drivers/remoteproc/ingenic_rproc.c

   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
  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
  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
  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
 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
 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
 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 const 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
 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
 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");