linux-kernel - [PATCH 13/14] sta2x11-mfd : add sta2x11_mfd_get_regs

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Date:	Mon, 11 Jun 2012 02:57:58 +0200
From:	Davide Ciminaghi <dciminaghi@...l.gnudd.com>
To:	linux-kernel@...r.kernel.org
Cc:	sameo@...ux.intel.com, rubini@...dd.com,
	Davide Ciminaghi <ciminaghi@...dd.com>
Subject: [PATCH 13/14] sta2x11-mfd : add sta2x11_mfd_get_regs_data() function

From: Davide Ciminaghi <ciminaghi@...dd.com>

The common clock framework implementation needs to access
some of the sctl and apb-soc registers to configure, enable
and disable clocks.

In particular, 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@...dd.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 aca0bc7..9404988 100644
--- a/drivers/mfd/sta2x11-mfd.c
+++ b/drivers/mfd/sta2x11-mfd.c
@@ -129,6 +129,28 @@ u32 __sta2x11_mfd_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val,
 }
 EXPORT_SYMBOL(__sta2x11_mfd_mask);
 
+extern 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 85b2c20..9de20fd 100644
--- a/include/linux/mfd/sta2x11-mfd.h
+++ b/include/linux/mfd/sta2x11-mfd.h
@@ -481,4 +481,9 @@ 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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