Blackfin arch: fix bugs and unify BFIN_KERNEL_CLOCK option
- remove duplicated code and headers
- add option allowing arbitrary SDRAM/DDR Timing parameters.
- mark automatically calculated timings as EXPERIMENTAL
- fix comment header block
Related to BUGs:
- kernel boot up fails with CONFIG_BFIN_KERNEL_CLOCK item on.
- kernel does not boot if re-program clocks
[ Mike Frysinger <vapier.adi@gmail.com>
- fix comment header
- mark do_sync static
- document the DMA shutdown
- simplify SIC_IWR handling
- fix ANOMALY_05000265 handling to work as intended ]
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
diff --git a/arch/blackfin/mach-common/clocks-init.c b/arch/blackfin/mach-common/clocks-init.c
new file mode 100644
index 0000000..39a94b3
--- /dev/null
+++ b/arch/blackfin/mach-common/clocks-init.c
@@ -0,0 +1,93 @@
+/*
+ * arch/blackfin/mach-common/clocks-init.c - reprogram clocks / memory
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/blackfin.h>
+
+#include <asm/dma.h>
+#include <asm/clocks.h>
+#include <asm/mem_init.h>
+
+#define PLL_CTL_VAL \
+ (((CONFIG_VCO_MULT & 63) << 9) | CLKIN_HALF | \
+ (PLL_BYPASS << 8) | (ANOMALY_05000265 ? 0x8000 : 0))
+
+__attribute__((l1_text))
+static void do_sync(void)
+{
+ __builtin_bfin_ssync();
+}
+
+__attribute__((l1_text))
+void init_clocks(void)
+{
+ /* Kill any active DMAs as they may trigger external memory accesses
+ * in the middle of reprogramming things, and that'll screw us up.
+ * For example, any automatic DMAs left by U-Boot for splash screens.
+ */
+ size_t i;
+ for (i = 0; i < MAX_BLACKFIN_DMA_CHANNEL; ++i) {
+ struct dma_register *dma = dma_io_base_addr[i];
+ dma->cfg = 0;
+ }
+
+ do_sync();
+
+#ifdef SIC_IWR0
+ bfin_write_SIC_IWR0(IWR_ENABLE(0));
+# ifdef SIC_IWR1
+ /* BF52x system reset does not properly reset SIC_IWR1 which
+ * will screw up the bootrom as it relies on MDMA0/1 waking it
+ * up from IDLE instructions. See this report for more info:
+ * http://blackfin.uclinux.org/gf/tracker/4323
+ */
+ if (ANOMALY_05000435)
+ bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
+ else
+ bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
+# endif
+# ifdef SIC_IWR2
+ bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
+# endif
+#else
+ bfin_write_SIC_IWR(IWR_ENABLE(0));
+#endif
+ do_sync();
+#ifdef EBIU_SDGCTL
+ bfin_write_EBIU_SDGCTL(bfin_read_EBIU_SDGCTL() | SRFS);
+ do_sync();
+#endif
+
+#ifdef CLKBUFOE
+ bfin_write16(VR_CTL, bfin_read_VR_CTL() | CLKBUFOE);
+ do_sync();
+ __asm__ __volatile__("IDLE;");
+#endif
+ bfin_write_PLL_LOCKCNT(0x300);
+ do_sync();
+ bfin_write16(PLL_CTL, PLL_CTL_VAL);
+ __asm__ __volatile__("IDLE;");
+ bfin_write_PLL_DIV(CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
+#ifdef EBIU_SDGCTL
+ bfin_write_EBIU_SDRRC(mem_SDRRC);
+ bfin_write_EBIU_SDGCTL(mem_SDGCTL);
+#else
+ bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() & ~(SRREQ));
+ do_sync();
+ bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() | 0x1);
+ bfin_write_EBIU_DDRCTL0(mem_DDRCTL0);
+ bfin_write_EBIU_DDRCTL1(mem_DDRCTL1);
+ bfin_write_EBIU_DDRCTL2(mem_DDRCTL2);
+#ifdef CONFIG_MEM_EBIU_DDRQUE
+ bfin_write_EBIU_DDRQUE(CONFIG_MEM_EBIU_DDRQUE);
+#endif
+#endif
+ do_sync();
+ bfin_read16(0);
+}