468 lines
12 KiB
C
468 lines
12 KiB
C
/*
|
|
* 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);
|