| /* |
| * Copyright (c) 2012 Qualcomm Atheros, Inc. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/interrupt.h> |
| |
| #include "wil6210.h" |
| #include "trace.h" |
| |
| /** |
| * Theory of operation: |
| * |
| * There is ISR pseudo-cause register, |
| * dma_rgf->DMA_RGF.PSEUDO_CAUSE.PSEUDO_CAUSE |
| * Its bits represents OR'ed bits from 3 real ISR registers: |
| * TX, RX, and MISC. |
| * |
| * Registers may be configured to either "write 1 to clear" or |
| * "clear on read" mode |
| * |
| * When handling interrupt, one have to mask/unmask interrupts for the |
| * real ISR registers, or hardware may malfunction. |
| * |
| */ |
| |
| #define WIL6210_IRQ_DISABLE (0xFFFFFFFFUL) |
| #define WIL6210_IMC_RX BIT_DMA_EP_RX_ICR_RX_DONE |
| #define WIL6210_IMC_TX (BIT_DMA_EP_TX_ICR_TX_DONE | \ |
| BIT_DMA_EP_TX_ICR_TX_DONE_N(0)) |
| #define WIL6210_IMC_MISC (ISR_MISC_FW_READY | \ |
| ISR_MISC_MBOX_EVT | \ |
| ISR_MISC_FW_ERROR) |
| |
| #define WIL6210_IRQ_PSEUDO_MASK (u32)(~(BIT_DMA_PSEUDO_CAUSE_RX | \ |
| BIT_DMA_PSEUDO_CAUSE_TX | \ |
| BIT_DMA_PSEUDO_CAUSE_MISC)) |
| |
| #if defined(CONFIG_WIL6210_ISR_COR) |
| /* configure to Clear-On-Read mode */ |
| #define WIL_ICR_ICC_VALUE (0xFFFFFFFFUL) |
| |
| static inline void wil_icr_clear(u32 x, void __iomem *addr) |
| { |
| } |
| #else /* defined(CONFIG_WIL6210_ISR_COR) */ |
| /* configure to Write-1-to-Clear mode */ |
| #define WIL_ICR_ICC_VALUE (0UL) |
| |
| static inline void wil_icr_clear(u32 x, void __iomem *addr) |
| { |
| iowrite32(x, addr); |
| } |
| #endif /* defined(CONFIG_WIL6210_ISR_COR) */ |
| |
| static inline u32 wil_ioread32_and_clear(void __iomem *addr) |
| { |
| u32 x = ioread32(addr); |
| |
| wil_icr_clear(x, addr); |
| |
| return x; |
| } |
| |
| static void wil6210_mask_irq_tx(struct wil6210_priv *wil) |
| { |
| iowrite32(WIL6210_IRQ_DISABLE, wil->csr + |
| HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, IMS)); |
| } |
| |
| static void wil6210_mask_irq_rx(struct wil6210_priv *wil) |
| { |
| iowrite32(WIL6210_IRQ_DISABLE, wil->csr + |
| HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, IMS)); |
| } |
| |
| static void wil6210_mask_irq_misc(struct wil6210_priv *wil) |
| { |
| iowrite32(WIL6210_IRQ_DISABLE, wil->csr + |
| HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, IMS)); |
| } |
| |
| static void wil6210_mask_irq_pseudo(struct wil6210_priv *wil) |
| { |
| wil_dbg_irq(wil, "%s()\n", __func__); |
| |
| iowrite32(WIL6210_IRQ_DISABLE, wil->csr + |
| HOSTADDR(RGF_DMA_PSEUDO_CAUSE_MASK_SW)); |
| |
| clear_bit(wil_status_irqen, &wil->status); |
| } |
| |
| void wil6210_unmask_irq_tx(struct wil6210_priv *wil) |
| { |
| iowrite32(WIL6210_IMC_TX, wil->csr + |
| HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, IMC)); |
| } |
| |
| void wil6210_unmask_irq_rx(struct wil6210_priv *wil) |
| { |
| iowrite32(WIL6210_IMC_RX, wil->csr + |
| HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, IMC)); |
| } |
| |
| static void wil6210_unmask_irq_misc(struct wil6210_priv *wil) |
| { |
| iowrite32(WIL6210_IMC_MISC, wil->csr + |
| HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, IMC)); |
| } |
| |
| static void wil6210_unmask_irq_pseudo(struct wil6210_priv *wil) |
| { |
| wil_dbg_irq(wil, "%s()\n", __func__); |
| |
| set_bit(wil_status_irqen, &wil->status); |
| |
| iowrite32(WIL6210_IRQ_PSEUDO_MASK, wil->csr + |
| HOSTADDR(RGF_DMA_PSEUDO_CAUSE_MASK_SW)); |
| } |
| |
| void wil6210_disable_irq(struct wil6210_priv *wil) |
| { |
| wil_dbg_irq(wil, "%s()\n", __func__); |
| |
| wil6210_mask_irq_tx(wil); |
| wil6210_mask_irq_rx(wil); |
| wil6210_mask_irq_misc(wil); |
| wil6210_mask_irq_pseudo(wil); |
| } |
| |
| void wil6210_enable_irq(struct wil6210_priv *wil) |
| { |
| wil_dbg_irq(wil, "%s()\n", __func__); |
| |
| iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, ICC)); |
| iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, ICC)); |
| iowrite32(WIL_ICR_ICC_VALUE, wil->csr + HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, ICC)); |
| |
| wil6210_unmask_irq_pseudo(wil); |
| wil6210_unmask_irq_tx(wil); |
| wil6210_unmask_irq_rx(wil); |
| wil6210_unmask_irq_misc(wil); |
| } |
| |
| static irqreturn_t wil6210_irq_rx(int irq, void *cookie) |
| { |
| struct wil6210_priv *wil = cookie; |
| u32 isr = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, ICR)); |
| |
| trace_wil6210_irq_rx(isr); |
| wil_dbg_irq(wil, "ISR RX 0x%08x\n", isr); |
| |
| if (!isr) { |
| wil_err(wil, "spurious IRQ: RX\n"); |
| return IRQ_NONE; |
| } |
| |
| wil6210_mask_irq_rx(wil); |
| |
| if (isr & BIT_DMA_EP_RX_ICR_RX_DONE) { |
| wil_dbg_irq(wil, "RX done\n"); |
| isr &= ~BIT_DMA_EP_RX_ICR_RX_DONE; |
| wil_dbg_txrx(wil, "NAPI schedule\n"); |
| napi_schedule(&wil->napi_rx); |
| } |
| |
| if (isr) |
| wil_err(wil, "un-handled RX ISR bits 0x%08x\n", isr); |
| |
| /* Rx IRQ will be enabled when NAPI processing finished */ |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t wil6210_irq_tx(int irq, void *cookie) |
| { |
| struct wil6210_priv *wil = cookie; |
| u32 isr = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, ICR)); |
| |
| trace_wil6210_irq_tx(isr); |
| wil_dbg_irq(wil, "ISR TX 0x%08x\n", isr); |
| |
| if (!isr) { |
| wil_err(wil, "spurious IRQ: TX\n"); |
| return IRQ_NONE; |
| } |
| |
| wil6210_mask_irq_tx(wil); |
| |
| if (isr & BIT_DMA_EP_TX_ICR_TX_DONE) { |
| wil_dbg_irq(wil, "TX done\n"); |
| napi_schedule(&wil->napi_tx); |
| isr &= ~BIT_DMA_EP_TX_ICR_TX_DONE; |
| /* clear also all VRING interrupts */ |
| isr &= ~(BIT(25) - 1UL); |
| } |
| |
| if (isr) |
| wil_err(wil, "un-handled TX ISR bits 0x%08x\n", isr); |
| |
| /* Tx IRQ will be enabled when NAPI processing finished */ |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void wil_notify_fw_error(struct wil6210_priv *wil) |
| { |
| struct device *dev = &wil_to_ndev(wil)->dev; |
| char *envp[3] = { |
| [0] = "SOURCE=wil6210", |
| [1] = "EVENT=FW_ERROR", |
| [2] = NULL, |
| }; |
| kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); |
| } |
| |
| static void wil_cache_mbox_regs(struct wil6210_priv *wil) |
| { |
| /* make shadow copy of registers that should not change on run time */ |
| wil_memcpy_fromio_32(&wil->mbox_ctl, wil->csr + HOST_MBOX, |
| sizeof(struct wil6210_mbox_ctl)); |
| wil_mbox_ring_le2cpus(&wil->mbox_ctl.rx); |
| wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx); |
| } |
| |
| static irqreturn_t wil6210_irq_misc(int irq, void *cookie) |
| { |
| struct wil6210_priv *wil = cookie; |
| u32 isr = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, ICR)); |
| |
| trace_wil6210_irq_misc(isr); |
| wil_dbg_irq(wil, "ISR MISC 0x%08x\n", isr); |
| |
| if (!isr) { |
| wil_err(wil, "spurious IRQ: MISC\n"); |
| return IRQ_NONE; |
| } |
| |
| wil6210_mask_irq_misc(wil); |
| |
| if (isr & ISR_MISC_FW_ERROR) { |
| wil_err(wil, "Firmware error detected\n"); |
| clear_bit(wil_status_fwready, &wil->status); |
| /* |
| * do not clear @isr here - we do 2-nd part in thread |
| * there, user space get notified, and it should be done |
| * in non-atomic context |
| */ |
| } |
| |
| if (isr & ISR_MISC_FW_READY) { |
| wil_dbg_irq(wil, "IRQ: FW ready\n"); |
| wil_cache_mbox_regs(wil); |
| set_bit(wil_status_reset_done, &wil->status); |
| /** |
| * Actual FW ready indicated by the |
| * WMI_FW_READY_EVENTID |
| */ |
| isr &= ~ISR_MISC_FW_READY; |
| } |
| |
| wil->isr_misc = isr; |
| |
| if (isr) { |
| return IRQ_WAKE_THREAD; |
| } else { |
| wil6210_unmask_irq_misc(wil); |
| return IRQ_HANDLED; |
| } |
| } |
| |
| static irqreturn_t wil6210_irq_misc_thread(int irq, void *cookie) |
| { |
| struct wil6210_priv *wil = cookie; |
| u32 isr = wil->isr_misc; |
| |
| trace_wil6210_irq_misc_thread(isr); |
| wil_dbg_irq(wil, "Thread ISR MISC 0x%08x\n", isr); |
| |
| if (isr & ISR_MISC_FW_ERROR) { |
| wil_notify_fw_error(wil); |
| isr &= ~ISR_MISC_FW_ERROR; |
| } |
| |
| if (isr & ISR_MISC_MBOX_EVT) { |
| wil_dbg_irq(wil, "MBOX event\n"); |
| wmi_recv_cmd(wil); |
| isr &= ~ISR_MISC_MBOX_EVT; |
| } |
| |
| if (isr) |
| wil_err(wil, "un-handled MISC ISR bits 0x%08x\n", isr); |
| |
| wil->isr_misc = 0; |
| |
| wil6210_unmask_irq_misc(wil); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * thread IRQ handler |
| */ |
| static irqreturn_t wil6210_thread_irq(int irq, void *cookie) |
| { |
| struct wil6210_priv *wil = cookie; |
| |
| wil_dbg_irq(wil, "Thread IRQ\n"); |
| /* Discover real IRQ cause */ |
| if (wil->isr_misc) |
| wil6210_irq_misc_thread(irq, cookie); |
| |
| wil6210_unmask_irq_pseudo(wil); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* DEBUG |
| * There is subtle bug in hardware that causes IRQ to raise when it should be |
| * masked. It is quite rare and hard to debug. |
| * |
| * Catch irq issue if it happens and print all I can. |
| */ |
| static int wil6210_debug_irq_mask(struct wil6210_priv *wil, u32 pseudo_cause) |
| { |
| if (!test_bit(wil_status_irqen, &wil->status)) { |
| u32 icm_rx = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, ICM)); |
| u32 icr_rx = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, ICR)); |
| u32 imv_rx = ioread32(wil->csr + |
| HOSTADDR(RGF_DMA_EP_RX_ICR) + |
| offsetof(struct RGF_ICR, IMV)); |
| u32 icm_tx = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, ICM)); |
| u32 icr_tx = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, ICR)); |
| u32 imv_tx = ioread32(wil->csr + |
| HOSTADDR(RGF_DMA_EP_TX_ICR) + |
| offsetof(struct RGF_ICR, IMV)); |
| u32 icm_misc = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, ICM)); |
| u32 icr_misc = wil_ioread32_and_clear(wil->csr + |
| HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, ICR)); |
| u32 imv_misc = ioread32(wil->csr + |
| HOSTADDR(RGF_DMA_EP_MISC_ICR) + |
| offsetof(struct RGF_ICR, IMV)); |
| wil_err(wil, "IRQ when it should be masked: pseudo 0x%08x\n" |
| "Rx icm:icr:imv 0x%08x 0x%08x 0x%08x\n" |
| "Tx icm:icr:imv 0x%08x 0x%08x 0x%08x\n" |
| "Misc icm:icr:imv 0x%08x 0x%08x 0x%08x\n", |
| pseudo_cause, |
| icm_rx, icr_rx, imv_rx, |
| icm_tx, icr_tx, imv_tx, |
| icm_misc, icr_misc, imv_misc); |
| |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static irqreturn_t wil6210_hardirq(int irq, void *cookie) |
| { |
| irqreturn_t rc = IRQ_HANDLED; |
| struct wil6210_priv *wil = cookie; |
| u32 pseudo_cause = ioread32(wil->csr + HOSTADDR(RGF_DMA_PSEUDO_CAUSE)); |
| |
| /** |
| * pseudo_cause is Clear-On-Read, no need to ACK |
| */ |
| if ((pseudo_cause == 0) || ((pseudo_cause & 0xff) == 0xff)) |
| return IRQ_NONE; |
| |
| /* FIXME: IRQ mask debug */ |
| if (wil6210_debug_irq_mask(wil, pseudo_cause)) |
| return IRQ_NONE; |
| |
| trace_wil6210_irq_pseudo(pseudo_cause); |
| wil_dbg_irq(wil, "Pseudo IRQ 0x%08x\n", pseudo_cause); |
| |
| wil6210_mask_irq_pseudo(wil); |
| |
| /* Discover real IRQ cause |
| * There are 2 possible phases for every IRQ: |
| * - hard IRQ handler called right here |
| * - threaded handler called later |
| * |
| * Hard IRQ handler reads and clears ISR. |
| * |
| * If threaded handler requested, hard IRQ handler |
| * returns IRQ_WAKE_THREAD and saves ISR register value |
| * for the threaded handler use. |
| * |
| * voting for wake thread - need at least 1 vote |
| */ |
| if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_RX) && |
| (wil6210_irq_rx(irq, cookie) == IRQ_WAKE_THREAD)) |
| rc = IRQ_WAKE_THREAD; |
| |
| if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_TX) && |
| (wil6210_irq_tx(irq, cookie) == IRQ_WAKE_THREAD)) |
| rc = IRQ_WAKE_THREAD; |
| |
| if ((pseudo_cause & BIT_DMA_PSEUDO_CAUSE_MISC) && |
| (wil6210_irq_misc(irq, cookie) == IRQ_WAKE_THREAD)) |
| rc = IRQ_WAKE_THREAD; |
| |
| /* if thread is requested, it will unmask IRQ */ |
| if (rc != IRQ_WAKE_THREAD) |
| wil6210_unmask_irq_pseudo(wil); |
| |
| return rc; |
| } |
| |
| static int wil6210_request_3msi(struct wil6210_priv *wil, int irq) |
| { |
| int rc; |
| /* |
| * IRQ's are in the following order: |
| * - Tx |
| * - Rx |
| * - Misc |
| */ |
| |
| rc = request_irq(irq, wil6210_irq_tx, IRQF_SHARED, |
| WIL_NAME"_tx", wil); |
| if (rc) |
| return rc; |
| |
| rc = request_irq(irq + 1, wil6210_irq_rx, IRQF_SHARED, |
| WIL_NAME"_rx", wil); |
| if (rc) |
| goto free0; |
| |
| rc = request_threaded_irq(irq + 2, wil6210_irq_misc, |
| wil6210_irq_misc_thread, |
| IRQF_SHARED, WIL_NAME"_misc", wil); |
| if (rc) |
| goto free1; |
| |
| return 0; |
| /* error branch */ |
| free1: |
| free_irq(irq + 1, wil); |
| free0: |
| free_irq(irq, wil); |
| |
| return rc; |
| } |
| |
| int wil6210_init_irq(struct wil6210_priv *wil, int irq) |
| { |
| int rc; |
| if (wil->n_msi == 3) |
| rc = wil6210_request_3msi(wil, irq); |
| else |
| rc = request_threaded_irq(irq, wil6210_hardirq, |
| wil6210_thread_irq, |
| wil->n_msi ? 0 : IRQF_SHARED, |
| WIL_NAME, wil); |
| if (rc) |
| return rc; |
| |
| wil6210_enable_irq(wil); |
| |
| return 0; |
| } |
| |
| void wil6210_fini_irq(struct wil6210_priv *wil, int irq) |
| { |
| wil6210_disable_irq(wil); |
| free_irq(irq, wil); |
| if (wil->n_msi == 3) { |
| free_irq(irq + 1, wil); |
| free_irq(irq + 2, wil); |
| } |
| } |