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-rw-r--r--arch/arm/mach-imx/clock-imx35.c549
1 files changed, 549 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/clock-imx35.c b/arch/arm/mach-imx/clock-imx35.c
new file mode 100644
index 000000000000..5a4cc1ea405b
--- /dev/null
+++ b/arch/arm/mach-imx/clock-imx35.c
@@ -0,0 +1,549 @@
+/*
+ * Copyright (C) 2009 by Sascha Hauer, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/clkdev.h>
+
+#include <mach/clock.h>
+#include <mach/hardware.h>
+#include <mach/common.h>
+
+#define CCM_BASE MX35_IO_ADDRESS(MX35_CCM_BASE_ADDR)
+
+#define CCM_CCMR 0x00
+#define CCM_PDR0 0x04
+#define CCM_PDR1 0x08
+#define CCM_PDR2 0x0C
+#define CCM_PDR3 0x10
+#define CCM_PDR4 0x14
+#define CCM_RCSR 0x18
+#define CCM_MPCTL 0x1C
+#define CCM_PPCTL 0x20
+#define CCM_ACMR 0x24
+#define CCM_COSR 0x28
+#define CCM_CGR0 0x2C
+#define CCM_CGR1 0x30
+#define CCM_CGR2 0x34
+#define CCM_CGR3 0x38
+
+#ifdef HAVE_SET_RATE_SUPPORT
+static void calc_dividers(u32 div, u32 *pre, u32 *post, u32 maxpost)
+{
+ u32 min_pre, temp_pre, old_err, err;
+
+ min_pre = (div - 1) / maxpost + 1;
+ old_err = 8;
+
+ for (temp_pre = 8; temp_pre >= min_pre; temp_pre--) {
+ if (div > (temp_pre * maxpost))
+ break;
+
+ if (div < (temp_pre * temp_pre))
+ continue;
+
+ err = div % temp_pre;
+
+ if (err == 0) {
+ *pre = temp_pre;
+ break;
+ }
+
+ err = temp_pre - err;
+
+ if (err < old_err) {
+ old_err = err;
+ *pre = temp_pre;
+ }
+ }
+
+ *post = (div + *pre - 1) / *pre;
+}
+
+/* get the best values for a 3-bit divider combined with a 6-bit divider */
+static void calc_dividers_3_6(u32 div, u32 *pre, u32 *post)
+{
+ if (div >= 512) {
+ *pre = 8;
+ *post = 64;
+ } else if (div >= 64) {
+ calc_dividers(div, pre, post, 64);
+ } else if (div <= 8) {
+ *pre = div;
+ *post = 1;
+ } else {
+ *pre = 1;
+ *post = div;
+ }
+}
+
+/* get the best values for two cascaded 3-bit dividers */
+static void calc_dividers_3_3(u32 div, u32 *pre, u32 *post)
+{
+ if (div >= 64) {
+ *pre = *post = 8;
+ } else if (div > 8) {
+ calc_dividers(div, pre, post, 8);
+ } else {
+ *pre = 1;
+ *post = div;
+ }
+}
+#endif
+
+static unsigned long get_rate_mpll(void)
+{
+ ulong mpctl = __raw_readl(CCM_BASE + CCM_MPCTL);
+
+ return mxc_decode_pll(mpctl, 24000000);
+}
+
+static unsigned long get_rate_ppll(void)
+{
+ ulong ppctl = __raw_readl(CCM_BASE + CCM_PPCTL);
+
+ return mxc_decode_pll(ppctl, 24000000);
+}
+
+struct arm_ahb_div {
+ unsigned char arm, ahb, sel;
+};
+
+static struct arm_ahb_div clk_consumer[] = {
+ { .arm = 1, .ahb = 4, .sel = 0},
+ { .arm = 1, .ahb = 3, .sel = 1},
+ { .arm = 2, .ahb = 2, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+ { .arm = 4, .ahb = 1, .sel = 0},
+ { .arm = 1, .ahb = 5, .sel = 0},
+ { .arm = 1, .ahb = 8, .sel = 0},
+ { .arm = 1, .ahb = 6, .sel = 1},
+ { .arm = 2, .ahb = 4, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+ { .arm = 4, .ahb = 2, .sel = 0},
+ { .arm = 0, .ahb = 0, .sel = 0},
+};
+
+static unsigned long get_rate_arm(void)
+{
+ unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
+ struct arm_ahb_div *aad;
+ unsigned long fref = get_rate_mpll();
+
+ aad = &clk_consumer[(pdr0 >> 16) & 0xf];
+ if (aad->sel)
+ fref = fref * 3 / 4;
+
+ return fref / aad->arm;
+}
+
+static unsigned long get_rate_ahb(struct clk *clk)
+{
+ unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
+ struct arm_ahb_div *aad;
+ unsigned long fref = get_rate_arm();
+
+ aad = &clk_consumer[(pdr0 >> 16) & 0xf];
+
+ return fref / aad->ahb;
+}
+
+static unsigned long get_rate_ipg(struct clk *clk)
+{
+ return get_rate_ahb(NULL) >> 1;
+}
+
+static unsigned long get_rate_uart(struct clk *clk)
+{
+ unsigned long pdr3 = __raw_readl(CCM_BASE + CCM_PDR3);
+ unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
+ unsigned long div = ((pdr4 >> 10) & 0x3f) + 1;
+
+ if (pdr3 & (1 << 14))
+ return get_rate_arm() / div;
+ else
+ return get_rate_ppll() / div;
+}
+
+static unsigned long get_rate_sdhc(struct clk *clk)
+{
+ unsigned long pdr3 = __raw_readl(CCM_BASE + CCM_PDR3);
+ unsigned long div, rate;
+
+ if (pdr3 & (1 << 6))
+ rate = get_rate_arm();
+ else
+ rate = get_rate_ppll();
+
+ switch (clk->id) {
+ default:
+ case 0:
+ div = pdr3 & 0x3f;
+ break;
+ case 1:
+ div = (pdr3 >> 8) & 0x3f;
+ break;
+ case 2:
+ div = (pdr3 >> 16) & 0x3f;
+ break;
+ }
+
+ return rate / (div + 1);
+}
+
+static unsigned long get_rate_mshc(struct clk *clk)
+{
+ unsigned long pdr1 = __raw_readl(CCM_BASE + CCM_PDR1);
+ unsigned long div1, div2, rate;
+
+ if (pdr1 & (1 << 7))
+ rate = get_rate_arm();
+ else
+ rate = get_rate_ppll();
+
+ div1 = (pdr1 >> 29) & 0x7;
+ div2 = (pdr1 >> 22) & 0x3f;
+
+ return rate / ((div1 + 1) * (div2 + 1));
+}
+
+static unsigned long get_rate_ssi(struct clk *clk)
+{
+ unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
+ unsigned long div1, div2, rate;
+
+ if (pdr2 & (1 << 6))
+ rate = get_rate_arm();
+ else
+ rate = get_rate_ppll();
+
+ switch (clk->id) {
+ default:
+ case 0:
+ div1 = pdr2 & 0x3f;
+ div2 = (pdr2 >> 24) & 0x7;
+ break;
+ case 1:
+ div1 = (pdr2 >> 8) & 0x3f;
+ div2 = (pdr2 >> 27) & 0x7;
+ break;
+ }
+
+ return rate / ((div1 + 1) * (div2 + 1));
+}
+
+static unsigned long get_rate_csi(struct clk *clk)
+{
+ unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
+ unsigned long rate;
+
+ if (pdr2 & (1 << 7))
+ rate = get_rate_arm();
+ else
+ rate = get_rate_ppll();
+
+ return rate / (((pdr2 >> 16) & 0x3f) + 1);
+}
+
+static unsigned long get_rate_otg(struct clk *clk)
+{
+ unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
+ unsigned long rate;
+
+ if (pdr4 & (1 << 9))
+ rate = get_rate_arm();
+ else
+ rate = get_rate_ppll();
+
+ return rate / (((pdr4 >> 22) & 0x3f) + 1);
+}
+
+static unsigned long get_rate_ipg_per(struct clk *clk)
+{
+ unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
+ unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
+ unsigned long div;
+
+ if (pdr0 & (1 << 26)) {
+ div = (pdr4 >> 16) & 0x3f;
+ return get_rate_arm() / (div + 1);
+ } else {
+ div = (pdr0 >> 12) & 0x7;
+ return get_rate_ahb(NULL) / (div + 1);
+ }
+}
+
+static unsigned long get_rate_hsp(struct clk *clk)
+{
+ unsigned long hsp_podf = (__raw_readl(CCM_BASE + CCM_PDR0) >> 20) & 0x03;
+ unsigned long fref = get_rate_mpll();
+
+ if (fref > 400 * 1000 * 1000) {
+ switch (hsp_podf) {
+ case 0:
+ return fref >> 2;
+ case 1:
+ return fref >> 3;
+ case 2:
+ return fref / 3;
+ }
+ } else {
+ switch (hsp_podf) {
+ case 0:
+ case 2:
+ return fref / 3;
+ case 1:
+ return fref / 6;
+ }
+ }
+
+ return 0;
+}
+
+static int clk_cgr_enable(struct clk *clk)
+{
+ u32 reg;
+
+ reg = __raw_readl(clk->enable_reg);
+ reg |= 3 << clk->enable_shift;
+ __raw_writel(reg, clk->enable_reg);
+
+ return 0;
+}
+
+static void clk_cgr_disable(struct clk *clk)
+{
+ u32 reg;
+
+ reg = __raw_readl(clk->enable_reg);
+ reg &= ~(3 << clk->enable_shift);
+ __raw_writel(reg, clk->enable_reg);
+}
+
+#define DEFINE_CLOCK(name, i, er, es, gr, sr) \
+ static struct clk name = { \
+ .id = i, \
+ .enable_reg = CCM_BASE + er, \
+ .enable_shift = es, \
+ .get_rate = gr, \
+ .set_rate = sr, \
+ .enable = clk_cgr_enable, \
+ .disable = clk_cgr_disable, \
+ }
+
+DEFINE_CLOCK(asrc_clk, 0, CCM_CGR0, 0, NULL, NULL);
+DEFINE_CLOCK(ata_clk, 0, CCM_CGR0, 2, get_rate_ipg, NULL);
+/* DEFINE_CLOCK(audmux_clk, 0, CCM_CGR0, 4, NULL, NULL); */
+DEFINE_CLOCK(can1_clk, 0, CCM_CGR0, 6, get_rate_ipg, NULL);
+DEFINE_CLOCK(can2_clk, 1, CCM_CGR0, 8, get_rate_ipg, NULL);
+DEFINE_CLOCK(cspi1_clk, 0, CCM_CGR0, 10, get_rate_ipg, NULL);
+DEFINE_CLOCK(cspi2_clk, 1, CCM_CGR0, 12, get_rate_ipg, NULL);
+DEFINE_CLOCK(ect_clk, 0, CCM_CGR0, 14, get_rate_ipg, NULL);
+DEFINE_CLOCK(edio_clk, 0, CCM_CGR0, 16, NULL, NULL);
+DEFINE_CLOCK(emi_clk, 0, CCM_CGR0, 18, get_rate_ipg, NULL);
+DEFINE_CLOCK(epit1_clk, 0, CCM_CGR0, 20, get_rate_ipg, NULL);
+DEFINE_CLOCK(epit2_clk, 1, CCM_CGR0, 22, get_rate_ipg, NULL);
+DEFINE_CLOCK(esai_clk, 0, CCM_CGR0, 24, NULL, NULL);
+DEFINE_CLOCK(esdhc1_clk, 0, CCM_CGR0, 26, get_rate_sdhc, NULL);
+DEFINE_CLOCK(esdhc2_clk, 1, CCM_CGR0, 28, get_rate_sdhc, NULL);
+DEFINE_CLOCK(esdhc3_clk, 2, CCM_CGR0, 30, get_rate_sdhc, NULL);
+
+DEFINE_CLOCK(fec_clk, 0, CCM_CGR1, 0, get_rate_ipg, NULL);
+DEFINE_CLOCK(gpio1_clk, 0, CCM_CGR1, 2, NULL, NULL);
+DEFINE_CLOCK(gpio2_clk, 1, CCM_CGR1, 4, NULL, NULL);
+DEFINE_CLOCK(gpio3_clk, 2, CCM_CGR1, 6, NULL, NULL);
+DEFINE_CLOCK(gpt_clk, 0, CCM_CGR1, 8, get_rate_ipg, NULL);
+DEFINE_CLOCK(i2c1_clk, 0, CCM_CGR1, 10, get_rate_ipg_per, NULL);
+DEFINE_CLOCK(i2c2_clk, 1, CCM_CGR1, 12, get_rate_ipg_per, NULL);
+DEFINE_CLOCK(i2c3_clk, 2, CCM_CGR1, 14, get_rate_ipg_per, NULL);
+DEFINE_CLOCK(iomuxc_clk, 0, CCM_CGR1, 16, NULL, NULL);
+DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, get_rate_hsp, NULL);
+DEFINE_CLOCK(kpp_clk, 0, CCM_CGR1, 20, get_rate_ipg, NULL);
+DEFINE_CLOCK(mlb_clk, 0, CCM_CGR1, 22, get_rate_ahb, NULL);
+DEFINE_CLOCK(mshc_clk, 0, CCM_CGR1, 24, get_rate_mshc, NULL);
+DEFINE_CLOCK(owire_clk, 0, CCM_CGR1, 26, get_rate_ipg_per, NULL);
+DEFINE_CLOCK(pwm_clk, 0, CCM_CGR1, 28, get_rate_ipg_per, NULL);
+DEFINE_CLOCK(rngc_clk, 0, CCM_CGR1, 30, get_rate_ipg, NULL);
+
+DEFINE_CLOCK(rtc_clk, 0, CCM_CGR2, 0, get_rate_ipg, NULL);
+DEFINE_CLOCK(rtic_clk, 0, CCM_CGR2, 2, get_rate_ahb, NULL);
+DEFINE_CLOCK(scc_clk, 0, CCM_CGR2, 4, get_rate_ipg, NULL);
+DEFINE_CLOCK(sdma_clk, 0, CCM_CGR2, 6, NULL, NULL);
+DEFINE_CLOCK(spba_clk, 0, CCM_CGR2, 8, get_rate_ipg, NULL);
+DEFINE_CLOCK(spdif_clk, 0, CCM_CGR2, 10, NULL, NULL);
+DEFINE_CLOCK(ssi1_clk, 0, CCM_CGR2, 12, get_rate_ssi, NULL);
+DEFINE_CLOCK(ssi2_clk, 1, CCM_CGR2, 14, get_rate_ssi, NULL);
+DEFINE_CLOCK(uart1_clk, 0, CCM_CGR2, 16, get_rate_uart, NULL);
+DEFINE_CLOCK(uart2_clk, 1, CCM_CGR2, 18, get_rate_uart, NULL);
+DEFINE_CLOCK(uart3_clk, 2, CCM_CGR2, 20, get_rate_uart, NULL);
+DEFINE_CLOCK(usbotg_clk, 0, CCM_CGR2, 22, get_rate_otg, NULL);
+DEFINE_CLOCK(wdog_clk, 0, CCM_CGR2, 24, NULL, NULL);
+DEFINE_CLOCK(max_clk, 0, CCM_CGR2, 26, NULL, NULL);
+DEFINE_CLOCK(audmux_clk, 0, CCM_CGR2, 30, NULL, NULL);
+
+DEFINE_CLOCK(csi_clk, 0, CCM_CGR3, 0, get_rate_csi, NULL);
+DEFINE_CLOCK(iim_clk, 0, CCM_CGR3, 2, NULL, NULL);
+DEFINE_CLOCK(gpu2d_clk, 0, CCM_CGR3, 4, NULL, NULL);
+
+DEFINE_CLOCK(usbahb_clk, 0, 0, 0, get_rate_ahb, NULL);
+
+static int clk_dummy_enable(struct clk *clk)
+{
+ return 0;
+}
+
+static void clk_dummy_disable(struct clk *clk)
+{
+}
+
+static unsigned long get_rate_nfc(struct clk *clk)
+{
+ unsigned long div1;
+
+ div1 = (__raw_readl(CCM_BASE + CCM_PDR4) >> 28) + 1;
+
+ return get_rate_ahb(NULL) / div1;
+}
+
+/* NAND Controller: It seems it can't be disabled */
+static struct clk nfc_clk = {
+ .id = 0,
+ .enable_reg = 0,
+ .enable_shift = 0,
+ .get_rate = get_rate_nfc,
+ .set_rate = NULL, /* set_rate_nfc, */
+ .enable = clk_dummy_enable,
+ .disable = clk_dummy_disable
+};
+
+#define _REGISTER_CLOCK(d, n, c) \
+ { \
+ .dev_id = d, \
+ .con_id = n, \
+ .clk = &c, \
+ },
+
+static struct clk_lookup lookups[] = {
+ _REGISTER_CLOCK(NULL, "asrc", asrc_clk)
+ _REGISTER_CLOCK(NULL, "ata", ata_clk)
+ _REGISTER_CLOCK("flexcan.0", NULL, can1_clk)
+ _REGISTER_CLOCK("flexcan.1", NULL, can2_clk)
+ _REGISTER_CLOCK("imx35-cspi.0", NULL, cspi1_clk)
+ _REGISTER_CLOCK("imx35-cspi.1", NULL, cspi2_clk)
+ _REGISTER_CLOCK(NULL, "ect", ect_clk)
+ _REGISTER_CLOCK(NULL, "edio", edio_clk)
+ _REGISTER_CLOCK(NULL, "emi", emi_clk)
+ _REGISTER_CLOCK("imx-epit.0", NULL, epit1_clk)
+ _REGISTER_CLOCK("imx-epit.1", NULL, epit2_clk)
+ _REGISTER_CLOCK(NULL, "esai", esai_clk)
+ _REGISTER_CLOCK("sdhci-esdhc-imx.0", NULL, esdhc1_clk)
+ _REGISTER_CLOCK("sdhci-esdhc-imx.1", NULL, esdhc2_clk)
+ _REGISTER_CLOCK("sdhci-esdhc-imx.2", NULL, esdhc3_clk)
+ _REGISTER_CLOCK("fec.0", NULL, fec_clk)
+ _REGISTER_CLOCK(NULL, "gpio", gpio1_clk)
+ _REGISTER_CLOCK(NULL, "gpio", gpio2_clk)
+ _REGISTER_CLOCK(NULL, "gpio", gpio3_clk)
+ _REGISTER_CLOCK("gpt.0", NULL, gpt_clk)
+ _REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
+ _REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
+ _REGISTER_CLOCK("imx-i2c.2", NULL, i2c3_clk)
+ _REGISTER_CLOCK(NULL, "iomuxc", iomuxc_clk)
+ _REGISTER_CLOCK("ipu-core", NULL, ipu_clk)
+ _REGISTER_CLOCK("mx3_sdc_fb", NULL, ipu_clk)
+ _REGISTER_CLOCK(NULL, "kpp", kpp_clk)
+ _REGISTER_CLOCK(NULL, "mlb", mlb_clk)
+ _REGISTER_CLOCK(NULL, "mshc", mshc_clk)
+ _REGISTER_CLOCK("mxc_w1", NULL, owire_clk)
+ _REGISTER_CLOCK(NULL, "pwm", pwm_clk)
+ _REGISTER_CLOCK(NULL, "rngc", rngc_clk)
+ _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
+ _REGISTER_CLOCK(NULL, "rtic", rtic_clk)
+ _REGISTER_CLOCK(NULL, "scc", scc_clk)
+ _REGISTER_CLOCK("imx-sdma", NULL, sdma_clk)
+ _REGISTER_CLOCK(NULL, "spba", spba_clk)
+ _REGISTER_CLOCK(NULL, "spdif", spdif_clk)
+ _REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
+ _REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
+ _REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
+ _REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
+ _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
+ _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
+ _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
+ _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
+ _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
+ _REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", usbahb_clk)
+ _REGISTER_CLOCK("imx2-wdt.0", NULL, wdog_clk)
+ _REGISTER_CLOCK(NULL, "max", max_clk)
+ _REGISTER_CLOCK(NULL, "audmux", audmux_clk)
+ _REGISTER_CLOCK(NULL, "csi", csi_clk)
+ _REGISTER_CLOCK(NULL, "iim", iim_clk)
+ _REGISTER_CLOCK(NULL, "gpu2d", gpu2d_clk)
+ _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
+};
+
+int __init mx35_clocks_init()
+{
+ unsigned int cgr2 = 3 << 26, cgr3 = 0;
+
+#if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
+ cgr2 |= 3 << 16;
+#endif
+
+ clkdev_add_table(lookups, ARRAY_SIZE(lookups));
+
+ /* Turn off all clocks except the ones we need to survive, namely:
+ * EMI, GPIO1/2/3, GPT, IOMUX, MAX and eventually uart
+ */
+ __raw_writel((3 << 18), CCM_BASE + CCM_CGR0);
+ __raw_writel((3 << 2) | (3 << 4) | (3 << 6) | (3 << 8) | (3 << 16),
+ CCM_BASE + CCM_CGR1);
+
+ /*
+ * Check if we came up in internal boot mode. If yes, we need some
+ * extra clocks turned on, otherwise the MX35 boot ROM code will
+ * hang after a watchdog reset.
+ */
+ if (!(__raw_readl(CCM_BASE + CCM_RCSR) & (3 << 10))) {
+ /* Additionally turn on UART1, SCC, and IIM clocks */
+ cgr2 |= 3 << 16 | 3 << 4;
+ cgr3 |= 3 << 2;
+ }
+
+ __raw_writel(cgr2, CCM_BASE + CCM_CGR2);
+ __raw_writel(cgr3, CCM_BASE + CCM_CGR3);
+
+ clk_enable(&iim_clk);
+ mx35_read_cpu_rev();
+
+#ifdef CONFIG_MXC_USE_EPIT
+ epit_timer_init(&epit1_clk,
+ MX35_IO_ADDRESS(MX35_EPIT1_BASE_ADDR), MX35_INT_EPIT1);
+#else
+ mxc_timer_init(&gpt_clk,
+ MX35_IO_ADDRESS(MX35_GPT1_BASE_ADDR), MX35_INT_GPT);
+#endif
+
+ return 0;
+}
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