1 files changed, 584 insertions, 0 deletions

diff --git a/drivers/net/fs_enet/mac-fcc.c b/drivers/net/fs_enet/mac-fcc.c
new file mode 100644
index 00000000000..7583a9572bc
--- /dev/null
+++ b/drivers/net/fs_enet/mac-fcc.c
@@ -0,0 +1,584 @@
+/*
+ * FCC driver for Motorola MPC82xx (PQ2).
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ *  by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/bitops.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/of_device.h>
+#include <linux/gfp.h>
+
+#include <asm/immap_cpm2.h>
+#include <asm/mpc8260.h>
+#include <asm/cpm2.h>
+
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#include "fs_enet.h"
+
+/*************************************************/
+
+/* FCC access macros */
+
+/* write, read, set bits, clear bits */
+#define W32(_p, _m, _v) out_be32(&(_p)->_m, (_v))
+#define R32(_p, _m)     in_be32(&(_p)->_m)
+#define S32(_p, _m, _v) W32(_p, _m, R32(_p, _m) | (_v))
+#define C32(_p, _m, _v) W32(_p, _m, R32(_p, _m) & ~(_v))
+
+#define W16(_p, _m, _v) out_be16(&(_p)->_m, (_v))
+#define R16(_p, _m)     in_be16(&(_p)->_m)
+#define S16(_p, _m, _v) W16(_p, _m, R16(_p, _m) | (_v))
+#define C16(_p, _m, _v) W16(_p, _m, R16(_p, _m) & ~(_v))
+
+#define W8(_p, _m, _v)  out_8(&(_p)->_m, (_v))
+#define R8(_p, _m)      in_8(&(_p)->_m)
+#define S8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) | (_v))
+#define C8(_p, _m, _v)  W8(_p, _m, R8(_p, _m) & ~(_v))
+
+/*************************************************/
+
+#define FCC_MAX_MULTICAST_ADDRS 64
+
+#define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
+#define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
+#define mk_mii_end              0
+
+#define MAX_CR_CMD_LOOPS        10000
+
+static inline int fcc_cr_cmd(struct fs_enet_private *fep, u32 op)
+{
+        const struct fs_platform_info *fpi = fep->fpi;
+
+        return cpm_command(fpi->cp_command, op);
+}
+
+static int do_pd_setup(struct fs_enet_private *fep)
+{
+        struct platform_device *ofdev = to_platform_device(fep->dev);
+        struct fs_platform_info *fpi = fep->fpi;
+        int ret = -EINVAL;
+
+        fep->interrupt = of_irq_to_resource(ofdev->dev.of_node, 0, NULL);
+        if (fep->interrupt == NO_IRQ)
+                goto out;
+
+        fep->fcc.fccp = of_iomap(ofdev->dev.of_node, 0);
+        if (!fep->fcc.fccp)
+                goto out;
+
+        fep->fcc.ep = of_iomap(ofdev->dev.of_node, 1);
+        if (!fep->fcc.ep)
+                goto out_fccp;
+
+        fep->fcc.fcccp = of_iomap(ofdev->dev.of_node, 2);
+        if (!fep->fcc.fcccp)
+                goto out_ep;
+
+        fep->fcc.mem = (void __iomem *)cpm2_immr;
+        fpi->dpram_offset = cpm_dpalloc(128, 32);
+        if (IS_ERR_VALUE(fpi->dpram_offset)) {
+                ret = fpi->dpram_offset;
+                goto out_fcccp;
+        }
+
+        return 0;
+
+out_fcccp:
+        iounmap(fep->fcc.fcccp);
+out_ep:
+        iounmap(fep->fcc.ep);
+out_fccp:
+        iounmap(fep->fcc.fccp);
+out:
+        return ret;
+}
+
+#define FCC_NAPI_RX_EVENT_MSK   (FCC_ENET_RXF | FCC_ENET_RXB)
+#define FCC_RX_EVENT            (FCC_ENET_RXF)
+#define FCC_TX_EVENT            (FCC_ENET_TXB)
+#define FCC_ERR_EVENT_MSK       (FCC_ENET_TXE)
+
+static int setup_data(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        if (do_pd_setup(fep) != 0)
+                return -EINVAL;
+
+        fep->ev_napi_rx = FCC_NAPI_RX_EVENT_MSK;
+        fep->ev_rx = FCC_RX_EVENT;
+        fep->ev_tx = FCC_TX_EVENT;
+        fep->ev_err = FCC_ERR_EVENT_MSK;
+
+        return 0;
+}
+
+static int allocate_bd(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        const struct fs_platform_info *fpi = fep->fpi;
+
+        fep->ring_base = (void __iomem __force *)dma_alloc_coherent(fep->dev,
+                                            (fpi->tx_ring + fpi->rx_ring) *
+                                            sizeof(cbd_t), &fep->ring_mem_addr,
+                                            GFP_KERNEL);
+        if (fep->ring_base == NULL)
+                return -ENOMEM;
+
+        return 0;
+}
+
+static void free_bd(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        const struct fs_platform_info *fpi = fep->fpi;
+
+        if (fep->ring_base)
+                dma_free_coherent(fep->dev,
+                        (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
+                        (void __force *)fep->ring_base, fep->ring_mem_addr);
+}
+
+static void cleanup_data(struct net_device *dev)
+{
+        /* nothing */
+}
+
+static void set_promiscuous_mode(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        S32(fccp, fcc_fpsmr, FCC_PSMR_PRO);
+}
+
+static void set_multicast_start(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_enet_t __iomem *ep = fep->fcc.ep;
+
+        W32(ep, fen_gaddrh, 0);
+        W32(ep, fen_gaddrl, 0);
+}
+
+static void set_multicast_one(struct net_device *dev, const u8 *mac)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_enet_t __iomem *ep = fep->fcc.ep;
+        u16 taddrh, taddrm, taddrl;
+
+        taddrh = ((u16)mac[5] << 8) | mac[4];
+        taddrm = ((u16)mac[3] << 8) | mac[2];
+        taddrl = ((u16)mac[1] << 8) | mac[0];
+
+        W16(ep, fen_taddrh, taddrh);
+        W16(ep, fen_taddrm, taddrm);
+        W16(ep, fen_taddrl, taddrl);
+        fcc_cr_cmd(fep, CPM_CR_SET_GADDR);
+}
+
+static void set_multicast_finish(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+        fcc_enet_t __iomem *ep = fep->fcc.ep;
+
+        /* clear promiscuous always */
+        C32(fccp, fcc_fpsmr, FCC_PSMR_PRO);
+
+        /* if all multi or too many multicasts; just enable all */
+        if ((dev->flags & IFF_ALLMULTI) != 0 ||
+            netdev_mc_count(dev) > FCC_MAX_MULTICAST_ADDRS) {
+
+                W32(ep, fen_gaddrh, 0xffffffff);
+                W32(ep, fen_gaddrl, 0xffffffff);
+        }
+
+        /* read back */
+        fep->fcc.gaddrh = R32(ep, fen_gaddrh);
+        fep->fcc.gaddrl = R32(ep, fen_gaddrl);
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+        struct netdev_hw_addr *ha;
+
+        if ((dev->flags & IFF_PROMISC) == 0) {
+                set_multicast_start(dev);
+                netdev_for_each_mc_addr(ha, dev)
+                        set_multicast_one(dev, ha->addr);
+                set_multicast_finish(dev);
+        } else
+                set_promiscuous_mode(dev);
+}
+
+static void restart(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        const struct fs_platform_info *fpi = fep->fpi;
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+        fcc_c_t __iomem *fcccp = fep->fcc.fcccp;
+        fcc_enet_t __iomem *ep = fep->fcc.ep;
+        dma_addr_t rx_bd_base_phys, tx_bd_base_phys;
+        u16 paddrh, paddrm, paddrl;
+        const unsigned char *mac;
+        int i;
+
+        C32(fccp, fcc_gfmr, FCC_GFMR_ENR | FCC_GFMR_ENT);
+
+        /* clear everything (slow & steady does it) */
+        for (i = 0; i < sizeof(*ep); i++)
+                out_8((u8 __iomem *)ep + i, 0);
+
+        /* get physical address */
+        rx_bd_base_phys = fep->ring_mem_addr;
+        tx_bd_base_phys = rx_bd_base_phys + sizeof(cbd_t) * fpi->rx_ring;
+
+        /* point to bds */
+        W32(ep, fen_genfcc.fcc_rbase, rx_bd_base_phys);
+        W32(ep, fen_genfcc.fcc_tbase, tx_bd_base_phys);
+
+        /* Set maximum bytes per receive buffer.
+         * It must be a multiple of 32.
+         */
+        W16(ep, fen_genfcc.fcc_mrblr, PKT_MAXBLR_SIZE);
+
+        W32(ep, fen_genfcc.fcc_rstate, (CPMFCR_GBL | CPMFCR_EB) << 24);
+        W32(ep, fen_genfcc.fcc_tstate, (CPMFCR_GBL | CPMFCR_EB) << 24);
+
+        /* Allocate space in the reserved FCC area of DPRAM for the
+         * internal buffers.  No one uses this space (yet), so we
+         * can do this.  Later, we will add resource management for
+         * this area.
+         */
+
+        W16(ep, fen_genfcc.fcc_riptr, fpi->dpram_offset);
+        W16(ep, fen_genfcc.fcc_tiptr, fpi->dpram_offset + 32);
+
+        W16(ep, fen_padptr, fpi->dpram_offset + 64);
+
+        /* fill with special symbol...  */
+        memset_io(fep->fcc.mem + fpi->dpram_offset + 64, 0x88, 32);
+
+        W32(ep, fen_genfcc.fcc_rbptr, 0);
+        W32(ep, fen_genfcc.fcc_tbptr, 0);
+        W32(ep, fen_genfcc.fcc_rcrc, 0);
+        W32(ep, fen_genfcc.fcc_tcrc, 0);
+        W16(ep, fen_genfcc.fcc_res1, 0);
+        W32(ep, fen_genfcc.fcc_res2, 0);
+
+        /* no CAM */
+        W32(ep, fen_camptr, 0);
+
+        /* Set CRC preset and mask */
+        W32(ep, fen_cmask, 0xdebb20e3);
+        W32(ep, fen_cpres, 0xffffffff);
+
+        W32(ep, fen_crcec, 0);          /* CRC Error counter       */
+        W32(ep, fen_alec, 0);           /* alignment error counter */
+        W32(ep, fen_disfc, 0);          /* discard frame counter   */
+        W16(ep, fen_retlim, 15);        /* Retry limit threshold   */
+        W16(ep, fen_pper, 0);           /* Normal persistence      */
+
+        /* set group address */
+        W32(ep, fen_gaddrh, fep->fcc.gaddrh);
+        W32(ep, fen_gaddrl, fep->fcc.gaddrh);
+
+        /* Clear hash filter tables */
+        W32(ep, fen_iaddrh, 0);
+        W32(ep, fen_iaddrl, 0);
+
+        /* Clear the Out-of-sequence TxBD  */
+        W16(ep, fen_tfcstat, 0);
+        W16(ep, fen_tfclen, 0);
+        W32(ep, fen_tfcptr, 0);
+
+        W16(ep, fen_mflr, PKT_MAXBUF_SIZE);     /* maximum frame length register */
+        W16(ep, fen_minflr, PKT_MINBUF_SIZE);   /* minimum frame length register */
+
+        /* set address */
+        mac = dev->dev_addr;
+        paddrh = ((u16)mac[5] << 8) | mac[4];
+        paddrm = ((u16)mac[3] << 8) | mac[2];
+        paddrl = ((u16)mac[1] << 8) | mac[0];
+
+        W16(ep, fen_paddrh, paddrh);
+        W16(ep, fen_paddrm, paddrm);
+        W16(ep, fen_paddrl, paddrl);
+
+        W16(ep, fen_taddrh, 0);
+        W16(ep, fen_taddrm, 0);
+        W16(ep, fen_taddrl, 0);
+
+        W16(ep, fen_maxd1, 1520);       /* maximum DMA1 length */
+        W16(ep, fen_maxd2, 1520);       /* maximum DMA2 length */
+
+        /* Clear stat counters, in case we ever enable RMON */
+        W32(ep, fen_octc, 0);
+        W32(ep, fen_colc, 0);
+        W32(ep, fen_broc, 0);
+        W32(ep, fen_mulc, 0);
+        W32(ep, fen_uspc, 0);
+        W32(ep, fen_frgc, 0);
+        W32(ep, fen_ospc, 0);
+        W32(ep, fen_jbrc, 0);
+        W32(ep, fen_p64c, 0);
+        W32(ep, fen_p65c, 0);
+        W32(ep, fen_p128c, 0);
+        W32(ep, fen_p256c, 0);
+        W32(ep, fen_p512c, 0);
+        W32(ep, fen_p1024c, 0);
+
+        W16(ep, fen_rfthr, 0);  /* Suggested by manual */
+        W16(ep, fen_rfcnt, 0);
+        W16(ep, fen_cftype, 0);
+
+        fs_init_bds(dev);
+
+        /* adjust to speed (for RMII mode) */
+        if (fpi->use_rmii) {
+                if (fep->phydev->speed == 100)
+                        C8(fcccp, fcc_gfemr, 0x20);
+                else
+                        S8(fcccp, fcc_gfemr, 0x20);
+        }
+
+        fcc_cr_cmd(fep, CPM_CR_INIT_TRX);
+
+        /* clear events */
+        W16(fccp, fcc_fcce, 0xffff);
+
+        /* Enable interrupts we wish to service */
+        W16(fccp, fcc_fccm, FCC_ENET_TXE | FCC_ENET_RXF | FCC_ENET_TXB);
+
+        /* Set GFMR to enable Ethernet operating mode */
+        W32(fccp, fcc_gfmr, FCC_GFMR_TCI | FCC_GFMR_MODE_ENET);
+
+        /* set sync/delimiters */
+        W16(fccp, fcc_fdsr, 0xd555);
+
+        W32(fccp, fcc_fpsmr, FCC_PSMR_ENCRC);
+
+        if (fpi->use_rmii)
+                S32(fccp, fcc_fpsmr, FCC_PSMR_RMII);
+
+        /* adjust to duplex mode */
+        if (fep->phydev->duplex)
+                S32(fccp, fcc_fpsmr, FCC_PSMR_FDE | FCC_PSMR_LPB);
+        else
+                C32(fccp, fcc_fpsmr, FCC_PSMR_FDE | FCC_PSMR_LPB);
+
+        /* Restore multicast and promiscuous settings */
+        set_multicast_list(dev);
+
+        S32(fccp, fcc_gfmr, FCC_GFMR_ENR | FCC_GFMR_ENT);
+}
+
+static void stop(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        /* stop ethernet */
+        C32(fccp, fcc_gfmr, FCC_GFMR_ENR | FCC_GFMR_ENT);
+
+        /* clear events */
+        W16(fccp, fcc_fcce, 0xffff);
+
+        /* clear interrupt mask */
+        W16(fccp, fcc_fccm, 0);
+
+        fs_cleanup_bds(dev);
+}
+
+static void napi_clear_rx_event(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        W16(fccp, fcc_fcce, FCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_enable_rx(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        S16(fccp, fcc_fccm, FCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_disable_rx(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        C16(fccp, fcc_fccm, FCC_NAPI_RX_EVENT_MSK);
+}
+
+static void rx_bd_done(struct net_device *dev)
+{
+        /* nothing */
+}
+
+static void tx_kickstart(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        S16(fccp, fcc_ftodr, 0x8000);
+}
+
+static u32 get_int_events(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        return (u32)R16(fccp, fcc_fcce);
+}
+
+static void clear_int_events(struct net_device *dev, u32 int_events)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+
+        W16(fccp, fcc_fcce, int_events & 0xffff);
+}
+
+static void ev_error(struct net_device *dev, u32 int_events)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        dev_warn(fep->dev, "FS_ENET ERROR(s) 0x%x\n", int_events);
+}
+
+static int get_regs(struct net_device *dev, void *p, int *sizep)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        if (*sizep < sizeof(fcc_t) + sizeof(fcc_enet_t) + 1)
+                return -EINVAL;
+
+        memcpy_fromio(p, fep->fcc.fccp, sizeof(fcc_t));
+        p = (char *)p + sizeof(fcc_t);
+
+        memcpy_fromio(p, fep->fcc.ep, sizeof(fcc_enet_t));
+        p = (char *)p + sizeof(fcc_enet_t);
+
+        memcpy_fromio(p, fep->fcc.fcccp, 1);
+        return 0;
+}
+
+static int get_regs_len(struct net_device *dev)
+{
+        return sizeof(fcc_t) + sizeof(fcc_enet_t) + 1;
+}
+
+/* Some transmit errors cause the transmitter to shut
+ * down.  We now issue a restart transmit.
+ * Also, to workaround 8260 device erratum CPM37, we must
+ * disable and then re-enable the transmitterfollowing a
+ * Late Collision, Underrun, or Retry Limit error.
+ * In addition, tbptr may point beyond BDs beyond still marked
+ * as ready due to internal pipelining, so we need to look back
+ * through the BDs and adjust tbptr to point to the last BD
+ * marked as ready.  This may result in some buffers being
+ * retransmitted.
+ */
+static void tx_restart(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        fcc_t __iomem *fccp = fep->fcc.fccp;
+        const struct fs_platform_info *fpi = fep->fpi;
+        fcc_enet_t __iomem *ep = fep->fcc.ep;
+        cbd_t __iomem *curr_tbptr;
+        cbd_t __iomem *recheck_bd;
+        cbd_t __iomem *prev_bd;
+        cbd_t __iomem *last_tx_bd;
+
+        last_tx_bd = fep->tx_bd_base + (fpi->tx_ring * sizeof(cbd_t));
+
+        /* get the current bd held in TBPTR  and scan back from this point */
+        recheck_bd = curr_tbptr = (cbd_t __iomem *)
+                ((R32(ep, fen_genfcc.fcc_tbptr) - fep->ring_mem_addr) +
+                fep->ring_base);
+
+        prev_bd = (recheck_bd == fep->tx_bd_base) ? last_tx_bd : recheck_bd - 1;
+
+        /* Move through the bds in reverse, look for the earliest buffer
+         * that is not ready.  Adjust TBPTR to the following buffer */
+        while ((CBDR_SC(prev_bd) & BD_ENET_TX_READY) != 0) {
+                /* Go back one buffer */
+                recheck_bd = prev_bd;
+
+                /* update the previous buffer */
+                prev_bd = (prev_bd == fep->tx_bd_base) ? last_tx_bd : prev_bd - 1;
+
+                /* We should never see all bds marked as ready, check anyway */
+                if (recheck_bd == curr_tbptr)
+                        break;
+        }
+        /* Now update the TBPTR and dirty flag to the current buffer */
+        W32(ep, fen_genfcc.fcc_tbptr,
+                (uint) (((void *)recheck_bd - fep->ring_base) +
+                fep->ring_mem_addr));
+        fep->dirty_tx = recheck_bd;
+
+        C32(fccp, fcc_gfmr, FCC_GFMR_ENT);
+        udelay(10);
+        S32(fccp, fcc_gfmr, FCC_GFMR_ENT);
+
+        fcc_cr_cmd(fep, CPM_CR_RESTART_TX);
+}
+
+/*************************************************************************/
+
+const struct fs_ops fs_fcc_ops = {
+        .setup_data             = setup_data,
+        .cleanup_data           = cleanup_data,
+        .set_multicast_list     = set_multicast_list,
+        .restart                = restart,
+        .stop                   = stop,
+        .napi_clear_rx_event    = napi_clear_rx_event,
+        .napi_enable_rx         = napi_enable_rx,
+        .napi_disable_rx        = napi_disable_rx,
+        .rx_bd_done             = rx_bd_done,
+        .tx_kickstart           = tx_kickstart,
+        .get_int_events         = get_int_events,
+        .clear_int_events       = clear_int_events,
+        .ev_error               = ev_error,
+        .get_regs               = get_regs,
+        .get_regs_len           = get_regs_len,
+        .tx_restart             = tx_restart,
+        .allocate_bd            = allocate_bd,
+        .free_bd                = free_bd,
+};