diff options
| -rw-r--r-- | drivers/remoteproc/pru_rproc.c | 181 | ||||
| -rw-r--r-- | drivers/remoteproc/pru_rproc.h | 46 |
2 files changed, 227 insertions, 0 deletions
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index d33392bbd8af..72e64d15f0dc 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -11,13 +11,16 @@ */ #include <linux/bitops.h> +#include <linux/irqdomain.h> #include <linux/module.h> #include <linux/of_device.h> +#include <linux/of_irq.h> #include <linux/pruss_driver.h> #include <linux/remoteproc.h> #include "remoteproc_internal.h" #include "remoteproc_elf_helpers.h" +#include "pru_rproc.h" /* PRU_ICSS_PRU_CTRL registers */ #define PRU_CTRL_CTRL 0x0000 @@ -42,6 +45,8 @@ #define PRU_SDRAM_DA 0x2000 /* Secondary Data RAM */ #define PRU_SHRDRAM_DA 0x10000 /* Shared Data RAM */ +#define MAX_PRU_SYS_EVENTS 160 + /** * enum pru_iomem - PRU core memory/register range identifiers * @@ -65,6 +70,10 @@ enum pru_iomem { * @rproc: remoteproc pointer for this PRU core * @mem_regions: data for each of the PRU memory regions * @fw_name: name of firmware image used during loading + * @mapped_irq: virtual interrupt numbers of created fw specific mapping + * @pru_interrupt_map: pointer to interrupt mapping description (firmware) + * @pru_interrupt_map_sz: pru_interrupt_map size + * @evt_count: number of mapped events */ struct pru_rproc { int id; @@ -73,6 +82,10 @@ struct pru_rproc { struct rproc *rproc; struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; const char *fw_name; + unsigned int *mapped_irq; + struct pru_irq_rsc *pru_interrupt_map; + size_t pru_interrupt_map_sz; + u8 evt_count; }; static inline u32 pru_control_read_reg(struct pru_rproc *pru, unsigned int reg) @@ -86,15 +99,108 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); } +static void pru_dispose_irq_mapping(struct pru_rproc *pru) +{ + while (pru->evt_count--) { + if (pru->mapped_irq[pru->evt_count] > 0) + irq_dispose_mapping(pru->mapped_irq[pru->evt_count]); + } + + kfree(pru->mapped_irq); +} + +/* + * Parse the custom PRU interrupt map resource and configure the INTC + * appropriately. + */ +static int pru_handle_intrmap(struct rproc *rproc) +{ + struct device *dev = rproc->dev.parent; + struct pru_rproc *pru = rproc->priv; + struct pru_irq_rsc *rsc = pru->pru_interrupt_map; + struct irq_fwspec fwspec; + struct device_node *irq_parent; + int i, ret = 0; + + /* not having pru_interrupt_map is not an error */ + if (!rsc) + return 0; + + /* currently supporting only type 0 */ + if (rsc->type != 0) { + dev_err(dev, "unsupported rsc type: %d\n", rsc->type); + return -EINVAL; + } + + if (rsc->num_evts > MAX_PRU_SYS_EVENTS) + return -EINVAL; + + if (sizeof(*rsc) + rsc->num_evts * sizeof(struct pruss_int_map) != + pru->pru_interrupt_map_sz) + return -EINVAL; + + pru->evt_count = rsc->num_evts; + pru->mapped_irq = kcalloc(pru->evt_count, sizeof(unsigned int), + GFP_KERNEL); + if (!pru->mapped_irq) + return -ENOMEM; + + /* + * parse and fill in system event to interrupt channel and + * channel-to-host mapping + */ + irq_parent = of_irq_find_parent(pru->dev->of_node); + if (!irq_parent) { + kfree(pru->mapped_irq); + return -ENODEV; + } + + fwspec.fwnode = of_node_to_fwnode(irq_parent); + fwspec.param_count = 3; + for (i = 0; i < pru->evt_count; i++) { + fwspec.param[0] = rsc->pru_intc_map[i].event; + fwspec.param[1] = rsc->pru_intc_map[i].chnl; + fwspec.param[2] = rsc->pru_intc_map[i].host; + + dev_dbg(dev, "mapping%d: event %d, chnl %d, host %d\n", + i, fwspec.param[0], fwspec.param[1], fwspec.param[2]); + + pru->mapped_irq[i] = irq_create_fwspec_mapping(&fwspec); + if (!pru->mapped_irq[i]) { + dev_err(dev, "failed to get virq\n"); + ret = pru->mapped_irq[i]; + goto map_fail; + } + } + + return ret; + +map_fail: + pru_dispose_irq_mapping(pru); + + return ret; +} + static int pru_rproc_start(struct rproc *rproc) { struct device *dev = &rproc->dev; struct pru_rproc *pru = rproc->priv; u32 val; + int ret; dev_dbg(dev, "starting PRU%d: entry-point = 0x%llx\n", pru->id, (rproc->bootaddr >> 2)); + ret = pru_handle_intrmap(rproc); + /* + * reset references to pru interrupt map - they will stop being valid + * after rproc_start returns + */ + pru->pru_interrupt_map = NULL; + pru->pru_interrupt_map_sz = 0; + if (ret) + return ret; + val = CTRL_CTRL_EN | ((rproc->bootaddr >> 2) << 16); pru_control_write_reg(pru, PRU_CTRL_CTRL, val); @@ -113,6 +219,10 @@ static int pru_rproc_stop(struct rproc *rproc) val &= ~CTRL_CTRL_EN; pru_control_write_reg(pru, PRU_CTRL_CTRL, val); + /* dispose irq mapping - new firmware can provide new mapping */ + if (pru->mapped_irq) + pru_dispose_irq_mapping(pru); + return 0; } @@ -273,12 +383,70 @@ pru_rproc_load_elf_segments(struct rproc *rproc, const struct firmware *fw) return ret; } +static const void * +pru_rproc_find_interrupt_map(struct device *dev, const struct firmware *fw) +{ + struct elf32_shdr *shdr, *name_table_shdr; + const char *name_table; + const u8 *elf_data = fw->data; + struct elf32_hdr *ehdr = (struct elf32_hdr *)elf_data; + u16 shnum = ehdr->e_shnum; + u16 shstrndx = ehdr->e_shstrndx; + int i; + + /* first, get the section header */ + shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff); + /* compute name table section header entry in shdr array */ + name_table_shdr = shdr + shstrndx; + /* finally, compute the name table section address in elf */ + name_table = elf_data + name_table_shdr->sh_offset; + + for (i = 0; i < shnum; i++, shdr++) { + u32 size = shdr->sh_size; + u32 offset = shdr->sh_offset; + u32 name = shdr->sh_name; + + if (strcmp(name_table + name, ".pru_irq_map")) + continue; + + /* make sure we have the entire irq map */ + if (offset + size > fw->size || offset + size < size) { + dev_err(dev, ".pru_irq_map section truncated\n"); + return ERR_PTR(-EINVAL); + } + + /* make sure irq map has at least the header */ + if (sizeof(struct pru_irq_rsc) > size) { + dev_err(dev, "header-less .pru_irq_map section\n"); + return ERR_PTR(-EINVAL); + } + + return shdr; + } + + dev_dbg(dev, "no .pru_irq_map section found for this fw\n"); + + return NULL; +} + /* * Use a custom parse_fw callback function for dealing with PRU firmware * specific sections. + * + * The firmware blob can contain optional ELF sections: .resource_table section + * and .pru_irq_map one. The second one contains the PRUSS interrupt mapping + * description, which needs to be setup before powering on the PRU core. To + * avoid RAM wastage this ELF section is not mapped to any ELF segment (by the + * firmware linker) and therefore is not loaded to PRU memory. */ static int pru_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw) { + struct device *dev = &rproc->dev; + struct pru_rproc *pru = rproc->priv; + const u8 *elf_data = fw->data; + const void *shdr; + u8 class = fw_elf_get_class(fw); + u64 sh_offset; int ret; /* load optional rsc table */ @@ -288,6 +456,19 @@ static int pru_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw) else if (ret) return ret; + /* find .pru_interrupt_map section, not having it is not an error */ + shdr = pru_rproc_find_interrupt_map(dev, fw); + if (IS_ERR(shdr)) + return PTR_ERR(shdr); + + if (!shdr) + return 0; + + /* preserve pointer to PRU interrupt map together with it size */ + sh_offset = elf_shdr_get_sh_offset(class, shdr); + pru->pru_interrupt_map = (struct pru_irq_rsc *)(elf_data + sh_offset); + pru->pru_interrupt_map_sz = elf_shdr_get_sh_size(class, shdr); + return 0; } diff --git a/drivers/remoteproc/pru_rproc.h b/drivers/remoteproc/pru_rproc.h new file mode 100644 index 000000000000..8ee9c3171610 --- /dev/null +++ b/drivers/remoteproc/pru_rproc.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */ +/* + * PRUSS Remote Processor specific types + * + * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ + * Suman Anna <s-anna@ti.com> + */ + +#ifndef _PRU_RPROC_H_ +#define _PRU_RPROC_H_ + +/** + * struct pruss_int_map - PRU system events _to_ channel and host mapping + * @event: number of the system event + * @chnl: channel number assigned to a given @event + * @host: host number assigned to a given @chnl + * + * PRU system events are mapped to channels, and these channels are mapped + * to host interrupts. Events can be mapped to channels in a one-to-one or + * many-to-one ratio (multiple events per channel), and channels can be + * mapped to host interrupts in a one-to-one or many-to-one ratio (multiple + * channels per interrupt). + */ +struct pruss_int_map { + u8 event; + u8 chnl; + u8 host; +}; + +/** + * struct pru_irq_rsc - PRU firmware section header for IRQ data + * @type: resource type + * @num_evts: number of described events + * @pru_intc_map: PRU interrupt routing description + * + * The PRU firmware blob can contain optional .pru_irq_map ELF section, which + * provides the PRUSS interrupt mapping description. The pru_irq_rsc struct + * describes resource entry format. + */ +struct pru_irq_rsc { + u8 type; + u8 num_evts; + struct pruss_int_map pru_intc_map[]; +} __packed; + +#endif /* _PRU_RPROC_H_ */ |