cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/freescale/fs_enet/mac-fec.c

/*
 * Freescale Ethernet controllers
 *
 * Copyright (c) 2005 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/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/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/gfp.h>

#include <asm/irq.h>
#include <linux/uaccess.h>

#ifdef CONFIG_8xx
#include <asm/8xx_immap.h>
#include <asm/pgtable.h>
#include <asm/cpm1.h>
#endif

#include "fs_enet.h"
#include "fec.h"

/*************************************************/

#if defined(CONFIG_CPM1)
/* for a CPM1 __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_in32(addr)	__raw_readl(addr)

#define __fs_in16(addr)	__raw_readw(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 */

#define FW(_fecp, _reg, _v) __fs_out32(&(_fecp)->fec_ ## _reg, (_v))

/* read */

#define FR(_fecp, _reg)	__fs_in32(&(_fecp)->fec_ ## _reg)

/* set bits */

#define FS(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) | (_v))

/* clear bits */

#define FC(_fecp, _reg, _v) FW(_fecp, _reg, FR(_fecp, _reg) & ~(_v))

/*
 * Delay to wait for FEC reset command to complete (in us)
 */

#define FEC_RESET_DELAY		50


static int whack_reset(struct fec __iomem *fecp) { int i; FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET); for (i = 0; i < FEC_RESET_DELAY; i++) { if ((FR(fecp, ecntrl) & FEC_ECNTRL_RESET) == 0) return 0; /* OK */ udelay(1); } return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou6695.65%133.33%
Anatolij Gustschin22.90%133.33%
Scott Wood11.45%133.33%
Total69100.00%3100.00%


static int do_pd_setup(struct fs_enet_private *fep) { struct platform_device *ofdev = to_platform_device(fep->dev); fep->interrupt = irq_of_parse_and_map(ofdev->dev.of_node, 0); if (!fep->interrupt) return -EINVAL; fep->fec.fecp = of_iomap(ofdev->dev.of_node, 0); if (!fep->fcc.fccp) return -EINVAL; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Scott Wood6174.39%116.67%
Pantelis Antoniou1113.41%116.67%
Grant C. Likely89.76%233.33%
Michael Ellerman11.22%116.67%
Thierry Reding11.22%116.67%
Total82100.00%6100.00%

#define FEC_NAPI_EVENT_MSK (FEC_ENET_RXF | FEC_ENET_RXB | FEC_ENET_TXF) #define FEC_EVENT (FEC_ENET_RXF | FEC_ENET_TXF) #define FEC_ERR_EVENT_MSK (FEC_ENET_HBERR | FEC_ENET_BABR | \ FEC_ENET_BABT | FEC_ENET_EBERR)
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->fec.hthi = 0; fep->fec.htlo = 0; fep->ev_napi = FEC_NAPI_EVENT_MSK; fep->ev = FEC_EVENT; fep->ev_err = FEC_ERR_EVENT_MSK; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou6692.96%133.33%
Christophe Leroy57.04%266.67%
Total71100.00%3100.00%


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 __force __iomem *)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; }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou7992.94%150.00%
Scott Wood67.06%150.00%
Total85100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou6793.06%150.00%
Scott Wood56.94%150.00%
Total72100.00%2100.00%


static void cleanup_data(struct net_device *dev) { /* nothing */ }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou12100.00%1100.00%
Total12100.00%1100.00%


static void set_promiscuous_mode(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FS(fecp, r_cntrl, FEC_RCNTRL_PROM); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou3992.86%133.33%
Anatolij Gustschin24.76%133.33%
Scott Wood12.38%133.33%
Total42100.00%3100.00%


static void set_multicast_start(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); fep->fec.hthi = 0; fep->fec.htlo = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou37100.00%1100.00%
Total37100.00%1100.00%


static void set_multicast_one(struct net_device *dev, const u8 *mac) { struct fs_enet_private *fep = netdev_priv(dev); int temp, hash_index, i, j; u32 crc, csrVal; u8 byte, msb; crc = 0xffffffff; for (i = 0; i < 6; i++) { byte = mac[i]; for (j = 0; j < 8; j++) { msb = crc >> 31; crc <<= 1; if (msb ^ (byte & 0x1)) crc ^= FEC_CRC_POLY; byte >>= 1; } } temp = (crc & 0x3f) >> 1; hash_index = ((temp & 0x01) << 4) | ((temp & 0x02) << 2) | ((temp & 0x04)) | ((temp & 0x08) >> 2) | ((temp & 0x10) >> 4); csrVal = 1 << hash_index; if (crc & 1) fep->fec.hthi |= csrVal; else fep->fec.htlo |= csrVal; }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou203100.00%1100.00%
Total203100.00%1100.00%


static void set_multicast_finish(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; /* if all multi or too many multicasts; just enable all */ if ((dev->flags & IFF_ALLMULTI) != 0 || netdev_mc_count(dev) > FEC_MAX_MULTICAST_ADDRS) { fep->fec.hthi = 0xffffffffU; fep->fec.htlo = 0xffffffffU; } FC(fecp, r_cntrl, FEC_RCNTRL_PROM); FW(fecp, grp_hash_table_high, fep->fec.hthi); FW(fecp, grp_hash_table_low, fep->fec.htlo); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou9892.45%120.00%
Jiri Pirko32.83%120.00%
Anatolij Gustschin21.89%120.00%
Andrea Galbusera21.89%120.00%
Scott Wood10.94%120.00%
Total106100.00%5100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou5183.61%133.33%
Jiri Pirko1016.39%266.67%
Total61100.00%3100.00%


static void restart(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; const struct fs_platform_info *fpi = fep->fpi; dma_addr_t rx_bd_base_phys, tx_bd_base_phys; int r; u32 addrhi, addrlo; struct mii_bus *mii = dev->phydev->mdio.bus; struct fec_info* fec_inf = mii->priv; r = whack_reset(fep->fec.fecp); if (r != 0) dev_err(fep->dev, "FEC Reset FAILED!\n"); /* * Set station address. */ addrhi = ((u32) dev->dev_addr[0] << 24) | ((u32) dev->dev_addr[1] << 16) | ((u32) dev->dev_addr[2] << 8) | (u32) dev->dev_addr[3]; addrlo = ((u32) dev->dev_addr[4] << 24) | ((u32) dev->dev_addr[5] << 16); FW(fecp, addr_low, addrhi); FW(fecp, addr_high, addrlo); /* * Reset all multicast. */ FW(fecp, grp_hash_table_high, fep->fec.hthi); FW(fecp, grp_hash_table_low, fep->fec.htlo); /* * Set maximum receive buffer size. */ FW(fecp, r_buff_size, PKT_MAXBLR_SIZE); #ifdef CONFIG_FS_ENET_MPC5121_FEC FW(fecp, r_cntrl, PKT_MAXBUF_SIZE << 16); #else FW(fecp, r_hash, PKT_MAXBUF_SIZE); #endif /* 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; /* * Set receive and transmit descriptor base. */ FW(fecp, r_des_start, rx_bd_base_phys); FW(fecp, x_des_start, tx_bd_base_phys); fs_init_bds(dev); /* * Enable big endian and don't care about SDMA FC. */ #ifdef CONFIG_FS_ENET_MPC5121_FEC FS(fecp, dma_control, 0xC0000000); #else FW(fecp, fun_code, 0x78000000); #endif /* * Set MII speed. */ FW(fecp, mii_speed, fec_inf->mii_speed); /* * Clear any outstanding interrupt. */ FW(fecp, ievent, 0xffc0); #ifndef CONFIG_FS_ENET_MPC5121_FEC FW(fecp, ivec, (virq_to_hw(fep->interrupt) / 2) << 29); FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */ #else /* * Only set MII/RMII mode - do not touch maximum frame length * configured before. */ FS(fecp, r_cntrl, fpi->use_rmii ? FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE); #endif /* * adjust to duplex mode */ if (dev->phydev->duplex) { FC(fecp, r_cntrl, FEC_RCNTRL_DRT); FS(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD enable */ } else { FS(fecp, r_cntrl, FEC_RCNTRL_DRT); FC(fecp, x_cntrl, FEC_TCNTRL_FDEN); /* FD disable */ } /* Restore multicast and promiscuous settings */ set_multicast_list(dev); /* * Enable interrupts we wish to service. */ FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB | FEC_ENET_RXF | FEC_ENET_RXB); /* * And last, enable the transmit and receive processing. */ FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN); FW(fecp, r_des_active, 0x01000000); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou39877.89%18.33%
Anatolij Gustschin5811.35%216.67%
Vitaly Bordug356.85%325.00%
Vladimir Ermakov71.37%18.33%
Christophe Leroy61.17%18.33%
Andrea Galbusera20.39%18.33%
Andrew Lunn20.39%18.33%
Philippe Reynes20.39%18.33%
Scott Wood10.20%18.33%
Total511100.00%12100.00%


static void stop(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); const struct fs_platform_info *fpi = fep->fpi; struct fec __iomem *fecp = fep->fec.fecp; struct fec_info *feci = dev->phydev->mdio.bus->priv; int i; if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0) return; /* already down */ FW(fecp, x_cntrl, 0x01); /* Graceful transmit stop */ for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) && i < FEC_RESET_DELAY; i++) udelay(1); if (i == FEC_RESET_DELAY) dev_warn(fep->dev, "FEC timeout on graceful transmit stop\n"); /* * Disable FEC. Let only MII interrupts. */ FW(fecp, imask, 0); FC(fecp, ecntrl, FEC_ECNTRL_ETHER_EN); fs_cleanup_bds(dev); /* shut down FEC1? that's where the mii bus is */ if (fpi->has_phy) { FS(fecp, r_cntrl, fpi->use_rmii ? FEC_RCNTRL_RMII_MODE : FEC_RCNTRL_MII_MODE); /* MII/RMII enable */ FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN); FW(fecp, ievent, FEC_ENET_MII); FW(fecp, mii_speed, feci->mii_speed); } }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou17882.41%111.11%
Vitaly Bordug198.80%222.22%
Anatolij Gustschin83.70%222.22%
Vladimir Ermakov73.24%111.11%
Andrew Lunn20.93%111.11%
Scott Wood10.46%111.11%
Philippe Reynes10.46%111.11%
Total216100.00%9100.00%


static void napi_clear_event_fs(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FW(fecp, ievent, FEC_NAPI_EVENT_MSK); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou3788.10%125.00%
Christophe Leroy24.76%125.00%
Anatolij Gustschin24.76%125.00%
Scott Wood12.38%125.00%
Total42100.00%4100.00%


static void napi_enable_fs(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FS(fecp, imask, FEC_NAPI_EVENT_MSK); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou3788.10%125.00%
Christophe Leroy24.76%125.00%
Anatolij Gustschin24.76%125.00%
Scott Wood12.38%125.00%
Total42100.00%4100.00%


static void napi_disable_fs(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FC(fecp, imask, FEC_NAPI_EVENT_MSK); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou3480.95%120.00%
Christophe Leroy511.90%240.00%
Anatolij Gustschin24.76%120.00%
Scott Wood12.38%120.00%
Total42100.00%5100.00%


static void rx_bd_done(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FW(fecp, r_des_active, 0x01000000); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou3992.86%133.33%
Anatolij Gustschin24.76%133.33%
Scott Wood12.38%133.33%
Total42100.00%3100.00%


static void tx_kickstart(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FW(fecp, x_des_active, 0x01000000); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou3992.86%133.33%
Anatolij Gustschin24.76%133.33%
Scott Wood12.38%133.33%
Total42100.00%3100.00%


static u32 get_int_events(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; return FR(fecp, ievent) & FR(fecp, imask); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou4593.75%133.33%
Anatolij Gustschin24.17%133.33%
Scott Wood12.08%133.33%
Total48100.00%3100.00%


static void clear_int_events(struct net_device *dev, u32 int_events) { struct fs_enet_private *fep = netdev_priv(dev); struct fec __iomem *fecp = fep->fec.fecp; FW(fecp, ievent, int_events); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou4293.33%133.33%
Anatolij Gustschin24.44%133.33%
Scott Wood12.22%133.33%
Total45100.00%3100.00%


static void ev_error(struct net_device *dev, u32 int_events) { struct fs_enet_private *fep = netdev_priv(dev); dev_warn(fep->dev, "FEC ERROR(s) 0x%x\n", int_events); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou1851.43%150.00%
Anatolij Gustschin1748.57%150.00%
Total35100.00%2100.00%


static int get_regs(struct net_device *dev, void *p, int *sizep) { struct fs_enet_private *fep = netdev_priv(dev); if (*sizep < sizeof(struct fec)) return -EINVAL; memcpy_fromio(p, fep->fec.fecp, sizeof(struct fec)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou5992.19%133.33%
Anatolij Gustschin46.25%133.33%
Scott Wood11.56%133.33%
Total64100.00%3100.00%


static int get_regs_len(struct net_device *dev) { return sizeof(struct fec); }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou1583.33%133.33%
Anatolij Gustschin211.11%133.33%
Scott Wood15.56%133.33%
Total18100.00%3100.00%


static void tx_restart(struct net_device *dev) { /* nothing */ }

Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou1191.67%150.00%
Scott Wood18.33%150.00%
Total12100.00%2100.00%

/*************************************************************************/ const struct fs_ops fs_fec_ops = { .setup_data = setup_data, .cleanup_data = cleanup_data, .set_multicast_list = set_multicast_list, .restart = restart, .stop = stop, .napi_clear_event = napi_clear_event_fs, .napi_enable = napi_enable_fs, .napi_disable = napi_disable_fs, .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, };

Overall Contributors

PersonTokensPropCommitsCommitProp
Pantelis Antoniou196984.51%13.45%
Anatolij Gustschin1094.68%26.90%
Scott Wood873.73%26.90%
Vitaly Bordug592.53%310.34%
Christophe Leroy411.76%310.34%
Vladimir Ermakov140.60%13.45%
Jiri Pirko130.56%310.34%
Grant C. Likely80.34%26.90%
Rob Herring60.26%13.45%
Andrew Lunn40.17%26.90%
Andrea Galbusera40.17%13.45%
Kumar Gala30.13%13.45%
Marcelo Tosatti30.13%13.45%
Philippe Reynes30.13%13.45%
Tejun Heo30.13%13.45%
Linus Torvalds10.04%13.45%
Jochen Friedrich10.04%13.45%
Michael Ellerman10.04%13.45%
Thierry Reding10.04%13.45%
Total2330100.00%29100.00%
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