diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-ict.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-agn-ict.c | 310 |
1 files changed, 0 insertions, 310 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-ict.c b/drivers/net/wireless/iwlwifi/iwl-agn-ict.c deleted file mode 100644 index 9a2eb1e426b5..000000000000 --- a/drivers/net/wireless/iwlwifi/iwl-agn-ict.c +++ /dev/null @@ -1,310 +0,0 @@ -/****************************************************************************** - * - * GPL LICENSE SUMMARY - * - * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. - * - * 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.GPL. - * - * Contact Information: - * Intel Linux Wireless <ilw@linux.intel.com> - * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 - *****************************************************************************/ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/etherdevice.h> -#include <linux/sched.h> -#include <linux/gfp.h> -#include <net/mac80211.h> - -#include "iwl-dev.h" -#include "iwl-core.h" -#include "iwl-agn.h" -#include "iwl-helpers.h" - -#define ICT_COUNT (PAGE_SIZE/sizeof(u32)) - -/* Free dram table */ -void iwl_free_isr_ict(struct iwl_priv *priv) -{ - if (priv->_agn.ict_tbl_vir) { - dma_free_coherent(priv->bus.dev, - (sizeof(u32) * ICT_COUNT) + PAGE_SIZE, - priv->_agn.ict_tbl_vir, - priv->_agn.ict_tbl_dma); - priv->_agn.ict_tbl_vir = NULL; - memset(&priv->_agn.ict_tbl_dma, 0, - sizeof(priv->_agn.ict_tbl_dma)); - memset(&priv->_agn.aligned_ict_tbl_dma, 0, - sizeof(priv->_agn.aligned_ict_tbl_dma)); - } -} - - -/* allocate dram shared table it is a PAGE_SIZE aligned - * also reset all data related to ICT table interrupt. - */ -int iwl_alloc_isr_ict(struct iwl_priv *priv) -{ - - /* allocate shrared data table */ - priv->_agn.ict_tbl_vir = - dma_alloc_coherent(priv->bus.dev, - (sizeof(u32) * ICT_COUNT) + PAGE_SIZE, - &priv->_agn.ict_tbl_dma, GFP_KERNEL); - if (!priv->_agn.ict_tbl_vir) - return -ENOMEM; - - /* align table to PAGE_SIZE boundary */ - priv->_agn.aligned_ict_tbl_dma = ALIGN(priv->_agn.ict_tbl_dma, PAGE_SIZE); - - IWL_DEBUG_ISR(priv, "ict dma addr %Lx dma aligned %Lx diff %d\n", - (unsigned long long)priv->_agn.ict_tbl_dma, - (unsigned long long)priv->_agn.aligned_ict_tbl_dma, - (int)(priv->_agn.aligned_ict_tbl_dma - priv->_agn.ict_tbl_dma)); - - priv->_agn.ict_tbl = priv->_agn.ict_tbl_vir + - (priv->_agn.aligned_ict_tbl_dma - priv->_agn.ict_tbl_dma); - - IWL_DEBUG_ISR(priv, "ict vir addr %p vir aligned %p diff %d\n", - priv->_agn.ict_tbl, priv->_agn.ict_tbl_vir, - (int)(priv->_agn.aligned_ict_tbl_dma - priv->_agn.ict_tbl_dma)); - - /* reset table and index to all 0 */ - memset(priv->_agn.ict_tbl_vir,0, (sizeof(u32) * ICT_COUNT) + PAGE_SIZE); - priv->_agn.ict_index = 0; - - /* add periodic RX interrupt */ - priv->inta_mask |= CSR_INT_BIT_RX_PERIODIC; - return 0; -} - -/* Device is going up inform it about using ICT interrupt table, - * also we need to tell the driver to start using ICT interrupt. - */ -int iwl_reset_ict(struct iwl_priv *priv) -{ - u32 val; - unsigned long flags; - - if (!priv->_agn.ict_tbl_vir) - return 0; - - spin_lock_irqsave(&priv->lock, flags); - iwl_disable_interrupts(priv); - - memset(&priv->_agn.ict_tbl[0], 0, sizeof(u32) * ICT_COUNT); - - val = priv->_agn.aligned_ict_tbl_dma >> PAGE_SHIFT; - - val |= CSR_DRAM_INT_TBL_ENABLE; - val |= CSR_DRAM_INIT_TBL_WRAP_CHECK; - - IWL_DEBUG_ISR(priv, "CSR_DRAM_INT_TBL_REG =0x%X " - "aligned dma address %Lx\n", - val, (unsigned long long)priv->_agn.aligned_ict_tbl_dma); - - iwl_write32(priv, CSR_DRAM_INT_TBL_REG, val); - priv->_agn.use_ict = true; - priv->_agn.ict_index = 0; - iwl_write32(priv, CSR_INT, priv->inta_mask); - iwl_enable_interrupts(priv); - spin_unlock_irqrestore(&priv->lock, flags); - - return 0; -} - -/* Device is going down disable ict interrupt usage */ -void iwl_disable_ict(struct iwl_priv *priv) -{ - unsigned long flags; - - spin_lock_irqsave(&priv->lock, flags); - priv->_agn.use_ict = false; - spin_unlock_irqrestore(&priv->lock, flags); -} - -static irqreturn_t iwl_isr(int irq, void *data) -{ - struct iwl_priv *priv = data; - u32 inta, inta_mask; - unsigned long flags; -#ifdef CONFIG_IWLWIFI_DEBUG - u32 inta_fh; -#endif - if (!priv) - return IRQ_NONE; - - spin_lock_irqsave(&priv->lock, flags); - - /* Disable (but don't clear!) interrupts here to avoid - * back-to-back ISRs and sporadic interrupts from our NIC. - * If we have something to service, the tasklet will re-enable ints. - * If we *don't* have something, we'll re-enable before leaving here. */ - inta_mask = iwl_read32(priv, CSR_INT_MASK); /* just for debug */ - iwl_write32(priv, CSR_INT_MASK, 0x00000000); - - /* Discover which interrupts are active/pending */ - inta = iwl_read32(priv, CSR_INT); - - /* Ignore interrupt if there's nothing in NIC to service. - * This may be due to IRQ shared with another device, - * or due to sporadic interrupts thrown from our NIC. */ - if (!inta) { - IWL_DEBUG_ISR(priv, "Ignore interrupt, inta == 0\n"); - goto none; - } - - if ((inta == 0xFFFFFFFF) || ((inta & 0xFFFFFFF0) == 0xa5a5a5a0)) { - /* Hardware disappeared. It might have already raised - * an interrupt */ - IWL_WARN(priv, "HARDWARE GONE?? INTA == 0x%08x\n", inta); - goto unplugged; - } - -#ifdef CONFIG_IWLWIFI_DEBUG - if (iwl_get_debug_level(priv) & (IWL_DL_ISR)) { - inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS); - IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x, " - "fh 0x%08x\n", inta, inta_mask, inta_fh); - } -#endif - - priv->_agn.inta |= inta; - /* iwl_irq_tasklet() will service interrupts and re-enable them */ - if (likely(inta)) - tasklet_schedule(&priv->irq_tasklet); - else if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta) - iwl_enable_interrupts(priv); - - unplugged: - spin_unlock_irqrestore(&priv->lock, flags); - return IRQ_HANDLED; - - none: - /* re-enable interrupts here since we don't have anything to service. */ - /* only Re-enable if disabled by irq and no schedules tasklet. */ - if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta) - iwl_enable_interrupts(priv); - - spin_unlock_irqrestore(&priv->lock, flags); - return IRQ_NONE; -} - -/* interrupt handler using ict table, with this interrupt driver will - * stop using INTA register to get device's interrupt, reading this register - * is expensive, device will write interrupts in ICT dram table, increment - * index then will fire interrupt to driver, driver will OR all ICT table - * entries from current index up to table entry with 0 value. the result is - * the interrupt we need to service, driver will set the entries back to 0 and - * set index. - */ -irqreturn_t iwl_isr_ict(int irq, void *data) -{ - struct iwl_priv *priv = data; - u32 inta, inta_mask; - u32 val = 0; - unsigned long flags; - - if (!priv) - return IRQ_NONE; - - /* dram interrupt table not set yet, - * use legacy interrupt. - */ - if (!priv->_agn.use_ict) - return iwl_isr(irq, data); - - spin_lock_irqsave(&priv->lock, flags); - - /* Disable (but don't clear!) interrupts here to avoid - * back-to-back ISRs and sporadic interrupts from our NIC. - * If we have something to service, the tasklet will re-enable ints. - * If we *don't* have something, we'll re-enable before leaving here. - */ - inta_mask = iwl_read32(priv, CSR_INT_MASK); /* just for debug */ - iwl_write32(priv, CSR_INT_MASK, 0x00000000); - - - /* Ignore interrupt if there's nothing in NIC to service. - * This may be due to IRQ shared with another device, - * or due to sporadic interrupts thrown from our NIC. */ - if (!priv->_agn.ict_tbl[priv->_agn.ict_index]) { - IWL_DEBUG_ISR(priv, "Ignore interrupt, inta == 0\n"); - goto none; - } - - /* read all entries that not 0 start with ict_index */ - while (priv->_agn.ict_tbl[priv->_agn.ict_index]) { - - val |= le32_to_cpu(priv->_agn.ict_tbl[priv->_agn.ict_index]); - IWL_DEBUG_ISR(priv, "ICT index %d value 0x%08X\n", - priv->_agn.ict_index, - le32_to_cpu(priv->_agn.ict_tbl[priv->_agn.ict_index])); - priv->_agn.ict_tbl[priv->_agn.ict_index] = 0; - priv->_agn.ict_index = iwl_queue_inc_wrap(priv->_agn.ict_index, - ICT_COUNT); - - } - - /* We should not get this value, just ignore it. */ - if (val == 0xffffffff) - val = 0; - - /* - * this is a w/a for a h/w bug. the h/w bug may cause the Rx bit - * (bit 15 before shifting it to 31) to clear when using interrupt - * coalescing. fortunately, bits 18 and 19 stay set when this happens - * so we use them to decide on the real state of the Rx bit. - * In order words, bit 15 is set if bit 18 or bit 19 are set. - */ - if (val & 0xC0000) - val |= 0x8000; - - inta = (0xff & val) | ((0xff00 & val) << 16); - IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x ict 0x%08x\n", - inta, inta_mask, val); - - inta &= priv->inta_mask; - priv->_agn.inta |= inta; - - /* iwl_irq_tasklet() will service interrupts and re-enable them */ - if (likely(inta)) - tasklet_schedule(&priv->irq_tasklet); - else if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta) { - /* Allow interrupt if was disabled by this handler and - * no tasklet was schedules, We should not enable interrupt, - * tasklet will enable it. - */ - iwl_enable_interrupts(priv); - } - - spin_unlock_irqrestore(&priv->lock, flags); - return IRQ_HANDLED; - - none: - /* re-enable interrupts here since we don't have anything to service. - * only Re-enable if disabled by irq. - */ - if (test_bit(STATUS_INT_ENABLED, &priv->status) && !priv->_agn.inta) - iwl_enable_interrupts(priv); - - spin_unlock_irqrestore(&priv->lock, flags); - return IRQ_NONE; -} |
