[PATCH 3/4] drivers/mtd: docg3 refactor cascade floors structure
Robert Jarzmik
robert.jarzmik at free.fr
Mon Mar 19 18:32:21 EDT 2012
Group floors into a common cascade structure. This will provide a common
structure to store common data to all cascaded docg3 chips, like IO
addressing, locking protection.
Signed-off-by: Robert Jarzmik <robert.jarzmik at free.fr>
---
drivers/mtd/devices/docg3.c | 88 ++++++++++++++++++++++---------------------
drivers/mtd/devices/docg3.h | 18 ++++++++-
2 files changed, 61 insertions(+), 45 deletions(-)
diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index f33c130..03c9c99 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -80,14 +80,9 @@ static struct nand_ecclayout docg3_oobinfo = {
.oobavail = 8,
};
-/**
- * struct docg3_bch - BCH engine
- */
-static struct bch_control *docg3_bch;
-
static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
{
- u8 val = readb(docg3->base + reg);
+ u8 val = readb(docg3->cascade->base + reg);
trace_docg3_io(0, 8, reg, (int)val);
return val;
@@ -95,7 +90,7 @@ static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
static inline u16 doc_readw(struct docg3 *docg3, u16 reg)
{
- u16 val = readw(docg3->base + reg);
+ u16 val = readw(docg3->cascade->base + reg);
trace_docg3_io(0, 16, reg, (int)val);
return val;
@@ -103,13 +98,13 @@ static inline u16 doc_readw(struct docg3 *docg3, u16 reg)
static inline void doc_writeb(struct docg3 *docg3, u8 val, u16 reg)
{
- writeb(val, docg3->base + reg);
+ writeb(val, docg3->cascade->base + reg);
trace_docg3_io(1, 8, reg, val);
}
static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg)
{
- writew(val, docg3->base + reg);
+ writew(val, docg3->cascade->base + reg);
trace_docg3_io(1, 16, reg, val);
}
@@ -643,7 +638,8 @@ static int doc_ecc_bch_fix_data(struct docg3 *docg3, void *buf, u8 *hwecc)
for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
ecc[i] = bitrev8(hwecc[i]);
- numerrs = decode_bch(docg3_bch, NULL, DOC_ECC_BCH_COVERED_BYTES,
+ numerrs = decode_bch(docg3->cascade->bch, NULL,
+ DOC_ECC_BCH_COVERED_BYTES,
NULL, ecc, NULL, errorpos);
BUG_ON(numerrs == -EINVAL);
if (numerrs < 0)
@@ -1598,13 +1594,13 @@ static struct device_attribute doc_sys_attrs[DOC_MAX_NBFLOORS][4] = {
};
static int doc_register_sysfs(struct platform_device *pdev,
- struct mtd_info **floors)
+ struct docg3_cascade *cascade)
{
int ret = 0, floor, i = 0;
struct device *dev = &pdev->dev;
- for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS && floors[floor];
- floor++)
+ for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS &&
+ cascade->floors[floor]; floor++)
for (i = 0; !ret && i < 4; i++)
ret = device_create_file(dev, &doc_sys_attrs[floor][i]);
if (!ret)
@@ -1618,12 +1614,12 @@ static int doc_register_sysfs(struct platform_device *pdev,
}
static void doc_unregister_sysfs(struct platform_device *pdev,
- struct mtd_info **floors)
+ struct docg3_cascade *cascade)
{
struct device *dev = &pdev->dev;
int floor, i;
- for (floor = 0; floor < DOC_MAX_NBFLOORS && floors[floor];
+ for (floor = 0; floor < DOC_MAX_NBFLOORS && cascade->floors[floor];
floor++)
for (i = 0; i < 4; i++)
device_remove_file(dev, &doc_sys_attrs[floor][i]);
@@ -1832,6 +1828,7 @@ static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
* @base: the io space where the device is probed
* @floor: the floor of the probed device
* @dev: the device
+ * @cascade: the cascade of chips this devices will belong to
*
* Checks whether a device at the specified IO range, and floor is available.
*
@@ -1840,7 +1837,7 @@ static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
* launched.
*/
static struct mtd_info * __init
-doc_probe_device(void __iomem *base, int floor, struct device *dev)
+doc_probe_device(struct docg3_cascade *cascade, int floor, struct device *dev)
{
int ret, bbt_nbpages;
u16 chip_id, chip_id_inv;
@@ -1863,7 +1860,7 @@ doc_probe_device(void __iomem *base, int floor, struct device *dev)
docg3->dev = dev;
docg3->device_id = floor;
- docg3->base = base;
+ docg3->cascade = cascade;
doc_set_device_id(docg3, docg3->device_id);
if (!floor)
doc_set_asic_mode(docg3, DOC_ASICMODE_RESET);
@@ -1880,7 +1877,7 @@ doc_probe_device(void __iomem *base, int floor, struct device *dev)
switch (chip_id) {
case DOC_CHIPID_G3:
doc_info("Found a G3 DiskOnChip at addr %p, floor %d\n",
- base, floor);
+ docg3->cascade->base, floor);
break;
default:
doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id);
@@ -1925,10 +1922,12 @@ static void doc_release_device(struct mtd_info *mtd)
static int docg3_resume(struct platform_device *pdev)
{
int i;
+ struct docg3_cascade *cascade;
struct mtd_info **docg3_floors, *mtd;
struct docg3 *docg3;
- docg3_floors = platform_get_drvdata(pdev);
+ cascade = platform_get_drvdata(pdev);
+ docg3_floors = cascade->floors;
mtd = docg3_floors[0];
docg3 = mtd->priv;
@@ -1950,11 +1949,13 @@ static int docg3_resume(struct platform_device *pdev)
static int docg3_suspend(struct platform_device *pdev, pm_message_t state)
{
int floor, i;
+ struct docg3_cascade *cascade;
struct mtd_info **docg3_floors, *mtd;
struct docg3 *docg3;
u8 ctrl, pwr_down;
- docg3_floors = platform_get_drvdata(pdev);
+ cascade = platform_get_drvdata(pdev);
+ docg3_floors = cascade->floors;
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
mtd = docg3_floors[floor];
if (!mtd)
@@ -2004,7 +2005,7 @@ static int __init docg3_probe(struct platform_device *pdev)
struct resource *ress;
void __iomem *base;
int ret, floor, found = 0;
- struct mtd_info **docg3_floors;
+ struct docg3_cascade *cascade;
ret = -ENXIO;
ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -2015,17 +2016,18 @@ static int __init docg3_probe(struct platform_device *pdev)
base = ioremap(ress->start, DOC_IOSPACE_SIZE);
ret = -ENOMEM;
- docg3_floors = kzalloc(sizeof(*docg3_floors) * DOC_MAX_NBFLOORS,
- GFP_KERNEL);
- if (!docg3_floors)
+ cascade = kzalloc(sizeof(*cascade) * DOC_MAX_NBFLOORS,
+ GFP_KERNEL);
+ if (!cascade)
goto nomem1;
- docg3_bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T,
+ cascade->base = base;
+ cascade->bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T,
DOC_ECC_BCH_PRIMPOLY);
- if (!docg3_bch)
+ if (!cascade->bch)
goto nomem2;
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
- mtd = doc_probe_device(base, floor, dev);
+ mtd = doc_probe_device(cascade, floor, dev);
if (IS_ERR(mtd)) {
ret = PTR_ERR(mtd);
goto err_probe;
@@ -2036,7 +2038,7 @@ static int __init docg3_probe(struct platform_device *pdev)
else
continue;
}
- docg3_floors[floor] = mtd;
+ cascade->floors[floor] = mtd;
ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL,
0);
if (ret)
@@ -2044,26 +2046,26 @@ static int __init docg3_probe(struct platform_device *pdev)
found++;
}
- ret = doc_register_sysfs(pdev, docg3_floors);
+ ret = doc_register_sysfs(pdev, cascade);
if (ret)
goto err_probe;
if (!found)
goto notfound;
- platform_set_drvdata(pdev, docg3_floors);
- doc_dbg_register(docg3_floors[0]->priv);
+ platform_set_drvdata(pdev, cascade);
+ doc_dbg_register(cascade->floors[0]->priv);
return 0;
notfound:
ret = -ENODEV;
dev_info(dev, "No supported DiskOnChip found\n");
err_probe:
- free_bch(docg3_bch);
+ kfree(cascade->bch);
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
- if (docg3_floors[floor])
- doc_release_device(docg3_floors[floor]);
+ if (cascade->floors[floor])
+ doc_release_device(cascade->floors[floor]);
nomem2:
- kfree(docg3_floors);
+ kfree(cascade);
nomem1:
iounmap(base);
noress:
@@ -2078,19 +2080,19 @@ noress:
*/
static int __exit docg3_release(struct platform_device *pdev)
{
- struct mtd_info **docg3_floors = platform_get_drvdata(pdev);
- struct docg3 *docg3 = docg3_floors[0]->priv;
- void __iomem *base = docg3->base;
+ struct docg3_cascade *cascade = platform_get_drvdata(pdev);
+ struct docg3 *docg3 = cascade->floors[0]->priv;
+ void __iomem *base = cascade->base;
int floor;
- doc_unregister_sysfs(pdev, docg3_floors);
+ doc_unregister_sysfs(pdev, cascade);
doc_dbg_unregister(docg3);
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
- if (docg3_floors[floor])
- doc_release_device(docg3_floors[floor]);
+ if (cascade->floors[floor])
+ doc_release_device(cascade->floors[floor]);
- kfree(docg3_floors);
- free_bch(docg3_bch);
+ free_bch(docg3->cascade->bch);
+ kfree(cascade);
iounmap(base);
return 0;
}
diff --git a/drivers/mtd/devices/docg3.h b/drivers/mtd/devices/docg3.h
index db0da43..642e606 100644
--- a/drivers/mtd/devices/docg3.h
+++ b/drivers/mtd/devices/docg3.h
@@ -22,6 +22,8 @@
#ifndef _MTD_DOCG3_H
#define _MTD_DOCG3_H
+#include <linux/mtd/mtd.h>
+
/*
* Flash memory areas :
* - 0x0000 .. 0x07ff : IPL
@@ -267,9 +269,21 @@
#define DOC_LAYOUT_DPS_KEY_LENGTH 8
/**
+ * struct docg3_cascade - Cascade of 1 to 4 docg3 chips
+ * @floors: floors (ie. one physical docg3 chip is one floor)
+ * @base: IO space to access all chips in the cascade
+ * @bch: the BCH correcting control structure
+ */
+struct docg3_cascade {
+ struct mtd_info *floors[DOC_MAX_NBFLOORS];
+ void __iomem *base;
+ struct bch_control *bch;
+};
+
+/**
* struct docg3 - DiskOnChip driver private data
* @dev: the device currently under control
- * @base: mapped IO space
+ * @cascade: the cascade this device belongs to
* @device_id: number of the cascaded DoCG3 device (0, 1, 2 or 3)
* @if_cfg: if true, reads are on 16bits, else reads are on 8bits
@@ -287,7 +301,7 @@
*/
struct docg3 {
struct device *dev;
- void __iomem *base;
+ struct docg3_cascade *cascade;
unsigned int device_id:4;
unsigned int if_cfg:1;
unsigned int reliable:2;
--
1.7.5.4
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