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6#include <linux/bitfield.h>
7#include <linux/interrupt.h>
8#include <linux/irq.h>
9#include <linux/irqdomain.h>
10#include <linux/mailbox_controller.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13
14#include <dt-bindings/mailbox/qcom-ipcc.h>
15
16#define IPCC_MBOX_MAX_CHAN 48
17
18
19#define IPCC_REG_SEND_ID 0x0c
20#define IPCC_REG_RECV_ID 0x10
21#define IPCC_REG_RECV_SIGNAL_ENABLE 0x14
22#define IPCC_REG_RECV_SIGNAL_DISABLE 0x18
23#define IPCC_REG_RECV_SIGNAL_CLEAR 0x1c
24#define IPCC_REG_CLIENT_CLEAR 0x38
25
26#define IPCC_SIGNAL_ID_MASK GENMASK(15, 0)
27#define IPCC_CLIENT_ID_MASK GENMASK(31, 16)
28
29#define IPCC_NO_PENDING_IRQ GENMASK(31, 0)
30
31
32
33
34
35
36struct qcom_ipcc_chan_info {
37 u16 client_id;
38 u16 signal_id;
39};
40
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43
44
45
46
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48
49
50
51struct qcom_ipcc {
52 struct device *dev;
53 void __iomem *base;
54 struct irq_domain *irq_domain;
55 struct mbox_chan chan[IPCC_MBOX_MAX_CHAN];
56 struct qcom_ipcc_chan_info mchan[IPCC_MBOX_MAX_CHAN];
57 struct mbox_controller mbox;
58 int irq;
59};
60
61static inline struct qcom_ipcc *to_qcom_ipcc(struct mbox_controller *mbox)
62{
63 return container_of(mbox, struct qcom_ipcc, mbox);
64}
65
66static inline u32 qcom_ipcc_get_hwirq(u16 client_id, u16 signal_id)
67{
68 return FIELD_PREP(IPCC_CLIENT_ID_MASK, client_id) |
69 FIELD_PREP(IPCC_SIGNAL_ID_MASK, signal_id);
70}
71
72static irqreturn_t qcom_ipcc_irq_fn(int irq, void *data)
73{
74 struct qcom_ipcc *ipcc = data;
75 u32 hwirq;
76 int virq;
77
78 for (;;) {
79 hwirq = readl(ipcc->base + IPCC_REG_RECV_ID);
80 if (hwirq == IPCC_NO_PENDING_IRQ)
81 break;
82
83 virq = irq_find_mapping(ipcc->irq_domain, hwirq);
84 writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_CLEAR);
85 generic_handle_irq(virq);
86 }
87
88 return IRQ_HANDLED;
89}
90
91static void qcom_ipcc_mask_irq(struct irq_data *irqd)
92{
93 struct qcom_ipcc *ipcc = irq_data_get_irq_chip_data(irqd);
94 irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
95
96 writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_DISABLE);
97}
98
99static void qcom_ipcc_unmask_irq(struct irq_data *irqd)
100{
101 struct qcom_ipcc *ipcc = irq_data_get_irq_chip_data(irqd);
102 irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
103
104 writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_ENABLE);
105}
106
107static struct irq_chip qcom_ipcc_irq_chip = {
108 .name = "ipcc",
109 .irq_mask = qcom_ipcc_mask_irq,
110 .irq_unmask = qcom_ipcc_unmask_irq,
111 .flags = IRQCHIP_SKIP_SET_WAKE,
112};
113
114static int qcom_ipcc_domain_map(struct irq_domain *d, unsigned int irq,
115 irq_hw_number_t hw)
116{
117 struct qcom_ipcc *ipcc = d->host_data;
118
119 irq_set_chip_and_handler(irq, &qcom_ipcc_irq_chip, handle_level_irq);
120 irq_set_chip_data(irq, ipcc);
121 irq_set_noprobe(irq);
122
123 return 0;
124}
125
126static int qcom_ipcc_domain_xlate(struct irq_domain *d,
127 struct device_node *node, const u32 *intspec,
128 unsigned int intsize,
129 unsigned long *out_hwirq,
130 unsigned int *out_type)
131{
132 if (intsize != 3)
133 return -EINVAL;
134
135 *out_hwirq = qcom_ipcc_get_hwirq(intspec[0], intspec[1]);
136 *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
137
138 return 0;
139}
140
141static const struct irq_domain_ops qcom_ipcc_irq_ops = {
142 .map = qcom_ipcc_domain_map,
143 .xlate = qcom_ipcc_domain_xlate,
144};
145
146static int qcom_ipcc_mbox_send_data(struct mbox_chan *chan, void *data)
147{
148 struct qcom_ipcc *ipcc = to_qcom_ipcc(chan->mbox);
149 struct qcom_ipcc_chan_info *mchan = chan->con_priv;
150 u32 hwirq;
151
152 hwirq = qcom_ipcc_get_hwirq(mchan->client_id, mchan->signal_id);
153 writel(hwirq, ipcc->base + IPCC_REG_SEND_ID);
154
155 return 0;
156}
157
158static struct mbox_chan *qcom_ipcc_mbox_xlate(struct mbox_controller *mbox,
159 const struct of_phandle_args *ph)
160{
161 struct qcom_ipcc *ipcc = to_qcom_ipcc(mbox);
162 struct qcom_ipcc_chan_info *mchan;
163 struct mbox_chan *chan;
164 unsigned int i;
165
166 if (ph->args_count != 2)
167 return ERR_PTR(-EINVAL);
168
169 for (i = 0; i < IPCC_MBOX_MAX_CHAN; i++) {
170 chan = &ipcc->chan[i];
171 if (!chan->con_priv) {
172 mchan = &ipcc->mchan[i];
173 mchan->client_id = ph->args[0];
174 mchan->signal_id = ph->args[1];
175 chan->con_priv = mchan;
176 break;
177 }
178
179 chan = NULL;
180 }
181
182 return chan ?: ERR_PTR(-EBUSY);
183}
184
185static const struct mbox_chan_ops ipcc_mbox_chan_ops = {
186 .send_data = qcom_ipcc_mbox_send_data,
187};
188
189static int qcom_ipcc_setup_mbox(struct qcom_ipcc *ipcc)
190{
191 struct mbox_controller *mbox;
192 struct device *dev = ipcc->dev;
193
194 mbox = &ipcc->mbox;
195 mbox->dev = dev;
196 mbox->num_chans = IPCC_MBOX_MAX_CHAN;
197 mbox->chans = ipcc->chan;
198 mbox->ops = &ipcc_mbox_chan_ops;
199 mbox->of_xlate = qcom_ipcc_mbox_xlate;
200 mbox->txdone_irq = false;
201 mbox->txdone_poll = false;
202
203 return devm_mbox_controller_register(dev, mbox);
204}
205
206static int qcom_ipcc_probe(struct platform_device *pdev)
207{
208 struct qcom_ipcc *ipcc;
209 int ret;
210
211 ipcc = devm_kzalloc(&pdev->dev, sizeof(*ipcc), GFP_KERNEL);
212 if (!ipcc)
213 return -ENOMEM;
214
215 ipcc->dev = &pdev->dev;
216
217 ipcc->base = devm_platform_ioremap_resource(pdev, 0);
218 if (IS_ERR(ipcc->base))
219 return PTR_ERR(ipcc->base);
220
221 ipcc->irq = platform_get_irq(pdev, 0);
222 if (ipcc->irq < 0)
223 return ipcc->irq;
224
225 ipcc->irq_domain = irq_domain_add_tree(pdev->dev.of_node,
226 &qcom_ipcc_irq_ops, ipcc);
227 if (!ipcc->irq_domain)
228 return -ENOMEM;
229
230 ret = qcom_ipcc_setup_mbox(ipcc);
231 if (ret)
232 goto err_mbox;
233
234 ret = devm_request_irq(&pdev->dev, ipcc->irq, qcom_ipcc_irq_fn,
235 IRQF_TRIGGER_HIGH, "ipcc", ipcc);
236 if (ret < 0) {
237 dev_err(&pdev->dev, "Failed to register the irq: %d\n", ret);
238 goto err_mbox;
239 }
240
241 enable_irq_wake(ipcc->irq);
242 platform_set_drvdata(pdev, ipcc);
243
244 return 0;
245
246err_mbox:
247 irq_domain_remove(ipcc->irq_domain);
248
249 return ret;
250}
251
252static int qcom_ipcc_remove(struct platform_device *pdev)
253{
254 struct qcom_ipcc *ipcc = platform_get_drvdata(pdev);
255
256 disable_irq_wake(ipcc->irq);
257 irq_domain_remove(ipcc->irq_domain);
258
259 return 0;
260}
261
262static const struct of_device_id qcom_ipcc_of_match[] = {
263 { .compatible = "qcom,ipcc"},
264 {}
265};
266MODULE_DEVICE_TABLE(of, qcom_ipcc_of_match);
267
268static struct platform_driver qcom_ipcc_driver = {
269 .probe = qcom_ipcc_probe,
270 .remove = qcom_ipcc_remove,
271 .driver = {
272 .name = "qcom-ipcc",
273 .of_match_table = qcom_ipcc_of_match,
274 },
275};
276
277static int __init qcom_ipcc_init(void)
278{
279 return platform_driver_register(&qcom_ipcc_driver);
280}
281arch_initcall(qcom_ipcc_init);
282
283MODULE_AUTHOR("Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>");
284MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
285MODULE_DESCRIPTION("Qualcomm Technologies, Inc. IPCC driver");
286MODULE_LICENSE("GPL v2");
287
