Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / mtd / spi / eeprom_m95xxx.c

diff --git a/qemu/roms/u-boot/drivers/mtd/spi/eeprom_m95xxx.c b/qemu/roms/u-boot/drivers/mtd/spi/eeprom_m95xxx.c
new file mode 100644 (file)
index 0000000..a019939
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/mtd/spi/eeprom_m95xxx.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2009
+ * Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <spi.h>
+
+#define SPI_EEPROM_WREN                0x06
+#define SPI_EEPROM_RDSR                0x05
+#define SPI_EEPROM_READ                0x03
+#define SPI_EEPROM_WRITE       0x02
+
+#ifndef CONFIG_DEFAULT_SPI_BUS
+#define CONFIG_DEFAULT_SPI_BUS 0
+#endif
+
+#ifndef CONFIG_DEFAULT_SPI_MODE
+#define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
+#endif
+
+#ifndef CONFIG_SYS_SPI_WRITE_TOUT
+#define CONFIG_SYS_SPI_WRITE_TOUT (5 * CONFIG_SYS_HZ)
+#endif
+
+ssize_t spi_read(uchar *addr, int alen, uchar *buffer, int len)
+{
+       struct spi_slave *slave;
+       u8 cmd = SPI_EEPROM_READ;
+
+       slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, 1, 1000000,
+                       CONFIG_DEFAULT_SPI_MODE);
+       if (!slave)
+               return 0;
+
+       spi_claim_bus(slave);
+
+       /* command */
+       if (spi_xfer(slave, 8, &cmd, NULL, SPI_XFER_BEGIN))
+               return -1;
+
+       /*
+        * if alen == 3, addr[0] is the block number, we never use it here.
+        * All we need are the lower 16 bits.
+        */
+       if (alen == 3)
+               addr++;
+
+       /* address, and data */
+       if (spi_xfer(slave, 16, addr, NULL, 0))
+               return -1;
+       if (spi_xfer(slave, 8 * len, NULL, buffer, SPI_XFER_END))
+               return -1;
+
+       spi_release_bus(slave);
+       spi_free_slave(slave);
+       return len;
+}
+
+ssize_t spi_write(uchar *addr, int alen, uchar *buffer, int len)
+{
+       struct spi_slave *slave;
+       char buf[3];
+       ulong start;
+
+       slave = spi_setup_slave(CONFIG_DEFAULT_SPI_BUS, 1, 1000000,
+                       CONFIG_DEFAULT_SPI_MODE);
+       if (!slave)
+               return 0;
+
+       spi_claim_bus(slave);
+
+       buf[0] = SPI_EEPROM_WREN;
+       if (spi_xfer(slave, 8, buf, NULL, SPI_XFER_BEGIN | SPI_XFER_END))
+               return -1;
+
+       buf[0] = SPI_EEPROM_WRITE;
+
+       /* As for reading, drop addr[0] if alen is 3 */
+       if (alen == 3) {
+               alen--;
+               addr++;
+       }
+
+       memcpy(buf + 1, addr, alen);
+       /* command + addr, then data */
+       if (spi_xfer(slave, 24, buf, NULL, SPI_XFER_BEGIN))
+               return -1;
+       if (spi_xfer(slave, len * 8, buffer, NULL, SPI_XFER_END))
+               return -1;
+
+       start = get_timer(0);
+       do {
+               buf[0] = SPI_EEPROM_RDSR;
+               buf[1] = 0;
+               spi_xfer(slave, 16, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
+
+               if (!(buf[1] & 1))
+                       break;
+
+       } while (get_timer(start) < CONFIG_SYS_SPI_WRITE_TOUT);
+
+       if (buf[1] & 1)
+               printf("*** spi_write: Timeout while writing!\n");
+
+       spi_release_bus(slave);
+       spi_free_slave(slave);
+       return len;
+}