net: zynq_gem: Added 64-bit addressing support

This patch adds 64-bit addressing support for zynq gem.
This means it can perform send and receive operations on
64-bit address buffers.

Signed-off-by: Vipul Kumar <vipul.kumar@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index bc33126..ee528db 100644 (file)
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -86,10 +86,17 @@ DECLARE_GLOBAL_DATA_PTR;
 /* Set with binary 00011000 to use 1536 byte(1*max length frame/buffer) */
 #define ZYNQ_GEM_DMACR_RXBUF           0x00180000
 
+#if defined(CONFIG_PHYS_64BIT)
+# define ZYNQ_GEM_DMA_BUS_WIDTH                BIT(30) /* 64 bit bus */
+#else
+# define ZYNQ_GEM_DMA_BUS_WIDTH                (0 << 30) /* 32 bit bus */
+#endif
+
 #define ZYNQ_GEM_DMACR_INIT            (ZYNQ_GEM_DMACR_BLENGTH | \
                                        ZYNQ_GEM_DMACR_RXSIZE | \
                                        ZYNQ_GEM_DMACR_TXSIZE | \
-                                       ZYNQ_GEM_DMACR_RXBUF)
+                                       ZYNQ_GEM_DMACR_RXBUF | \
+                                       ZYNQ_GEM_DMA_BUS_WIDTH)
 
 #define ZYNQ_GEM_TSR_DONE              0x00000020 /* Tx done mask */
 
@@ -147,12 +154,20 @@ struct zynq_gem_regs {
        u32 transmit_q1_ptr; /* 0x440 - Transmit priority queue 1 */
        u32 reserved8[15];
        u32 receive_q1_ptr; /* 0x480 - Receive priority queue 1 */
+       u32 reserved10[17];
+       u32 upper_txqbase; /* 0x4C8 - Upper tx_q base addr */
+       u32 reserved11[2];
+       u32 upper_rxqbase; /* 0x4D4 - Upper rx_q base addr */
 };
 
 /* BD descriptors */
 struct emac_bd {
        u32 addr; /* Next descriptor pointer */
        u32 status;
+#if defined(CONFIG_PHYS_64BIT)
+       u32 addr_hi;
+       u32 reserved;
+#endif
 };
 
 #define RX_BUF 32
@@ -390,13 +405,21 @@ static int zynq_gem_init(struct udevice *dev)
                for (i = 0; i < RX_BUF; i++) {
                        priv->rx_bd[i].status = 0xF0000000;
                        priv->rx_bd[i].addr =
-                                       ((ulong)(priv->rxbuffers) +
-                                                       (i * PKTSIZE_ALIGN));
-               }
+                                       (lower_32_bits((ulong)(priv->rxbuffers)
+                                                       + (i * PKTSIZE_ALIGN)));
+#if defined(CONFIG_PHYS_64BIT)
+                       priv->rx_bd[i].addr_hi =
+                                       (upper_32_bits((ulong)(priv->rxbuffers)
+                                                       + (i * PKTSIZE_ALIGN)));
+#endif
+       }
                /* WRAP bit to last BD */
                priv->rx_bd[--i].addr |= ZYNQ_GEM_RXBUF_WRAP_MASK;
                /* Write RxBDs to IP */
-               writel((ulong)priv->rx_bd, &regs->rxqbase);
+               writel(lower_32_bits((ulong)priv->rx_bd), &regs->rxqbase);
+#if defined(CONFIG_PHYS_64BIT)
+               writel(upper_32_bits((ulong)priv->rx_bd), &regs->upper_rxqbase);
+#endif
 
                /* Setup for DMA Configuration register */
                writel(ZYNQ_GEM_DMACR_INIT, &regs->dmacr);
@@ -406,12 +429,18 @@ static int zynq_gem_init(struct udevice *dev)
 
                /* Disable the second priority queue */
                dummy_tx_bd->addr = 0;
+#if defined(CONFIG_PHYS_64BIT)
+               dummy_tx_bd->addr_hi = 0;
+#endif
                dummy_tx_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
                                ZYNQ_GEM_TXBUF_LAST_MASK|
                                ZYNQ_GEM_TXBUF_USED_MASK;
 
                dummy_rx_bd->addr = ZYNQ_GEM_RXBUF_WRAP_MASK |
                                ZYNQ_GEM_RXBUF_NEW_MASK;
+#if defined(CONFIG_PHYS_64BIT)
+               dummy_rx_bd->addr_hi = 0;
+#endif
                dummy_rx_bd->status = 0;
 
                writel((ulong)dummy_tx_bd, &regs->transmit_q1_ptr);
@@ -485,7 +514,8 @@ static int zynq_gem_init(struct udevice *dev)
 
 static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
 {
-       u32 addr, size;
+       dma_addr_t addr;
+       u32 size;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct zynq_gem_regs *regs = priv->iobase;
        struct emac_bd *current_bd = &priv->tx_bd[1];
@@ -493,17 +523,26 @@ static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
        /* Setup Tx BD */
        memset(priv->tx_bd, 0, sizeof(struct emac_bd));
 
-       priv->tx_bd->addr = (ulong)ptr;
+       priv->tx_bd->addr = lower_32_bits((ulong)ptr);
+#if defined(CONFIG_PHYS_64BIT)
+       priv->tx_bd->addr_hi = upper_32_bits((ulong)ptr);
+#endif
        priv->tx_bd->status = (len & ZYNQ_GEM_TXBUF_FRMLEN_MASK) |
                               ZYNQ_GEM_TXBUF_LAST_MASK;
        /* Dummy descriptor to mark it as the last in descriptor chain */
        current_bd->addr = 0x0;
+#if defined(CONFIG_PHYS_64BIT)
+       current_bd->addr_hi = 0x0;
+#endif
        current_bd->status = ZYNQ_GEM_TXBUF_WRAP_MASK |
                             ZYNQ_GEM_TXBUF_LAST_MASK|
                             ZYNQ_GEM_TXBUF_USED_MASK;
 
        /* setup BD */
-       writel((ulong)priv->tx_bd, &regs->txqbase);
+       writel(lower_32_bits((ulong)priv->tx_bd), &regs->txqbase);
+#if defined(CONFIG_PHYS_64BIT)
+       writel(upper_32_bits((ulong)priv->tx_bd), &regs->upper_txqbase);
+#endif
 
        addr = (ulong) ptr;
        addr &= ~(ARCH_DMA_MINALIGN - 1);
@@ -531,7 +570,7 @@ static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
 static int zynq_gem_recv(struct udevice *dev, int flags, uchar **packetp)
 {
        int frame_len;
-       u32 addr;
+       dma_addr_t addr;
        struct zynq_gem_priv *priv = dev_get_priv(dev);
        struct emac_bd *current_bd = &priv->rx_bd[priv->rxbd_current];
 
@@ -550,8 +589,14 @@ static int zynq_gem_recv(struct udevice *dev, int flags, uchar **packetp)
                return -1;
        }
 
+#if defined(CONFIG_PHYS_64BIT)
+       addr = (dma_addr_t)((current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK)
+                     | ((dma_addr_t)current_bd->addr_hi << 32));
+#else
        addr = current_bd->addr & ZYNQ_GEM_RXBUF_ADD_MASK;
+#endif
        addr &= ~(ARCH_DMA_MINALIGN - 1);
+
        *packetp = (uchar *)(uintptr_t)addr;
 
        return frame_len;