/* * ST's Remote Processor Control Driver * * Copyright (C) 2015 STMicroelectronics - All Rights Reserved * * Author: Ludovic Barre <ludovic.barre@st.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/clk.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/mailbox_client.h> #include <linux/mfd/syscon.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_reserved_mem.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/remoteproc.h> #include <linux/reset.h> #include "remoteproc_internal.h" #define ST_RPROC_VQ0 0 #define ST_RPROC_VQ1 1 #define ST_RPROC_MAX_VRING 2 #define MBOX_RX 0 #define MBOX_TX 1 #define MBOX_MAX 2 struct st_rproc_config { bool sw_reset; bool pwr_reset; unsigned long bootaddr_mask; }; struct st_rproc { struct st_rproc_config *config; struct reset_control *sw_reset; struct reset_control *pwr_reset; struct clk *clk; u32 clk_rate; struct regmap *boot_base; u32 boot_offset; struct mbox_chan *mbox_chan[ST_RPROC_MAX_VRING * MBOX_MAX]; struct mbox_client mbox_client_vq0; struct mbox_client mbox_client_vq1; }; static void st_rproc_mbox_callback(struct device *dev, u32 msg) { struct rproc *rproc = dev_get_drvdata(dev); if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE) dev_dbg(dev, "no message was found in vqid %d\n", msg); } static void st_rproc_mbox_callback_vq0(struct mbox_client *mbox_client, void *data) { st_rproc_mbox_callback(mbox_client->dev, 0); } static void st_rproc_mbox_callback_vq1(struct mbox_client *mbox_client, void *data) { st_rproc_mbox_callback(mbox_client->dev, 1); } static void st_rproc_kick(struct rproc *rproc, int vqid) { struct st_rproc *ddata = rproc->priv; struct device *dev = rproc->dev.parent; int ret; /* send the index of the triggered virtqueue in the mailbox payload */ if (WARN_ON(vqid >= ST_RPROC_MAX_VRING)) return; ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX], (void *)&vqid); if (ret < 0) dev_err(dev, "failed to send message via mbox: %d\n", ret); } static int st_rproc_start(struct rproc *rproc) { struct st_rproc *ddata = rproc->priv; int err; regmap_update_bits(ddata->boot_base, ddata->boot_offset, ddata->config->bootaddr_mask, rproc->bootaddr); err = clk_enable(ddata->clk); if (err) { dev_err(&rproc->dev, "Failed to enable clock\n"); return err; } if (ddata->config->sw_reset) { err = reset_control_deassert(ddata->sw_reset); if (err) { dev_err(&rproc->dev, "Failed to deassert S/W Reset\n"); goto sw_reset_fail; } } if (ddata->config->pwr_reset) { err = reset_control_deassert(ddata->pwr_reset); if (err) { dev_err(&rproc->dev, "Failed to deassert Power Reset\n"); goto pwr_reset_fail; } } dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr); return 0; pwr_reset_fail: if (ddata->config->pwr_reset) reset_control_assert(ddata->sw_reset); sw_reset_fail: clk_disable(ddata->clk); return err; } static int st_rproc_stop(struct rproc *rproc) { struct st_rproc *ddata = rproc->priv; int sw_err = 0, pwr_err = 0; if (ddata->config->sw_reset) { sw_err = reset_control_assert(ddata->sw_reset); if (sw_err) dev_err(&rproc->dev, "Failed to assert S/W Reset\n"); } if (ddata->config->pwr_reset) { pwr_err = reset_control_assert(ddata->pwr_reset); if (pwr_err) dev_err(&rproc->dev, "Failed to assert Power Reset\n"); } clk_disable(ddata->clk); return sw_err ?: pwr_err; } static const struct rproc_ops st_rproc_ops = { .kick = st_rproc_kick, .start = st_rproc_start, .stop = st_rproc_stop, }; /* * Fetch state of the processor: 0 is off, 1 is on. */ static int st_rproc_state(struct platform_device *pdev) { struct rproc *rproc = platform_get_drvdata(pdev); struct st_rproc *ddata = rproc->priv; int reset_sw = 0, reset_pwr = 0; if (ddata->config->sw_reset) reset_sw = reset_control_status(ddata->sw_reset); if (ddata->config->pwr_reset) reset_pwr = reset_control_status(ddata->pwr_reset); if (reset_sw < 0 || reset_pwr < 0) return -EINVAL; return !reset_sw && !reset_pwr; } static const struct st_rproc_config st40_rproc_cfg = { .sw_reset = true, .pwr_reset = true, .bootaddr_mask = GENMASK(28, 1), }; static const struct st_rproc_config st231_rproc_cfg = { .sw_reset = true, .pwr_reset = false, .bootaddr_mask = GENMASK(31, 6), }; static const struct of_device_id st_rproc_match[] = { { .compatible = "st,st40-rproc", .data = &st40_rproc_cfg }, { .compatible = "st,st231-rproc", .data = &st231_rproc_cfg }, {}, }; MODULE_DEVICE_TABLE(of, st_rproc_match); static int st_rproc_parse_dt(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rproc *rproc = platform_get_drvdata(pdev); struct st_rproc *ddata = rproc->priv; struct device_node *np = dev->of_node; int err; if (ddata->config->sw_reset) { ddata->sw_reset = devm_reset_control_get_exclusive(dev, "sw_reset"); if (IS_ERR(ddata->sw_reset)) { dev_err(dev, "Failed to get S/W Reset\n"); return PTR_ERR(ddata->sw_reset); } } if (ddata->config->pwr_reset) { ddata->pwr_reset = devm_reset_control_get_exclusive(dev, "pwr_reset"); if (IS_ERR(ddata->pwr_reset)) { dev_err(dev, "Failed to get Power Reset\n"); return PTR_ERR(ddata->pwr_reset); } } ddata->clk = devm_clk_get(dev, NULL); if (IS_ERR(ddata->clk)) { dev_err(dev, "Failed to get clock\n"); return PTR_ERR(ddata->clk); } err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate); if (err) { dev_err(dev, "failed to get clock frequency\n"); return err; } ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); if (IS_ERR(ddata->boot_base)) { dev_err(dev, "Boot base not found\n"); return PTR_ERR(ddata->boot_base); } err = of_property_read_u32_index(np, "st,syscfg", 1, &ddata->boot_offset); if (err) { dev_err(dev, "Boot offset not found\n"); return -EINVAL; } err = of_reserved_mem_device_init(dev); if (err) { dev_err(dev, "Failed to obtain shared memory\n"); return err; } err = clk_prepare(ddata->clk); if (err) dev_err(dev, "failed to get clock\n"); return err; } static int st_rproc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; const struct of_device_id *match; struct st_rproc *ddata; struct device_node *np = dev->of_node; struct rproc *rproc; struct mbox_chan *chan; int enabled; int ret, i; match = of_match_device(st_rproc_match, dev); if (!match || !match->data) { dev_err(dev, "No device match found\n"); return -ENODEV; } rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata)); if (!rproc) return -ENOMEM; rproc->has_iommu = false; ddata = rproc->priv; ddata->config = (struct st_rproc_config *)match->data; platform_set_drvdata(pdev, rproc); ret = st_rproc_parse_dt(pdev); if (ret) goto free_rproc; enabled = st_rproc_state(pdev); if (enabled < 0) { ret = enabled; goto free_clk; } if (enabled) { atomic_inc(&rproc->power); rproc->state = RPROC_RUNNING; } else { clk_set_rate(ddata->clk, ddata->clk_rate); } if (of_get_property(np, "mbox-names", NULL)) { ddata->mbox_client_vq0.dev = dev; ddata->mbox_client_vq0.tx_done = NULL; ddata->mbox_client_vq0.tx_block = false; ddata->mbox_client_vq0.knows_txdone = false; ddata->mbox_client_vq0.rx_callback = st_rproc_mbox_callback_vq0; ddata->mbox_client_vq1.dev = dev; ddata->mbox_client_vq1.tx_done = NULL; ddata->mbox_client_vq1.tx_block = false; ddata->mbox_client_vq1.knows_txdone = false; ddata->mbox_client_vq1.rx_callback = st_rproc_mbox_callback_vq1; /* * To control a co-processor without IPC mechanism. * This driver can be used without mbox and rpmsg. */ chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx"); if (IS_ERR(chan)) { dev_err(&rproc->dev, "failed to request mbox chan 0\n"); ret = PTR_ERR(chan); goto free_clk; } ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan; chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx"); if (IS_ERR(chan)) { dev_err(&rproc->dev, "failed to request mbox chan 0\n"); ret = PTR_ERR(chan); goto free_mbox; } ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan; chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx"); if (IS_ERR(chan)) { dev_err(&rproc->dev, "failed to request mbox chan 1\n"); ret = PTR_ERR(chan); goto free_mbox; } ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan; chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx"); if (IS_ERR(chan)) { dev_err(&rproc->dev, "failed to request mbox chan 1\n"); ret = PTR_ERR(chan); goto free_mbox; } ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan; } ret = rproc_add(rproc); if (ret) goto free_mbox; return 0; free_mbox: for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++) mbox_free_channel(ddata->mbox_chan[i]); free_clk: clk_unprepare(ddata->clk); free_rproc: rproc_free(rproc); return ret; } static int st_rproc_remove(struct platform_device *pdev) { struct rproc *rproc = platform_get_drvdata(pdev); struct st_rproc *ddata = rproc->priv; int i; rproc_del(rproc); clk_disable_unprepare(ddata->clk); of_reserved_mem_device_release(&pdev->dev); for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++) mbox_free_channel(ddata->mbox_chan[i]); rproc_free(rproc); return 0; } static struct platform_driver st_rproc_driver = { .probe = st_rproc_probe, .remove = st_rproc_remove, .driver = { .name = "st-rproc", .of_match_table = of_match_ptr(st_rproc_match), }, }; module_platform_driver(st_rproc_driver); MODULE_DESCRIPTION("ST Remote Processor Control Driver"); MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>"); MODULE_LICENSE("GPL v2");