forked from Minki/linux
5e1a63f5f5
This commit activates the SSCG deviation correction for the Armada 370. It uses the optional function introduced by the commit "clk: mvebu: Fix clk frequency value if SSCG is enabled". Without this fix the deviation measured on a Mirabox was of a few second each hour, whereas with this fix it was reduced at around 50ppm (around 4s per day). Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Leigh Brown <leigh@solinno.co.uk> Link: https://lkml.kernel.org/r/1409645719-20003-3-git-send-email-gregory.clement@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
184 lines
4.7 KiB
C
184 lines
4.7 KiB
C
/*
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* Marvell Armada 370 SoC clocks
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*
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* Copyright (C) 2012 Marvell
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*
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* Gregory CLEMENT <gregory.clement@free-electrons.com>
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* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
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* Andrew Lunn <andrew@lunn.ch>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include "common.h"
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/*
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* Core Clocks
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*/
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#define SARL 0 /* Low part [0:31] */
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#define SARL_A370_SSCG_ENABLE BIT(10)
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#define SARL_A370_PCLK_FREQ_OPT 11
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#define SARL_A370_PCLK_FREQ_OPT_MASK 0xF
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#define SARL_A370_FAB_FREQ_OPT 15
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#define SARL_A370_FAB_FREQ_OPT_MASK 0x1F
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#define SARL_A370_TCLK_FREQ_OPT 20
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#define SARL_A370_TCLK_FREQ_OPT_MASK 0x1
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enum { A370_CPU_TO_NBCLK, A370_CPU_TO_HCLK, A370_CPU_TO_DRAMCLK };
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static const struct coreclk_ratio a370_coreclk_ratios[] __initconst = {
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{ .id = A370_CPU_TO_NBCLK, .name = "nbclk" },
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{ .id = A370_CPU_TO_HCLK, .name = "hclk" },
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{ .id = A370_CPU_TO_DRAMCLK, .name = "dramclk" },
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};
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static const u32 a370_tclk_freqs[] __initconst = {
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166000000,
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200000000,
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};
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static u32 __init a370_get_tclk_freq(void __iomem *sar)
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{
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u8 tclk_freq_select = 0;
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tclk_freq_select = ((readl(sar) >> SARL_A370_TCLK_FREQ_OPT) &
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SARL_A370_TCLK_FREQ_OPT_MASK);
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return a370_tclk_freqs[tclk_freq_select];
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}
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static const u32 a370_cpu_freqs[] __initconst = {
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400000000,
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533000000,
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667000000,
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800000000,
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1000000000,
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1067000000,
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1200000000,
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};
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static u32 __init a370_get_cpu_freq(void __iomem *sar)
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{
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u32 cpu_freq;
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u8 cpu_freq_select = 0;
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cpu_freq_select = ((readl(sar) >> SARL_A370_PCLK_FREQ_OPT) &
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SARL_A370_PCLK_FREQ_OPT_MASK);
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if (cpu_freq_select >= ARRAY_SIZE(a370_cpu_freqs)) {
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pr_err("CPU freq select unsupported %d\n", cpu_freq_select);
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cpu_freq = 0;
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} else
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cpu_freq = a370_cpu_freqs[cpu_freq_select];
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return cpu_freq;
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}
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static const int a370_nbclk_ratios[32][2] __initconst = {
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{0, 1}, {1, 2}, {2, 2}, {2, 2},
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{1, 2}, {1, 2}, {1, 1}, {2, 3},
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{0, 1}, {1, 2}, {2, 4}, {0, 1},
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{1, 2}, {0, 1}, {0, 1}, {2, 2},
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{0, 1}, {0, 1}, {0, 1}, {1, 1},
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{2, 3}, {0, 1}, {0, 1}, {0, 1},
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{0, 1}, {0, 1}, {0, 1}, {1, 1},
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{0, 1}, {0, 1}, {0, 1}, {0, 1},
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};
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static const int a370_hclk_ratios[32][2] __initconst = {
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{0, 1}, {1, 2}, {2, 6}, {2, 3},
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{1, 3}, {1, 4}, {1, 2}, {2, 6},
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{0, 1}, {1, 6}, {2, 10}, {0, 1},
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{1, 4}, {0, 1}, {0, 1}, {2, 5},
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{0, 1}, {0, 1}, {0, 1}, {1, 2},
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{2, 6}, {0, 1}, {0, 1}, {0, 1},
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{0, 1}, {0, 1}, {0, 1}, {1, 1},
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{0, 1}, {0, 1}, {0, 1}, {0, 1},
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};
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static const int a370_dramclk_ratios[32][2] __initconst = {
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{0, 1}, {1, 2}, {2, 3}, {2, 3},
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{1, 3}, {1, 2}, {1, 2}, {2, 6},
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{0, 1}, {1, 3}, {2, 5}, {0, 1},
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{1, 4}, {0, 1}, {0, 1}, {2, 5},
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{0, 1}, {0, 1}, {0, 1}, {1, 1},
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{2, 3}, {0, 1}, {0, 1}, {0, 1},
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{0, 1}, {0, 1}, {0, 1}, {1, 1},
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{0, 1}, {0, 1}, {0, 1}, {0, 1},
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};
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static void __init a370_get_clk_ratio(
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void __iomem *sar, int id, int *mult, int *div)
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{
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u32 opt = ((readl(sar) >> SARL_A370_FAB_FREQ_OPT) &
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SARL_A370_FAB_FREQ_OPT_MASK);
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switch (id) {
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case A370_CPU_TO_NBCLK:
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*mult = a370_nbclk_ratios[opt][0];
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*div = a370_nbclk_ratios[opt][1];
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break;
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case A370_CPU_TO_HCLK:
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*mult = a370_hclk_ratios[opt][0];
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*div = a370_hclk_ratios[opt][1];
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break;
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case A370_CPU_TO_DRAMCLK:
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*mult = a370_dramclk_ratios[opt][0];
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*div = a370_dramclk_ratios[opt][1];
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break;
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}
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}
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static bool a370_is_sscg_enabled(void __iomem *sar)
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{
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return !(readl(sar) & SARL_A370_SSCG_ENABLE);
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}
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static const struct coreclk_soc_desc a370_coreclks = {
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.get_tclk_freq = a370_get_tclk_freq,
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.get_cpu_freq = a370_get_cpu_freq,
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.get_clk_ratio = a370_get_clk_ratio,
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.is_sscg_enabled = a370_is_sscg_enabled,
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.fix_sscg_deviation = kirkwood_fix_sscg_deviation,
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.ratios = a370_coreclk_ratios,
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.num_ratios = ARRAY_SIZE(a370_coreclk_ratios),
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};
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/*
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* Clock Gating Control
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*/
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static const struct clk_gating_soc_desc a370_gating_desc[] __initconst = {
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{ "audio", NULL, 0, 0 },
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{ "pex0_en", NULL, 1, 0 },
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{ "pex1_en", NULL, 2, 0 },
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{ "ge1", NULL, 3, 0 },
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{ "ge0", NULL, 4, 0 },
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{ "pex0", "pex0_en", 5, 0 },
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{ "pex1", "pex1_en", 9, 0 },
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{ "sata0", NULL, 15, 0 },
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{ "sdio", NULL, 17, 0 },
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{ "tdm", NULL, 25, 0 },
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{ "ddr", NULL, 28, CLK_IGNORE_UNUSED },
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{ "sata1", NULL, 30, 0 },
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{ }
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};
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static void __init a370_clk_init(struct device_node *np)
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{
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struct device_node *cgnp =
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of_find_compatible_node(NULL, NULL, "marvell,armada-370-gating-clock");
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mvebu_coreclk_setup(np, &a370_coreclks);
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if (cgnp)
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mvebu_clk_gating_setup(cgnp, a370_gating_desc);
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}
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CLK_OF_DECLARE(a370_clk, "marvell,armada-370-core-clock", a370_clk_init);
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