From efdb279033ad4fa830e330a071d1e434235aa153 Mon Sep 17 00:00:00 2001 From: Anson Huang Date: Sun, 12 May 2019 10:24:12 +0000 Subject: clk: imx: Add common API for masking MMDC handshake 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 Reviewed-by: Dong Aisheng Signed-off-by: Shawn Guo --- drivers/clk/imx/clk.c | 15 +++++++++++++++ drivers/clk/imx/clk.h | 1 + 2 files changed, 16 insertions(+) (limited to 'drivers') diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c index 1efed86217f7..9cd709787ea6 100644 --- a/drivers/clk/imx/clk.c +++ b/drivers/clk/imx/clk.c @@ -1,13 +1,28 @@ // SPDX-License-Identifier: GPL-2.0 #include #include +#include #include #include #include #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; diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h index 8639a8f2153e..6dcdc91cbba8 100644 --- a/drivers/clk/imx/clk.h +++ b/drivers/clk/imx/clk.h @@ -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); -- cgit v1.2.3