2 * Support functions for OMAP3 SDTI (Serial Debug Tracing Interface)
4 * Copyright (C) 2008 Nokia Corporation
5 * Written by: Roman Tereshonkov <roman.tereshonkov@nokia.com>
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/spinlock.h>
16 #include <linux/interrupt.h>
17 #include <linux/platform_device.h>
18 #include <linux/clk.h>
20 #include <asm/byteorder.h>
23 #define SDTI_REVISION 0x000
24 #define SDTI_SYSCONFIG 0x010
25 #define SDTI_SYSSTATUS 0x014
26 #define SDTI_WINCTRL 0x024
27 #define SDTI_SCONFIG 0x028
28 #define SDTI_TESTCTRL 0x02C
29 #define SDTI_LOCK_ACCESS 0xFB0
31 #define CPU1_TRACE_EN 0x01
32 #define CPU2_TRACE_EN 0x02
34 #define SDTI_SYSCONFIG_SOFTRESET (1 << 1)
35 #define SDTI_SYSCONFIG_AUTOIDLE (1 << 0)
37 static struct clk *sdti_fck, *sdti_ick;
38 void __iomem *sti_base, *sti_channel_base;
39 static DEFINE_SPINLOCK(sdti_lock);
41 void sti_channel_write_trace(int len, int id, void *data,
44 const u8 *tpntr = data;
46 spin_lock_irq(&sdti_lock);
48 sti_channel_writeb(id, channel);
50 sti_channel_writeb(*tpntr++, channel);
51 sti_channel_flush(channel);
53 spin_unlock_irq(&sdti_lock);
55 EXPORT_SYMBOL(sti_channel_write_trace);
57 static void omap_sdti_reset(void)
61 sti_writel(SDTI_SYSCONFIG_SOFTRESET, SDTI_SYSCONFIG);
63 for (i = 0; i < 10000; i++)
64 if (sti_readl(SDTI_SYSSTATUS) & 1)
67 printk(KERN_WARNING "XTI: no real reset\n");
70 static int __init omap_sdti_init(void)
75 sdti_fck = clk_get(NULL, "pclk_fck");
76 if (IS_ERR(sdti_fck)) {
77 printk(KERN_ERR "Cannot get clk pclk_fck\n");
78 ret = PTR_ERR(sdti_fck);
81 sdti_ick = clk_get(NULL, "pclkx2_fck");
82 if (IS_ERR(sdti_ick)) {
83 printk(KERN_ERR "Cannot get clk pclkx2_fck\n");
84 ret = PTR_ERR(sdti_ick);
87 ret = clk_enable(sdti_fck);
89 printk(KERN_ERR "Cannot enable sdti_fck\n");
92 ret = clk_enable(sdti_ick);
94 printk(KERN_ERR "Cannot enable sdti_ick\n");
99 sti_writel(0xC5ACCE55, SDTI_LOCK_ACCESS);
102 sti_writel(SDTI_SYSCONFIG_AUTOIDLE, SDTI_SYSCONFIG);
105 sti_writel(1 << 30, SDTI_WINCTRL);
106 i = sti_readl(SDTI_WINCTRL);
107 if (!(i & (1 << 30)))
108 printk(KERN_WARNING "SDTI: cannot claim SDTI\n");
110 /* 4 bits dual, fclk/3 */
111 sti_writel(0x43, SDTI_SCONFIG);
113 /* CPU2 trace enable */
114 sti_writel(i | CPU2_TRACE_EN, SDTI_WINCTRL);
115 i = sti_readl(SDTI_WINCTRL);
118 sti_writel((1 << 31) | (i & 0x3FFFFFFF), SDTI_WINCTRL);
120 i = sti_readl(SDTI_REVISION);
121 snprintf(buf, sizeof(buf), "OMAP SDTI support loaded (HW v%u.%u)\n",
122 (i >> 4) & 0x0f, i & 0x0f);
123 printk(KERN_INFO "%s", buf);
124 sti_channel_write_trace(strlen(buf), 0xc3, buf, 239);
129 clk_disable(sdti_fck);
138 static void omap_sdti_exit(void)
140 sti_writel(0, SDTI_WINCTRL);
141 clk_disable(sdti_fck);
142 clk_disable(sdti_ick);
147 static int __devinit omap_sdti_probe(struct platform_device *pdev)
149 struct resource *res, *cres;
152 if (pdev->num_resources != 2) {
153 dev_err(&pdev->dev, "invalid number of resources: %d\n",
154 pdev->num_resources);
159 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
160 if (unlikely(!res)) {
161 dev_err(&pdev->dev, "invalid mem resource\n");
166 cres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
167 if (unlikely(!cres)) {
168 dev_err(&pdev->dev, "invalid channel mem resource\n");
172 size = res->end - res->start;
173 sti_base = ioremap(res->start, size);
174 if (unlikely(!sti_base))
177 size = cres->end - cres->start;
178 sti_channel_base = ioremap(cres->start, size);
179 if (unlikely(!sti_channel_base)) {
184 return omap_sdti_init();
187 static int __devexit omap_sdti_remove(struct platform_device *pdev)
189 iounmap(sti_channel_base);
196 static struct platform_driver omap_sdti_driver = {
197 .probe = omap_sdti_probe,
198 .remove = __devexit_p(omap_sdti_remove),
201 .owner = THIS_MODULE,
205 static int __init omap_sdti_module_init(void)
207 return platform_driver_register(&omap_sdti_driver);
210 static void __exit omap_sdti_module_exit(void)
212 platform_driver_unregister(&omap_sdti_driver);
214 subsys_initcall(omap_sdti_module_init);
215 module_exit(omap_sdti_module_exit);
217 MODULE_AUTHOR("Roman Tereshonkov");
218 MODULE_LICENSE("GPL");