diff options
Diffstat (limited to 'kernel/drivers/clk/mvebu/armada-39x.c')
| -rw-r--r-- | kernel/drivers/clk/mvebu/armada-39x.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/kernel/drivers/clk/mvebu/armada-39x.c b/kernel/drivers/clk/mvebu/armada-39x.c new file mode 100644 index 000000000..efb974df9 --- /dev/null +++ b/kernel/drivers/clk/mvebu/armada-39x.c @@ -0,0 +1,156 @@ +/* + * Marvell Armada 39x SoC clocks + * + * Copyright (C) 2015 Marvell + * + * Gregory CLEMENT <gregory.clement@free-electrons.com> + * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> + * Andrew Lunn <andrew@lunn.ch> + * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> + * + * 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" + +/* + * SARL[14:10] : Ratios between CPU, NBCLK, HCLK and DCLK. + * + * SARL[15] : TCLK frequency + * 0 = 250 MHz + * 1 = 200 MHz + * + * SARH[0] : Reference clock frequency + * 0 = 25 Mhz + * 1 = 40 Mhz + */ + +#define SARL 0 +#define SARL_A390_TCLK_FREQ_OPT 15 +#define SARL_A390_TCLK_FREQ_OPT_MASK 0x1 +#define SARL_A390_CPU_DDR_L2_FREQ_OPT 10 +#define SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK 0x1F +#define SARH 4 +#define SARH_A390_REFCLK_FREQ BIT(0) + +static const u32 armada_39x_tclk_frequencies[] __initconst = { + 250000000, + 200000000, +}; + +static u32 __init armada_39x_get_tclk_freq(void __iomem *sar) +{ + u8 tclk_freq_select; + + tclk_freq_select = ((readl(sar + SARL) >> SARL_A390_TCLK_FREQ_OPT) & + SARL_A390_TCLK_FREQ_OPT_MASK); + return armada_39x_tclk_frequencies[tclk_freq_select]; +} + +static const u32 armada_39x_cpu_frequencies[] __initconst = { + [0x0] = 666 * 1000 * 1000, + [0x2] = 800 * 1000 * 1000, + [0x3] = 800 * 1000 * 1000, + [0x4] = 1066 * 1000 * 1000, + [0x5] = 1066 * 1000 * 1000, + [0x6] = 1200 * 1000 * 1000, + [0x8] = 1332 * 1000 * 1000, + [0xB] = 1600 * 1000 * 1000, + [0xC] = 1600 * 1000 * 1000, + [0x12] = 1800 * 1000 * 1000, + [0x1E] = 1800 * 1000 * 1000, +}; + +static u32 __init armada_39x_get_cpu_freq(void __iomem *sar) +{ + u8 cpu_freq_select; + + cpu_freq_select = ((readl(sar + SARL) >> SARL_A390_CPU_DDR_L2_FREQ_OPT) & + SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK); + if (cpu_freq_select >= ARRAY_SIZE(armada_39x_cpu_frequencies)) { + pr_err("Selected CPU frequency (%d) unsupported\n", + cpu_freq_select); + return 0; + } + + return armada_39x_cpu_frequencies[cpu_freq_select]; +} + +enum { A390_CPU_TO_NBCLK, A390_CPU_TO_HCLK, A390_CPU_TO_DCLK }; + +static const struct coreclk_ratio armada_39x_coreclk_ratios[] __initconst = { + { .id = A390_CPU_TO_NBCLK, .name = "nbclk" }, + { .id = A390_CPU_TO_HCLK, .name = "hclk" }, + { .id = A390_CPU_TO_DCLK, .name = "dclk" }, +}; + +static void __init armada_39x_get_clk_ratio( + void __iomem *sar, int id, int *mult, int *div) +{ + switch (id) { + case A390_CPU_TO_NBCLK: + *mult = 1; + *div = 2; + break; + case A390_CPU_TO_HCLK: + *mult = 1; + *div = 4; + break; + case A390_CPU_TO_DCLK: + *mult = 1; + *div = 2; + break; + } +} + +static u32 __init armada_39x_refclk_ratio(void __iomem *sar) +{ + if (readl(sar + SARH) & SARH_A390_REFCLK_FREQ) + return 40 * 1000 * 1000; + else + return 25 * 1000 * 1000; +} + +static const struct coreclk_soc_desc armada_39x_coreclks = { + .get_tclk_freq = armada_39x_get_tclk_freq, + .get_cpu_freq = armada_39x_get_cpu_freq, + .get_clk_ratio = armada_39x_get_clk_ratio, + .get_refclk_freq = armada_39x_refclk_ratio, + .ratios = armada_39x_coreclk_ratios, + .num_ratios = ARRAY_SIZE(armada_39x_coreclk_ratios), +}; + +static void __init armada_39x_coreclk_init(struct device_node *np) +{ + mvebu_coreclk_setup(np, &armada_39x_coreclks); +} +CLK_OF_DECLARE(armada_39x_core_clk, "marvell,armada-390-core-clock", + armada_39x_coreclk_init); + +/* + * Clock Gating Control + */ +static const struct clk_gating_soc_desc armada_39x_gating_desc[] __initconst = { + { "pex1", NULL, 5 }, + { "pex2", NULL, 6 }, + { "pex3", NULL, 7 }, + { "pex0", NULL, 8 }, + { "usb3h0", NULL, 9 }, + { "sdio", NULL, 17 }, + { "xor0", NULL, 22 }, + { "xor1", NULL, 28 }, + { } +}; + +static void __init armada_39x_clk_gating_init(struct device_node *np) +{ + mvebu_clk_gating_setup(np, armada_39x_gating_desc); +} +CLK_OF_DECLARE(armada_39x_clk_gating, "marvell,armada-390-gating-clock", + armada_39x_clk_gating_init); |