1 // SPDX-License-Identifier: GPL-2.0+
2 /* Copyright (c) 2018 Quantenna Communications, Inc. All rights reserved. */
4 #include <linux/printk.h>
6 #include <linux/spinlock.h>
7 #include <linux/mutex.h>
8 #include <linux/netdevice.h>
9 #include <linux/seq_file.h>
10 #include <linux/workqueue.h>
11 #include <linux/completion.h>
13 #include "pcie_priv.h"
20 #define pr_fmt(fmt) "qtnf_pcie: %s: " fmt, __func__
22 #define QTN_SYSCTL_BAR 0
23 #define QTN_SHMEM_BAR 2
26 int qtnf_pcie_control_tx(struct qtnf_bus *bus, struct sk_buff *skb)
28 struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
31 ret = qtnf_shm_ipc_send(&priv->shm_ipc_ep_in, skb->data, skb->len);
33 if (ret == -ETIMEDOUT) {
34 pr_err("EP firmware is dead\n");
35 bus->fw_state = QTNF_FW_STATE_EP_DEAD;
41 int qtnf_pcie_alloc_skb_array(struct qtnf_pcie_bus_priv *priv)
43 struct sk_buff **vaddr;
46 len = priv->tx_bd_num * sizeof(*priv->tx_skb) +
47 priv->rx_bd_num * sizeof(*priv->rx_skb);
48 vaddr = devm_kzalloc(&priv->pdev->dev, len, GFP_KERNEL);
55 vaddr += priv->tx_bd_num;
61 void qtnf_pcie_bringup_fw_async(struct qtnf_bus *bus)
63 struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
64 struct pci_dev *pdev = priv->pdev;
66 get_device(&pdev->dev);
67 schedule_work(&bus->fw_work);
70 static int qtnf_dbg_mps_show(struct seq_file *s, void *data)
72 struct qtnf_bus *bus = dev_get_drvdata(s->private);
73 struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
75 seq_printf(s, "%d\n", priv->mps);
80 static int qtnf_dbg_msi_show(struct seq_file *s, void *data)
82 struct qtnf_bus *bus = dev_get_drvdata(s->private);
83 struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
85 seq_printf(s, "%u\n", priv->msi_enabled);
90 static int qtnf_dbg_shm_stats(struct seq_file *s, void *data)
92 struct qtnf_bus *bus = dev_get_drvdata(s->private);
93 struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
95 seq_printf(s, "shm_ipc_ep_in.tx_packet_count(%zu)\n",
96 priv->shm_ipc_ep_in.tx_packet_count);
97 seq_printf(s, "shm_ipc_ep_in.rx_packet_count(%zu)\n",
98 priv->shm_ipc_ep_in.rx_packet_count);
99 seq_printf(s, "shm_ipc_ep_out.tx_packet_count(%zu)\n",
100 priv->shm_ipc_ep_out.tx_timeout_count);
101 seq_printf(s, "shm_ipc_ep_out.rx_packet_count(%zu)\n",
102 priv->shm_ipc_ep_out.rx_packet_count);
107 void qtnf_pcie_fw_boot_done(struct qtnf_bus *bus, bool boot_success,
108 const char *drv_name)
110 struct qtnf_pcie_bus_priv *priv = get_bus_priv(bus);
111 struct pci_dev *pdev = priv->pdev;
115 bus->fw_state = QTNF_FW_STATE_FW_DNLD_DONE;
117 ret = qtnf_core_attach(bus);
119 pr_err("failed to attach core\n");
120 boot_success = false;
125 qtnf_debugfs_init(bus, drv_name);
126 qtnf_debugfs_add_entry(bus, "mps", qtnf_dbg_mps_show);
127 qtnf_debugfs_add_entry(bus, "msi_enabled", qtnf_dbg_msi_show);
128 qtnf_debugfs_add_entry(bus, "shm_stats", qtnf_dbg_shm_stats);
130 bus->fw_state = QTNF_FW_STATE_DETACHED;
133 put_device(&pdev->dev);
136 static void qtnf_tune_pcie_mps(struct qtnf_pcie_bus_priv *priv)
138 struct pci_dev *pdev = priv->pdev;
139 struct pci_dev *parent;
140 int mps_p, mps_o, mps_m, mps;
144 mps_o = pcie_get_mps(pdev);
146 /* maximum supported mps */
147 mps_m = 128 << pdev->pcie_mpss;
149 /* suggested new mps value */
152 if (pdev->bus && pdev->bus->self) {
153 /* parent (bus) mps */
154 parent = pdev->bus->self;
156 if (pci_is_pcie(parent)) {
157 mps_p = pcie_get_mps(parent);
158 mps = min(mps_m, mps_p);
162 ret = pcie_set_mps(pdev, mps);
164 pr_err("failed to set mps to %d, keep using current %d\n",
170 pr_debug("set mps to %d (was %d, max %d)\n", mps, mps_o, mps_m);
174 static void qtnf_pcie_init_irq(struct qtnf_pcie_bus_priv *priv, bool use_msi)
176 struct pci_dev *pdev = priv->pdev;
178 /* fall back to legacy INTx interrupts by default */
179 priv->msi_enabled = 0;
181 /* check if MSI capability is available */
183 if (!pci_enable_msi(pdev)) {
184 pr_debug("enabled MSI interrupt\n");
185 priv->msi_enabled = 1;
187 pr_warn("failed to enable MSI interrupts");
191 if (!priv->msi_enabled) {
192 pr_warn("legacy PCIE interrupts enabled\n");
197 static void __iomem *qtnf_map_bar(struct qtnf_pcie_bus_priv *priv, u8 index)
204 ret = pcim_iomap_regions(priv->pdev, 1 << index, "qtnfmac_pcie");
206 return IOMEM_ERR_PTR(ret);
208 busaddr = pci_resource_start(priv->pdev, index);
209 len = pci_resource_len(priv->pdev, index);
210 vaddr = pcim_iomap_table(priv->pdev)[index];
212 return IOMEM_ERR_PTR(-ENOMEM);
214 pr_debug("BAR%u vaddr=0x%p busaddr=%pad len=%u\n",
215 index, vaddr, &busaddr, (int)len);
220 static int qtnf_pcie_init_memory(struct qtnf_pcie_bus_priv *priv)
224 priv->sysctl_bar = qtnf_map_bar(priv, QTN_SYSCTL_BAR);
225 if (IS_ERR(priv->sysctl_bar)) {
226 pr_err("failed to map BAR%u\n", QTN_SYSCTL_BAR);
230 priv->dmareg_bar = qtnf_map_bar(priv, QTN_DMA_BAR);
231 if (IS_ERR(priv->dmareg_bar)) {
232 pr_err("failed to map BAR%u\n", QTN_DMA_BAR);
236 priv->epmem_bar = qtnf_map_bar(priv, QTN_SHMEM_BAR);
237 if (IS_ERR(priv->epmem_bar)) {
238 pr_err("failed to map BAR%u\n", QTN_SHMEM_BAR);
245 static void qtnf_pcie_control_rx_callback(void *arg, const u8 __iomem *buf,
248 struct qtnf_pcie_bus_priv *priv = arg;
249 struct qtnf_bus *bus = pci_get_drvdata(priv->pdev);
252 if (unlikely(len == 0)) {
253 pr_warn("zero length packet received\n");
257 skb = __dev_alloc_skb(len, GFP_KERNEL);
259 if (unlikely(!skb)) {
260 pr_err("failed to allocate skb\n");
264 memcpy_fromio(skb_put(skb, len), buf, len);
266 qtnf_trans_handle_rx_ctl_packet(bus, skb);
269 void qtnf_pcie_init_shm_ipc(struct qtnf_pcie_bus_priv *priv,
270 struct qtnf_shm_ipc_region __iomem *ipc_tx_reg,
271 struct qtnf_shm_ipc_region __iomem *ipc_rx_reg,
272 const struct qtnf_shm_ipc_int *ipc_int)
274 const struct qtnf_shm_ipc_rx_callback rx_callback = {
275 qtnf_pcie_control_rx_callback, priv };
277 qtnf_shm_ipc_init(&priv->shm_ipc_ep_in, QTNF_SHM_IPC_OUTBOUND,
278 ipc_tx_reg, priv->workqueue,
279 ipc_int, &rx_callback);
280 qtnf_shm_ipc_init(&priv->shm_ipc_ep_out, QTNF_SHM_IPC_INBOUND,
281 ipc_rx_reg, priv->workqueue,
282 ipc_int, &rx_callback);
285 int qtnf_pcie_probe(struct pci_dev *pdev, size_t priv_size,
286 const struct qtnf_bus_ops *bus_ops, u64 dma_mask,
289 struct qtnf_pcie_bus_priv *pcie_priv;
290 struct qtnf_bus *bus;
293 bus = devm_kzalloc(&pdev->dev,
294 sizeof(*bus) + priv_size, GFP_KERNEL);
298 pcie_priv = get_bus_priv(bus);
300 pci_set_drvdata(pdev, bus);
301 bus->bus_ops = bus_ops;
302 bus->dev = &pdev->dev;
303 bus->fw_state = QTNF_FW_STATE_RESET;
304 pcie_priv->pdev = pdev;
305 pcie_priv->tx_stopped = 0;
307 mutex_init(&bus->bus_lock);
308 spin_lock_init(&pcie_priv->tx_lock);
309 spin_lock_init(&pcie_priv->tx_reclaim_lock);
311 pcie_priv->tx_full_count = 0;
312 pcie_priv->tx_done_count = 0;
313 pcie_priv->pcie_irq_count = 0;
314 pcie_priv->tx_reclaim_done = 0;
315 pcie_priv->tx_reclaim_req = 0;
317 pcie_priv->workqueue = create_singlethread_workqueue("QTNF_PCIE");
318 if (!pcie_priv->workqueue) {
319 pr_err("failed to alloc bus workqueue\n");
324 init_dummy_netdev(&bus->mux_dev);
326 if (!pci_is_pcie(pdev)) {
327 pr_err("device %s is not PCI Express\n", pci_name(pdev));
332 qtnf_tune_pcie_mps(pcie_priv);
334 ret = pcim_enable_device(pdev);
336 pr_err("failed to init PCI device %x\n", pdev->device);
339 pr_debug("successful init of PCI device %x\n", pdev->device);
342 ret = dma_set_mask_and_coherent(&pdev->dev, dma_mask);
344 pr_err("PCIE DMA coherent mask init failed\n");
348 pci_set_master(pdev);
349 qtnf_pcie_init_irq(pcie_priv, use_msi);
351 ret = qtnf_pcie_init_memory(pcie_priv);
353 pr_err("PCIE memory init failed\n");
357 pci_save_state(pdev);
362 flush_workqueue(pcie_priv->workqueue);
363 destroy_workqueue(pcie_priv->workqueue);
365 pci_set_drvdata(pdev, NULL);
370 static void qtnf_pcie_free_shm_ipc(struct qtnf_pcie_bus_priv *priv)
372 qtnf_shm_ipc_free(&priv->shm_ipc_ep_in);
373 qtnf_shm_ipc_free(&priv->shm_ipc_ep_out);
376 void qtnf_pcie_remove(struct qtnf_bus *bus, struct qtnf_pcie_bus_priv *priv)
378 cancel_work_sync(&bus->fw_work);
380 if (bus->fw_state == QTNF_FW_STATE_ACTIVE ||
381 bus->fw_state == QTNF_FW_STATE_EP_DEAD)
382 qtnf_core_detach(bus);
384 netif_napi_del(&bus->mux_napi);
385 flush_workqueue(priv->workqueue);
386 destroy_workqueue(priv->workqueue);
387 tasklet_kill(&priv->reclaim_tq);
389 qtnf_pcie_free_shm_ipc(priv);
390 qtnf_debugfs_remove(bus);
391 pci_set_drvdata(priv->pdev, NULL);