drivers/net/wireless/ath/ath10k/pci.h

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #ifndef _PCI_H_
  19 #define _PCI_H_
  20
  21 #include <linux/interrupt.h>
  22
  23 #include "hw.h"
  24 #include "ce.h"
  25 #include "ahb.h"
  26
  27 /*
  28  * maximum number of bytes that can be
  29  * handled atomically by DiagRead/DiagWrite
  30  */
  31 #define DIAG_TRANSFER_LIMIT 2048
  32
  33 struct bmi_xfer {
  34         bool tx_done;
  35         bool rx_done;
  36         bool wait_for_resp;
  37         u32 resp_len;
  38 };
  39
  40 /*
  41  * PCI-specific Target state
  42  *
  43  * NOTE: Structure is shared between Host software and Target firmware!
  44  *
  45  * Much of this may be of interest to the Host so
  46  * HOST_INTEREST->hi_interconnect_state points here
  47  * (and all members are 32-bit quantities in order to
  48  * facilitate Host access). In particular, Host software is
  49  * required to initialize pipe_cfg_addr and svc_to_pipe_map.
  50  */
  51 struct pcie_state {
  52         /* Pipe configuration Target address */
  53         /* NB: ce_pipe_config[CE_COUNT] */
  54         u32 pipe_cfg_addr;
  55
  56         /* Service to pipe map Target address */
  57         /* NB: service_to_pipe[PIPE_TO_CE_MAP_CN] */
  58         u32 svc_to_pipe_map;
  59
  60         /* number of MSI interrupts requested */
  61         u32 msi_requested;
  62
  63         /* number of MSI interrupts granted */
  64         u32 msi_granted;
  65
  66         /* Message Signalled Interrupt address */
  67         u32 msi_addr;
  68
  69         /* Base data */
  70         u32 msi_data;
  71
  72         /*
  73          * Data for firmware interrupt;
  74          * MSI data for other interrupts are
  75          * in various SoC registers
  76          */
  77         u32 msi_fw_intr_data;
  78
  79         /* PCIE_PWR_METHOD_* */
  80         u32 power_mgmt_method;
  81
  82         /* PCIE_CONFIG_FLAG_* */
  83         u32 config_flags;
  84 };
  85
  86 /* PCIE_CONFIG_FLAG definitions */
  87 #define PCIE_CONFIG_FLAG_ENABLE_L1  0x0000001
  88
  89 /* Host software's Copy Engine configuration. */
  90 #define CE_ATTR_FLAGS 0
  91
  92 /*
  93  * Configuration information for a Copy Engine pipe.
  94  * Passed from Host to Target during startup (one per CE).
  95  *
  96  * NOTE: Structure is shared between Host software and Target firmware!
  97  */
  98 struct ce_pipe_config {
  99         __le32 pipenum;
 100         __le32 pipedir;
 101         __le32 nentries;
 102         __le32 nbytes_max;
 103         __le32 flags;
 104         __le32 reserved;
 105 };
 106
 107 /*
 108  * Directions for interconnect pipe configuration.
 109  * These definitions may be used during configuration and are shared
 110  * between Host and Target.
 111  *
 112  * Pipe Directions are relative to the Host, so PIPEDIR_IN means
 113  * "coming IN over air through Target to Host" as with a WiFi Rx operation.
 114  * Conversely, PIPEDIR_OUT means "going OUT from Host through Target over air"
 115  * as with a WiFi Tx operation. This is somewhat awkward for the "middle-man"
 116  * Target since things that are "PIPEDIR_OUT" are coming IN to the Target
 117  * over the interconnect.
 118  */
 119 #define PIPEDIR_NONE    0
 120 #define PIPEDIR_IN      1  /* Target-->Host, WiFi Rx direction */
 121 #define PIPEDIR_OUT     2  /* Host->Target, WiFi Tx direction */
 122 #define PIPEDIR_INOUT   3  /* bidirectional */
 123
 124 /* Establish a mapping between a service/direction and a pipe. */
 125 struct service_to_pipe {
 126         __le32 service_id;
 127         __le32 pipedir;
 128         __le32 pipenum;
 129 };
 130
 131 /* Per-pipe state. */
 132 struct ath10k_pci_pipe {
 133         /* Handle of underlying Copy Engine */
 134         struct ath10k_ce_pipe *ce_hdl;
 135
 136         /* Our pipe number; facilitiates use of pipe_info ptrs. */
 137         u8 pipe_num;
 138
 139         /* Convenience back pointer to hif_ce_state. */
 140         struct ath10k *hif_ce_state;
 141
 142         size_t buf_sz;
 143
 144         /* protects compl_free and num_send_allowed */
 145         spinlock_t pipe_lock;
 146 };
 147
 148 struct ath10k_pci_supp_chip {
 149         u32 dev_id;
 150         u32 rev_id;
 151 };
 152
 153 enum ath10k_pci_irq_mode {
 154         ATH10K_PCI_IRQ_AUTO = 0,
 155         ATH10K_PCI_IRQ_LEGACY = 1,
 156         ATH10K_PCI_IRQ_MSI = 2,
 157 };
 158
 159 struct ath10k_pci {
 160         struct pci_dev *pdev;
 161         struct device *dev;
 162         struct ath10k *ar;
 163         void __iomem *mem;
 164         size_t mem_len;
 165
 166         /* Operating interrupt mode */
 167         enum ath10k_pci_irq_mode oper_irq_mode;
 168
 169         struct ath10k_pci_pipe pipe_info[CE_COUNT_MAX];
 170
 171         /* Copy Engine used for Diagnostic Accesses */
 172         struct ath10k_ce_pipe *ce_diag;
 173
 174         struct ath10k_ce ce;
 175         struct timer_list rx_post_retry;
 176
 177         /* Due to HW quirks it is recommended to disable ASPM during device
 178          * bootup. To do that the original PCI-E Link Control is stored before
 179          * device bootup is executed and re-programmed later.
 180          */
 181         u16 link_ctl;
 182
 183         /* Protects ps_awake and ps_wake_refcount */
 184         spinlock_t ps_lock;
 185
 186         /* The device has a special powersave-oriented register. When device is
 187          * considered asleep it drains less power and driver is forbidden from
 188          * accessing most MMIO registers. If host were to access them without
 189          * waking up the device might scribble over host memory or return
 190          * 0xdeadbeef readouts.
 191          */
 192         unsigned long ps_wake_refcount;
 193
 194         /* Waking up takes some time (up to 2ms in some cases) so it can be bad
 195          * for latency. To mitigate this the device isn't immediately allowed
 196          * to sleep after all references are undone - instead there's a grace
 197          * period after which the powersave register is updated unless some
 198          * activity to/from device happened in the meantime.
 199          *
 200          * Also see comments on ATH10K_PCI_SLEEP_GRACE_PERIOD_MSEC.
 201          */
 202         struct timer_list ps_timer;
 203
 204         /* MMIO registers are used to communicate with the device. With
 205          * intensive traffic accessing powersave register would be a bit
 206          * wasteful overhead and would needlessly stall CPU. It is far more
 207          * efficient to rely on a variable in RAM and update it only upon
 208          * powersave register state changes.
 209          */
 210         bool ps_awake;
 211
 212         /* pci power save, disable for QCA988X and QCA99X0.
 213          * Writing 'false' to this variable avoids frequent locking
 214          * on MMIO read/write.
 215          */
 216         bool pci_ps;
 217
 218         /* Chip specific pci reset routine used to do a safe reset */
 219         int (*pci_soft_reset)(struct ath10k *ar);
 220
 221         /* Chip specific pci full reset function */
 222         int (*pci_hard_reset)(struct ath10k *ar);
 223
 224         /* chip specific methods for converting target CPU virtual address
 225          * space to CE address space
 226          */
 227         u32 (*targ_cpu_to_ce_addr)(struct ath10k *ar, u32 addr);
 228
 229         /* Keep this entry in the last, memory for struct ath10k_ahb is
 230          * allocated (ahb support enabled case) in the continuation of
 231          * this struct.
 232          */
 233         struct ath10k_ahb ahb[0];
 234 };
 235
 236 static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar)
 237 {
 238         return (struct ath10k_pci *)ar->drv_priv;
 239 }
 240
 241 #define ATH10K_PCI_RX_POST_RETRY_MS 50
 242 #define ATH_PCI_RESET_WAIT_MAX 10 /* ms */
 243 #define PCIE_WAKE_TIMEOUT 30000 /* 30ms */
 244 #define PCIE_WAKE_LATE_US 10000 /* 10ms */
 245
 246 #define BAR_NUM 0
 247
 248 #define CDC_WAR_MAGIC_STR   0xceef0000
 249 #define CDC_WAR_DATA_CE     4
 250
 251 /* Wait up to this many Ms for a Diagnostic Access CE operation to complete */
 252 #define DIAG_ACCESS_CE_TIMEOUT_MS 10
 253
 254 void ath10k_pci_write32(struct ath10k *ar, u32 offset, u32 value);
 255 void ath10k_pci_soc_write32(struct ath10k *ar, u32 addr, u32 val);
 256 void ath10k_pci_reg_write32(struct ath10k *ar, u32 addr, u32 val);
 257
 258 u32 ath10k_pci_read32(struct ath10k *ar, u32 offset);
 259 u32 ath10k_pci_soc_read32(struct ath10k *ar, u32 addr);
 260 u32 ath10k_pci_reg_read32(struct ath10k *ar, u32 addr);
 261
 262 int ath10k_pci_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
 263                          struct ath10k_hif_sg_item *items, int n_items);
 264 int ath10k_pci_hif_diag_read(struct ath10k *ar, u32 address, void *buf,
 265                              size_t buf_len);
 266 int ath10k_pci_diag_write_mem(struct ath10k *ar, u32 address,
 267                               const void *data, int nbytes);
 268 int ath10k_pci_hif_exchange_bmi_msg(struct ath10k *ar, void *req, u32 req_len,
 269                                     void *resp, u32 *resp_len);
 270 int ath10k_pci_hif_map_service_to_pipe(struct ath10k *ar, u16 service_id,
 271                                        u8 *ul_pipe, u8 *dl_pipe);
 272 void ath10k_pci_hif_get_default_pipe(struct ath10k *ar, u8 *ul_pipe,
 273                                      u8 *dl_pipe);
 274 void ath10k_pci_hif_send_complete_check(struct ath10k *ar, u8 pipe,
 275                                         int force);
 276 u16 ath10k_pci_hif_get_free_queue_number(struct ath10k *ar, u8 pipe);
 277 void ath10k_pci_hif_power_down(struct ath10k *ar);
 278 int ath10k_pci_alloc_pipes(struct ath10k *ar);
 279 void ath10k_pci_free_pipes(struct ath10k *ar);
 280 void ath10k_pci_free_pipes(struct ath10k *ar);
 281 void ath10k_pci_rx_replenish_retry(unsigned long ptr);
 282 void ath10k_pci_ce_deinit(struct ath10k *ar);
 283 void ath10k_pci_init_napi(struct ath10k *ar);
 284 int ath10k_pci_init_pipes(struct ath10k *ar);
 285 int ath10k_pci_init_config(struct ath10k *ar);
 286 void ath10k_pci_rx_post(struct ath10k *ar);
 287 void ath10k_pci_flush(struct ath10k *ar);
 288 void ath10k_pci_enable_legacy_irq(struct ath10k *ar);
 289 bool ath10k_pci_irq_pending(struct ath10k *ar);
 290 void ath10k_pci_disable_and_clear_legacy_irq(struct ath10k *ar);
 291 void ath10k_pci_irq_msi_fw_mask(struct ath10k *ar);
 292 int ath10k_pci_wait_for_target_init(struct ath10k *ar);
 293 int ath10k_pci_setup_resource(struct ath10k *ar);
 294 void ath10k_pci_release_resource(struct ath10k *ar);
 295
 296 /* QCA6174 is known to have Tx/Rx issues when SOC_WAKE register is poked too
 297  * frequently. To avoid this put SoC to sleep after a very conservative grace
 298  * period. Adjust with great care.
 299  */
 300 #define ATH10K_PCI_SLEEP_GRACE_PERIOD_MSEC 60
 301
 302 #endif /* _PCI_H_ */