yair/u-boot-tk1-som
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ARM: sun6i: Add support for the power reset control module found on the A31

Browse Source 
The A31 has a new module called PRCM, or Power, Reset Control Module.
This module controls clocks and resets for RTC block modules, and also
PLL biasing in the main clock module.

This patch adds the register definitions, and also enables the clocks
and resets for the RTC block PIO (pin controller) and P2WI (push-pull
2 wire interface) which is used to talk to the PMIC.

Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[wens@csie.org: spacing fixes reported by checkpatch.pl]
[wens@csie.org: Use setbits helper in PRCM init function]
[wens@csie.org: rephrase commit message to explain what the hardware
		supports and what we actually enable]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
This commit is contained in:
Oliver Schinagl
2014-10-03 20:16:24 +08:00
committed by Hans de Goede
parent 93ce1e9dad
commit 174deb768c
3 changed files with 272 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/cpu/armv7/sunxi/Makefile
View File

@@ -11,6 +11,7 @@ obj-y += timer.o
obj-y += board.o
obj-y += clock.o
obj-y += pinmux.o
obj-$(CONFIG_SUN6I) += prcm.o
obj-$(CONFIG_SUN4I) += clock_sun4i.o
obj-$(CONFIG_SUN5I) += clock_sun4i.o
obj-$(CONFIG_SUN7I) += clock_sun4i.o

33
arch/arm/cpu/armv7/sunxi/prcm.c Normal file
View File

@@ -0,0 +1,33 @@
/*
* Sunxi A31 Power Management Unit
*
* (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
* http://linux-sunxi.org
*
* Based on sun6i sources and earlier U-Boot Allwinner A10 SPL work
*
* (C) Copyright 2006-2013
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Berg Xing <bergxing@allwinnertech.com>
* Tom Cubie <tangliang@allwinnertech.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/prcm.h>
#include <asm/arch/sys_proto.h>
void prcm_init_apb0(void)
{
struct sunxi_prcm_reg *prcm =
(struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
setbits_le32(&prcm->apb0_gate, PRCM_APB0_GATE_P2WI |
PRCM_APB0_GATE_PIO);
setbits_le32(&prcm->apb0_reset, PRCM_APB0_RESET_P2WI |
PRCM_APB0_RESET_PIO);
}