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Diffstat (limited to 'arch/mips/mach-pic32/cpu.c')
-rw-r--r--arch/mips/mach-pic32/cpu.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/arch/mips/mach-pic32/cpu.c b/arch/mips/mach-pic32/cpu.c
index 58fd3abcc2..f2ee911df4 100644
--- a/arch/mips/mach-pic32/cpu.c
+++ b/arch/mips/mach-pic32/cpu.c
@@ -6,8 +6,151 @@
*
*/
#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <mach/pic32.h>
+#include <mach/ddr.h>
+#include <dt-bindings/clock/microchip,clock.h>
+/* Flash prefetch */
+#define PRECON 0x00
+
+/* Flash ECCCON */
+#define ECC_MASK 0x03
+#define ECC_SHIFT 4
+
+#define CLK_MHZ(x) ((x) / 1000000)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static ulong clk_get_cpu_rate(void)
+{
+ int ret;
+ struct udevice *dev;
+
+ ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+ if (ret) {
+ panic("uclass-clk: device not found\n");
+ return 0;
+ }
+
+ return clk_get_rate(dev);
+}
+
+/* initialize prefetch module related to cpu_clk */
+static void prefetch_init(void)
+{
+ struct pic32_reg_atomic *regs;
+ const void __iomem *base;
+ int v, nr_waits;
+ ulong rate;
+
+ /* cpu frequency in MHZ */
+ rate = clk_get_cpu_rate() / 1000000;
+
+ /* get flash ECC type */
+ base = pic32_get_syscfg_base();
+ v = (readl(base + CFGCON) >> ECC_SHIFT) & ECC_MASK;
+
+ if (v < 2) {
+ if (rate < 66)
+ nr_waits = 0;
+ else if (rate < 133)
+ nr_waits = 1;
+ else
+ nr_waits = 2;
+ } else {
+ if (rate <= 83)
+ nr_waits = 0;
+ else if (rate <= 166)
+ nr_waits = 1;
+ else
+ nr_waits = 2;
+ }
+
+ regs = ioremap(PREFETCH_BASE + PRECON, sizeof(*regs));
+ writel(nr_waits, &regs->raw);
+
+ /* Enable prefetch for all */
+ writel(0x30, &regs->set);
+ iounmap(regs);
+}
+
+/* arch specific CPU init after DM */
+int arch_cpu_init_dm(void)
+{
+ /* flash prefetch */
+ prefetch_init();
+ return 0;
+}
+
+/* Un-gate DDR2 modules (gated by default) */
+static void ddr2_pmd_ungate(void)
+{
+ void __iomem *regs;
+
+ regs = pic32_get_syscfg_base();
+ writel(0, regs + PMD7);
+}
+
+/* initialize the DDR2 Controller and DDR2 PHY */
phys_size_t initdram(int board_type)
{
+ ddr2_pmd_ungate();
+ ddr2_phy_init();
+ ddr2_ctrl_init();
+ return ddr2_calculate_size();
+}
+
+int misc_init_r(void)
+{
+ set_io_port_base(0);
+ return 0;
+}
+
+#ifdef CONFIG_DISPLAY_BOARDINFO
+const char *get_core_name(void)
+{
+ u32 proc_id;
+ const char *str;
+
+ proc_id = read_c0_prid();
+ switch (proc_id) {
+ case 0x19e28:
+ str = "PIC32MZ[DA]";
+ break;
+ default:
+ str = "UNKNOWN";
+ }
+
+ return str;
+}
+#endif
+#ifdef CONFIG_CMD_CLK
+int soc_clk_dump(void)
+{
+ int i, ret;
+ struct udevice *dev;
+
+ ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+ if (ret) {
+ printf("clk-uclass not found\n");
+ return ret;
+ }
+
+ printf("PLL Speed: %lu MHz\n",
+ CLK_MHZ(clk_get_periph_rate(dev, PLLCLK)));
+ printf("CPU Speed: %lu MHz\n", CLK_MHZ(clk_get_rate(dev)));
+ printf("MPLL Speed: %lu MHz\n",
+ CLK_MHZ(clk_get_periph_rate(dev, MPLL)));
+
+ for (i = PB1CLK; i <= PB7CLK; i++)
+ printf("PB%d Clock Speed: %lu MHz\n", i - PB1CLK + 1,
+ CLK_MHZ(clk_get_periph_rate(dev, i)));
+
+ for (i = REF1CLK; i <= REF5CLK; i++)
+ printf("REFO%d Clock Speed: %lu MHz\n", i - REF1CLK + 1,
+ CLK_MHZ(clk_get_periph_rate(dev, i)));
return 0;
}
+#endif