[src/trunk]: src/sys/arch/arm/sociox add some more findings about SC2A11 GbE....

[nisimura <nisimura%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4a4c615369fb
branches:  trunk
changeset: 1008484:4a4c615369fb
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Tue Mar 24 02:31:59 2020 +0000

description:
add some more findings about SC2A11 GbE. do some code steamline practice.

diffstat:

 sys/arch/arm/sociox/if_scx.c |  43 ++++++++++++++++++++++++-------------------
 1 files changed, 24 insertions(+), 19 deletions(-)

diffs (120 lines):

diff -r 9983ef2f6b31 -r 4a4c615369fb sys/arch/arm/sociox/if_scx.c
--- a/sys/arch/arm/sociox/if_scx.c      Tue Mar 24 01:56:56 2020 +0000
+++ b/sys/arch/arm/sociox/if_scx.c      Tue Mar 24 02:31:59 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_scx.c,v 1.6 2020/03/23 07:42:00 nisimura Exp $      */
+/*     $NetBSD: if_scx.c,v 1.7 2020/03/24 02:31:59 nisimura Exp $      */
 
 /*-
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -47,10 +47,15 @@
  *   for use. Good to catch multicast. Byte-wise selective match available.
  *   Use to catch { 0x01, 0x00, 0x00 } and/or { 0x33, 0x33 }.
  * - The size of multicast hash filter store is unknown. Might be 256 bit.
+ * - Socionext/Linaro "NetSec" code makes many cut shorts. Some constants
+ *   are left unexplained. The values should be handled via external
+ *   controls like FDT descriptions. Fortunately, Intel/Altera CycloneV PDFs
+ *   describe every detail of "such the instance of" DW EMAC IP and
+ *   most of them are likely applicable to SC2A11 GbE.
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_scx.c,v 1.6 2020/03/23 07:42:00 nisimura Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_scx.c,v 1.7 2020/03/24 02:31:59 nisimura Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -188,7 +193,7 @@
 #define  OMR_TXE       (1U<<13)        /* start Tx DMA engine, 0 to stop */
 #define  OMR_RXE       (1U<<1)         /* start Rx DMA engine, 0 to stop */
 
-static int get_garclk(uint32_t);
+static int get_mdioclk(uint32_t);
 
 /* descriptor format definition */
 struct tdes {
@@ -292,7 +297,7 @@
        void *sc_ih;                    /* interrupt cookie */
        int sc_phy_id;                  /* PHY address */
        int sc_flowflags;               /* 802.3x PAUSE flow control */
-       uint32_t sc_gar;                /* GAR 5:2 clock selection */
+       uint32_t sc_mdclk;              /* GAR 5:2 clock selection */
        uint32_t sc_t0coso;             /* T0_CSUM | T0_SGOL to run */
        int sc_ucodeloaded;             /* ucode for H2M/M2H/PKT */
        int sc_100mii;                  /* 1<<15 RMII/MII, 0 for RGMII */
@@ -577,7 +582,7 @@
 
        phyfreq = 0;
        sc->sc_phy_id = MII_PHY_ANY;
-       sc->sc_gar = get_garclk(phyfreq) << GAR_CTL; /* 5:2 gar control */
+       sc->sc_mdclk = get_mdioclk(phyfreq); /* 5:2 clk control */
 
        sc->sc_flowflags = 0;
 
@@ -1044,11 +1049,11 @@
 mii_readreg(device_t self, int phy, int reg, uint16_t *val)
 {
        struct scx_softc *sc = device_private(self);
-       uint32_t gar;
+       uint32_t miia;
        int error;
 
-       gar = (phy << GAR_PHY) | (reg << GAR_REG) | sc->sc_gar;
-       mac_write(sc, GMACGAR, gar | GAR_BUSY);
+       miia = (phy << GAR_PHY) | (reg << GAR_REG) | sc->sc_mdclk;
+       mac_write(sc, GMACGAR, miia | GAR_BUSY);
        error = spin_waitfor(sc, GMACGAR, GAR_BUSY);
        if (error)
                return error;
@@ -1060,13 +1065,13 @@
 mii_writereg(device_t self, int phy, int reg, uint16_t val)
 {
        struct scx_softc *sc = device_private(self);
-       uint32_t gar;
+       uint32_t miia;
        uint16_t dummy;
        int error;
 
-       gar = (phy << GAR_PHY) | (reg << GAR_REG) | sc->sc_gar;
+       miia = (phy << GAR_PHY) | (reg << GAR_REG) | sc->sc_mdclk;
        mac_write(sc, GMACGDR, val);
-       mac_write(sc, GMACGAR, gar | GAR_IOWR | GAR_BUSY);
+       mac_write(sc, GMACGAR, miia | GAR_IOWR | GAR_BUSY);
        error = spin_waitfor(sc, GMACGAR, GAR_BUSY);
        if (error)
                return error;
@@ -1390,12 +1395,12 @@
 }
 
 static int
-get_garclk(uint32_t freq)
+get_mdioclk(uint32_t freq)
 {
 
        const struct {
                uint16_t freq, bit; /* GAR 5:2 MDIO frequency selection */
-       } garclk[] = {
+       } mdioclk[] = {
                { 35,   2 },    /* 25-35 MHz */
                { 60,   3 },    /* 35-60 MHz */
                { 100,  0 },    /* 60-100 MHz */
@@ -1406,13 +1411,13 @@
        int i;
 
        /* convert MDIO clk to a divisor value */
-       if (freq < garclk[0].freq)
-               return garclk[0].bit;
-       for (i = 1; i < __arraycount(garclk); i++) {
-               if (freq < garclk[i].freq)
-                       return garclk[i-1].bit;
+       if (freq < mdioclk[0].freq)
+               return mdioclk[0].bit;
+       for (i = 1; i < __arraycount(mdioclk); i++) {
+               if (freq < mdioclk[i].freq)
+                       return mdioclk[i-1].bit;
        }
-       return garclk[__arraycount(garclk) - 1].bit;
+       return mdioclk[__arraycount(mdioclk) - 1].bit << GAR_CTL;
 }
 
 static void