENDEV2, ENDEV2); + if (ret < 0) + return ret; + + return 0; +} + +static int cs2000_clk_get(struct i2c_client *client, + u32 *rate_in, u32 *rate_out) +{ + struct cs2000_priv *priv = i2c_get_clientdata(client); + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + struct clk *clk_in, *ref_clk; + + clk_in = devm_clk_get(dev, "clk_in"); + /* not yet provided */ + if (IS_ERR(clk_in)) + return -EPROBE_DEFER; + + ref_clk = devm_clk_get(dev, "ref_clk"); + if (IS_ERR(ref_clk)) + return PTR_ERR(ref_clk); + + *rate_in = clk_get_rate(ref_clk); + + if (of_property_read_u32(np, "clock-frequency", rate_out)) + return -EINVAL; + + dev_dbg(dev, "%d -> %d\n", + *rate_in, *rate_out); + + priv->clk_in = clk_in; + priv->ref_clk = ref_clk; + + return 0; +} + +static int cs2000_clk_in_bound_rate(struct i2c_client *client, + u32 rate_in) +{ + u32 val; + + if ((32000000 <= rate_in) && + (56000000 > rate_in)) + val = 0x0; + else if ((16000000 <= rate_in) && + (28000000 > rate_in)) + val = 0x1; + else if ((8000000 <= rate_in) && + (14000000 > rate_in)) + val = 0x2; + else + return -EINVAL; + + return cs2000_bset(client, FUNC_CFG1, 0x3 << 3, val << 3); +} + +static int cs2000_wait_pll_lock(struct i2c_client *client) +{ + struct device *dev = &client->dev; + s32 val; + unsigned int i; + + for (i = 0; i < 256; i++) { + val = cs2000_read(client, DEVICE_CTRL); + if (val < 0) + return val; + if (!(val & PLL_UNLOCK)) + return 0; + udelay(1); + } + + dev_err(dev, "pll lock failed\n"); + + return -EIO; +} + +static int cs2000_clk_out_enable(struct i2c_client *client) +{ + /* enable both AUX_OUT, CLK_OUT */ + return cs2000_write(client, DEVICE_CTRL, 0x0); +} + +static int cs2000_clk_register(struct i2c_client *client) +{ + struct cs2000_priv *priv = i2c_get_clientdata(client); + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + struct clk *clk; + const char *parent_clk_name = __clk_get_name(priv->ref_clk); + u32 rate; + + if (of_property_read_u32(np, "clock-frequency", &rate)) + return -EINVAL; + + /* + * FIXME + * + * register this driver as fixed rate clock + * at this point + */ + clk = clk_register_fixed_rate(dev, "clk_out", parent_clk_name, + (parent_clk_name) ? 0 : CLK_IS_ROOT, + rate); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + priv->clk_out = clk; + of_clk_add_provider(np, of_clk_src_simple_get, clk); + + return 0; +} + +static void cs2000_clk_unregister(struct i2c_client *client) +{ + struct cs2000_priv *priv = i2c_get_clientdata(client); + struct device *dev = &client->dev; + struct device_node *np = dev->of_node; + + of_clk_del_provider(np); + clk_put(priv->clk_out); + + priv->clk_out = NULL; +} + +static int cs2000_version_print(struct i2c_client *client) +{ + struct device *dev = &client->dev; + s32 val = cs2000_read(client, DEVICE_ID); + const char *revision; + + if (val < 0) + return val; + + /* CS2000 should be 0x0 */ + if (0 != (val >> 3)) + return -EIO; + + switch (val & 0x7) { + case 0x4: + revision = "B2 / B3"; + break; + case 0x6: + revision = "C1"; + break; + default: + return -EIO; + } + + dev_info(dev, "revision - %s\n", revision); + + return 0; +} + +static int cs2000_remove(struct i2c_client *client) +{ + cs2000_clk_unregister(client); + + return 0; +} + +static int cs2000_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct cs2000_priv *priv; + struct device *dev = &client->dev; + u32 rate_in = 0; + u32 rate_out = 0; + int ret; + int ch = 0; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + i2c_set_clientdata(client, priv); + + ret = cs2000_clk_get(client, &rate_in, &rate_out); + if (ret < 0) + return ret; + + ret = cs2000_enable_dev_config(client); + if (ret < 0) + goto probe_err; + + ret = cs2000_clk_in_bound_rate(client, rate_in); + if (ret < 0) + goto probe_err; + + ret = cs2000_ratio_set(client, ch, rate_in, rate_out); + if (ret < 0) + goto probe_err; + + ret = cs2000_ratio_select(client, ch); + if (ret < 0) + goto probe_err; + + ret = cs2000_wait_pll_lock(client); + if (ret < 0) + goto probe_err; + + ret = cs2000_clk_out_enable(client); + if (ret < 0) + goto probe_err; + + ret = cs2000_clk_register(client); + if (ret < 0) + goto probe_err; + + ret = cs2000_version_print(client); + if (ret < 0) + goto probe_err; + + return 0; + +probe_err: + cs2000_remove(client); + + return ret; +} + +static struct i2c_driver cs2000_driver = { + .driver = { + .name = "cs2000-cp", + .owner = THIS_MODULE, + .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 "); +MODULE_LICENSE("GPL v2");