[U-Boot] [PATCHv4 08/12] pci: ls_pcie_g4: add Workaround for A-011577

[Z.q. Hou]

Hi All,

Please ignore this patch, rev1.0 will not be production.

Thanks,
Zhiqiang


> -----Original Message-----
> From: Z.q. Hou
> Sent: 2019年3月11日 10:58
> To: u-boot at lists.denx.de; bmeng.cn at gmail.com; albert.u.boot at aribaud.net;
> Priyanka Jain <priyanka.jain at nxp.com>; York Sun <york.sun at nxp.com>;
> sriram.dash at nxp.com; yamada.masahiro at socionext.com; Prabhakar
> Kushwaha <prabhakar.kushwaha at nxp.com>; Mingkai Hu
> <mingkai.hu at nxp.com>; M.h. Lian <minghuan.lian at nxp.com>
> Cc: Z.q. Hou <zhiqiang.hou at nxp.com>
> Subject: [PATCHv4 08/12] pci: ls_pcie_g4: add Workaround for A-011577
> 
> From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
> 
> PCIe configuration access to non-existent function triggered SERROR interrupt
> exception.
> 
> Workaround:
> Disable error reporting on AXI bus during the Vendor ID read transactions in
> enumeration.
> 
> This ERRATA is only for LX2160A Rev1.0 and will be fixed in Rev2.0.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
> ---
> V4:
>  - No change
> 
>  drivers/pci/pcie_layerscape_gen4.c | 8 ++++++++
> drivers/pci/pcie_layerscape_gen4.h | 5 +++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/pci/pcie_layerscape_gen4.c
> b/drivers/pci/pcie_layerscape_gen4.c
> index 4e0d5b168e..799da2f7df 100644
> --- a/drivers/pci/pcie_layerscape_gen4.c
> +++ b/drivers/pci/pcie_layerscape_gen4.c
> @@ -242,6 +242,9 @@ static int ls_pcie_g4_read_config(struct udevice *bus,
> pci_dev_t bdf,
> 
>  	address = ls_pcie_g4_conf_address(pcie, bdf, offset);
> 
> +	if (pcie->rev == REV_1_0 && offset == PCI_VENDOR_ID)
> +		lut_writel(pcie, 0x0 << PCIE_LUT_GCR_RRE, PCIE_LUT_GCR);
> +
>  	switch (size) {
>  	case PCI_SIZE_8:
>  		*valuep = readb(address);
> @@ -257,6 +260,9 @@ static int ls_pcie_g4_read_config(struct udevice *bus,
> pci_dev_t bdf,
>  		break;
>  	}
> 
> +	if (pcie->rev == REV_1_0 && offset == PCI_VENDOR_ID)
> +		lut_writel(pcie, 0x1 << PCIE_LUT_GCR_RRE, PCIE_LUT_GCR);
> +
>  	return ret;
>  }
> 
> @@ -518,6 +524,8 @@ static int ls_pcie_g4_probe(struct udevice *dev)
>  	      dev->name, (unsigned long)pcie->ccsr, (unsigned long)pcie->cfg,
>  	      pcie->big_endian);
> 
> +	pcie->rev = readb(pcie->ccsr + PCI_REVISION_ID);
> +
>  	pcie->mode = readb(pcie->ccsr + PCI_HEADER_TYPE) & 0x7f;
> 
>  	if (pcie->mode == PCI_HEADER_TYPE_NORMAL) { diff --git
> a/drivers/pci/pcie_layerscape_gen4.h b/drivers/pci/pcie_layerscape_gen4.h
> index 356b49f9ce..137768cae7 100644
> --- a/drivers/pci/pcie_layerscape_gen4.h
> +++ b/drivers/pci/pcie_layerscape_gen4.h
> @@ -11,6 +11,8 @@
>  #include <pci.h>
>  #include <dm.h>
> 
> +#define REV_1_0					(0x10)
> +
>  #ifndef CONFIG_SYS_PCI_MEMORY_SIZE
>  #define CONFIG_SYS_PCI_MEMORY_SIZE		(4 * 1024 * 1024 * 1024ULL)
>  #endif
> @@ -161,6 +163,8 @@
>  #define PCIE_LUT_LDR(n)				(0x804 + (n) * 8)
>  #define PCIE_LUT_ENABLE				BIT(31)
>  #define PCIE_LUT_ENTRY_COUNT			32
> +#define PCIE_LUT_GCR				(0x28)
> +#define PCIE_LUT_GCR_RRE			(0)
> 
>  /* PF control registers */
>  #define PCIE_LTSSM_STA				0x7fc
> @@ -190,6 +194,7 @@ struct ls_pcie_g4 {
>  	int stream_id_cur;
>  	int mode;
>  	int sriov_support;
> +	u8 rev;
>  };
> 
>  extern struct list_head ls_pcie_g4_list;
> --
> 2.17.1