powerpc/fsl-rio: add support for mapping inbound windows

Add support for mapping and unmapping of inbound rapidio windows.  This
allows for drivers to open up a part of local memory on the rapidio
network.  Also applications can use this and tranfer blocks of data
over the network.

Signed-off-by: Martijn de Gouw <martijn.de.gouw@prodrive-technologies.com>
[scottwood@freescale.com: updated commit message based on review]
Signed-off-by: Scott Wood <scottwood@freescale.com>

2 files changed, 117 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index c04b718307c8..08d60f183dad 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -58,6 +58,19 @@
 #define RIO_ISR_AACR            0x10120
 #define RIO_ISR_AACR_AA         0x1     /* Accept All ID */
 
+#define RIWTAR_TRAD_VAL_SHIFT   12
+#define RIWTAR_TRAD_MASK        0x00FFFFFF
+#define RIWBAR_BADD_VAL_SHIFT   12
+#define RIWBAR_BADD_MASK        0x003FFFFF
+#define RIWAR_ENABLE            0x80000000
+#define RIWAR_TGINT_LOCAL       0x00F00000
+#define RIWAR_RDTYP_NO_SNOOP    0x00040000
+#define RIWAR_RDTYP_SNOOP       0x00050000
+#define RIWAR_WRTYP_NO_SNOOP    0x00004000
+#define RIWAR_WRTYP_SNOOP       0x00005000
+#define RIWAR_WRTYP_ALLOC       0x00006000
+#define RIWAR_SIZE_MASK         0x0000003F
+
 #define __fsl_read_rio_config(x, addr, err, op)         \
         __asm__ __volatile__(                           \
                 "1:     "op" %1,0(%2)\n"                \
@@ -266,6 +279,89 @@ fsl_rio_config_write(struct rio_mport *mport, int index, u16 destid,
         return 0;
 }
 
+static void fsl_rio_inbound_mem_init(struct rio_priv *priv)
+{
+        int i;
+
+        /* close inbound windows */
+        for (i = 0; i < RIO_INB_ATMU_COUNT; i++)
+                out_be32(&priv->inb_atmu_regs[i].riwar, 0);
+}
+
+int fsl_map_inb_mem(struct rio_mport *mport, dma_addr_t lstart,
+        u64 rstart, u32 size, u32 flags)
+{
+        struct rio_priv *priv = mport->priv;
+        u32 base_size;
+        unsigned int base_size_log;
+        u64 win_start, win_end;
+        u32 riwar;
+        int i;
+
+        if ((size & (size - 1)) != 0)
+                return -EINVAL;
+
+        base_size_log = ilog2(size);
+        base_size = 1 << base_size_log;
+
+        /* check if addresses are aligned with the window size */
+        if (lstart & (base_size - 1))
+                return -EINVAL;
+        if (rstart & (base_size - 1))
+                return -EINVAL;
+
+        /* check for conflicting ranges */
+        for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
+                riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
+                if ((riwar & RIWAR_ENABLE) == 0)
+                        continue;
+                win_start = ((u64)(in_be32(&priv->inb_atmu_regs[i].riwbar) & RIWBAR_BADD_MASK))
+                        << RIWBAR_BADD_VAL_SHIFT;
+                win_end = win_start + ((1 << ((riwar & RIWAR_SIZE_MASK) + 1)) - 1);
+                if (rstart < win_end && (rstart + size) > win_start)
+                        return -EINVAL;
+        }
+
+        /* find unused atmu */
+        for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
+                riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
+                if ((riwar & RIWAR_ENABLE) == 0)
+                        break;
+        }
+        if (i >= RIO_INB_ATMU_COUNT)
+                return -ENOMEM;
+
+        out_be32(&priv->inb_atmu_regs[i].riwtar, lstart >> RIWTAR_TRAD_VAL_SHIFT);
+        out_be32(&priv->inb_atmu_regs[i].riwbar, rstart >> RIWBAR_BADD_VAL_SHIFT);
+        out_be32(&priv->inb_atmu_regs[i].riwar, RIWAR_ENABLE | RIWAR_TGINT_LOCAL |
+                RIWAR_RDTYP_SNOOP | RIWAR_WRTYP_SNOOP | (base_size_log - 1));
+
+        return 0;
+}
+
+void fsl_unmap_inb_mem(struct rio_mport *mport, dma_addr_t lstart)
+{
+        u32 win_start_shift, base_start_shift;
+        struct rio_priv *priv = mport->priv;
+        u32 riwar, riwtar;
+        int i;
+
+        /* skip default window */
+        base_start_shift = lstart >> RIWTAR_TRAD_VAL_SHIFT;
+        for (i = 0; i < RIO_INB_ATMU_COUNT; i++) {
+                riwar = in_be32(&priv->inb_atmu_regs[i].riwar);
+                if ((riwar & RIWAR_ENABLE) == 0)
+                        continue;
+
+                riwtar = in_be32(&priv->inb_atmu_regs[i].riwtar);
+                win_start_shift = riwtar & RIWTAR_TRAD_MASK;
+                if (win_start_shift == base_start_shift) {
+                        out_be32(&priv->inb_atmu_regs[i].riwar, riwar & ~RIWAR_ENABLE);
+                        return;
+                }
+        }
+}
+
 void fsl_rio_port_error_handler(int offset)
 {
         /*XXX: Error recovery is not implemented, we just clear errors */
@@ -389,6 +485,8 @@ int fsl_rio_setup(struct platform_device *dev)
         ops->add_outb_message = fsl_add_outb_message;
         ops->add_inb_buffer = fsl_add_inb_buffer;
         ops->get_inb_message = fsl_get_inb_message;
+        ops->map_inb = fsl_map_inb_mem;
+        ops->unmap_inb = fsl_unmap_inb_mem;
 
         rmu_node = of_parse_phandle(dev->dev.of_node, "fsl,srio-rmu-handle", 0);
         if (!rmu_node) {
@@ -602,6 +700,11 @@ int fsl_rio_setup(struct platform_device *dev)
                         RIO_ATMU_REGS_PORT2_OFFSET));
 
                 priv->maint_atmu_regs = priv->atmu_regs + 1;
+                priv->inb_atmu_regs = (struct rio_inb_atmu_regs __iomem *)
+                        (priv->regs_win +
+                        ((i == 0) ? RIO_INB_ATMU_REGS_PORT1_OFFSET :
+                        RIO_INB_ATMU_REGS_PORT2_OFFSET));
+
 
                 /* Set to receive any dist ID for serial RapidIO controller. */
                 if (port->phy_type == RIO_PHY_SERIAL)
@@ -620,6 +723,7 @@ int fsl_rio_setup(struct platform_device *dev)
                 rio_law_start = range_start;
 
                 fsl_rio_setup_rmu(port, rmu_np[i]);
+                fsl_rio_inbound_mem_init(priv);
 
                 dbell->mport[i] = port;
 
diff --git a/arch/powerpc/sysdev/fsl_rio.h b/arch/powerpc/sysdev/fsl_rio.h
index ae8e27405a0d..d53407a34f32 100644
--- a/arch/powerpc/sysdev/fsl_rio.h
+++ b/arch/powerpc/sysdev/fsl_rio.h
@@ -50,9 +50,12 @@
 #define RIO_S_DBELL_REGS_OFFSET 0x13400
 #define RIO_S_PW_REGS_OFFSET    0x134e0
 #define RIO_ATMU_REGS_DBELL_OFFSET      0x10C40
+#define RIO_INB_ATMU_REGS_PORT1_OFFSET 0x10d60
+#define RIO_INB_ATMU_REGS_PORT2_OFFSET 0x10f60
 
 #define MAX_MSG_UNIT_NUM        2
 #define MAX_PORT_NUM            4
+#define RIO_INB_ATMU_COUNT      4
 
 struct rio_atmu_regs {
          u32 rowtar;
@@ -63,6 +66,15 @@ struct rio_atmu_regs {
          u32 pad2[3];
 };
 
+struct rio_inb_atmu_regs {
+        u32 riwtar;
+        u32 pad1;
+        u32 riwbar;
+        u32 pad2;
+        u32 riwar;
+        u32 pad3[3];
+};
+
 struct rio_dbell_ring {
         void *virt;
         dma_addr_t phys;
@@ -99,6 +111,7 @@ struct rio_priv {
         void __iomem *regs_win;
         struct rio_atmu_regs __iomem *atmu_regs;
         struct rio_atmu_regs __iomem *maint_atmu_regs;
+        struct rio_inb_atmu_regs __iomem *inb_atmu_regs;
         void __iomem *maint_win;
         void *rmm_handle; /* RapidIO message manager(unit) Handle */
 };