mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 10:39:04 +00:00
60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From 64ad46379fcf14f437553f654d1adcd3d0e0d7f9 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
|
|
Date: Mon, 15 Aug 2016 14:21:28 +0200
|
|
Subject: [PATCH] mtd: bcm47xxsflash: use uncached MMIO access for BCM53573
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
BCM53573 is a new series of Broadcom's SoCs. It's based on ARM and uses
|
|
this old ChipCommon-based flash access. Early tests resulted in flash
|
|
corruptions that were tracked down to using cached MMIO for flash read
|
|
access. Switch to ioremap_nocache conditionally to support BCM53573 and
|
|
don't break performance on old MIPS devices.
|
|
|
|
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
|
|
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
|
|
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
|
|
---
|
|
drivers/mtd/devices/bcm47xxsflash.c | 24 +++++++++++++++++++-----
|
|
1 file changed, 19 insertions(+), 5 deletions(-)
|
|
|
|
--- a/drivers/mtd/devices/bcm47xxsflash.c
|
|
+++ b/drivers/mtd/devices/bcm47xxsflash.c
|
|
@@ -296,16 +296,30 @@ static int bcm47xxsflash_bcma_probe(stru
|
|
dev_err(dev, "can't request region for resource %pR\n", res);
|
|
return -EBUSY;
|
|
}
|
|
- b47s->window = ioremap_cache(res->start, resource_size(res));
|
|
- if (!b47s->window) {
|
|
- dev_err(dev, "ioremap failed for resource %pR\n", res);
|
|
- return -ENOMEM;
|
|
- }
|
|
|
|
b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);
|
|
b47s->cc_read = bcm47xxsflash_bcma_cc_read;
|
|
b47s->cc_write = bcm47xxsflash_bcma_cc_write;
|
|
|
|
+ /*
|
|
+ * On old MIPS devices cache was magically invalidated when needed,
|
|
+ * allowing us to use cached access and gain some performance. Trying
|
|
+ * the same on ARM based BCM53573 results in flash corruptions, we need
|
|
+ * to use uncached access for it.
|
|
+ *
|
|
+ * It may be arch specific, but right now there is only 1 ARM SoC using
|
|
+ * this driver, so let's follow Broadcom's reference code and check
|
|
+ * ChipCommon revision.
|
|
+ */
|
|
+ if (b47s->bcma_cc->core->id.rev == 54)
|
|
+ b47s->window = ioremap_nocache(res->start, resource_size(res));
|
|
+ else
|
|
+ b47s->window = ioremap_cache(res->start, resource_size(res));
|
|
+ if (!b47s->window) {
|
|
+ dev_err(dev, "ioremap failed for resource %pR\n", res);
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) {
|
|
case BCMA_CC_FLASHT_STSER:
|
|
b47s->type = BCM47XXSFLASH_TYPE_ST;
|