ARM: Add the clock framework for Telechips TCC8xxx processors.

This adds definitions and low-level functions to handle clocks in
TCC8xxx processors.

Signed-off-by: "Hans J. Koch" <hjk@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

8 files changed, 834 insertions, 11 deletions

diff --git a/arch/arm/mach-tcc8k/Makefile b/arch/arm/mach-tcc8k/Makefile
new file mode 100644
index 000000000000..805d850919eb
--- /dev/null
+++ b/arch/arm/mach-tcc8k/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for TCC8K boards and common files.
+#
+
+# Common support
+obj-y += clock.o
diff --git a/arch/arm/mach-tcc8k/clock.c b/arch/arm/mach-tcc8k/clock.c
new file mode 100644
index 000000000000..a8982af15326
--- /dev/null
+++ b/arch/arm/mach-tcc8k/clock.c
@@ -0,0 +1,566 @@
+/*
+ * Lowlevel clock handling for Telechips TCC8xxx SoCs
+ *
+ * Copyright (C) 2010 by Hans J. Koch <hjk@linutronix.de>
+ *
+ * Licensed under the terms of the GPL v2
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+#include <asm/clkdev.h>
+
+#include <mach/clock.h>
+#include <mach/irqs.h>
+#include <mach/tcc8k-regs.h>
+
+#include "common.h"
+
+#define BCLKCTR0        (CKC_BASE + BCLKCTR0_OFFS)
+#define BCLKCTR1        (CKC_BASE + BCLKCTR1_OFFS)
+
+#define ACLKREF         (CKC_BASE + ACLKREF_OFFS)
+#define ACLKUART0       (CKC_BASE + ACLKUART0_OFFS)
+#define ACLKUART1       (CKC_BASE + ACLKUART1_OFFS)
+#define ACLKUART2       (CKC_BASE + ACLKUART2_OFFS)
+#define ACLKUART3       (CKC_BASE + ACLKUART3_OFFS)
+#define ACLKUART4       (CKC_BASE + ACLKUART4_OFFS)
+#define ACLKI2C         (CKC_BASE + ACLKI2C_OFFS)
+#define ACLKADC         (CKC_BASE + ACLKADC_OFFS)
+#define ACLKUSBH        (CKC_BASE + ACLKUSBH_OFFS)
+#define ACLKLCD         (CKC_BASE + ACLKLCD_OFFS)
+#define ACLKSDH0        (CKC_BASE + ACLKSDH0_OFFS)
+#define ACLKSDH1        (CKC_BASE + ACLKSDH1_OFFS)
+#define ACLKSPI0        (CKC_BASE + ACLKSPI0_OFFS)
+#define ACLKSPI1        (CKC_BASE + ACLKSPI1_OFFS)
+#define ACLKSPDIF       (CKC_BASE + ACLKSPDIF_OFFS)
+#define ACLKC3DEC       (CKC_BASE + ACLKC3DEC_OFFS)
+#define ACLKCAN0        (CKC_BASE + ACLKCAN0_OFFS)
+#define ACLKCAN1        (CKC_BASE + ACLKCAN1_OFFS)
+#define ACLKGSB0        (CKC_BASE + ACLKGSB0_OFFS)
+#define ACLKGSB1        (CKC_BASE + ACLKGSB1_OFFS)
+#define ACLKGSB2        (CKC_BASE + ACLKGSB2_OFFS)
+#define ACLKGSB3        (CKC_BASE + ACLKGSB3_OFFS)
+#define ACLKUSBH        (CKC_BASE + ACLKUSBH_OFFS)
+#define ACLKTCT         (CKC_BASE + ACLKTCT_OFFS)
+#define ACLKTCX         (CKC_BASE + ACLKTCX_OFFS)
+#define ACLKTCZ         (CKC_BASE + ACLKTCZ_OFFS)
+
+/* Crystal frequencies */
+static unsigned long xi_rate, xti_rate;
+
+static void __iomem *pll_cfg_addr(int pll)
+{
+        switch (pll) {
+        case 0: return (CKC_BASE + PLL0CFG_OFFS);
+        case 1: return (CKC_BASE + PLL1CFG_OFFS);
+        case 2: return (CKC_BASE + PLL2CFG_OFFS);
+        default:
+                BUG();
+        }
+}
+
+static int pll_enable(int pll, int enable)
+{
+        u32 reg;
+        void __iomem *addr = pll_cfg_addr(pll);
+
+        reg = __raw_readl(addr);
+        if (enable)
+                reg &= ~PLLxCFG_PD;
+        else
+                reg |= PLLxCFG_PD;
+
+        __raw_writel(reg, addr);
+        return 0;
+}
+
+static int xi_enable(int enable)
+{
+        u32 reg;
+
+        reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS);
+        if (enable)
+                reg |= CLKCTRL_XE;
+        else
+                reg &= ~CLKCTRL_XE;
+
+        __raw_writel(reg, CKC_BASE + CLKCTRL_OFFS);
+        return 0;
+}
+
+static int root_clk_enable(enum root_clks src)
+{
+        switch (src) {
+        case CLK_SRC_PLL0: return pll_enable(0, 1);
+        case CLK_SRC_PLL1: return pll_enable(1, 1);
+        case CLK_SRC_PLL2: return pll_enable(2, 1);
+        case CLK_SRC_XI: return xi_enable(1);
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+static int root_clk_disable(enum root_clks root_src)
+{
+        switch (root_src) {
+        case CLK_SRC_PLL0: return pll_enable(0, 0);
+        case CLK_SRC_PLL1: return pll_enable(1, 0);
+        case CLK_SRC_PLL2: return pll_enable(2, 0);
+        case CLK_SRC_XI: return xi_enable(0);
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+static int enable_clk(struct clk *clk)
+{
+        u32 reg;
+
+        if (clk->root_id != CLK_SRC_NOROOT)
+                return root_clk_enable(clk->root_id);
+
+        if (clk->aclkreg) {
+                reg = __raw_readl(clk->aclkreg);
+                reg |= ACLK_EN;
+                __raw_writel(reg, clk->aclkreg);
+        }
+        if (clk->bclkctr) {
+                reg = __raw_readl(clk->bclkctr);
+                reg |= 1 << clk->bclk_shift;
+                __raw_writel(reg, clk->bclkctr);
+        }
+        return 0;
+}
+
+static void disable_clk(struct clk *clk)
+{
+        u32 reg;
+
+        if (clk->root_id != CLK_SRC_NOROOT) {
+                root_clk_disable(clk->root_id);
+                return;
+        }
+
+        if (clk->bclkctr) {
+                reg = __raw_readl(clk->bclkctr);
+                reg &= ~(1 << clk->bclk_shift);
+                __raw_writel(reg, clk->bclkctr);
+        }
+        if (clk->aclkreg) {
+                reg = __raw_readl(clk->aclkreg);
+                reg &= ~ACLK_EN;
+                __raw_writel(reg, clk->aclkreg);
+        }
+}
+
+static unsigned long get_rate_pll(int pll)
+{
+        u32 reg;
+        unsigned long s, m, p;
+        void __iomem *addr = pll_cfg_addr(pll);
+
+        reg = __raw_readl(addr);
+        s = (reg >> 16) & 0x07;
+        m = (reg >> 8) & 0xff;
+        p = reg & 0x3f;
+
+        return (m * xi_rate) / (p * (1 << s));
+}
+
+static unsigned long get_rate_pll_div(int pll)
+{
+        u32 reg;
+        unsigned long div = 0;
+        void __iomem *addr;