[POWERPC] 4xx: Add 460EX PCIe support to 4xx pci driver

All this code is needed to properly initialize the 460EX PCIe host
bridge(s). We re-initialize all ports again, even though this has been done
in the bootloader (U-Boot) before. This way we make sure, that we always
run the latest init code in Linux and don't depend on code versions from
U-Boot.

Unfortunately all IBM/AMCC chips currently supported in this PCIe driver need
a different reset-/init-sequence.

Tested on AMCC Canyonlands eval board.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

2 files changed, 173 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/ppc4xx_pci.c b/arch/powerpc/sysdev/ppc4xx_pci.c
index 5abfcd157483..d183b8390ec3 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.c
+++ b/arch/powerpc/sysdev/ppc4xx_pci.c
@@ -527,6 +527,7 @@ static void __init ppc4xx_probe_pcix_bridge(struct device_node *np)
  *
  * ibm,plb-pciex-440spe
  * ibm,plb-pciex-405ex
+ * ibm,plb-pciex-460ex
  *
  * Anything else will be rejected for now as they are all subtly
  * different unfortunately.
@@ -775,6 +776,117 @@ static struct ppc4xx_pciex_hwops ppc440speB_pcie_hwops __initdata =
         .setup_utl      = ppc440speB_pciex_init_utl,
 };
 
+static int __init ppc460ex_pciex_core_init(struct device_node *np)
+{
+        /* Nothing to do, return 2 ports */
+        return 2;
+}
+
+static int ppc460ex_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
+{
+        u32 val;
+        u32 utlset1;
+
+        if (port->endpoint) {
+                val = PTYPE_LEGACY_ENDPOINT << 20;
+                utlset1 = 0x20222222;
+        } else {
+                val = PTYPE_ROOT_PORT << 20;
+                utlset1 = 0x21222222;
+        }
+
+        if (port->index == 0) {
+                val |= LNKW_X1 << 12;
+        } else {
+                val |= LNKW_X4 << 12;
+                utlset1 |= 0x00101101;
+        }
+
+        mtdcri(SDR0, port->sdr_base + PESDRn_DLPSET, val);
+        mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET1, utlset1);
+        mtdcri(SDR0, port->sdr_base + PESDRn_UTLSET2, 0x01210000);
+
+        switch (port->index) {
+        case 0:
+                mtdcri(SDR0, PESDR0_460EX_L0CDRCTL, 0x00003230);
+                mtdcri(SDR0, PESDR0_460EX_L0DRV, 0x00000136);
+                mtdcri(SDR0, PESDR0_460EX_L0CLK, 0x00000006);
+
+                mtdcri(SDR0, PESDR0_460EX_PHY_CTL_RST,0x10000000);
+                break;
+
+        case 1:
+                mtdcri(SDR0, PESDR1_460EX_L0CDRCTL, 0x00003230);
+                mtdcri(SDR0, PESDR1_460EX_L1CDRCTL, 0x00003230);
+                mtdcri(SDR0, PESDR1_460EX_L2CDRCTL, 0x00003230);
+                mtdcri(SDR0, PESDR1_460EX_L3CDRCTL, 0x00003230);
+                mtdcri(SDR0, PESDR1_460EX_L0DRV, 0x00000136);
+                mtdcri(SDR0, PESDR1_460EX_L1DRV, 0x00000136);
+                mtdcri(SDR0, PESDR1_460EX_L2DRV, 0x00000136);
+                mtdcri(SDR0, PESDR1_460EX_L3DRV, 0x00000136);
+                mtdcri(SDR0, PESDR1_460EX_L0CLK, 0x00000006);
+                mtdcri(SDR0, PESDR1_460EX_L1CLK, 0x00000006);
+                mtdcri(SDR0, PESDR1_460EX_L2CLK, 0x00000006);
+                mtdcri(SDR0, PESDR1_460EX_L3CLK, 0x00000006);
+
+                mtdcri(SDR0, PESDR1_460EX_PHY_CTL_RST,0x10000000);
+                break;
+        }
+
+        mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET,
+               mfdcri(SDR0, port->sdr_base + PESDRn_RCSSET) |
+               (PESDRx_RCSSET_RSTGU | PESDRx_RCSSET_RSTPYN));
+
+        /* Poll for PHY reset */
+        /* XXX FIXME add timeout */
+        switch (port->index) {
+        case 0:
+                while (!(mfdcri(SDR0, PESDR0_460EX_RSTSTA) & 0x1))
+                        udelay(10);
+                break;
+        case 1:
+                while (!(mfdcri(SDR0, PESDR1_460EX_RSTSTA) & 0x1))
+                        udelay(10);
+                break;
+        }
+
+        mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET,
+               (mfdcri(SDR0, port->sdr_base + PESDRn_RCSSET) &
+                ~(PESDRx_RCSSET_RSTGU | PESDRx_RCSSET_RSTDL)) |
+               PESDRx_RCSSET_RSTPYN);
+
+        port->has_ibpre = 1;
+
+        return 0;
+}
+
+static int ppc460ex_pciex_init_utl(struct ppc4xx_pciex_port *port)
+{
+        dcr_write(port->dcrs, DCRO_PEGPL_SPECIAL, 0x0);
+
+        /*
+         * Set buffer allocations and then assert VRB and TXE.
+         */
+        out_be32(port->utl_base + PEUTL_PBCTL,  0x0800000c);
+        out_be32(port->utl_base + PEUTL_OUTTR,  0x08000000);
+        out_be32(port->utl_base + PEUTL_INTR,   0x02000000);
+        out_be32(port->utl_base + PEUTL_OPDBSZ, 0x04000000);
+        out_be32(port->utl_base + PEUTL_PBBSZ,  0x00000000);
+        out_be32(port->utl_base + PEUTL_IPHBSZ, 0x02000000);
+        out_be32(port->utl_base + PEUTL_IPDBSZ, 0x04000000);
+        out_be32(port->utl_base + PEUTL_RCIRQEN,0x00f00000);
+        out_be32(port->utl_base + PEUTL_PCTL,   0x80800066);
+
+        return 0;
+}
+
+static struct ppc4xx_pciex_hwops ppc460ex_pcie_hwops __initdata =
+{
+        .core_init      = ppc460ex_pciex_core_init,
+        .port_init_hw   = ppc460ex_pciex_init_port_hw,
+        .setup_utl      = ppc460ex_pciex_init_utl,
+};
+
 #endif /* CONFIG_44x */
 
 #ifdef CONFIG_40x
@@ -896,6 +1008,8 @@ static int __init ppc4xx_pciex_check_core_init(struct device_node *np)
                 else
                         ppc4xx_pciex_hwops = &ppc440speB_pcie_hwops;
         }
+        if (of_device_is_compatible(np, "ibm,plb-pciex-460ex"))
+                ppc4xx_pciex_hwops = &ppc460ex_pcie_hwops;
 #endif /* CONFIG_44x    */
 #ifdef CONFIG_40x
         if (of_device_is_compatible(np, "ibm,plb-pciex-405ex"))
diff --git a/arch/powerpc/sysdev/ppc4xx_pci.h b/arch/powerpc/sysdev/ppc4xx_pci.h
index 1c07908dc6ef..d04e40b306fb 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.h
+++ b/arch/powerpc/sysdev/ppc4xx_pci.h
@@ -271,6 +271,59 @@
 #define PESDR1_405EX_PHYSTA             0x044C
 
 /*
+ * 460EX additional DCRs
+ */
+#define PESDR0_460EX_L0BIST             0x0308
+#define PESDR0_460EX_L0BISTSTS          0x0309
+#define PESDR0_460EX_L0CDRCTL           0x030A
+#define PESDR0_460EX_L0DRV              0x030B
+#define PESDR0_460EX_L0REC              0x030C
+#define PESDR0_460EX_L0LPB              0x030D
+#define PESDR0_460EX_L0CLK              0x030E
+#define PESDR0_460EX_PHY_CTL_RST        0x030F
+#define PESDR0_460EX_RSTSTA             0x0310
+#define PESDR0_460EX_OBS                0x0311
+#define PESDR0_460EX_L0ERRC             0x0320
+
+#define PESDR1_460EX_L0BIST             0x0348
+#define PESDR1_460EX_L1BIST             0x0349
+#define PESDR1_460EX_L2BIST             0x034A
+#define PESDR1_460EX_L3BIST             0x034B
+#define PESDR1_460EX_L0BISTSTS          0x034C
+#define PESDR1_460EX_L1BISTSTS          0x034D
+#define PESDR1_460EX_L2BISTSTS          0x034E
+#define PESDR1_460EX_L3BISTSTS          0x034F
+#define PESDR1_460EX_L0CDRCTL           0x0350
+#define PESDR1_460EX_L1CDRCTL           0x0351
+#define PESDR1_460EX_L2CDRCTL           0x0352
+#define PESDR1_460EX_L3CDRCTL           0x0353
+#define PESDR1_460EX_L0DRV              0x0354
+#define PESDR1_460EX_L1DRV              0x0355
+#define PESDR1_460EX_L2DRV              0x0356
+#define PESDR1_460EX_L3DRV              0x0357
+#define PESDR1_460EX_L0REC              0x0358
+#define PESDR1_460EX_L1REC              0x0359
+#define PESDR1_460EX_L2REC              0x035A
+#define PESDR1_460EX_L3REC              0x035B
+#define PESDR1_460EX_L0LPB              0x035C
+#define PESDR1_460EX_L1LPB              0x035D
+#define PESDR1_460EX_L2LPB              0x035E
+#define PESDR1_460EX_L3LPB              0x035F
+#define PESDR1_460EX_L0CLK              0x0360
+#define PESDR1_460EX_L1CLK              0x0361
+#define PESDR1_460EX_L2CLK              0x0362
+#define PESDR1_460EX_L3CLK              0x0363
+#define PESDR1_460EX_PHY_CTL_RST        0x0364
+#define PESDR1_460EX_RSTSTA             0x0365
+#define PESDR1_460EX_OBS                0x0366
+#define PESDR1_460EX_L0ERRC             0x0368
+#define PESDR1_460EX_L1ERRC             0x0369
+#define PESDR1_460EX_L2ERRC             0x036A
+#define PESDR1_460EX_L3ERRC             0x036B
+#define PESDR0_460EX_IHS1               0x036C
+#define PESDR0_460EX_IHS2               0x036D
+
+/*
  * Of the above, some are common offsets from the base
  */
 #define PESDRn_UTLSET1                  0x00
@@ -353,6 +406,12 @@
 #define PECFG_POM2LAL           0x390
 #define PECFG_POM2LAH           0x394
 
+/* SDR Bit Mappings */
+#define PESDRx_RCSSET_HLDPLB    0x10000000
+#define PESDRx_RCSSET_RSTGU     0x01000000
+#define PESDRx_RCSSET_RDY       0x00100000
+#define PESDRx_RCSSET_RSTDL     0x00010000
+#define PESDRx_RCSSET_RSTPYN    0x00001000
 
 enum
 {