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335 lines
8.3 KiB
335 lines
8.3 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver"); |
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MODULE_LICENSE("GPL v2");
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