linux-kernel - [PATCH 3/3] arch/x86/pci/sta2x11-fixup.c: reset and enable STA2X11 MediaLB clock

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Message-ID: <0c15eefb893b10a37290e9e832bfd07cb94341b3.1370856733.git.asnaghi@st.com>
Date:	Mon, 10 Jun 2013 14:52:46 +0200
From:	Giancarlo Asnaghi <giancarlo.asnaghi@...com>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Alessandro Rubini <rubini@...dd.com>,
	Federico Vaga <federico.vaga@...il.com>
Subject: [PATCH 3/3] arch/x86/pci/sta2x11-fixup.c: reset and enable STA2X11
 MediaLB clock

The MediaLB peripheral, devoted to the MOST protocol, must be reset
using chipset registers, so this code is not part of the MLB PCI
driver.

Signed-off-by: Giancarlo Asnaghi <giancarlo.asnaghi@...com>
Signed-off-by: Federico Vaga <federico.vaga@...il.com>
---
 arch/x86/pci/sta2x11-fixup.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 9d8a509..3eae9ab 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c
@@ -26,6 +26,9 @@
 #include <linux/pci_ids.h>
 #include <linux/export.h>
 #include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/mfd/sta2x11-mfd.h>
+#include <asm/sta2x11.h>
 
 #define STA2X11_SWIOTLB_SIZE (4*1024*1024)
 extern int swiotlb_late_init_with_default_size(size_t default_size);
@@ -212,6 +215,20 @@ static void sta2x11_setup_pdev(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, PCI_ANY_ID, sta2x11_setup_pdev);
 
+static void sta2x11_most_enable(struct pci_dev *pdev)
+{
+	/* trying to reset the MLB */
+	sta2x11_apbreg_mask(pdev, APBREG_PCG, APBREG_MLB, 0);
+	sta2x11_apbreg_mask(pdev, APBREG_PUR, APBREG_MLB, 0);
+	msleep_interruptible(100);
+
+	/* Config clock and release device from reset */
+	sta2x11_apbreg_mask(pdev, APBREG_PCG, APBREG_MLB, APBREG_MLB);
+	sta2x11_apbreg_mask(pdev, APBREG_PUR, APBREG_MLB, APBREG_MLB);
+	msleep_interruptible(100);
+}
+DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_STMICRO, 0xcc12, sta2x11_most_enable);
+
 /*
  * The following three functions are exported (used in swiotlb: FIXME)
  */
-- 
1.7.7.2
--
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