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// SPDX-License-Identifier: GPL-2.0
/*
* Linux driver for RPC-IF HyperFlash
*
* Copyright (C) 2019-2020 Cogent Embedded, Inc.
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/hyperbus.h>
#include <linux/mtd/mtd.h>
#include <linux/mux/consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <memory/renesas-rpc-if.h>
struct rpcif_hyperbus {
struct rpcif rpc;
struct hyperbus_ctlr ctlr;
struct hyperbus_device hbdev;
};
static const struct rpcif_op rpcif_op_tmpl = {
.cmd = {
.buswidth = 8,
.ddr = true,
},
.ocmd = {
.buswidth = 8,
.ddr = true,
},
.addr = {
.nbytes = 1,
.buswidth = 8,
.ddr = true,
},
.data = {
.buswidth = 8,
.ddr = true,
},
};
static void rpcif_hb_prepare_read(struct rpcif *rpc, void *to,
unsigned long from, ssize_t len)
{
struct rpcif_op op = rpcif_op_tmpl;
op.cmd.opcode = HYPERBUS_RW_READ | HYPERBUS_AS_MEM;
op.addr.val = from >> 1;
op.dummy.buswidth = 1;
op.dummy.ncycles = 15;
op.data.dir = RPCIF_DATA_IN;
op.data.nbytes = len;
op.data.buf.in = to;
rpcif_prepare(rpc, &op, NULL, NULL);
}
static void rpcif_hb_prepare_write(struct rpcif *rpc, unsigned long to,
void *from, ssize_t len)
{
struct rpcif_op op = rpcif_op_tmpl;
op.cmd.opcode = HYPERBUS_RW_WRITE | HYPERBUS_AS_MEM;
op.addr.val = to >> 1;
op.data.dir = RPCIF_DATA_OUT;
op.data.nbytes = len;
op.data.buf.out = from;
rpcif_prepare(rpc, &op, NULL, NULL);
}
static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr)
{
struct rpcif_hyperbus *hyperbus =
container_of(hbdev, struct rpcif_hyperbus, hbdev);
map_word data;
rpcif_hb_prepare_read(&hyperbus->rpc, &data, addr, 2);
rpcif_manual_xfer(&hyperbus->rpc);
return data.x[0];
}
static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
u16 data)
{
struct rpcif_hyperbus *hyperbus =
container_of(hbdev, struct rpcif_hyperbus, hbdev);
rpcif_hb_prepare_write(&hyperbus->rpc, addr, &data, 2);
rpcif_manual_xfer(&hyperbus->rpc);
}
static void rpcif_hb_copy_from(struct hyperbus_device *hbdev, void *to,
unsigned long from, ssize_t len)
{
struct rpcif_hyperbus *hyperbus =
container_of(hbdev, struct rpcif_hyperbus, hbdev);
rpcif_hb_prepare_read(&hyperbus->rpc, to, from, len);
rpcif_dirmap_read(&hyperbus->rpc, from, len, to);
}
static const struct hyperbus_ops rpcif_hb_ops = {
.read16 = rpcif_hb_read16,
.write16 = rpcif_hb_write16,
.copy_from = rpcif_hb_copy_from,
};
static int rpcif_hb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rpcif_hyperbus *hyperbus;
int error;
hyperbus = devm_kzalloc(dev, sizeof(*hyperbus), GFP_KERNEL);
if (!hyperbus)
return -ENOMEM;
error = rpcif_sw_init(&hyperbus->rpc, pdev->dev.parent);
if (error)
return error;
platform_set_drvdata(pdev, hyperbus);
rpcif_enable_rpm(&hyperbus->rpc);
rpcif_hw_init(&hyperbus->rpc, true);
hyperbus->hbdev.map.size = hyperbus->rpc.size;
hyperbus->hbdev.map.virt = hyperbus->rpc.dirmap;
hyperbus->ctlr.dev = dev;
hyperbus->ctlr.ops = &rpcif_hb_ops;
hyperbus->hbdev.ctlr = &hyperbus->ctlr;
hyperbus->hbdev.np = of_get_next_child(pdev->dev.parent->of_node, NULL);
error = hyperbus_register_device(&hyperbus->hbdev);
if (error)
rpcif_disable_rpm(&hyperbus->rpc);
return error;
}
static int rpcif_hb_remove(struct platform_device *pdev)
{
struct rpcif_hyperbus *hyperbus = platform_get_drvdata(pdev);
int error = hyperbus_unregister_device(&hyperbus->hbdev);
struct rpcif *rpc = dev_get_drvdata(pdev->dev.parent);
rpcif_disable_rpm(rpc);
return error;
}
static struct platform_driver rpcif_platform_driver = {
.probe = rpcif_hb_probe,
.remove = rpcif_hb_remove,
.driver = {
.name = "rpc-if-hyperflash",
},
};
module_platform_driver(rpcif_platform_driver);
MODULE_DESCRIPTION("Renesas RPC-IF HyperFlash driver");
MODULE_LICENSE("GPL v2");
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