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linux/drivers/mfd/sta2x11-mfd.c
Alessandro Rubini 35bdd29095 mfd: Add driver for STA2X11 MFD block 
This also introduces <asm/sta2x11.h> to export a function that is in
the base sta2x11 support patches. The header will increase with other
prototypes and constants over time.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@st.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-05-09 15:34:28 +02:00

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/*
* 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);
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