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+/*
+ * Copyright (c) 2005-2011 Atheros Communications Inc.
+ * Copyright (c) 2011-2013 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.
+ */
+
+#ifndef _PCI_H_
+#define _PCI_H_
+
+#include <linux/interrupt.h>
+
+#include "hw.h"
+#include "ce.h"
+
+/* FW dump area */
+#define REG_DUMP_COUNT_QCA988X 60
+
+/*
+ * maximum number of bytes that can be handled atomically by DiagRead/DiagWrite
+ */
+#define DIAG_TRANSFER_LIMIT 2048
+
+/*
+ * maximum number of bytes that can be
+ * handled atomically by DiagRead/DiagWrite
+ */
+#define DIAG_TRANSFER_LIMIT 2048
+
+struct bmi_xfer {
+ struct completion done;
+ bool wait_for_resp;
+ u32 resp_len;
+};
+
+struct ath10k_pci_compl {
+ struct list_head list;
+ int send_or_recv;
+ struct ce_state *ce_state;
+ struct hif_ce_pipe_info *pipe_info;
+ void *transfer_context;
+ unsigned int nbytes;
+ unsigned int transfer_id;
+ unsigned int flags;
+};
+
+/* compl_state.send_or_recv */
+#define HIF_CE_COMPLETE_FREE 0
+#define HIF_CE_COMPLETE_SEND 1
+#define HIF_CE_COMPLETE_RECV 2
+
+/*
+ * PCI-specific Target state
+ *
+ * NOTE: Structure is shared between Host software and Target firmware!
+ *
+ * Much of this may be of interest to the Host so
+ * HOST_INTEREST->hi_interconnect_state points here
+ * (and all members are 32-bit quantities in order to
+ * facilitate Host access). In particular, Host software is
+ * required to initialize pipe_cfg_addr and svc_to_pipe_map.
+ */
+struct pcie_state {
+ /* Pipe configuration Target address */
+ /* NB: ce_pipe_config[CE_COUNT] */
+ u32 pipe_cfg_addr;
+
+ /* Service to pipe map Target address */
+ /* NB: service_to_pipe[PIPE_TO_CE_MAP_CN] */
+ u32 svc_to_pipe_map;
+
+ /* number of MSI interrupts requested */
+ u32 msi_requested;
+
+ /* number of MSI interrupts granted */
+ u32 msi_granted;
+
+ /* Message Signalled Interrupt address */
+ u32 msi_addr;
+
+ /* Base data */
+ u32 msi_data;
+
+ /*
+ * Data for firmware interrupt;
+ * MSI data for other interrupts are
+ * in various SoC registers
+ */
+ u32 msi_fw_intr_data;
+
+ /* PCIE_PWR_METHOD_* */
+ u32 power_mgmt_method;
+
+ /* PCIE_CONFIG_FLAG_* */
+ u32 config_flags;
+};
+
+/* PCIE_CONFIG_FLAG definitions */
+#define PCIE_CONFIG_FLAG_ENABLE_L1 0x0000001
+
+/* Host software's Copy Engine configuration. */
+#define CE_ATTR_FLAGS 0
+
+/*
+ * Configuration information for a Copy Engine pipe.
+ * Passed from Host to Target during startup (one per CE).
+ *
+ * NOTE: Structure is shared between Host software and Target firmware!
+ */
+struct ce_pipe_config {
+ u32 pipenum;
+ u32 pipedir;
+ u32 nentries;
+ u32 nbytes_max;
+ u32 flags;
+ u32 reserved;
+};
+
+/*
+ * Directions for interconnect pipe configuration.
+ * These definitions may be used during configuration and are shared
+ * between Host and Target.
+ *
+ * Pipe Directions are relative to the Host, so PIPEDIR_IN means
+ * "coming IN over air through Target to Host" as with a WiFi Rx operation.
+ * Conversely, PIPEDIR_OUT means "going OUT from Host through Target over air"
+ * as with a WiFi Tx operation. This is somewhat awkward for the "middle-man"
+ * Target since things that are "PIPEDIR_OUT" are coming IN to the Target
+ * over the interconnect.
+ */
+#define PIPEDIR_NONE 0
+#define PIPEDIR_IN 1 /* Target-->Host, WiFi Rx direction */
+#define PIPEDIR_OUT 2 /* Host->Target, WiFi Tx direction */
+#define PIPEDIR_INOUT 3 /* bidirectional */
+
+/* Establish a mapping between a service/direction and a pipe. */
+struct service_to_pipe {
+ u32 service_id;
+ u32 pipedir;
+ u32 pipenum;
+};
+
+enum ath10k_pci_features {
+ ATH10K_PCI_FEATURE_MSI_X = 0,
+ ATH10K_PCI_FEATURE_HW_1_0_WARKAROUND = 1,
+
+ /* keep last */
+ ATH10K_PCI_FEATURE_COUNT
+};
+
+/* Per-pipe state. */
+struct hif_ce_pipe_info {
+ /* Handle of underlying Copy Engine */
+ struct ce_state *ce_hdl;
+
+ /* Our pipe number; facilitiates use of pipe_info ptrs. */
+ u8 pipe_num;
+
+ /* Convenience back pointer to hif_ce_state. */
+ struct ath10k *hif_ce_state;
+
+ size_t buf_sz;
+
+ /* protects compl_free and num_send_allowed */
+ spinlock_t pipe_lock;
+
+ /* List of free CE completion slots */
+ struct list_head compl_free;
+
+ /* Limit the number of outstanding send requests. */
+ int num_sends_allowed;
+
+ struct ath10k_pci *ar_pci;
+ struct tasklet_struct intr;
+};
+
+struct ath10k_pci {
+ struct pci_dev *pdev;
+ struct device *dev;
+ struct ath10k *ar;
+ void __iomem *mem;
+ int cacheline_sz;
+
+ DECLARE_BITMAP(features, ATH10K_PCI_FEATURE_COUNT);
+
+ /*
+ * Number of MSI interrupts granted, 0 --> using legacy PCI line
+ * interrupts.
+ */
+ int num_msi_intrs;
+
+ struct tasklet_struct intr_tq;
+ struct tasklet_struct msi_fw_err;
+
+ /* Number of Copy Engines supported */
+ unsigned int ce_count;
+
+ int started;
+
+ atomic_t keep_awake_count;
+ bool verified_awake;
+
+ /* List of CE completions to be processed */
+ struct list_head compl_process;
+
+ /* protects compl_processing and compl_process */
+ spinlock_t compl_lock;
+
+ bool compl_processing;
+
+ struct hif_ce_pipe_info pipe_info[CE_COUNT_MAX];
+
+ struct ath10k_hif_cb msg_callbacks_current;
+
+ /* Target address used to signal a pending firmware event */
+ u32 fw_indicator_address;
+
+ /* Copy Engine used for Diagnostic Accesses */
+ struct ce_state *ce_diag;
+
+ /* FIXME: document what this really protects */
+ spinlock_t ce_lock;
+
+ /* Map CE id to ce_state */
+ struct ce_state *ce_id_to_state[CE_COUNT_MAX];
+
+ /* makes sure that dummy reads are atomic */
+ spinlock_t hw_v1_workaround_lock;
+};
+
+static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar)
+{
+ return ar->hif.priv;
+}
+
+static inline u32 ath10k_pci_reg_read32(void __iomem *mem, u32 addr)
+{
+ return ioread32(mem + PCIE_LOCAL_BASE_ADDRESS + addr);
+}
+
+static inline void ath10k_pci_reg_write32(void __iomem *mem, u32 addr, u32 val)
+{
+ iowrite32(val, mem + PCIE_LOCAL_BASE_ADDRESS + addr);
+}
+
+#define ATH_PCI_RESET_WAIT_MAX 10 /* ms */
+#define PCIE_WAKE_TIMEOUT 5000 /* 5ms */
+
+#define BAR_NUM 0
+
+#define CDC_WAR_MAGIC_STR 0xceef0000
+#define CDC_WAR_DATA_CE 4
+
+/*
+ * TODO: Should be a function call specific to each Target-type.
+ * This convoluted macro converts from Target CPU Virtual Address Space to CE
+ * Address Space. As part of this process, we conservatively fetch the current
+ * PCIE_BAR. MOST of the time, this should match the upper bits of PCI space
+ * for this device; but that's not guaranteed.
+ */
+#define TARG_CPU_SPACE_TO_CE_SPACE(ar, pci_addr, addr) \
+ (((ioread32((pci_addr)+(SOC_CORE_BASE_ADDRESS| \
+ CORE_CTRL_ADDRESS)) & 0x7ff) << 21) | \
+ 0x100000 | ((addr) & 0xfffff))
+
+/* Wait up to this many Ms for a Diagnostic Access CE operation to complete */
+#define DIAG_ACCESS_CE_TIMEOUT_MS 10
+
+/*
+ * This API allows the Host to access Target registers directly
+ * and relatively efficiently over PCIe.
+ * This allows the Host to avoid extra overhead associated with
+ * sending a message to firmware and waiting for a response message
+ * from firmware, as is done on other interconnects.
+ *
+ * Yet there is some complexity with direct accesses because the
+ * Target's power state is not known a priori. The Host must issue
+ * special PCIe reads/writes in order to explicitly wake the Target
+ * and to verify that it is awake and will remain awake.
+ *
+ * Usage:
+ *
+ * Use ath10k_pci_read32 and ath10k_pci_write32 to access Target space.
+ * These calls must be bracketed by ath10k_pci_wake and
+ * ath10k_pci_sleep. A single BEGIN/END pair is adequate for
+ * multiple READ/WRITE operations.
+ *
+ * Use ath10k_pci_wake to put the Target in a state in
+ * which it is legal for the Host to directly access it. This
+ * may involve waking the Target from a low power state, which
+ * may take up to 2Ms!
+ *
+ * Use ath10k_pci_sleep to tell the Target that as far as
+ * this code path is concerned, it no longer needs to remain
+ * directly accessible. BEGIN/END is under a reference counter;
+ * multiple code paths may issue BEGIN/END on a single targid.
+ */
+static inline void ath10k_pci_write32(struct ath10k *ar, u32 offset,
+ u32 value)
+{
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+ void __iomem *addr = ar_pci->mem;
+
+ if (test_bit(ATH10K_PCI_FEATURE_HW_1_0_WARKAROUND, ar_pci->features)) {
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&ar_pci->hw_v1_workaround_lock, irq_flags);
+
+ ioread32(addr+offset+4); /* 3rd read prior to write */
+ ioread32(addr+offset+4); /* 2nd read prior to write */
+ ioread32(addr+offset+4); /* 1st read prior to write */
+ iowrite32(value, addr+offset);
+
+ spin_unlock_irqrestore(&ar_pci->hw_v1_workaround_lock,
+ irq_flags);
+ } else {
+ iowrite32(value, addr+offset);
+ }
+}
+
+static inline u32 ath10k_pci_read32(struct ath10k *ar, u32 offset)
+{
+ struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
+
+ return ioread32(ar_pci->mem + offset);
+}
+
+extern unsigned int ath10k_target_ps;
+
+void ath10k_do_pci_wake(struct ath10k *ar);
+void ath10k_do_pci_sleep(struct ath10k *ar);
+
+static inline void ath10k_pci_wake(struct ath10k *ar)
+{
+ if (ath10k_target_ps)
+ ath10k_do_pci_wake(ar);
+}
+
+static inline void ath10k_pci_sleep(struct ath10k *ar)
+{
+ if (ath10k_target_ps)
+ ath10k_do_pci_sleep(ar);
+}
+
+#endif /* _PCI_H_ */
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com> --- drivers/net/wireless/ath/ath10k/pci.h | 355 +++++++++++++++++++++++++++++++++ 1 file changed, 355 insertions(+) create mode 100644 drivers/net/wireless/ath/ath10k/pci.h -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html