에프에이리눅스 / 1611_0007_prime_oven

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kernel/linux-imx6_3.14.28/drivers/clk/versatile/clk-impd1.c 3.95 KB
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6b13f685e   김민수   BSP 최초 추가 
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  /*
   * Clock driver for the ARM Integrator/IM-PD1 board
   * Copyright (C) 2012-2013 Linus Walleij
   *
   * 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 <linux/clk-provider.h>
  #include <linux/clk.h>
  #include <linux/clkdev.h>
  #include <linux/err.h>
  #include <linux/io.h>
  #include <linux/platform_data/clk-integrator.h>
  
  #include <mach/impd1.h>
  
  #include "clk-icst.h"
  
  struct impd1_clk {
  	char *vco1name;
  	struct clk *vco1clk;
  	char *vco2name;
  	struct clk *vco2clk;
  	struct clk *mmciclk;
  	char *uartname;
  	struct clk *uartclk;
  	char *spiname;
  	struct clk *spiclk;
  	char *scname;
  	struct clk *scclk;
  	struct clk_lookup *clks[6];
  };
  
  /* One entry for each connected IM-PD1 LM */
  static struct impd1_clk impd1_clks[4];
  
  /*
   * There are two VCO's on the IM-PD1
   */
  
  static const struct icst_params impd1_vco1_params = {
  	.ref		= 24000000,	/* 24 MHz */
  	.vco_max	= ICST525_VCO_MAX_3V,
  	.vco_min	= ICST525_VCO_MIN,
  	.vd_min		= 12,
  	.vd_max		= 519,
  	.rd_min		= 3,
  	.rd_max		= 120,
  	.s2div		= icst525_s2div,
  	.idx2s		= icst525_idx2s,
  };
  
  static const struct clk_icst_desc impd1_icst1_desc = {
  	.params = &impd1_vco1_params,
  	.vco_offset = IMPD1_OSC1,
  	.lock_offset = IMPD1_LOCK,
  };
  
  static const struct icst_params impd1_vco2_params = {
  	.ref		= 24000000,	/* 24 MHz */
  	.vco_max	= ICST525_VCO_MAX_3V,
  	.vco_min	= ICST525_VCO_MIN,
  	.vd_min		= 12,
  	.vd_max		= 519,
  	.rd_min		= 3,
  	.rd_max		= 120,
  	.s2div		= icst525_s2div,
  	.idx2s		= icst525_idx2s,
  };
  
  static const struct clk_icst_desc impd1_icst2_desc = {
  	.params = &impd1_vco2_params,
  	.vco_offset = IMPD1_OSC2,
  	.lock_offset = IMPD1_LOCK,
  };
  
  /**
   * integrator_impd1_clk_init() - set up the integrator clock tree
   * @base: base address of the logic module (LM)
   * @id: the ID of this LM
   */
  void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
  {
  	struct impd1_clk *imc;
  	struct clk *clk;
  	int i;
  
  	if (id > 3) {
  		pr_crit("no more than 4 LMs can be attached
  ");
  		return;
  	}
  	imc = &impd1_clks[id];
  
  	imc->vco1name = kasprintf(GFP_KERNEL, "lm%x-vco1", id);
  	clk = icst_clk_register(NULL, &impd1_icst1_desc, imc->vco1name, base);
  	imc->vco1clk = clk;
  	imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
  
  	/* VCO2 is also called "CLK2" */
  	imc->vco2name = kasprintf(GFP_KERNEL, "lm%x-vco2", id);
  	clk = icst_clk_register(NULL, &impd1_icst2_desc, imc->vco2name, base);
  	imc->vco2clk = clk;
  
  	/* MMCI uses CLK2 right off */
  	imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00700", id);
  
  	/* UART reference clock divides CLK2 by a fixed factor 4 */
  	imc->uartname = kasprintf(GFP_KERNEL, "lm%x-uartclk", id);
  	clk = clk_register_fixed_factor(NULL, imc->uartname, imc->vco2name,
  				   CLK_IGNORE_UNUSED, 1, 4);
  	imc->uartclk = clk;
  	imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
  	imc->clks[3] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
  
  	/* SPI PL022 clock divides CLK2 by a fixed factor 64 */
  	imc->spiname = kasprintf(GFP_KERNEL, "lm%x-spiclk", id);
  	clk = clk_register_fixed_factor(NULL, imc->spiname, imc->vco2name,
  				   CLK_IGNORE_UNUSED, 1, 64);
  	imc->clks[4] = clkdev_alloc(clk, NULL, "lm%x:00300", id);
  
  	/* Smart Card clock divides CLK2 by a fixed factor 4 */
  	imc->scname = kasprintf(GFP_KERNEL, "lm%x-scclk", id);
  	clk = clk_register_fixed_factor(NULL, imc->scname, imc->vco2name,
  				   CLK_IGNORE_UNUSED, 1, 4);
  	imc->scclk = clk;
  	imc->clks[5] = clkdev_alloc(clk, NULL, "lm%x:00600", id);
  
  	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
  		clkdev_add(imc->clks[i]);
  }
  
  void integrator_impd1_clk_exit(unsigned int id)
  {
  	int i;
  	struct impd1_clk *imc;
  
  	if (id > 3)
  		return;
  	imc = &impd1_clks[id];
  
  	for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
  		clkdev_drop(imc->clks[i]);
  	clk_unregister(imc->spiclk);
  	clk_unregister(imc->uartclk);
  	clk_unregister(imc->vco2clk);
  	clk_unregister(imc->vco1clk);
  	kfree(imc->scname);
  	kfree(imc->spiname);
  	kfree(imc->uartname);
  	kfree(imc->vco2name);
  	kfree(imc->vco1name);
  }