i2c: zynq: Add support for Xilinx Zynq
authorMichal Simek <michal.simek@xilinx.com>
Mon, 22 Apr 2013 13:21:33 +0000 (15:21 +0200)
committerMichal Simek <michal.simek@xilinx.com>
Tue, 30 Apr 2013 09:39:28 +0000 (11:39 +0200)
Support Xilinx Zynq i2c controller.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Tom Rini <trini@ti.com>
arch/arm/include/asm/arch-zynq/hardware.h
drivers/i2c/Makefile
drivers/i2c/zynq_i2c.c [new file with mode: 0644]
include/configs/zynq.h

index 8eb4e1a..6af892a 100644 (file)
@@ -31,6 +31,8 @@
 #define ZYNQ_GEM_BASEADDR1             0xE000C000
 #define ZYNQ_SDHCI_BASEADDR0           0xE0100000
 #define ZYNQ_SDHCI_BASEADDR1           0xE0101000
+#define ZYNQ_I2C_BASEADDR0             0xE0004000
+#define ZYNQ_I2C_BASEADDR1             0xE0005000
 
 /* Reflect slcr offsets */
 struct slcr_regs {
index 5dbdbe3..72e85a3 100644 (file)
@@ -46,6 +46,7 @@ COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
 COBJS-$(CONFIG_U8500_I2C) += u8500_i2c.o
 COBJS-$(CONFIG_SH_I2C) += sh_i2c.o
 COBJS-$(CONFIG_SH_SH7734_I2C) += sh_sh7734_i2c.o
+COBJS-$(CONFIG_ZYNQ_I2C) += zynq_i2c.o
 
 COBJS  := $(COBJS-y)
 SRCS   := $(COBJS:.o=.c)
diff --git a/drivers/i2c/zynq_i2c.c b/drivers/i2c/zynq_i2c.c
new file mode 100644 (file)
index 0000000..ec49660
--- /dev/null
@@ -0,0 +1,306 @@
+/*
+ * Driver for the Zynq-7000 PS I2C controller
+ * IP from Cadence (ID T-CS-PE-0007-100, Version R1p10f2)
+ *
+ * Author: Joe Hershberger <joe.hershberger@ni.com>
+ * Copyright (c) 2012 Joe Hershberger.
+ *
+ * Copyright (c) 2012-2013 Xilinx, Michal Simek
+ *
+ * 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 <asm/io.h>
+#include <i2c.h>
+#include <asm/errno.h>
+#include <asm/arch/hardware.h>
+
+/* i2c register set */
+struct zynq_i2c_registers {
+       u32 control;
+       u32 status;
+       u32 address;
+       u32 data;
+       u32 interrupt_status;
+       u32 transfer_size;
+       u32 slave_mon_pause;
+       u32 time_out;
+       u32 interrupt_mask;
+       u32 interrupt_enable;
+       u32 interrupt_disable;
+};
+
+/* Control register fields */
+#define ZYNQ_I2C_CONTROL_RW            0x00000001
+#define ZYNQ_I2C_CONTROL_MS            0x00000002
+#define ZYNQ_I2C_CONTROL_NEA           0x00000004
+#define ZYNQ_I2C_CONTROL_ACKEN         0x00000008
+#define ZYNQ_I2C_CONTROL_HOLD          0x00000010
+#define ZYNQ_I2C_CONTROL_SLVMON                0x00000020
+#define ZYNQ_I2C_CONTROL_CLR_FIFO      0x00000040
+#define ZYNQ_I2C_CONTROL_DIV_B_SHIFT   8
+#define ZYNQ_I2C_CONTROL_DIV_B_MASK    0x00003F00
+#define ZYNQ_I2C_CONTROL_DIV_A_SHIFT   14
+#define ZYNQ_I2C_CONTROL_DIV_A_MASK    0x0000C000
+
+/* Status register values */
+#define ZYNQ_I2C_STATUS_RXDV   0x00000020
+#define ZYNQ_I2C_STATUS_TXDV   0x00000040
+#define ZYNQ_I2C_STATUS_RXOVF  0x00000080
+#define ZYNQ_I2C_STATUS_BA     0x00000100
+
+/* Interrupt register fields */
+#define ZYNQ_I2C_INTERRUPT_COMP                0x00000001
+#define ZYNQ_I2C_INTERRUPT_DATA                0x00000002
+#define ZYNQ_I2C_INTERRUPT_NACK                0x00000004
+#define ZYNQ_I2C_INTERRUPT_TO          0x00000008
+#define ZYNQ_I2C_INTERRUPT_SLVRDY      0x00000010
+#define ZYNQ_I2C_INTERRUPT_RXOVF       0x00000020
+#define ZYNQ_I2C_INTERRUPT_TXOVF       0x00000040
+#define ZYNQ_I2C_INTERRUPT_RXUNF       0x00000080
+#define ZYNQ_I2C_INTERRUPT_ARBLOST     0x00000200
+
+#define ZYNQ_I2C_FIFO_DEPTH            16
+#define ZYNQ_I2C_TRANSFERT_SIZE_MAX    255 /* Controller transfer limit */
+
+#if defined(CONFIG_ZYNQ_I2C0)
+# define ZYNQ_I2C_BASE ZYNQ_I2C_BASEADDR0
+#else
+# define ZYNQ_I2C_BASE ZYNQ_I2C_BASEADDR1
+#endif
+
+static struct zynq_i2c_registers *zynq_i2c =
+       (struct zynq_i2c_registers *)ZYNQ_I2C_BASE;
+
+/* I2C init called by cmd_i2c when doing 'i2c reset'. */
+void i2c_init(int requested_speed, int slaveadd)
+{
+       /* 111MHz / ( (3 * 17) * 22 ) = ~100KHz */
+       writel((16 << ZYNQ_I2C_CONTROL_DIV_B_SHIFT) |
+               (2 << ZYNQ_I2C_CONTROL_DIV_A_SHIFT), &zynq_i2c->control);
+
+       /* Enable master mode, ack, and 7-bit addressing */
+       setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_MS |
+               ZYNQ_I2C_CONTROL_ACKEN | ZYNQ_I2C_CONTROL_NEA);
+}
+
+#ifdef DEBUG
+static void zynq_i2c_debug_status(void)
+{
+       int int_status;
+       int status;
+       int_status = readl(&zynq_i2c->interrupt_status);
+
+       status = readl(&zynq_i2c->status);
+       if (int_status || status) {
+               debug("Status: ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_COMP)
+                       debug("COMP ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_DATA)
+                       debug("DATA ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_NACK)
+                       debug("NACK ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_TO)
+                       debug("TO ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_SLVRDY)
+                       debug("SLVRDY ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_RXOVF)
+                       debug("RXOVF ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_TXOVF)
+                       debug("TXOVF ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_RXUNF)
+                       debug("RXUNF ");
+               if (int_status & ZYNQ_I2C_INTERRUPT_ARBLOST)
+                       debug("ARBLOST ");
+               if (status & ZYNQ_I2C_STATUS_RXDV)
+                       debug("RXDV ");
+               if (status & ZYNQ_I2C_STATUS_TXDV)
+                       debug("TXDV ");
+               if (status & ZYNQ_I2C_STATUS_RXOVF)
+                       debug("RXOVF ");
+               if (status & ZYNQ_I2C_STATUS_BA)
+                       debug("BA ");
+               debug("TS%d ", readl(&zynq_i2c->transfer_size));
+               debug("\n");
+       }
+}
+#endif
+
+/* Wait for an interrupt */
+static u32 zynq_i2c_wait(u32 mask)
+{
+       int timeout, int_status;
+
+       for (timeout = 0; timeout < 100; timeout++) {
+               udelay(100);
+               int_status = readl(&zynq_i2c->interrupt_status);
+               if (int_status & mask)
+                       break;
+       }
+#ifdef DEBUG
+       zynq_i2c_debug_status();
+#endif
+       /* Clear interrupt status flags */
+       writel(int_status & mask, &zynq_i2c->interrupt_status);
+
+       return int_status & mask;
+}
+
+/*
+ * I2C probe called by cmd_i2c when doing 'i2c probe'.
+ * Begin read, nak data byte, end.
+ */
+int i2c_probe(u8 dev)
+{
+       /* Attempt to read a byte */
+       setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
+               ZYNQ_I2C_CONTROL_RW);
+       clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
+       writel(0xFF, &zynq_i2c->interrupt_status);
+       writel(dev, &zynq_i2c->address);
+       writel(1, &zynq_i2c->transfer_size);
+
+       return (zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP |
+               ZYNQ_I2C_INTERRUPT_NACK) &
+               ZYNQ_I2C_INTERRUPT_COMP) ? 0 : -ETIMEDOUT;
+}
+
+/*
+ * I2C read called by cmd_i2c when doing 'i2c read' and by cmd_eeprom.c
+ * Begin write, send address byte(s), begin read, receive data bytes, end.
+ */
+int i2c_read(u8 dev, uint addr, int alen, u8 *data, int length)
+{
+       u32 status;
+       u32 i = 0;
+       u8 *cur_data = data;
+
+       /* Check the hardware can handle the requested bytes */
+       if ((length < 0) || (length > ZYNQ_I2C_TRANSFERT_SIZE_MAX))
+               return -EINVAL;
+
+       /* Write the register address */
+       setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
+               ZYNQ_I2C_CONTROL_HOLD);
+       /*
+        * Temporarily disable restart (by clearing hold)
+        * It doesn't seem to work.
+        */
+       clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW |
+               ZYNQ_I2C_CONTROL_HOLD);
+       writel(0xFF, &zynq_i2c->interrupt_status);
+       while (alen--)
+               writel(addr >> (8*alen), &zynq_i2c->data);
+       writel(dev, &zynq_i2c->address);
+
+       /* Wait for the address to be sent */
+       if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
+               /* Release the bus */
+               clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
+               return -ETIMEDOUT;
+       }
+       debug("Device acked address\n");
+
+       setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
+               ZYNQ_I2C_CONTROL_RW);
+       /* Start reading data */
+       writel(dev, &zynq_i2c->address);
+       writel(length, &zynq_i2c->transfer_size);
+
+       /* Wait for data */
+       do {
+               status = zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP |
+                       ZYNQ_I2C_INTERRUPT_DATA);
+               if (!status) {
+                       /* Release the bus */
+                       clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
+                       return -ETIMEDOUT;
+               }
+               debug("Read %d bytes\n",
+                     length - readl(&zynq_i2c->transfer_size));
+               for (; i < length - readl(&zynq_i2c->transfer_size); i++)
+                       *(cur_data++) = readl(&zynq_i2c->data);
+       } while (readl(&zynq_i2c->transfer_size) != 0);
+       /* All done... release the bus */
+       clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
+
+#ifdef DEBUG
+       zynq_i2c_debug_status();
+#endif
+       return 0;
+}
+
+/*
+ * I2C write called by cmd_i2c when doing 'i2c write' and by cmd_eeprom.c
+ * Begin write, send address byte(s), send data bytes, end.
+ */
+int i2c_write(u8 dev, uint addr, int alen, u8 *data, int length)
+{
+       u8 *cur_data = data;
+
+       /* Write the register address */
+       setbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_CLR_FIFO |
+               ZYNQ_I2C_CONTROL_HOLD);
+       clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_RW);
+       writel(0xFF, &zynq_i2c->interrupt_status);
+       while (alen--)
+               writel(addr >> (8*alen), &zynq_i2c->data);
+       /* Start the tranfer */
+       writel(dev, &zynq_i2c->address);
+       if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
+               /* Release the bus */
+               clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
+               return -ETIMEDOUT;
+       }
+
+       debug("Device acked address\n");
+       while (length--) {
+               writel(*(cur_data++), &zynq_i2c->data);
+               if (readl(&zynq_i2c->transfer_size) == ZYNQ_I2C_FIFO_DEPTH) {
+                       if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP)) {
+                               /* Release the bus */
+                               clrbits_le32(&zynq_i2c->control,
+                                            ZYNQ_I2C_CONTROL_HOLD);
+                               return -ETIMEDOUT;
+                       }
+               }
+       }
+
+       /* All done... release the bus */
+       clrbits_le32(&zynq_i2c->control, ZYNQ_I2C_CONTROL_HOLD);
+       /* Wait for the address and data to be sent */
+       if (!zynq_i2c_wait(ZYNQ_I2C_INTERRUPT_COMP))
+               return -ETIMEDOUT;
+       return 0;
+}
+
+int i2c_set_bus_num(unsigned int bus)
+{
+       /* Only support bus 0 */
+       if (bus > 0)
+               return -1;
+       return 0;
+}
+
+unsigned int i2c_get_bus_num(void)
+{
+       /* Only support bus 0 */
+       return 0;
+}
index 2ed88a7..f1f182e 100644 (file)
 # define CONFIG_DOS_PARTITION
 #endif
 
+#define CONFIG_ZYNQ_I2C0
+
+/* I2C */
+#if defined(CONFIG_ZYNQ_I2C0) || defined(CONFIG_ZYNQ_I2C1)
+# define CONFIG_CMD_I2C
+# define CONFIG_ZYNQ_I2C
+# define CONFIG_HARD_I2C
+# define CONFIG_SYS_I2C_SPEED          100000
+# define CONFIG_SYS_I2C_SLAVE          1
+#endif
+
 #if defined(CONFIG_ZYNQ_DCC)
 # define CONFIG_ARM_DCC
 # define CONFIG_CPU_V6 /* Required by CONFIG_ARM_DCC */