From 39f3275077a5b143616fcb3e7a6457a5c42739ee Mon Sep 17 00:00:00 2001 From: Gabor Juhos Date: Wed, 14 Mar 2012 10:36:04 +0100 Subject: [PATCH 13/47] MIPS: ath79: fix broken ar724x_pci_{read,write} functions The current ar724x_pci_{read,write} functions are broken. Due to that, pci_read_config_byte returns with bogus values, and pci_write_config_{byte,word} unconditionally clears the accessed PCI configuration registers instead of changing the value of them. The patch fixes the broken functions, thus the PCI configuration space can be accessed correctly. Signed-off-by: Gabor Juhos Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3493/ Signed-off-by: Ralf Baechle --- arch/mips/pci/pci-ar724x.c | 52 ++++++++++++++++++++++---------------------- 1 files changed, 26 insertions(+), 26 deletions(-) --- a/arch/mips/pci/pci-ar724x.c +++ b/arch/mips/pci/pci-ar724x.c @@ -22,8 +22,9 @@ static void __iomem *ar724x_pci_devcfg_b static int ar724x_pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, uint32_t *value) { - unsigned long flags, addr, tval, mask; + unsigned long flags; void __iomem *base; + u32 data; if (devfn) return PCIBIOS_DEVICE_NOT_FOUND; @@ -31,24 +32,22 @@ static int ar724x_pci_read(struct pci_bu base = ar724x_pci_devcfg_base; spin_lock_irqsave(&ar724x_pci_lock, flags); + data = __raw_readl(base + (where & ~3)); switch (size) { case 1: - addr = where & ~3; - mask = 0xff000000 >> ((where % 4) * 8); - tval = __raw_readl(base + addr); - tval = tval & ~mask; - *value = (tval >> ((4 - (where % 4))*8)); + if (where & 1) + data >>= 8; + if (where & 2) + data >>= 16; + data &= 0xff; break; case 2: - addr = where & ~3; - mask = 0xffff0000 >> ((where % 4)*8); - tval = __raw_readl(base + addr); - tval = tval & ~mask; - *value = (tval >> ((4 - (where % 4))*8)); + if (where & 2) + data >>= 16; + data &= 0xffff; break; case 4: - *value = __raw_readl(base + where); break; default: spin_unlock_irqrestore(&ar724x_pci_lock, flags); @@ -57,6 +56,7 @@ static int ar724x_pci_read(struct pci_bu } spin_unlock_irqrestore(&ar724x_pci_lock, flags); + *value = data; return PCIBIOS_SUCCESSFUL; } @@ -64,8 +64,10 @@ static int ar724x_pci_read(struct pci_bu static int ar724x_pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, uint32_t value) { - unsigned long flags, tval, addr, mask; + unsigned long flags; void __iomem *base; + u32 data; + int s; if (devfn) return PCIBIOS_DEVICE_NOT_FOUND; @@ -73,26 +75,21 @@ static int ar724x_pci_write(struct pci_b base = ar724x_pci_devcfg_base; spin_lock_irqsave(&ar724x_pci_lock, flags); + data = __raw_readl(base + (where & ~3)); switch (size) { case 1: - addr = where & ~3; - mask = 0xff000000 >> ((where % 4)*8); - tval = __raw_readl(base + addr); - tval = tval & ~mask; - tval |= (value << ((4 - (where % 4))*8)) & mask; - __raw_writel(tval, base + addr); + s = ((where & 3) * 8); + data &= ~(0xff << s); + data |= ((value & 0xff) << s); break; case 2: - addr = where & ~3; - mask = 0xffff0000 >> ((where % 4)*8); - tval = __raw_readl(base + addr); - tval = tval & ~mask; - tval |= (value << ((4 - (where % 4))*8)) & mask; - __raw_writel(tval, base + addr); + s = ((where & 2) * 8); + data &= ~(0xffff << s); + data |= ((value & 0xffff) << s); break; case 4: - __raw_writel(value, (base + where)); + data = value; break; default: spin_unlock_irqrestore(&ar724x_pci_lock, flags); @@ -100,6 +97,9 @@ static int ar724x_pci_write(struct pci_b return PCIBIOS_BAD_REGISTER_NUMBER; } + __raw_writel(data, base + (where & ~3)); + /* flush write */ + __raw_readl(base + (where & ~3)); spin_unlock_irqrestore(&ar724x_pci_lock, flags); return PCIBIOS_SUCCESSFUL;