From 2acd089471d93373e051c6b1f9f9e0d9e51a76bc Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Thu, 21 Jun 2012 21:40:37 -0600 Subject: W1: OMAP HDQ1W: use 32-bit register accesses HDQ/1-wire registers are 32 bits long, even if the register contents fit into 8 bits, so accesses must be 32-bit aligned. Evidently the OMAP2/3 interconnects allowed the driver to get away with 8 bit accesses, but the OMAP4 puts a stop to that: [ 1.488800] Driver for 1-wire Dallas network protocol. [ 1.495025] Bad mode in data abort handler detected [ 1.500122] Internal error: Oops - bad mode: 0 [#1] SMP [ 1.505615] Modules linked in: [ 1.508819] CPU: 0 Not tainted (3.3.0-rc1-00008-g45030e9 #992) [ 1.515289] PC is at 0xffff0018 [ 1.518615] LR is at omap_hdq_probe+0xd4/0x2cc The OMAP4430 ES2 Rev X TRM does warn about this restriction in section 23.2.6.2 "HDQ/1-Wire Registers". Fixes the crash on OMAP4430 ES2 Pandaboard. Tested also on OMAP34xx and OMAP2420; it seems to work fine on those chips, although due to the lack of boards with HDQ/1-wire devices here, a more indepth test was not possible. Signed-off-by: Paul Walmsley Cc: NeilBrown Cc: Evgeniy Polyakov Acked-by: Evgeniy Polyakov --- drivers/w1/masters/omap_hdq.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/w1/masters/omap_hdq.c') diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c index 5ef385b..344db9c 100644 --- a/drivers/w1/masters/omap_hdq.c +++ b/drivers/w1/masters/omap_hdq.c @@ -102,20 +102,20 @@ static struct w1_bus_master omap_w1_master = { /* HDQ register I/O routines */ static inline u8 hdq_reg_in(struct hdq_data *hdq_data, u32 offset) { - return __raw_readb(hdq_data->hdq_base + offset); + return __raw_readl(hdq_data->hdq_base + offset); } static inline void hdq_reg_out(struct hdq_data *hdq_data, u32 offset, u8 val) { - __raw_writeb(val, hdq_data->hdq_base + offset); + __raw_writel(val, hdq_data->hdq_base + offset); } static inline u8 hdq_reg_merge(struct hdq_data *hdq_data, u32 offset, u8 val, u8 mask) { - u8 new_val = (__raw_readb(hdq_data->hdq_base + offset) & ~mask) + u8 new_val = (__raw_readl(hdq_data->hdq_base + offset) & ~mask) | (val & mask); - __raw_writeb(new_val, hdq_data->hdq_base + offset); + __raw_writel(new_val, hdq_data->hdq_base + offset); return new_val; } -- cgit v1.1