-----Original Message----- From: Valentin Longchamp [mailto:valentin.longchamp@keymile.com] Sent: 31 May 2012 14:14 To: Prafulla Wadaskar Cc: holger.brunck@keymile.com; u-boot@lists.denx.de Subject: Re: [PATCH v2 1/4] kirkwood: add kirkwood_mpp_read function
Hi Prafulla,
On 05/31/2012 10:30 AM, Prafulla Wadaskar wrote:
-----Original Message----- From: Valentin Longchamp [mailto:valentin.longchamp@keymile.com] Sent: 30 May 2012 21:12 To: Prafulla Wadaskar Cc: Valentin Longchamp; holger.brunck@keymile.com; u- boot@lists.denx.de; Prafulla Wadaskar Subject: [PATCH v2 1/4] kirkwood: add kirkwood_mpp_read function
This function can be used to save current mpp state of all mpp pins given in the mpp_list argument by reading the mpp registers, in the second mpp_saved argument.
A later call to kirkwood_mpp_conf function with this saved list
will
reset the mpp configuration as it was when kirkwood_mpp_read was called.
Signed-off-by: Valentin Longchamp valentin.longchamp@keymile.com cc: Holger Brunck holger.brunck@keymile.com cc: Prafulla Wadaskar prafulla@marvell.com
arch/arm/cpu/arm926ejs/kirkwood/mpp.c | 41 ++++++++++++++++++++++++++++++ arch/arm/include/asm/arch-kirkwood/mpp.h | 1 + 2 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/kirkwood/mpp.c b/arch/arm/cpu/arm926ejs/kirkwood/mpp.c index 3da6c98..9fb9aea 100644 --- a/arch/arm/cpu/arm926ejs/kirkwood/mpp.c +++ b/arch/arm/cpu/arm926ejs/kirkwood/mpp.c @@ -80,3 +80,44 @@ void kirkwood_mpp_conf(u32 *mpp_list) debug("\n");
}
+void kirkwood_mpp_read(u32 *mpp_list, u32 *mpp_saved) +{
- u32 mpp_ctrl[MPP_NR_REGS];
- unsigned int variant_mask;
- int i;
- variant_mask = kirkwood_variant();
- if (!variant_mask)
return;- for (i = 0; i < MPP_NR_REGS; i++) {
mpp_ctrl[i] = readl(MPP_CTRL(i));debug(" %08x", mpp_ctrl[i]);- }
- while (*mpp_list) {
unsigned int num = MPP_NUM(*mpp_list);unsigned int sel;int shift;if (num > MPP_MAX) {debug("kirkwood_mpp_conf: invalid MPP ""number (%u)\n", num);
continue;
}if (!(*mpp_list & variant_mask)) {debug("kirkwood_mpp_conf: requested MPP%u config ""unavailable on this hardware\n", num);continue;}shift = (num & 7) << 2;sel = (mpp_ctrl[num / 8] >> shift) & 0xf;*mpp_saved = num | (sel << 8) | variant_mask;mpp_list++;mpp_saved++;- }
+}
Hi Valentin There is code duplication, similar code it already there in function
kirkwood_mpp_conf(), to make it short you should use kirkwood_mpp_read function within kirkwood_mpp_conf
Not sure I understand what you mean. You want me to implement the kirkwood_mpp_read functionnality directly into kirkwood_mpp_conf ?
Yes,
If this is so, it would mean that I would have to change kirkwood_mpp_conf "API" to add the second argument (mpp_saved) and then I would have to fix all the calls to this function. Is that what you mean ?
Yes, my objective here is - how good we can optimise the code.
I will not stretch it further, it's up to you.
Regards.. Prafulla . . .