powerpc/44x: Adding PCI-E support for PowerPC 460SX based SOC.

Add support for PCI-e on the AMCC 460SX boards

Signed-off-by: Tirumala Marri <tmarri@amcc.com>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

2 files changed, 177 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/ppc4xx_pci.c b/arch/powerpc/sysdev/ppc4xx_pci.c
index 106d767bf65b..156aa7d36258 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.c
+++ b/arch/powerpc/sysdev/ppc4xx_pci.c
@@ -974,6 +974,123 @@ static struct ppc4xx_pciex_hwops ppc460ex_pcie_hwops __initdata =
         .setup_utl      = ppc460ex_pciex_init_utl,
 };
 
+static int __init ppc460sx_pciex_core_init(struct device_node *np)
+{
+        /* HSS drive amplitude */
+        mtdcri(SDR0, PESDR0_460SX_HSSL0DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL1DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL2DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL3DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL4DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL5DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL6DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR0_460SX_HSSL7DAMP, 0xB9843211);
+
+        mtdcri(SDR0, PESDR1_460SX_HSSL0DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR1_460SX_HSSL1DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR1_460SX_HSSL2DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR1_460SX_HSSL3DAMP, 0xB9843211);
+
+        mtdcri(SDR0, PESDR2_460SX_HSSL0DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR2_460SX_HSSL1DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR2_460SX_HSSL2DAMP, 0xB9843211);
+        mtdcri(SDR0, PESDR2_460SX_HSSL3DAMP, 0xB9843211);
+
+        /* HSS TX pre-emphasis */
+        mtdcri(SDR0, PESDR0_460SX_HSSL0COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL1COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL2COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL3COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL4COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL5COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL6COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR0_460SX_HSSL7COEFA, 0xDCB98987);
+
+        mtdcri(SDR0, PESDR1_460SX_HSSL0COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR1_460SX_HSSL1COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR1_460SX_HSSL2COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR1_460SX_HSSL3COEFA, 0xDCB98987);
+
+        mtdcri(SDR0, PESDR2_460SX_HSSL0COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR2_460SX_HSSL1COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR2_460SX_HSSL2COEFA, 0xDCB98987);
+        mtdcri(SDR0, PESDR2_460SX_HSSL3COEFA, 0xDCB98987);
+
+        /* HSS TX calibration control */
+        mtdcri(SDR0, PESDR0_460SX_HSSL1CALDRV, 0x22222222);
+        mtdcri(SDR0, PESDR1_460SX_HSSL1CALDRV, 0x22220000);
+        mtdcri(SDR0, PESDR2_460SX_HSSL1CALDRV, 0x22220000);
+
+        /* HSS TX slew control */
+        mtdcri(SDR0, PESDR0_460SX_HSSSLEW, 0xFFFFFFFF);
+        mtdcri(SDR0, PESDR1_460SX_HSSSLEW, 0xFFFF0000);
+        mtdcri(SDR0, PESDR2_460SX_HSSSLEW, 0xFFFF0000);
+
+        udelay(100);
+
+        /* De-assert PLLRESET */
+        dcri_clrset(SDR0, PESDR0_PLLLCT2, 0x00000100, 0);
+
+        /* Reset DL, UTL, GPL before configuration */
+        mtdcri(SDR0, PESDR0_460SX_RCSSET,
+                        PESDRx_RCSSET_RSTDL | PESDRx_RCSSET_RSTGU);
+        mtdcri(SDR0, PESDR1_460SX_RCSSET,
+                        PESDRx_RCSSET_RSTDL | PESDRx_RCSSET_RSTGU);
+        mtdcri(SDR0, PESDR2_460SX_RCSSET,
+                        PESDRx_RCSSET_RSTDL | PESDRx_RCSSET_RSTGU);
+
+        udelay(100);
+
+        /*
+         * If bifurcation is not enabled, u-boot would have disabled the
+         * third PCIe port
+         */
+        if (((mfdcri(SDR0, PESDR1_460SX_HSSCTLSET) & 0x00000001) ==
+                                0x00000001)) {
+                printk(KERN_INFO "PCI: PCIE bifurcation setup successfully.\n");
+                printk(KERN_INFO "PCI: Total 3 PCIE ports are present\n");
+                return 3;
+        }
+
+        printk(KERN_INFO "PCI: Total 2 PCIE ports are present\n");
+        return 2;
+}
+
+static int ppc460sx_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
+{
+
+        if (port->endpoint)
+                dcri_clrset(SDR0, port->sdr_base + PESDRn_UTLSET2,
+                                0x01000000, 0);
+        else
+                dcri_clrset(SDR0, port->sdr_base + PESDRn_UTLSET2,
+                                0, 0x01000000);
+
+        /*Gen-1*/
+        mtdcri(SDR0, port->sdr_base + PESDRn_460SX_RCEI, 0x08000000);
+
+        dcri_clrset(SDR0, port->sdr_base + PESDRn_RCSSET,
+                        (PESDRx_RCSSET_RSTGU | PESDRx_RCSSET_RSTDL),
+                        PESDRx_RCSSET_RSTPYN);
+
+        port->has_ibpre = 1;
+
+        return 0;
+}
+
+static int ppc460sx_pciex_init_utl(struct ppc4xx_pciex_port *port)
+{
+        /* Max 128 Bytes */
+        out_be32 (port->utl_base + PEUTL_PBBSZ,   0x00000000);
+        return 0;
+}
+
+static struct ppc4xx_pciex_hwops ppc460sx_pcie_hwops __initdata = {
+        .core_init      = ppc460sx_pciex_core_init,
+        .port_init_hw   = ppc460sx_pciex_init_port_hw,
+        .setup_utl      = ppc460sx_pciex_init_utl,
+};
+
 #endif /* CONFIG_44x */
 
 #ifdef CONFIG_40x
@@ -1089,6 +1206,8 @@ static int __init ppc4xx_pciex_check_core_init(struct device_node *np)
         }
         if (of_device_is_compatible(np, "ibm,plb-pciex-460ex"))
                 ppc4xx_pciex_hwops = &ppc460ex_pcie_hwops;
+        if (of_device_is_compatible(np, "ibm,plb-pciex-460sx"))
+                ppc4xx_pciex_hwops = &ppc460sx_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 d04e40b306fb..56d9e5deccbf 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.h
+++ b/arch/powerpc/sysdev/ppc4xx_pci.h
@@ -324,6 +324,64 @@
 #define PESDR0_460EX_IHS2               0x036D
 
 /*
+ * 460SX addtional DCRs
+ */
+#define PESDRn_460SX_RCEI               0x02
+
+#define PESDR0_460SX_HSSL0DAMP          0x320
+#define PESDR0_460SX_HSSL1DAMP          0x321
+#define PESDR0_460SX_HSSL2DAMP          0x322
+#define PESDR0_460SX_HSSL3DAMP          0x323
+#define PESDR0_460SX_HSSL4DAMP          0x324
+#define PESDR0_460SX_HSSL5DAMP          0x325
+#define PESDR0_460SX_HSSL6DAMP          0x326
+#define PESDR0_460SX_HSSL7DAMP          0x327
+
+#define PESDR1_460SX_HSSL0DAMP          0x354
+#define PESDR1_460SX_HSSL1DAMP          0x355
+#define PESDR1_460SX_HSSL2DAMP          0x356
+#define PESDR1_460SX_HSSL3DAMP          0x357
+
+#define PESDR2_460SX_HSSL0DAMP          0x384
+#define PESDR2_460SX_HSSL1DAMP          0x385
+#define PESDR2_460SX_HSSL2DAMP          0x386
+#define PESDR2_460SX_HSSL3DAMP          0x387
+
+#define PESDR0_460SX_HSSL0COEFA         0x328
+#define PESDR0_460SX_HSSL1COEFA         0x329
+#define PESDR0_460SX_HSSL2COEFA         0x32A
+#define PESDR0_460SX_HSSL3COEFA         0x32B
+#define PESDR0_460SX_HSSL4COEFA         0x32C
+#define PESDR0_460SX_HSSL5COEFA         0x32D
+#define PESDR0_460SX_HSSL6COEFA         0x32E
+#define PESDR0_460SX_HSSL7COEFA         0x32F
+
+#define PESDR1_460SX_HSSL0COEFA         0x358
+#define PESDR1_460SX_HSSL1COEFA         0x359
+#define PESDR1_460SX_HSSL2COEFA         0x35A
+#define PESDR1_460SX_HSSL3COEFA         0x35B
+
+#define PESDR2_460SX_HSSL0COEFA         0x388
+#define PESDR2_460SX_HSSL1COEFA         0x389
+#define PESDR2_460SX_HSSL2COEFA         0x38A
+#define PESDR2_460SX_HSSL3COEFA         0x38B
+
+#define PESDR0_460SX_HSSL1CALDRV        0x339
+#define PESDR1_460SX_HSSL1CALDRV        0x361
+#define PESDR2_460SX_HSSL1CALDRV        0x391
+
+#define PESDR0_460SX_HSSSLEW            0x338
+#define PESDR1_460SX_HSSSLEW            0x360
+#define PESDR2_460SX_HSSSLEW            0x390
+
+#define PESDR0_460SX_HSSCTLSET          0x31E
+#define PESDR1_460SX_HSSCTLSET          0x352
+#define PESDR2_460SX_HSSCTLSET          0x382
+
+#define PESDR0_460SX_RCSSET             0x304
+#define PESDR1_460SX_RCSSET             0x344
+#define PESDR2_460SX_RCSSET             0x374
+/*
  * Of the above, some are common offsets from the base
  */
 #define PESDRn_UTLSET1                  0x00