diff options
Diffstat (limited to 'arch/arm/mach-shmobile/clock-r8a7779.c')
| -rw-r--r-- | arch/arm/mach-shmobile/clock-r8a7779.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/clock-r8a7779.c b/arch/arm/mach-shmobile/clock-r8a7779.c new file mode 100644 index 00000000000..b4b0e8cd096 --- /dev/null +++ b/arch/arm/mach-shmobile/clock-r8a7779.c @@ -0,0 +1,176 @@ +/* + * r8a7779 clock framework support + * + * Copyright (C) 2011 Renesas Solutions Corp. + * Copyright (C) 2011 Magnus Damm + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/sh_clk.h> +#include <linux/clkdev.h> +#include <mach/common.h> + +#define FRQMR 0xffc80014 +#define MSTPCR0 0xffc80030 +#define MSTPCR1 0xffc80034 +#define MSTPCR3 0xffc8003c +#define MSTPSR1 0xffc80044 +#define MSTPSR4 0xffc80048 +#define MSTPSR6 0xffc8004c +#define MSTPCR4 0xffc80050 +#define MSTPCR5 0xffc80054 +#define MSTPCR6 0xffc80058 +#define MSTPCR7 0xffc80040 + +/* ioremap() through clock mapping mandatory to avoid + * collision with ARM coherent DMA virtual memory range. + */ + +static struct clk_mapping cpg_mapping = { + .phys = 0xffc80000, + .len = 0x80, +}; + +/* + * Default rate for the root input clock, reset this with clk_set_rate() + * from the platform code. + */ +static struct clk plla_clk = { + .rate = 1500000000, + .mapping = &cpg_mapping, +}; + +static struct clk *main_clks[] = { + &plla_clk, +}; + +static int divisors[] = { 0, 0, 0, 6, 8, 12, 16, 0, 24, 32, 36, 0, 0, 0, 0, 0 }; + +static struct clk_div_mult_table div4_div_mult_table = { + .divisors = divisors, + .nr_divisors = ARRAY_SIZE(divisors), +}; + +static struct clk_div4_table div4_table = { + .div_mult_table = &div4_div_mult_table, +}; + +enum { DIV4_S, DIV4_OUT, DIV4_S4, DIV4_S3, DIV4_S1, DIV4_P, DIV4_NR }; + +static struct clk div4_clks[DIV4_NR] = { + [DIV4_S] = SH_CLK_DIV4(&plla_clk, FRQMR, 20, + 0x0018, CLK_ENABLE_ON_INIT), + [DIV4_OUT] = SH_CLK_DIV4(&plla_clk, FRQMR, 16, + 0x0700, CLK_ENABLE_ON_INIT), + [DIV4_S4] = SH_CLK_DIV4(&plla_clk, FRQMR, 12, + 0x0040, CLK_ENABLE_ON_INIT), + [DIV4_S3] = SH_CLK_DIV4(&plla_clk, FRQMR, 8, + 0x0010, CLK_ENABLE_ON_INIT), + [DIV4_S1] = SH_CLK_DIV4(&plla_clk, FRQMR, 4, + 0x0060, CLK_ENABLE_ON_INIT), + [DIV4_P] = SH_CLK_DIV4(&plla_clk, FRQMR, 0, + 0x0300, CLK_ENABLE_ON_INIT), +}; + +enum { MSTP026, MSTP025, MSTP024, MSTP023, MSTP022, MSTP021, + MSTP016, MSTP015, MSTP014, + MSTP_NR }; + +static struct clk mstp_clks[MSTP_NR] = { + [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0), /* SCIF0 */ + [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0), /* SCIF1 */ + [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0), /* SCIF2 */ + [MSTP023] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 23, 0), /* SCIF3 */ + [MSTP022] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 22, 0), /* SCIF4 */ + [MSTP021] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 21, 0), /* SCIF5 */ + [MSTP016] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 16, 0), /* TMU0 */ + [MSTP015] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0), /* TMU1 */ + [MSTP014] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 14, 0), /* TMU2 */ +}; + +static unsigned long mul4_recalc(struct clk *clk) +{ + return clk->parent->rate * 4; +} + +static struct clk_ops mul4_clk_ops = { + .recalc = mul4_recalc, +}; + +struct clk clkz_clk = { + .ops = &mul4_clk_ops, + .parent = &div4_clks[DIV4_S], +}; + +struct clk clkzs_clk = { + /* clks x 4 / 4 = clks */ + .parent = &div4_clks[DIV4_S], +}; + +static struct clk *late_main_clks[] = { + &clkz_clk, + &clkzs_clk, +}; + +static struct clk_lookup lookups[] = { + /* main clocks */ + CLKDEV_CON_ID("plla_clk", &plla_clk), + CLKDEV_CON_ID("clkz_clk", &clkz_clk), + CLKDEV_CON_ID("clkzs_clk", &clkzs_clk), + + /* DIV4 clocks */ + CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_S]), + CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_OUT]), + CLKDEV_CON_ID("shyway4_clk", &div4_clks[DIV4_S4]), + CLKDEV_CON_ID("shyway3_clk", &div4_clks[DIV4_S3]), + CLKDEV_CON_ID("shyway1_clk", &div4_clks[DIV4_S1]), + CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]), + + /* MSTP32 clocks */ + CLKDEV_DEV_ID("sh_tmu.0", &mstp_clks[MSTP016]), /* TMU00 */ + CLKDEV_DEV_ID("sh_tmu.1", &mstp_clks[MSTP016]), /* TMU01 */ + CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP026]), /* SCIF0 */ + CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP025]), /* SCIF1 */ + CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP024]), /* SCIF2 */ + CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP023]), /* SCIF3 */ + CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP022]), /* SCIF4 */ + CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP021]), /* SCIF6 */ +}; + +void __init r8a7779_clock_init(void) +{ + int k, ret = 0; + + for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++) + ret = clk_register(main_clks[k]); + + if (!ret) + ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table); + + if (!ret) + ret = sh_clk_mstp32_register(mstp_clks, MSTP_NR); + + for (k = 0; !ret && (k < ARRAY_SIZE(late_main_clks)); k++) + ret = clk_register(late_main_clks[k]); + + clkdev_add_table(lookups, ARRAY_SIZE(lookups)); + + if (!ret) + clk_init(); + else + panic("failed to setup r8a7779 clocks\n"); +} |