diff options
Diffstat (limited to 'drivers/mfd/cs5535-mfd.c')
| -rw-r--r-- | drivers/mfd/cs5535-mfd.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c new file mode 100644 index 000000000..f9d277ff4 --- /dev/null +++ b/drivers/mfd/cs5535-mfd.c @@ -0,0 +1,196 @@ +/* + * 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/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\n"); + return -EIO; + } + + if (!request_region(res->start, resource_size(res), DRV_NAME)) { + dev_err(&pdev->dev, "can't request region\n"); + 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\n"); + 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) +{ + static 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\n", err); + goto err_disable; + } + cs5535_clone_olpc_cells(); + + dev_info(&pdev->dev, "%zu devices registered.\n", + 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"); |