1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Ingenic JZ47xx remoteproc driver
4 * Copyright 2019, Paul Cercueil <paul@crapouillou.net>
5 */
6
7 #include <linux/bitops.h>
8 #include <linux/clk.h>
9 #include <linux/err.h>
10 #include <linux/interrupt.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/remoteproc.h>
15
16 #include "remoteproc_internal.h"
17
18 #define REG_AUX_CTRL 0x0
19 #define REG_AUX_MSG_ACK 0x10
20 #define REG_AUX_MSG 0x14
21 #define REG_CORE_MSG_ACK 0x18
22 #define REG_CORE_MSG 0x1C
23
24 #define AUX_CTRL_SLEEP BIT(31)
25 #define AUX_CTRL_MSG_IRQ_EN BIT(3)
26 #define AUX_CTRL_NMI_RESETS BIT(2)
27 #define AUX_CTRL_NMI BIT(1)
28 #define AUX_CTRL_SW_RESET BIT(0)
29
30 struct vpu_mem_map {
31 const char *name;
32 unsigned int da;
33 };
34
35 struct vpu_mem_info {
36 const struct vpu_mem_map *map;
37 unsigned long len;
38 void __iomem *base;
39 };
40
41 static const struct vpu_mem_map vpu_mem_map[] = {
42 { "tcsm0", 0x132b0000 },
43 { "tcsm1", 0xf4000000 },
44 { "sram", 0x132f0000 },
45 };
46
47 /**
48 * struct vpu - Ingenic VPU remoteproc private structure
49 * @irq: interrupt number
50 * @clks: pointers to the VPU and AUX clocks
51 * @aux_base: raw pointer to the AUX interface registers
52 * @mem_info: array of struct vpu_mem_info, which contain the mapping info of
53 * each of the external memories
54 * @dev: private pointer to the device
55 */
56 struct vpu {
57 int irq;
58 struct clk_bulk_data clks[2];
59 void __iomem *aux_base;
60 struct vpu_mem_info mem_info[ARRAY_SIZE(vpu_mem_map)];
61 struct device *dev;
62 };
63
ingenic_rproc_prepare(struct rproc * rproc)64 static int ingenic_rproc_prepare(struct rproc *rproc)
65 {
66 struct vpu *vpu = rproc->priv;
67 int ret;
68
69 /* The clocks must be enabled for the firmware to be loaded in TCSM */
70 ret = clk_bulk_prepare_enable(ARRAY_SIZE(vpu->clks), vpu->clks);
71 if (ret)
72 dev_err(vpu->dev, "Unable to start clocks: %d\n", ret);
73
74 return ret;
75 }
76
ingenic_rproc_unprepare(struct rproc * rproc)77 static int ingenic_rproc_unprepare(struct rproc *rproc)
78 {
79 struct vpu *vpu = rproc->priv;
80
81 clk_bulk_disable_unprepare(ARRAY_SIZE(vpu->clks), vpu->clks);
82
83 return 0;
84 }
85
ingenic_rproc_start(struct rproc * rproc)86 static int ingenic_rproc_start(struct rproc *rproc)
87 {
88 struct vpu *vpu = rproc->priv;
89 u32 ctrl;
90
91 enable_irq(vpu->irq);
92
93 /* Reset the AUX and enable message IRQ */
94 ctrl = AUX_CTRL_NMI_RESETS | AUX_CTRL_NMI | AUX_CTRL_MSG_IRQ_EN;
95 writel(ctrl, vpu->aux_base + REG_AUX_CTRL);
96
97 return 0;
98 }
99
ingenic_rproc_stop(struct rproc * rproc)100 static int ingenic_rproc_stop(struct rproc *rproc)
101 {
102 struct vpu *vpu = rproc->priv;
103
104 disable_irq(vpu->irq);
105
106 /* Keep AUX in reset mode */
107 writel(AUX_CTRL_SW_RESET, vpu->aux_base + REG_AUX_CTRL);
108
109 return 0;
110 }
111
ingenic_rproc_kick(struct rproc * rproc,int vqid)112 static void ingenic_rproc_kick(struct rproc *rproc, int vqid)
113 {
114 struct vpu *vpu = rproc->priv;
115
116 writel(vqid, vpu->aux_base + REG_CORE_MSG);
117 }
118
ingenic_rproc_da_to_va(struct rproc * rproc,u64 da,size_t len)119 static void *ingenic_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
120 {
121 struct vpu *vpu = rproc->priv;
122 void __iomem *va = NULL;
123 unsigned int i;
124
125 for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
126 const struct vpu_mem_info *info = &vpu->mem_info[i];
127 const struct vpu_mem_map *map = info->map;
128
129 if (da >= map->da && (da + len) < (map->da + info->len)) {
130 va = info->base + (da - map->da);
131 break;
132 }
133 }
134
135 return (__force void *)va;
136 }
137
138 static struct rproc_ops ingenic_rproc_ops = {
139 .prepare = ingenic_rproc_prepare,
140 .unprepare = ingenic_rproc_unprepare,
141 .start = ingenic_rproc_start,
142 .stop = ingenic_rproc_stop,
143 .kick = ingenic_rproc_kick,
144 .da_to_va = ingenic_rproc_da_to_va,
145 };
146
vpu_interrupt(int irq,void * data)147 static irqreturn_t vpu_interrupt(int irq, void *data)
148 {
149 struct rproc *rproc = data;
150 struct vpu *vpu = rproc->priv;
151 u32 vring;
152
153 vring = readl(vpu->aux_base + REG_AUX_MSG);
154
155 /* Ack the interrupt */
156 writel(0, vpu->aux_base + REG_AUX_MSG_ACK);
157
158 return rproc_vq_interrupt(rproc, vring);
159 }
160
ingenic_rproc_probe(struct platform_device * pdev)161 static int ingenic_rproc_probe(struct platform_device *pdev)
162 {
163 struct device *dev = &pdev->dev;
164 struct resource *mem;
165 struct rproc *rproc;
166 struct vpu *vpu;
167 unsigned int i;
168 int ret;
169
170 rproc = devm_rproc_alloc(dev, "ingenic-vpu",
171 &ingenic_rproc_ops, NULL, sizeof(*vpu));
172 if (!rproc)
173 return -ENOMEM;
174
175 vpu = rproc->priv;
176 vpu->dev = &pdev->dev;
177 platform_set_drvdata(pdev, vpu);
178
179 mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "aux");
180 vpu->aux_base = devm_ioremap_resource(dev, mem);
181 if (IS_ERR(vpu->aux_base)) {
182 dev_err(dev, "Failed to ioremap\n");
183 return PTR_ERR(vpu->aux_base);
184 }
185
186 for (i = 0; i < ARRAY_SIZE(vpu_mem_map); i++) {
187 mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
188 vpu_mem_map[i].name);
189
190 vpu->mem_info[i].base = devm_ioremap_resource(dev, mem);
191 if (IS_ERR(vpu->mem_info[i].base)) {
192 ret = PTR_ERR(vpu->mem_info[i].base);
193 dev_err(dev, "Failed to ioremap\n");
194 return ret;
195 }
196
197 vpu->mem_info[i].len = resource_size(mem);
198 vpu->mem_info[i].map = &vpu_mem_map[i];
199 }
200
201 vpu->clks[0].id = "vpu";
202 vpu->clks[1].id = "aux";
203
204 ret = devm_clk_bulk_get(dev, ARRAY_SIZE(vpu->clks), vpu->clks);
205 if (ret) {
206 dev_err(dev, "Failed to get clocks\n");
207 return ret;
208 }
209
210 vpu->irq = platform_get_irq(pdev, 0);
211 if (vpu->irq < 0)
212 return vpu->irq;
213
214 ret = devm_request_irq(dev, vpu->irq, vpu_interrupt, 0, "VPU", rproc);
215 if (ret < 0) {
216 dev_err(dev, "Failed to request IRQ\n");
217 return ret;
218 }
219
220 disable_irq(vpu->irq);
221
222 ret = devm_rproc_add(dev, rproc);
223 if (ret) {
224 dev_err(dev, "Failed to register remote processor\n");
225 return ret;
226 }
227
228 return 0;
229 }
230
231 static const struct of_device_id ingenic_rproc_of_matches[] = {
232 { .compatible = "ingenic,jz4770-vpu-rproc", },
233 {}
234 };
235 MODULE_DEVICE_TABLE(of, ingenic_rproc_of_matches);
236
237 static struct platform_driver ingenic_rproc_driver = {
238 .probe = ingenic_rproc_probe,
239 .driver = {
240 .name = "ingenic-vpu",
241 .of_match_table = ingenic_rproc_of_matches,
242 },
243 };
244 module_platform_driver(ingenic_rproc_driver);
245
246 MODULE_LICENSE("GPL");
247 MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
248 MODULE_DESCRIPTION("Ingenic JZ47xx Remote Processor control driver");
249