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Diffstat (limited to 'arch/sh/kernel/cpu/sh2a/clock-sh7269.c')
-rw-r--r--arch/sh/kernel/cpu/sh2a/clock-sh7269.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh2a/clock-sh7269.c b/arch/sh/kernel/cpu/sh2a/clock-sh7269.c
new file mode 100644
index 000000000000..6b787620de99
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh2a/clock-sh7269.c
@@ -0,0 +1,184 @@
+/*
+ * arch/sh/kernel/cpu/sh2a/clock-sh7269.c
+ *
+ * SH7269 clock framework support
+ *
+ * Copyright (C) 2012 Phil Edworthy
+ *
+ * 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 <linux/clkdev.h>
+#include <asm/clock.h>
+
+/* SH7269 registers */
+#define FRQCR 0xfffe0010
+#define STBCR3 0xfffe0408
+#define STBCR4 0xfffe040c
+#define STBCR5 0xfffe0410
+#define STBCR6 0xfffe0414
+#define STBCR7 0xfffe0418
+
+#define PLL_RATE 20
+
+/* Fixed 32 KHz root clock for RTC */
+static struct clk r_clk = {
+ .rate = 32768,
+};
+
+/*
+ * Default rate for the root input clock, reset this with clk_set_rate()
+ * from the platform code.
+ */
+static struct clk extal_clk = {
+ .rate = 13340000,
+};
+
+static unsigned long pll_recalc(struct clk *clk)
+{
+ return clk->parent->rate * PLL_RATE;
+}
+
+static struct sh_clk_ops pll_clk_ops = {
+ .recalc = pll_recalc,
+};
+
+static struct clk pll_clk = {
+ .ops = &pll_clk_ops,
+ .parent = &extal_clk,
+ .flags = CLK_ENABLE_ON_INIT,
+};
+
+static unsigned long peripheral0_recalc(struct clk *clk)
+{
+ return clk->parent->rate / 8;
+}
+
+static struct sh_clk_ops peripheral0_clk_ops = {
+ .recalc = peripheral0_recalc,
+};
+
+static struct clk peripheral0_clk = {
+ .ops = &peripheral0_clk_ops,
+ .parent = &pll_clk,
+ .flags = CLK_ENABLE_ON_INIT,
+};
+
+static unsigned long peripheral1_recalc(struct clk *clk)
+{
+ return clk->parent->rate / 4;
+}
+
+static struct sh_clk_ops peripheral1_clk_ops = {
+ .recalc = peripheral1_recalc,
+};
+
+static struct clk peripheral1_clk = {
+ .ops = &peripheral1_clk_ops,
+ .parent = &pll_clk,
+ .flags = CLK_ENABLE_ON_INIT,
+};
+
+struct clk *main_clks[] = {
+ &r_clk,
+ &extal_clk,
+ &pll_clk,
+ &peripheral0_clk,
+ &peripheral1_clk,
+};
+
+static int div2[] = { 1, 2, 0, 4 };
+
+static struct clk_div_mult_table div4_div_mult_table = {
+ .divisors = div2,
+ .nr_divisors = ARRAY_SIZE(div2),
+};
+
+static struct clk_div4_table div4_table = {
+ .div_mult_table = &div4_div_mult_table,
+};
+
+enum { DIV4_I, DIV4_B,
+ DIV4_NR };
+
+#define DIV4(_reg, _bit, _mask, _flags) \
+ SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
+
+/* The mask field specifies the div2 entries that are valid */
+struct clk div4_clks[DIV4_NR] = {
+ [DIV4_I] = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT
+ | CLK_ENABLE_ON_INIT),
+ [DIV4_B] = DIV4(FRQCR, 4, 0xA, CLK_ENABLE_REG_16BIT
+ | CLK_ENABLE_ON_INIT),
+};
+
+enum { MSTP72,
+ MSTP60,
+ MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40,
+ MSTP35, MSTP32, MSTP30,
+ MSTP_NR };
+
+static struct clk mstp_clks[MSTP_NR] = {
+ [MSTP72] = SH_CLK_MSTP8(&peripheral0_clk, STBCR7, 2, 0), /* CMT */
+ [MSTP60] = SH_CLK_MSTP8(&peripheral1_clk, STBCR6, 0, 0), /* USB */
+ [MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */
+ [MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */
+ [MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */
+ [MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */
+ [MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */
+ [MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */
+ [MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */
+ [MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */
+ [MSTP35] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 5, 0), /* MTU2 */
+ [MSTP32] = SH_CLK_MSTP8(&peripheral1_clk, STBCR3, 2, 0), /* ADC */
+ [MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */
+};
+
+static struct clk_lookup lookups[] = {
+ /* main clocks */
+ CLKDEV_CON_ID("rclk", &r_clk),
+ CLKDEV_CON_ID("extal", &extal_clk),
+ CLKDEV_CON_ID("pll_clk", &pll_clk),
+ CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk),
+
+ /* DIV4 clocks */
+ CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
+ CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
+
+ /* MSTP clocks */
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP47]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP46]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP45]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP44]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.4", &mstp_clks[MSTP43]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.5", &mstp_clks[MSTP42]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.6", &mstp_clks[MSTP41]),
+ CLKDEV_ICK_ID("sci_fck", "sh-sci.7", &mstp_clks[MSTP40]),
+ CLKDEV_CON_ID("cmt_fck", &mstp_clks[MSTP72]),
+ CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]),
+ CLKDEV_CON_ID("mtu2_fck", &mstp_clks[MSTP35]),
+ CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]),
+ CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]),
+};
+
+int __init arch_clk_init(void)
+{
+ int k, ret = 0;
+
+ for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
+ ret = clk_register(main_clks[k]);
+
+ clkdev_add_table(lookups, ARRAY_SIZE(lookups));
+
+ if (!ret)
+ ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
+
+ if (!ret)
+ ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
+
+ return ret;
+}