]> git.karo-electronics.de Git - linux-beck.git/commitdiff
ARM i.MX25: implement clocks using common clock framework
authorSascha Hauer <s.hauer@pengutronix.de>
Thu, 8 Mar 2012 21:24:12 +0000 (22:24 +0100)
committerSascha Hauer <s.hauer@pengutronix.de>
Wed, 2 May 2012 10:08:32 +0000 (12:08 +0200)
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
arch/arm/mach-imx/Kconfig
arch/arm/mach-imx/Makefile
arch/arm/mach-imx/clk-imx25.c [new file with mode: 0644]

index 7561eca131b0ba989c42afb1a5ec94fbce98f688..0b832b17d4fc3ab20b4c9576af6ddedf276e6884 100644 (file)
@@ -48,6 +48,7 @@ config SOC_IMX21
 config SOC_IMX25
        bool
        select ARCH_MX25
+       select COMMON_CLK
        select CPU_ARM926T
        select ARCH_MXC_IOMUX_V3
        select MXC_AVIC
index ae0a77960c22f9dda2c288eebd131bac6f672399..173e869f0590328fcc3130dda2b343db2f4f8433 100644 (file)
@@ -1,7 +1,7 @@
 obj-$(CONFIG_SOC_IMX1) += clock-imx1.o mm-imx1.o
 obj-$(CONFIG_SOC_IMX21) += clock-imx21.o mm-imx21.o
 
-obj-$(CONFIG_SOC_IMX25) += clock-imx25.o mm-imx25.o ehci-imx25.o cpu-imx25.o
+obj-$(CONFIG_SOC_IMX25) += clk-imx25.o mm-imx25.o ehci-imx25.o cpu-imx25.o
 
 obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o
 obj-$(CONFIG_SOC_IMX27) += clock-imx27.o mm-imx27.o ehci-imx27.o
diff --git a/arch/arm/mach-imx/clk-imx25.c b/arch/arm/mach-imx/clk-imx25.c
new file mode 100644 (file)
index 0000000..d9833bb
--- /dev/null
@@ -0,0 +1,248 @@
+/*
+ * 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 <linux/err.h>
+
+#include <mach/hardware.h>
+#include <mach/common.h>
+#include <mach/mx25.h>
+#include "clk.h"
+
+#define CRM_BASE       MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR)
+
+#define CCM_MPCTL      0x00
+#define CCM_UPCTL      0x04
+#define CCM_CCTL       0x08
+#define CCM_CGCR0      0x0C
+#define CCM_CGCR1      0x10
+#define CCM_CGCR2      0x14
+#define CCM_PCDR0      0x18
+#define CCM_PCDR1      0x1C
+#define CCM_PCDR2      0x20
+#define CCM_PCDR3      0x24
+#define CCM_RCSR       0x28
+#define CCM_CRDR       0x2C
+#define CCM_DCVR0      0x30
+#define CCM_DCVR1      0x34
+#define CCM_DCVR2      0x38
+#define CCM_DCVR3      0x3c
+#define CCM_LTR0       0x40
+#define CCM_LTR1       0x44
+#define CCM_LTR2       0x48
+#define CCM_LTR3       0x4c
+#define CCM_MCR                0x64
+
+#define ccm(x) (CRM_BASE + (x))
+
+static const char *cpu_sel_clks[] = { "mpll", "mpll_cpu_3_4", };
+static const char *per_sel_clks[] = { "ahb", "upll", };
+
+enum mx25_clks {
+       dummy, osc, mpll, upll, mpll_cpu_3_4, cpu_sel, cpu, ahb, usb_div, ipg,
+       per0_sel, per1_sel, per2_sel, per3_sel, per4_sel, per5_sel, per6_sel,
+       per7_sel, per8_sel, per9_sel, per10_sel, per11_sel, per12_sel,
+       per13_sel, per14_sel, per15_sel, per0, per1, per2, per3, per4, per5,
+       per6, per7, per8, per9, per10, per11, per12, per13, per14, per15,
+       csi_ipg_per, esdhc1_ipg_per, esdhc2_ipg_per, gpt_ipg_per, i2c_ipg_per,
+       lcdc_ipg_per, nfc_ipg_per, ssi1_ipg_per, ssi2_ipg_per, uart_ipg_per,
+       csi_ahb, esdhc1_ahb, esdhc2_ahb, fec_ahb, lcdc_ahb, sdma_ahb,
+       usbotg_ahb, can1_ipg, can2_ipg, csi_ipg, cspi1_ipg, cspi2_ipg,
+       cspi3_ipg, dryice_ipg, esdhc1_ipg, esdhc2_ipg, fec_ipg, iim_ipg,
+       kpp_ipg, lcdc_ipg, pwm1_ipg, pwm2_ipg, pwm3_ipg, pwm4_ipg, sdma_ipg,
+       ssi1_ipg, ssi2_ipg, tsc_ipg, uart1_ipg, uart2_ipg, uart3_ipg,
+       uart4_ipg, uart5_ipg, wdt_ipg, clk_max
+};
+
+static struct clk *clk[clk_max];
+
+int __init mx25_clocks_init(void)
+{
+       int i;
+
+       clk[dummy] = imx_clk_fixed("dummy", 0);
+       clk[osc] = imx_clk_fixed("osc", 24000000);
+       clk[mpll] = imx_clk_pllv1("mpll", "osc", ccm(CCM_MPCTL));
+       clk[upll] = imx_clk_pllv1("upll", "osc", ccm(CCM_UPCTL));
+       clk[mpll_cpu_3_4] = imx_clk_fixed_factor("mpll_cpu_3_4", "mpll", 3, 4);
+       clk[cpu_sel] = imx_clk_mux("cpu_sel", ccm(CCM_CCTL), 14, 1, cpu_sel_clks, ARRAY_SIZE(cpu_sel_clks));
+       clk[cpu] = imx_clk_divider("cpu", "cpu_sel", ccm(CCM_CCTL), 30, 2);
+       clk[ahb] = imx_clk_divider("ahb", "cpu", ccm(CCM_CCTL), 28, 2);
+       clk[usb_div] = imx_clk_divider("usb_div", "upll", ccm(CCM_CCTL), 16, 6); 
+       clk[ipg] = imx_clk_fixed_factor("ipg", "ahb", 1, 2);
+       clk[per0_sel] = imx_clk_mux("per0_sel", ccm(CCM_MCR), 0, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per1_sel] = imx_clk_mux("per1_sel", ccm(CCM_MCR), 1, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per2_sel] = imx_clk_mux("per2_sel", ccm(CCM_MCR), 2, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per3_sel] = imx_clk_mux("per3_sel", ccm(CCM_MCR), 3, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per4_sel] = imx_clk_mux("per4_sel", ccm(CCM_MCR), 4, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per5_sel] = imx_clk_mux("per5_sel", ccm(CCM_MCR), 5, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per6_sel] = imx_clk_mux("per6_sel", ccm(CCM_MCR), 6, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per7_sel] = imx_clk_mux("per7_sel", ccm(CCM_MCR), 7, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per8_sel] = imx_clk_mux("per8_sel", ccm(CCM_MCR), 8, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per9_sel] = imx_clk_mux("per9_sel", ccm(CCM_MCR), 9, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per10_sel] = imx_clk_mux("per10_sel", ccm(CCM_MCR), 10, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per11_sel] = imx_clk_mux("per11_sel", ccm(CCM_MCR), 11, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per12_sel] = imx_clk_mux("per12_sel", ccm(CCM_MCR), 12, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per13_sel] = imx_clk_mux("per13_sel", ccm(CCM_MCR), 13, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per14_sel] = imx_clk_mux("per14_sel", ccm(CCM_MCR), 14, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per15_sel] = imx_clk_mux("per15_sel", ccm(CCM_MCR), 15, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
+       clk[per0] = imx_clk_divider("per0", "per0_sel", ccm(CCM_PCDR0), 0, 6);
+       clk[per1] = imx_clk_divider("per1", "per1_sel", ccm(CCM_PCDR0), 8, 6);
+       clk[per2] = imx_clk_divider("per2", "per2_sel", ccm(CCM_PCDR0), 16, 6);
+       clk[per3] = imx_clk_divider("per3", "per3_sel", ccm(CCM_PCDR0), 24, 6);
+       clk[per4] = imx_clk_divider("per4", "per4_sel", ccm(CCM_PCDR1), 0, 6);
+       clk[per5] = imx_clk_divider("per5", "per5_sel", ccm(CCM_PCDR1), 8, 6);
+       clk[per6] = imx_clk_divider("per6", "per6_sel", ccm(CCM_PCDR1), 16, 6);
+       clk[per7] = imx_clk_divider("per7", "per7_sel", ccm(CCM_PCDR1), 24, 6);
+       clk[per8] = imx_clk_divider("per8", "per8_sel", ccm(CCM_PCDR2), 0, 6);
+       clk[per9] = imx_clk_divider("per9", "per9_sel", ccm(CCM_PCDR2), 8, 6);
+       clk[per10] = imx_clk_divider("per10", "per10_sel", ccm(CCM_PCDR2), 16, 6);
+       clk[per11] = imx_clk_divider("per11", "per11_sel", ccm(CCM_PCDR2), 24, 6);
+       clk[per12] = imx_clk_divider("per12", "per12_sel", ccm(CCM_PCDR3), 0, 6);
+       clk[per13] = imx_clk_divider("per13", "per13_sel", ccm(CCM_PCDR3), 8, 6);
+       clk[per14] = imx_clk_divider("per14", "per14_sel", ccm(CCM_PCDR3), 16, 6);
+       clk[per15] = imx_clk_divider("per15", "per15_sel", ccm(CCM_PCDR3), 24, 6);
+       clk[csi_ipg_per] = imx_clk_gate("csi_ipg_per", "per0", ccm(CCM_CGCR0), 0);
+       clk[esdhc1_ipg_per] = imx_clk_gate("esdhc1_ipg_per", "per3", ccm(CCM_CGCR0),  3);
+       clk[esdhc2_ipg_per] = imx_clk_gate("esdhc2_ipg_per", "per4", ccm(CCM_CGCR0),  4);
+       clk[gpt_ipg_per] = imx_clk_gate("gpt_ipg_per", "per5", ccm(CCM_CGCR0),  5);
+       clk[i2c_ipg_per] = imx_clk_gate("i2c_ipg_per", "per6", ccm(CCM_CGCR0),  6);
+       clk[lcdc_ipg_per] = imx_clk_gate("lcdc_ipg_per", "per8", ccm(CCM_CGCR0),  7);
+       clk[nfc_ipg_per] = imx_clk_gate("nfc_ipg_per", "ipg_per", ccm(CCM_CGCR0),  8);
+       clk[ssi1_ipg_per] = imx_clk_gate("ssi1_ipg_per", "per13", ccm(CCM_CGCR0), 13);
+       clk[ssi2_ipg_per] = imx_clk_gate("ssi2_ipg_per", "per14", ccm(CCM_CGCR0), 14);
+       clk[uart_ipg_per] = imx_clk_gate("uart_ipg_per", "per15", ccm(CCM_CGCR0), 15);
+       clk[csi_ahb] = imx_clk_gate("csi_ahb", "ahb", ccm(CCM_CGCR0), 18);
+       clk[esdhc1_ahb] = imx_clk_gate("esdhc1_ahb", "ahb", ccm(CCM_CGCR0), 21);
+       clk[esdhc2_ahb] = imx_clk_gate("esdhc2_ahb", "ahb", ccm(CCM_CGCR0), 22);
+       clk[fec_ahb] = imx_clk_gate("fec_ahb", "ahb", ccm(CCM_CGCR0), 23);
+       clk[lcdc_ahb] = imx_clk_gate("lcdc_ahb", "ahb", ccm(CCM_CGCR0), 24);
+       clk[sdma_ahb] = imx_clk_gate("sdma_ahb", "ahb", ccm(CCM_CGCR0), 26);
+       clk[usbotg_ahb] = imx_clk_gate("usbotg_ahb", "ahb", ccm(CCM_CGCR0), 28);
+       clk[can1_ipg] = imx_clk_gate("can1_ipg", "ipg", ccm(CCM_CGCR1),  2);
+       clk[can2_ipg] = imx_clk_gate("can2_ipg", "ipg", ccm(CCM_CGCR1),  3);
+       clk[csi_ipg] = imx_clk_gate("csi_ipg", "ipg", ccm(CCM_CGCR1),  4);
+       clk[cspi1_ipg] = imx_clk_gate("cspi1_ipg", "ipg", ccm(CCM_CGCR1),  5);
+       clk[cspi2_ipg] = imx_clk_gate("cspi2_ipg", "ipg", ccm(CCM_CGCR1),  6);
+       clk[cspi3_ipg] = imx_clk_gate("cspi3_ipg", "ipg", ccm(CCM_CGCR1),  7);
+       clk[dryice_ipg] = imx_clk_gate("dryice_ipg", "ipg", ccm(CCM_CGCR1),  8);
+       clk[esdhc1_ipg] = imx_clk_gate("esdhc1_ipg", "ipg", ccm(CCM_CGCR1), 13);
+       clk[esdhc2_ipg] = imx_clk_gate("esdhc2_ipg", "ipg", ccm(CCM_CGCR1), 14);
+       clk[fec_ipg] = imx_clk_gate("fec_ipg", "ipg", ccm(CCM_CGCR1), 15);
+       clk[iim_ipg] = imx_clk_gate("iim_ipg", "ipg", ccm(CCM_CGCR1), 26);
+       clk[kpp_ipg] = imx_clk_gate("kpp_ipg", "ipg", ccm(CCM_CGCR1), 28);
+       clk[lcdc_ipg] = imx_clk_gate("lcdc_ipg", "ipg", ccm(CCM_CGCR1), 29);
+       clk[pwm1_ipg] = imx_clk_gate("pwm1_ipg", "ipg", ccm(CCM_CGCR1), 31);
+       clk[pwm2_ipg] = imx_clk_gate("pwm2_ipg", "ipg", ccm(CCM_CGCR2),  0);
+       clk[pwm3_ipg] = imx_clk_gate("pwm3_ipg", "ipg", ccm(CCM_CGCR2),  1);
+       clk[pwm4_ipg] = imx_clk_gate("pwm4_ipg", "ipg", ccm(CCM_CGCR2),  2);
+       clk[sdma_ipg] = imx_clk_gate("sdma_ipg", "ipg", ccm(CCM_CGCR2),  6);
+       clk[ssi1_ipg] = imx_clk_gate("ssi1_ipg", "ipg", ccm(CCM_CGCR2), 11);
+       clk[ssi2_ipg] = imx_clk_gate("ssi2_ipg", "ipg", ccm(CCM_CGCR2), 12);
+       clk[tsc_ipg] = imx_clk_gate("tsc_ipg", "ipg", ccm(CCM_CGCR2), 13);
+       clk[uart1_ipg] = imx_clk_gate("uart1_ipg", "ipg", ccm(CCM_CGCR2), 14);
+       clk[uart2_ipg] = imx_clk_gate("uart2_ipg", "ipg", ccm(CCM_CGCR2), 15);
+       clk[uart3_ipg] = imx_clk_gate("uart3_ipg", "ipg", ccm(CCM_CGCR2), 16);
+       clk[uart4_ipg] = imx_clk_gate("uart4_ipg", "ipg", ccm(CCM_CGCR2), 17);
+       clk[uart5_ipg] = imx_clk_gate("uart5_ipg", "ipg", ccm(CCM_CGCR2), 18);
+       clk[wdt_ipg] = imx_clk_gate("wdt_ipg", "ipg", ccm(CCM_CGCR2), 19);
+
+       for (i = 0; i < ARRAY_SIZE(clk); i++)
+               if (IS_ERR(clk[i]))
+                       pr_err("i.MX25 clk %d: register failed with %ld\n",
+                               i, PTR_ERR(clk[i]));
+
+       /* i.mx25 has the i.mx21 type uart */
+       clk_register_clkdev(clk[uart1_ipg], "ipg", "imx21-uart.0");
+       clk_register_clkdev(clk[uart_ipg_per], "per", "imx21-uart.0");
+       clk_register_clkdev(clk[uart2_ipg], "ipg", "imx21-uart.1");
+       clk_register_clkdev(clk[uart_ipg_per], "per", "imx21-uart.1");
+       clk_register_clkdev(clk[uart3_ipg], "ipg", "imx21-uart.2");
+       clk_register_clkdev(clk[uart_ipg_per], "per", "imx21-uart.2");
+       clk_register_clkdev(clk[uart4_ipg], "ipg", "imx21-uart.3");
+       clk_register_clkdev(clk[uart_ipg_per], "per", "imx21-uart.3");
+       clk_register_clkdev(clk[uart5_ipg], "ipg", "imx21-uart.4");
+       clk_register_clkdev(clk[uart_ipg_per], "per", "imx21-uart.4");
+       clk_register_clkdev(clk[ipg], "ipg", "imx-gpt.0");
+       clk_register_clkdev(clk[gpt_ipg_per], "per", "imx-gpt.0");
+       clk_register_clkdev(clk[ipg], "ipg", "mxc-ehci.0");
+       clk_register_clkdev(clk[usbotg_ahb], "ahb", "mxc-ehci.0");
+       clk_register_clkdev(clk[usb_div], "per", "mxc-ehci.0");
+       clk_register_clkdev(clk[ipg], "ipg", "mxc-ehci.1");
+       clk_register_clkdev(clk[usbotg_ahb], "ahb", "mxc-ehci.1");
+       clk_register_clkdev(clk[usb_div], "per", "mxc-ehci.1");
+       clk_register_clkdev(clk[ipg], "ipg", "mxc-ehci.2");
+       clk_register_clkdev(clk[usbotg_ahb], "ahb", "mxc-ehci.2");
+       clk_register_clkdev(clk[usb_div], "per", "mxc-ehci.2");
+       clk_register_clkdev(clk[ipg], "ipg", "fsl-usb2-udc");
+       clk_register_clkdev(clk[usbotg_ahb], "ahb", "fsl-usb2-udc");
+       clk_register_clkdev(clk[usb_div], "per", "fsl-usb2-udc");
+       clk_register_clkdev(clk[nfc_ipg_per], NULL, "mxc_nand.0");
+       /* i.mx25 has the i.mx35 type cspi */
+       clk_register_clkdev(clk[cspi1_ipg], NULL, "imx35-cspi.0");
+       clk_register_clkdev(clk[cspi2_ipg], NULL, "imx35-cspi.1");
+       clk_register_clkdev(clk[cspi3_ipg], NULL, "imx35-cspi.2");
+       clk_register_clkdev(clk[pwm1_ipg], "ipg", "mxc_pwm.0");
+       clk_register_clkdev(clk[per10], "per", "mxc_pwm.0");
+       clk_register_clkdev(clk[pwm1_ipg], "ipg", "mxc_pwm.1");
+       clk_register_clkdev(clk[per10], "per", "mxc_pwm.1");
+       clk_register_clkdev(clk[pwm1_ipg], "ipg", "mxc_pwm.2");
+       clk_register_clkdev(clk[per10], "per", "mxc_pwm.2");
+       clk_register_clkdev(clk[pwm1_ipg], "ipg", "mxc_pwm.3");
+       clk_register_clkdev(clk[per10], "per", "mxc_pwm.3");
+       clk_register_clkdev(clk[kpp_ipg], NULL, "imx-keypad");
+       clk_register_clkdev(clk[tsc_ipg], NULL, "mx25-adc");
+       clk_register_clkdev(clk[i2c_ipg_per], NULL, "imx-i2c.0");
+       clk_register_clkdev(clk[i2c_ipg_per], NULL, "imx-i2c.1");
+       clk_register_clkdev(clk[i2c_ipg_per], NULL, "imx-i2c.2");
+       clk_register_clkdev(clk[fec_ipg], "ipg", "imx25-fec.0");
+       clk_register_clkdev(clk[fec_ahb], "ahb", "imx25-fec.0");
+       clk_register_clkdev(clk[dryice_ipg], NULL, "imxdi_rtc.0");
+       clk_register_clkdev(clk[lcdc_ipg_per], "per", "imx-fb.0");
+       clk_register_clkdev(clk[lcdc_ipg], "ipg", "imx-fb.0");
+       clk_register_clkdev(clk[lcdc_ahb], "ahb", "imx-fb.0");
+       clk_register_clkdev(clk[wdt_ipg], NULL, "imx2-wdt.0");
+       clk_register_clkdev(clk[ssi1_ipg_per], "per", "imx-ssi.0");
+       clk_register_clkdev(clk[ssi1_ipg], "ipg", "imx-ssi.0");
+       clk_register_clkdev(clk[ssi2_ipg_per], "per", "imx-ssi.1");
+       clk_register_clkdev(clk[ssi2_ipg], "ipg", "imx-ssi.1");
+       clk_register_clkdev(clk[esdhc1_ipg_per], "per", "sdhci-esdhc-imx25.0");
+       clk_register_clkdev(clk[esdhc1_ipg], "ipg", "sdhci-esdhc-imx25.0");
+       clk_register_clkdev(clk[esdhc1_ahb], "ahb", "sdhci-esdhc-imx25.0");
+       clk_register_clkdev(clk[esdhc2_ipg_per], "per", "sdhci-esdhc-imx25.1");
+       clk_register_clkdev(clk[esdhc2_ipg], "ipg", "sdhci-esdhc-imx25.1");
+       clk_register_clkdev(clk[esdhc2_ahb], "ahb", "sdhci-esdhc-imx25.1");
+       clk_register_clkdev(clk[csi_ipg_per], "per", "mx2-camera.0");
+       clk_register_clkdev(clk[csi_ipg], "ipg", "mx2-camera.0");
+       clk_register_clkdev(clk[csi_ahb], "ahb", "mx2-camera.0");
+       clk_register_clkdev(clk[dummy], "audmux", NULL);
+       clk_register_clkdev(clk[can1_ipg], NULL, "flexcan.0");
+       clk_register_clkdev(clk[can2_ipg], NULL, "flexcan.1");
+       /* i.mx25 has the i.mx35 type sdma */
+       clk_register_clkdev(clk[sdma_ipg], "ipg", "imx35-sdma");
+       clk_register_clkdev(clk[sdma_ahb], "ahb", "imx35-sdma");
+       clk_register_clkdev(clk[iim_ipg], "iim", NULL);
+
+       mxc_timer_init(NULL, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54);
+       return 0;
+}