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authorSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>2013-05-11 05:08:06 +0400
committerJason Cooper <jason@lakedaemon.net>2013-05-29 23:20:59 +0400
commit68be12bda2cbb8317c76d4a94d5bbb8f88d48ce3 (patch)
treeee978ab01f513fa165abc841a7281a2a346497e1 /drivers/clk/mvebu/armada-xp.c
parent6b72333d5b2ef3a01f4e255a32c7c5c74ecf84d0 (diff)
downloadlinux-68be12bda2cbb8317c76d4a94d5bbb8f88d48ce3.tar.xz
clk: mvebu: add Armada XP SoC-centric clock init
This is moving core clock and clock gating init for Armada XP to its own file and adds a Kconfig option. Also init functions are added and declared so they get called on of_clk_init. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/clk/mvebu/armada-xp.c')
-rw-r--r--drivers/clk/mvebu/armada-xp.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/clk/mvebu/armada-xp.c b/drivers/clk/mvebu/armada-xp.c
new file mode 100644
index 000000000000..13b62ceb3407
--- /dev/null
+++ b/drivers/clk/mvebu/armada-xp.c
@@ -0,0 +1,210 @@
+/*
+ * Marvell Armada XP SoC clocks
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include "common.h"
+
+/*
+ * Core Clocks
+ *
+ * Armada XP Sample At Reset is a 64 bit bitfiled split in two
+ * register of 32 bits
+ */
+
+#define SARL 0 /* Low part [0:31] */
+#define SARL_AXP_PCLK_FREQ_OPT 21
+#define SARL_AXP_PCLK_FREQ_OPT_MASK 0x7
+#define SARL_AXP_FAB_FREQ_OPT 24
+#define SARL_AXP_FAB_FREQ_OPT_MASK 0xF
+#define SARH 4 /* High part [32:63] */
+#define SARH_AXP_PCLK_FREQ_OPT (52-32)
+#define SARH_AXP_PCLK_FREQ_OPT_MASK 0x1
+#define SARH_AXP_PCLK_FREQ_OPT_SHIFT 3
+#define SARH_AXP_FAB_FREQ_OPT (51-32)
+#define SARH_AXP_FAB_FREQ_OPT_MASK 0x1
+#define SARH_AXP_FAB_FREQ_OPT_SHIFT 4
+
+enum { AXP_CPU_TO_NBCLK, AXP_CPU_TO_HCLK, AXP_CPU_TO_DRAMCLK };
+
+static const struct coreclk_ratio __initconst axp_coreclk_ratios[] = {
+ { .id = AXP_CPU_TO_NBCLK, .name = "nbclk" },
+ { .id = AXP_CPU_TO_HCLK, .name = "hclk" },
+ { .id = AXP_CPU_TO_DRAMCLK, .name = "dramclk" },
+};
+
+/* Armada XP TCLK frequency is fixed to 250MHz */
+static u32 __init axp_get_tclk_freq(void __iomem *sar)
+{
+ return 250000000;
+}
+
+static const u32 __initconst axp_cpu_freqs[] = {
+ 1000000000,
+ 1066000000,
+ 1200000000,
+ 1333000000,
+ 1500000000,
+ 1666000000,
+ 1800000000,
+ 2000000000,
+ 667000000,
+ 0,
+ 800000000,
+ 1600000000,
+};
+
+static u32 __init axp_get_cpu_freq(void __iomem *sar)
+{
+ u32 cpu_freq;
+ u8 cpu_freq_select = 0;
+
+ cpu_freq_select = ((readl(sar + SARL) >> SARL_AXP_PCLK_FREQ_OPT) &
+ SARL_AXP_PCLK_FREQ_OPT_MASK);
+ /*
+ * The upper bit is not contiguous to the other ones and
+ * located in the high part of the SAR registers
+ */
+ cpu_freq_select |= (((readl(sar + SARH) >> SARH_AXP_PCLK_FREQ_OPT) &
+ SARH_AXP_PCLK_FREQ_OPT_MASK) << SARH_AXP_PCLK_FREQ_OPT_SHIFT);
+ if (cpu_freq_select >= ARRAY_SIZE(axp_cpu_freqs)) {
+ pr_err("CPU freq select unsupported: %d\n", cpu_freq_select);
+ cpu_freq = 0;
+ } else
+ cpu_freq = axp_cpu_freqs[cpu_freq_select];
+
+ return cpu_freq;
+}
+
+static const int __initconst axp_nbclk_ratios[32][2] = {
+ {0, 1}, {1, 2}, {2, 2}, {2, 2},
+ {1, 2}, {1, 2}, {1, 1}, {2, 3},
+ {0, 1}, {1, 2}, {2, 4}, {0, 1},
+ {1, 2}, {0, 1}, {0, 1}, {2, 2},
+ {0, 1}, {0, 1}, {0, 1}, {1, 1},
+ {2, 3}, {0, 1}, {0, 1}, {0, 1},
+ {0, 1}, {0, 1}, {0, 1}, {1, 1},
+ {0, 1}, {0, 1}, {0, 1}, {0, 1},
+};
+
+static const int __initconst axp_hclk_ratios[32][2] = {
+ {0, 1}, {1, 2}, {2, 6}, {2, 3},
+ {1, 3}, {1, 4}, {1, 2}, {2, 6},
+ {0, 1}, {1, 6}, {2, 10}, {0, 1},
+ {1, 4}, {0, 1}, {0, 1}, {2, 5},
+ {0, 1}, {0, 1}, {0, 1}, {1, 2},
+ {2, 6}, {0, 1}, {0, 1}, {0, 1},
+ {0, 1}, {0, 1}, {0, 1}, {1, 1},
+ {0, 1}, {0, 1}, {0, 1}, {0, 1},
+};
+
+static const int __initconst axp_dramclk_ratios[32][2] = {
+ {0, 1}, {1, 2}, {2, 3}, {2, 3},
+ {1, 3}, {1, 2}, {1, 2}, {2, 6},
+ {0, 1}, {1, 3}, {2, 5}, {0, 1},
+ {1, 4}, {0, 1}, {0, 1}, {2, 5},
+ {0, 1}, {0, 1}, {0, 1}, {1, 1},
+ {2, 3}, {0, 1}, {0, 1}, {0, 1},
+ {0, 1}, {0, 1}, {0, 1}, {1, 1},
+ {0, 1}, {0, 1}, {0, 1}, {0, 1},
+};
+
+static void __init axp_get_clk_ratio(
+ void __iomem *sar, int id, int *mult, int *div)
+{
+ u32 opt = ((readl(sar + SARL) >> SARL_AXP_FAB_FREQ_OPT) &
+ SARL_AXP_FAB_FREQ_OPT_MASK);
+ /*
+ * The upper bit is not contiguous to the other ones and
+ * located in the high part of the SAR registers
+ */
+ opt |= (((readl(sar + SARH) >> SARH_AXP_FAB_FREQ_OPT) &
+ SARH_AXP_FAB_FREQ_OPT_MASK) << SARH_AXP_FAB_FREQ_OPT_SHIFT);
+
+ switch (id) {
+ case AXP_CPU_TO_NBCLK:
+ *mult = axp_nbclk_ratios[opt][0];
+ *div = axp_nbclk_ratios[opt][1];
+ break;
+ case AXP_CPU_TO_HCLK:
+ *mult = axp_hclk_ratios[opt][0];
+ *div = axp_hclk_ratios[opt][1];
+ break;
+ case AXP_CPU_TO_DRAMCLK:
+ *mult = axp_dramclk_ratios[opt][0];
+ *div = axp_dramclk_ratios[opt][1];
+ break;
+ }
+}
+
+static const struct coreclk_soc_desc axp_coreclks = {
+ .get_tclk_freq = axp_get_tclk_freq,
+ .get_cpu_freq = axp_get_cpu_freq,
+ .get_clk_ratio = axp_get_clk_ratio,
+ .ratios = axp_coreclk_ratios,
+ .num_ratios = ARRAY_SIZE(axp_coreclk_ratios),
+};
+
+static void __init axp_coreclk_init(struct device_node *np)
+{
+ mvebu_coreclk_setup(np, &axp_coreclks);
+}
+CLK_OF_DECLARE(axp_core_clk, "marvell,armada-xp-core-clock",
+ axp_coreclk_init);
+
+/*
+ * Clock Gating Control
+ */
+
+static const struct clk_gating_soc_desc __initconst axp_gating_desc[] = {
+ { "audio", NULL, 0, 0 },
+ { "ge3", NULL, 1, 0 },
+ { "ge2", NULL, 2, 0 },
+ { "ge1", NULL, 3, 0 },
+ { "ge0", NULL, 4, 0 },
+ { "pex00", NULL, 5, 0 },
+ { "pex01", NULL, 6, 0 },
+ { "pex02", NULL, 7, 0 },
+ { "pex03", NULL, 8, 0 },
+ { "pex10", NULL, 9, 0 },
+ { "pex11", NULL, 10, 0 },
+ { "pex12", NULL, 11, 0 },
+ { "pex13", NULL, 12, 0 },
+ { "bp", NULL, 13, 0 },
+ { "sata0lnk", NULL, 14, 0 },
+ { "sata0", "sata0lnk", 15, 0 },
+ { "lcd", NULL, 16, 0 },
+ { "sdio", NULL, 17, 0 },
+ { "usb0", NULL, 18, 0 },
+ { "usb1", NULL, 19, 0 },
+ { "usb2", NULL, 20, 0 },
+ { "xor0", NULL, 22, 0 },
+ { "crypto", NULL, 23, 0 },
+ { "tdm", NULL, 25, 0 },
+ { "pex20", NULL, 26, 0 },
+ { "pex30", NULL, 27, 0 },
+ { "xor1", NULL, 28, 0 },
+ { "sata1lnk", NULL, 29, 0 },
+ { "sata1", "sata1lnk", 30, 0 },
+ { }
+};
+
+static void __init axp_clk_gating_init(struct device_node *np)
+{
+ mvebu_clk_gating_setup(np, axp_gating_desc);
+}
+CLK_OF_DECLARE(axp_clk_gating, "marvell,armada-xp-gating-clock",
+ axp_clk_gating_init);