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clk: imx: Add common API for masking MMDC handshake

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All i.MX6 SoCs need to mask unused MMDC channel's handshake
for low power modes, this patch provides common API for masking
the MMDC channel passed from caller.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Anson Huang 2019-05-12 10:24:12 +00:00 committed by Shawn Guo
parent 53c6a2ec01
commit efdb279033
2 changed files with 16 additions and 0 deletions
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15
drivers/clk/imx/clk.c
View File

@ -1,13 +1,28 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "clk.h"
#define CCM_CCDR 0x4
#define CCDR_MMDC_CH0_MASK BIT(17)
#define CCDR_MMDC_CH1_MASK BIT(16)
DEFINE_SPINLOCK(imx_ccm_lock);
void __init imx_mmdc_mask_handshake(void __iomem *ccm_base,
unsigned int chn)
{
unsigned int reg;
reg = readl_relaxed(ccm_base + CCM_CCDR);
reg |= chn == 0 ? CCDR_MMDC_CH0_MASK : CCDR_MMDC_CH1_MASK;
writel_relaxed(reg, ccm_base + CCM_CCDR);
}
void __init imx_check_clocks(struct clk *clks[], unsigned int count)
{
unsigned i;

1
drivers/clk/imx/clk.h
View File

@ -10,6 +10,7 @@ extern spinlock_t imx_ccm_lock;
void imx_check_clocks(struct clk *clks[], unsigned int count);
void imx_check_clk_hws(struct clk_hw *clks[], unsigned int count);
void imx_register_uart_clocks(struct clk ** const clks[]);
void imx_mmdc_mask_handshake(void __iomem *ccm_base, unsigned int chn);
extern void imx_cscmr1_fixup(u32 *val);