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3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
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6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2017 Intel Deutschland GmbH
9  * Copyright(c) 2018 - 2019 Intel Corporation
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of version 2 of the GNU General Public License as
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15  * This program is distributed in the hope that it will be useful, but
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18  * General Public License for more details.
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22  * Copyright(c) 2017 Intel Deutschland GmbH
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52  *****************************************************************************/
53 #include "iwl-trans.h"
54 #include "iwl-prph.h"
55 #include "iwl-context-info.h"
56 #include "iwl-context-info-gen3.h"
57 #include "internal.h"
58 #include "fw/dbg.h"
59 
60 /*
61  * Start up NIC's basic functionality after it has been reset
62  * (e.g. after platform boot, or shutdown via iwl_pcie_apm_stop())
63  * NOTE:  This does not load uCode nor start the embedded processor
64  */
65 int iwl_pcie_gen2_apm_init(struct iwl_trans *trans)
66 {
67 	int ret = 0;
68 
69 	IWL_DEBUG_INFO(trans, "Init card's basic functions\n");
70 
71 	/*
72 	 * Use "set_bit" below rather than "write", to preserve any hardware
73 	 * bits already set by default after reset.
74 	 */
75 
76 	/*
77 	 * Disable L0s without affecting L1;
78 	 * don't wait for ICH L0s (ICH bug W/A)
79 	 */
80 	iwl_set_bit(trans, CSR_GIO_CHICKEN_BITS,
81 		    CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
82 
83 	/* Set FH wait threshold to maximum (HW error during stress W/A) */
84 	iwl_set_bit(trans, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
85 
86 	/*
87 	 * Enable HAP INTA (interrupt from management bus) to
88 	 * wake device's PCI Express link L1a -> L0s
89 	 */
90 	iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
91 		    CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
92 
93 	iwl_pcie_apm_config(trans);
94 
95 	ret = iwl_finish_nic_init(trans, trans->trans_cfg);
96 	if (ret)
97 		return ret;
98 
99 	set_bit(STATUS_DEVICE_ENABLED, &trans->status);
100 
101 	return 0;
102 }
103 
104 static void iwl_pcie_gen2_apm_stop(struct iwl_trans *trans, bool op_mode_leave)
105 {
106 	IWL_DEBUG_INFO(trans, "Stop card, put in low power state\n");
107 
108 	if (op_mode_leave) {
109 		if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status))
110 			iwl_pcie_gen2_apm_init(trans);
111 
112 		/* inform ME that we are leaving */
113 		iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
114 			    CSR_RESET_LINK_PWR_MGMT_DISABLED);
115 		iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
116 			    CSR_HW_IF_CONFIG_REG_PREPARE |
117 			    CSR_HW_IF_CONFIG_REG_ENABLE_PME);
118 		mdelay(1);
119 		iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
120 			      CSR_RESET_LINK_PWR_MGMT_DISABLED);
121 		mdelay(5);
122 	}
123 
124 	clear_bit(STATUS_DEVICE_ENABLED, &trans->status);
125 
126 	/* Stop device's DMA activity */
127 	iwl_pcie_apm_stop_master(trans);
128 
129 	iwl_trans_sw_reset(trans);
130 
131 	/*
132 	 * Clear "initialization complete" bit to move adapter from
133 	 * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
134 	 */
135 	iwl_clear_bit(trans, CSR_GP_CNTRL,
136 		      BIT(trans->trans_cfg->csr->flag_init_done));
137 }
138 
139 void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
140 {
141 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
142 
143 	lockdep_assert_held(&trans_pcie->mutex);
144 
145 	if (trans_pcie->is_down)
146 		return;
147 
148 	trans_pcie->is_down = true;
149 
150 	/* tell the device to stop sending interrupts */
151 	iwl_disable_interrupts(trans);
152 
153 	/* device going down, Stop using ICT table */
154 	iwl_pcie_disable_ict(trans);
155 
156 	/*
157 	 * If a HW restart happens during firmware loading,
158 	 * then the firmware loading might call this function
159 	 * and later it might be called again due to the
160 	 * restart. So don't process again if the device is
161 	 * already dead.
162 	 */
163 	if (test_and_clear_bit(STATUS_DEVICE_ENABLED, &trans->status)) {
164 		IWL_DEBUG_INFO(trans,
165 			       "DEVICE_ENABLED bit was set and is now cleared\n");
166 		iwl_pcie_gen2_tx_stop(trans);
167 		iwl_pcie_rx_stop(trans);
168 	}
169 
170 	iwl_pcie_ctxt_info_free_paging(trans);
171 	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_22560)
172 		iwl_pcie_ctxt_info_gen3_free(trans);
173 	else
174 		iwl_pcie_ctxt_info_free(trans);
175 
176 	/* Make sure (redundant) we've released our request to stay awake */
177 	iwl_clear_bit(trans, CSR_GP_CNTRL,
178 		      BIT(trans->trans_cfg->csr->flag_mac_access_req));
179 
180 	/* Stop the device, and put it in low power state */
181 	iwl_pcie_gen2_apm_stop(trans, false);
182 
183 	iwl_trans_sw_reset(trans);
184 
185 	/*
186 	 * Upon stop, the IVAR table gets erased, so msi-x won't
187 	 * work. This causes a bug in RF-KILL flows, since the interrupt
188 	 * that enables radio won't fire on the correct irq, and the
189 	 * driver won't be able to handle the interrupt.
190 	 * Configure the IVAR table again after reset.
191 	 */
192 	iwl_pcie_conf_msix_hw(trans_pcie);
193 
194 	/*
195 	 * Upon stop, the APM issues an interrupt if HW RF kill is set.
196 	 * This is a bug in certain verions of the hardware.
197 	 * Certain devices also keep sending HW RF kill interrupt all
198 	 * the time, unless the interrupt is ACKed even if the interrupt
199 	 * should be masked. Re-ACK all the interrupts here.
200 	 */
201 	iwl_disable_interrupts(trans);
202 
203 	/* clear all status bits */
204 	clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
205 	clear_bit(STATUS_INT_ENABLED, &trans->status);
206 	clear_bit(STATUS_TPOWER_PMI, &trans->status);
207 
208 	/*
209 	 * Even if we stop the HW, we still want the RF kill
210 	 * interrupt
211 	 */
212 	iwl_enable_rfkill_int(trans);
213 
214 	/* re-take ownership to prevent other users from stealing the device */
215 	iwl_pcie_prepare_card_hw(trans);
216 }
217 
218 void iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
219 {
220 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
221 	bool was_in_rfkill;
222 
223 	mutex_lock(&trans_pcie->mutex);
224 	trans_pcie->opmode_down = true;
225 	was_in_rfkill = test_bit(STATUS_RFKILL_OPMODE, &trans->status);
226 	_iwl_trans_pcie_gen2_stop_device(trans);
227 	iwl_trans_pcie_handle_stop_rfkill(trans, was_in_rfkill);
228 	mutex_unlock(&trans_pcie->mutex);
229 }
230 
231 static int iwl_pcie_gen2_nic_init(struct iwl_trans *trans)
232 {
233 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
234 	int queue_size = max_t(u32, IWL_CMD_QUEUE_SIZE,
235 			       trans->cfg->min_txq_size);
236 
237 	/* TODO: most of the logic can be removed in A0 - but not in Z0 */
238 	spin_lock(&trans_pcie->irq_lock);
239 	iwl_pcie_gen2_apm_init(trans);
240 	spin_unlock(&trans_pcie->irq_lock);
241 
242 	iwl_op_mode_nic_config(trans->op_mode);
243 
244 	/* Allocate the RX queue, or reset if it is already allocated */
245 	if (iwl_pcie_gen2_rx_init(trans))
246 		return -ENOMEM;
247 
248 	/* Allocate or reset and init all Tx and Command queues */
249 	if (iwl_pcie_gen2_tx_init(trans, trans_pcie->cmd_queue, queue_size))
250 		return -ENOMEM;
251 
252 	/* enable shadow regs in HW */
253 	iwl_set_bit(trans, CSR_MAC_SHADOW_REG_CTRL, 0x800FFFFF);
254 	IWL_DEBUG_INFO(trans, "Enabling shadow registers in device\n");
255 
256 	return 0;
257 }
258 
259 void iwl_trans_pcie_gen2_fw_alive(struct iwl_trans *trans, u32 scd_addr)
260 {
261 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
262 
263 	iwl_pcie_reset_ict(trans);
264 
265 	/* make sure all queue are not stopped/used */
266 	memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
267 	memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
268 
269 	/* now that we got alive we can free the fw image & the context info.
270 	 * paging memory cannot be freed included since FW will still use it
271 	 */
272 	iwl_pcie_ctxt_info_free(trans);
273 
274 	/*
275 	 * Re-enable all the interrupts, including the RF-Kill one, now that
276 	 * the firmware is alive.
277 	 */
278 	iwl_enable_interrupts(trans);
279 	mutex_lock(&trans_pcie->mutex);
280 	iwl_pcie_check_hw_rf_kill(trans);
281 	mutex_unlock(&trans_pcie->mutex);
282 }
283 
284 int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans,
285 				 const struct fw_img *fw, bool run_in_rfkill)
286 {
287 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
288 	bool hw_rfkill;
289 	int ret;
290 
291 	/* This may fail if AMT took ownership of the device */
292 	if (iwl_pcie_prepare_card_hw(trans)) {
293 		IWL_WARN(trans, "Exit HW not ready\n");
294 		ret = -EIO;
295 		goto out;
296 	}
297 
298 	iwl_enable_rfkill_int(trans);
299 
300 	iwl_write32(trans, CSR_INT, 0xFFFFFFFF);
301 
302 	/*
303 	 * We enabled the RF-Kill interrupt and the handler may very
304 	 * well be running. Disable the interrupts to make sure no other
305 	 * interrupt can be fired.
306 	 */
307 	iwl_disable_interrupts(trans);
308 
309 	/* Make sure it finished running */
310 	iwl_pcie_synchronize_irqs(trans);
311 
312 	mutex_lock(&trans_pcie->mutex);
313 
314 	/* If platform's RF_KILL switch is NOT set to KILL */
315 	hw_rfkill = iwl_pcie_check_hw_rf_kill(trans);
316 	if (hw_rfkill && !run_in_rfkill) {
317 		ret = -ERFKILL;
318 		goto out;
319 	}
320 
321 	/* Someone called stop_device, don't try to start_fw */
322 	if (trans_pcie->is_down) {
323 		IWL_WARN(trans,
324 			 "Can't start_fw since the HW hasn't been started\n");
325 		ret = -EIO;
326 		goto out;
327 	}
328 
329 	/* make sure rfkill handshake bits are cleared */
330 	iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
331 	iwl_write32(trans, CSR_UCODE_DRV_GP1_CLR,
332 		    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
333 
334 	/* clear (again), then enable host interrupts */
335 	iwl_write32(trans, CSR_INT, 0xFFFFFFFF);
336 
337 	ret = iwl_pcie_gen2_nic_init(trans);
338 	if (ret) {
339 		IWL_ERR(trans, "Unable to init nic\n");
340 		goto out;
341 	}
342 
343 	if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_22560)
344 		ret = iwl_pcie_ctxt_info_gen3_init(trans, fw);
345 	else
346 		ret = iwl_pcie_ctxt_info_init(trans, fw);
347 	if (ret)
348 		goto out;
349 
350 	/* re-check RF-Kill state since we may have missed the interrupt */
351 	hw_rfkill = iwl_pcie_check_hw_rf_kill(trans);
352 	if (hw_rfkill && !run_in_rfkill)
353 		ret = -ERFKILL;
354 
355 out:
356 	mutex_unlock(&trans_pcie->mutex);
357 	return ret;
358 }
359