ARM: cns3xxx: Add basic support for Cavium Networks CNS3xxx processors
This patch adds very basic support for ECONA CNS3xxx ARM11 MPcore
(ARMv6) dual-core processors.
Note that SMP is not yet supported, as well as many peripheral
devices. Support for these features will be added later.
Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
diff --git a/arch/arm/mach-cns3xxx/pm.c b/arch/arm/mach-cns3xxx/pm.c
new file mode 100644
index 0000000..725e1a4
--- /dev/null
+++ b/arch/arm/mach-cns3xxx/pm.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2008 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <mach/system.h>
+#include <mach/cns3xxx.h>
+
+void cns3xxx_pwr_clk_en(unsigned int block)
+{
+ PM_CLK_GATE_REG |= (block & PM_CLK_GATE_REG_MASK);
+}
+
+void cns3xxx_pwr_power_up(unsigned int block)
+{
+ PM_PLL_HM_PD_CTRL_REG &= ~(block & CNS3XXX_PWR_PLL_ALL);
+
+ /* Wait for 300us for the PLL output clock locked. */
+ udelay(300);
+};
+
+void cns3xxx_pwr_power_down(unsigned int block)
+{
+ /* write '1' to power down */
+ PM_PLL_HM_PD_CTRL_REG |= (block & CNS3XXX_PWR_PLL_ALL);
+};
+
+static void cns3xxx_pwr_soft_rst_force(unsigned int block)
+{
+ /*
+ * bit 0, 28, 29 => program low to reset,
+ * the other else program low and then high
+ */
+ if (block & 0x30000001) {
+ PM_SOFT_RST_REG &= ~(block & PM_SOFT_RST_REG_MASK);
+ } else {
+ PM_SOFT_RST_REG &= ~(block & PM_SOFT_RST_REG_MASK);
+ PM_SOFT_RST_REG |= (block & PM_SOFT_RST_REG_MASK);
+ }
+}
+
+void cns3xxx_pwr_soft_rst(unsigned int block)
+{
+ static unsigned int soft_reset;
+
+ if (soft_reset & block) {
+ /* SPI/I2C/GPIO use the same block, reset once. */
+ return;
+ } else {
+ soft_reset |= block;
+ }
+ cns3xxx_pwr_soft_rst_force(block);
+}
+
+void arch_reset(char mode, const char *cmd)
+{
+ /*
+ * To reset, we hit the on-board reset register
+ * in the system FPGA.
+ */
+ cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(GLOBAL));
+}
+
+/*
+ * cns3xxx_cpu_clock - return CPU/L2 clock
+ * aclk: cpu clock/2
+ * hclk: cpu clock/4
+ * pclk: cpu clock/8
+ */
+int cns3xxx_cpu_clock(void)
+{
+ int cpu;
+ int cpu_sel;
+ int div_sel;
+
+ cpu_sel = (PM_CLK_CTRL_REG >> PM_CLK_CTRL_REG_OFFSET_PLL_CPU_SEL) & 0xf;
+ div_sel = (PM_CLK_CTRL_REG >> PM_CLK_CTRL_REG_OFFSET_CPU_CLK_DIV) & 0x3;
+
+ cpu = (300 + ((cpu_sel / 3) * 100) + ((cpu_sel % 3) * 33)) >> div_sel;
+
+ return cpu;
+}
