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From 466608ee2217ce02df6df977a35c4afa6ee1e350 Mon Sep 17 00:00:00 2001
From: Dmitry Shifrin <dmitry.shifrin@cogentembedded.com>
Date: Wed, 4 Apr 2018 12:29:47 +0300
Subject: [PATCH 1/2] RPC: Hyperflash: Add devicetree support
Signed-off-by: Dmitry Shifrin <dmitry.shifrin@cogentembedded.com>
---
drivers/mtd/rpc_hyperflash.c | 142 +++++++++++++++++++++++--------------------
1 file changed, 77 insertions(+), 65 deletions(-)
diff --git a/drivers/mtd/rpc_hyperflash.c b/drivers/mtd/rpc_hyperflash.c
index cf4d56e..c15e520 100644
--- a/drivers/mtd/rpc_hyperflash.c
+++ b/drivers/mtd/rpc_hyperflash.c
@@ -15,8 +15,10 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/of.h>
+#include <linux/clk.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
+#include <linux/platform_device.h>
/* RPC */
#define RPC_BASE 0xEE200000
@@ -156,10 +158,9 @@
struct rpc_info {
struct rw_semaphore lock;
+ struct clk *clk;
void __iomem *rpc_base;
void __iomem *flash_base;
- struct resource *rpc_res;
- struct resource *flash_res;
u32 flash_id;
struct mtd_info mtd;
};
@@ -243,8 +244,6 @@ enum rpc_hf_size {
RPC_HF_SIZE_64BIT = RPC_SMENR_SPIDE(0xF),
};
-struct rpc_info *rpc_info;
-
static void rpc_hf_mode_man(struct rpc_info *info)
{
rpc_wait_tend(info);
@@ -861,8 +860,8 @@ static int rpc_hf_init_mtd(struct rpc_info *info)
rpc_hf_read_reg(info, 0x27 << 1, data, RPC_HF_SIZE_16BIT);
size = 1 << data[0];
- if (size > resource_size(info->flash_res))
- size = resource_size(info->flash_res);
+ if (size > RPC_FLASH_SIZE)
+ size = RPC_FLASH_SIZE;
if (size & (RPC_HF_ERASE_SIZE - 1)) {
retval = -EINVAL;
@@ -891,86 +890,99 @@ static int rpc_hf_init_mtd(struct rpc_info *info)
return retval;
}
-static int rpc_flash_init(void)
+static int rpc_flash_probe(struct platform_device *pdev)
{
- struct rpc_info *info;
+ struct rpc_info *rpc;
struct resource *res;
- void __iomem *base;
- int retval = -ENODEV;
-
- if (!of_machine_is_compatible("renesas,r8a7795"))
- return -ENODEV;
+ int ret;
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
+ rpc = devm_kzalloc(&pdev->dev, sizeof(*rpc), GFP_KERNEL);
+ if (!rpc)
return -ENOMEM;
- res = request_mem_region(RPC_BASE, RPC_SIZE, "RPC");
- if (!res)
- goto out_info;
+ /* ...get memory */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rpc->rpc_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(rpc->rpc_base)) {
+ dev_err(&pdev->dev, "cannot get resources\n");
+ ret = PTR_ERR(rpc->rpc_base);
+ goto error;
+ }
- info->rpc_res = res;
- base = ioremap(res->start, resource_size(res));
- if (!base)
- goto out_rpc_res;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ rpc->flash_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(rpc->flash_base)) {
+ dev_err(&pdev->dev, "cannot get resources\n");
+ ret = PTR_ERR(rpc->flash_base);
+ goto error;
+ }
- info->rpc_base = base;
- res = request_mem_region(RPC_FLASH_BASE, RPC_FLASH_SIZE, "RPC-ext");
- if (!res)
- goto out_rpc_base;
+ /* ...get clk */
+ rpc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(rpc->clk)) {
+ dev_err(&pdev->dev, "cannot get clock\n");
+ ret = PTR_ERR(rpc->clk);
+ goto error;
+ }
- info->flash_res = res;
- base = ioremap(res->start, resource_size(res));
- if (!base)
- goto out_flash_res;
+ /* ... enable clk */
+ ret = clk_prepare_enable(rpc->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "cannot prepare clock\n");
+ goto error;
+ }
+
+ platform_set_drvdata(pdev, rpc);
- info->flash_base = base;
- retval = rpc_hf_init_mtd(info);
- if (retval)
- goto out_flash_base;
+ mtd_set_of_node(&rpc->mtd, pdev->dev.of_node);
+ ret = rpc_hf_init_mtd(rpc);
+ if (ret) {
+ dev_err(&pdev->dev, "mtd device register error.\n");
+ goto error_clk_disable;
+ }
- pr_info("HyperFlash Id: %x\n", info->flash_id);
+ dev_info(&pdev->dev, "HyperFlash Id: %x\n", rpc->flash_id);
- rpc_info = info;
return 0;
-out_flash_base:
- iounmap(info->flash_base);
-out_flash_res:
- release_mem_region(info->flash_res->start,
- resource_size(info->flash_res));
-out_rpc_base:
- iounmap(info->rpc_base);
-out_rpc_res:
- release_mem_region(info->rpc_res->start,
- resource_size(info->rpc_res));
-out_info:
- kfree(info);
- return retval;
+
+error_clk_disable:
+ clk_disable_unprepare(rpc->clk);
+error:
+ return ret;
}
-static void rpc_flash_exit(void)
+static int rpc_flash_exit(struct platform_device *pdev)
{
- struct rpc_info *info = rpc_info;
+ struct rpc_info *rpc = platform_get_drvdata(pdev);
+
+ /* HW shutdown */
+ clk_disable_unprepare(rpc->clk);
+ mtd_device_unregister(&rpc->mtd);
+ return 0;
+}
- if (!info)
- return;
- rpc_info = NULL;
+static const struct of_device_id rpc_flash_of_match[] = {
+ { .compatible = "renesas,rpc-hyperflash-r8a7798" },
+ { .compatible = "renesas,rpc-hyperflash-r8a7797" },
+ { },
+};
- mtd_device_unregister(&info->mtd);
+MODULE_DEVICE_TABLE(of, rpc_flash_of_match);
- iounmap(info->flash_base);
- release_mem_region(info->flash_res->start,
- resource_size(info->flash_res));
- iounmap(info->rpc_base);
- release_mem_region(info->rpc_res->start,
- resource_size(info->rpc_res));
- kfree(info);
-}
+/* platform driver interface */
+static struct platform_driver rpc_flash_platform_driver = {
+ .probe = rpc_flash_probe,
+ .remove = rpc_flash_exit,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "rpc",
+ .of_match_table = of_match_ptr(rpc_flash_of_match),
+ },
+};
-module_init(rpc_flash_init);
-module_exit(rpc_flash_exit);
+module_platform_driver(rpc_flash_platform_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Renesas RPC HyperFlash MTD driver");
--
2.7.4
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