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sh: Support type 1 accesses for SH7786 PCI.

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This enables support for type 1 config space accesses on the SH7786
PCI controller. At the same time, add in some extra sanity checks for
controller asserted errors.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-08-20 15:59:40 +09:00
parent 97e0214044
commit 7656e2486c
1 changed files with 21 additions and 7 deletions
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28
arch/sh/drivers/pci/ops-sh7786.c
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@ -1,7 +1,7 @@
/*
* Generic SH7786 PCI-Express operations.
*
* Copyright (C) 2009 Paul Mundt
* Copyright (C) 2009 - 2010 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License v2. See the file "COPYING" in the main directory of this archive
@ -35,22 +35,34 @@ static int sh7786_pcie_config_access(unsigned char access_type,
if (devfn)
return PCIBIOS_DEVICE_NOT_FOUND;
/* Clear errors */
pci_write_reg(chan, pci_read_reg(chan, SH4A_PCIEERRFR), SH4A_PCIEERRFR);
/* Set the PIO address */
pci_write_reg(chan, (bus->number << 24) | (dev << 19) |
(func << 16) | (where & ~3), SH4A_PCIEPAR);
/* Enable the configuration access */
pci_write_reg(chan, (1 << 31), SH4A_PCIEPCTLR);
if (bus->number) {
/* Type 1 */
pci_write_reg(chan, (1 << 31) | (1 << 8), SH4A_PCIEPCTLR);
} else {
/* Type 0 */
pci_write_reg(chan, (1 << 31), SH4A_PCIEPCTLR);
}
/* Check for errors */
if (pci_read_reg(chan, SH4A_PCIEERRFR) & 0x10)
return PCIBIOS_DEVICE_NOT_FOUND;
/* Check for master and target aborts */
if (pci_read_reg(chan, SH4A_PCIEPCICONF1) & ((1 << 29) | (1 << 28)))
return PCIBIOS_DEVICE_NOT_FOUND;
if (access_type == PCI_ACCESS_READ)
*data = pci_read_reg(chan, SH4A_PCIEPDR);
else
pci_write_reg(chan, *data, SH4A_PCIEPDR);
/* Check for master and target aborts */
if (pci_read_reg(chan, SH4A_PCIEPCICONF1) & ((1 << 29) | (1 << 28)))
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
@ -69,8 +81,10 @@ static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,
spin_lock_irqsave(&sh7786_pcie_lock, flags);
ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,
devfn, where, &data);
if (ret != PCIBIOS_SUCCESSFUL)
if (ret != PCIBIOS_SUCCESSFUL) {
*val = 0xffffffff;
goto out;
}
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;