From: Ley Foon Tan <ley.foon.tan@intel.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
lftan.linux@gmail.com, Ley Foon Tan <ley.foon.tan@intel.com>
Subject: [PATCH v2] PCI: altera: Fix configuration type based on secondary number
Date: Wed, 12 Jun 2019 14:42:00 +0800 [thread overview]
Message-ID: <1560321720-4083-1-git-send-email-ley.foon.tan@intel.com> (raw)
This fix issue when access config from PCIe switch.
Stratix 10 PCIe controller does not support Type 1 to Type 0 conversion
as previous version (V1) does.
The PCIe controller need to send Type 0 config TLP if the targeting bus
matches with the secondary bus number, which is when the TLP is targeting
the immediate device on the link.
The PCIe controller send Type 1 config TLP if the targeting bus is
larger than the secondary bus, which is when the TLP is targeting the
device not immediate on the link.
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
---
v2:
- Add get_tlp_header() function.
---
drivers/pci/controller/pcie-altera.c | 41 ++++++++++++++++++----------
1 file changed, 27 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
index 27222071ace7..d2497ca43828 100644
--- a/drivers/pci/controller/pcie-altera.c
+++ b/drivers/pci/controller/pcie-altera.c
@@ -44,6 +44,8 @@
#define S10_RP_RXCPL_STATUS 0x200C
#define S10_RP_CFG_ADDR(pcie, reg) \
(((pcie)->hip_base) + (reg) + (1 << 20))
+#define S10_RP_SECONDARY(pcie) \
+ readb(S10_RP_CFG_ADDR(pcie, PCI_SECONDARY_BUS))
/* TLP configuration type 0 and 1 */
#define TLP_FMTTYPE_CFGRD0 0x04 /* Configuration Read Type 0 */
@@ -55,14 +57,9 @@
#define TLP_WRITE_TAG 0x10
#define RP_DEVFN 0
#define TLP_REQ_ID(bus, devfn) (((bus) << 8) | (devfn))
-#define TLP_CFGRD_DW0(pcie, bus) \
- ((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgrd0 \
- : pcie->pcie_data->cfgrd1) << 24) | \
- TLP_PAYLOAD_SIZE)
-#define TLP_CFGWR_DW0(pcie, bus) \
- ((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgwr0 \
- : pcie->pcie_data->cfgwr1) << 24) | \
- TLP_PAYLOAD_SIZE)
+#define TLP_CFG_DW0(pcie, cfg) \
+ (((cfg) << 24) | \
+ TLP_PAYLOAD_SIZE)
#define TLP_CFG_DW1(pcie, tag, be) \
(((TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN)) << 16) | (tag << 8) | (be))
#define TLP_CFG_DW2(bus, devfn, offset) \
@@ -322,14 +319,31 @@ static void s10_tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
s10_tlp_write_tx(pcie, data, RP_TX_EOP);
}
+static void get_tlp_header(struct altera_pcie *pcie, u8 bus, u32 devfn,
+ int where, u8 byte_en, bool read, u32 *headers)
+{
+ u8 cfg;
+ u8 cfg0 = read ? pcie->pcie_data->cfgrd0 : pcie->pcie_data->cfgwr0;
+ u8 cfg1 = read ? pcie->pcie_data->cfgrd1 : pcie->pcie_data->cfgwr1;
+ u8 tag = read ? TLP_READ_TAG : TLP_WRITE_TAG;
+
+ if (pcie->pcie_data->version == ALTERA_PCIE_V1)
+ cfg = (bus == pcie->root_bus_nr) ? cfg0 : cfg1;
+ else
+ cfg = (bus > S10_RP_SECONDARY(pcie)) ? cfg0 : cfg1;
+
+ headers[0] = TLP_CFG_DW0(pcie, cfg);
+ headers[1] = TLP_CFG_DW1(pcie, tag, byte_en);
+ headers[2] = TLP_CFG_DW2(bus, devfn, where);
+}
+
static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
int where, u8 byte_en, u32 *value)
{
u32 headers[TLP_HDR_SIZE];
- headers[0] = TLP_CFGRD_DW0(pcie, bus);
- headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
- headers[2] = TLP_CFG_DW2(bus, devfn, where);
+ get_tlp_header(pcie, bus, devfn, where, byte_en, true,
+ headers);
pcie->pcie_data->ops->tlp_write_pkt(pcie, headers, 0, false);
@@ -342,9 +356,8 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
u32 headers[TLP_HDR_SIZE];
int ret;
- headers[0] = TLP_CFGWR_DW0(pcie, bus);
- headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en);
- headers[2] = TLP_CFG_DW2(bus, devfn, where);
+ get_tlp_header(pcie, bus, devfn, where, byte_en, false,
+ headers);
/* check alignment to Qword */
if ((where & 0x7) == 0)
--
2.19.0
next reply other threads:[~2019-06-12 6:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 6:42 Ley Foon Tan [this message]
2019-06-17 11:29 ` [PATCH v2] PCI: altera: Fix configuration type based on secondary number Lorenzo Pieralisi
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