[ARM] 5477/1: Freescale STMP platform support [6/10]
Sources: common STMP3xxx platform support
Signed-off-by: dmitry pervushin <dpervushin@embeddedalley.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-stmp3xxx/core.c b/arch/arm/plat-stmp3xxx/core.c
new file mode 100644
index 0000000..6e2fef16
--- /dev/null
+++ b/arch/arm/plat-stmp3xxx/core.c
@@ -0,0 +1,127 @@
+/*
+ * Freescale STMP37XX/STMP378X core routines
+ *
+ * Embedded Alley Solutions, Inc <source@embeddedalley.com>
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <mach/stmp3xxx.h>
+#include <mach/dma.h>
+#include <mach/regs-clkctrl.h>
+
+static int __stmp3xxx_reset_block(void __iomem *hwreg, int just_enable)
+{
+ u32 c;
+ int timeout;
+
+ /* the process of software reset of IP block is done
+ in several steps:
+
+ - clear SFTRST and wait for block is enabled;
+ - clear clock gating (CLKGATE bit);
+ - set the SFTRST again and wait for block is in reset;
+ - clear SFTRST and wait for reset completion.
+ */
+ c = __raw_readl(hwreg);
+ c &= ~(1<<31); /* clear SFTRST */
+ __raw_writel(c, hwreg);
+ for (timeout = 1000000; timeout > 0; timeout--)
+ /* still in SFTRST state ? */
+ if ((__raw_readl(hwreg) & (1<<31)) == 0)
+ break;
+ if (timeout <= 0) {
+ printk(KERN_ERR"%s(%p): timeout when enabling\n",
+ __func__, hwreg);
+ return -ETIME;
+ }
+
+ c = __raw_readl(hwreg);
+ c &= ~(1<<30); /* clear CLKGATE */
+ __raw_writel(c, hwreg);
+
+ if (!just_enable) {
+ c = __raw_readl(hwreg);
+ c |= (1<<31); /* now again set SFTRST */
+ __raw_writel(c, hwreg);
+ for (timeout = 1000000; timeout > 0; timeout--)
+ /* poll until CLKGATE set */
+ if (__raw_readl(hwreg) & (1<<30))
+ break;
+ if (timeout <= 0) {
+ printk(KERN_ERR"%s(%p): timeout when resetting\n",
+ __func__, hwreg);
+ return -ETIME;
+ }
+
+ c = __raw_readl(hwreg);
+ c &= ~(1<<31); /* clear SFTRST */
+ __raw_writel(c, hwreg);
+ for (timeout = 1000000; timeout > 0; timeout--)
+ /* still in SFTRST state ? */
+ if ((__raw_readl(hwreg) & (1<<31)) == 0)
+ break;
+ if (timeout <= 0) {
+ printk(KERN_ERR"%s(%p): timeout when enabling "
+ "after reset\n", __func__, hwreg);
+ return -ETIME;
+ }
+
+ c = __raw_readl(hwreg);
+ c &= ~(1<<30); /* clear CLKGATE */
+ __raw_writel(c, hwreg);
+ }
+ for (timeout = 1000000; timeout > 0; timeout--)
+ /* still in SFTRST state ? */
+ if ((__raw_readl(hwreg) & (1<<30)) == 0)
+ break;
+
+ if (timeout <= 0) {
+ printk(KERN_ERR"%s(%p): timeout when unclockgating\n",
+ __func__, hwreg);
+ return -ETIME;
+ }
+
+ return 0;
+}
+
+int stmp3xxx_reset_block(void __iomem *hwreg, int just_enable)
+{
+ int try = 10;
+ int r;
+
+ while (try--) {
+ r = __stmp3xxx_reset_block(hwreg, just_enable);
+ if (!r)
+ break;
+ pr_debug("%s: try %d failed\n", __func__, 10 - try);
+ }
+ return r;
+}
+EXPORT_SYMBOL(stmp3xxx_reset_block);
+
+struct platform_device stmp3xxx_dbguart = {
+ .name = "stmp3xxx-dbguart",
+ .id = -1,
+};
+
+void __init stmp3xxx_init(void)
+{
+ /* Turn off auto-slow and other tricks */
+ HW_CLKCTRL_HBUS_CLR(0x07f00000U);
+
+ stmp3xxx_dma_init();
+}