1 files changed, 294 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-io.c b/drivers/net/wireless/iwlwifi/iwl-io.c
new file mode 100644
index 000000000000..aa4a90674452
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-io.c
@@ -0,0 +1,294 @@
+/******************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+#include "iwl-io.h"
+
+#define IWL_POLL_INTERVAL 10    /* microseconds */
+
+static inline void __iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        iwl_write32(priv, reg, iwl_read32(priv, reg) | mask);
+}
+
+static inline void __iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        iwl_write32(priv, reg, iwl_read32(priv, reg) & ~mask);
+}
+
+void iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        __iwl_set_bit(priv, reg, mask);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+void iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        __iwl_clear_bit(priv, reg, mask);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+int iwl_poll_bit(struct iwl_priv *priv, u32 addr,
+                 u32 bits, u32 mask, int timeout)
+{
+        int t = 0;
+
+        do {
+                if ((iwl_read32(priv, addr) & mask) == (bits & mask))
+                        return t;
+                udelay(IWL_POLL_INTERVAL);
+                t += IWL_POLL_INTERVAL;
+        } while (t < timeout);
+
+        return -ETIMEDOUT;
+}
+
+int iwl_grab_nic_access_silent(struct iwl_priv *priv)
+{
+        int ret;
+
+        lockdep_assert_held(&priv->reg_lock);
+
+        /* this bit wakes up the NIC */
+        __iwl_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).
+         *
+         * 5000 series and later (including 1000 series) have non-volatile SRAM,
+         * and do not save/restore SRAM when power cycling.
+         */
+        ret = iwl_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) {
+                iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
+                return -EIO;
+        }
+
+        return 0;
+}
+
+int iwl_grab_nic_access(struct iwl_priv *priv)
+{
+        int ret = iwl_grab_nic_access_silent(priv);
+        if (ret) {
+                u32 val = iwl_read32(priv, CSR_GP_CNTRL);
+                IWL_ERR(priv,
+                        "MAC is in deep sleep!. CSR_GP_CNTRL = 0x%08X\n", val);
+        }
+
+        return ret;
+}
+
+void iwl_release_nic_access(struct iwl_priv *priv)
+{
+        lockdep_assert_held(&priv->reg_lock);
+        __iwl_clear_bit(priv, CSR_GP_CNTRL,
+                        CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+}
+
+u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
+{
+        u32 value;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        iwl_grab_nic_access(priv);
+        value = iwl_read32(priv, reg);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+
+        return value;
+}
+
+void iwl_write_direct32(struct iwl_priv *priv, u32 reg, u32 value)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        if (!iwl_grab_nic_access(priv)) {
+                iwl_write32(priv, reg, value);
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+int iwl_poll_direct_bit(struct iwl_priv *priv, u32 addr, u32 mask,
+                        int timeout)
+{
+        int t = 0;
+
+        do {
+                if ((iwl_read_direct32(priv, addr) & mask) == mask)
+                        return t;
+                udelay(IWL_POLL_INTERVAL);
+                t += IWL_POLL_INTERVAL;
+        } while (t < timeout);
+
+        return -ETIMEDOUT;
+}
+
+static inline u32 __iwl_read_prph(struct iwl_priv *priv, u32 reg)
+{
+        iwl_write32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
+        rmb();
+        return iwl_read32(priv, HBUS_TARG_PRPH_RDAT);
+}
+
+static inline void __iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
+{
+        iwl_write32(priv, HBUS_TARG_PRPH_WADDR,
+                    ((addr & 0x0000FFFF) | (3 << 24)));
+        wmb();
+        iwl_write32(priv, HBUS_TARG_PRPH_WDAT, val);
+}
+
+u32 iwl_read_prph(struct iwl_priv *priv, u32 reg)
+{
+        unsigned long flags;
+        u32 val;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        iwl_grab_nic_access(priv);
+        val = __iwl_read_prph(priv, reg);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+        return val;
+}
+
+void iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        if (!iwl_grab_nic_access(priv)) {
+                __iwl_write_prph(priv, addr, val);
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+void iwl_set_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        iwl_grab_nic_access(priv);
+        __iwl_write_prph(priv, reg, __iwl_read_prph(priv, reg) | mask);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+void iwl_set_bits_mask_prph(struct iwl_priv *priv, u32 reg,
+                            u32 bits, u32 mask)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        iwl_grab_nic_access(priv);
+        __iwl_write_prph(priv, reg,
+                         (__iwl_read_prph(priv, reg) & mask) | bits);
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+void iwl_clear_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
+{
+        unsigned long flags;
+        u32 val;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        iwl_grab_nic_access(priv);
+        val = __iwl_read_prph(priv, reg);
+        __iwl_write_prph(priv, reg, (val & ~mask));
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+void _iwl_read_targ_mem_words(struct iwl_priv *priv, u32 addr,
+                              void *buf, int words)
+{
+        unsigned long flags;
+        int offs;
+        u32 *vals = buf;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        iwl_grab_nic_access(priv);
+
+        iwl_write32(priv, HBUS_TARG_MEM_RADDR, addr);
+        rmb();
+
+        for (offs = 0; offs < words; offs++)
+                vals[offs] = iwl_read32(priv, HBUS_TARG_MEM_RDAT);
+
+        iwl_release_nic_access(priv);
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}
+
+u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr)
+{
+        u32 value;
+
+        _iwl_read_targ_mem_words(priv, addr, &value, 1);
+
+        return value;
+}
+
+void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->reg_lock, flags);
+        if (!iwl_grab_nic_access(priv)) {
+                iwl_write32(priv, HBUS_TARG_MEM_WADDR, addr);
+                wmb();
+                iwl_write32(priv, HBUS_TARG_MEM_WDAT, val);
+                iwl_release_nic_access(priv);
+        }
+        spin_unlock_irqrestore(&priv->reg_lock, flags);
+}