From cbe7fc8aaeefc71a75c2688602ba5bb570c0a265 Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Thu, 4 Jul 2013 17:22:26 +0800 Subject: ARM: imx: add common clock support for fixup div One register may have several fields to control some clocks. It is possible that the read/write values of some fields may map to different real functional values, so writing to the other fields in the same register may break a working clock tree. A real case is the aclk_podf field in the register 'CCM Serial Clock Multiplexer Register 1' of i.MX6Q/SDL SoC. This patch introduces a fixup hook for divider clock which is called before writing a value to clock registers to support this kind of divider clocks. Signed-off-by: Liu Ying Signed-off-by: Shawn Guo --- arch/arm/mach-imx/clk.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/arm/mach-imx/clk.h') diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h index 0e4e8bb261b9..51eb38538cc4 100644 --- a/arch/arm/mach-imx/clk.h +++ b/arch/arm/mach-imx/clk.h @@ -49,6 +49,10 @@ struct clk *imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift, u8 width, void __iomem *busy_reg, u8 busy_shift, const char **parent_names, int num_parents); +struct clk *imx_clk_fixup_divider(const char *name, const char *parent, + void __iomem *reg, u8 shift, u8 width, + void (*fixup)(u32 *val)); + static inline struct clk *imx_clk_fixed(const char *name, int rate) { return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate); -- cgit v1.2.3 From a49e6c4b820488b79ada6da9ce609fa8611d3e00 Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Thu, 4 Jul 2013 17:35:46 +0800 Subject: ARM: imx: add common clock support for fixup mux One register may have several fields to control some clocks. It is possible that the read/write values of some fields may map to different real functional values, so writing to the other fields in the same register may break a working clock tree. A real case is the aclk_podf field in the register 'CCM Serial Clock Multiplexer Register 1' of i.MX6Q/SDL SoC. This patch introduces a fixup hook for multiplexer clock which is called before writing a value to clock registers to support this kind of multiplexer clocks. Signed-off-by: Liu Ying Signed-off-by: Shawn Guo --- arch/arm/mach-imx/Makefile | 2 +- arch/arm/mach-imx/clk-fixup-mux.c | 107 ++++++++++++++++++++++++++++++++++++++ arch/arm/mach-imx/clk.h | 4 ++ 3 files changed, 112 insertions(+), 1 deletion(-) create mode 100644 arch/arm/mach-imx/clk-fixup-mux.c (limited to 'arch/arm/mach-imx/clk.h') diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile index 92b91a22eb4d..5383c589ad71 100644 --- a/arch/arm/mach-imx/Makefile +++ b/arch/arm/mach-imx/Makefile @@ -16,7 +16,7 @@ obj-$(CONFIG_SOC_IMX5) += cpu-imx5.o mm-imx5.o clk-imx51-imx53.o ehci-imx5.o $(i obj-$(CONFIG_COMMON_CLK) += clk-pllv1.o clk-pllv2.o clk-pllv3.o clk-gate2.o \ clk-pfd.o clk-busy.o clk.o \ - clk-fixup-div.o + clk-fixup-div.o clk-fixup-mux.o obj-$(CONFIG_IMX_HAVE_IOMUX_V1) += iomux-v1.o obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o diff --git a/arch/arm/mach-imx/clk-fixup-mux.c b/arch/arm/mach-imx/clk-fixup-mux.c new file mode 100644 index 000000000000..deb4b8093b30 --- /dev/null +++ b/arch/arm/mach-imx/clk-fixup-mux.c @@ -0,0 +1,107 @@ +/* + * Copyright (C) 2013 Freescale Semiconductor, Inc. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include +#include +#include +#include +#include "clk.h" + +#define to_clk_mux(_hw) container_of(_hw, struct clk_mux, hw) + +/** + * struct clk_fixup_mux - imx integer fixup multiplexer clock + * @mux: the parent class + * @ops: pointer to clk_ops of parent class + * @fixup: a hook to fixup the write value + * + * The imx fixup multiplexer clock is a subclass of basic clk_mux + * with an addtional fixup hook. + */ +struct clk_fixup_mux { + struct clk_mux mux; + const struct clk_ops *ops; + void (*fixup)(u32 *val); +}; + +static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw) +{ + struct clk_mux *mux = to_clk_mux(hw); + + return container_of(mux, struct clk_fixup_mux, mux); +} + +static u8 clk_fixup_mux_get_parent(struct clk_hw *hw) +{ + struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); + + return fixup_mux->ops->get_parent(&fixup_mux->mux.hw); +} + +static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); + struct clk_mux *mux = to_clk_mux(hw); + unsigned long flags = 0; + u32 val; + + spin_lock_irqsave(mux->lock, flags); + + val = readl(mux->reg); + val &= ~(mux->mask << mux->shift); + val |= index << mux->shift; + fixup_mux->fixup(&val); + writel(val, mux->reg); + + spin_unlock_irqrestore(mux->lock, flags); + + return 0; +} + +static const struct clk_ops clk_fixup_mux_ops = { + .get_parent = clk_fixup_mux_get_parent, + .set_parent = clk_fixup_mux_set_parent, +}; + +struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg, + u8 shift, u8 width, const char **parents, + int num_parents, void (*fixup)(u32 *val)) +{ + struct clk_fixup_mux *fixup_mux; + struct clk *clk; + struct clk_init_data init; + + if (!fixup) + return ERR_PTR(-EINVAL); + + fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL); + if (!fixup_mux) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &clk_fixup_mux_ops; + init.parent_names = parents; + init.num_parents = num_parents; + + fixup_mux->mux.reg = reg; + fixup_mux->mux.shift = shift; + fixup_mux->mux.mask = BIT(width) - 1; + fixup_mux->mux.lock = &imx_ccm_lock; + fixup_mux->mux.hw.init = &init; + fixup_mux->ops = &clk_mux_ops; + fixup_mux->fixup = fixup; + + clk = clk_register(NULL, &fixup_mux->mux.hw); + if (IS_ERR(clk)) + kfree(fixup_mux); + + return clk; +} diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h index 51eb38538cc4..2534359fdedc 100644 --- a/arch/arm/mach-imx/clk.h +++ b/arch/arm/mach-imx/clk.h @@ -53,6 +53,10 @@ struct clk *imx_clk_fixup_divider(const char *name, const char *parent, void __iomem *reg, u8 shift, u8 width, void (*fixup)(u32 *val)); +struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg, + u8 shift, u8 width, const char **parents, + int num_parents, void (*fixup)(u32 *val)); + static inline struct clk *imx_clk_fixed(const char *name, int rate) { return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate); -- cgit v1.2.3 From dfd871442e37d8563d2fe16fe65e6507fd3071fa Mon Sep 17 00:00:00 2001 From: Liu Ying Date: Thu, 4 Jul 2013 17:57:17 +0800 Subject: ARM: imx6: change some clocks to fixup clocks All the clocks controlled by the register 'CCM Serial Clock Multiplexer Register 1' should be fixup clocks. This patch changes those clocks from basic multiplexer or divider clocks to fixup clocks. Signed-off-by: Liu Ying Signed-off-by: Shawn Guo --- arch/arm/mach-imx/clk-imx6q.c | 24 ++++++++++++------------ arch/arm/mach-imx/clk-imx6sl.c | 20 ++++++++++---------- arch/arm/mach-imx/clk.c | 26 ++++++++++++++++++++++++++ arch/arm/mach-imx/clk.h | 2 ++ 4 files changed, 50 insertions(+), 22 deletions(-) (limited to 'arch/arm/mach-imx/clk.h') diff --git a/arch/arm/mach-imx/clk-imx6q.c b/arch/arm/mach-imx/clk-imx6q.c index 82a85cea7ce0..db9f8f5646f1 100644 --- a/arch/arm/mach-imx/clk-imx6q.c +++ b/arch/arm/mach-imx/clk-imx6q.c @@ -384,16 +384,16 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node) clk[ipu2_di1_sel] = imx_clk_mux("ipu2_di1_sel", base + 0x38, 9, 3, ipu2_di1_sels, ARRAY_SIZE(ipu2_di1_sels)); clk[hsi_tx_sel] = imx_clk_mux("hsi_tx_sel", base + 0x30, 28, 1, hsi_tx_sels, ARRAY_SIZE(hsi_tx_sels)); clk[pcie_axi_sel] = imx_clk_mux("pcie_axi_sel", base + 0x18, 10, 1, pcie_axi_sels, ARRAY_SIZE(pcie_axi_sels)); - clk[ssi1_sel] = imx_clk_mux("ssi1_sel", base + 0x1c, 10, 2, ssi_sels, ARRAY_SIZE(ssi_sels)); - clk[ssi2_sel] = imx_clk_mux("ssi2_sel", base + 0x1c, 12, 2, ssi_sels, ARRAY_SIZE(ssi_sels)); - clk[ssi3_sel] = imx_clk_mux("ssi3_sel", base + 0x1c, 14, 2, ssi_sels, ARRAY_SIZE(ssi_sels)); - clk[usdhc1_sel] = imx_clk_mux("usdhc1_sel", base + 0x1c, 16, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clk[usdhc2_sel] = imx_clk_mux("usdhc2_sel", base + 0x1c, 17, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clk[usdhc3_sel] = imx_clk_mux("usdhc3_sel", base + 0x1c, 18, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clk[usdhc4_sel] = imx_clk_mux("usdhc4_sel", base + 0x1c, 19, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); + clk[ssi1_sel] = imx_clk_fixup_mux("ssi1_sel", base + 0x1c, 10, 2, ssi_sels, ARRAY_SIZE(ssi_sels), imx_cscmr1_fixup); + clk[ssi2_sel] = imx_clk_fixup_mux("ssi2_sel", base + 0x1c, 12, 2, ssi_sels, ARRAY_SIZE(ssi_sels), imx_cscmr1_fixup); + clk[ssi3_sel] = imx_clk_fixup_mux("ssi3_sel", base + 0x1c, 14, 2, ssi_sels, ARRAY_SIZE(ssi_sels), imx_cscmr1_fixup); + clk[usdhc1_sel] = imx_clk_fixup_mux("usdhc1_sel", base + 0x1c, 16, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clk[usdhc2_sel] = imx_clk_fixup_mux("usdhc2_sel", base + 0x1c, 17, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clk[usdhc3_sel] = imx_clk_fixup_mux("usdhc3_sel", base + 0x1c, 18, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clk[usdhc4_sel] = imx_clk_fixup_mux("usdhc4_sel", base + 0x1c, 19, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); clk[enfc_sel] = imx_clk_mux("enfc_sel", base + 0x2c, 16, 2, enfc_sels, ARRAY_SIZE(enfc_sels)); - clk[emi_sel] = imx_clk_mux("emi_sel", base + 0x1c, 27, 2, emi_sels, ARRAY_SIZE(emi_sels)); - clk[emi_slow_sel] = imx_clk_mux("emi_slow_sel", base + 0x1c, 29, 2, emi_slow_sels, ARRAY_SIZE(emi_slow_sels)); + clk[emi_sel] = imx_clk_fixup_mux("emi_sel", base + 0x1c, 27, 2, emi_sels, ARRAY_SIZE(emi_sels), imx_cscmr1_fixup); + clk[emi_slow_sel] = imx_clk_fixup_mux("emi_slow_sel", base + 0x1c, 29, 2, emi_slow_sels, ARRAY_SIZE(emi_slow_sels), imx_cscmr1_fixup); clk[vdo_axi_sel] = imx_clk_mux("vdo_axi_sel", base + 0x18, 11, 1, vdo_axi_sels, ARRAY_SIZE(vdo_axi_sels)); clk[vpu_axi_sel] = imx_clk_mux("vpu_axi_sel", base + 0x18, 14, 2, vpu_axi_sels, ARRAY_SIZE(vpu_axi_sels)); clk[cko1_sel] = imx_clk_mux("cko1_sel", base + 0x60, 0, 4, cko1_sels, ARRAY_SIZE(cko1_sels)); @@ -406,7 +406,7 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node) clk[periph_clk2] = imx_clk_divider("periph_clk2", "periph_clk2_sel", base + 0x14, 27, 3); clk[periph2_clk2] = imx_clk_divider("periph2_clk2", "periph2_clk2_sel", base + 0x14, 0, 3); clk[ipg] = imx_clk_divider("ipg", "ahb", base + 0x14, 8, 2); - clk[ipg_per] = imx_clk_divider("ipg_per", "ipg", base + 0x1c, 0, 6); + clk[ipg_per] = imx_clk_fixup_divider("ipg_per", "ipg", base + 0x1c, 0, 6, imx_cscmr1_fixup); clk[esai_pred] = imx_clk_divider("esai_pred", "esai_sel", base + 0x28, 9, 3); clk[esai_podf] = imx_clk_divider("esai_podf", "esai_pred", base + 0x28, 25, 3); clk[asrc_pred] = imx_clk_divider("asrc_pred", "asrc_sel", base + 0x30, 12, 3); @@ -442,8 +442,8 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node) clk[usdhc4_podf] = imx_clk_divider("usdhc4_podf", "usdhc4_sel", base + 0x24, 22, 3); clk[enfc_pred] = imx_clk_divider("enfc_pred", "enfc_sel", base + 0x2c, 18, 3); clk[enfc_podf] = imx_clk_divider("enfc_podf", "enfc_pred", base + 0x2c, 21, 6); - clk[emi_podf] = imx_clk_divider("emi_podf", "emi_sel", base + 0x1c, 20, 3); - clk[emi_slow_podf] = imx_clk_divider("emi_slow_podf", "emi_slow_sel", base + 0x1c, 23, 3); + clk[emi_podf] = imx_clk_fixup_divider("emi_podf", "emi_sel", base + 0x1c, 20, 3, imx_cscmr1_fixup); + clk[emi_slow_podf] = imx_clk_fixup_divider("emi_slow_podf", "emi_slow_sel", base + 0x1c, 23, 3, imx_cscmr1_fixup); clk[vpu_axi_podf] = imx_clk_divider("vpu_axi_podf", "vpu_axi_sel", base + 0x24, 25, 3); clk[cko1_podf] = imx_clk_divider("cko1_podf", "cko1_sel", base + 0x60, 4, 3); diff --git a/arch/arm/mach-imx/clk-imx6sl.c b/arch/arm/mach-imx/clk-imx6sl.c index a307ac22dffe..a5c3c5d21aee 100644 --- a/arch/arm/mach-imx/clk-imx6sl.c +++ b/arch/arm/mach-imx/clk-imx6sl.c @@ -138,14 +138,14 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node) clks[IMX6SL_CLK_PERIPH_CLK2_SEL] = imx_clk_mux("periph_clk2_sel", base + 0x18, 12, 2, periph_clk2_sels, ARRAY_SIZE(periph_clk2_sels)); clks[IMX6SL_CLK_CSI_SEL] = imx_clk_mux("csi_sel", base + 0x3c, 9, 2, csi_lcdif_sels, ARRAY_SIZE(csi_lcdif_sels)); clks[IMX6SL_CLK_LCDIF_AXI_SEL] = imx_clk_mux("lcdif_axi_sel", base + 0x3c, 14, 2, csi_lcdif_sels, ARRAY_SIZE(csi_lcdif_sels)); - clks[IMX6SL_CLK_USDHC1_SEL] = imx_clk_mux("usdhc1_sel", base + 0x1c, 16, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clks[IMX6SL_CLK_USDHC2_SEL] = imx_clk_mux("usdhc2_sel", base + 0x1c, 17, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clks[IMX6SL_CLK_USDHC3_SEL] = imx_clk_mux("usdhc3_sel", base + 0x1c, 18, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clks[IMX6SL_CLK_USDHC4_SEL] = imx_clk_mux("usdhc4_sel", base + 0x1c, 19, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels)); - clks[IMX6SL_CLK_SSI1_SEL] = imx_clk_mux("ssi1_sel", base + 0x1c, 10, 2, ssi_sels, ARRAY_SIZE(ssi_sels)); - clks[IMX6SL_CLK_SSI2_SEL] = imx_clk_mux("ssi2_sel", base + 0x1c, 12, 2, ssi_sels, ARRAY_SIZE(ssi_sels)); - clks[IMX6SL_CLK_SSI3_SEL] = imx_clk_mux("ssi3_sel", base + 0x1c, 14, 2, ssi_sels, ARRAY_SIZE(ssi_sels)); - clks[IMX6SL_CLK_PERCLK_SEL] = imx_clk_mux("perclk_sel", base + 0x1c, 6, 1, perclk_sels, ARRAY_SIZE(perclk_sels)); + clks[IMX6SL_CLK_USDHC1_SEL] = imx_clk_fixup_mux("usdhc1_sel", base + 0x1c, 16, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_USDHC2_SEL] = imx_clk_fixup_mux("usdhc2_sel", base + 0x1c, 17, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_USDHC3_SEL] = imx_clk_fixup_mux("usdhc3_sel", base + 0x1c, 18, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_USDHC4_SEL] = imx_clk_fixup_mux("usdhc4_sel", base + 0x1c, 19, 1, usdhc_sels, ARRAY_SIZE(usdhc_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_SSI1_SEL] = imx_clk_fixup_mux("ssi1_sel", base + 0x1c, 10, 2, ssi_sels, ARRAY_SIZE(ssi_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_SSI2_SEL] = imx_clk_fixup_mux("ssi2_sel", base + 0x1c, 12, 2, ssi_sels, ARRAY_SIZE(ssi_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_SSI3_SEL] = imx_clk_fixup_mux("ssi3_sel", base + 0x1c, 14, 2, ssi_sels, ARRAY_SIZE(ssi_sels), imx_cscmr1_fixup); + clks[IMX6SL_CLK_PERCLK_SEL] = imx_clk_fixup_mux("perclk_sel", base + 0x1c, 6, 1, perclk_sels, ARRAY_SIZE(perclk_sels), imx_cscmr1_fixup); clks[IMX6SL_CLK_PXP_AXI_SEL] = imx_clk_mux("pxp_axi_sel", base + 0x34, 6, 3, epdc_pxp_sels, ARRAY_SIZE(epdc_pxp_sels)); clks[IMX6SL_CLK_EPDC_AXI_SEL] = imx_clk_mux("epdc_axi_sel", base + 0x34, 15, 3, epdc_pxp_sels, ARRAY_SIZE(epdc_pxp_sels)); clks[IMX6SL_CLK_GPU2D_OVG_SEL] = imx_clk_mux("gpu2d_ovg_sel", base + 0x18, 4, 2, gpu2d_ovg_sels, ARRAY_SIZE(gpu2d_ovg_sels)); @@ -179,14 +179,14 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node) clks[IMX6SL_CLK_SSI2_PODF] = imx_clk_divider("ssi2_podf", "ssi2_pred", base + 0x2c, 0, 6); clks[IMX6SL_CLK_SSI3_PRED] = imx_clk_divider("ssi3_pred", "ssi3_sel", base + 0x28, 22, 3); clks[IMX6SL_CLK_SSI3_PODF] = imx_clk_divider("ssi3_podf", "ssi3_pred", base + 0x28, 16, 6); - clks[IMX6SL_CLK_PERCLK] = imx_clk_divider("perclk", "perclk_sel", base + 0x1c, 0, 6); + clks[IMX6SL_CLK_PERCLK] = imx_clk_fixup_divider("perclk", "perclk_sel", base + 0x1c, 0, 6, imx_cscmr1_fixup); clks[IMX6SL_CLK_PXP_AXI_PODF] = imx_clk_divider("pxp_axi_podf", "pxp_axi_sel", base + 0x34, 3, 3); clks[IMX6SL_CLK_EPDC_AXI_PODF] = imx_clk_divider("epdc_axi_podf", "epdc_axi_sel", base + 0x34, 12, 3); clks[IMX6SL_CLK_GPU2D_OVG_PODF] = imx_clk_divider("gpu2d_ovg_podf", "gpu2d_ovg_sel", base + 0x18, 26, 3); clks[IMX6SL_CLK_GPU2D_PODF] = imx_clk_divider("gpu2d_podf", "gpu2d_sel", base + 0x18, 29, 3); clks[IMX6SL_CLK_LCDIF_PIX_PRED] = imx_clk_divider("lcdif_pix_pred", "lcdif_pix_sel", base + 0x38, 3, 3); clks[IMX6SL_CLK_EPDC_PIX_PRED] = imx_clk_divider("epdc_pix_pred", "epdc_pix_sel", base + 0x38, 12, 3); - clks[IMX6SL_CLK_LCDIF_PIX_PODF] = imx_clk_divider("lcdif_pix_podf", "lcdif_pix_pred", base + 0x1c, 20, 3); + clks[IMX6SL_CLK_LCDIF_PIX_PODF] = imx_clk_fixup_divider("lcdif_pix_podf", "lcdif_pix_pred", base + 0x1c, 20, 3, imx_cscmr1_fixup); clks[IMX6SL_CLK_EPDC_PIX_PODF] = imx_clk_divider("epdc_pix_podf", "epdc_pix_pred", base + 0x18, 23, 3); clks[IMX6SL_CLK_SPDIF0_PRED] = imx_clk_divider("spdif0_pred", "spdif0_sel", base + 0x30, 25, 3); clks[IMX6SL_CLK_SPDIF0_PODF] = imx_clk_divider("spdif0_podf", "spdif0_pred", base + 0x30, 22, 3); diff --git a/arch/arm/mach-imx/clk.c b/arch/arm/mach-imx/clk.c index 55bc80a00666..edc35df7bed4 100644 --- a/arch/arm/mach-imx/clk.c +++ b/arch/arm/mach-imx/clk.c @@ -37,3 +37,29 @@ struct clk * __init imx_obtain_fixed_clock( clk = imx_clk_fixed(name, rate); return clk; } + +/* + * This fixups the register CCM_CSCMR1 write value. + * The write/read/divider values of the aclk_podf field + * of that register have the relationship described by + * the following table: + * + * write value read value divider + * 3b'000 3b'110 7 + * 3b'001 3b'111 8 + * 3b'010 3b'100 5 + * 3b'011 3b'101 6 + * 3b'100 3b'010 3 + * 3b'101 3b'011 4 + * 3b'110 3b'000 1 + * 3b'111 3b'001 2(default) + * + * That's why we do the xor operation below. + */ +#define CSCMR1_FIXUP 0x00600000 + +void imx_cscmr1_fixup(u32 *val) +{ + *val ^= CSCMR1_FIXUP; + return; +} diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h index 2534359fdedc..3451f1f8ba1f 100644 --- a/arch/arm/mach-imx/clk.h +++ b/arch/arm/mach-imx/clk.h @@ -6,6 +6,8 @@ extern spinlock_t imx_ccm_lock; +extern void imx_cscmr1_fixup(u32 *val); + struct clk *imx_clk_pllv1(const char *name, const char *parent, void __iomem *base); -- cgit v1.2.3