// SPDX-License-Identifier: GPL-2.0-only

  /*
   * linux/drivers/pcmcia/pxa2xx_balloon3.c
   *
   * Balloon3 PCMCIA specific routines.
   *
   *  Author:	Nick Bane
   *  Created:	June, 2006
   *  Copyright:	Toby Churchill Ltd
   *  Derived from pxa2xx_mainstone.c, by Nico Pitre
   *
   * Various modification by Marek Vasut <marek.vasut@gmail.com>

   */
  
  #include <linux/module.h>
  #include <linux/gpio.h>
  #include <linux/errno.h>
  #include <linux/interrupt.h>
  #include <linux/platform_device.h>
  #include <linux/irq.h>
  #include <linux/io.h>
  
  #include <mach/balloon3.h>

  #include <asm/mach-types.h>

  #include "soc_common.h"

  static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  {
  	uint16_t ver;

  
  	ver = __raw_readw(BALLOON3_FPGA_VER);

  	if (ver < 0x4f08)
  		pr_warn("The FPGA code, version 0x%04x, is too old. "

  			"PCMCIA/CF support might be broken in this version!",
  			ver);
  
  	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;

  	skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
  	skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  	skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
  	skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";

  	return 0;

  }
  
  static unsigned long balloon3_pcmcia_status[2] = {
  	BALLOON3_CF_nSTSCHG_BVD1,
  	BALLOON3_CF_nSTSCHG_BVD1
  };
  
  static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  				    struct pcmcia_state *state)
  {
  	uint16_t status;
  	int flip;
  
  	/* This actually reads the STATUS register */
  	status = __raw_readw(BALLOON3_CF_STATUS_REG);
  	flip = (status ^ balloon3_pcmcia_status[skt->nr])
  		& BALLOON3_CF_nSTSCHG_BVD1;
  	/*
  	 * Workaround for STSCHG which can't be deasserted:
  	 * We therefore disable/enable corresponding IRQs
  	 * as needed to avoid IRQ locks.
  	 */
  	if (flip) {
  		balloon3_pcmcia_status[skt->nr] = status;
  		if (status & BALLOON3_CF_nSTSCHG_BVD1)
  			enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  		else
  			disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  	}

  	state->ready	= !!(status & BALLOON3_CF_nIRQ);
  	state->bvd1	= !!(status & BALLOON3_CF_nSTSCHG_BVD1);
  	state->bvd2	= 0;	/* not available */
  	state->vs_3v	= 1;	/* Always true its a CF card */
  	state->vs_Xv	= 0;	/* not available */

  }
  
  static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  				       const socket_state_t *state)
  {

  	__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +

  			((state->flags & SS_RESET) ?
  			BALLOON3_FPGA_SETnCLR : 0));

  	return 0;
  }

  static struct pcmcia_low_level balloon3_pcmcia_ops = {
  	.owner			= THIS_MODULE,
  	.hw_init		= balloon3_pcmcia_hw_init,

  	.socket_state		= balloon3_pcmcia_socket_state,
  	.configure_socket	= balloon3_pcmcia_configure_socket,

  	.first			= 0,
  	.nr			= 1,
  };
  
  static struct platform_device *balloon3_pcmcia_device;
  
  static int __init balloon3_pcmcia_init(void)
  {
  	int ret;

  	if (!machine_is_balloon3())
  		return -ENODEV;

  	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
  	if (!balloon3_pcmcia_device)
  		return -ENOMEM;
  
  	ret = platform_device_add_data(balloon3_pcmcia_device,
  			&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
  
  	if (!ret)
  		ret = platform_device_add(balloon3_pcmcia_device);
  
  	if (ret)
  		platform_device_put(balloon3_pcmcia_device);
  
  	return ret;
  }
  
  static void __exit balloon3_pcmcia_exit(void)
  {
  	platform_device_unregister(balloon3_pcmcia_device);
  }
  
  module_init(balloon3_pcmcia_init);
  module_exit(balloon3_pcmcia_exit);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
  MODULE_ALIAS("platform:pxa2xx-pcmcia");
  MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");