MIPS: BCM63XX: Add PCIe Support for BCM6328

Add support for the PCIe port found on BCM6328.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Maxime Bizon <mbizon@freebox.fr>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/3956/
Reviewed-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

7 files changed, 248 insertions, 0 deletions

diff --git a/arch/mips/bcm63xx/Kconfig b/arch/mips/bcm63xx/Kconfig
index 09e93cab37b5..d03e8799d1cf 100644
--- a/arch/mips/bcm63xx/Kconfig
+++ b/arch/mips/bcm63xx/Kconfig
@@ -3,6 +3,7 @@ menu "CPU support"
 
 config BCM63XX_CPU_6328
         bool "support 6328 CPU"
+        select HW_HAS_PCI
 
 config BCM63XX_CPU_6338
         bool "support 6338 CPU"
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
index b842b6d2ba5e..e104ddb694a8 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
@@ -122,6 +122,7 @@ enum bcm63xx_regs_set {
         RSET_USBH_PRIV,
         RSET_MPI,
         RSET_PCMCIA,
+        RSET_PCIE,
         RSET_DSL,
         RSET_ENET0,
         RSET_ENET1,
@@ -188,6 +189,7 @@ enum bcm63xx_regs_set {
 #define BCM_6328_USBH_PRIV_BASE         (0xdeadbeef)
 #define BCM_6328_MPI_BASE               (0xdeadbeef)
 #define BCM_6328_PCMCIA_BASE            (0xdeadbeef)
+#define BCM_6328_PCIE_BASE              (0xb0e40000)
 #define BCM_6328_SDRAM_REGS_BASE        (0xdeadbeef)
 #define BCM_6328_DSL_BASE               (0xb0001900)
 #define BCM_6328_UBUS_BASE              (0xdeadbeef)
@@ -232,6 +234,7 @@ enum bcm63xx_regs_set {
 #define BCM_6338_USBH_PRIV_BASE         (0xdeadbeef)
 #define BCM_6338_MPI_BASE               (0xfffe3160)
 #define BCM_6338_PCMCIA_BASE            (0xdeadbeef)
+#define BCM_6338_PCIE_BASE              (0xdeadbeef)
 #define BCM_6338_SDRAM_REGS_BASE        (0xfffe3100)
 #define BCM_6338_DSL_BASE               (0xfffe1000)
 #define BCM_6338_UBUS_BASE              (0xdeadbeef)
@@ -279,6 +282,7 @@ enum bcm63xx_regs_set {
 #define BCM_6345_ENETSW_BASE            (0xdeadbeef)
 #define BCM_6345_PCMCIA_BASE            (0xfffe2028)
 #define BCM_6345_MPI_BASE               (0xfffe2000)
+#define BCM_6345_PCIE_BASE              (0xdeadbeef)
 #define BCM_6345_OHCI0_BASE             (0xfffe2100)
 #define BCM_6345_OHCI_PRIV_BASE         (0xfffe2200)
 #define BCM_6345_USBH_PRIV_BASE         (0xdeadbeef)
@@ -320,6 +324,7 @@ enum bcm63xx_regs_set {
 #define BCM_6348_USBH_PRIV_BASE         (0xdeadbeef)
 #define BCM_6348_MPI_BASE               (0xfffe2000)
 #define BCM_6348_PCMCIA_BASE            (0xfffe2054)
+#define BCM_6348_PCIE_BASE              (0xdeadbeef)
 #define BCM_6348_SDRAM_REGS_BASE        (0xfffe2300)
 #define BCM_6348_M2M_BASE               (0xfffe2800)
 #define BCM_6348_DSL_BASE               (0xfffe3000)
@@ -362,6 +367,7 @@ enum bcm63xx_regs_set {
 #define BCM_6358_USBH_PRIV_BASE         (0xfffe1500)
 #define BCM_6358_MPI_BASE               (0xfffe1000)
 #define BCM_6358_PCMCIA_BASE            (0xfffe1054)
+#define BCM_6358_PCIE_BASE              (0xdeadbeef)
 #define BCM_6358_SDRAM_REGS_BASE        (0xfffe2300)
 #define BCM_6358_M2M_BASE               (0xdeadbeef)
 #define BCM_6358_DSL_BASE               (0xfffe3000)
@@ -405,6 +411,7 @@ enum bcm63xx_regs_set {
 #define BCM_6368_USBH_PRIV_BASE         (0xb0001700)
 #define BCM_6368_MPI_BASE               (0xb0001000)
 #define BCM_6368_PCMCIA_BASE            (0xb0001054)
+#define BCM_6368_PCIE_BASE              (0xdeadbeef)
 #define BCM_6368_SDRAM_REGS_BASE        (0xdeadbeef)
 #define BCM_6368_M2M_BASE               (0xdeadbeef)
 #define BCM_6368_DSL_BASE               (0xdeadbeef)
@@ -453,6 +460,7 @@ extern const unsigned long *bcm63xx_regs_base;
         __GEN_RSET_BASE(__cpu, USBH_PRIV)                               \
         __GEN_RSET_BASE(__cpu, MPI)                                     \
         __GEN_RSET_BASE(__cpu, PCMCIA)                                  \
+        __GEN_RSET_BASE(__cpu, PCIE)                                    \
         __GEN_RSET_BASE(__cpu, DSL)                                     \
         __GEN_RSET_BASE(__cpu, ENET0)                                   \
         __GEN_RSET_BASE(__cpu, ENET1)                                   \
@@ -493,6 +501,7 @@ extern const unsigned long *bcm63xx_regs_base;
         [RSET_USBH_PRIV]        = BCM_## __cpu ##_USBH_PRIV_BASE,       \
         [RSET_MPI]              = BCM_## __cpu ##_MPI_BASE,             \
         [RSET_PCMCIA]           = BCM_## __cpu ##_PCMCIA_BASE,          \
+        [RSET_PCIE]             = BCM_## __cpu ##_PCIE_BASE,            \
         [RSET_DSL]              = BCM_## __cpu ##_DSL_BASE,             \
         [RSET_ENET0]            = BCM_## __cpu ##_ENET0_BASE,           \
         [RSET_ENET1]            = BCM_## __cpu ##_ENET1_BASE,           \
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_io.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_io.h
index 6dcd8b23592b..9203d90e610c 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_io.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_io.h
@@ -40,6 +40,10 @@
 #define BCM_CB_MEM_END_PA               (BCM_CB_MEM_BASE_PA +           \
                                         BCM_CB_MEM_SIZE - 1)
 
+#define BCM_PCIE_MEM_BASE_PA            0x10f00000
+#define BCM_PCIE_MEM_SIZE               (16 * 1024 * 1024)
+#define BCM_PCIE_MEM_END_PA             (BCM_PCIE_MEM_BASE_PA +         \
+                                        BCM_PCIE_MEM_SIZE - 1)
 
 /*
  * Internal registers are accessed through KSEG3
@@ -85,6 +89,8 @@
 #define bcm_mpi_writel(v, o)    bcm_rset_writel(RSET_MPI, (v), (o))
 #define bcm_pcmcia_readl(o)     bcm_rset_readl(RSET_PCMCIA, (o))
 #define bcm_pcmcia_writel(v, o) bcm_rset_writel(RSET_PCMCIA, (v), (o))
+#define bcm_pcie_readl(o)       bcm_rset_readl(RSET_PCIE, (o))
+#define bcm_pcie_writel(v, o)   bcm_rset_writel(RSET_PCIE, (v), (o))
 #define bcm_sdram_readl(o)      bcm_rset_readl(RSET_SDRAM, (o))
 #define bcm_sdram_writel(v, o)  bcm_rset_writel(RSET_SDRAM, (v), (o))
 #define bcm_memc_readl(o)       bcm_rset_readl(RSET_MEMC, (o))
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
index 4fc2ab2c278a..4ccc2a748aff 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
@@ -1162,6 +1162,9 @@
 /*************************************************************************
  * _REG relative to RSET_MISC
  *************************************************************************/
+#define MISC_SERDES_CTRL_REG            0x0
+#define SERDES_PCIE_EN                  (1 << 0)
+#define SERDES_PCIE_EXD_EN              (1 << 15)
 
 #define MISC_STRAPBUS_6328_REG          0x240
 #define STRAPBUS_6328_FCVO_SHIFT        7
@@ -1169,4 +1172,55 @@
 #define STRAPBUS_6328_BOOT_SEL_SERIAL   (1 << 28)
 #define STRAPBUS_6328_BOOT_SEL_NAND     (0 << 28)
 
+/*************************************************************************
+ * _REG relative to RSET_PCIE
+ *************************************************************************/
+
+#define PCIE_CONFIG2_REG                0x408
+#define CONFIG2_BAR1_SIZE_EN            1
+#define CONFIG2_BAR1_SIZE_MASK          0xf
+
+#define PCIE_IDVAL3_REG                 0x43c
+#define IDVAL3_CLASS_CODE_MASK          0xffffff
+#define IDVAL3_SUBCLASS_SHIFT           8
+#define IDVAL3_CLASS_SHIFT              16
+
+#define PCIE_DLSTATUS_REG               0x1048
+#define DLSTATUS_PHYLINKUP              (1 << 13)
+
+#define PCIE_BRIDGE_OPT1_REG            0x2820
+#define OPT1_RD_BE_OPT_EN               (1 << 7)
+#define OPT1_RD_REPLY_BE_FIX_EN         (1 << 9)
+#define OPT1_PCIE_BRIDGE_HOLE_DET_EN    (1 << 11)
+#define OPT1_L1_INT_STATUS_MASK_POL     (1 << 12)
+
+#define PCIE_BRIDGE_OPT2_REG            0x2824
+#define OPT2_UBUS_UR_DECODE_DIS         (1 << 2)
+#define OPT2_TX_CREDIT_CHK_EN           (1 << 4)
+#define OPT2_CFG_TYPE1_BD_SEL           (1 << 7)
+#define OPT2_CFG_TYPE1_BUS_NO_SHIFT     16
+#define OPT2_CFG_TYPE1_BUS_NO_MASK      (0xff << OPT2_CFG_TYPE1_BUS_NO_SHIFT)
+
+#define PCIE_BRIDGE_BAR0_BASEMASK_REG   0x2828
+#define PCIE_BRIDGE_BAR1_BASEMASK_REG   0x2830
+#define BASEMASK_REMAP_EN               (1 << 0)
+#define BASEMASK_SWAP_EN                (1 << 1)
+#define BASEMASK_MASK_SHIFT             4
+#define BASEMASK_MASK_MASK              (0xfff << BASEMASK_MASK_SHIFT)
+#define BASEMASK_BASE_SHIFT             20
+#define BASEMASK_BASE_MASK              (0xfff << BASEMASK_BASE_SHIFT)
+
+#define PCIE_BRIDGE_BAR0_REBASE_ADDR_REG 0x282c
+#define PCIE_BRIDGE_BAR1_REBASE_ADDR_REG 0x2834
+#define REBASE_ADDR_BASE_SHIFT          20
+#define REBASE_ADDR_BASE_MASK           (0xfff << REBASE_ADDR_BASE_SHIFT)
+
+#define PCIE_BRIDGE_RC_INT_MASK_REG     0x2854
+#define PCIE_RC_INT_A                   (1 << 0)
+#define PCIE_RC_INT_B                   (1 << 1)
+#define PCIE_RC_INT_C                   (1 << 2)
+#define PCIE_RC_INT_D                   (1 << 3)
+
+#define PCIE_DEVICE_OFFSET              0x8000
+
 #endif /* BCM63XX_REGS_H_ */
diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
index 822ae179bc56..4a156629e958 100644
--- a/arch/mips/pci/ops-bcm63xx.c
+++ b/arch/mips/pci/ops-bcm63xx.c
@@ -465,3 +465,64 @@ static void bcm63xx_fixup(struct pci_dev *dev)
 
 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
 #endif
+
+static int bcm63xx_pcie_can_access(struct pci_bus *bus, int devfn)
+{
+        switch (bus->number) {
+        case PCIE_BUS_BRIDGE:
+                return (PCI_SLOT(devfn) == 0);
+        case PCIE_BUS_DEVICE:
+                if (PCI_SLOT(devfn) == 0)
+                        return bcm_pcie_readl(PCIE_DLSTATUS_REG)
+                                        & DLSTATUS_PHYLINKUP;
+        default:
+                return false;
+        }
+}
+
+static int bcm63xx_pcie_read(struct pci_bus *bus, unsigned int devfn,
+                             int where, int size, u32 *val)
+{
+        u32 data;
+        u32 reg = where & ~3;
+
+        if (!bcm63xx_pcie_can_access(bus, devfn))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        if (bus->number == PCIE_BUS_DEVICE)
+                reg += PCIE_DEVICE_OFFSET;
+
+        data = bcm_pcie_readl(reg);
+
+        *val = postprocess_read(data, where, size);
+
+        return PCIBIOS_SUCCESSFUL;
+
+}
+
+static int bcm63xx_pcie_write(struct pci_bus *bus, unsigned int devfn,
+                              int where, int size, u32 val)
+{
+        u32 data;
+        u32 reg = where & ~3;
+
+        if (!bcm63xx_pcie_can_access(bus, devfn))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        if (bus->number == PCIE_BUS_DEVICE)
+                reg += PCIE_DEVICE_OFFSET;
+
+
+        data = bcm_pcie_readl(reg);
+
+        data = preprocess_write(data, val, where, size);
+        bcm_pcie_writel(data, reg);
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+
+struct pci_ops bcm63xx_pcie_ops = {
+        .read   = bcm63xx_pcie_read,
+        .write  = bcm63xx_pcie_write
+};
diff --git a/arch/mips/pci/pci-bcm63xx.c b/arch/mips/pci/pci-bcm63xx.c
index a2b6d55a2492..8a48139d219c 100644
--- a/arch/mips/pci/pci-bcm63xx.c
+++ b/arch/mips/pci/pci-bcm63xx.c
@@ -10,6 +10,7 @@
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/delay.h>
 #include <asm/bootinfo.h>
 
 #include "pci-bcm63xx.h"
@@ -71,6 +72,26 @@ struct pci_controller bcm63xx_cb_controller = {
 };
 #endif
 
+static struct resource bcm_pcie_mem_resource = {
+        .name   = "bcm63xx PCIe memory space",
+        .start  = BCM_PCIE_MEM_BASE_PA,
+        .end    = BCM_PCIE_MEM_END_PA,
+        .flags  = IORESOURCE_MEM,
+};
+
+static struct resource bcm_pcie_io_resource = {
+        .name   = "bcm63xx PCIe IO space",
+        .start  = 0,
+        .end    = 0,
+        .flags  = 0,
+};
+
+struct pci_controller bcm63xx_pcie_controller = {
+        .pci_ops        = &bcm63xx_pcie_ops,
+        .io_resource    = &bcm_pcie_io_resource,
+        .mem_resource   = &bcm_pcie_mem_resource,
+};
+
 static u32 bcm63xx_int_cfg_readl(u32 reg)
 {
         u32 tmp;
@@ -94,6 +115,95 @@ static void bcm63xx_int_cfg_writel(u32 val, u32 reg)
 
 void __iomem *pci_iospace_start;
 
+static void __init bcm63xx_reset_pcie(void)
+{
+        u32 val;
+
+        /* enable clock */
+        val = bcm_perf_readl(PERF_CKCTL_REG);
+        val |= CKCTL_6328_PCIE_EN;
+        bcm_perf_writel(val, PERF_CKCTL_REG);
+
+        /* enable SERDES */
+        val = bcm_misc_readl(MISC_SERDES_CTRL_REG);
+        val |= SERDES_PCIE_EN | SERDES_PCIE_EXD_EN;
+        bcm_misc_writel(val, MISC_SERDES_CTRL_REG);
+
+        /* reset the PCIe core */
+        val = bcm_perf_readl(PERF_SOFTRESET_6328_REG);
+
+        val &= ~SOFTRESET_6328_PCIE_MASK;
+        val &= ~SOFTRESET_6328_PCIE_CORE_MASK;
+        val &= ~SOFTRESET_6328_PCIE_HARD_MASK;
+        val &= ~SOFTRESET_6328_PCIE_EXT_MASK;
+        bcm_perf_writel(val, PERF_SOFTRESET_6328_REG);
+        mdelay(10);
+
+        val |= SOFTRESET_6328_PCIE_MASK;
+        val |= SOFTRESET_6328_PCIE_CORE_MASK;
+        val |= SOFTRESET_6328_PCIE_HARD_MASK;
+        bcm_perf_writel(val, PERF_SOFTRESET_6328_REG);
+        mdelay(10);
+
+        val |= SOFTRESET_6328_PCIE_EXT_MASK;
+        bcm_perf_writel(val, PERF_SOFTRESET_6328_REG);
+        mdelay(200);
+}
+
+static int __init bcm63xx_register_pcie(void)
+{
+        u32 val;
+
+        bcm63xx_reset_pcie();
+
+        /* configure the PCIe bridge */
+        val = bcm_pcie_readl(PCIE_BRIDGE_OPT1_REG);
+        val |= OPT1_RD_BE_OPT_EN;
+        val |= OPT1_RD_REPLY_BE_FIX_EN;
+        val |= OPT1_PCIE_BRIDGE_HOLE_DET_EN;
+        val |= OPT1_L1_INT_STATUS_MASK_POL;
+        bcm_pcie_writel(val, PCIE_BRIDGE_OPT1_REG);
+
+        /* setup the interrupts */
+        val = bcm_pcie_readl(PCIE_BRIDGE_RC_INT_MASK_REG);
+        val |= PCIE_RC_INT_A | PCIE_RC_INT_B | PCIE_RC_INT_C | PCIE_RC_INT_D;
+        bcm_pcie_writel(val, PCIE_BRIDGE_RC_INT_MASK_REG);
+
+        val = bcm_pcie_readl(PCIE_BRIDGE_OPT2_REG);
+        /* enable credit checking and error checking */
+        val |= OPT2_TX_CREDIT_CHK_EN;
+        val |= OPT2_UBUS_UR_DECODE_DIS;
+
+        /* set device bus/func for the pcie device */
+        val |= (PCIE_BUS_DEVICE << OPT2_CFG_TYPE1_BUS_NO_SHIFT);
+        val |= OPT2_CFG_TYPE1_BD_SEL;
+        bcm_pcie_writel(val, PCIE_BRIDGE_OPT2_REG);
+
+        /* setup class code as bridge */
+        val = bcm_pcie_readl(PCIE_IDVAL3_REG);
+        val &= ~IDVAL3_CLASS_CODE_MASK;
+        val |= (PCI_CLASS_BRIDGE_PCI << IDVAL3_SUBCLASS_SHIFT);
+        bcm_pcie_writel(val, PCIE_IDVAL3_REG);
+
+        /* disable bar1 size */
+        val = bcm_pcie_readl(PCIE_CONFIG2_REG);
+        val &= ~CONFIG2_BAR1_SIZE_MASK;
+        bcm_pcie_writel(val, PCIE_CONFIG2_REG);
+
+        /* set bar0 to little endian */
+        val = (BCM_PCIE_MEM_BASE_PA >> 20) << BASEMASK_BASE_SHIFT;
+        val |= (BCM_PCIE_MEM_BASE_PA >> 20) << BASEMASK_MASK_SHIFT;
+        val |= BASEMASK_REMAP_EN;
+        bcm_pcie_writel(val, PCIE_BRIDGE_BAR0_BASEMASK_REG);
+
+        val = (BCM_PCIE_MEM_BASE_PA >> 20) << REBASE_ADDR_BASE_SHIFT;
+        bcm_pcie_writel(val, PCIE_BRIDGE_BAR0_REBASE_ADDR_REG);
+
+        register_pci_controller(&bcm63xx_pcie_controller);
+
+        return 0;
+}
+
 static int __init bcm63xx_register_pci(void)
 {
         unsigned int mem_size;
@@ -221,6 +331,8 @@ static int __init bcm63xx_pci_init(void)
                 return -ENODEV;
 
         switch (bcm63xx_get_cpu_id()) {
+        case BCM6328_CPU_ID:
+                return bcm63xx_register_pcie();
         case BCM6348_CPU_ID:
         case BCM6358_CPU_ID:
         case BCM6368_CPU_ID:
diff --git a/arch/mips/pci/pci-bcm63xx.h b/arch/mips/pci/pci-bcm63xx.h
index a6e594ef3d6a..e6736d558ac7 100644
--- a/arch/mips/pci/pci-bcm63xx.h
+++ b/arch/mips/pci/pci-bcm63xx.h
@@ -13,11 +13,16 @@
  */
 #define CARDBUS_PCI_IDSEL       0x8
 
+
+#define PCIE_BUS_BRIDGE         0
+#define PCIE_BUS_DEVICE         1
+
 /*
  * defined in ops-bcm63xx.c
  */
 extern struct pci_ops bcm63xx_pci_ops;
 extern struct pci_ops bcm63xx_cb_ops;
+extern struct pci_ops bcm63xx_pcie_ops;
 
 /*
  * defined in pci-bcm63xx.c