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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Remote processor machine-specific module for DA8XX4 *5 * Copyright (C) 2013 Texas Instruments, Inc.6 */7 8#include <linux/bitops.h>9#include <linux/clk.h>10#include <linux/reset.h>11#include <linux/err.h>12#include <linux/interrupt.h>13#include <linux/io.h>14#include <linux/irq.h>15#include <linux/kernel.h>16#include <linux/module.h>17#include <linux/of_reserved_mem.h>18#include <linux/platform_device.h>19#include <linux/remoteproc.h>20 21#include "remoteproc_internal.h"22 23static char *da8xx_fw_name;24module_param(da8xx_fw_name, charp, 0444);25MODULE_PARM_DESC(da8xx_fw_name,26 "Name of DSP firmware file in /lib/firmware (if not specified defaults to 'rproc-dsp-fw')");27 28/*29 * OMAP-L138 Technical References:30 * http://www.ti.com/product/omap-l13831 */32#define SYSCFG_CHIPSIG0 BIT(0)33#define SYSCFG_CHIPSIG1 BIT(1)34#define SYSCFG_CHIPSIG2 BIT(2)35#define SYSCFG_CHIPSIG3 BIT(3)36#define SYSCFG_CHIPSIG4 BIT(4)37 38#define DA8XX_RPROC_LOCAL_ADDRESS_MASK (SZ_16M - 1)39 40/**41 * struct da8xx_rproc_mem - internal memory structure42 * @cpu_addr: MPU virtual address of the memory region43 * @bus_addr: Bus address used to access the memory region44 * @dev_addr: Device address of the memory region from DSP view45 * @size: Size of the memory region46 */47struct da8xx_rproc_mem {48 void __iomem *cpu_addr;49 phys_addr_t bus_addr;50 u32 dev_addr;51 size_t size;52};53 54/**55 * struct da8xx_rproc - da8xx remote processor instance state56 * @rproc: rproc handle57 * @mem: internal memory regions data58 * @num_mems: number of internal memory regions59 * @dsp_clk: placeholder for platform's DSP clk60 * @ack_fxn: chip-specific ack function for ack'ing irq61 * @irq_data: ack_fxn function parameter62 * @chipsig: virt ptr to DSP interrupt registers (CHIPSIG & CHIPSIG_CLR)63 * @bootreg: virt ptr to DSP boot address register (HOST1CFG)64 * @irq: irq # used by this instance65 */66struct da8xx_rproc {67 struct rproc *rproc;68 struct da8xx_rproc_mem *mem;69 int num_mems;70 struct clk *dsp_clk;71 struct reset_control *dsp_reset;72 void (*ack_fxn)(struct irq_data *data);73 struct irq_data *irq_data;74 void __iomem *chipsig;75 void __iomem *bootreg;76 int irq;77};78 79/**80 * handle_event() - inbound virtqueue message workqueue function81 *82 * This function is registered as a kernel thread and is scheduled by the83 * kernel handler.84 */85static irqreturn_t handle_event(int irq, void *p)86{87 struct rproc *rproc = p;88 89 /* Process incoming buffers on all our vrings */90 rproc_vq_interrupt(rproc, 0);91 rproc_vq_interrupt(rproc, 1);92 93 return IRQ_HANDLED;94}95 96/**97 * da8xx_rproc_callback() - inbound virtqueue message handler98 *99 * This handler is invoked directly by the kernel whenever the remote100 * core (DSP) has modified the state of a virtqueue. There is no101 * "payload" message indicating the virtqueue index as is the case with102 * mailbox-based implementations on OMAP4. As such, this handler "polls"103 * each known virtqueue index for every invocation.104 */105static irqreturn_t da8xx_rproc_callback(int irq, void *p)106{107 struct rproc *rproc = p;108 struct da8xx_rproc *drproc = rproc->priv;109 u32 chipsig;110 111 chipsig = readl(drproc->chipsig);112 if (chipsig & SYSCFG_CHIPSIG0) {113 /* Clear interrupt level source */114 writel(SYSCFG_CHIPSIG0, drproc->chipsig + 4);115 116 /*117 * ACK intr to AINTC.118 *119 * It has already been ack'ed by the kernel before calling120 * this function, but since the ARM<->DSP interrupts in the121 * CHIPSIG register are "level" instead of "pulse" variety,122 * we need to ack it after taking down the level else we'll123 * be called again immediately after returning.124 */125 drproc->ack_fxn(drproc->irq_data);126 127 return IRQ_WAKE_THREAD;128 }129 130 return IRQ_HANDLED;131}132 133static int da8xx_rproc_start(struct rproc *rproc)134{135 struct device *dev = rproc->dev.parent;136 struct da8xx_rproc *drproc = rproc->priv;137 struct clk *dsp_clk = drproc->dsp_clk;138 struct reset_control *dsp_reset = drproc->dsp_reset;139 int ret;140 141 /* hw requires the start (boot) address be on 1KB boundary */142 if (rproc->bootaddr & 0x3ff) {143 dev_err(dev, "invalid boot address: must be aligned to 1KB\n");144 145 return -EINVAL;146 }147 148 writel(rproc->bootaddr, drproc->bootreg);149 150 ret = clk_prepare_enable(dsp_clk);151 if (ret) {152 dev_err(dev, "clk_prepare_enable() failed: %d\n", ret);153 return ret;154 }155 156 ret = reset_control_deassert(dsp_reset);157 if (ret) {158 dev_err(dev, "reset_control_deassert() failed: %d\n", ret);159 clk_disable_unprepare(dsp_clk);160 return ret;161 }162 163 return 0;164}165 166static int da8xx_rproc_stop(struct rproc *rproc)167{168 struct da8xx_rproc *drproc = rproc->priv;169 struct device *dev = rproc->dev.parent;170 int ret;171 172 ret = reset_control_assert(drproc->dsp_reset);173 if (ret) {174 dev_err(dev, "reset_control_assert() failed: %d\n", ret);175 return ret;176 }177 178 clk_disable_unprepare(drproc->dsp_clk);179 180 return 0;181}182 183/* kick a virtqueue */184static void da8xx_rproc_kick(struct rproc *rproc, int vqid)185{186 struct da8xx_rproc *drproc = rproc->priv;187 188 /* Interrupt remote proc */189 writel(SYSCFG_CHIPSIG2, drproc->chipsig);190}191 192static const struct rproc_ops da8xx_rproc_ops = {193 .start = da8xx_rproc_start,194 .stop = da8xx_rproc_stop,195 .kick = da8xx_rproc_kick,196};197 198static int da8xx_rproc_get_internal_memories(struct platform_device *pdev,199 struct da8xx_rproc *drproc)200{201 static const char * const mem_names[] = {"l2sram", "l1pram", "l1dram"};202 int num_mems = ARRAY_SIZE(mem_names);203 struct device *dev = &pdev->dev;204 struct resource *res;205 int i;206 207 drproc->mem = devm_kcalloc(dev, num_mems, sizeof(*drproc->mem),208 GFP_KERNEL);209 if (!drproc->mem)210 return -ENOMEM;211 212 for (i = 0; i < num_mems; i++) {213 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,214 mem_names[i]);215 drproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);216 if (IS_ERR(drproc->mem[i].cpu_addr)) {217 dev_err(dev, "failed to parse and map %s memory\n",218 mem_names[i]);219 return PTR_ERR(drproc->mem[i].cpu_addr);220 }221 drproc->mem[i].bus_addr = res->start;222 drproc->mem[i].dev_addr =223 res->start & DA8XX_RPROC_LOCAL_ADDRESS_MASK;224 drproc->mem[i].size = resource_size(res);225 226 dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %p da 0x%x\n",227 mem_names[i], &drproc->mem[i].bus_addr,228 drproc->mem[i].size, drproc->mem[i].cpu_addr,229 drproc->mem[i].dev_addr);230 }231 drproc->num_mems = num_mems;232 233 return 0;234}235 236static int da8xx_rproc_probe(struct platform_device *pdev)237{238 struct device *dev = &pdev->dev;239 struct da8xx_rproc *drproc;240 struct rproc *rproc;241 struct irq_data *irq_data;242 struct clk *dsp_clk;243 struct reset_control *dsp_reset;244 void __iomem *chipsig;245 void __iomem *bootreg;246 int irq;247 int ret;248 249 irq = platform_get_irq(pdev, 0);250 if (irq < 0)251 return irq;252 253 irq_data = irq_get_irq_data(irq);254 if (!irq_data) {255 dev_err(dev, "irq_get_irq_data(%d): NULL\n", irq);256 return -EINVAL;257 }258 259 bootreg = devm_platform_ioremap_resource_byname(pdev, "host1cfg");260 if (IS_ERR(bootreg))261 return PTR_ERR(bootreg);262 263 chipsig = devm_platform_ioremap_resource_byname(pdev, "chipsig");264 if (IS_ERR(chipsig))265 return PTR_ERR(chipsig);266 267 dsp_clk = devm_clk_get(dev, NULL);268 if (IS_ERR(dsp_clk)) {269 dev_err(dev, "clk_get error: %ld\n", PTR_ERR(dsp_clk));270 271 return PTR_ERR(dsp_clk);272 }273 274 dsp_reset = devm_reset_control_get_exclusive(dev, NULL);275 if (IS_ERR(dsp_reset)) {276 if (PTR_ERR(dsp_reset) != -EPROBE_DEFER)277 dev_err(dev, "unable to get reset control: %ld\n",278 PTR_ERR(dsp_reset));279 280 return PTR_ERR(dsp_reset);281 }282 283 if (dev->of_node) {284 ret = of_reserved_mem_device_init(dev);285 if (ret) {286 dev_err(dev, "device does not have specific CMA pool: %d\n",287 ret);288 return ret;289 }290 }291 292 rproc = rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,293 sizeof(*drproc));294 if (!rproc) {295 ret = -ENOMEM;296 goto free_mem;297 }298 299 /* error recovery is not supported at present */300 rproc->recovery_disabled = true;301 302 drproc = rproc->priv;303 drproc->rproc = rproc;304 drproc->dsp_clk = dsp_clk;305 drproc->dsp_reset = dsp_reset;306 rproc->has_iommu = false;307 308 ret = da8xx_rproc_get_internal_memories(pdev, drproc);309 if (ret)310 goto free_rproc;311 312 platform_set_drvdata(pdev, rproc);313 314 /* everything the ISR needs is now setup, so hook it up */315 ret = devm_request_threaded_irq(dev, irq, da8xx_rproc_callback,316 handle_event, 0, "da8xx-remoteproc",317 rproc);318 if (ret) {319 dev_err(dev, "devm_request_threaded_irq error: %d\n", ret);320 goto free_rproc;321 }322 323 /*324 * rproc_add() can end up enabling the DSP's clk with the DSP325 * *not* in reset, but da8xx_rproc_start() needs the DSP to be326 * held in reset at the time it is called.327 */328 ret = reset_control_assert(dsp_reset);329 if (ret)330 goto free_rproc;331 332 drproc->chipsig = chipsig;333 drproc->bootreg = bootreg;334 drproc->ack_fxn = irq_data->chip->irq_ack;335 drproc->irq_data = irq_data;336 drproc->irq = irq;337 338 ret = rproc_add(rproc);339 if (ret) {340 dev_err(dev, "rproc_add failed: %d\n", ret);341 goto free_rproc;342 }343 344 return 0;345 346free_rproc:347 rproc_free(rproc);348free_mem:349 if (dev->of_node)350 of_reserved_mem_device_release(dev);351 return ret;352}353 354static void da8xx_rproc_remove(struct platform_device *pdev)355{356 struct rproc *rproc = platform_get_drvdata(pdev);357 struct da8xx_rproc *drproc = rproc->priv;358 struct device *dev = &pdev->dev;359 360 /*361 * The devm subsystem might end up releasing things before362 * freeing the irq, thus allowing an interrupt to sneak in while363 * the device is being removed. This should prevent that.364 */365 disable_irq(drproc->irq);366 367 rproc_del(rproc);368 rproc_free(rproc);369 if (dev->of_node)370 of_reserved_mem_device_release(dev);371}372 373static const struct of_device_id davinci_rproc_of_match[] __maybe_unused = {374 { .compatible = "ti,da850-dsp", },375 { /* sentinel */ },376};377MODULE_DEVICE_TABLE(of, davinci_rproc_of_match);378 379static struct platform_driver da8xx_rproc_driver = {380 .probe = da8xx_rproc_probe,381 .remove_new = da8xx_rproc_remove,382 .driver = {383 .name = "davinci-rproc",384 .of_match_table = of_match_ptr(davinci_rproc_of_match),385 },386};387 388module_platform_driver(da8xx_rproc_driver);389 390MODULE_LICENSE("GPL v2");391MODULE_DESCRIPTION("DA8XX Remote Processor control driver");392