iwlwifi: split the drivers for agn and legacy devices 3945/4965

Intel WiFi devices 3945 and 4965 now have their own driver in the folder

	drivers/net/wireless/iwlegacy

Add support to build these drivers independently of the driver for
AGN devices. Selecting the 3945 builds iwl3945.ko and iwl_legacy.ko,
and selecting the 4965 builds iwl4965.ko and iwl_legacy.ko. iwl-legacy.ko
contains code shared between both devices.

The 3945 is an ABG/BG device, with no support for 802.11n. The 4965 is a 2x3
ABGN device.

Signed-off-by: Meenakshi Venkataraman <meenakshi.venkataraman@intel.com>
Acked-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

1 files changed, 545 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlegacy/iwl-io.h b/drivers/net/wireless/iwlegacy/iwl-io.h
new file mode 100644
index 00000000000..5cc5d342914
--- /dev/null
+++ b/drivers/net/wireless/iwlegacy/iwl-io.h
@@ -0,0 +1,545 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
+ *
+ * Portions of this file are derived from the ipw3945 project.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ *****************************************************************************/
+
+#ifndef __iwl_legacy_io_h__
+#define __iwl_legacy_io_h__
+
+#include <linux/io.h>
+
+#include "iwl-dev.h"
+#include "iwl-debug.h"
+#include "iwl-devtrace.h"
+
+/*
+ * IO, register, and NIC memory access functions
+ *
+ * NOTE on naming convention and macro usage for these
+ *
+ * A single _ prefix before a an access function means that no state
+ * check or debug information is printed when that function is called.
+ *
+ * A double __ prefix before an access function means that state is checked
+ * and the current line number and caller function name are printed in addition
+ * to any other debug output.
+ *
+ * The non-prefixed name is the #define that maps the caller into a
+ * #define that provides the caller's name and __LINE__ to the double
+ * prefix version.
+ *
+ * If you wish to call the function without any debug or state checking,
+ * you should use the single _ prefix version (as is used by dependent IO
+ * routines, for example _iwl_legacy_read_direct32 calls the non-check version of
+ * _iwl_legacy_read32.)
+ *
+ * These declarations are *extremely* useful in quickly isolating code deltas
+ * which result in misconfiguration of the hardware I/O.  In combination with
+ * git-bisect and the IO debug level you can quickly determine the specific
+ * commit which breaks the IO sequence to the hardware.
+ *
+ */
+
+static inline void _iwl_legacy_write8(struct iwl_priv *priv, u32 ofs, u8 val)
+{
+        trace_iwlwifi_legacy_dev_iowrite8(priv, ofs, val);
+        iowrite8(val, priv->hw_base + ofs);
+}
+
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline void
+__iwl_legacy_write8(const char *f, u32 l, struct iwl_priv *priv,
+                                 u32 ofs, u8 val)
+{
+        IWL_DEBUG_IO(priv, "write8(0x%08X, 0x%02X) - %s %d\n", ofs, val, f, l);
+        _iwl_legacy_write8(priv, ofs, val);
+}
+#define iwl_write8(priv, ofs, val) \
+        __iwl_legacy_write8(__FILE__, __LINE__, priv, ofs, val)
+#else
+#define iwl_write8(priv, ofs, val) _iwl_legacy_write8(priv, ofs, val)
+#endif
+
+
+static inline void _iwl_legacy_write32(struct iwl_priv *priv, u32 ofs, u32 val)
+{
+        trace_iwlwifi_legacy_dev_iowrite32(priv, ofs, val);
+        iowrite32(val, priv->hw_base + ofs);
+}
+
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline void
+__iwl_legacy_write32(const char *f, u32 l, struct iwl_priv *priv,
+                                 u32 ofs, u32 val)
+{
+        IWL_DEBUG_IO(priv, "write32(0x%08X, 0x%08X) - %s %d\n", ofs, val, f, l);
+        _iwl_legacy_write32(priv, ofs, val);
+}
+#define iwl_write32(priv, ofs, val) \
+        __iwl_legacy_write32(__FILE__, __LINE__, priv, ofs, val)
+#else
+#define iwl_write32(priv, ofs, val) _iwl_legacy_write32(priv, ofs, val)
+#endif
+
+static inline u32 _iwl_legacy_read32(struct iwl_priv *priv, u32 ofs)
+{
+        u32 val = ioread32(priv->hw_base + ofs);
+        trace_iwlwifi_legacy_dev_ioread32(priv, ofs, val);
+        return val;
+}
+
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline u32
+__iwl_legacy_read32(char *f, u32 l, struct iwl_priv *priv, u32 ofs)
+{
+        IWL_DEBUG_IO(priv, "read_direct32(0x%08X) - %s %d\n", ofs, f, l);
+        return _iwl_legacy_read32(priv, ofs);
+}
+#define iwl_read32(priv, ofs) __iwl_legacy_read32(__FILE__, __LINE__, priv, ofs)
+#else
+#define iwl_read32(p, o) _iwl_legacy_read32(p, o)
+#endif
+
+#define IWL_POLL_INTERVAL 10    /* microseconds */
+static inline int
+_iwl_legacy_poll_bit(struct iwl_priv *priv, u32 addr,
+                                u32 bits, u32 mask, int timeout)
+{
+        int t = 0;
+
+        do {
+                if ((_iwl_legacy_read32(priv, addr) & mask) == (bits & mask))
+                        return t;
+                udelay(IWL_POLL_INTERVAL);
+                t += IWL_POLL_INTERVAL;
+        } while (t < timeout);
+
+        return -ETIMEDOUT;
+}
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline int __iwl_legacy_poll_bit(const char *f, u32 l,
+                                 struct iwl_priv *priv, u32 addr,
+                                 u32 bits, u32 mask, int timeout)
+{
+        int ret = _iwl_legacy_poll_bit(priv, addr, bits, mask, timeout);
+        IWL_DEBUG_IO(priv, "poll_bit(0x%08X, 0x%08X, 0x%08X) - %s- %s %d\n",
+                     addr, bits, mask,
+                     unlikely(ret  == -ETIMEDOUT) ? "timeout" : "", f, l);
+        return ret;
+}
+#define iwl_poll_bit(priv, addr, bits, mask, timeout) \
+        __iwl_legacy_poll_bit(__FILE__, __LINE__, priv, addr, \
+        bits, mask, timeout)
+#else
+#define iwl_poll_bit(p, a, b, m, t) _iwl_legacy_poll_bit(p, a, b, m, t)
+#endif
+
+static inline void _iwl_legacy_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        _iwl_legacy_write32(priv, reg, _iwl_legacy_read32(priv, reg) | mask);
+}
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline void __iwl_legacy_set_bit(const char *f, u32 l,
+                                 struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        u32 val = _iwl_legacy_read32(priv, reg) | mask;
+        IWL_DEBUG_IO(priv, "set_bit(0x%08X, 0x%08X) = 0x%08X\n", reg,
+                                                        mask, val);
+        _iwl_legacy_write32(priv, reg, val);
+}
+static inline void iwl_legacy_set_bit(struct iwl_priv *p, u32 r, u32 m)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&p->reg_lock, reg_flags);
+        __iwl_legacy_set_bit(__FILE__, __LINE__, p, r, m);
+        spin_unlock_irqrestore(&p->reg_lock, reg_flags);
+}
+#else
+static inline void iwl_legacy_set_bit(struct iwl_priv *p, u32 r, u32 m)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&p->reg_lock, reg_flags);
+        _iwl_legacy_set_bit(p, r, m);
+        spin_unlock_irqrestore(&p->reg_lock, reg_flags);
+}
+#endif
+
+static inline void
+_iwl_legacy_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        _iwl_legacy_write32(priv, reg, _iwl_legacy_read32(priv, reg) & ~mask);
+}
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline void
+__iwl_legacy_clear_bit(const char *f, u32 l,
+                                   struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        u32 val = _iwl_legacy_read32(priv, reg) & ~mask;
+        IWL_DEBUG_IO(priv, "clear_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
+        _iwl_legacy_write32(priv, reg, val);
+}
+static inline void iwl_legacy_clear_bit(struct iwl_priv *p, u32 r, u32 m)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&p->reg_lock, reg_flags);
+        __iwl_legacy_clear_bit(__FILE__, __LINE__, p, r, m);
+        spin_unlock_irqrestore(&p->reg_lock, reg_flags);
+}
+#else
+static inline void iwl_legacy_clear_bit(struct iwl_priv *p, u32 r, u32 m)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&p->reg_lock, reg_flags);
+        _iwl_legacy_clear_bit(p, r, m);
+        spin_unlock_irqrestore(&p->reg_lock, reg_flags);
+}
+#endif
+
+static inline int _iwl_legacy_grab_nic_access(struct iwl_priv *priv)
+{
+        int ret;
+        u32 val;
+
+        /* this bit wakes up the NIC */
+        _iwl_legacy_set_bit(priv, CSR_GP_CNTRL,
+                                CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+
+        /*
+         * These bits say the device is running, and should keep running for
+         * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
+         * but they do not indicate that embedded SRAM is restored yet;
+         * 3945 and 4965 have volatile SRAM, and must save/restore contents
+         * to/from host DRAM when sleeping/waking for power-saving.
+         * Each direction takes approximately 1/4 millisecond; with this
+         * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
+         * series of register accesses are expected (e.g. reading Event Log),
+         * to keep device from sleeping.
+         *
+         * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
+         * SRAM is okay/restored.  We don't check that here because this call
+         * is just for hardware register access; but GP1 MAC_SLEEP check is a
+         * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
+         *
+         */
+        ret = _iwl_legacy_poll_bit(priv, CSR_GP_CNTRL,
+                           CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
+                           (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
+                            CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
+        if (ret < 0) {
+                val = _iwl_legacy_read32(priv, CSR_GP_CNTRL);
+                IWL_ERR(priv,
+                        "MAC is in deep sleep!.  CSR_GP_CNTRL = 0x%08X\n", val);
+                _iwl_legacy_write32(priv, CSR_RESET,
+                                CSR_RESET_REG_FLAG_FORCE_NMI);
+                return -EIO;
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline int __iwl_legacy_grab_nic_access(const char *f, u32 l,
+                                               struct iwl_priv *priv)
+{
+        IWL_DEBUG_IO(priv, "grabbing nic access - %s %d\n", f, l);
+        return _iwl_legacy_grab_nic_access(priv);
+}
+#define iwl_grab_nic_access(priv) \
+        __iwl_legacy_grab_nic_access(__FILE__, __LINE__, priv)
+#else
+#define iwl_grab_nic_access(priv) \
+        _iwl_legacy_grab_nic_access(priv)
+#endif
+
+static inline void _iwl_legacy_release_nic_access(struct iwl_priv *priv)
+{
+        _iwl_legacy_clear_bit(priv, CSR_GP_CNTRL,
+                        CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+}
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline void __iwl_legacy_release_nic_access(const char *f, u32 l,
+                                            struct iwl_priv *priv)
+{
+
+        IWL_DEBUG_IO(priv, "releasing nic access - %s %d\n", f, l);
+        _iwl_legacy_release_nic_access(priv);
+}
+#define iwl_release_nic_access(priv) \
+        __iwl_legacy_release_nic_access(__FILE__, __LINE__, priv)
+#else
+#define iwl_release_nic_access(priv) \
+        _iwl_legacy_release_nic_access(priv)
+#endif
+
+static inline u32 _iwl_legacy_read_direct32(struct iwl_priv *priv, u32 reg)
+{
+        return _iwl_legacy_read32(priv, reg);
+}
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline u32 __iwl_legacy_read_direct32(const char *f, u32 l,
+                                        struct iwl_priv *priv, u32 reg)
+{
+        u32 value = _iwl_legacy_read_direct32(priv, reg);
+        IWL_DEBUG_IO(priv,
+                        "read_direct32(0x%4X) = 0x%08x - %s %d\n", reg, value,
+                     f, l);
+        return value;
+}
+static inline u32 iwl_legacy_read_direct32(struct iwl_priv *priv, u32 reg)
+{
+        u32 value;
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+        value = __iwl_legacy_read_direct32(__FILE__, __LINE__, priv, reg);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+        return value;
+}
+
+#else
+static inline u32 iwl_legacy_read_direct32(struct iwl_priv *priv, u32 reg)
+{
+        u32 value;
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+        value = _iwl_legacy_read_direct32(priv, reg);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+        return value;
+
+}
+#endif
+
+static inline void _iwl_legacy_write_direct32(struct iwl_priv *priv,
+                                         u32 reg, u32 value)
+{
+        _iwl_legacy_write32(priv, reg, value);
+}
+static inline void
+iwl_legacy_write_direct32(struct iwl_priv *priv, u32 reg, u32 value)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        if (!iwl_grab_nic_access(priv)) {
+                _iwl_legacy_write_direct32(priv, reg, value);
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+
+static inline void iwl_legacy_write_reg_buf(struct iwl_priv *priv,
+                                               u32 reg, u32 len, u32 *values)
+{
+        u32 count = sizeof(u32);
+
+        if ((priv != NULL) && (values != NULL)) {
+                for (; 0 < len; len -= count, reg += count, values++)
+                        iwl_legacy_write_direct32(priv, reg, *values);
+        }
+}
+
+static inline int _iwl_legacy_poll_direct_bit(struct iwl_priv *priv, u32 addr,
+                                       u32 mask, int timeout)
+{
+        int t = 0;
+
+        do {
+                if ((iwl_legacy_read_direct32(priv, addr) & mask) == mask)
+                        return t;
+                udelay(IWL_POLL_INTERVAL);
+                t += IWL_POLL_INTERVAL;
+        } while (t < timeout);
+
+        return -ETIMEDOUT;
+}
+
+#ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
+static inline int __iwl_legacy_poll_direct_bit(const char *f, u32 l,
+                                            struct iwl_priv *priv,
+                                            u32 addr, u32 mask, int timeout)
+{
+        int ret  = _iwl_legacy_poll_direct_bit(priv, addr, mask, timeout);
+
+        if (unlikely(ret == -ETIMEDOUT))
+                IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) - "
+                             "timedout - %s %d\n", addr, mask, f, l);
+        else
+                IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) = 0x%08X "
+                             "- %s %d\n", addr, mask, ret, f, l);
+        return ret;
+}
+#define iwl_poll_direct_bit(priv, addr, mask, timeout) \
+__iwl_legacy_poll_direct_bit(__FILE__, __LINE__, priv, addr, mask, timeout)
+#else
+#define iwl_poll_direct_bit _iwl_legacy_poll_direct_bit
+#endif
+
+static inline u32 _iwl_legacy_read_prph(struct iwl_priv *priv, u32 reg)
+{
+        _iwl_legacy_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
+        rmb();
+        return _iwl_legacy_read_direct32(priv, HBUS_TARG_PRPH_RDAT);
+}
+static inline u32 iwl_legacy_read_prph(struct iwl_priv *priv, u32 reg)
+{
+        unsigned long reg_flags;
+        u32 val;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+        val = _iwl_legacy_read_prph(priv, reg);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+        return val;
+}
+
+static inline void _iwl_legacy_write_prph(struct iwl_priv *priv,
+                                             u32 addr, u32 val)
+{
+        _iwl_legacy_write_direct32(priv, HBUS_TARG_PRPH_WADDR,
+                              ((addr & 0x0000FFFF) | (3 << 24)));
+        wmb();
+        _iwl_legacy_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val);
+}
+
+static inline void
+iwl_legacy_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        if (!iwl_grab_nic_access(priv)) {
+                _iwl_legacy_write_prph(priv, addr, val);
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+
+#define _iwl_legacy_set_bits_prph(priv, reg, mask) \
+_iwl_legacy_write_prph(priv, reg, (_iwl_legacy_read_prph(priv, reg) | mask))
+
+static inline void
+iwl_legacy_set_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+        _iwl_legacy_set_bits_prph(priv, reg, mask);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+
+#define _iwl_legacy_set_bits_mask_prph(priv, reg, bits, mask) \
+_iwl_legacy_write_prph(priv, reg,                               \
+                 ((_iwl_legacy_read_prph(priv, reg) & mask) | bits))
+
+static inline void iwl_legacy_set_bits_mask_prph(struct iwl_priv *priv, u32 reg,
+                                u32 bits, u32 mask)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+        _iwl_legacy_set_bits_mask_prph(priv, reg, bits, mask);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+
+static inline void iwl_legacy_clear_bits_prph(struct iwl_priv
+                                                 *priv, u32 reg, u32 mask)
+{
+        unsigned long reg_flags;
+        u32 val;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+        val = _iwl_legacy_read_prph(priv, reg);
+        _iwl_legacy_write_prph(priv, reg, (val & ~mask));
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+
+static inline u32 iwl_legacy_read_targ_mem(struct iwl_priv *priv, u32 addr)
+{
+        unsigned long reg_flags;
+        u32 value;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        iwl_grab_nic_access(priv);
+
+        _iwl_legacy_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr);
+        rmb();
+        value = _iwl_legacy_read_direct32(priv, HBUS_TARG_MEM_RDAT);
+
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+        return value;
+}
+
+static inline void
+iwl_legacy_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        if (!iwl_grab_nic_access(priv)) {
+                _iwl_legacy_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
+                wmb();
+                _iwl_legacy_write_direct32(priv, HBUS_TARG_MEM_WDAT, val);
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+
+static inline void
+iwl_legacy_write_targ_mem_buf(struct iwl_priv *priv, u32 addr,
+                                          u32 len, u32 *values)
+{
+        unsigned long reg_flags;
+
+        spin_lock_irqsave(&priv->reg_lock, reg_flags);
+        if (!iwl_grab_nic_access(priv)) {
+                _iwl_legacy_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
+                wmb();
+                for (; 0 < len; len -= sizeof(u32), values++)
+                        _iwl_legacy_write_direct32(priv,
+                                        HBUS_TARG_MEM_WDAT, *values);
+
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
+}
+#endif