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[ARM] orion/kirkwood: reset PCIe unit on boot

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Patch found in QNAPs vendor source package, with some cleanups
(proper defines, shortened max. timeout from 1s to 200ms).

Without this patch the PCIe SATA controller (Marvell 88sx7042/sata_mv)
in my QNAP TS-419P (Marvell 88f6281/Kirkwood) stops working after a
few minutes.

The symptomes are described in this thread:
http://marc.info/?l=linux-ide&m=124822863706181&w=2

[ Note: this is a workaround in need of a better analysis/solution -- NP ]

Acked-by: Saeed Bishara <saeed@marvell.com>
Tested-by: Bernhard R. Link <brl@pcpool00.mathematik.uni-freiburg.de>
Seconded-by: Martin Michlmayr <tbm@cyrius.com>
I'm_not_very_happy_with_it-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
This commit is contained in:
Olaf Rempel 2010-06-08 22:32:38 +02:00 committed by Nicolas Pitre
parent 6f2b186a0f
commit 21f0ba90a4
1 changed files with 34 additions and 0 deletions
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34
arch/arm/plat-orion/pcie.c
View file

@ -13,6 +13,7 @@
#include <linux/mbus.h>
#include <asm/mach/pci.h>
#include <plat/pcie.h>
#include <linux/delay.h>
/*
* PCIe unit register offsets.
@ -46,6 +47,8 @@
#define PCIE_STAT_BUS_OFFS 8
#define PCIE_STAT_BUS_MASK 0xff
#define PCIE_STAT_LINK_DOWN 1
#define PCIE_DEBUG_CTRL 0x1a60
#define PCIE_DEBUG_SOFT_RESET (1<<20)
u32 __init orion_pcie_dev_id(void __iomem *base)
@ -85,6 +88,32 @@ void __init orion_pcie_set_local_bus_nr(void __iomem *base, int nr)
writel(stat, base + PCIE_STAT_OFF);
}
void __init orion_pcie_reset(void __iomem *base)
{
u32 reg;
int i;
/*
* MV-S104860-U0, Rev. C:
* PCI Express Unit Soft Reset
* When set, generates an internal reset in the PCI Express unit.
* This bit should be cleared after the link is re-established.
*/
reg = readl(base + PCIE_DEBUG_CTRL);
reg |= PCIE_DEBUG_SOFT_RESET;
writel(reg, base + PCIE_DEBUG_CTRL);
for (i = 0; i < 20; i++) {
mdelay(10);
if (orion_pcie_link_up(base))
break;
}
reg &= ~(PCIE_DEBUG_SOFT_RESET);
writel(reg, base + PCIE_DEBUG_CTRL);
}
/*
* Setup PCIE BARs and Address Decode Wins:
* BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
@ -152,6 +181,11 @@ void __init orion_pcie_setup(void __iomem *base,
u16 cmd;
u32 mask;
/*
* soft reset PCIe unit
*/
orion_pcie_reset(base);
/*
* Point PCIe unit MBUS decode windows to DRAM space.
*/