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kernel/linux-rt-4.4.41/drivers/reset/sti/reset-stih415.c 3.86 KB
5113f6f70   김현기   kernel add
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  /*
   * Copyright (C) 2013 STMicroelectronics (R&D) Limited
   * Author: Stephen Gallimore <stephen.gallimore@st.com>
   * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/of_platform.h>
  #include <linux/platform_device.h>
  
  #include <dt-bindings/reset/stih415-resets.h>
  
  #include "reset-syscfg.h"
  
  /*
   * STiH415 Peripheral powerdown definitions.
   */
  static const char stih415_front[] = "st,stih415-front-syscfg";
  static const char stih415_rear[] = "st,stih415-rear-syscfg";
  static const char stih415_sbc[] = "st,stih415-sbc-syscfg";
  static const char stih415_lpm[] = "st,stih415-lpm-syscfg";
  
  #define STIH415_PDN_FRONT(_bit) \
  	_SYSCFG_RST_CH(stih415_front, SYSCFG_114, _bit, SYSSTAT_187, _bit)
  
  #define STIH415_PDN_REAR(_cntl, _stat) \
  	_SYSCFG_RST_CH(stih415_rear, SYSCFG_336, _cntl, SYSSTAT_384, _stat)
  
  #define STIH415_SRST_REAR(_reg, _bit) \
  	_SYSCFG_RST_CH_NO_ACK(stih415_rear, _reg, _bit)
  
  #define STIH415_SRST_SBC(_reg, _bit) \
  	_SYSCFG_RST_CH_NO_ACK(stih415_sbc, _reg, _bit)
  
  #define STIH415_SRST_FRONT(_reg, _bit) \
  	_SYSCFG_RST_CH_NO_ACK(stih415_front, _reg, _bit)
  
  #define STIH415_SRST_LPM(_reg, _bit) \
  	_SYSCFG_RST_CH_NO_ACK(stih415_lpm, _reg, _bit)
  
  #define SYSCFG_114	0x38 /* Powerdown request EMI/NAND/Keyscan */
  #define SYSSTAT_187	0x15c /* Powerdown status EMI/NAND/Keyscan */
  
  #define SYSCFG_336	0x90 /* Powerdown request USB/SATA/PCIe */
  #define SYSSTAT_384	0x150 /* Powerdown status USB/SATA/PCIe */
  
  #define SYSCFG_376	0x130 /* Reset generator 0 control 0 */
  #define SYSCFG_166	0x108 /* Softreset Ethernet 0 */
  #define SYSCFG_31	0x7c /* Softreset Ethernet 1 */
  #define LPM_SYSCFG_1	0x4 /* Softreset IRB */
  
  static const struct syscfg_reset_channel_data stih415_powerdowns[] = {
  	[STIH415_EMISS_POWERDOWN]	= STIH415_PDN_FRONT(0),
  	[STIH415_NAND_POWERDOWN]	= STIH415_PDN_FRONT(1),
  	[STIH415_KEYSCAN_POWERDOWN]	= STIH415_PDN_FRONT(2),
  	[STIH415_USB0_POWERDOWN]	= STIH415_PDN_REAR(0, 0),
  	[STIH415_USB1_POWERDOWN]	= STIH415_PDN_REAR(1, 1),
  	[STIH415_USB2_POWERDOWN]	= STIH415_PDN_REAR(2, 2),
  	[STIH415_SATA0_POWERDOWN]	= STIH415_PDN_REAR(3, 3),
  	[STIH415_SATA1_POWERDOWN]	= STIH415_PDN_REAR(4, 4),
  	[STIH415_PCIE_POWERDOWN]	= STIH415_PDN_REAR(5, 8),
  };
  
  static const struct syscfg_reset_channel_data stih415_softresets[] = {
  	[STIH415_ETH0_SOFTRESET] = STIH415_SRST_FRONT(SYSCFG_166, 0),
  	[STIH415_ETH1_SOFTRESET] = STIH415_SRST_SBC(SYSCFG_31, 0),
  	[STIH415_IRB_SOFTRESET]	 = STIH415_SRST_LPM(LPM_SYSCFG_1, 6),
  	[STIH415_USB0_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 9),
  	[STIH415_USB1_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 10),
  	[STIH415_USB2_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 11),
  	[STIH415_KEYSCAN_SOFTRESET] = STIH415_SRST_LPM(LPM_SYSCFG_1, 8),
  };
  
  static struct syscfg_reset_controller_data stih415_powerdown_controller = {
  	.wait_for_ack = true,
  	.nr_channels = ARRAY_SIZE(stih415_powerdowns),
  	.channels = stih415_powerdowns,
  };
  
  static struct syscfg_reset_controller_data stih415_softreset_controller = {
  	.wait_for_ack = false,
  	.active_low = true,
  	.nr_channels = ARRAY_SIZE(stih415_softresets),
  	.channels = stih415_softresets,
  };
  
  static const struct of_device_id stih415_reset_match[] = {
  	{ .compatible = "st,stih415-powerdown",
  	  .data = &stih415_powerdown_controller, },
  	{ .compatible = "st,stih415-softreset",
  	  .data = &stih415_softreset_controller, },
  	{},
  };
  
  static struct platform_driver stih415_reset_driver = {
  	.probe = syscfg_reset_probe,
  	.driver = {
  		.name = "reset-stih415",
  		.of_match_table = stih415_reset_match,
  	},
  };
  
  static int __init stih415_reset_init(void)
  {
  	return platform_driver_register(&stih415_reset_driver);
  }
  arch_initcall(stih415_reset_init);