ARM: S5P64X0: Update Clock for S5P6440 and S5P6450

This patch updates regarding clock files for supporting S5P6440 and
S5P6450 with one kernel image. The mach-s5p64x0/clock.c is for common
of them and there are specific clock files for each SoCs.

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 253 insertions, 0 deletions

diff --git a/arch/arm/mach-s5p64x0/clock.c b/arch/arm/mach-s5p64x0/clock.c
new file mode 100644
index 000000000000..523ba8039ac2
--- /dev/null
+++ b/arch/arm/mach-s5p64x0/clock.c
@@ -0,0 +1,253 @@
+/* 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)},
+};
+
+int s5p64x0_epll_enable(struct clk *clk, int enable)
+{
+        unsigned int ctrlbit = clk->ctrlbit;
+        unsigned int epll_con = __raw_readl(S5P64X0_EPLL_CON) & ~ctrlbit;
+
+        if (enable)
+                __raw_writel(epll_con | ctrlbit, S5P64X0_EPLL_CON);
+        else
+                __raw_writel(epll_con, S5P64X0_EPLL_CON);
+
+        return 0;
+}
+
+unsigned long s5p64x0_epll_get_rate(struct clk *clk)
+{
+        return clk->rate;
+}
+
+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;
+}