diff options
Diffstat (limited to 'arch/sh/kernel/cpu/sh4a/clock-sh7757.c')
-rw-r--r-- | arch/sh/kernel/cpu/sh4a/clock-sh7757.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7757.c b/arch/sh/kernel/cpu/sh4a/clock-sh7757.c new file mode 100644 index 0000000..ddc235c --- /dev/null +++ b/arch/sh/kernel/cpu/sh4a/clock-sh7757.c @@ -0,0 +1,130 @@ +/* + * arch/sh/kernel/cpu/sh4/clock-sh7757.c + * + * SH7757 support for the clock framework + * + * Copyright (C) 2009 Renesas Solutions Corp. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/io.h> +#include <asm/clock.h> +#include <asm/freq.h> + +static int ifc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1, + 16, 1, 1, 32, 1, 1, 1, 1 }; +static int sfc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1, + 16, 1, 1, 32, 1, 1, 1, 1 }; +static int bfc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1, + 16, 1, 1, 32, 1, 1, 1, 1 }; +static int p1fc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1, + 16, 1, 1, 32, 1, 1, 1, 1 }; + +static void master_clk_init(struct clk *clk) +{ + clk->rate = CONFIG_SH_PCLK_FREQ * 16; +} + +static struct clk_ops sh7757_master_clk_ops = { + .init = master_clk_init, +}; + +static void module_clk_recalc(struct clk *clk) +{ + int idx = ctrl_inl(FRQCR) & 0x0000000f; + clk->rate = clk->parent->rate / p1fc_divisors[idx]; +} + +static struct clk_ops sh7757_module_clk_ops = { + .recalc = module_clk_recalc, +}; + +static void bus_clk_recalc(struct clk *clk) +{ + int idx = (ctrl_inl(FRQCR) >> 8) & 0x0000000f; + clk->rate = clk->parent->rate / bfc_divisors[idx]; +} + +static struct clk_ops sh7757_bus_clk_ops = { + .recalc = bus_clk_recalc, +}; + +static void cpu_clk_recalc(struct clk *clk) +{ + int idx = (ctrl_inl(FRQCR) >> 20) & 0x0000000f; + clk->rate = clk->parent->rate / ifc_divisors[idx]; +} + +static struct clk_ops sh7757_cpu_clk_ops = { + .recalc = cpu_clk_recalc, +}; + +static struct clk_ops *sh7757_clk_ops[] = { + &sh7757_master_clk_ops, + &sh7757_module_clk_ops, + &sh7757_bus_clk_ops, + &sh7757_cpu_clk_ops, +}; + +void __init arch_init_clk_ops(struct clk_ops **ops, int idx) +{ + if (idx < ARRAY_SIZE(sh7757_clk_ops)) + *ops = sh7757_clk_ops[idx]; +} + +static void shyway_clk_recalc(struct clk *clk) +{ + int idx = (ctrl_inl(FRQCR) >> 12) & 0x0000000f; + clk->rate = clk->parent->rate / sfc_divisors[idx]; +} + +static struct clk_ops sh7757_shyway_clk_ops = { + .recalc = shyway_clk_recalc, +}; + +static struct clk sh7757_shyway_clk = { + .name = "shyway_clk", + .flags = CLK_ENABLE_ON_INIT, + .ops = &sh7757_shyway_clk_ops, +}; + +/* + * Additional sh7757-specific on-chip clocks that aren't already part of the + * clock framework + */ +static struct clk *sh7757_onchip_clocks[] = { + &sh7757_shyway_clk, +}; + +static int __init sh7757_clk_init(void) +{ + struct clk *clk = clk_get(NULL, "master_clk"); + int i; + + for (i = 0; i < ARRAY_SIZE(sh7757_onchip_clocks); i++) { + struct clk *clkp = sh7757_onchip_clocks[i]; + + clkp->parent = clk; + clk_register(clkp); + clk_enable(clkp); + } + + /* + * Now that we have the rest of the clocks registered, we need to + * force the parent clock to propagate so that these clocks will + * automatically figure out their rate. We cheat by handing the + * parent clock its current rate and forcing child propagation. + */ + clk_set_rate(clk, clk_get_rate(clk)); + + clk_put(clk); + + return 0; +} + +arch_initcall(sh7757_clk_init); + |