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Release 4.11 drivers/remoteproc/st_slim_rproc.c

/*
 * SLIM core rproc driver
 *
 * Copyright (C) 2016 STMicroelectronics
 *
 * Author: Peter Griffin <peter.griffin@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/remoteproc.h>
#include <linux/remoteproc/st_slim_rproc.h>
#include "remoteproc_internal.h"

/* SLIM core registers */

#define SLIM_ID_OFST		0x0

#define SLIM_VER_OFST		0x4


#define SLIM_EN_OFST		0x8

#define SLIM_EN_RUN			BIT(0)


#define SLIM_CLK_GATE_OFST	0xC

#define SLIM_CLK_GATE_DIS		BIT(0)

#define SLIM_CLK_GATE_RESET		BIT(2)


#define SLIM_SLIM_PC_OFST	0x20

/* DMEM registers */

#define SLIM_REV_ID_OFST	0x0

#define SLIM_REV_ID_MIN_MASK		GENMASK(15, 8)

#define SLIM_REV_ID_MIN(id)		((id & SLIM_REV_ID_MIN_MASK) >> 8)

#define SLIM_REV_ID_MAJ_MASK		GENMASK(23, 16)

#define SLIM_REV_ID_MAJ(id)		((id & SLIM_REV_ID_MAJ_MASK) >> 16)


/* peripherals registers */

#define SLIM_STBUS_SYNC_OFST	0xF88

#define SLIM_STBUS_SYNC_DIS		BIT(0)


#define SLIM_INT_SET_OFST	0xFD4

#define SLIM_INT_CLR_OFST	0xFD8

#define SLIM_INT_MASK_OFST	0xFDC


#define SLIM_CMD_CLR_OFST	0xFC8

#define SLIM_CMD_MASK_OFST	0xFCC


static const char *mem_names[ST_SLIM_MEM_MAX] = {
	[ST_SLIM_DMEM]	= "dmem",
	[ST_SLIM_IMEM]	= "imem",
};


static int slim_clk_get(struct st_slim_rproc *slim_rproc, struct device *dev) { int clk, err; for (clk = 0; clk < ST_SLIM_MAX_CLK; clk++) { slim_rproc->clks[clk] = of_clk_get(dev->of_node, clk); if (IS_ERR(slim_rproc->clks[clk])) { err = PTR_ERR(slim_rproc->clks[clk]); if (err == -EPROBE_DEFER) goto err_put_clks; slim_rproc->clks[clk] = NULL; break; } } return 0; err_put_clks: while (--clk >= 0) clk_put(slim_rproc->clks[clk]); return err; }

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static void slim_clk_disable(struct st_slim_rproc *slim_rproc) { int clk; for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) clk_disable_unprepare(slim_rproc->clks[clk]); }

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static int slim_clk_enable(struct st_slim_rproc *slim_rproc) { int clk, ret; for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) { ret = clk_prepare_enable(slim_rproc->clks[clk]); if (ret) goto err_disable_clks; } return 0; err_disable_clks: while (--clk >= 0) clk_disable_unprepare(slim_rproc->clks[clk]); return ret; }

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/* * Remoteproc slim specific device handlers */
static int slim_rproc_start(struct rproc *rproc) { struct device *dev = &rproc->dev; struct st_slim_rproc *slim_rproc = rproc->priv; unsigned long hw_id, hw_ver, fw_rev; u32 val; /* disable CPU pipeline clock & reset CPU pipeline */ val = SLIM_CLK_GATE_DIS | SLIM_CLK_GATE_RESET; writel(val, slim_rproc->slimcore + SLIM_CLK_GATE_OFST); /* disable SLIM core STBus sync */ writel(SLIM_STBUS_SYNC_DIS, slim_rproc->peri + SLIM_STBUS_SYNC_OFST); /* enable cpu pipeline clock */ writel(!SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST); /* clear int & cmd mailbox */ writel(~0U, slim_rproc->peri + SLIM_INT_CLR_OFST); writel(~0U, slim_rproc->peri + SLIM_CMD_CLR_OFST); /* enable all channels cmd & int */ writel(~0U, slim_rproc->peri + SLIM_INT_MASK_OFST); writel(~0U, slim_rproc->peri + SLIM_CMD_MASK_OFST); /* enable cpu */ writel(SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST); hw_id = readl_relaxed(slim_rproc->slimcore + SLIM_ID_OFST); hw_ver = readl_relaxed(slim_rproc->slimcore + SLIM_VER_OFST); fw_rev = readl(slim_rproc->mem[ST_SLIM_DMEM].cpu_addr + SLIM_REV_ID_OFST); dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n", SLIM_REV_ID_MAJ(fw_rev), SLIM_REV_ID_MIN(fw_rev), hw_id, hw_ver); return 0; }

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static int slim_rproc_stop(struct rproc *rproc) { struct st_slim_rproc *slim_rproc = rproc->priv; u32 val; /* mask all (cmd & int) channels */ writel(0UL, slim_rproc->peri + SLIM_INT_MASK_OFST); writel(0UL, slim_rproc->peri + SLIM_CMD_MASK_OFST); /* disable cpu pipeline clock */ writel(SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST); writel(!SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST); val = readl(slim_rproc->slimcore + SLIM_EN_OFST); if (val & SLIM_EN_RUN) dev_warn(&rproc->dev, "Failed to disable SLIM"); dev_dbg(&rproc->dev, "slim stopped\n"); return 0; }

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static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, int len) { struct st_slim_rproc *slim_rproc = rproc->priv; void *va = NULL; int i; for (i = 0; i < ST_SLIM_MEM_MAX; i++) { if (da != slim_rproc->mem[i].bus_addr) continue; if (len <= slim_rproc->mem[i].size) { /* __force to make sparse happy with type conversion */ va = (__force void *)slim_rproc->mem[i].cpu_addr; break; } } dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va); return va; }

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static const struct rproc_ops slim_rproc_ops = { .start = slim_rproc_start, .stop = slim_rproc_stop, .da_to_va = slim_rproc_da_to_va, }; /* * Firmware handler operations: sanity, boot address, load ... */ static struct resource_table empty_rsc_tbl = { .ver = 1, .num = 0, };
static struct resource_table *slim_rproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw, int *tablesz) { *tablesz = sizeof(empty_rsc_tbl); return &empty_rsc_tbl; }

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static struct rproc_fw_ops slim_rproc_fw_ops = { .find_rsc_table = slim_rproc_find_rsc_table, }; /** * st_slim_rproc_alloc() - allocate and initialise slim rproc * @pdev: Pointer to the platform_device struct * @fw_name: Name of firmware for rproc to use * * Function for allocating and initialising a slim rproc for use by * device drivers whose IP is based around the SLIM core. It * obtains and enables any clocks required by the SLIM core and also * ioremaps the various IO. * * Returns st_slim_rproc pointer or PTR_ERR() on error. */
struct st_slim_rproc *st_slim_rproc_alloc(struct platform_device *pdev, char *fw_name) { struct device *dev = &pdev->dev; struct st_slim_rproc *slim_rproc; struct device_node *np = dev->of_node; struct rproc *rproc; struct resource *res; int err, i; const struct rproc_fw_ops *elf_ops; if (!fw_name) return ERR_PTR(-EINVAL); if (!of_device_is_compatible(np, "st,slim-rproc")) return ERR_PTR(-EINVAL); rproc = rproc_alloc(dev, np->name, &slim_rproc_ops, fw_name, sizeof(*slim_rproc)); if (!rproc) return ERR_PTR(-ENOMEM); rproc->has_iommu = false; slim_rproc = rproc->priv; slim_rproc->rproc = rproc; elf_ops = rproc->fw_ops; /* Use some generic elf ops */ slim_rproc_fw_ops.load = elf_ops->load; slim_rproc_fw_ops.sanity_check = elf_ops->sanity_check; rproc->fw_ops = &slim_rproc_fw_ops; /* get imem and dmem */ for (i = 0; i < ARRAY_SIZE(mem_names); i++) { res = platform_get_resource_byname(pdev, IORESOURCE_MEM, mem_names[i]); slim_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res); if (IS_ERR(slim_rproc->mem[i].cpu_addr)) { dev_err(&pdev->dev, "devm_ioremap_resource failed\n"); err = PTR_ERR(slim_rproc->mem[i].cpu_addr); goto err; } slim_rproc->mem[i].bus_addr = res->start; slim_rproc->mem[i].size = resource_size(res); } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slimcore"); slim_rproc->slimcore = devm_ioremap_resource(dev, res); if (IS_ERR(slim_rproc->slimcore)) { dev_err(&pdev->dev, "failed to ioremap slimcore IO\n"); err = PTR_ERR(slim_rproc->slimcore); goto err; } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "peripherals"); slim_rproc->peri = devm_ioremap_resource(dev, res); if (IS_ERR(slim_rproc->peri)) { dev_err(&pdev->dev, "failed to ioremap peripherals IO\n"); err = PTR_ERR(slim_rproc->peri); goto err; } err = slim_clk_get(slim_rproc, dev); if (err) goto err; err = slim_clk_enable(slim_rproc); if (err) { dev_err(dev, "Failed to enable clocks\n"); goto err_clk_put; } /* Register as a remoteproc device */ err = rproc_add(rproc); if (err) { dev_err(dev, "registration of slim remoteproc failed\n"); goto err_clk_dis; } return slim_rproc; err_clk_dis: slim_clk_disable(slim_rproc); err_clk_put: for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++) clk_put(slim_rproc->clks[i]); err: rproc_free(rproc); return ERR_PTR(err); }

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EXPORT_SYMBOL(st_slim_rproc_alloc); /** * st_slim_rproc_put() - put slim rproc resources * @slim_rproc: Pointer to the st_slim_rproc struct * * Function for calling respective _put() functions on slim_rproc resources. * */
void st_slim_rproc_put(struct st_slim_rproc *slim_rproc) { int clk; if (!slim_rproc) return; slim_clk_disable(slim_rproc); for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) clk_put(slim_rproc->clks[clk]); rproc_del(slim_rproc->rproc); rproc_free(slim_rproc->rproc); }

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EXPORT_SYMBOL(st_slim_rproc_put); MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>"); MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver"); MODULE_LICENSE("GPL v2");

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