diff options
Diffstat (limited to 'drivers/mfd/sta2x11-mfd.c')
| -rw-r--r-- | drivers/mfd/sta2x11-mfd.c | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/mfd/sta2x11-mfd.c b/drivers/mfd/sta2x11-mfd.c new file mode 100644 index 0000000..d31fed0 --- /dev/null +++ b/drivers/mfd/sta2x11-mfd.c @@ -0,0 +1,467 @@ +/* + * Copyright (c) 2009-2011 Wind River Systems, Inc. + * Copyright (c) 2011 ST Microelectronics (Alessandro Rubini) + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/errno.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/pci.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/platform_device.h> +#include <linux/mfd/core.h> +#include <linux/mfd/sta2x11-mfd.h> + +#include <asm/sta2x11.h> + +/* This describes STA2X11 MFD chip for us, we may have several */ +struct sta2x11_mfd { + struct sta2x11_instance *instance; + spinlock_t lock; + struct list_head list; + void __iomem *sctl_regs; + void __iomem *apbreg_regs; +}; + +static LIST_HEAD(sta2x11_mfd_list); + +/* Three functions to act on the list */ +static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev) +{ + struct sta2x11_instance *instance; + struct sta2x11_mfd *mfd; + + if (!pdev && !list_empty(&sta2x11_mfd_list)) { + pr_warning("%s: Unspecified device, " + "using first instance\n", __func__); + return list_entry(sta2x11_mfd_list.next, + struct sta2x11_mfd, list); + } + + instance = sta2x11_get_instance(pdev); + if (!instance) + return NULL; + list_for_each_entry(mfd, &sta2x11_mfd_list, list) { + if (mfd->instance == instance) + return mfd; + } + return NULL; +} + +static int __devinit sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags) +{ + struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev); + struct sta2x11_instance *instance; + + if (mfd) + return -EBUSY; + instance = sta2x11_get_instance(pdev); + if (!instance) + return -EINVAL; + mfd = kzalloc(sizeof(*mfd), flags); + if (!mfd) + return -ENOMEM; + INIT_LIST_HEAD(&mfd->list); + spin_lock_init(&mfd->lock); + mfd->instance = instance; + list_add(&mfd->list, &sta2x11_mfd_list); + return 0; +} + +static int __devexit mfd_remove(struct pci_dev *pdev) +{ + struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev); + + if (!mfd) + return -ENODEV; + list_del(&mfd->list); + kfree(mfd); + return 0; +} + +/* These two functions are exported and are not expected to fail */ +u32 sta2x11_sctl_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val) +{ + struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev); + u32 r; + unsigned long flags; + + if (!mfd) { + dev_warn(&pdev->dev, ": can't access sctl regs\n"); + return 0; + } + if (!mfd->sctl_regs) { + dev_warn(&pdev->dev, ": system ctl not initialized\n"); + return 0; + } + spin_lock_irqsave(&mfd->lock, flags); + r = readl(mfd->sctl_regs + reg); + r &= ~mask; + r |= val; + if (mask) + writel(r, mfd->sctl_regs + reg); + spin_unlock_irqrestore(&mfd->lock, flags); + return r; +} +EXPORT_SYMBOL(sta2x11_sctl_mask); + +u32 sta2x11_apbreg_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val) +{ + struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev); + u32 r; + unsigned long flags; + + if (!mfd) { + dev_warn(&pdev->dev, ": can't access apb regs\n"); + return 0; + } + if (!mfd->apbreg_regs) { + dev_warn(&pdev->dev, ": apb bridge not initialized\n"); + return 0; + } + spin_lock_irqsave(&mfd->lock, flags); + r = readl(mfd->apbreg_regs + reg); + r &= ~mask; + r |= val; + if (mask) + writel(r, mfd->apbreg_regs + reg); + spin_unlock_irqrestore(&mfd->lock, flags); + return r; +} +EXPORT_SYMBOL(sta2x11_apbreg_mask); + +/* Two debugfs files, for our registers (FIXME: one instance only) */ +#define REG(regname) {.name = #regname, .offset = SCTL_ ## regname} +static struct debugfs_reg32 sta2x11_sctl_regs[] = { + REG(SCCTL), REG(ARMCFG), REG(SCPLLCTL), REG(SCPLLFCTRL), + REG(SCRESFRACT), REG(SCRESCTRL1), REG(SCRESXTRL2), REG(SCPEREN0), + REG(SCPEREN1), REG(SCPEREN2), REG(SCGRST), REG(SCPCIPMCR1), + REG(SCPCIPMCR2), REG(SCPCIPMSR1), REG(SCPCIPMSR2), REG(SCPCIPMSR3), + REG(SCINTREN), REG(SCRISR), REG(SCCLKSTAT0), REG(SCCLKSTAT1), + REG(SCCLKSTAT2), REG(SCRSTSTA), +}; +#undef REG + +static struct debugfs_regset32 sctl_regset = { + .regs = sta2x11_sctl_regs, + .nregs = ARRAY_SIZE(sta2x11_sctl_regs), +}; + +#define REG(regname) {.name = #regname, .offset = regname} +static struct debugfs_reg32 sta2x11_apbreg_regs[] = { + REG(APBREG_BSR), REG(APBREG_PAER), REG(APBREG_PWAC), REG(APBREG_PRAC), + REG(APBREG_PCG), REG(APBREG_PUR), REG(APBREG_EMU_PCG), +}; +#undef REG + +static struct debugfs_regset32 apbreg_regset = { + .regs = sta2x11_apbreg_regs, + .nregs = ARRAY_SIZE(sta2x11_apbreg_regs), +}; + +static struct dentry *sta2x11_sctl_debugfs; +static struct dentry *sta2x11_apbreg_debugfs; + +/* Probe for the two platform devices */ +static int sta2x11_sctl_probe(struct platform_device *dev) +{ + struct pci_dev **pdev; + struct sta2x11_mfd *mfd; + struct resource *res; + + pdev = dev->dev.platform_data; + mfd = sta2x11_mfd_find(*pdev); + if (!mfd) + return -ENODEV; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) + return -ENOMEM; + + if (!request_mem_region(res->start, resource_size(res), + "sta2x11-sctl")) + return -EBUSY; + + mfd->sctl_regs = ioremap(res->start, resource_size(res)); + if (!mfd->sctl_regs) { + release_mem_region(res->start, resource_size(res)); + return -ENOMEM; + } + sctl_regset.base = mfd->sctl_regs; + sta2x11_sctl_debugfs = debugfs_create_regset32("sta2x11-sctl", + S_IFREG | S_IRUGO, + NULL, &sctl_regset); + return 0; +} + +static int sta2x11_apbreg_probe(struct platform_device *dev) +{ + struct pci_dev **pdev; + struct sta2x11_mfd *mfd; + struct resource *res; + + pdev = dev->dev.platform_data; + dev_dbg(&dev->dev, "%s: pdata is %p\n", __func__, pdev); + dev_dbg(&dev->dev, "%s: *pdata is %p\n", __func__, *pdev); + + mfd = sta2x11_mfd_find(*pdev); + if (!mfd) + return -ENODEV; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) + return -ENOMEM; + + if (!request_mem_region(res->start, resource_size(res), + "sta2x11-apbreg")) + return -EBUSY; + + mfd->apbreg_regs = ioremap(res->start, resource_size(res)); + if (!mfd->apbreg_regs) { + release_mem_region(res->start, resource_size(res)); + return -ENOMEM; + } + dev_dbg(&dev->dev, "%s: regbase %p\n", __func__, mfd->apbreg_regs); + + apbreg_regset.base = mfd->apbreg_regs; + sta2x11_apbreg_debugfs = debugfs_create_regset32("sta2x11-apbreg", + S_IFREG | S_IRUGO, + NULL, &apbreg_regset); + return 0; +} + +/* The two platform drivers */ +static struct platform_driver sta2x11_sctl_platform_driver = { + .driver = { + .name = "sta2x11-sctl", + .owner = THIS_MODULE, + }, + .probe = sta2x11_sctl_probe, +}; + +static int __init sta2x11_sctl_init(void) +{ + pr_info("%s\n", __func__); + return platform_driver_register(&sta2x11_sctl_platform_driver); +} + +static struct platform_driver sta2x11_platform_driver = { + .driver = { + .name = "sta2x11-apbreg", + .owner = THIS_MODULE, + }, + .probe = sta2x11_apbreg_probe, +}; + +static int __init sta2x11_apbreg_init(void) +{ + pr_info("%s\n", __func__); + return platform_driver_register(&sta2x11_platform_driver); +} + +/* + * What follows is the PCI device that hosts the above two pdevs. + * Each logic block is 4kB and they are all consecutive: we use this info. + */ + +/* Bar 0 */ +enum bar0_cells { + STA2X11_GPIO_0 = 0, + STA2X11_GPIO_1, + STA2X11_GPIO_2, + STA2X11_GPIO_3, + STA2X11_SCTL, + STA2X11_SCR, + STA2X11_TIME, +}; +/* Bar 1 */ +enum bar1_cells { + STA2X11_APBREG = 0, +}; +#define CELL_4K(_name, _cell) { \ + .name = _name, \ + .start = _cell * 4096, .end = _cell * 4096 + 4095, \ + .flags = IORESOURCE_MEM, \ + } + +static const __devinitconst struct resource gpio_resources[] = { + { + .name = "sta2x11_gpio", /* 4 consecutive cells, 1 driver */ + .start = 0, + .end = (4 * 4096) - 1, + .flags = IORESOURCE_MEM, + } +}; +static const __devinitconst struct resource sctl_resources[] = { + CELL_4K("sta2x11-sctl", STA2X11_SCTL), +}; +static const __devinitconst struct resource scr_resources[] = { + CELL_4K("sta2x11-scr", STA2X11_SCR), +}; +static const __devinitconst struct resource time_resources[] = { + CELL_4K("sta2x11-time", STA2X11_TIME), +}; + +static const __devinitconst struct resource apbreg_resources[] = { + CELL_4K("sta2x11-apbreg", STA2X11_APBREG), +}; + +#define DEV(_name, _r) \ + { .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, } + +static __devinitdata struct mfd_cell sta2x11_mfd_bar0[] = { + DEV("sta2x11-gpio", gpio_resources), /* offset 0: we add pdata later */ + DEV("sta2x11-sctl", sctl_resources), + DEV("sta2x11-scr", scr_resources), + DEV("sta2x11-time", time_resources), +}; + +static __devinitdata struct mfd_cell sta2x11_mfd_bar1[] = { + DEV("sta2x11-apbreg", apbreg_resources), +}; + +static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state) +{ + pci_save_state(pdev); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + + return 0; +} + +static int sta2x11_mfd_resume(struct pci_dev *pdev) +{ + int err; + + pci_set_power_state(pdev, 0); + err = pci_enable_device(pdev); + if (err) + return err; + pci_restore_state(pdev); + + return 0; +} + +static int __devinit sta2x11_mfd_probe(struct pci_dev *pdev, + const struct pci_device_id *pci_id) +{ + int err, i; + struct sta2x11_gpio_pdata *gpio_data; + + dev_info(&pdev->dev, "%s\n", __func__); + + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "Can't enable device.\n"); + return err; + } + + err = pci_enable_msi(pdev); + if (err) + dev_info(&pdev->dev, "Enable msi failed\n"); + + /* Read gpio config data as pci device's platform data */ + gpio_data = dev_get_platdata(&pdev->dev); + if (!gpio_data) + dev_warn(&pdev->dev, "no gpio configuration\n"); + + dev_dbg(&pdev->dev, "%s, gpio_data = %p (%p)\n", __func__, + gpio_data, &gpio_data); + dev_dbg(&pdev->dev, "%s, pdev = %p (%p)\n", __func__, + pdev, &pdev); + + /* platform data is the pci device for all of them */ + for (i = 0; i < ARRAY_SIZE(sta2x11_mfd_bar0); i++) { + sta2x11_mfd_bar0[i].pdata_size = sizeof(pdev); + sta2x11_mfd_bar0[i].platform_data = &pdev; + } + sta2x11_mfd_bar1[0].pdata_size = sizeof(pdev); + sta2x11_mfd_bar1[0].platform_data = &pdev; + + /* Record this pdev before mfd_add_devices: their probe looks for it */ + sta2x11_mfd_add(pdev, GFP_ATOMIC); + + + err = mfd_add_devices(&pdev->dev, -1, + sta2x11_mfd_bar0, + ARRAY_SIZE(sta2x11_mfd_bar0), + &pdev->resource[0], + 0); + if (err) { + dev_err(&pdev->dev, "mfd_add_devices[0] failed: %d\n", err); + goto err_disable; + } + + err = mfd_add_devices(&pdev->dev, -1, + sta2x11_mfd_bar1, + ARRAY_SIZE(sta2x11_mfd_bar1), + &pdev->resource[1], + 0); + if (err) { + dev_err(&pdev->dev, "mfd_add_devices[1] failed: %d\n", err); + goto err_disable; + } + + return 0; + +err_disable: + mfd_remove_devices(&pdev->dev); + pci_disable_device(pdev); + pci_disable_msi(pdev); + return err; +} + +static DEFINE_PCI_DEVICE_TABLE(sta2x11_mfd_tbl) = { + {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)}, + {0,}, +}; + +static struct pci_driver sta2x11_mfd_driver = { + .name = "sta2x11-mfd", + .id_table = sta2x11_mfd_tbl, + .probe = sta2x11_mfd_probe, + .suspend = sta2x11_mfd_suspend, + .resume = sta2x11_mfd_resume, +}; + +static int __init sta2x11_mfd_init(void) +{ + pr_info("%s\n", __func__); + return pci_register_driver(&sta2x11_mfd_driver); +} + +/* + * All of this must be ready before "normal" devices like MMCI appear. + * But MFD (the pci device) can't be too early. The following choice + * prepares platform drivers very early and probe the PCI device later, + * but before other PCI devices. + */ +subsys_initcall(sta2x11_apbreg_init); +subsys_initcall(sta2x11_sctl_init); +rootfs_initcall(sta2x11_mfd_init); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Wind River"); +MODULE_DESCRIPTION("STA2x11 mfd for GPIO, SCTL and APBREG"); +MODULE_DEVICE_TABLE(pci, sta2x11_mfd_tbl); |
