mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
mtd: nand: pxa3xx: Support command buffer #3
Some newer controllers support a fourth command buffer. This additional command buffer allows to set an arbitrary length count, using the NDCB3.NDLENCNT field, to perform non-standard length operations such as the ONFI parameter page read. Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Tested-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
parent
5bb653e890
commit
3a1a344a79
1 changed files with 15 additions and 0 deletions
|
@ -197,6 +197,7 @@ struct pxa3xx_nand_info {
|
|||
uint32_t ndcb0;
|
||||
uint32_t ndcb1;
|
||||
uint32_t ndcb2;
|
||||
uint32_t ndcb3;
|
||||
};
|
||||
|
||||
static bool use_dma = 1;
|
||||
|
@ -493,9 +494,22 @@ static irqreturn_t pxa3xx_nand_irq(int irq, void *devid)
|
|||
nand_writel(info, NDSR, NDSR_WRCMDREQ);
|
||||
status &= ~NDSR_WRCMDREQ;
|
||||
info->state = STATE_CMD_HANDLE;
|
||||
|
||||
/*
|
||||
* Command buffer registers NDCB{0-2} (and optionally NDCB3)
|
||||
* must be loaded by writing directly either 12 or 16
|
||||
* bytes directly to NDCB0, four bytes at a time.
|
||||
*
|
||||
* Direct write access to NDCB1, NDCB2 and NDCB3 is ignored
|
||||
* but each NDCBx register can be read.
|
||||
*/
|
||||
nand_writel(info, NDCB0, info->ndcb0);
|
||||
nand_writel(info, NDCB0, info->ndcb1);
|
||||
nand_writel(info, NDCB0, info->ndcb2);
|
||||
|
||||
/* NDCB3 register is available in NFCv2 (Armada 370/XP SoC) */
|
||||
if (info->variant == PXA3XX_NAND_VARIANT_ARMADA370)
|
||||
nand_writel(info, NDCB0, info->ndcb3);
|
||||
}
|
||||
|
||||
/* clear NDSR to let the controller exit the IRQ */
|
||||
|
@ -554,6 +568,7 @@ static int prepare_command_pool(struct pxa3xx_nand_info *info, int command,
|
|||
default:
|
||||
info->ndcb1 = 0;
|
||||
info->ndcb2 = 0;
|
||||
info->ndcb3 = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in a new issue