--- /dev/null
+/*
+ * Support functions for OMAP3 SDTI (Serial Debug Tracing Interface)
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ * Written by: Roman Tereshonkov <roman.tereshonkov@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <mach/sti.h>
+#include <asm/byteorder.h>
+#include <asm/io.h>
+
+#define SDTI_REVISION 0x000
+#define SDTI_SYSCONFIG 0x010
+#define SDTI_SYSSTATUS 0x014
+#define SDTI_WINCTRL 0x024
+#define SDTI_SCONFIG 0x028
+#define SDTI_TESTCTRL 0x02C
+#define SDTI_LOCK_ACCESS 0xFB0
+
+#define CPU1_TRACE_EN 0x01
+#define CPU2_TRACE_EN 0x02
+
+#define SDTI_SYSCONFIG_SOFTRESET (1 << 1)
+#define SDTI_SYSCONFIG_AUTOIDLE (1 << 0)
+
+static struct clk *sdti_fck, *sdti_ick;
+void __iomem *sti_base, *sti_channel_base;
+static DEFINE_SPINLOCK(sdti_lock);
+static int sdti_initialized;
+
+void sti_channel_write_trace(int len, int id, void *data,
+ unsigned int channel)
+{
+ const u8 *tpntr = data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sdti_lock, flags);
+
+ if (unlikely(!sdti_initialized))
+ goto skip;
+
+ sti_channel_writeb(id, channel);
+ while (len--)
+ sti_channel_writeb(*tpntr++, channel);
+ sti_channel_flush(channel);
+ skip:
+ spin_unlock_irqrestore(&sdti_lock, flags);
+}
+EXPORT_SYMBOL(sti_channel_write_trace);
+
+static void omap_sdti_reset(void)
+{
+ int i;
+
+ sti_writel(SDTI_SYSCONFIG_SOFTRESET, SDTI_SYSCONFIG);
+
+ for (i = 0; i < 10000; i++)
+ if (sti_readl(SDTI_SYSSTATUS) & 1)
+ break;
+ if (i == 10000)
+ printk(KERN_WARNING "XTI: no real reset\n");
+}
+
+static int __init omap_sdti_init(void)
+{
+ char buf[64];
+ int i, ret = 0;
+
+ sdti_fck = clk_get(NULL, "pclk_fck");
+ if (IS_ERR(sdti_fck)) {
+ printk(KERN_ERR "Cannot get clk pclk_fck\n");
+ ret = PTR_ERR(sdti_fck);
+ goto err0;
+ }
+ sdti_ick = clk_get(NULL, "pclkx2_fck");
+ if (IS_ERR(sdti_ick)) {
+ printk(KERN_ERR "Cannot get clk pclkx2_fck\n");
+ ret = PTR_ERR(sdti_ick);
+ goto err1;
+ }
+ ret = clk_enable(sdti_fck);
+ if (ret) {
+ printk(KERN_ERR "Cannot enable sdti_fck\n");
+ goto err2;
+ }
+ ret = clk_enable(sdti_ick);
+ if (ret) {
+ printk(KERN_ERR "Cannot enable sdti_ick\n");
+ goto err3;
+ }
+
+ omap_sdti_reset();
+ sti_writel(0xC5ACCE55, SDTI_LOCK_ACCESS);
+
+ /* Autoidle */
+ sti_writel(SDTI_SYSCONFIG_AUTOIDLE, SDTI_SYSCONFIG);
+
+ /* Claim SDTI */
+ sti_writel(1 << 30, SDTI_WINCTRL);
+ i = sti_readl(SDTI_WINCTRL);
+ if (!(i & (1 << 30)))
+ printk(KERN_WARNING "SDTI: cannot claim SDTI\n");
+
+ /* 4 bits dual, fclk/3 */
+ sti_writel(0x43, SDTI_SCONFIG);
+
+ /* CPU2 trace enable */
+ sti_writel(i | CPU2_TRACE_EN, SDTI_WINCTRL);
+ i = sti_readl(SDTI_WINCTRL);
+
+ /* Enable SDTI */
+ sti_writel((1 << 31) | (i & 0x3FFFFFFF), SDTI_WINCTRL);
+
+ spin_lock_irq(&sdti_lock);
+ sdti_initialized = 1;
+ spin_unlock_irq(&sdti_lock);
+
+ i = sti_readl(SDTI_REVISION);
+ snprintf(buf, sizeof(buf), "OMAP SDTI support loaded (HW v%u.%u)\n",
+ (i >> 4) & 0x0f, i & 0x0f);
+ printk(KERN_INFO "%s", buf);
+ sti_channel_write_trace(strlen(buf), 0xc3, buf, 239);
+
+ return ret;
+
+err3:
+ clk_disable(sdti_fck);
+err2:
+ clk_put(sdti_ick);
+err1:
+ clk_put(sdti_fck);
+err0:
+ return ret;
+}
+
+static void omap_sdti_exit(void)
+{
+ sti_writel(0, SDTI_WINCTRL);
+ clk_disable(sdti_fck);
+ clk_disable(sdti_ick);
+ clk_put(sdti_fck);
+ clk_put(sdti_ick);
+}
+
+static int __devinit omap_sdti_probe(struct platform_device *pdev)
+{
+ struct resource *res, *cres;
+ unsigned int size;
+
+ if (pdev->num_resources != 2) {
+ dev_err(&pdev->dev, "invalid number of resources: %d\n",
+ pdev->num_resources);
+ return -ENODEV;
+ }
+
+ /* SDTI base */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (unlikely(!res)) {
+ dev_err(&pdev->dev, "invalid mem resource\n");
+ return -ENODEV;
+ }
+
+ /* Channel base */
+ cres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (unlikely(!cres)) {
+ dev_err(&pdev->dev, "invalid channel mem resource\n");
+ return -ENODEV;
+ }
+
+ size = res->end - res->start;
+ sti_base = ioremap(res->start, size);
+ if (unlikely(!sti_base))
+ return -ENODEV;
+
+ size = cres->end - cres->start;
+ sti_channel_base = ioremap(cres->start, size);
+ if (unlikely(!sti_channel_base)) {
+ iounmap(sti_base);
+ return -ENODEV;
+ }
+
+ return omap_sdti_init();
+}
+
+static int __devexit omap_sdti_remove(struct platform_device *pdev)
+{
+ iounmap(sti_channel_base);
+ iounmap(sti_base);
+ omap_sdti_exit();
+
+ return 0;
+}
+
+static struct platform_driver omap_sdti_driver = {
+ .probe = omap_sdti_probe,
+ .remove = __devexit_p(omap_sdti_remove),
+ .driver = {
+ .name = "sti",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init omap_sdti_module_init(void)
+{
+ return platform_driver_register(&omap_sdti_driver);
+}
+
+static void __exit omap_sdti_module_exit(void)
+{
+ platform_driver_unregister(&omap_sdti_driver);
+}
+subsys_initcall(omap_sdti_module_init);
+module_exit(omap_sdti_module_exit);
+
+MODULE_AUTHOR("Roman Tereshonkov");
+MODULE_LICENSE("GPL");
projects / linux-2.6-omap-h63xx.git / blobdiff