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 26 /* 27 * maximum number of bytes that can be handled atomically by DiagRead/DiagWrite 28 */ 29 #define DIAG_TRANSFER_LIMIT 2048 30 31 /* 32 * maximum number of bytes that can be 33 * handled atomically by DiagRead/DiagWrite 34 */ 35 #define DIAG_TRANSFER_LIMIT 2048 36 37 struct bmi_xfer { 38 bool tx_done; 39 bool rx_done; 40 bool wait_for_resp; 41 u32 resp_len; 42 }; 43 44 /* 45 * PCI-specific Target state 46 * 47 * NOTE: Structure is shared between Host software and Target firmware! 48 * 49 * Much of this may be of interest to the Host so 50 * HOST_INTEREST->hi_interconnect_state points here 51 * (and all members are 32-bit quantities in order to 52 * facilitate Host access). In particular, Host software is 53 * required to initialize pipe_cfg_addr and svc_to_pipe_map. 54 */ 55 struct pcie_state { 56 /* Pipe configuration Target address */ 57 /* NB: ce_pipe_config[CE_COUNT] */ 58 u32 pipe_cfg_addr; 59 60 /* Service to pipe map Target address */ 61 /* NB: service_to_pipe[PIPE_TO_CE_MAP_CN] */ 62 u32 svc_to_pipe_map; 63 64 /* number of MSI interrupts requested */ 65 u32 msi_requested; 66 67 /* number of MSI interrupts granted */ 68 u32 msi_granted; 69 70 /* Message Signalled Interrupt address */ 71 u32 msi_addr; 72 73 /* Base data */ 74 u32 msi_data; 75 76 /* 77 * Data for firmware interrupt; 78 * MSI data for other interrupts are 79 * in various SoC registers 80 */ 81 u32 msi_fw_intr_data; 82 83 /* PCIE_PWR_METHOD_* */ 84 u32 power_mgmt_method; 85 86 /* PCIE_CONFIG_FLAG_* */ 87 u32 config_flags; 88 }; 89 90 /* PCIE_CONFIG_FLAG definitions */ 91 #define PCIE_CONFIG_FLAG_ENABLE_L1 0x0000001 92 93 /* Host software's Copy Engine configuration. */ 94 #define CE_ATTR_FLAGS 0 95 96 /* 97 * Configuration information for a Copy Engine pipe. 98 * Passed from Host to Target during startup (one per CE). 99 * 100 * NOTE: Structure is shared between Host software and Target firmware! 101 */ 102 struct ce_pipe_config { 103 __le32 pipenum; 104 __le32 pipedir; 105 __le32 nentries; 106 __le32 nbytes_max; 107 __le32 flags; 108 __le32 reserved; 109 }; 110 111 /* 112 * Directions for interconnect pipe configuration. 113 * These definitions may be used during configuration and are shared 114 * between Host and Target. 115 * 116 * Pipe Directions are relative to the Host, so PIPEDIR_IN means 117 * "coming IN over air through Target to Host" as with a WiFi Rx operation. 118 * Conversely, PIPEDIR_OUT means "going OUT from Host through Target over air" 119 * as with a WiFi Tx operation. This is somewhat awkward for the "middle-man" 120 * Target since things that are "PIPEDIR_OUT" are coming IN to the Target 121 * over the interconnect. 122 */ 123 #define PIPEDIR_NONE 0 124 #define PIPEDIR_IN 1 /* Target-->Host, WiFi Rx direction */ 125 #define PIPEDIR_OUT 2 /* Host->Target, WiFi Tx direction */ 126 #define PIPEDIR_INOUT 3 /* bidirectional */ 127 128 /* Establish a mapping between a service/direction and a pipe. */ 129 struct service_to_pipe { 130 __le32 service_id; 131 __le32 pipedir; 132 __le32 pipenum; 133 }; 134 135 /* Per-pipe state. */ 136 struct ath10k_pci_pipe { 137 /* Handle of underlying Copy Engine */ 138 struct ath10k_ce_pipe *ce_hdl; 139 140 /* Our pipe number; facilitiates use of pipe_info ptrs. */ 141 u8 pipe_num; 142 143 /* Convenience back pointer to hif_ce_state. */ 144 struct ath10k *hif_ce_state; 145 146 size_t buf_sz; 147 148 /* protects compl_free and num_send_allowed */ 149 spinlock_t pipe_lock; 150 151 struct ath10k_pci *ar_pci; 152 struct tasklet_struct intr; 153 }; 154 155 struct ath10k_pci_supp_chip { 156 u32 dev_id; 157 u32 rev_id; 158 }; 159 160 struct ath10k_pci { 161 struct pci_dev *pdev; 162 struct device *dev; 163 struct ath10k *ar; 164 void __iomem *mem; 165 size_t mem_len; 166 167 /* 168 * Number of MSI interrupts granted, 0 --> using legacy PCI line 169 * interrupts. 170 */ 171 int num_msi_intrs; 172 173 struct tasklet_struct intr_tq; 174 struct tasklet_struct msi_fw_err; 175 176 struct ath10k_pci_pipe pipe_info[CE_COUNT_MAX]; 177 178 /* Copy Engine used for Diagnostic Accesses */ 179 struct ath10k_ce_pipe *ce_diag; 180 181 /* FIXME: document what this really protects */ 182 spinlock_t ce_lock; 183 184 /* Map CE id to ce_state */ 185 struct ath10k_ce_pipe ce_states[CE_COUNT_MAX]; 186 struct timer_list rx_post_retry; 187 188 /* Due to HW quirks it is recommended to disable ASPM during device 189 * bootup. To do that the original PCI-E Link Control is stored before 190 * device bootup is executed and re-programmed later. 191 */ 192 u16 link_ctl; 193 194 /* Protects ps_awake and ps_wake_refcount */ 195 spinlock_t ps_lock; 196 197 /* The device has a special powersave-oriented register. When device is 198 * considered asleep it drains less power and driver is forbidden from 199 * accessing most MMIO registers. If host were to access them without 200 * waking up the device might scribble over host memory or return 201 * 0xdeadbeef readouts. 202 */ 203 unsigned long ps_wake_refcount; 204 205 /* Waking up takes some time (up to 2ms in some cases) so it can be bad 206 * for latency. To mitigate this the device isn't immediately allowed 207 * to sleep after all references are undone - instead there's a grace 208 * period after which the powersave register is updated unless some 209 * activity to/from device happened in the meantime. 210 * 211 * Also see comments on ATH10K_PCI_SLEEP_GRACE_PERIOD_MSEC. 212 */ 213 struct timer_list ps_timer; 214 215 /* MMIO registers are used to communicate with the device. With 216 * intensive traffic accessing powersave register would be a bit 217 * wasteful overhead and would needlessly stall CPU. It is far more 218 * efficient to rely on a variable in RAM and update it only upon 219 * powersave register state changes. 220 */ 221 bool ps_awake; 222 223 /* pci power save, disable for QCA988X and QCA99X0. 224 * Writing 'false' to this variable avoids frequent locking 225 * on MMIO read/write. 226 */ 227 bool pci_ps; 228 }; 229 230 static inline struct ath10k_pci *ath10k_pci_priv(struct ath10k *ar) 231 { 232 return (struct ath10k_pci *)ar->drv_priv; 233 } 234 235 #define ATH10K_PCI_RX_POST_RETRY_MS 50 236 #define ATH_PCI_RESET_WAIT_MAX 10 /* ms */ 237 #define PCIE_WAKE_TIMEOUT 30000 /* 30ms */ 238 #define PCIE_WAKE_LATE_US 10000 /* 10ms */ 239 240 #define BAR_NUM 0 241 242 #define CDC_WAR_MAGIC_STR 0xceef0000 243 #define CDC_WAR_DATA_CE 4 244 245 /* Wait up to this many Ms for a Diagnostic Access CE operation to complete */ 246 #define DIAG_ACCESS_CE_TIMEOUT_MS 10 247 248 void ath10k_pci_write32(struct ath10k *ar, u32 offset, u32 value); 249 void ath10k_pci_soc_write32(struct ath10k *ar, u32 addr, u32 val); 250 void ath10k_pci_reg_write32(struct ath10k *ar, u32 addr, u32 val); 251 252 u32 ath10k_pci_read32(struct ath10k *ar, u32 offset); 253 u32 ath10k_pci_soc_read32(struct ath10k *ar, u32 addr); 254 u32 ath10k_pci_reg_read32(struct ath10k *ar, u32 addr); 255 256 /* QCA6174 is known to have Tx/Rx issues when SOC_WAKE register is poked too 257 * frequently. To avoid this put SoC to sleep after a very conservative grace 258 * period. Adjust with great care. 259 */ 260 #define ATH10K_PCI_SLEEP_GRACE_PERIOD_MSEC 60 261 262 #endif /* _PCI_H_ */ 263