Add fs_enet ethernet network driver, for several embedded platforms.

1 files changed, 524 insertions, 0 deletions

diff --git a/drivers/net/fs_enet/mac-scc.c b/drivers/net/fs_enet/mac-scc.c
new file mode 100644
index 000000000000..d8c6e9cadcf5
--- /dev/null
+++ b/drivers/net/fs_enet/mac-scc.c
@@ -0,0 +1,524 @@
+/*
+ * Ethernet on Serial Communications Controller (SCC) driver for Motorola MPC8xx and MPC82xx.
+ *
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/pci.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 <asm/irq.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_8xx
+#include <asm/8xx_immap.h>
+#include <asm/pgtable.h>
+#include <asm/mpc8xx.h>
+#include <asm/commproc.h>
+#endif
+
+#include "fs_enet.h"
+
+/*************************************************/
+
+#if defined(CONFIG_CPM1)
+/* for a 8xx __raw_xxx's are sufficient */
+#define __fs_out32(addr, x)     __raw_writel(x, addr)
+#define __fs_out16(addr, x)     __raw_writew(x, addr)
+#define __fs_out8(addr, x)      __raw_writeb(x, addr)
+#define __fs_in32(addr) __raw_readl(addr)
+#define __fs_in16(addr) __raw_readw(addr)
+#define __fs_in8(addr)  __raw_readb(addr)
+#else
+/* for others play it safe */
+#define __fs_out32(addr, x)     out_be32(addr, x)
+#define __fs_out16(addr, x)     out_be16(addr, x)
+#define __fs_in32(addr) in_be32(addr)
+#define __fs_in16(addr) in_be16(addr)
+#endif
+
+/* write, read, set bits, clear bits */
+#define W32(_p, _m, _v) __fs_out32(&(_p)->_m, (_v))
+#define R32(_p, _m)     __fs_in32(&(_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) __fs_out16(&(_p)->_m, (_v))
+#define R16(_p, _m)     __fs_in16(&(_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)  __fs_out8(&(_p)->_m, (_v))
+#define R8(_p, _m)      __fs_in8(&(_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 SCC_MAX_MULTICAST_ADDRS 64
+
+/*
+ * Delay to wait for SCC reset command to complete (in us) 
+ */
+#define SCC_RESET_DELAY         50
+#define MAX_CR_CMD_LOOPS        10000
+
+static inline int scc_cr_cmd(struct fs_enet_private *fep, u32 op)
+{
+        cpm8xx_t *cpmp = &((immap_t *)fs_enet_immap)->im_cpm;
+        u32 v, ch;
+        int i = 0;
+
+        ch = fep->scc.idx << 2;
+        v = mk_cr_cmd(ch, op);
+        W16(cpmp, cp_cpcr, v | CPM_CR_FLG);
+        for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
+                if ((R16(cpmp, cp_cpcr) & CPM_CR_FLG) == 0)
+                        break;
+
+        if (i >= MAX_CR_CMD_LOOPS) {
+                printk(KERN_ERR "%s(): Not able to issue CPM command\n",
+                        __FUNCTION__);
+                return 1;
+        }
+        return 0;
+}
+
+static int do_pd_setup(struct fs_enet_private *fep)
+{
+        struct platform_device *pdev = to_platform_device(fep->dev);
+        struct resource *r;
+
+        /* Fill out IRQ field */
+        fep->interrupt = platform_get_irq_byname(pdev, "interrupt");
+
+        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+        fep->scc.sccp = (void *)r->start;
+
+        if (fep->scc.sccp == NULL)
+                return -EINVAL;
+
+        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pram");
+        fep->scc.ep = (void *)r->start;
+
+        if (fep->scc.ep == NULL)
+                return -EINVAL;
+
+        return 0;
+}
+
+#define SCC_NAPI_RX_EVENT_MSK   (SCCE_ENET_RXF | SCCE_ENET_RXB)
+#define SCC_RX_EVENT            (SCCE_ENET_RXF)
+#define SCC_TX_EVENT            (SCCE_ENET_TXB)
+#define SCC_ERR_EVENT_MSK       (SCCE_ENET_TXE | SCCE_ENET_BSY)
+
+static int setup_data(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        const struct fs_platform_info *fpi = fep->fpi;
+
+        fep->scc.idx = fs_get_scc_index(fpi->fs_no);
+        if ((unsigned int)fep->fcc.idx > 4)     /* max 4 SCCs */
+                return -EINVAL;
+
+        do_pd_setup(fep);
+
+        fep->scc.hthi = 0;
+        fep->scc.htlo = 0;
+
+        fep->ev_napi_rx = SCC_NAPI_RX_EVENT_MSK;
+        fep->ev_rx = SCC_RX_EVENT;
+        fep->ev_tx = SCC_TX_EVENT;
+        fep->ev_err = SCC_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_mem_addr = cpm_dpalloc((fpi->tx_ring + fpi->rx_ring) *
+                                         sizeof(cbd_t), 8);
+        if (IS_DPERR(fep->ring_mem_addr))
+                return -ENOMEM;
+
+        fep->ring_base = cpm_dpram_addr(fep->ring_mem_addr);
+
+        return 0;
+}
+
+static void free_bd(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        if (fep->ring_base)
+                cpm_dpfree(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);
+        scc_t *sccp = fep->scc.sccp;
+
+        S16(sccp, scc_psmr, SCC_PSMR_PRO);
+}
+
+static void set_multicast_start(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_enet_t *ep = fep->scc.ep;
+
+        W16(ep, sen_gaddr1, 0);
+        W16(ep, sen_gaddr2, 0);
+        W16(ep, sen_gaddr3, 0);
+        W16(ep, sen_gaddr4, 0);
+}
+
+static void set_multicast_one(struct net_device *dev, const u8 * mac)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_enet_t *ep = fep->scc.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, sen_taddrh, taddrh);
+        W16(ep, sen_taddrm, taddrm);
+        W16(ep, sen_taddrl, taddrl);
+        scc_cr_cmd(fep, CPM_CR_SET_GADDR);
+}
+
+static void set_multicast_finish(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+        scc_enet_t *ep = fep->scc.ep;
+
+        /* clear promiscuous always */
+        C16(sccp, scc_psmr, SCC_PSMR_PRO);
+
+        /* if all multi or too many multicasts; just enable all */
+        if ((dev->flags & IFF_ALLMULTI) != 0 ||
+            dev->mc_count > SCC_MAX_MULTICAST_ADDRS) {
+
+                W16(ep, sen_gaddr1, 0xffff);
+                W16(ep, sen_gaddr2, 0xffff);
+                W16(ep, sen_gaddr3, 0xffff);
+                W16(ep, sen_gaddr4, 0xffff);
+        }
+}
+
+static void set_multicast_list(struct net_device *dev)
+{
+        struct dev_mc_list *pmc;
+
+        if ((dev->flags & IFF_PROMISC) == 0) {
+                set_multicast_start(dev);
+                for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next)
+                        set_multicast_one(dev, pmc->dmi_addr);
+                set_multicast_finish(dev);
+        } else
+                set_promiscuous_mode(dev);
+}
+
+/*
+ * This function is called to start or restart the FEC during a link
+ * change.  This only happens when switching between half and full
+ * duplex.
+ */
+static void restart(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+        scc_enet_t *ep = fep->scc.ep;
+        const struct fs_platform_info *fpi = fep->fpi;
+        u16 paddrh, paddrm, paddrl;
+        const unsigned char *mac;
+        int i;
+
+        C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+        /* clear everything (slow & steady does it) */
+        for (i = 0; i < sizeof(*ep); i++)
+                __fs_out8((char *)ep + i, 0);
+
+        /* point to bds */
+        W16(ep, sen_genscc.scc_rbase, fep->ring_mem_addr);
+        W16(ep, sen_genscc.scc_tbase,
+            fep->ring_mem_addr + sizeof(cbd_t) * fpi->rx_ring);
+
+        /* Initialize function code registers for big-endian.
+         */
+        W8(ep, sen_genscc.scc_rfcr, SCC_EB);
+        W8(ep, sen_genscc.scc_tfcr, SCC_EB);
+
+        /* Set maximum bytes per receive buffer.
+         * This appears to be an Ethernet frame size, not the buffer
+         * fragment size.  It must be a multiple of four.
+         */
+        W16(ep, sen_genscc.scc_mrblr, 0x5f0);
+
+        /* Set CRC preset and mask.
+         */
+        W32(ep, sen_cpres, 0xffffffff);
+        W32(ep, sen_cmask, 0xdebb20e3);
+
+        W32(ep, sen_crcec, 0);  /* CRC Error counter */
+        W32(ep, sen_alec, 0);   /* alignment error counter */
+        W32(ep, sen_disfc, 0);  /* discard frame counter */
+
+        W16(ep, sen_pads, 0x8888);      /* Tx short frame pad character */
+        W16(ep, sen_retlim, 15);        /* Retry limit threshold */
+
+        W16(ep, sen_maxflr, 0x5ee);     /* maximum frame length register */
+
+        W16(ep, sen_minflr, PKT_MINBUF_SIZE);   /* minimum frame length register */
+
+        W16(ep, sen_maxd1, 0x000005f0); /* maximum DMA1 length */
+        W16(ep, sen_maxd2, 0x000005f0); /* maximum DMA2 length */
+
+        /* Clear hash tables.
+         */
+        W16(ep, sen_gaddr1, 0);
+        W16(ep, sen_gaddr2, 0);
+        W16(ep, sen_gaddr3, 0);
+        W16(ep, sen_gaddr4, 0);
+        W16(ep, sen_iaddr1, 0);
+        W16(ep, sen_iaddr2, 0);
+        W16(ep, sen_iaddr3, 0);
+        W16(ep, sen_iaddr4, 0);
+
+        /* 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, sen_paddrh, paddrh);
+        W16(ep, sen_paddrm, paddrm);
+        W16(ep, sen_paddrl, paddrl);
+
+        W16(ep, sen_pper, 0);
+        W16(ep, sen_taddrl, 0);
+        W16(ep, sen_taddrm, 0);
+        W16(ep, sen_taddrh, 0);
+
+        fs_init_bds(dev);
+
+        scc_cr_cmd(fep, CPM_CR_INIT_TRX);
+
+        W16(sccp, scc_scce, 0xffff);
+
+        /* Enable interrupts we wish to service. 
+         */
+        W16(sccp, scc_sccm, SCCE_ENET_TXE | SCCE_ENET_RXF | SCCE_ENET_TXB);
+
+        /* Set GSMR_H to enable all normal operating modes.
+         * Set GSMR_L to enable Ethernet to MC68160.
+         */
+        W32(sccp, scc_gsmrh, 0);
+        W32(sccp, scc_gsmrl,
+            SCC_GSMRL_TCI | SCC_GSMRL_TPL_48 | SCC_GSMRL_TPP_10 |
+            SCC_GSMRL_MODE_ENET);
+
+        /* Set sync/delimiters.
+         */
+        W16(sccp, scc_dsr, 0xd555);
+
+        /* Set processing mode.  Use Ethernet CRC, catch broadcast, and
+         * start frame search 22 bit times after RENA.
+         */
+        W16(sccp, scc_psmr, SCC_PSMR_ENCRC | SCC_PSMR_NIB22);
+
+        /* Set full duplex mode if needed */
+        if (fep->duplex)
+                S16(sccp, scc_psmr, SCC_PSMR_LPB | SCC_PSMR_FDE);
+
+        S32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+}
+
+static void stop(struct net_device *dev)        
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+        int i;
+
+        for (i = 0; (R16(sccp, scc_sccm) == 0) && i < SCC_RESET_DELAY; i++)
+                udelay(1);
+
+        if (i == SCC_RESET_DELAY)
+                printk(KERN_WARNING DRV_MODULE_NAME
+                       ": %s SCC timeout on graceful transmit stop\n",
+                       dev->name);
+
+        W16(sccp, scc_sccm, 0);
+        C32(sccp, scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+        fs_cleanup_bds(dev);
+}
+
+static void pre_request_irq(struct net_device *dev, int irq)
+{
+        immap_t *immap = fs_enet_immap;
+        u32 siel;
+
+        /* SIU interrupt */
+        if (irq >= SIU_IRQ0 && irq < SIU_LEVEL7) {
+
+                siel = in_be32(&immap->im_siu_conf.sc_siel);
+                if ((irq & 1) == 0)
+                        siel |= (0x80000000 >> irq);
+                else
+                        siel &= ~(0x80000000 >> (irq & ~1));
+                out_be32(&immap->im_siu_conf.sc_siel, siel);
+        }
+}
+
+static void post_free_irq(struct net_device *dev, int irq)
+{
+        /* nothing */
+}
+
+static void napi_clear_rx_event(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+
+        W16(sccp, scc_scce, SCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_enable_rx(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+
+        S16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
+}
+
+static void napi_disable_rx(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+
+        C16(sccp, scc_sccm, SCC_NAPI_RX_EVENT_MSK);
+}
+
+static void rx_bd_done(struct net_device *dev)
+{
+        /* nothing */
+}
+
+static void tx_kickstart(struct net_device *dev)
+{
+        /* nothing */
+}
+
+static u32 get_int_events(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+
+        return (u32) R16(sccp, scc_scce);
+}
+
+static void clear_int_events(struct net_device *dev, u32 int_events)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+        scc_t *sccp = fep->scc.sccp;
+
+        W16(sccp, scc_scce, int_events & 0xffff);
+}
+
+static void ev_error(struct net_device *dev, u32 int_events)
+{
+        printk(KERN_WARNING DRV_MODULE_NAME
+               ": %s SCC ERROR(s) 0x%x\n", dev->name, 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(scc_t) + sizeof(scc_enet_t))
+                return -EINVAL;
+
+        memcpy_fromio(p, fep->scc.sccp, sizeof(scc_t));
+        p = (char *)p + sizeof(scc_t);
+
+        memcpy_fromio(p, fep->scc.ep, sizeof(scc_enet_t));
+
+        return 0;
+}
+
+static int get_regs_len(struct net_device *dev)
+{
+        return sizeof(scc_t) + sizeof(scc_enet_t);
+}
+
+static void tx_restart(struct net_device *dev)
+{
+        struct fs_enet_private *fep = netdev_priv(dev);
+
+        scc_cr_cmd(fep, CPM_CR_RESTART_TX);
+}
+
+/*************************************************************************/
+
+const struct fs_ops fs_scc_ops = {
+        .setup_data             = setup_data,
+        .cleanup_data           = cleanup_data,
+        .set_multicast_list     = set_multicast_list,
+        .restart                = restart,
+        .stop                   = stop,
+        .pre_request_irq        = pre_request_irq,
+        .post_free_irq          = post_free_irq,
+        .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,
+};