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author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2016-09-16 18:33:09 (GMT) |
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committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2016-09-18 15:06:44 (GMT) |
commit | 6a3e4274e479a70069518679e45fe85ef3f30a36 (patch) | |
tree | 5f64d60420e70e74c8d364ef21ba7a634e47d02f /arch/arm/mach-uniphier/clk/pll-pro4.c | |
parent | 22de6b3374010bd5d9e3063f3b1fa4d70d10faee (diff) | |
download | u-boot-6a3e4274e479a70069518679e45fe85ef3f30a36.tar.xz |
ARM: uniphier: move PLL init code to U-Boot proper where possible
The PLL for the DRAM interface must be initialized in SPL, but the
others can be delayed until U-Boot proper. Move them from SPL to
U-Boot proper to save the precious SPL memory footprint.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/arm/mach-uniphier/clk/pll-pro4.c')
-rw-r--r-- | arch/arm/mach-uniphier/clk/pll-pro4.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/clk/pll-pro4.c b/arch/arm/mach-uniphier/clk/pll-pro4.c new file mode 100644 index 0000000..cdd1fd4 --- /dev/null +++ b/arch/arm/mach-uniphier/clk/pll-pro4.c @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2013-2014 Panasonic Corporation + * Copyright (C) 2015-2016 Socionext Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <linux/io.h> + +#include "../init.h" +#include "../sc-regs.h" +#include "../sg-regs.h" +#include "pll.h" + +static void vpll_init(void) +{ + u32 tmp, clk_mode_axosel; + + /* Set VPLL27A & VPLL27B */ + tmp = readl(SG_PINMON0); + clk_mode_axosel = tmp & SG_PINMON0_CLK_MODE_AXOSEL_MASK; + + /* 25MHz or 6.25MHz is default for Pro4R, no need to set VPLLA/B */ + if (clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ || + clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_6250KHZ) + return; + + /* Disable write protect of VPLL27ACTRL[2-7]*, VPLL27BCTRL[2-8] */ + tmp = readl(SC_VPLL27ACTRL); + tmp |= 0x00000001; + writel(tmp, SC_VPLL27ACTRL); + tmp = readl(SC_VPLL27BCTRL); + tmp |= 0x00000001; + writel(tmp, SC_VPLL27BCTRL); + + /* Unset VPLA_K_LD and VPLB_K_LD bit */ + tmp = readl(SC_VPLL27ACTRL3); + tmp &= ~0x10000000; + writel(tmp, SC_VPLL27ACTRL3); + tmp = readl(SC_VPLL27BCTRL3); + tmp &= ~0x10000000; + writel(tmp, SC_VPLL27BCTRL3); + + /* Set VPLA_M and VPLB_M to 0x20 */ + tmp = readl(SC_VPLL27ACTRL2); + tmp &= ~0x0000007f; + tmp |= 0x00000020; + writel(tmp, SC_VPLL27ACTRL2); + tmp = readl(SC_VPLL27BCTRL2); + tmp &= ~0x0000007f; + tmp |= 0x00000020; + writel(tmp, SC_VPLL27BCTRL2); + + if (clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ || + clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_6250KHZ) { + /* Set VPLA_K and VPLB_K for AXO: 25MHz */ + tmp = readl(SC_VPLL27ACTRL3); + tmp &= ~0x000fffff; + tmp |= 0x00066666; + writel(tmp, SC_VPLL27ACTRL3); + tmp = readl(SC_VPLL27BCTRL3); + tmp &= ~0x000fffff; + tmp |= 0x00066666; + writel(tmp, SC_VPLL27BCTRL3); + } else { + /* Set VPLA_K and VPLB_K for AXO: 24.576 MHz */ + tmp = readl(SC_VPLL27ACTRL3); + tmp &= ~0x000fffff; + tmp |= 0x000f5800; + writel(tmp, SC_VPLL27ACTRL3); + tmp = readl(SC_VPLL27BCTRL3); + tmp &= ~0x000fffff; + tmp |= 0x000f5800; + writel(tmp, SC_VPLL27BCTRL3); + } + + /* wait 1 usec */ + udelay(1); + + /* Set VPLA_K_LD and VPLB_K_LD to load K parameters */ + tmp = readl(SC_VPLL27ACTRL3); + tmp |= 0x10000000; + writel(tmp, SC_VPLL27ACTRL3); + tmp = readl(SC_VPLL27BCTRL3); + tmp |= 0x10000000; + writel(tmp, SC_VPLL27BCTRL3); + + /* Unset VPLA_SNRST and VPLB_SNRST bit */ + tmp = readl(SC_VPLL27ACTRL2); + tmp |= 0x10000000; + writel(tmp, SC_VPLL27ACTRL2); + tmp = readl(SC_VPLL27BCTRL2); + tmp |= 0x10000000; + writel(tmp, SC_VPLL27BCTRL2); + + /* Enable write protect of VPLL27ACTRL[2-7]*, VPLL27BCTRL[2-8] */ + tmp = readl(SC_VPLL27ACTRL); + tmp &= ~0x00000001; + writel(tmp, SC_VPLL27ACTRL); + tmp = readl(SC_VPLL27BCTRL); + tmp &= ~0x00000001; + writel(tmp, SC_VPLL27BCTRL); +} + +void uniphier_pro4_pll_init(void) +{ + vpll_init(); + uniphier_ld4_dpll_ssc_en(); +} |