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Subject[PATCH 2/8] sta2x11-mfd : add sta2x11_mfd_get_regs_data() function
Date
From: Davide Ciminaghi <ciminaghi@gnudd.com>

A couple of predefined clocks (mux and gated) need to be
initialized with the virtual address of the clock's controlling
register and the address of a spinlock used to protect against
races.
This function exports such data for all the mfd cells.

Signed-off-by: Davide Ciminaghi <ciminaghi@gnudd.com>
---
drivers/mfd/sta2x11-mfd.c | 22 ++++++++++++++++++++++
include/linux/mfd/sta2x11-mfd.h | 5 +++++
2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/sta2x11-mfd.c b/drivers/mfd/sta2x11-mfd.c
index 5fbd044..905b184 100644
--- a/drivers/mfd/sta2x11-mfd.c
+++ b/drivers/mfd/sta2x11-mfd.c
@@ -127,6 +127,28 @@ u32 __sta2x11_mfd_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val,
}
EXPORT_SYMBOL(__sta2x11_mfd_mask);

+int sta2x11_mfd_get_regs_data(struct platform_device *dev,
+ enum sta2x11_mfd_plat_dev index,
+ void __iomem **regs,
+ spinlock_t **lock)
+{
+ struct pci_dev *pdev = *(struct pci_dev **)(dev->dev.platform_data);
+ struct sta2x11_mfd *mfd;
+
+ if (!pdev)
+ return -ENODEV;
+ mfd = sta2x11_mfd_find(pdev);
+ if (!mfd)
+ return -ENODEV;
+ if (index >= sta2x11_n_mfd_plat_devs)
+ return -ENODEV;
+ *regs = mfd->regs[index];
+ *lock = &mfd->lock[index];
+ pr_debug("%s %d *regs = %p\n", __func__, __LINE__, *regs);
+ return *regs ? 0 : -ENODEV;
+}
+EXPORT_SYMBOL(sta2x11_mfd_get_regs_data);
+
/* 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[] = {
diff --git a/include/linux/mfd/sta2x11-mfd.h b/include/linux/mfd/sta2x11-mfd.h
index 4d85879..9ba6127 100644
--- a/include/linux/mfd/sta2x11-mfd.h
+++ b/include/linux/mfd/sta2x11-mfd.h
@@ -473,4 +473,9 @@ u32 sta2x11_apb_soc_regs_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val)
#define COMPENSATION_REG3 0x3cc
#define TEST_CTL_REG 0x3d0

+extern int sta2x11_mfd_get_regs_data(struct platform_device *pdev,
+ enum sta2x11_mfd_plat_dev index,
+ void __iomem **regs,
+ spinlock_t **lock);
+
#endif /* __STA2X11_MFD_H */
--
1.7.9.1


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