[U-Boot] [PATCH 25/42] Blackfin: overhaul SPI flash handling to speed things up
Mike Frysinger
vapier at gentoo.org
Tue Feb 10 07:21:03 CET 2009
Signed-off-by: Mike Frysinger <vapier at gentoo.org>
---
board/bf537-stamp/spi_flash.c | 132 +++++++++++++++++++++++++++++++++++++++--
1 files changed, 126 insertions(+), 6 deletions(-)
diff --git a/board/bf537-stamp/spi_flash.c b/board/bf537-stamp/spi_flash.c
index a336894..214981a 100644
--- a/board/bf537-stamp/spi_flash.c
+++ b/board/bf537-stamp/spi_flash.c
@@ -18,6 +18,7 @@
#include <malloc.h>
#include <asm/io.h>
#include <asm/mach-common/bits/spi.h>
+#include <asm/mach-common/bits/dma.h>
/* Forcibly phase out these */
#ifdef CONFIG_SPI_FLASH_NUM_SECTORS
@@ -185,7 +186,7 @@ static struct manufacturer_info flash_manufacturers[] = {
},
};
-#define TIMEOUT 5000 /* timeout of 5 seconds */
+#define TIMEOUT 5000 /* timeout of 5 seconds */
/* If part has multiple SPI flashes, assume SPI0 as that is
* the one we can boot off of ...
@@ -213,6 +214,7 @@ static void SPI_INIT(void)
/* [#3541] This delay appears to be necessary, but not sure
* exactly why as the history behind it is non-existant.
*/
+ *pSPI_CTL = 0;
udelay(CONFIG_CCLK_HZ / 25000000);
/* enable SPI pins: SSEL, MOSI, MISO, SCK */
@@ -229,14 +231,13 @@ static void SPI_INIT(void)
#endif
/* initate communication upon write of TDBR */
- *pSPI_CTL = (SPE|MSTR|CPHA|CPOL|0x01);
+ *pSPI_CTL = (SPE | MSTR | CPHA | CPOL | TDBR_CORE);
*pSPI_BAUD = CONFIG_SPI_BAUD;
}
static void SPI_DEINIT(void)
{
- /* put SPI settings back to reset state */
- *pSPI_CTL = 0x0400;
+ *pSPI_CTL = 0;
*pSPI_BAUD = 0;
SSYNC();
}
@@ -622,9 +623,10 @@ static void transmit_address(uint32_t addr)
* int pnData - pointer to store value read from flash
* long lCount - number of elements to read
*/
+#ifdef CONFIG_SPI_READFLASH_NODMA
static int read_flash(unsigned long address, long count, uchar *buffer)
{
- size_t i;
+ size_t i, j;
/* Send the read command to SPI device */
SPI_ON();
@@ -638,16 +640,134 @@ static int read_flash(unsigned long address, long count, uchar *buffer)
/* After the SPI device address has been placed on the MOSI pin the data can be */
/* received on the MISO pin. */
+ j = flash.sector_size << 1;
for (i = 1; i <= count; ++i) {
*buffer++ = spi_write_read_byte(0);
- if (i % flash.sector_size == 0)
+ if (!j--) {
puts(".");
+ j = flash.sector_size;
+ }
+ }
+
+ SPI_OFF();
+
+ return 0;
+}
+#else
+
+#ifdef __ADSPBF54x__
+#define bfin_write_DMA_SPI_IRQ_STATUS bfin_write_DMA4_IRQ_STATUS
+#define bfin_read_DMA_SPI_IRQ_STATUS bfin_read_DMA4_IRQ_STATUS
+#define bfin_write_DMA_SPI_CURR_DESC_PTR bfin_write_DMA4_CURR_DESC_PTR
+#define bfin_write_DMA_SPI_CONFIG bfin_write_DMA4_CONFIG
+#elif defined(__ADSPBF533__) || defined(__ADSPBF532__) || defined(__ADSPBF531__) || \
+ defined(__ADSPBF538__) || defined(__ADSPBF539__)
+#define bfin_write_DMA_SPI_IRQ_STATUS bfin_write_DMA5_IRQ_STATUS
+#define bfin_read_DMA_SPI_IRQ_STATUS bfin_read_DMA5_IRQ_STATUS
+#define bfin_write_DMA_SPI_CURR_DESC_PTR bfin_write_DMA5_CURR_DESC_PTR
+#define bfin_write_DMA_SPI_CONFIG bfin_write_DMA5_CONFIG
+#elif defined(__ADSPBF561__)
+#define bfin_write_DMA_SPI_IRQ_STATUS bfin_write_DMA16_IRQ_STATUS
+#define bfin_read_DMA_SPI_IRQ_STATUS bfin_read_DMA16_IRQ_STATUS
+#define bfin_write_DMA_SPI_CURR_DESC_PTR bfin_write_DMA16_CURR_DESC_PTR
+#define bfin_write_DMA_SPI_CONFIG bfin_write_DMA16_CONFIG
+#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__) || \
+ defined(__ADSPBF52x__) || defined(__ADSPBF51x__)
+#define bfin_write_DMA_SPI_IRQ_STATUS bfin_write_DMA7_IRQ_STATUS
+#define bfin_read_DMA_SPI_IRQ_STATUS bfin_read_DMA7_IRQ_STATUS
+#define bfin_write_DMA_SPI_CURR_DESC_PTR bfin_write_DMA7_CURR_DESC_PTR
+#define bfin_write_DMA_SPI_CONFIG bfin_write_DMA7_CONFIG
+#else
+#error "Please provide SPI DMA channel defines"
+#endif
+
+struct dmadesc_array {
+ unsigned long start_addr;
+ unsigned short cfg;
+ unsigned short x_count;
+ short x_modify;
+ unsigned short y_count;
+ short y_modify;
+} __attribute__((packed));
+
+/*
+ * Read a value from flash for verify purpose
+ * Inputs: unsigned long ulStart - holds the SPI start address
+ * int pnData - pointer to store value read from flash
+ * long lCount - number of elements to read
+ */
+
+static int read_flash(unsigned long address, long count, uchar *buffer)
+{
+ unsigned int ndsize;
+ struct dmadesc_array dma[2];
+ /* Send the read command to SPI device */
+
+ if (!count)
+ return 0;
+
+ dma[0].start_addr = (unsigned long)buffer;
+ dma[0].x_modify = 1;
+ if (count <= 65536) {
+ blackfin_dcache_flush_invalidate_range(buffer, buffer + count);
+ ndsize = NDSIZE_5;
+ dma[0].cfg = NDSIZE_0 | WNR | WDSIZE_8 | FLOW_STOP | DMAEN | DI_EN;
+ dma[0].x_count = count;
+ } else {
+ blackfin_dcache_flush_invalidate_range(buffer, buffer + 65536 - 1);
+ ndsize = NDSIZE_7;
+ dma[0].cfg = NDSIZE_5 | WNR | WDSIZE_8 | FLOW_ARRAY | DMAEN | DMA2D;
+ dma[0].x_count = 0; /* 2^16 */
+ dma[0].y_count = count >> 16; /* count / 2^16 */
+ dma[0].y_modify = 1;
+ dma[1].start_addr = (unsigned long)(buffer + (count & ~0xFFFF));
+ dma[1].cfg = NDSIZE_0 | WNR | WDSIZE_8 | FLOW_STOP | DMAEN | DI_EN;
+ dma[1].x_count = count & 0xFFFF; /* count % 2^16 */
+ dma[1].x_modify = 1;
}
+ bfin_write_DMA_SPI_CONFIG(0);
+ bfin_write_DMA_SPI_IRQ_STATUS(DMA_DONE | DMA_ERR);
+ bfin_write_DMA_SPI_CURR_DESC_PTR(dma);
+
+ SPI_ON();
+
+ spi_write_read_byte(flash.ops->read);
+ transmit_address(address);
+
+#ifndef CONFIG_SPI_FLASH_SLOW_READ
+ /* Send dummy byte when doing SPI fast reads */
+ spi_write_read_byte(0);
+#endif
+
+ bfin_write_DMA_SPI_CONFIG(ndsize | FLOW_ARRAY | DMAEN);
+ *pSPI_CTL = (MSTR | CPHA | CPOL | RDBR_DMA | SPE | SZ);
+ SSYNC();
+
+ /*
+ * We already invalidated the first 64k,
+ * now while we just wait invalidate the remaining part.
+ * Its not likely that the DMA is going to overtake
+ */
+ if (count > 65536)
+ blackfin_dcache_flush_invalidate_range(buffer + 65536,
+ buffer + count);
+
+ while (!(bfin_read_DMA_SPI_IRQ_STATUS() & DMA_DONE))
+ if (ctrlc())
+ break;
+
SPI_OFF();
+ *pSPI_CTL = 0;
+
+ bfin_write_DMA_SPI_CONFIG(0);
+
+ *pSPI_CTL = (SPE | MSTR | CPHA | CPOL | TDBR_CORE);
+
return 0;
}
+#endif
static long address_to_sector(unsigned long address)
{
--
1.6.1.2
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