clk: si570: Add a driver for SI570 oscillators
Add a driver for SILabs 570, 571, 598, 599 programmable oscillators. The devices generate low-jitter clock signals and are reprogrammable via an I2C interface. Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Soren Brinkmann
Mike Turquette
Родитель
3a5aec246f
Коммит
1459c83703
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@ -0,0 +1,39 @@
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Binding for Silicon Labs 570, 571, 598 and 599 programmable
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I2C clock generators.
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Reference
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This binding uses the common clock binding[1]. Details about the devices can be
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found in the data sheets[2][3].
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[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
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[2] Si570/571 Data Sheet
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http://www.silabs.com/Support%20Documents/TechnicalDocs/si570.pdf
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[3] Si598/599 Data Sheet
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http://www.silabs.com/Support%20Documents/TechnicalDocs/si598-99.pdf
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Required properties:
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- compatible: Shall be one of "silabs,si570", "silabs,si571",
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"silabs,si598", "silabs,si599"
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- reg: I2C device address.
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- #clock-cells: From common clock bindings: Shall be 0.
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- factory-fout: Factory set default frequency. This frequency is part specific.
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The correct frequency for the part used has to be provided in
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order to generate the correct output frequencies. For more
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details, please refer to the data sheet.
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- temperature-stability: Temperature stability of the device in PPM. Should be
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one of: 7, 20, 50 or 100.
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Optional properties:
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- clock-output-names: From common clock bindings. Recommended to be "si570".
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- clock-frequency: Output frequency to generate. This defines the output
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frequency set during boot. It can be reprogrammed during
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runtime through the common clock framework.
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Example:
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si570: clock-generator@5d {
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#clock-cells = <0>;
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compatible = "silabs,si570";
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temperature-stability = <50>;
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reg = <0x5d>;
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factory-fout = <156250000>;
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};
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@ -64,6 +64,16 @@ config COMMON_CLK_SI5351
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This driver supports Silicon Labs 5351A/B/C programmable clock
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generators.
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config COMMON_CLK_SI570
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tristate "Clock driver for SiLabs 570 and compatible devices"
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depends on I2C
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depends on OF
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select REGMAP_I2C
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help
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---help---
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This driver supports Silicon Labs 570/571/598/599 programmable
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clock generators.
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config COMMON_CLK_S2MPS11
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tristate "Clock driver for S2MPS11 MFD"
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depends on MFD_SEC_CORE
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@ -45,6 +45,7 @@ obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o
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obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
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obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
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obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
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obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o
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obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
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obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o
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obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o
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@ -0,0 +1,531 @@
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/*
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* Driver for Silicon Labs Si570/Si571 Programmable XO/VCXO
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*
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* Copyright (C) 2010, 2011 Ericsson AB.
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* Copyright (C) 2011 Guenter Roeck.
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* Copyright (C) 2011 - 2013 Xilinx Inc.
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*
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* Author: Guenter Roeck <guenter.roeck@ericsson.com>
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* Sören Brinkmann <soren.brinkmann@xilinx.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/module.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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/* Si570 registers */
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#define SI570_REG_HS_N1 7
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#define SI570_REG_N1_RFREQ0 8
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#define SI570_REG_RFREQ1 9
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#define SI570_REG_RFREQ2 10
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#define SI570_REG_RFREQ3 11
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#define SI570_REG_RFREQ4 12
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#define SI570_REG_CONTROL 135
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#define SI570_REG_FREEZE_DCO 137
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#define SI570_DIV_OFFSET_7PPM 6
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#define HS_DIV_SHIFT 5
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#define HS_DIV_MASK 0xe0
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#define HS_DIV_OFFSET 4
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#define N1_6_2_MASK 0x1f
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#define N1_1_0_MASK 0xc0
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#define RFREQ_37_32_MASK 0x3f
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#define SI570_MIN_FREQ 10000000L
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#define SI570_MAX_FREQ 1417500000L
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#define SI598_MAX_FREQ 525000000L
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#define FDCO_MIN 4850000000LL
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#define FDCO_MAX 5670000000LL
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#define SI570_CNTRL_RECALL (1 << 0)
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#define SI570_CNTRL_FREEZE_M (1 << 5)
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#define SI570_CNTRL_NEWFREQ (1 << 6)
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#define SI570_FREEZE_DCO (1 << 4)
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/**
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* struct clk_si570:
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* @hw: Clock hw struct
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* @regmap: Device's regmap
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* @div_offset: Rgister offset for dividers
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* @max_freq: Maximum frequency for this device
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* @fxtal: Factory xtal frequency
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* @n1: Clock divider N1
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* @hs_div: Clock divider HSDIV
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* @rfreq: Clock multiplier RFREQ
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* @frequency: Current output frequency
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* @i2c_client: I2C client pointer
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*/
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struct clk_si570 {
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struct clk_hw hw;
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struct regmap *regmap;
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unsigned int div_offset;
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u64 max_freq;
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u64 fxtal;
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unsigned int n1;
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unsigned int hs_div;
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u64 rfreq;
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u64 frequency;
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struct i2c_client *i2c_client;
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};
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#define to_clk_si570(_hw) container_of(_hw, struct clk_si570, hw)
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enum clk_si570_variant {
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si57x,
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si59x
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};
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/**
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* si570_get_divs() - Read clock dividers from HW
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* @data: Pointer to struct clk_si570
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* @rfreq: Fractional multiplier (output)
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* @n1: Divider N1 (output)
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* @hs_div: Divider HSDIV (output)
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* Returns 0 on success, negative errno otherwise.
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*
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* Retrieve clock dividers and multipliers from the HW.
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*/
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static int si570_get_divs(struct clk_si570 *data, u64 *rfreq,
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unsigned int *n1, unsigned int *hs_div)
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{
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int err;
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u8 reg[6];
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u64 tmp;
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err = regmap_bulk_read(data->regmap, SI570_REG_HS_N1 + data->div_offset,
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reg, ARRAY_SIZE(reg));
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if (err)
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return err;
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*hs_div = ((reg[0] & HS_DIV_MASK) >> HS_DIV_SHIFT) + HS_DIV_OFFSET;
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*n1 = ((reg[0] & N1_6_2_MASK) << 2) + ((reg[1] & N1_1_0_MASK) >> 6) + 1;
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/* Handle invalid cases */
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if (*n1 > 1)
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*n1 &= ~1;
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tmp = reg[1] & RFREQ_37_32_MASK;
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tmp = (tmp << 8) + reg[2];
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tmp = (tmp << 8) + reg[3];
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tmp = (tmp << 8) + reg[4];
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tmp = (tmp << 8) + reg[5];
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*rfreq = tmp;
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return 0;
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}
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/**
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* si570_get_defaults() - Get default values
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* @data: Driver data structure
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* @fout: Factory frequency output
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* Returns 0 on success, negative errno otherwise.
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*/
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static int si570_get_defaults(struct clk_si570 *data, u64 fout)
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{
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int err;
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u64 fdco;
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regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_RECALL);
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err = si570_get_divs(data, &data->rfreq, &data->n1, &data->hs_div);
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if (err)
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return err;
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/*
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* Accept optional precision loss to avoid arithmetic overflows.
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* Acceptable per Silicon Labs Application Note AN334.
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*/
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fdco = fout * data->n1 * data->hs_div;
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if (fdco >= (1LL << 36))
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data->fxtal = div64_u64(fdco << 24, data->rfreq >> 4);
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else
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data->fxtal = div64_u64(fdco << 28, data->rfreq);
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data->frequency = fout;
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return 0;
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}
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/**
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* si570_update_rfreq() - Update clock multiplier
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* @data: Driver data structure
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* Passes on regmap_bulk_write() return value.
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*/
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static int si570_update_rfreq(struct clk_si570 *data)
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{
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u8 reg[5];
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reg[0] = ((data->n1 - 1) << 6) |
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((data->rfreq >> 32) & RFREQ_37_32_MASK);
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reg[1] = (data->rfreq >> 24) & 0xff;
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reg[2] = (data->rfreq >> 16) & 0xff;
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reg[3] = (data->rfreq >> 8) & 0xff;
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reg[4] = data->rfreq & 0xff;
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return regmap_bulk_write(data->regmap, SI570_REG_N1_RFREQ0 +
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data->div_offset, reg, ARRAY_SIZE(reg));
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}
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/**
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* si570_calc_divs() - Caluclate clock dividers
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* @frequency: Target frequency
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* @data: Driver data structure
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* @out_rfreq: RFREG fractional multiplier (output)
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* @out_n1: Clock divider N1 (output)
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* @out_hs_div: Clock divider HSDIV (output)
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* Returns 0 on success, negative errno otherwise.
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*
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* Calculate the clock dividers (@out_hs_div, @out_n1) and clock multiplier
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* (@out_rfreq) for a given target @frequency.
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*/
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static int si570_calc_divs(unsigned long frequency, struct clk_si570 *data,
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u64 *out_rfreq, unsigned int *out_n1, unsigned int *out_hs_div)
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{
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int i;
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unsigned int n1, hs_div;
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u64 fdco, best_fdco = ULLONG_MAX;
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static const uint8_t si570_hs_div_values[] = { 11, 9, 7, 6, 5, 4 };
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for (i = 0; i < ARRAY_SIZE(si570_hs_div_values); i++) {
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hs_div = si570_hs_div_values[i];
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/* Calculate lowest possible value for n1 */
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n1 = div_u64(div_u64(FDCO_MIN, hs_div), frequency);
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if (!n1 || (n1 & 1))
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n1++;
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while (n1 <= 128) {
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fdco = (u64)frequency * (u64)hs_div * (u64)n1;
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if (fdco > FDCO_MAX)
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break;
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if (fdco >= FDCO_MIN && fdco < best_fdco) {
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*out_n1 = n1;
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*out_hs_div = hs_div;
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*out_rfreq = div64_u64(fdco << 28, data->fxtal);
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best_fdco = fdco;
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}
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n1 += (n1 == 1 ? 1 : 2);
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}
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}
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if (best_fdco == ULLONG_MAX)
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return -EINVAL;
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return 0;
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}
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static unsigned long si570_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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int err;
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u64 rfreq, rate;
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unsigned int n1, hs_div;
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struct clk_si570 *data = to_clk_si570(hw);
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err = si570_get_divs(data, &rfreq, &n1, &hs_div);
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if (err) {
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dev_err(&data->i2c_client->dev, "unable to recalc rate\n");
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return data->frequency;
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}
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rfreq = div_u64(rfreq, hs_div * n1);
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rate = (data->fxtal * rfreq) >> 28;
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return rate;
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}
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static long si570_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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int err;
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u64 rfreq;
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unsigned int n1, hs_div;
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struct clk_si570 *data = to_clk_si570(hw);
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if (!rate)
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return 0;
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if (div64_u64(abs(rate - data->frequency) * 10000LL,
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data->frequency) < 35) {
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rfreq = div64_u64((data->rfreq * rate) +
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div64_u64(data->frequency, 2), data->frequency);
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n1 = data->n1;
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hs_div = data->hs_div;
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} else {
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err = si570_calc_divs(rate, data, &rfreq, &n1, &hs_div);
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if (err) {
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dev_err(&data->i2c_client->dev,
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"unable to round rate\n");
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return 0;
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}
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}
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return rate;
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}
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/**
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* si570_set_frequency() - Adjust output frequency
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* @data: Driver data structure
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* @frequency: Target frequency
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* Returns 0 on success.
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*
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* Update output frequency for big frequency changes (> 3,500 ppm).
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*/
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static int si570_set_frequency(struct clk_si570 *data, unsigned long frequency)
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{
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int err;
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err = si570_calc_divs(frequency, data, &data->rfreq, &data->n1,
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&data->hs_div);
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if (err)
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return err;
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/*
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* The DCO reg should be accessed with a read-modify-write operation
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* per AN334
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*/
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regmap_write(data->regmap, SI570_REG_FREEZE_DCO, SI570_FREEZE_DCO);
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regmap_write(data->regmap, SI570_REG_HS_N1 + data->div_offset,
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((data->hs_div - HS_DIV_OFFSET) << HS_DIV_SHIFT) |
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(((data->n1 - 1) >> 2) & N1_6_2_MASK));
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si570_update_rfreq(data);
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regmap_write(data->regmap, SI570_REG_FREEZE_DCO, 0);
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regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_NEWFREQ);
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/* Applying a new frequency can take up to 10ms */
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usleep_range(10000, 12000);
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return 0;
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}
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/**
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* si570_set_frequency_small() - Adjust output frequency
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* @data: Driver data structure
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* @frequency: Target frequency
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* Returns 0 on success.
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*
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* Update output frequency for small frequency changes (< 3,500 ppm).
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*/
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static int si570_set_frequency_small(struct clk_si570 *data,
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unsigned long frequency)
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{
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/*
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* This is a re-implementation of DIV_ROUND_CLOSEST
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* using the div64_u64 function lieu of letting the compiler
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* insert EABI calls
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*/
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data->rfreq = div64_u64((data->rfreq * frequency) +
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div_u64(data->frequency, 2), data->frequency);
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regmap_write(data->regmap, SI570_REG_CONTROL, SI570_CNTRL_FREEZE_M);
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si570_update_rfreq(data);
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regmap_write(data->regmap, SI570_REG_CONTROL, 0);
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/* Applying a new frequency (small change) can take up to 100us */
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usleep_range(100, 200);
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return 0;
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}
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static int si570_set_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 clk_si570 *data = to_clk_si570(hw);
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struct i2c_client *client = data->i2c_client;
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int err;
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if (rate < SI570_MIN_FREQ || rate > data->max_freq) {
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dev_err(&client->dev,
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"requested frequency %lu Hz is out of range\n", rate);
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return -EINVAL;
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}
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if (div64_u64(abs(rate - data->frequency) * 10000LL,
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data->frequency) < 35)
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err = si570_set_frequency_small(data, rate);
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else
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err = si570_set_frequency(data, rate);
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if (err)
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return err;
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data->frequency = rate;
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return 0;
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}
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static const struct clk_ops si570_clk_ops = {
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.recalc_rate = si570_recalc_rate,
|
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.round_rate = si570_round_rate,
|
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.set_rate = si570_set_rate,
|
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};
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static bool si570_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
|
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switch (reg) {
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case SI570_REG_CONTROL:
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return true;
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default:
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return false;
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}
|
||||
}
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static bool si570_regmap_is_writeable(struct device *dev, unsigned int reg)
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{
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||||
switch (reg) {
|
||||
case SI570_REG_HS_N1 ... (SI570_REG_RFREQ4 + SI570_DIV_OFFSET_7PPM):
|
||||
case SI570_REG_CONTROL:
|
||||
case SI570_REG_FREEZE_DCO:
|
||||
return true;
|
||||
default:
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
static struct regmap_config si570_regmap_config = {
|
||||
.reg_bits = 8,
|
||||
.val_bits = 8,
|
||||
.cache_type = REGCACHE_RBTREE,
|
||||
.max_register = 137,
|
||||
.writeable_reg = si570_regmap_is_writeable,
|
||||
.volatile_reg = si570_regmap_is_volatile,
|
||||
};
|
||||
|
||||
static int si570_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct clk_si570 *data;
|
||||
struct clk_init_data init;
|
||||
struct clk *clk;
|
||||
u32 initial_fout, factory_fout, stability;
|
||||
int err;
|
||||
enum clk_si570_variant variant = id->driver_data;
|
||||
|
||||
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
init.ops = &si570_clk_ops;
|
||||
init.flags = CLK_IS_ROOT;
|
||||
init.num_parents = 0;
|
||||
data->hw.init = &init;
|
||||
data->i2c_client = client;
|
||||
|
||||
if (variant == si57x) {
|
||||
err = of_property_read_u32(client->dev.of_node,
|
||||
"temperature-stability", &stability);
|
||||
if (err) {
|
||||
dev_err(&client->dev,
|
||||
"'temperature-stability' property missing\n");
|
||||
return err;
|
||||
}
|
||||
/* adjust register offsets for 7ppm devices */
|
||||
if (stability == 7)
|
||||
data->div_offset = SI570_DIV_OFFSET_7PPM;
|
||||
|
||||
data->max_freq = SI570_MAX_FREQ;
|
||||
} else {
|
||||
data->max_freq = SI598_MAX_FREQ;
|
||||
}
|
||||
|
||||
if (of_property_read_string(client->dev.of_node, "clock-output-names",
|
||||
&init.name))
|
||||
init.name = client->dev.of_node->name;
|
||||
|
||||
err = of_property_read_u32(client->dev.of_node, "factory-fout",
|
||||
&factory_fout);
|
||||
if (err) {
|
||||
dev_err(&client->dev, "'factory-fout' property missing\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
data->regmap = devm_regmap_init_i2c(client, &si570_regmap_config);
|
||||
if (IS_ERR(data->regmap)) {
|
||||
dev_err(&client->dev, "failed to allocate register map\n");
|
||||
return PTR_ERR(data->regmap);
|
||||
}
|
||||
|
||||
i2c_set_clientdata(client, data);
|
||||
err = si570_get_defaults(data, factory_fout);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
clk = devm_clk_register(&client->dev, &data->hw);
|
||||
if (IS_ERR(clk)) {
|
||||
dev_err(&client->dev, "clock registration failed\n");
|
||||
return PTR_ERR(clk);
|
||||
}
|
||||
err = of_clk_add_provider(client->dev.of_node, of_clk_src_simple_get,
|
||||
clk);
|
||||
if (err) {
|
||||
dev_err(&client->dev, "unable to add clk provider\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Read the requested initial output frequency from device tree */
|
||||
if (!of_property_read_u32(client->dev.of_node, "clock-frequency",
|
||||
&initial_fout)) {
|
||||
err = clk_set_rate(clk, initial_fout);
|
||||
if (err) {
|
||||
of_clk_del_provider(client->dev.of_node);
|
||||
return err;
|
||||
}
|
||||
}
|
||||
|
||||
/* Display a message indicating that we've successfully registered */
|
||||
dev_info(&client->dev, "registered, current frequency %llu Hz\n",
|
||||
data->frequency);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int si570_remove(struct i2c_client *client)
|
||||
{
|
||||
of_clk_del_provider(client->dev.of_node);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id si570_id[] = {
|
||||
{ "si570", si57x },
|
||||
{ "si571", si57x },
|
||||
{ "si598", si59x },
|
||||
{ "si599", si59x },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, si570_id);
|
||||
|
||||
static const struct of_device_id clk_si570_of_match[] = {
|
||||
{ .compatible = "silabs,si570" },
|
||||
{ .compatible = "silabs,si571" },
|
||||
{ .compatible = "silabs,si598" },
|
||||
{ .compatible = "silabs,si599" },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, clk_si570_of_match);
|
||||
|
||||
static struct i2c_driver si570_driver = {
|
||||
.driver = {
|
||||
.name = "si570",
|
||||
.of_match_table = of_match_ptr(clk_si570_of_match),
|
||||
},
|
||||
.probe = si570_probe,
|
||||
.remove = si570_remove,
|
||||
.id_table = si570_id,
|
||||
};
|
||||
module_i2c_driver(si570_driver);
|
||||
|
||||
MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>");
|
||||
MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com");
|
||||
MODULE_DESCRIPTION("Si570 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
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