--- /dev/null
+/* linux/arch/arm/mach-s5p64x0/clock.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * S5P64X0 - Clock support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/sysdev.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/map.h>
+#include <mach/regs-clock.h>
+
+#include <plat/cpu-freq.h>
+#include <plat/clock.h>
+#include <plat/cpu.h>
+#include <plat/pll.h>
+#include <plat/s5p-clock.h>
+#include <plat/clock-clksrc.h>
+#include <plat/s5p6440.h>
+#include <plat/s5p6450.h>
+
+struct clksrc_clk clk_mout_apll = {
+ .clk = {
+ .name = "mout_apll",
+ .id = -1,
+ },
+ .sources = &clk_src_apll,
+ .reg_src = { .reg = S5P64X0_CLK_SRC0, .shift = 0, .size = 1 },
+};
+
+struct clksrc_clk clk_mout_mpll = {
+ .clk = {
+ .name = "mout_mpll",
+ .id = -1,
+ },
+ .sources = &clk_src_mpll,
+ .reg_src = { .reg = S5P64X0_CLK_SRC0, .shift = 1, .size = 1 },
+};
+
+struct clksrc_clk clk_mout_epll = {
+ .clk = {
+ .name = "mout_epll",
+ .id = -1,
+ },
+ .sources = &clk_src_epll,
+ .reg_src = { .reg = S5P64X0_CLK_SRC0, .shift = 2, .size = 1 },
+};
+
+enum perf_level {
+ L0 = 532*1000,
+ L1 = 266*1000,
+ L2 = 133*1000,
+};
+
+static const u32 clock_table[][3] = {
+ /*{ARM_CLK, DIVarm, DIVhclk}*/
+ {L0 * 1000, (0 << ARM_DIV_RATIO_SHIFT), (3 << S5P64X0_CLKDIV0_HCLK_SHIFT)},
+ {L1 * 1000, (1 << ARM_DIV_RATIO_SHIFT), (1 << S5P64X0_CLKDIV0_HCLK_SHIFT)},
+ {L2 * 1000, (3 << ARM_DIV_RATIO_SHIFT), (0 << S5P64X0_CLKDIV0_HCLK_SHIFT)},
+};
+
+unsigned long s5p64x0_armclk_get_rate(struct clk *clk)
+{
+ unsigned long rate = clk_get_rate(clk->parent);
+ u32 clkdiv;
+
+ /* divisor mask starts at bit0, so no need to shift */
+ clkdiv = __raw_readl(ARM_CLK_DIV) & ARM_DIV_MASK;
+
+ return rate / (clkdiv + 1);
+}
+
+unsigned long s5p64x0_armclk_round_rate(struct clk *clk, unsigned long rate)
+{
+ u32 iter;
+
+ for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
+ if (rate > clock_table[iter][0])
+ return clock_table[iter-1][0];
+ }
+
+ return clock_table[ARRAY_SIZE(clock_table) - 1][0];
+}
+
+int s5p64x0_armclk_set_rate(struct clk *clk, unsigned long rate)
+{
+ u32 round_tmp;
+ u32 iter;
+ u32 clk_div0_tmp;
+ u32 cur_rate = clk->ops->get_rate(clk);
+ unsigned long flags;
+
+ round_tmp = clk->ops->round_rate(clk, rate);
+ if (round_tmp == cur_rate)
+ return 0;
+
+
+ for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
+ if (round_tmp == clock_table[iter][0])
+ break;
+ }
+
+ if (iter >= ARRAY_SIZE(clock_table))
+ iter = ARRAY_SIZE(clock_table) - 1;
+
+ local_irq_save(flags);
+ if (cur_rate > round_tmp) {
+ /* Frequency Down */
+ clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
+ clk_div0_tmp |= clock_table[iter][1];
+ __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+
+ clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
+ ~(S5P64X0_CLKDIV0_HCLK_MASK);
+ clk_div0_tmp |= clock_table[iter][2];
+ __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+
+
+ } else {
+ /* Frequency Up */
+ clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
+ ~(S5P64X0_CLKDIV0_HCLK_MASK);
+ clk_div0_tmp |= clock_table[iter][2];
+ __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+
+ clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
+ clk_div0_tmp |= clock_table[iter][1];
+ __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+ }
+ local_irq_restore(flags);
+
+ clk->rate = clock_table[iter][0];
+
+ return 0;
+}
+
+struct clk_ops s5p64x0_clkarm_ops = {
+ .get_rate = s5p64x0_armclk_get_rate,
+ .set_rate = s5p64x0_armclk_set_rate,
+ .round_rate = s5p64x0_armclk_round_rate,
+};
+
+struct clksrc_clk clk_armclk = {
+ .clk = {
+ .name = "armclk",
+ .id = 1,
+ .parent = &clk_mout_apll.clk,
+ .ops = &s5p64x0_clkarm_ops,
+ },
+ .reg_div = { .reg = S5P64X0_CLK_DIV0, .shift = 0, .size = 4 },
+};
+
+struct clksrc_clk clk_dout_mpll = {
+ .clk = {
+ .name = "dout_mpll",
+ .id = -1,
+ .parent = &clk_mout_mpll.clk,
+ },
+ .reg_div = { .reg = S5P64X0_CLK_DIV0, .shift = 4, .size = 1 },
+};
+
+struct clk *clkset_hclk_low_list[] = {
+ &clk_mout_apll.clk,
+ &clk_mout_mpll.clk,
+};
+
+struct clksrc_sources clkset_hclk_low = {
+ .sources = clkset_hclk_low_list,
+ .nr_sources = ARRAY_SIZE(clkset_hclk_low_list),
+};
+
+int s5p64x0_pclk_ctrl(struct clk *clk, int enable)
+{
+ return s5p_gatectrl(S5P64X0_CLK_GATE_PCLK, clk, enable);
+}
+
+int s5p64x0_hclk0_ctrl(struct clk *clk, int enable)
+{
+ return s5p_gatectrl(S5P64X0_CLK_GATE_HCLK0, clk, enable);
+}
+
+int s5p64x0_hclk1_ctrl(struct clk *clk, int enable)
+{
+ return s5p_gatectrl(S5P64X0_CLK_GATE_HCLK1, clk, enable);
+}
+
+int s5p64x0_sclk_ctrl(struct clk *clk, int enable)
+{
+ return s5p_gatectrl(S5P64X0_CLK_GATE_SCLK0, clk, enable);
+}
+
+int s5p64x0_sclk1_ctrl(struct clk *clk, int enable)
+{
+ return s5p_gatectrl(S5P64X0_CLK_GATE_SCLK1, clk, enable);
+}
+
+int s5p64x0_mem_ctrl(struct clk *clk, int enable)
+{
+ return s5p_gatectrl(S5P64X0_CLK_GATE_MEM0, clk, enable);
+}
+
+int s5p64x0_clk48m_ctrl(struct clk *clk, int enable)
+{
+ unsigned long flags;
+ u32 val;
+
+ /* can't rely on clock lock, this register has other usages */
+ local_irq_save(flags);
+
+ val = __raw_readl(S5P64X0_OTHERS);
+ if (enable)
+ val |= S5P64X0_OTHERS_USB_SIG_MASK;
+ else
+ val &= ~S5P64X0_OTHERS_USB_SIG_MASK;
+
+ __raw_writel(val, S5P64X0_OTHERS);
+
+ local_irq_restore(flags);
+
+ return 0;
+}
projects / mv-sheeva.git / blobdiff