--- /dev/null
+/*
+ * (C) Copyright 2012
+ * Valentin Lontgchamp, Keymile AG, valentin.longchamp@keymile.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <asm/errno.h>
+
+/* GPIO Pin from kirkwood connected to PROGRAM_B pin of the xilinx FPGA */
+#define KM_XLX_PROGRAM_B_PIN 39
+
+#define BOCO_ADDR 0x10
+
+#define ID_REG 0x00
+#define BOCO2_ID 0x5b
+
+static int check_boco2(void)
+{
+ int ret;
+ u8 id;
+
+ ret = i2c_read(BOCO_ADDR, ID_REG, 1, &id, 1);
+ if (ret) {
+ printf("%s: error reading the BOCO id !!\n", __func__);
+ return ret;
+ }
+
+ return (id == BOCO2_ID);
+}
+
+static int boco_clear_bits(u8 reg, u8 flags)
+{
+ int ret;
+ u8 regval;
+
+ /* give access to the EEPROM from FPGA */
+ ret = i2c_read(BOCO_ADDR, reg, 1, ®val, 1);
+ if (ret) {
+ printf("%s: error reading the BOCO @%#x !!\n",
+ __func__, reg);
+ return ret;
+ }
+ regval &= ~flags;
+ ret = i2c_write(BOCO_ADDR, reg, 1, ®val, 1);
+ if (ret) {
+ printf("%s: error writing the BOCO @%#x !!\n",
+ __func__, reg);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int boco_set_bits(u8 reg, u8 flags)
+{
+ int ret;
+ u8 regval;
+
+ /* give access to the EEPROM from FPGA */
+ ret = i2c_read(BOCO_ADDR, reg, 1, ®val, 1);
+ if (ret) {
+ printf("%s: error reading the BOCO @%#x !!\n",
+ __func__, reg);
+ return ret;
+ }
+ regval |= flags;
+ ret = i2c_write(BOCO_ADDR, reg, 1, ®val, 1);
+ if (ret) {
+ printf("%s: error writing the BOCO @%#x !!\n",
+ __func__, reg);
+ return ret;
+ }
+
+ return 0;
+}
+
+#define SPI_REG 0x06
+#define CFG_EEPROM 0x02
+#define FPGA_PROG 0x04
+#define FPGA_DONE 0x20
+
+int trigger_fpga_config(void)
+{
+ int ret = 0;
+
+ if (check_boco2()) {
+ /* we have a BOCO2, this has to be triggered here */
+
+ /* make sure the FPGA_can access the EEPROM */
+ ret = boco_clear_bits(SPI_REG, CFG_EEPROM);
+ if (ret)
+ return ret;
+
+ /* trigger the config start */
+ ret = boco_clear_bits(SPI_REG, FPGA_PROG);
+ if (ret)
+ return ret;
+
+ /* small delay for the pulse */
+ udelay(10);
+
+ /* up signal for pulse end */
+ ret = boco_set_bits(SPI_REG, FPGA_PROG);
+ if (ret)
+ return ret;
+
+ } else {
+ /* we do it the old way, with the gpio pin */
+ kw_gpio_set_valid(KM_XLX_PROGRAM_B_PIN, 1);
+ kw_gpio_direction_output(KM_XLX_PROGRAM_B_PIN, 0);
+ /* small delay for the pulse */
+ udelay(10);
+ kw_gpio_direction_input(KM_XLX_PROGRAM_B_PIN);
+ }
+
+ return 0;
+}
+
+int wait_for_fpga_config(void)
+{
+ int ret = 0;
+ u8 spictrl;
+ u32 timeout = 20000;
+
+ if (!check_boco2()) {
+ /* we do not have BOCO2, this is not really used */
+ return 0;
+ }
+
+ printf("PCIe FPGA config:");
+ do {
+ ret = i2c_read(BOCO_ADDR, SPI_REG, 1, &spictrl, 1);
+ if (ret) {
+ printf("%s: error reading the BOCO spictrl !!\n",
+ __func__);
+ return ret;
+ }
+ if (timeout-- == 0) {
+ printf(" FPGA_DONE timeout\n");
+ return -EFAULT;
+ }
+ udelay(10);
+ } while (!(spictrl & FPGA_DONE));
+
+ printf(" done\n");
+
+ return 0;
+}
+
+#define PRST1 0x4
+#define BRIDGE_RST 0x4
+
+int fpga_reset(void)
+{
+ int ret = 0;
+
+ if (!check_boco2()) {
+ /* we do not have BOCO2, this is not really used */
+ return 0;
+ }
+
+ ret = boco_clear_bits(PRST1, BRIDGE_RST);
+ if (ret)
+ return ret;
+
+ /* small delay for the pulse */
+ udelay(10);
+
+ ret = boco_set_bits(PRST1, BRIDGE_RST);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/* the FPGA was configured, we configure the BOCO2 so that the EEPROM
+ * is available from the Bobcat SPI bus */
+int toggle_eeprom_spi_bus(void)
+{
+ int ret = 0;
+
+ if (!check_boco2()) {
+ /* we do not have BOCO2, this is not really used */
+ return 0;
+ }
+
+ ret = boco_set_bits(SPI_REG, CFG_EEPROM);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
projects / oweals / u-boot.git / commitdiff