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Date: Tue, 9 Sep 2014 11:01:51 +0900
From: Masahiro Yamada <yamada.m@...panasonic.com>
To: linux-mtd@...ts.infradead.org
Cc: Masahiro Yamada <yamada.m@...panasonic.com>,
David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Josh Triplett <josh@...htriplett.org>,
Huang Shijie <shijie8@...il.com>,
Rashika Kheria <rashika.kheria@...il.com>,
"grmoore@...era.com" <grmoore@...era.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/7] mtd: denali: fix the format of comment blocks
We should use
/*
* Blah Blah ...
* ...
*/
for multi-line comment blocks.
In addition, refactor some comments where it seems reasonable and
remove some comments where the code is clear enough such as:
/* clear interrupts */
clear_interrupts(denali);
Signed-off-by: Masahiro Yamada <yamada.m@...panasonic.com>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
---
Changes in v2: None
drivers/mtd/nand/denali.c | 311 ++++++++++++++++++++++++++++------------------
1 file changed, 188 insertions(+), 123 deletions(-)
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index da0fcc2..44a5f159 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -29,7 +29,8 @@
MODULE_LICENSE("GPL");
-/* We define a module parameter that allows the user to override
+/*
+ * We define a module parameter that allows the user to override
* the hardware and decide what timing mode should be used.
*/
#define NAND_DEFAULT_TIMINGS -1
@@ -41,8 +42,10 @@ MODULE_PARM_DESC(onfi_timing_mode, "Overrides default ONFI setting."
#define DENALI_NAND_NAME "denali-nand"
-/* We define a macro here that combines all interrupts this driver uses into
- * a single constant value, for convenience. */
+/*
+ * We define a macro here that combines all interrupts this driver uses into
+ * a single constant value, for convenience.
+ */
#define DENALI_IRQ_ALL (INTR_STATUS__DMA_CMD_COMP | \
INTR_STATUS__ECC_TRANSACTION_DONE | \
INTR_STATUS__ECC_ERR | \
@@ -54,23 +57,30 @@ MODULE_PARM_DESC(onfi_timing_mode, "Overrides default ONFI setting."
INTR_STATUS__RST_COMP | \
INTR_STATUS__ERASE_COMP)
-/* indicates whether or not the internal value for the flash bank is
- * valid or not */
+/*
+ * indicates whether or not the internal value for the flash bank is
+ * valid or not
+ */
#define CHIP_SELECT_INVALID -1
#define SUPPORT_8BITECC 1
-/* This macro divides two integers and rounds fractional values up
- * to the nearest integer value. */
+/*
+ * This macro divides two integers and rounds fractional values up
+ * to the nearest integer value.
+ */
#define CEIL_DIV(X, Y) (((X)%(Y)) ? ((X)/(Y)+1) : ((X)/(Y)))
-/* this macro allows us to convert from an MTD structure to our own
+/*
+ * this macro allows us to convert from an MTD structure to our own
* device context (denali) structure.
*/
#define mtd_to_denali(m) container_of(m, struct denali_nand_info, mtd)
-/* These constants are defined by the driver to enable common driver
- * configuration options. */
+/*
+ * These constants are defined by the driver to enable common driver
+ * configuration options.
+ */
#define SPARE_ACCESS 0x41
#define MAIN_ACCESS 0x42
#define MAIN_SPARE_ACCESS 0x43
@@ -84,8 +94,10 @@ MODULE_PARM_DESC(onfi_timing_mode, "Overrides default ONFI setting."
#define ADDR_CYCLE 1
#define STATUS_CYCLE 2
-/* this is a helper macro that allows us to
- * format the bank into the proper bits for the controller */
+/*
+ * this is a helper macro that allows us to
+ * format the bank into the proper bits for the controller
+ */
#define BANK(x) ((x) << 24)
/* forward declarations */
@@ -96,12 +108,12 @@ static void denali_irq_enable(struct denali_nand_info *denali,
uint32_t int_mask);
static uint32_t read_interrupt_status(struct denali_nand_info *denali);
-/* Certain operations for the denali NAND controller use
- * an indexed mode to read/write data. The operation is
- * performed by writing the address value of the command
- * to the device memory followed by the data. This function
+/*
+ * Certain operations for the denali NAND controller use an indexed mode to
+ * read/write data. The operation is performed by writing the address value
+ * of the command to the device memory followed by the data. This function
* abstracts this common operation.
-*/
+ */
static void index_addr(struct denali_nand_info *denali,
uint32_t address, uint32_t data)
{
@@ -117,8 +129,10 @@ static void index_addr_read_data(struct denali_nand_info *denali,
*pdata = ioread32(denali->flash_mem + 0x10);
}
-/* We need to buffer some data for some of the NAND core routines.
- * The operations manage buffering that data. */
+/*
+ * We need to buffer some data for some of the NAND core routines.
+ * The operations manage buffering that data.
+ */
static void reset_buf(struct denali_nand_info *denali)
{
denali->buf.head = denali->buf.tail = 0;
@@ -192,7 +206,8 @@ static uint16_t denali_nand_reset(struct denali_nand_info *denali)
return PASS;
}
-/* this routine calculates the ONFI timing values for a given mode and
+/*
+ * this routine calculates the ONFI timing values for a given mode and
* programs the clocking register accordingly. The mode is determined by
* the get_onfi_nand_para routine.
*/
@@ -298,9 +313,11 @@ static void nand_onfi_timing_set(struct denali_nand_info *denali,
static uint16_t get_onfi_nand_para(struct denali_nand_info *denali)
{
int i;
- /* we needn't to do a reset here because driver has already
+
+ /*
+ * we needn't to do a reset here because driver has already
* reset all the banks before
- * */
+ */
if (!(ioread32(denali->flash_reg + ONFI_TIMING_MODE) &
ONFI_TIMING_MODE__VALUE))
return FAIL;
@@ -313,8 +330,10 @@ static uint16_t get_onfi_nand_para(struct denali_nand_info *denali)
nand_onfi_timing_set(denali, i);
- /* By now, all the ONFI devices we know support the page cache */
- /* rw feature. So here we enable the pipeline_rw_ahead feature */
+ /*
+ * By now, all the ONFI devices we know support the page cache
+ * rw feature. So here we enable the pipeline_rw_ahead feature
+ */
/* iowrite32(1, denali->flash_reg + CACHE_WRITE_ENABLE); */
/* iowrite32(1, denali->flash_reg + CACHE_READ_ENABLE); */
@@ -340,8 +359,10 @@ static void get_toshiba_nand_para(struct denali_nand_info *denali)
{
uint32_t tmp;
- /* Workaround to fix a controller bug which reports a wrong */
- /* spare area size for some kind of Toshiba NAND device */
+ /*
+ * Workaround to fix a controller bug which reports a wrong
+ * spare area size for some kind of Toshiba NAND device
+ */
if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) == 4096) &&
(ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) == 64)) {
iowrite32(216, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
@@ -391,7 +412,8 @@ static void get_hynix_nand_para(struct denali_nand_info *denali,
}
}
-/* determines how many NAND chips are connected to the controller. Note for
+/*
+ * determines how many NAND chips are connected to the controller. Note for
* Intel CE4100 devices we don't support more than one device.
*/
static void find_valid_banks(struct denali_nand_info *denali)
@@ -421,7 +443,8 @@ static void find_valid_banks(struct denali_nand_info *denali)
}
if (denali->platform == INTEL_CE4100) {
- /* Platform limitations of the CE4100 device limit
+ /*
+ * Platform limitations of the CE4100 device limit
* users to a single chip solution for NAND.
* Multichip support is not enabled.
*/
@@ -449,12 +472,13 @@ static void detect_max_banks(struct denali_nand_info *denali)
static void detect_partition_feature(struct denali_nand_info *denali)
{
- /* For MRST platform, denali->fwblks represent the
+ /*
+ * For MRST platform, denali->fwblks represent the
* number of blocks firmware is taken,
* FW is in protect partition and MTD driver has no
* permission to access it. So let driver know how many
* blocks it can't touch.
- * */
+ */
if (ioread32(denali->flash_reg + FEATURES) & FEATURES__PARTITION) {
if ((ioread32(denali->flash_reg + PERM_SRC_ID(1)) &
PERM_SRC_ID__SRCID) == SPECTRA_PARTITION_ID) {
@@ -481,11 +505,11 @@ static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
"%s, Line %d, Function: %s\n",
__FILE__, __LINE__, __func__);
- /* Use read id method to get device ID and other
- * params. For some NAND chips, controller can't
- * report the correct device ID by reading from
- * DEVICE_ID register
- * */
+ /*
+ * Use read id method to get device ID and other params.
+ * For some NAND chips, controller can't report the correct
+ * device ID by reading from DEVICE_ID register
+ */
addr = (uint32_t)MODE_11 | BANK(denali->flash_bank);
index_addr(denali, (uint32_t)addr | 0, 0x90);
index_addr(denali, (uint32_t)addr | 1, 0);
@@ -524,7 +548,8 @@ static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
detect_partition_feature(denali);
- /* If the user specified to override the default timings
+ /*
+ * If the user specified to override the default timings
* with a specific ONFI mode, we apply those changes here.
*/
if (onfi_timing_mode != NAND_DEFAULT_TIMINGS)
@@ -545,7 +570,8 @@ static void denali_set_intr_modes(struct denali_nand_info *denali,
iowrite32(0, denali->flash_reg + GLOBAL_INT_ENABLE);
}
-/* validation function to verify that the controlling software is making
+/*
+ * validation function to verify that the controlling software is making
* a valid request
*/
static inline bool is_flash_bank_valid(int flash_bank)
@@ -585,7 +611,8 @@ static void denali_irq_enable(struct denali_nand_info *denali,
iowrite32(int_mask, denali->flash_reg + INTR_EN(i));
}
-/* This function only returns when an interrupt that this driver cares about
+/*
+ * This function only returns when an interrupt that this driver cares about
* occurs. This is to reduce the overhead of servicing interrupts
*/
static inline uint32_t denali_irq_detected(struct denali_nand_info *denali)
@@ -625,9 +652,9 @@ static uint32_t read_interrupt_status(struct denali_nand_info *denali)
return ioread32(denali->flash_reg + intr_status_reg);
}
-/* This is the interrupt service routine. It handles all interrupts
- * sent to this device. Note that on CE4100, this is a shared
- * interrupt.
+/*
+ * This is the interrupt service routine. It handles all interrupts
+ * sent to this device. Note that on CE4100, this is a shared interrupt.
*/
static irqreturn_t denali_isr(int irq, void *dev_id)
{
@@ -637,19 +664,21 @@ static irqreturn_t denali_isr(int irq, void *dev_id)
spin_lock(&denali->irq_lock);
- /* check to see if a valid NAND chip has
- * been selected.
- */
+ /* check to see if a valid NAND chip has been selected. */
if (is_flash_bank_valid(denali->flash_bank)) {
- /* check to see if controller generated
- * the interrupt, since this is a shared interrupt */
+ /*
+ * check to see if controller generated the interrupt,
+ * since this is a shared interrupt
+ */
irq_status = denali_irq_detected(denali);
if (irq_status != 0) {
/* handle interrupt */
/* first acknowledge it */
clear_interrupt(denali, irq_status);
- /* store the status in the device context for someone
- to read */
+ /*
+ * store the status in the device context for someone
+ * to read
+ */
denali->irq_status |= irq_status;
/* notify anyone who cares that it happened */
complete(&denali->complete);
@@ -681,8 +710,10 @@ static uint32_t wait_for_irq(struct denali_nand_info *denali, uint32_t irq_mask)
/* our interrupt was detected */
break;
} else {
- /* these are not the interrupts you are looking for -
- * need to wait again */
+ /*
+ * these are not the interrupts you are looking for -
+ * need to wait again
+ */
spin_unlock_irq(&denali->irq_lock);
retry = true;
}
@@ -698,8 +729,10 @@ static uint32_t wait_for_irq(struct denali_nand_info *denali, uint32_t irq_mask)
return intr_status;
}
-/* This helper function setups the registers for ECC and whether or not
- * the spare area will be transferred. */
+/*
+ * This helper function setups the registers for ECC and whether or not
+ * the spare area will be transferred.
+ */
static void setup_ecc_for_xfer(struct denali_nand_info *denali, bool ecc_en,
bool transfer_spare)
{
@@ -715,7 +748,8 @@ static void setup_ecc_for_xfer(struct denali_nand_info *denali, bool ecc_en,
denali->flash_reg + TRANSFER_SPARE_REG);
}
-/* sends a pipeline command operation to the controller. See the Denali NAND
+/*
+ * sends a pipeline command operation to the controller. See the Denali NAND
* controller's user guide for more information (section 4.2.3.6).
*/
static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
@@ -737,7 +771,6 @@ static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
setup_ecc_for_xfer(denali, ecc_en, transfer_spare);
- /* clear interrupts */
clear_interrupts(denali);
addr = BANK(denali->flash_bank) | denali->page;
@@ -757,9 +790,10 @@ static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
cmd = MODE_10 | addr;
index_addr(denali, (uint32_t)cmd, access_type);
- /* page 33 of the NAND controller spec indicates we should not
- use the pipeline commands in Spare area only mode. So we
- don't.
+ /*
+ * page 33 of the NAND controller spec indicates we should not
+ * use the pipeline commands in Spare area only mode.
+ * So we don't.
*/
if (access_type == SPARE_ACCESS) {
cmd = MODE_01 | addr;
@@ -768,10 +802,11 @@ static int denali_send_pipeline_cmd(struct denali_nand_info *denali,
index_addr(denali, (uint32_t)cmd,
PIPELINE_ACCESS | op | page_count);
- /* wait for command to be accepted
+ /*
+ * wait for command to be accepted
* can always use status0 bit as the
- * mask is identical for each
- * bank. */
+ * mask is identical for each bank.
+ */
irq_status = wait_for_irq(denali, irq_mask);
if (irq_status == 0) {
@@ -796,8 +831,10 @@ static int write_data_to_flash_mem(struct denali_nand_info *denali,
{
uint32_t i = 0, *buf32;
- /* verify that the len is a multiple of 4. see comment in
- * read_data_from_flash_mem() */
+ /*
+ * verify that the len is a multiple of 4.
+ * see comment in read_data_from_flash_mem()
+ */
BUG_ON((len % 4) != 0);
/* write the data to the flash memory */
@@ -814,14 +851,12 @@ static int read_data_from_flash_mem(struct denali_nand_info *denali,
{
uint32_t i = 0, *buf32;
- /* we assume that len will be a multiple of 4, if not
- * it would be nice to know about it ASAP rather than
- * have random failures...
- * This assumption is based on the fact that this
- * function is designed to be used to read flash pages,
- * which are typically multiples of 4...
+ /*
+ * we assume that len will be a multiple of 4, if not it would be nice
+ * to know about it ASAP rather than have random failures...
+ * This assumption is based on the fact that this function is designed
+ * to be used to read flash pages, which are typically multiples of 4.
*/
-
BUG_ON((len % 4) != 0);
/* transfer the data from the flash */
@@ -873,16 +908,19 @@ static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
DENALI_READ) == PASS) {
read_data_from_flash_mem(denali, buf, mtd->oobsize);
- /* wait for command to be accepted
- * can always use status0 bit as the mask is identical for each
- * bank. */
+ /*
+ * wait for command to be accepted
+ * can always use status0 bit as the
+ * mask is identical for each bank.
+ */
irq_status = wait_for_irq(denali, irq_mask);
if (irq_status == 0)
dev_err(denali->dev, "page on OOB timeout %d\n",
denali->page);
- /* We set the device back to MAIN_ACCESS here as I observed
+ /*
+ * We set the device back to MAIN_ACCESS here as I observed
* instability with the controller if you do a block erase
* and the last transaction was a SPARE_ACCESS. Block erase
* is reliable (according to the MTD test infrastructure)
@@ -894,7 +932,8 @@ static void read_oob_data(struct mtd_info *mtd, uint8_t *buf, int page)
}
}
-/* this function examines buffers to see if they contain data that
+/*
+ * this function examines buffers to see if they contain data that
* indicate that the buffer is part of an erased region of flash.
*/
static bool is_erased(uint8_t *buf, int len)
@@ -940,13 +979,14 @@ static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
err_device = ECC_ERR_DEVICE(err_correction_info);
if (ECC_ERROR_CORRECTABLE(err_correction_info)) {
- /* If err_byte is larger than ECC_SECTOR_SIZE,
+ /*
+ * If err_byte is larger than ECC_SECTOR_SIZE,
* means error happened in OOB, so we ignore
* it. It's no need for us to correct it
* err_device is represented the NAND error
* bits are happened in if there are more
* than one NAND connected.
- * */
+ */
if (err_byte < ECC_SECTOR_SIZE) {
int offset;
offset = (err_sector *
@@ -960,17 +1000,19 @@ static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,
bitflips++;
}
} else {
- /* if the error is not correctable, need to
+ /*
+ * if the error is not correctable, need to
* look at the page to see if it is an erased
* page. if so, then it's not a real ECC error
- * */
+ */
check_erased_page = true;
}
} while (!ECC_LAST_ERR(err_correction_info));
- /* Once handle all ecc errors, controller will triger
+ /*
+ * Once handle all ecc errors, controller will triger
* a ECC_TRANSACTION_DONE interrupt, so here just wait
* for a while for this interrupt
- * */
+ */
while (!(read_interrupt_status(denali) &
INTR_STATUS__ECC_TRANSACTION_DONE))
cpu_relax();
@@ -1013,12 +1055,14 @@ static void denali_setup_dma(struct denali_nand_info *denali, int op)
/* 3. set memory low address bits 23:8 */
index_addr(denali, mode | ((uint16_t)addr << 8), 0x2300);
- /* 4. interrupt when complete, burst len = 64 bytes*/
+ /* 4. interrupt when complete, burst len = 64 bytes */
index_addr(denali, mode | 0x14000, 0x2400);
}
-/* writes a page. user specifies type, and this function handles the
- * configuration details. */
+/*
+ * writes a page. user specifies type, and this function handles the
+ * configuration details.
+ */
static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, bool raw_xfer)
{
@@ -1031,8 +1075,8 @@ static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
uint32_t irq_mask = INTR_STATUS__DMA_CMD_COMP |
INTR_STATUS__PROGRAM_FAIL;
- /* if it is a raw xfer, we want to disable ecc, and send
- * the spare area.
+ /*
+ * if it is a raw xfer, we want to disable ecc and send the spare area.
* !raw_xfer - enable ecc
* raw_xfer - transfer spare
*/
@@ -1075,27 +1119,33 @@ static int write_page(struct mtd_info *mtd, struct nand_chip *chip,
/* NAND core entry points */
-/* this is the callback that the NAND core calls to write a page. Since
+/*
+ * this is the callback that the NAND core calls to write a page. Since
* writing a page with ECC or without is similar, all the work is done
* by write_page above.
- * */
+ */
static int denali_write_page(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
- /* for regular page writes, we let HW handle all the ECC
- * data written to the device. */
+ /*
+ * for regular page writes, we let HW handle all the ECC
+ * data written to the device.
+ */
return write_page(mtd, chip, buf, false);
}
-/* This is the callback that the NAND core calls to write a page without ECC.
+/*
+ * This is the callback that the NAND core calls to write a page without ECC.
* raw access is similar to ECC page writes, so all the work is done in the
* write_page() function above.
*/
static int denali_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
const uint8_t *buf, int oob_required)
{
- /* for raw page writes, we want to disable ECC and simply write
- whatever data is in the buffer. */
+ /*
+ * for raw page writes, we want to disable ECC and simply write
+ * whatever data is in the buffer.
+ */
return write_page(mtd, chip, buf, true);
}
@@ -1240,7 +1290,6 @@ static int denali_erase(struct mtd_info *mtd, int page)
uint32_t cmd = 0x0, irq_status = 0;
- /* clear interrupts */
clear_interrupts(denali);
/* setup page read request for access type */
@@ -1270,10 +1319,11 @@ static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col,
case NAND_CMD_READID:
case NAND_CMD_PARAM:
reset_buf(denali);
- /*sometimes ManufactureId read from register is not right
+ /*
+ * sometimes ManufactureId read from register is not right
* e.g. some of Micron MT29F32G08QAA MLC NAND chips
* So here we send READID cmd to NAND insteand
- * */
+ */
addr = (uint32_t)MODE_11 | BANK(denali->flash_bank);
index_addr(denali, (uint32_t)addr | 0, 0x90);
index_addr(denali, (uint32_t)addr | 1, 0);
@@ -1333,11 +1383,12 @@ static void denali_ecc_hwctl(struct mtd_info *mtd, int mode)
/* Initialization code to bring the device up to a known good state */
static void denali_hw_init(struct denali_nand_info *denali)
{
- /* tell driver how many bit controller will skip before
+ /*
+ * tell driver how many bit controller will skip before
* writing ECC code in OOB, this register may be already
* set by firmware. So we read this value out.
* if this value is 0, just let it be.
- * */
+ */
denali->bbtskipbytes = ioread32(denali->flash_reg +
SPARE_AREA_SKIP_BYTES);
detect_max_banks(denali);
@@ -1355,10 +1406,11 @@ static void denali_hw_init(struct denali_nand_info *denali)
denali_irq_init(denali);
}
-/* Althogh controller spec said SLC ECC is forceb to be 4bit,
+/*
+ * Althogh controller spec said SLC ECC is forceb to be 4bit,
* but denali controller in MRST only support 15bit and 8bit ECC
* correction
- * */
+ */
#define ECC_8BITS 14
static struct nand_ecclayout nand_8bit_oob = {
.eccbytes = 14,
@@ -1398,13 +1450,16 @@ static void denali_drv_init(struct denali_nand_info *denali)
denali->idx = 0;
/* setup interrupt handler */
- /* the completion object will be used to notify
- * the callee that the interrupt is done */
+ /*
+ * the completion object will be used to notify
+ * the callee that the interrupt is done
+ */
init_completion(&denali->complete);
- /* the spinlock will be used to synchronize the ISR
- * with any element that might be access shared
- * data (interrupt status) */
+ /*
+ * the spinlock will be used to synchronize the ISR with any
+ * element that might be access shared data (interrupt status)
+ */
spin_lock_init(&denali->irq_lock);
/* indicate that MTD has not selected a valid bank yet */
@@ -1419,7 +1474,8 @@ int denali_init(struct denali_nand_info *denali)
int ret;
if (denali->platform == INTEL_CE4100) {
- /* Due to a silicon limitation, we can only support
+ /*
+ * Due to a silicon limitation, we can only support
* ONFI timing mode 1 and below.
*/
if (onfi_timing_mode < -1 || onfi_timing_mode > 1) {
@@ -1438,8 +1494,10 @@ int denali_init(struct denali_nand_info *denali)
denali_hw_init(denali);
denali_drv_init(denali);
- /* denali_isr register is done after all the hardware
- * initilization is finished*/
+ /*
+ * denali_isr register is done after all the hardware
+ * initilization is finished
+ */
if (request_irq(denali->irq, denali_isr, IRQF_SHARED,
DENALI_NAND_NAME, denali)) {
pr_err("Spectra: Unable to allocate IRQ\n");
@@ -1458,9 +1516,11 @@ int denali_init(struct denali_nand_info *denali)
denali->nand.read_byte = denali_read_byte;
denali->nand.waitfunc = denali_waitfunc;
- /* scan for NAND devices attached to the controller
+ /*
+ * scan for NAND devices attached to the controller
* this is the first stage in a two step process to register
- * with the nand subsystem */
+ * with the nand subsystem
+ */
if (nand_scan_ident(&denali->mtd, denali->max_banks, NULL)) {
ret = -ENXIO;
goto failed_req_irq;
@@ -1492,10 +1552,10 @@ int denali_init(struct denali_nand_info *denali)
goto failed_req_irq;
}
- /* support for multi nand
- * MTD known nothing about multi nand,
- * so we should tell it the real pagesize
- * and anything necessery
+ /*
+ * support for multi nand
+ * MTD known nothing about multi nand, so we should tell it
+ * the real pagesize and anything necessery
*/
denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
denali->nand.chipsize <<= (denali->devnum - 1);
@@ -1511,9 +1571,11 @@ int denali_init(struct denali_nand_info *denali)
denali->mtd.size = denali->nand.numchips * denali->nand.chipsize;
denali->bbtskipbytes *= denali->devnum;
- /* second stage of the NAND scan
+ /*
+ * second stage of the NAND scan
* this stage requires information regarding ECC and
- * bad block management. */
+ * bad block management.
+ */
/* Bad block management */
denali->nand.bbt_td = &bbt_main_descr;
@@ -1524,7 +1586,8 @@ int denali_init(struct denali_nand_info *denali)
denali->nand.options |= NAND_SKIP_BBTSCAN;
denali->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
- /* Denali Controller only support 15bit and 8bit ECC in MRST,
+ /*
+ * Denali Controller only support 15bit and 8bit ECC in MRST,
* so just let controller do 15bit ECC for MLC and 8bit ECC for
* SLC if possible.
* */
@@ -1560,18 +1623,20 @@ int denali_init(struct denali_nand_info *denali)
denali->mtd.oobsize - denali->nand.ecc.layout->eccbytes -
denali->bbtskipbytes;
- /* Let driver know the total blocks number and
- * how many blocks contained by each nand chip.
- * blksperchip will help driver to know how many
- * blocks is taken by FW.
- * */
+ /*
+ * Let driver know the total blocks number and how many blocks
+ * contained by each nand chip. blksperchip will help driver to
+ * know how many blocks is taken by FW.
+ */
denali->totalblks = denali->mtd.size >>
denali->nand.phys_erase_shift;
denali->blksperchip = denali->totalblks / denali->nand.numchips;
- /* These functions are required by the NAND core framework, otherwise,
+ /*
+ * These functions are required by the NAND core framework, otherwise,
* the NAND core will assert. However, we don't need them, so we'll stub
- * them out. */
+ * them out.
+ */
denali->nand.ecc.calculate = denali_ecc_calculate;
denali->nand.ecc.correct = denali_ecc_correct;
denali->nand.ecc.hwctl = denali_ecc_hwctl;
--
1.9.1
--
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