From f5375a4500b2491f8315288dcaff3578e8b4c800 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= Date: Thu, 13 Apr 2023 22:41:45 +0200 Subject: [PATCH] pci: mpc85xx: Allow 8/16-bit access to PCI config space MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This Freescale mpc85xx PCI controller should support 8-bit and 16-bit read and write access to PCI config space as described in more Freescale reference manuals. This change fixes issue that 8-bit and 16-bit write to PCI config space caused to clear adjacent bits of 32-bit PCI register. Signed-off-by: Pali Rohár Reviewed-by: Heiko Schocher Tested-by: Heiko Schocher --- drivers/pci/pci_mpc85xx.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci_mpc85xx.c b/drivers/pci/pci_mpc85xx.c index 23f14db830..d144f2b791 100644 --- a/drivers/pci/pci_mpc85xx.c +++ b/drivers/pci/pci_mpc85xx.c @@ -25,7 +25,18 @@ static int mpc85xx_pci_dm_read_config(const struct udevice *dev, pci_dev_t bdf, addr = PCI_CONF1_EXT_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset); out_be32(priv->cfg_addr, addr); sync(); - *value = pci_conv_32_to_size(in_le32(priv->cfg_data), offset, size); + + switch (size) { + case PCI_SIZE_8: + *value = in_8(priv->cfg_data + (offset & 3)); + break; + case PCI_SIZE_16: + *value = in_le16(priv->cfg_data + (offset & 2)); + break; + case PCI_SIZE_32: + *value = in_le32(priv->cfg_data); + break; + } return 0; } @@ -40,7 +51,18 @@ static int mpc85xx_pci_dm_write_config(struct udevice *dev, pci_dev_t bdf, addr = PCI_CONF1_EXT_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset); out_be32(priv->cfg_addr, addr); sync(); - out_le32(priv->cfg_data, pci_conv_size_to_32(0, value, offset, size)); + + switch (size) { + case PCI_SIZE_8: + out_8(priv->cfg_data + (offset & 3), value); + break; + case PCI_SIZE_16: + out_le16(priv->cfg_data + (offset & 2), value); + break; + case PCI_SIZE_32: + out_le32(priv->cfg_data, value); + break; + } sync(); return 0;