/*
   * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
   *
   * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
   * used for accessing GPIOs, MFGPTs, ACPI, etc.  Each subdevice has
   * an IO range that's specified in a single BAR.  The BAR order is
   * hardcoded in the CS553x specifications.
   *
   * Copyright (c) 2010  Andres Salomon <dilinger@queued.net>
   *
   * 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.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/mfd/core.h>
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <asm/olpc.h>
  
  #define DRV_NAME "cs5535-mfd"
  
  enum cs5535_mfd_bars {
  	SMB_BAR = 0,
  	GPIO_BAR = 1,
  	MFGPT_BAR = 2,
  	PMS_BAR = 4,
  	ACPI_BAR = 5,
  	NR_BARS,
  };
  
  static int cs5535_mfd_res_enable(struct platform_device *pdev)
  {
  	struct resource *res;
  
  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  	if (!res) {
  		dev_err(&pdev->dev, "can't fetch device resource info
  ");
  		return -EIO;
  	}
  
  	if (!request_region(res->start, resource_size(res), DRV_NAME)) {
  		dev_err(&pdev->dev, "can't request region
  ");
  		return -EIO;
  	}
  
  	return 0;
  }
  
  static int cs5535_mfd_res_disable(struct platform_device *pdev)
  {
  	struct resource *res;
  	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  	if (!res) {
  		dev_err(&pdev->dev, "can't fetch device resource info
  ");
  		return -EIO;
  	}
  
  	release_region(res->start, resource_size(res));
  	return 0;
  }
  
  static struct resource cs5535_mfd_resources[NR_BARS];
  
  static struct mfd_cell cs5535_mfd_cells[] = {
  	{
  		.id = SMB_BAR,
  		.name = "cs5535-smb",
  		.num_resources = 1,
  		.resources = &cs5535_mfd_resources[SMB_BAR],
  	},
  	{
  		.id = GPIO_BAR,
  		.name = "cs5535-gpio",
  		.num_resources = 1,
  		.resources = &cs5535_mfd_resources[GPIO_BAR],
  	},
  	{
  		.id = MFGPT_BAR,
  		.name = "cs5535-mfgpt",
  		.num_resources = 1,
  		.resources = &cs5535_mfd_resources[MFGPT_BAR],
  	},
  	{
  		.id = PMS_BAR,
  		.name = "cs5535-pms",
  		.num_resources = 1,
  		.resources = &cs5535_mfd_resources[PMS_BAR],
  
  		.enable = cs5535_mfd_res_enable,
  		.disable = cs5535_mfd_res_disable,
  	},
  	{
  		.id = ACPI_BAR,
  		.name = "cs5535-acpi",
  		.num_resources = 1,
  		.resources = &cs5535_mfd_resources[ACPI_BAR],
  
  		.enable = cs5535_mfd_res_enable,
  		.disable = cs5535_mfd_res_disable,
  	},
  };
  
  #ifdef CONFIG_OLPC
  static void cs5535_clone_olpc_cells(void)
  {
  	const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
  
  	if (!machine_is_olpc())
  		return;
  
  	mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
  }
  #else
  static void cs5535_clone_olpc_cells(void) { }
  #endif
  
  static int cs5535_mfd_probe(struct pci_dev *pdev,
  		const struct pci_device_id *id)
  {
  	int err, i;
  
  	err = pci_enable_device(pdev);
  	if (err)
  		return err;
  
  	/* fill in IO range for each cell; subdrivers handle the region */
  	for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
  		int bar = cs5535_mfd_cells[i].id;
  		struct resource *r = &cs5535_mfd_resources[bar];
  
  		r->flags = IORESOURCE_IO;
  		r->start = pci_resource_start(pdev, bar);
  		r->end = pci_resource_end(pdev, bar);
  
  		/* id is used for temporarily storing BAR; unset it now */
  		cs5535_mfd_cells[i].id = 0;
  	}
  
  	err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
  			      ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
  	if (err) {
  		dev_err(&pdev->dev, "MFD add devices failed: %d
  ", err);
  		goto err_disable;
  	}
  	cs5535_clone_olpc_cells();
  
  	dev_info(&pdev->dev, "%zu devices registered.
  ",
  			ARRAY_SIZE(cs5535_mfd_cells));
  
  	return 0;
  
  err_disable:
  	pci_disable_device(pdev);
  	return err;
  }
  
  static void cs5535_mfd_remove(struct pci_dev *pdev)
  {
  	mfd_remove_devices(&pdev->dev);
  	pci_disable_device(pdev);
  }
  
  static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
  	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
  	{ 0, }
  };
  MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
  
  static struct pci_driver cs5535_mfd_driver = {
  	.name = DRV_NAME,
  	.id_table = cs5535_mfd_pci_tbl,
  	.probe = cs5535_mfd_probe,
  	.remove = cs5535_mfd_remove,
  };
  
  module_pci_driver(cs5535_mfd_driver);
  
  MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
  MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
  MODULE_LICENSE("GPL");