net: mscc: Add initial Ocelot switch support

Add a driver for Microsemi Ocelot Ethernet switch support.

This makes two modules:
mscc_ocelot_common handles all the common features that doesn't depend on
how the switch is integrated in the SoC. Currently, it handles offloading
bridging to the hardware. ocelot_io.c handles register accesses. This is
unfortunately needed because the register layout is packed and then depends
on the number of ports available on the switch. The register definition
files are automatically generated.

ocelot_board handles the switch integration on the SoC and on the board.

Frame injection and extraction to/from the CPU port is currently done using
register accesses which is quite slow. DMA is possible but the port is not
able to absorb the whole switch bandwidth.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mscc/ocelot_qs.h b/drivers/net/ethernet/mscc/ocelot_qs.h
new file mode 100644
index 000000000000..d18ae726c01d
--- /dev/null
+++ b/drivers/net/ethernet/mscc/ocelot_qs.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/*
+ * Microsemi Ocelot Switch driver
+ *
+ * Copyright (c) 2017 Microsemi Corporation
+ */
+
+#ifndef _MSCC_OCELOT_QS_H_
+#define _MSCC_OCELOT_QS_H_
+
+/* TODO handle BE */
+#define XTR_EOF_0          0x00000080U
+#define XTR_EOF_1          0x01000080U
+#define XTR_EOF_2          0x02000080U
+#define XTR_EOF_3          0x03000080U
+#define XTR_PRUNED         0x04000080U
+#define XTR_ABORT          0x05000080U
+#define XTR_ESCAPE         0x06000080U
+#define XTR_NOT_READY      0x07000080U
+#define XTR_VALID_BYTES(x) (4 - (((x) >> 24) & 3))
+
+#define QS_XTR_GRP_CFG_RSZ                                0x4
+
+#define QS_XTR_GRP_CFG_MODE(x)                            (((x) << 2) & GENMASK(3, 2))
+#define QS_XTR_GRP_CFG_MODE_M                             GENMASK(3, 2)
+#define QS_XTR_GRP_CFG_MODE_X(x)                          (((x) & GENMASK(3, 2)) >> 2)
+#define QS_XTR_GRP_CFG_STATUS_WORD_POS                    BIT(1)
+#define QS_XTR_GRP_CFG_BYTE_SWAP                          BIT(0)
+
+#define QS_XTR_RD_RSZ                                     0x4
+
+#define QS_XTR_FRM_PRUNING_RSZ                            0x4
+
+#define QS_XTR_CFG_DP_WM(x)                               (((x) << 5) & GENMASK(7, 5))
+#define QS_XTR_CFG_DP_WM_M                                GENMASK(7, 5)
+#define QS_XTR_CFG_DP_WM_X(x)                             (((x) & GENMASK(7, 5)) >> 5)
+#define QS_XTR_CFG_SCH_WM(x)                              (((x) << 2) & GENMASK(4, 2))
+#define QS_XTR_CFG_SCH_WM_M                               GENMASK(4, 2)
+#define QS_XTR_CFG_SCH_WM_X(x)                            (((x) & GENMASK(4, 2)) >> 2)
+#define QS_XTR_CFG_OFLW_ERR_STICKY(x)                     ((x) & GENMASK(1, 0))
+#define QS_XTR_CFG_OFLW_ERR_STICKY_M                      GENMASK(1, 0)
+
+#define QS_INJ_GRP_CFG_RSZ                                0x4
+
+#define QS_INJ_GRP_CFG_MODE(x)                            (((x) << 2) & GENMASK(3, 2))
+#define QS_INJ_GRP_CFG_MODE_M                             GENMASK(3, 2)
+#define QS_INJ_GRP_CFG_MODE_X(x)                          (((x) & GENMASK(3, 2)) >> 2)
+#define QS_INJ_GRP_CFG_BYTE_SWAP                          BIT(0)
+
+#define QS_INJ_WR_RSZ                                     0x4
+
+#define QS_INJ_CTRL_RSZ                                   0x4
+
+#define QS_INJ_CTRL_GAP_SIZE(x)                           (((x) << 21) & GENMASK(24, 21))
+#define QS_INJ_CTRL_GAP_SIZE_M                            GENMASK(24, 21)
+#define QS_INJ_CTRL_GAP_SIZE_X(x)                         (((x) & GENMASK(24, 21)) >> 21)
+#define QS_INJ_CTRL_ABORT                                 BIT(20)
+#define QS_INJ_CTRL_EOF                                   BIT(19)
+#define QS_INJ_CTRL_SOF                                   BIT(18)
+#define QS_INJ_CTRL_VLD_BYTES(x)                          (((x) << 16) & GENMASK(17, 16))
+#define QS_INJ_CTRL_VLD_BYTES_M                           GENMASK(17, 16)
+#define QS_INJ_CTRL_VLD_BYTES_X(x)                        (((x) & GENMASK(17, 16)) >> 16)
+
+#define QS_INJ_STATUS_WMARK_REACHED(x)                    (((x) << 4) & GENMASK(5, 4))
+#define QS_INJ_STATUS_WMARK_REACHED_M                     GENMASK(5, 4)
+#define QS_INJ_STATUS_WMARK_REACHED_X(x)                  (((x) & GENMASK(5, 4)) >> 4)
+#define QS_INJ_STATUS_FIFO_RDY(x)                         (((x) << 2) & GENMASK(3, 2))
+#define QS_INJ_STATUS_FIFO_RDY_M                          GENMASK(3, 2)
+#define QS_INJ_STATUS_FIFO_RDY_X(x)                       (((x) & GENMASK(3, 2)) >> 2)
+#define QS_INJ_STATUS_INJ_IN_PROGRESS(x)                  ((x) & GENMASK(1, 0))
+#define QS_INJ_STATUS_INJ_IN_PROGRESS_M                   GENMASK(1, 0)
+
+#define QS_INJ_ERR_RSZ                                    0x4
+
+#define QS_INJ_ERR_ABORT_ERR_STICKY                       BIT(1)
+#define QS_INJ_ERR_WR_ERR_STICKY                          BIT(0)
+
+#endif