bcm63xx_enet: add support Broadcom BCM6345 Ethernet

This patch adds support for the Broadcom BCM6345 SoC Ethernet. BCM6345
has a slightly different and older DMA engine which requires the
following modifications:

- the width of the DMA channels on BCM6345 is 64 bytes vs 16 bytes,
  which means that the helpers enet_dma{c,s} need to account for this
  channel width and we can no longer use macros

- BCM6345 DMA engine does not have any internal SRAM for transfering
  buffers

- BCM6345 buffer allocation and flow control is not per-channel but
  global (done in RSET_ENETDMA)

- the DMA engine bits are right-shifted by 3 compared to other DMA
  generations

- the DMA enable/interrupt masks are a little different (we need to
  enabled more bits for 6345)

- some register have the same meaning but are offsetted in the ENET_DMAC
  space so a lookup table is required to return the proper offset

The MAC itself is identical and requires no modifications to work.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 131 insertions, 9 deletions

diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
index 9981f4f0e42f..e6e65dc7d502 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
@@ -174,6 +174,7 @@ enum bcm63xx_regs_set {
 #define BCM_6368_RSET_SPI_SIZE          1804
 #define RSET_ENET_SIZE                  2048
 #define RSET_ENETDMA_SIZE               256
+#define RSET_6345_ENETDMA_SIZE          64
 #define RSET_ENETDMAC_SIZE(chans)       (16 * (chans))
 #define RSET_ENETDMAS_SIZE(chans)       (16 * (chans))
 #define RSET_ENETSW_SIZE                65536
@@ -300,7 +301,7 @@ enum bcm63xx_regs_set {
 #define BCM_6345_USBDMA_BASE            (0xfffe2800)
 #define BCM_6345_ENET0_BASE             (0xfffe1800)
 #define BCM_6345_ENETDMA_BASE           (0xfffe2800)
-#define BCM_6345_ENETDMAC_BASE          (0xfffe2900)
+#define BCM_6345_ENETDMAC_BASE          (0xfffe2840)
 #define BCM_6345_ENETDMAS_BASE          (0xfffe2a00)
 #define BCM_6345_ENETSW_BASE            (0xdeadbeef)
 #define BCM_6345_PCMCIA_BASE            (0xfffe2028)
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_enet.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_enet.h
index 118e3c938841..753953e86242 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_enet.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_enet.h
@@ -4,6 +4,8 @@
 #include <linux/if_ether.h>
 #include <linux/init.h>
 
+#include <bcm63xx_regs.h>
+
 /*
  * on board ethernet platform data
  */
@@ -37,6 +39,21 @@ struct bcm63xx_enet_platform_data {
                                           int phy_id, int reg),
                           void (*mii_write)(struct net_device *dev,
                                             int phy_id, int reg, int val));
+
+        /* DMA channel enable mask */
+        u32 dma_chan_en_mask;
+
+        /* DMA channel interrupt mask */
+        u32 dma_chan_int_mask;
+
+        /* DMA engine has internal SRAM */
+        bool dma_has_sram;
+
+        /* DMA channel register width */
+        unsigned int dma_chan_width;
+
+        /* DMA descriptor shift */
+        unsigned int dma_desc_shift;
 };
 
 /*
@@ -63,6 +80,18 @@ struct bcm63xx_enetsw_platform_data {
         char mac_addr[ETH_ALEN];
         int num_ports;
         struct bcm63xx_enetsw_port used_ports[ENETSW_MAX_PORT];
+
+        /* DMA channel enable mask */
+        u32 dma_chan_en_mask;
+
+        /* DMA channel interrupt mask */
+        u32 dma_chan_int_mask;
+
+        /* DMA channel register width */
+        unsigned int dma_chan_width;
+
+        /* DMA engine has internal SRAM */
+        bool dma_has_sram;
 };
 
 int __init bcm63xx_enet_register(int unit,
@@ -70,4 +99,69 @@ int __init bcm63xx_enet_register(int unit,
 
 int bcm63xx_enetsw_register(const struct bcm63xx_enetsw_platform_data *pd);
 
+enum bcm63xx_regs_enetdmac {
+        ENETDMAC_CHANCFG,
+        ENETDMAC_IR,
+        ENETDMAC_IRMASK,
+        ENETDMAC_MAXBURST,
+        ENETDMAC_BUFALLOC,
+        ENETDMAC_RSTART,
+        ENETDMAC_FC,
+        ENETDMAC_LEN,
+};
+
+static inline unsigned long bcm63xx_enetdmacreg(enum bcm63xx_regs_enetdmac reg)
+{
+#ifdef BCMCPU_RUNTIME_DETECT
+        extern const unsigned long *bcm63xx_regs_enetdmac;
+
+        return bcm63xx_regs_enetdmac[reg];
+#else
+#ifdef CONFIG_BCM63XX_CPU_6345
+        switch (reg) {
+        case ENETDMAC_CHANCFG:
+                return ENETDMA_6345_CHANCFG_REG;
+        case ENETDMAC_IR:
+                return ENETDMA_6345_IR_REG;
+        case ENETDMAC_IRMASK:
+                return ENETDMA_6345_IRMASK_REG;
+        case ENETDMAC_MAXBURST:
+                return ENETDMA_6345_MAXBURST_REG;
+        case ENETDMAC_BUFALLOC:
+                return ENETDMA_6345_BUFALLOC_REG;
+        case ENETDMAC_RSTART:
+                return ENETDMA_6345_RSTART_REG;
+        case ENETDMAC_FC:
+                return ENETDMA_6345_FC_REG;
+        case ENETDMAC_LEN:
+                return ENETDMA_6345_LEN_REG;
+        }
+#endif
+#if defined(CONFIG_BCM63XX_CPU_6328) || \
+        defined(CONFIG_BCM63XX_CPU_6338) || \
+        defined(CONFIG_BCM63XX_CPU_6348) || \
+        defined(CONFIG_BCM63XX_CPU_6358) || \
+        defined(CONFIG_BCM63XX_CPU_6362) || \
+        defined(CONFIG_BCM63XX_CPU_6368)
+        switch (reg) {
+        case ENETDMAC_CHANCFG:
+                return ENETDMAC_CHANCFG_REG;
+        case ENETDMAC_IR:
+                return ENETDMAC_IR_REG;
+        case ENETDMAC_IRMASK:
+                return ENETDMAC_IRMASK_REG;
+        case ENETDMAC_MAXBURST:
+                return ENETDMAC_MAXBURST_REG;
+        case ENETDMAC_BUFALLOC:
+        case ENETDMAC_RSTART:
+        case ENETDMAC_FC:
+        case ENETDMAC_LEN:
+                return 0;
+        }
+#endif
+#endif
+        return 0;
+}
+
+
 #endif /* ! BCM63XX_DEV_ENET_H_ */
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
index 0a2121abb1a6..eff7ca7d12b0 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
@@ -727,6 +727,8 @@
 /*************************************************************************
  * _REG relative to RSET_ENETDMA
  *************************************************************************/
+#define ENETDMA_CHAN_WIDTH              0x10
+#define ENETDMA_6345_CHAN_WIDTH         0x40
 
 /* Controller Configuration Register */
 #define ENETDMA_CFG_REG                 (0x0)
@@ -782,31 +784,56 @@
 /* State Ram Word 4 */
 #define ENETDMA_SRAM4_REG(x)            (0x20c + (x) * 0x10)
 
+/* Broadcom 6345 ENET DMA definitions */
+#define ENETDMA_6345_CHANCFG_REG        (0x00)
+
+#define ENETDMA_6345_MAXBURST_REG       (0x40)
+
+#define ENETDMA_6345_RSTART_REG         (0x08)
+
+#define ENETDMA_6345_LEN_REG            (0x0C)
+
+#define ENETDMA_6345_IR_REG             (0x14)
+
+#define ENETDMA_6345_IRMASK_REG         (0x18)
+
+#define ENETDMA_6345_FC_REG             (0x1C)
+
+#define ENETDMA_6345_BUFALLOC_REG       (0x20)
+
+/* Shift down for EOP, SOP and WRAP bits */
+#define ENETDMA_6345_DESC_SHIFT         (3)
 
 /*************************************************************************
  * _REG relative to RSET_ENETDMAC
  *************************************************************************/
 
 /* Channel Configuration register */
-#define ENETDMAC_CHANCFG_REG(x)         ((x) * 0x10)
+#define ENETDMAC_CHANCFG_REG            (0x0)
 #define ENETDMAC_CHANCFG_EN_SHIFT       0
 #define ENETDMAC_CHANCFG_EN_MASK        (1 << ENETDMAC_CHANCFG_EN_SHIFT)
 #define ENETDMAC_CHANCFG_PKTHALT_SHIFT  1
 #define ENETDMAC_CHANCFG_PKTHALT_MASK   (1 << ENETDMAC_CHANCFG_PKTHALT_SHIFT)
 #define ENETDMAC_CHANCFG_BUFHALT_SHIFT  2
 #define ENETDMAC_CHANCFG_BUFHALT_MASK   (1 << ENETDMAC_CHANCFG_BUFHALT_SHIFT)
+#define ENETDMAC_CHANCFG_CHAINING_SHIFT 2
+#define ENETDMAC_CHANCFG_CHAINING_MASK  (1 << ENETDMAC_CHANCFG_CHAINING_SHIFT)
+#define ENETDMAC_CHANCFG_WRAP_EN_SHIFT  3
+#define ENETDMAC_CHANCFG_WRAP_EN_MASK   (1 << ENETDMAC_CHANCFG_WRAP_EN_SHIFT)
+#define ENETDMAC_CHANCFG_FLOWC_EN_SHIFT 4
+#define ENETDMAC_CHANCFG_FLOWC_EN_MASK  (1 << ENETDMAC_CHANCFG_FLOWC_EN_SHIFT)
 
 /* Interrupt Control/Status register */
-#define ENETDMAC_IR_REG(x)              (0x4 + (x) * 0x10)
+#define ENETDMAC_IR_REG                 (0x4)
 #define ENETDMAC_IR_BUFDONE_MASK        (1 << 0)
 #define ENETDMAC_IR_PKTDONE_MASK        (1 << 1)
 #define ENETDMAC_IR_NOTOWNER_MASK       (1 << 2)
 
 /* Interrupt Mask register */
-#define ENETDMAC_IRMASK_REG(x)          (0x8 + (x) * 0x10)
+#define ENETDMAC_IRMASK_REG             (0x8)
 
 /* Maximum Burst Length */
-#define ENETDMAC_MAXBURST_REG(x)        (0xc + (x) * 0x10)
+#define ENETDMAC_MAXBURST_REG           (0xc)
 
 
 /*************************************************************************
@@ -814,16 +841,16 @@
  *************************************************************************/
 
 /* Ring Start Address register */
-#define ENETDMAS_RSTART_REG(x)          ((x) * 0x10)
+#define ENETDMAS_RSTART_REG             (0x0)
 
 /* State Ram Word 2 */
-#define ENETDMAS_SRAM2_REG(x)           (0x4 + (x) * 0x10)
+#define ENETDMAS_SRAM2_REG              (0x4)
 
 /* State Ram Word 3 */
-#define ENETDMAS_SRAM3_REG(x)           (0x8 + (x) * 0x10)
+#define ENETDMAS_SRAM3_REG              (0x8)
 
 /* State Ram Word 4 */
-#define ENETDMAS_SRAM4_REG(x)           (0xc + (x) * 0x10)
+#define ENETDMAS_SRAM4_REG              (0xc)
 
 
 /*************************************************************************