spi/pxa2xx: Add CE4100 support

Sodaville's SPI controller is very much the same as in PXA25x. The
difference:
- The RX/TX FIFO is only 4 words deep instead of 16
- No DMA support
- The SPI controller offers a CS functionality

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>

1 files changed, 104 insertions, 1 deletions

diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h
index 471ed688911..d3e1075f7b6 100644
--- a/include/linux/spi/pxa2xx_spi.h
+++ b/include/linux/spi/pxa2xx_spi.h
@@ -19,7 +19,6 @@
 #define __linux_pxa2xx_spi_h
 
 #include <linux/pxa2xx_ssp.h>
-#include <mach/dma.h>
 
 #define PXA2XX_CS_ASSERT (0x01)
 #define PXA2XX_CS_DEASSERT (0x02)
@@ -44,6 +43,110 @@ struct pxa2xx_spi_chip {
         void (*cs_control)(u32 command);
 };
 
+#ifdef CONFIG_ARCH_PXA
+
+#include <linux/clk.h>
+#include <mach/dma.h>
+
 extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_master *info);
 
+#else
+/*
+ * This is the implemtation for CE4100 on x86. ARM defines them in mach/ or
+ * plat/ include path.
+ * The CE4100 does not provide DMA support. This bits are here to let the driver
+ * compile and will never be used. Maybe we get DMA support at a later point in
+ * time.
+ */
+
+#define DCSR(n)         (n)
+#define DSADR(n)        (n)
+#define DTADR(n)        (n)
+#define DCMD(n)         (n)
+#define DRCMR(n)        (n)
+
+#define DCSR_RUN        (1 << 31)       /* Run Bit */
+#define DCSR_NODESC     (1 << 30)       /* No-Descriptor Fetch */
+#define DCSR_STOPIRQEN  (1 << 29)       /* Stop Interrupt Enable */
+#define DCSR_REQPEND    (1 << 8)        /* Request Pending (read-only) */
+#define DCSR_STOPSTATE  (1 << 3)        /* Stop State (read-only) */
+#define DCSR_ENDINTR    (1 << 2)        /* End Interrupt */
+#define DCSR_STARTINTR  (1 << 1)        /* Start Interrupt */
+#define DCSR_BUSERR     (1 << 0)        /* Bus Error Interrupt */
+
+#define DCSR_EORIRQEN   (1 << 28)       /* End of Receive Interrupt Enable */
+#define DCSR_EORJMPEN   (1 << 27)       /* Jump to next descriptor on EOR */
+#define DCSR_EORSTOPEN  (1 << 26)       /* STOP on an EOR */
+#define DCSR_SETCMPST   (1 << 25)       /* Set Descriptor Compare Status */
+#define DCSR_CLRCMPST   (1 << 24)       /* Clear Descriptor Compare Status */
+#define DCSR_CMPST      (1 << 10)       /* The Descriptor Compare Status */
+#define DCSR_EORINTR    (1 << 9)        /* The end of Receive */
+
+#define DRCMR_MAPVLD    (1 << 7)        /* Map Valid */
+#define DRCMR_CHLNUM    0x1f            /* mask for Channel Number */
+
+#define DDADR_DESCADDR  0xfffffff0      /* Address of next descriptor */
+#define DDADR_STOP      (1 << 0)        /* Stop */
+
+#define DCMD_INCSRCADDR (1 << 31)       /* Source Address Increment Setting. */
+#define DCMD_INCTRGADDR (1 << 30)       /* Target Address Increment Setting. */
+#define DCMD_FLOWSRC    (1 << 29)       /* Flow Control by the source. */
+#define DCMD_FLOWTRG    (1 << 28)       /* Flow Control by the target. */
+#define DCMD_STARTIRQEN (1 << 22)       /* Start Interrupt Enable */
+#define DCMD_ENDIRQEN   (1 << 21)       /* End Interrupt Enable */
+#define DCMD_ENDIAN     (1 << 18)       /* Device Endian-ness. */
+#define DCMD_BURST8     (1 << 16)       /* 8 byte burst */
+#define DCMD_BURST16    (2 << 16)       /* 16 byte burst */
+#define DCMD_BURST32    (3 << 16)       /* 32 byte burst */
+#define DCMD_WIDTH1     (1 << 14)       /* 1 byte width */
+#define DCMD_WIDTH2     (2 << 14)       /* 2 byte width (HalfWord) */
+#define DCMD_WIDTH4     (3 << 14)       /* 4 byte width (Word) */
+#define DCMD_LENGTH     0x01fff         /* length mask (max = 8K - 1) */
+
+/*
+ * Descriptor structure for PXA's DMA engine
+ * Note: this structure must always be aligned to a 16-byte boundary.
+ */
+
+typedef enum {
+        DMA_PRIO_HIGH = 0,
+        DMA_PRIO_MEDIUM = 1,
+        DMA_PRIO_LOW = 2
+} pxa_dma_prio;
+
+/*
+ * DMA registration
+ */
+
+static inline int pxa_request_dma(char *name,
+                pxa_dma_prio prio,
+                void (*irq_handler)(int, void *),
+                void *data)
+{
+        return -ENODEV;
+}
+
+static inline void pxa_free_dma(int dma_ch)
+{
+}
+
+/*
+ * The CE4100 does not have the clk framework implemented and SPI clock can
+ * not be switched on/off or the divider changed.
+ */
+static inline void clk_disable(struct clk *clk)
+{
+}
+
+static inline int clk_enable(struct clk *clk)
+{
+        return 0;
+}
+
+static inline unsigned long clk_get_rate(struct clk *clk)
+{
+        return 3686400;
+}
+
+#endif
 #endif