// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SLIM core rproc driver
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*
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* Copyright (C) 2016 STMicroelectronics
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*
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* Author: Peter Griffin <peter.griffin@linaro.org>
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/remoteproc.h>
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#include <linux/remoteproc/st_slim_rproc.h>
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#include "remoteproc_internal.h"
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/* SLIM core registers */
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#define SLIM_ID_OFST 0x0
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#define SLIM_VER_OFST 0x4
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#define SLIM_EN_OFST 0x8
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#define SLIM_EN_RUN BIT(0)
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#define SLIM_CLK_GATE_OFST 0xC
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#define SLIM_CLK_GATE_DIS BIT(0)
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#define SLIM_CLK_GATE_RESET BIT(2)
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#define SLIM_SLIM_PC_OFST 0x20
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/* DMEM registers */
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#define SLIM_REV_ID_OFST 0x0
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#define SLIM_REV_ID_MIN_MASK GENMASK(15, 8)
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#define SLIM_REV_ID_MIN(id) ((id & SLIM_REV_ID_MIN_MASK) >> 8)
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#define SLIM_REV_ID_MAJ_MASK GENMASK(23, 16)
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#define SLIM_REV_ID_MAJ(id) ((id & SLIM_REV_ID_MAJ_MASK) >> 16)
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/* peripherals registers */
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#define SLIM_STBUS_SYNC_OFST 0xF88
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#define SLIM_STBUS_SYNC_DIS BIT(0)
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#define SLIM_INT_SET_OFST 0xFD4
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#define SLIM_INT_CLR_OFST 0xFD8
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#define SLIM_INT_MASK_OFST 0xFDC
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#define SLIM_CMD_CLR_OFST 0xFC8
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#define SLIM_CMD_MASK_OFST 0xFCC
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static const char *mem_names[ST_SLIM_MEM_MAX] = {
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[ST_SLIM_DMEM] = "dmem",
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[ST_SLIM_IMEM] = "imem",
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};
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static int slim_clk_get(struct st_slim_rproc *slim_rproc, struct device *dev)
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{
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int clk, err;
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for (clk = 0; clk < ST_SLIM_MAX_CLK; clk++) {
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slim_rproc->clks[clk] = of_clk_get(dev->of_node, clk);
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if (IS_ERR(slim_rproc->clks[clk])) {
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err = PTR_ERR(slim_rproc->clks[clk]);
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if (err == -EPROBE_DEFER)
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goto err_put_clks;
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slim_rproc->clks[clk] = NULL;
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break;
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}
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}
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return 0;
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err_put_clks:
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while (--clk >= 0)
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clk_put(slim_rproc->clks[clk]);
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return err;
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}
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static void slim_clk_disable(struct st_slim_rproc *slim_rproc)
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{
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int clk;
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for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
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clk_disable_unprepare(slim_rproc->clks[clk]);
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}
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static int slim_clk_enable(struct st_slim_rproc *slim_rproc)
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{
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int clk, ret;
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for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) {
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ret = clk_prepare_enable(slim_rproc->clks[clk]);
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if (ret)
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goto err_disable_clks;
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}
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return 0;
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err_disable_clks:
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while (--clk >= 0)
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clk_disable_unprepare(slim_rproc->clks[clk]);
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return ret;
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}
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/*
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* Remoteproc slim specific device handlers
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*/
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static int slim_rproc_start(struct rproc *rproc)
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{
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struct device *dev = &rproc->dev;
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struct st_slim_rproc *slim_rproc = rproc->priv;
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unsigned long hw_id, hw_ver, fw_rev;
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u32 val;
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/* disable CPU pipeline clock & reset CPU pipeline */
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val = SLIM_CLK_GATE_DIS | SLIM_CLK_GATE_RESET;
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writel(val, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
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/* disable SLIM core STBus sync */
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writel(SLIM_STBUS_SYNC_DIS, slim_rproc->peri + SLIM_STBUS_SYNC_OFST);
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/* enable cpu pipeline clock */
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writel(!SLIM_CLK_GATE_DIS,
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slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
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/* clear int & cmd mailbox */
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writel(~0U, slim_rproc->peri + SLIM_INT_CLR_OFST);
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writel(~0U, slim_rproc->peri + SLIM_CMD_CLR_OFST);
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/* enable all channels cmd & int */
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writel(~0U, slim_rproc->peri + SLIM_INT_MASK_OFST);
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writel(~0U, slim_rproc->peri + SLIM_CMD_MASK_OFST);
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/* enable cpu */
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writel(SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
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hw_id = readl_relaxed(slim_rproc->slimcore + SLIM_ID_OFST);
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hw_ver = readl_relaxed(slim_rproc->slimcore + SLIM_VER_OFST);
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fw_rev = readl(slim_rproc->mem[ST_SLIM_DMEM].cpu_addr +
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SLIM_REV_ID_OFST);
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dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n",
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SLIM_REV_ID_MAJ(fw_rev), SLIM_REV_ID_MIN(fw_rev),
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hw_id, hw_ver);
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return 0;
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}
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static int slim_rproc_stop(struct rproc *rproc)
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{
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struct st_slim_rproc *slim_rproc = rproc->priv;
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u32 val;
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/* mask all (cmd & int) channels */
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writel(0UL, slim_rproc->peri + SLIM_INT_MASK_OFST);
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writel(0UL, slim_rproc->peri + SLIM_CMD_MASK_OFST);
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/* disable cpu pipeline clock */
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writel(SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
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writel(!SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
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val = readl(slim_rproc->slimcore + SLIM_EN_OFST);
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if (val & SLIM_EN_RUN)
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dev_warn(&rproc->dev, "Failed to disable SLIM");
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dev_dbg(&rproc->dev, "slim stopped\n");
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return 0;
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}
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static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
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{
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struct st_slim_rproc *slim_rproc = rproc->priv;
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void *va = NULL;
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int i;
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for (i = 0; i < ST_SLIM_MEM_MAX; i++) {
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if (da != slim_rproc->mem[i].bus_addr)
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continue;
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if (len <= slim_rproc->mem[i].size) {
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/* __force to make sparse happy with type conversion */
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va = (__force void *)slim_rproc->mem[i].cpu_addr;
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break;
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}
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}
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dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%zx va = 0x%pK\n",
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da, len, va);
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return va;
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}
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static const struct rproc_ops slim_rproc_ops = {
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.start = slim_rproc_start,
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.stop = slim_rproc_stop,
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.da_to_va = slim_rproc_da_to_va,
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.get_boot_addr = rproc_elf_get_boot_addr,
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.load = rproc_elf_load_segments,
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.sanity_check = rproc_elf_sanity_check,
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};
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/**
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* st_slim_rproc_alloc() - allocate and initialise slim rproc
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* @pdev: Pointer to the platform_device struct
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* @fw_name: Name of firmware for rproc to use
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*
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* Function for allocating and initialising a slim rproc for use by
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* device drivers whose IP is based around the SLIM core. It
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* obtains and enables any clocks required by the SLIM core and also
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* ioremaps the various IO.
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*
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* Returns st_slim_rproc pointer or PTR_ERR() on error.
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*/
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struct st_slim_rproc *st_slim_rproc_alloc(struct platform_device *pdev,
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char *fw_name)
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{
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struct device *dev = &pdev->dev;
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struct st_slim_rproc *slim_rproc;
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struct device_node *np = dev->of_node;
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struct rproc *rproc;
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struct resource *res;
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int err, i;
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if (!fw_name)
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return ERR_PTR(-EINVAL);
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if (!of_device_is_compatible(np, "st,slim-rproc"))
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return ERR_PTR(-EINVAL);
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rproc = rproc_alloc(dev, np->name, &slim_rproc_ops,
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fw_name, sizeof(*slim_rproc));
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if (!rproc)
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return ERR_PTR(-ENOMEM);
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rproc->has_iommu = false;
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slim_rproc = rproc->priv;
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slim_rproc->rproc = rproc;
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/* get imem and dmem */
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for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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mem_names[i]);
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slim_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
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if (IS_ERR(slim_rproc->mem[i].cpu_addr)) {
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dev_err(&pdev->dev, "devm_ioremap_resource failed\n");
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err = PTR_ERR(slim_rproc->mem[i].cpu_addr);
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goto err;
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}
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slim_rproc->mem[i].bus_addr = res->start;
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slim_rproc->mem[i].size = resource_size(res);
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slimcore");
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slim_rproc->slimcore = devm_ioremap_resource(dev, res);
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if (IS_ERR(slim_rproc->slimcore)) {
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dev_err(&pdev->dev, "failed to ioremap slimcore IO\n");
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err = PTR_ERR(slim_rproc->slimcore);
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goto err;
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "peripherals");
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slim_rproc->peri = devm_ioremap_resource(dev, res);
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if (IS_ERR(slim_rproc->peri)) {
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dev_err(&pdev->dev, "failed to ioremap peripherals IO\n");
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err = PTR_ERR(slim_rproc->peri);
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goto err;
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}
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err = slim_clk_get(slim_rproc, dev);
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if (err)
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goto err;
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err = slim_clk_enable(slim_rproc);
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if (err) {
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dev_err(dev, "Failed to enable clocks\n");
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goto err_clk_put;
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}
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/* Register as a remoteproc device */
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err = rproc_add(rproc);
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if (err) {
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dev_err(dev, "registration of slim remoteproc failed\n");
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goto err_clk_dis;
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}
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return slim_rproc;
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err_clk_dis:
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slim_clk_disable(slim_rproc);
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err_clk_put:
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for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++)
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clk_put(slim_rproc->clks[i]);
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err:
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rproc_free(rproc);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL(st_slim_rproc_alloc);
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/**
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* st_slim_rproc_put() - put slim rproc resources
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* @slim_rproc: Pointer to the st_slim_rproc struct
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*
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* Function for calling respective _put() functions on slim_rproc resources.
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*
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*/
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void st_slim_rproc_put(struct st_slim_rproc *slim_rproc)
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{
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int clk;
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if (!slim_rproc)
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return;
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slim_clk_disable(slim_rproc);
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for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
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clk_put(slim_rproc->clks[clk]);
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rproc_del(slim_rproc->rproc);
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rproc_free(slim_rproc->rproc);
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}
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EXPORT_SYMBOL(st_slim_rproc_put);
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MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
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MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver");
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MODULE_LICENSE("GPL v2");
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