| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds | 1362 | 47.26% | 4 | 17.39% |
| David Kilroy | 1236 | 42.89% | 5 | 21.74% |
| David Gibson | 224 | 7.77% | 6 | 26.09% |
| Pavel Roskin | 37 | 1.28% | 3 | 13.04% |
| Andrey Borzenkov | 10 | 0.35% | 1 | 4.35% |
| Sebastian Andrzej Siewior | 5 | 0.17% | 1 | 4.35% |
| Al Viro | 5 | 0.17% | 1 | 4.35% |
| Gabriel A. Devenyi | 2 | 0.07% | 1 | 4.35% |
| Harvey Harrison | 1 | 0.03% | 1 | 4.35% |
| Total | 2882 | 23 |
/* hermes.c * * Driver core for the "Hermes" wireless MAC controller, as used in * the Lucent Orinoco and Cabletron RoamAbout cards. It should also * work on the hfa3841 and hfa3842 MAC controller chips used in the * Prism II chipsets. * * This is not a complete driver, just low-level access routines for * the MAC controller itself. * * Based on the prism2 driver from Absolute Value Systems' linux-wlan * project, the Linux wvlan_cs driver, Lucent's HCF-Light * (wvlan_hcf.c) library, and the NetBSD wireless driver (in no * particular order). * * Copyright (C) 2000, David Gibson, Linuxcare Australia. * (C) Copyright David Gibson, IBM Corp. 2001-2003. * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License * at http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See * the License for the specific language governing rights and * limitations under the License. * * Alternatively, the contents of this file may be used under the * terms of the GNU General Public License version 2 (the "GPL"), in * which case the provisions of the GPL are applicable instead of the * above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the MPL, indicate your decision by * deleting the provisions above and replace them with the notice and * other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file * under either the MPL or the GPL. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/delay.h> #include "hermes.h" /* These are maximum timeouts. Most often, card wil react much faster */ #define CMD_BUSY_TIMEOUT (100) /* In iterations of ~1us */ #define CMD_INIT_TIMEOUT (50000) /* in iterations of ~10us */ #define CMD_COMPL_TIMEOUT (20000) /* in iterations of ~10us */ #define ALLOC_COMPL_TIMEOUT (1000) /* in iterations of ~10us */ /* * AUX port access. To unlock the AUX port write the access keys to the * PARAM0-2 registers, then write HERMES_AUX_ENABLE to the HERMES_CONTROL * register. Then read it and make sure it's HERMES_AUX_ENABLED. */ #define HERMES_AUX_ENABLE 0x8000 /* Enable auxiliary port access */ #define HERMES_AUX_DISABLE 0x4000 /* Disable to auxiliary port access */ #define HERMES_AUX_ENABLED 0xC000 /* Auxiliary port is open */ #define HERMES_AUX_DISABLED 0x0000 /* Auxiliary port is closed */ #define HERMES_AUX_PW0 0xFE01 #define HERMES_AUX_PW1 0xDC23 #define HERMES_AUX_PW2 0xBA45 /* HERMES_CMD_DOWNLD */ #define HERMES_PROGRAM_DISABLE (0x0000 | HERMES_CMD_DOWNLD) #define HERMES_PROGRAM_ENABLE_VOLATILE (0x0100 | HERMES_CMD_DOWNLD) #define HERMES_PROGRAM_ENABLE_NON_VOLATILE (0x0200 | HERMES_CMD_DOWNLD) #define HERMES_PROGRAM_NON_VOLATILE (0x0300 | HERMES_CMD_DOWNLD) /* * Debugging helpers */ #define DMSG(stuff...) do {printk(KERN_DEBUG "hermes @ %p: " , hw->iobase); \ printk(stuff); } while (0) #undef HERMES_DEBUG #ifdef HERMES_DEBUG #define DEBUG(lvl, stuff...) if ((lvl) <= HERMES_DEBUG) DMSG(stuff) #else /* ! HERMES_DEBUG */ #define DEBUG(lvl, stuff...) do { } while (0) #endif /* ! HERMES_DEBUG */ static const struct hermes_ops hermes_ops_local; /* * Internal functions */ /* Issue a command to the chip. Waiting for it to complete is the caller's problem. Returns -EBUSY if the command register is busy, 0 on success. Callable from any context. */ static int hermes_issue_cmd(struct hermes *hw, u16 cmd, u16 param0, u16 param1, u16 param2) { int k = CMD_BUSY_TIMEOUT; u16 reg; /* First wait for the command register to unbusy */ reg = hermes_read_regn(hw, CMD); while ((reg & HERMES_CMD_BUSY) && k) { k--; udelay(1); reg = hermes_read_regn(hw, CMD); } if (reg & HERMES_CMD_BUSY) return -EBUSY; hermes_write_regn(hw, PARAM2, param2); hermes_write_regn(hw, PARAM1, param1); hermes_write_regn(hw, PARAM0, param0); hermes_write_regn(hw, CMD, cmd); return 0; } /* * Function definitions */ /* For doing cmds that wipe the magic constant in SWSUPPORT0 */ static int hermes_doicmd_wait(struct hermes *hw, u16 cmd, u16 parm0, u16 parm1, u16 parm2, struct hermes_response *resp) { int err = 0; int k; u16 status, reg; err = hermes_issue_cmd(hw, cmd, parm0, parm1, parm2); if (err) return err; reg = hermes_read_regn(hw, EVSTAT); k = CMD_INIT_TIMEOUT; while ((!(reg & HERMES_EV_CMD)) && k) { k--; udelay(10); reg = hermes_read_regn(hw, EVSTAT); } hermes_write_regn(hw, SWSUPPORT0, HERMES_MAGIC); if (!hermes_present(hw)) { DEBUG(0, "hermes @ 0x%x: Card removed during reset.\n", hw->iobase); err = -ENODEV; goto out; } if (!(reg & HERMES_EV_CMD)) { printk(KERN_ERR "hermes @ %p: " "Timeout waiting for card to reset (reg=0x%04x)!\n", hw->iobase, reg); err = -ETIMEDOUT; goto out; } status = hermes_read_regn(hw, STATUS); if (resp) { resp->status = status; resp->resp0 = hermes_read_regn(hw, RESP0); resp->resp1 = hermes_read_regn(hw, RESP1); resp->resp2 = hermes_read_regn(hw, RESP2); } hermes_write_regn(hw, EVACK, HERMES_EV_CMD); if (status & HERMES_STATUS_RESULT) err = -EIO; out: return err; } void hermes_struct_init(struct hermes *hw, void __iomem *address, int reg_spacing) { hw->iobase = address; hw->reg_spacing = reg_spacing; hw->inten = 0x0; hw->eeprom_pda = false; hw->ops = &hermes_ops_local; } EXPORT_SYMBOL(hermes_struct_init); static int hermes_init(struct hermes *hw) { u16 reg; int err = 0; int k; /* We don't want to be interrupted while resetting the chipset */ hw->inten = 0x0; hermes_write_regn(hw, INTEN, 0); hermes_write_regn(hw, EVACK, 0xffff); /* Normally it's a "can't happen" for the command register to be busy when we go to issue a command because we are serializing all commands. However we want to have some chance of resetting the card even if it gets into a stupid state, so we actually wait to see if the command register will unbusy itself here. */ k = CMD_BUSY_TIMEOUT; reg = hermes_read_regn(hw, CMD); while (k && (reg & HERMES_CMD_BUSY)) { if (reg == 0xffff) /* Special case - the card has probably been removed, so don't wait for the timeout */ return -ENODEV; k--; udelay(1); reg = hermes_read_regn(hw, CMD); } /* No need to explicitly handle the timeout - if we've timed out hermes_issue_cmd() will probably return -EBUSY below */ /* According to the documentation, EVSTAT may contain obsolete event occurrence information. We have to acknowledge it by writing EVACK. */ reg = hermes_read_regn(hw, EVSTAT); hermes_write_regn(hw, EVACK, reg); /* We don't use hermes_docmd_wait here, because the reset wipes the magic constant in SWSUPPORT0 away, and it gets confused */ err = hermes_doicmd_wait(hw, HERMES_CMD_INIT, 0, 0, 0, NULL); return err; } /* Issue a command to the chip, and (busy!) wait for it to * complete. * * Returns: * < 0 on internal error * 0 on success * > 0 on error returned by the firmware * * Callable from any context, but locking is your problem. */ static int hermes_docmd_wait(struct hermes *hw, u16 cmd, u16 parm0, struct hermes_response *resp) { int err; int k; u16 reg; u16 status; err = hermes_issue_cmd(hw, cmd, parm0, 0, 0); if (err) { if (!hermes_present(hw)) { if (net_ratelimit()) printk(KERN_WARNING "hermes @ %p: " "Card removed while issuing command " "0x%04x.\n", hw->iobase, cmd); err = -ENODEV; } else if (net_ratelimit()) printk(KERN_ERR "hermes @ %p: " "Error %d issuing command 0x%04x.\n", hw->iobase, err, cmd); goto out; } reg = hermes_read_regn(hw, EVSTAT); k = CMD_COMPL_TIMEOUT; while ((!(reg & HERMES_EV_CMD)) && k) { k--; udelay(10); reg = hermes_read_regn(hw, EVSTAT); } if (!hermes_present(hw)) { printk(KERN_WARNING "hermes @ %p: Card removed " "while waiting for command 0x%04x completion.\n", hw->iobase, cmd); err = -ENODEV; goto out; } if (!(reg & HERMES_EV_CMD)) { printk(KERN_ERR "hermes @ %p: Timeout waiting for " "command 0x%04x completion.\n", hw->iobase, cmd); err = -ETIMEDOUT; goto out; } status = hermes_read_regn(hw, STATUS); if (resp) { resp->status = status; resp->resp0 = hermes_read_regn(hw, RESP0); resp->resp1 = hermes_read_regn(hw, RESP1); resp->resp2 = hermes_read_regn(hw, RESP2); } hermes_write_regn(hw, EVACK, HERMES_EV_CMD); if (status & HERMES_STATUS_RESULT) err = -EIO; out: return err; } static int hermes_allocate(struct hermes *hw, u16 size, u16 *fid) { int err = 0; int k; u16 reg; if ((size < HERMES_ALLOC_LEN_MIN) || (size > HERMES_ALLOC_LEN_MAX)) return -EINVAL; err = hermes_docmd_wait(hw, HERMES_CMD_ALLOC, size, NULL); if (err) return err; reg = hermes_read_regn(hw, EVSTAT); k = ALLOC_COMPL_TIMEOUT; while ((!(reg & HERMES_EV_ALLOC)) && k) { k--; udelay(10); reg = hermes_read_regn(hw, EVSTAT); } if (!hermes_present(hw)) { printk(KERN_WARNING "hermes @ %p: " "Card removed waiting for frame allocation.\n", hw->iobase); return -ENODEV; } if (!(reg & HERMES_EV_ALLOC)) { printk(KERN_ERR "hermes @ %p: " "Timeout waiting for frame allocation\n", hw->iobase); return -ETIMEDOUT; } *fid = hermes_read_regn(hw, ALLOCFID); hermes_write_regn(hw, EVACK, HERMES_EV_ALLOC); return 0; } /* Set up a BAP to read a particular chunk of data from card's internal buffer. * * Returns: * < 0 on internal failure (errno) * 0 on success * > 0 on error * from firmware * * Callable from any context */ static int hermes_bap_seek(struct hermes *hw, int bap, u16 id, u16 offset) { int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0; int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0; int k; u16 reg; /* Paranoia.. */ if ((offset > HERMES_BAP_OFFSET_MAX) || (offset % 2)) return -EINVAL; k = HERMES_BAP_BUSY_TIMEOUT; reg = hermes_read_reg(hw, oreg); while ((reg & HERMES_OFFSET_BUSY) && k) { k--; udelay(1); reg = hermes_read_reg(hw, oreg); } if (reg & HERMES_OFFSET_BUSY) return -ETIMEDOUT; /* Now we actually set up the transfer */ hermes_write_reg(hw, sreg, id); hermes_write_reg(hw, oreg, offset); /* Wait for the BAP to be ready */ k = HERMES_BAP_BUSY_TIMEOUT; reg = hermes_read_reg(hw, oreg); while ((reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) { k--; udelay(1); reg = hermes_read_reg(hw, oreg); } if (reg != offset) { printk(KERN_ERR "hermes @ %p: BAP%d offset %s: " "reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap, (reg & HERMES_OFFSET_BUSY) ? "timeout" : "error", reg, id, offset); if (reg & HERMES_OFFSET_BUSY) return -ETIMEDOUT; return -EIO; /* error or wrong offset */ } return 0; } /* Read a block of data from the chip's buffer, via the * BAP. Synchronization/serialization is the caller's problem. len * must be even. * * Returns: * < 0 on internal failure (errno) * 0 on success * > 0 on error from firmware */ static int hermes_bap_pread(struct hermes *hw, int bap, void *buf, int len, u16 id, u16 offset) { int dreg = bap ? HERMES_DATA1 : HERMES_DATA0; int err = 0; if ((len < 0) || (len % 2)) return -EINVAL; err = hermes_bap_seek(hw, bap, id, offset); if (err) goto out; /* Actually do the transfer */ hermes_read_words(hw, dreg, buf, len / 2); out: return err; } /* Write a block of data to the chip's buffer, via the * BAP. Synchronization/serialization is the caller's problem. * * Returns: * < 0 on internal failure (errno) * 0 on success * > 0 on error from firmware */ static int hermes_bap_pwrite(struct hermes *hw, int bap, const void *buf, int len, u16 id, u16 offset) { int dreg = bap ? HERMES_DATA1 : HERMES_DATA0; int err = 0; if (len < 0) return -EINVAL; err = hermes_bap_seek(hw, bap, id, offset); if (err) goto out; /* Actually do the transfer */ hermes_write_bytes(hw, dreg, buf, len); out: return err; } /* Read a Length-Type-Value record from the card. * * If length is NULL, we ignore the length read from the card, and * read the entire buffer regardless. This is useful because some of * the configuration records appear to have incorrect lengths in * practice. * * Callable from user or bh context. */ static int hermes_read_ltv(struct hermes *hw, int bap, u16 rid, unsigned bufsize, u16 *length, void *buf) { int err = 0; int dreg = bap ? HERMES_DATA1 : HERMES_DATA0; u16 rlength, rtype; unsigned nwords; if (bufsize % 2) return -EINVAL; err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL); if (err) return err; err = hermes_bap_seek(hw, bap, rid, 0); if (err) return err; rlength = hermes_read_reg(hw, dreg); if (!rlength) return -ENODATA; rtype = hermes_read_reg(hw, dreg); if (length) *length = rlength; if (rtype != rid) printk(KERN_WARNING "hermes @ %p: %s(): " "rid (0x%04x) does not match type (0x%04x)\n", hw->iobase, __func__, rid, rtype); if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize) printk(KERN_WARNING "hermes @ %p: " "Truncating LTV record from %d to %d bytes. " "(rid=0x%04x, len=0x%04x)\n", hw->iobase, HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength); nwords = min((unsigned)rlength - 1, bufsize / 2); hermes_read_words(hw, dreg, buf, nwords); return 0; } static int hermes_write_ltv(struct hermes *hw, int bap, u16 rid, u16 length, const void *value) { int dreg = bap ? HERMES_DATA1 : HERMES_DATA0; int err = 0; unsigned count; if (length == 0) return -EINVAL; err = hermes_bap_seek(hw, bap, rid, 0); if (err) return err; hermes_write_reg(hw, dreg, length); hermes_write_reg(hw, dreg, rid); count = length - 1; hermes_write_bytes(hw, dreg, value, count << 1); err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS | HERMES_CMD_WRITE, rid, NULL); return err; } /*** Hermes AUX control ***/ static inline void hermes_aux_setaddr(struct hermes *hw, u32 addr) { hermes_write_reg(hw, HERMES_AUXPAGE, (u16) (addr >> 7)); hermes_write_reg(hw, HERMES_AUXOFFSET, (u16) (addr & 0x7F)); } static inline int hermes_aux_control(struct hermes *hw, int enabled) { int desired_state = enabled ? HERMES_AUX_ENABLED : HERMES_AUX_DISABLED; int action = enabled ? HERMES_AUX_ENABLE : HERMES_AUX_DISABLE; int i; /* Already open? */ if (hermes_read_reg(hw, HERMES_CONTROL) == desired_state) return 0; hermes_write_reg(hw, HERMES_PARAM0, HERMES_AUX_PW0); hermes_write_reg(hw, HERMES_PARAM1, HERMES_AUX_PW1); hermes_write_reg(hw, HERMES_PARAM2, HERMES_AUX_PW2); hermes_write_reg(hw, HERMES_CONTROL, action); for (i = 0; i < 20; i++) { udelay(10); if (hermes_read_reg(hw, HERMES_CONTROL) == desired_state) return 0; } return -EBUSY; } /*** Hermes programming ***/ /* About to start programming data (Hermes I) * offset is the entry point * * Spectrum_cs' Symbol fw does not require this * wl_lkm Agere fw does * Don't know about intersil */ static int hermesi_program_init(struct hermes *hw, u32 offset) { int err; /* Disable interrupts?*/ /*hw->inten = 0x0;*/ /*hermes_write_regn(hw, INTEN, 0);*/ /*hermes_set_irqmask(hw, 0);*/ /* Acknowledge any outstanding command */ hermes_write_regn(hw, EVACK, 0xFFFF); /* Using init_cmd_wait rather than cmd_wait */ err = hw->ops->init_cmd_wait(hw, 0x0100 | HERMES_CMD_INIT, 0, 0, 0, NULL); if (err) return err; err = hw->ops->init_cmd_wait(hw, 0x0000 | HERMES_CMD_INIT, 0, 0, 0, NULL); if (err) return err; err = hermes_aux_control(hw, 1); pr_debug("AUX enable returned %d\n", err); if (err) return err; pr_debug("Enabling volatile, EP 0x%08x\n", offset); err = hw->ops->init_cmd_wait(hw, HERMES_PROGRAM_ENABLE_VOLATILE, offset & 0xFFFFu, offset >> 16, 0, NULL); pr_debug("PROGRAM_ENABLE returned %d\n", err); return err; } /* Done programming data (Hermes I) * * Spectrum_cs' Symbol fw does not require this * wl_lkm Agere fw does * Don't know about intersil */ static int hermesi_program_end(struct hermes *hw) { struct hermes_response resp; int rc = 0; int err; rc = hw->ops->cmd_wait(hw, HERMES_PROGRAM_DISABLE, 0, &resp); pr_debug("PROGRAM_DISABLE returned %d, " "r0 0x%04x, r1 0x%04x, r2 0x%04x\n", rc, resp.resp0, resp.resp1, resp.resp2); if ((rc == 0) && ((resp.status & HERMES_STATUS_CMDCODE) != HERMES_CMD_DOWNLD)) rc = -EIO; err = hermes_aux_control(hw, 0); pr_debug("AUX disable returned %d\n", err); /* Acknowledge any outstanding command */ hermes_write_regn(hw, EVACK, 0xFFFF); /* Reinitialise, ignoring return */ (void) hw->ops->init_cmd_wait(hw, 0x0000 | HERMES_CMD_INIT, 0, 0, 0, NULL); return rc ? rc : err; } static int hermes_program_bytes(struct hermes *hw, const char *data, u32 addr, u32 len) { /* wl lkm splits the programming into chunks of 2000 bytes. * This restriction appears to come from USB. The PCMCIA * adapters can program the whole lot in one go */ hermes_aux_setaddr(hw, addr); hermes_write_bytes(hw, HERMES_AUXDATA, data, len); return 0; } /* Read PDA from the adapter */ static int hermes_read_pda(struct hermes *hw, __le16 *pda, u32 pda_addr, u16 pda_len) { int ret; u16 pda_size; u16 data_len = pda_len; __le16 *data = pda; if (hw->eeprom_pda) { /* PDA of spectrum symbol is in eeprom */ /* Issue command to read EEPROM */ ret = hw->ops->cmd_wait(hw, HERMES_CMD_READMIF, 0, NULL); if (ret) return ret; } else { /* wl_lkm does not include PDA size in the PDA area. * We will pad the information into pda, so other routines * don't have to be modified */ pda[0] = cpu_to_le16(pda_len - 2); /* Includes CFG_PROD_DATA but not itself */ pda[1] = cpu_to_le16(0x0800); /* CFG_PROD_DATA */ data_len = pda_len - 4; data = pda + 2; } /* Open auxiliary port */ ret = hermes_aux_control(hw, 1); pr_debug("AUX enable returned %d\n", ret); if (ret) return ret; /* Read PDA */ hermes_aux_setaddr(hw, pda_addr); hermes_read_words(hw, HERMES_AUXDATA, data, data_len / 2); /* Close aux port */ ret = hermes_aux_control(hw, 0); pr_debug("AUX disable returned %d\n", ret); /* Check PDA length */ pda_size = le16_to_cpu(pda[0]); pr_debug("Actual PDA length %d, Max allowed %d\n", pda_size, pda_len); if (pda_size > pda_len) return -EINVAL; return 0; } static void hermes_lock_irqsave(spinlock_t *lock, unsigned long *flags) __acquires(lock) { spin_lock_irqsave(lock, *flags); } static void hermes_unlock_irqrestore(spinlock_t *lock, unsigned long *flags) __releases(lock) { spin_unlock_irqrestore(lock, *flags); } static void hermes_lock_irq(spinlock_t *lock) __acquires(lock) { spin_lock_irq(lock); } static void hermes_unlock_irq(spinlock_t *lock) __releases(lock) { spin_unlock_irq(lock); } /* Hermes operations for local buses */ static const struct hermes_ops hermes_ops_local = { .init = hermes_init, .cmd_wait = hermes_docmd_wait, .init_cmd_wait = hermes_doicmd_wait, .allocate = hermes_allocate, .read_ltv = hermes_read_ltv, .read_ltv_pr = hermes_read_ltv, .write_ltv = hermes_write_ltv, .bap_pread = hermes_bap_pread, .bap_pwrite = hermes_bap_pwrite, .read_pda = hermes_read_pda, .program_init = hermesi_program_init, .program_end = hermesi_program_end, .program = hermes_program_bytes, .lock_irqsave = hermes_lock_irqsave, .unlock_irqrestore = hermes_unlock_irqrestore, .lock_irq = hermes_lock_irq, .unlock_irq = hermes_unlock_irq, };
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