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- // SPDX-License-Identifier: GPL-2.0
- //
- // RPC-IF SPI/QSPI/Octa driver
- //
- // Copyright (C) 2018 ~ 2019 Renesas Solutions Corp.
- // Copyright (C) 2019 Macronix International Co., Ltd.
- // Copyright (C) 2019 - 2020 Cogent Embedded, Inc.
- //
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/spi/spi.h>
- #include <linux/spi/spi-mem.h>
- #include <memory/renesas-rpc-if.h>
- #include <asm/unaligned.h>
- static void rpcif_spi_mem_prepare(struct spi_device *spi_dev,
- const struct spi_mem_op *spi_op,
- u64 *offs, size_t *len)
- {
- struct rpcif *rpc = spi_controller_get_devdata(spi_dev->controller);
- struct rpcif_op rpc_op = { };
- rpc_op.cmd.opcode = spi_op->cmd.opcode;
- rpc_op.cmd.buswidth = spi_op->cmd.buswidth;
- if (spi_op->addr.nbytes) {
- rpc_op.addr.buswidth = spi_op->addr.buswidth;
- rpc_op.addr.nbytes = spi_op->addr.nbytes;
- rpc_op.addr.val = spi_op->addr.val;
- }
- if (spi_op->dummy.nbytes) {
- rpc_op.dummy.buswidth = spi_op->dummy.buswidth;
- rpc_op.dummy.ncycles = spi_op->dummy.nbytes * 8 /
- spi_op->dummy.buswidth;
- }
- if (spi_op->data.nbytes || (offs && len)) {
- rpc_op.data.buswidth = spi_op->data.buswidth;
- rpc_op.data.nbytes = spi_op->data.nbytes;
- switch (spi_op->data.dir) {
- case SPI_MEM_DATA_IN:
- rpc_op.data.dir = RPCIF_DATA_IN;
- rpc_op.data.buf.in = spi_op->data.buf.in;
- break;
- case SPI_MEM_DATA_OUT:
- rpc_op.data.dir = RPCIF_DATA_OUT;
- rpc_op.data.buf.out = spi_op->data.buf.out;
- break;
- case SPI_MEM_NO_DATA:
- rpc_op.data.dir = RPCIF_NO_DATA;
- break;
- }
- } else {
- rpc_op.data.dir = RPCIF_NO_DATA;
- }
- rpcif_prepare(rpc, &rpc_op, offs, len);
- }
- static bool rpcif_spi_mem_supports_op(struct spi_mem *mem,
- const struct spi_mem_op *op)
- {
- if (!spi_mem_default_supports_op(mem, op))
- return false;
- if (op->data.buswidth > 4 || op->addr.buswidth > 4 ||
- op->dummy.buswidth > 4 || op->cmd.buswidth > 4 ||
- op->addr.nbytes > 4)
- return false;
- return true;
- }
- static ssize_t rpcif_spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
- u64 offs, size_t len, void *buf)
- {
- struct rpcif *rpc =
- spi_controller_get_devdata(desc->mem->spi->controller);
- if (offs + desc->info.offset + len > U32_MAX)
- return -EINVAL;
- rpcif_spi_mem_prepare(desc->mem->spi, &desc->info.op_tmpl, &offs, &len);
- return rpcif_dirmap_read(rpc, offs, len, buf);
- }
- static int rpcif_spi_mem_dirmap_create(struct spi_mem_dirmap_desc *desc)
- {
- struct rpcif *rpc =
- spi_controller_get_devdata(desc->mem->spi->controller);
- if (desc->info.offset + desc->info.length > U32_MAX)
- return -ENOTSUPP;
- if (!rpcif_spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))
- return -ENOTSUPP;
- if (!rpc->dirmap && desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN)
- return -ENOTSUPP;
- if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT)
- return -ENOTSUPP;
- return 0;
- }
- static int rpcif_spi_mem_exec_op(struct spi_mem *mem,
- const struct spi_mem_op *op)
- {
- struct rpcif *rpc =
- spi_controller_get_devdata(mem->spi->controller);
- rpcif_spi_mem_prepare(mem->spi, op, NULL, NULL);
- return rpcif_manual_xfer(rpc);
- }
- static const struct spi_controller_mem_ops rpcif_spi_mem_ops = {
- .supports_op = rpcif_spi_mem_supports_op,
- .exec_op = rpcif_spi_mem_exec_op,
- .dirmap_create = rpcif_spi_mem_dirmap_create,
- .dirmap_read = rpcif_spi_mem_dirmap_read,
- };
- static int rpcif_spi_probe(struct platform_device *pdev)
- {
- struct device *parent = pdev->dev.parent;
- struct spi_controller *ctlr;
- struct rpcif *rpc;
- int error;
- ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*rpc));
- if (!ctlr)
- return -ENOMEM;
- rpc = spi_controller_get_devdata(ctlr);
- error = rpcif_sw_init(rpc, parent);
- if (error)
- return error;
- platform_set_drvdata(pdev, ctlr);
- ctlr->dev.of_node = parent->of_node;
- rpcif_enable_rpm(rpc);
- ctlr->num_chipselect = 1;
- ctlr->mem_ops = &rpcif_spi_mem_ops;
- ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
- ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_QUAD | SPI_RX_QUAD;
- ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;
- error = rpcif_hw_init(rpc, false);
- if (error)
- goto out_disable_rpm;
- error = spi_register_controller(ctlr);
- if (error) {
- dev_err(&pdev->dev, "spi_register_controller failed\n");
- goto out_disable_rpm;
- }
- return 0;
- out_disable_rpm:
- rpcif_disable_rpm(rpc);
- return error;
- }
- static int rpcif_spi_remove(struct platform_device *pdev)
- {
- struct spi_controller *ctlr = platform_get_drvdata(pdev);
- struct rpcif *rpc = spi_controller_get_devdata(ctlr);
- spi_unregister_controller(ctlr);
- rpcif_disable_rpm(rpc);
- return 0;
- }
- static int __maybe_unused rpcif_spi_suspend(struct device *dev)
- {
- struct spi_controller *ctlr = dev_get_drvdata(dev);
- return spi_controller_suspend(ctlr);
- }
- static int __maybe_unused rpcif_spi_resume(struct device *dev)
- {
- struct spi_controller *ctlr = dev_get_drvdata(dev);
- return spi_controller_resume(ctlr);
- }
- static SIMPLE_DEV_PM_OPS(rpcif_spi_pm_ops, rpcif_spi_suspend, rpcif_spi_resume);
- static struct platform_driver rpcif_spi_driver = {
- .probe = rpcif_spi_probe,
- .remove = rpcif_spi_remove,
- .driver = {
- .name = "rpc-if-spi",
- #ifdef CONFIG_PM_SLEEP
- .pm = &rpcif_spi_pm_ops,
- #endif
- },
- };
- module_platform_driver(rpcif_spi_driver);
- MODULE_DESCRIPTION("Renesas RPC-IF SPI driver");
- MODULE_LICENSE("GPL v2");
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