[AVR32] Add basic HMATRIX support

This adds register and clock definitions for the High-speed bus Matrix
(HMATRIX) as well as a function that can be used to configure special
EBI functionality like CompactFlash and NAND flash support.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/avr32/mach-at32ap/at32ap7000.c b/arch/avr32/mach-at32ap/at32ap7000.c
index 472703f90c22..32c7045141c2 100644
--- a/arch/avr32/mach-at32ap/at32ap7000.c
+++ b/arch/avr32/mach-at32ap/at32ap7000.c
@@ -18,6 +18,7 @@
 #include <asm/arch/sm.h>
 
 #include "clock.h"
+#include "hmatrix.h"
 #include "pio.h"
 #include "sm.h"
 
@@ -467,6 +468,42 @@ static struct clk pico_clk = {
 };
 
 /* --------------------------------------------------------------------
+ * HMATRIX
+ * -------------------------------------------------------------------- */
+
+static struct clk hmatrix_clk = {
+        .name           = "hmatrix_clk",
+        .parent         = &pbb_clk,
+        .mode           = pbb_clk_mode,
+        .get_rate       = pbb_clk_get_rate,
+        .index          = 2,
+        .users          = 1,
+};
+#define HMATRIX_BASE    ((void __iomem *)0xfff00800)
+
+#define hmatrix_readl(reg)                                      \
+        __raw_readl((HMATRIX_BASE) + HMATRIX_##reg)
+#define hmatrix_writel(reg,value)                               \
+        __raw_writel((value), (HMATRIX_BASE) + HMATRIX_##reg)
+
+/*
+ * Set bits in the HMATRIX Special Function Register (SFR) used by the
+ * External Bus Interface (EBI). This can be used to enable special
+ * features like CompactFlash support, NAND Flash support, etc. on
+ * certain chipselects.
+ */
+static inline void set_ebi_sfr_bits(u32 mask)
+{
+        u32 sfr;
+
+        clk_enable(&hmatrix_clk);
+        sfr = hmatrix_readl(SFR4);
+        sfr |= mask;
+        hmatrix_writel(SFR4, sfr);
+        clk_disable(&hmatrix_clk);
+}
+
+/* --------------------------------------------------------------------
  *  PIO
  * -------------------------------------------------------------------- */
 
@@ -950,6 +987,7 @@ struct clk *at32_clock_list[] = {
         &pbb_clk,
         &at32_sm_pclk,
         &at32_intc0_pclk,
+        &hmatrix_clk,
         &ebi_clk,
         &hramc_clk,
         &smc0_pclk,