sh: sh7366 clock framework rewrite

This patch rewrites the sh7366 clock framework code.
The new code makes use of the recently merged div4,
div6 and mstp32 helper code. Both extal and dll are
supported as input clocks to the pll.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7366.c b/arch/sh/kernel/cpu/sh4a/clock-sh7366.c
new file mode 100644
index 000000000000..a95ebaba095c
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7366.c
@@ -0,0 +1,211 @@
+/*
+ * arch/sh/kernel/cpu/sh4a/clock-sh7366.c
+ *
+ * SH7366 clock framework support
+ *
+ * Copyright (C) 2009 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 <asm/clock.h>
+
+/* SH7366 registers */
+#define FRQCR           0xa4150000
+#define VCLKCR          0xa4150004
+#define SCLKACR         0xa4150008
+#define SCLKBCR         0xa415000c
+#define PLLCR           0xa4150024
+#define MSTPCR0         0xa4150030
+#define MSTPCR1         0xa4150034
+#define MSTPCR2         0xa4150038
+#define DLLFRQ          0xa4150050
+
+/* Fixed 32 KHz root clock for RTC and Power Management purposes */
+static struct clk r_clk = {
+        .name           = "rclk",
+        .id             = -1,
+        .rate           = 32768,
+};
+
+/*
+ * Default rate for the root input clock, reset this with clk_set_rate()
+ * from the platform code.
+ */
+struct clk extal_clk = {
+        .name           = "extal",
+        .id             = -1,
+        .rate           = 33333333,
+};
+
+/* The dll block multiplies the 32khz r_clk, may be used instead of extal */
+static unsigned long dll_recalc(struct clk *clk)
+{
+        unsigned long mult;
+
+        if (__raw_readl(PLLCR) & 0x1000)
+                mult = __raw_readl(DLLFRQ);
+        else
+                mult = 0;
+
+        return clk->parent->rate * mult;
+}
+
+static struct clk_ops dll_clk_ops = {
+        .recalc         = dll_recalc,
+};
+
+static struct clk dll_clk = {
+        .name           = "dll_clk",
+        .id             = -1,
+        .ops            = &dll_clk_ops,
+        .parent         = &r_clk,
+        .flags          = CLK_ENABLE_ON_INIT,
+};
+
+static unsigned long pll_recalc(struct clk *clk)
+{
+        unsigned long mult = 1;
+        unsigned long div = 1;
+
+        if (__raw_readl(PLLCR) & 0x4000)
+                mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
+        else
+                div = 2;
+
+        return (clk->parent->rate * mult) / div;
+}
+
+static struct clk_ops pll_clk_ops = {
+        .recalc         = pll_recalc,
+};
+
+static struct clk pll_clk = {
+        .name           = "pll_clk",
+        .id             = -1,
+        .ops            = &pll_clk_ops,
+        .flags          = CLK_ENABLE_ON_INIT,
+};
+
+struct clk *main_clks[] = {
+        &r_clk,
+        &extal_clk,
+        &dll_clk,
+        &pll_clk,
+};
+
+static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
+static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
+
+static struct clk_div_mult_table div4_table = {
+        .divisors = divisors,
+        .nr_divisors = ARRAY_SIZE(divisors),
+        .multipliers = multipliers,
+        .nr_multipliers = ARRAY_SIZE(multipliers),
+};
+
+enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P,
+       DIV4_SIUA, DIV4_SIUB, DIV4_NR };
+
+#define DIV4(_str, _reg, _bit, _mask, _flags) \
+  SH_CLK_DIV4(_str, &pll_clk, _reg, _bit, _mask, _flags)
+
+struct clk div4_clks[DIV4_NR] = {
+        [DIV4_I] = DIV4("cpu_clk", FRQCR, 20, 0x1fef, CLK_ENABLE_ON_INIT),
+        [DIV4_U] = DIV4("umem_clk", FRQCR, 16, 0x1fff, CLK_ENABLE_ON_INIT),
+        [DIV4_SH] = DIV4("shyway_clk", FRQCR, 12, 0x1fff, CLK_ENABLE_ON_INIT),
+        [DIV4_B] = DIV4("bus_clk", FRQCR, 8, 0x1fff, CLK_ENABLE_ON_INIT),
+        [DIV4_B3] = DIV4("b3_clk", FRQCR, 4, 0x1fff, CLK_ENABLE_ON_INIT),
+        [DIV4_P] = DIV4("peripheral_clk", FRQCR, 0, 0x1fff, 0),
+        [DIV4_SIUA] = DIV4("siua_clk", SCLKACR, 0, 0x1fff, 0),
+        [DIV4_SIUB] = DIV4("siub_clk", SCLKBCR, 0, 0x1fff, 0),
+};
+
+struct clk div6_clks[] = {
+        SH_CLK_DIV6("video_clk", &pll_clk, VCLKCR, 0),
+};
+
+#define MSTP(_str, _parent, _reg, _bit, _flags) \
+  SH_CLK_MSTP32(_str, -1, _parent, _reg, _bit, _flags)
+
+static struct clk mstp_clks[] = {
+        /* See page 52 of Datasheet V0.40: Overview -> Block Diagram */
+        MSTP("tlb0", &div4_clks[DIV4_I], MSTPCR0, 31, CLK_ENABLE_ON_INIT),
+        MSTP("ic0", &div4_clks[DIV4_I], MSTPCR0, 30, CLK_ENABLE_ON_INIT),
+        MSTP("oc0", &div4_clks[DIV4_I], MSTPCR0, 29, CLK_ENABLE_ON_INIT),
+        MSTP("rsmem0", &div4_clks[DIV4_SH], MSTPCR0, 28, CLK_ENABLE_ON_INIT),
+        MSTP("xymem0", &div4_clks[DIV4_B], MSTPCR0, 26, CLK_ENABLE_ON_INIT),
+        MSTP("intc3", &div4_clks[DIV4_P], MSTPCR0, 23, 0),
+        MSTP("intc0", &div4_clks[DIV4_P], MSTPCR0, 22, 0),
+        MSTP("dmac0", &div4_clks[DIV4_P], MSTPCR0, 21, 0),
+        MSTP("sh0", &div4_clks[DIV4_P], MSTPCR0, 20, 0),
+        MSTP("hudi0", &div4_clks[DIV4_P], MSTPCR0, 19, 0),
+        MSTP("ubc0", &div4_clks[DIV4_P], MSTPCR0, 17, 0),
+        MSTP("tmu0", &div4_clks[DIV4_P], MSTPCR0, 15, 0),
+        MSTP("cmt0", &r_clk, MSTPCR0, 14, 0),
+        MSTP("rwdt0", &r_clk, MSTPCR0, 13, 0),
+        MSTP("mfi0", &div4_clks[DIV4_P], MSTPCR0, 11, 0),
+        MSTP("flctl0", &div4_clks[DIV4_P], MSTPCR0, 10, 0),
+        MSTP("scif0", &div4_clks[DIV4_P], MSTPCR0, 7, 0),
+        MSTP("scif1", &div4_clks[DIV4_P], MSTPCR0, 6, 0),
+        MSTP("scif2", &div4_clks[DIV4_P], MSTPCR0, 5, 0),
+        MSTP("msiof0", &div4_clks[DIV4_P], MSTPCR0, 2, 0),
+        MSTP("sbr0", &div4_clks[DIV4_P], MSTPCR0, 1, 0),
+
+        MSTP("i2c0", &div4_clks[DIV4_P], MSTPCR1, 9, 0),
+
+        MSTP("icb0", &div4_clks[DIV4_P], MSTPCR2, 27, 0),
+        MSTP("meram0", &div4_clks[DIV4_P], MSTPCR2, 26, 0),
+        MSTP("dacy1", &div4_clks[DIV4_P], MSTPCR2, 24, 0),
+        MSTP("dacy0", &div4_clks[DIV4_P], MSTPCR2, 23, 0),
+        MSTP("tsif0", &div4_clks[DIV4_P], MSTPCR2, 22, 0),
+        MSTP("sdhi0", &div4_clks[DIV4_P], MSTPCR2, 18, 0),
+        MSTP("mmcif0", &div4_clks[DIV4_P], MSTPCR2, 17, 0),
+        MSTP("usbf0", &div4_clks[DIV4_P], MSTPCR2, 11, 0),
+        MSTP("siu0", &div4_clks[DIV4_B], MSTPCR2, 9, 0),
+        MSTP("veu1", &div4_clks[DIV4_B], MSTPCR2, 7, CLK_ENABLE_ON_INIT),
+        MSTP("vou0", &div4_clks[DIV4_B], MSTPCR2, 5, 0),
+        MSTP("beu0", &div4_clks[DIV4_B], MSTPCR2, 4, 0),
+        MSTP("ceu0", &div4_clks[DIV4_B], MSTPCR2, 3, 0),
+        MSTP("veu0", &div4_clks[DIV4_B], MSTPCR2, 2, CLK_ENABLE_ON_INIT),
+        MSTP("vpu0", &div4_clks[DIV4_B], MSTPCR2, 1, CLK_ENABLE_ON_INIT),
+        MSTP("lcdc0", &div4_clks[DIV4_B], MSTPCR2, 0, 0),
+};
+
+int __init arch_clk_init(void)
+{
+        int k, ret = 0;
+
+        /* autodetect extal or dll configuration */
+        if (__raw_readl(PLLCR) & 0x1000)
+                pll_clk.parent = &dll_clk;
+        else
+                pll_clk.parent = &extal_clk;
+
+        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_div6_register(div6_clks, ARRAY_SIZE(div6_clks));
+
+        if (!ret)
+                ret = sh_clk_mstp32_register(mstp_clks, ARRAY_SIZE(mstp_clks));
+
+        return ret;
+}