ARM: pxa: separate the clock support into clock-{pxa2xx,pxa3xx}.c

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 161 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/clock-pxa3xx.c b/arch/arm/mach-pxa/clock-pxa3xx.c
new file mode 100644
index 000000000000..34a36c4af19b
--- /dev/null
+++ b/arch/arm/mach-pxa/clock-pxa3xx.c
@@ -0,0 +1,161 @@
+/*
+ * linux/arch/arm/mach-pxa/clock-pxa3xx.c
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <mach/pxa3xx-regs.h>
+
+#include "clock.h"
+
+/* Crystal clock: 13MHz */
+#define BASE_CLK        13000000
+
+/* Ring Oscillator Clock: 60MHz */
+#define RO_CLK          60000000
+
+#define ACCR_D0CS       (1 << 26)
+#define ACCR_PCCE       (1 << 11)
+
+/* crystal frequency to static memory controller multiplier (SMCFS) */
+static unsigned char smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, };
+
+/* crystal frequency to HSIO bus frequency multiplier (HSS) */
+static unsigned char hss_mult[4] = { 8, 12, 16, 24 };
+
+/*
+ * Get the clock frequency as reflected by CCSR and the turbo flag.
+ * We assume these values have been applied via a fcs.
+ * If info is not 0 we also display the current settings.
+ */
+unsigned int pxa3xx_get_clk_frequency_khz(int info)
+{
+        unsigned long acsr, xclkcfg;
+        unsigned int t, xl, xn, hss, ro, XL, XN, CLK, HSS;
+
+        /* Read XCLKCFG register turbo bit */
+        __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg));
+        t = xclkcfg & 0x1;
+
+        acsr = ACSR;
+
+        xl  = acsr & 0x1f;
+        xn  = (acsr >> 8) & 0x7;
+        hss = (acsr >> 14) & 0x3;
+
+        XL = xl * BASE_CLK;
+        XN = xn * XL;
+
+        ro = acsr & ACCR_D0CS;
+
+        CLK = (ro) ? RO_CLK : ((t) ? XN : XL);
+        HSS = (ro) ? RO_CLK : hss_mult[hss] * BASE_CLK;
+
+        if (info) {
+                pr_info("RO Mode clock: %d.%02dMHz (%sactive)\n",
+                        RO_CLK / 1000000, (RO_CLK % 1000000) / 10000,
+                        (ro) ? "" : "in");
+                pr_info("Run Mode clock: %d.%02dMHz (*%d)\n",
+                        XL / 1000000, (XL % 1000000) / 10000, xl);
+                pr_info("Turbo Mode clock: %d.%02dMHz (*%d, %sactive)\n",
+                        XN / 1000000, (XN % 1000000) / 10000, xn,
+                        (t) ? "" : "in");
+                pr_info("HSIO bus clock: %d.%02dMHz\n",
+                        HSS / 1000000, (HSS % 1000000) / 10000);
+        }
+
+        return CLK / 1000;
+}
+
+/*
+ * Return the current AC97 clock frequency.
+ */
+static unsigned long clk_pxa3xx_ac97_getrate(struct clk *clk)
+{
+        unsigned long rate = 312000000;
+        unsigned long ac97_div;
+
+        ac97_div = AC97_DIV;
+
+        /* This may loose precision for some rates but won't for the
+         * standard 24.576MHz.
+         */
+        rate /= (ac97_div >> 12) & 0x7fff;
+        rate *= (ac97_div & 0xfff);
+
+        return rate;
+}
+
+/*
+ * Return the current HSIO bus clock frequency
+ */
+static unsigned long clk_pxa3xx_hsio_getrate(struct clk *clk)
+{
+        unsigned long acsr;
+        unsigned int hss, hsio_clk;
+
+        acsr = ACSR;
+
+        hss = (acsr >> 14) & 0x3;
+        hsio_clk = (acsr & ACCR_D0CS) ? RO_CLK : hss_mult[hss] * BASE_CLK;
+
+        return hsio_clk;
+}
+
+void clk_pxa3xx_cken_enable(struct clk *clk)
+{
+        unsigned long mask = 1ul << (clk->cken & 0x1f);
+
+        if (clk->cken < 32)
+                CKENA |= mask;
+        else
+                CKENB |= mask;
+}
+
+void clk_pxa3xx_cken_disable(struct clk *clk)
+{
+        unsigned long mask = 1ul << (clk->cken & 0x1f);
+
+        if (clk->cken < 32)
+                CKENA &= ~mask;
+        else
+                CKENB &= ~mask;
+}
+
+const struct clkops clk_pxa3xx_cken_ops = {
+        .enable         = clk_pxa3xx_cken_enable,
+        .disable        = clk_pxa3xx_cken_disable,
+};
+
+const struct clkops clk_pxa3xx_hsio_ops = {
+        .enable         = clk_pxa3xx_cken_enable,
+        .disable        = clk_pxa3xx_cken_disable,
+        .getrate        = clk_pxa3xx_hsio_getrate,
+};
+
+const struct clkops clk_pxa3xx_ac97_ops = {
+        .enable         = clk_pxa3xx_cken_enable,
+        .disable        = clk_pxa3xx_cken_disable,
+        .getrate        = clk_pxa3xx_ac97_getrate,
+};
+
+static void clk_pout_enable(struct clk *clk)
+{
+        OSCC |= OSCC_PEN;
+}
+
+static void clk_pout_disable(struct clk *clk)
+{
+        OSCC &= ~OSCC_PEN;
+}
+
+const struct clkops clk_pxa3xx_pout_ops = {
+        .enable         = clk_pout_enable,
+        .disable        = clk_pout_disable,
+};