mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 08:21:14 +00:00
417 lines
11 KiB
Diff
417 lines
11 KiB
Diff
--- /dev/null
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+++ b/drivers/i2c/busses/i2c-cns3xxx.c
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@@ -0,0 +1,388 @@
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+#include <asm/io.h>
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+#include <linux/wait.h>
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+#include <linux/interrupt.h>
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+#include <linux/delay.h>
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+#include <linux/i2c.h>
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+#include <mach/pm.h>
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+
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+/*
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+ * We need the memory map
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+ */
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+
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+#include <mach/board.h>
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+
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+#define MISC_MEM_MAP_VALUE(reg_offset) (*((uint32_t volatile *)(CNS3XXX_MISC_BASE_VIRT + reg_offset)))
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+#define MISC_IOCDB_CTRL MISC_MEM_MAP_VALUE(0x020)
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+
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+#define I2C_MEM_MAP_ADDR(x) (CNS3XXX_SSP_BASE_VIRT + x)
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+#define I2C_MEM_MAP_VALUE(x) (*((unsigned int volatile*)I2C_MEM_MAP_ADDR(x)))
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+
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+#define I2C_CONTROLLER_REG I2C_MEM_MAP_VALUE(0x20)
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+#define I2C_TIME_OUT_REG I2C_MEM_MAP_VALUE(0x24)
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+#define I2C_SLAVE_ADDRESS_REG I2C_MEM_MAP_VALUE(0x28)
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+#define I2C_WRITE_DATA_REG I2C_MEM_MAP_VALUE(0x2C)
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+#define I2C_READ_DATA_REG I2C_MEM_MAP_VALUE(0x30)
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+#define I2C_INTERRUPT_STATUS_REG I2C_MEM_MAP_VALUE(0x34)
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+#define I2C_INTERRUPT_ENABLE_REG I2C_MEM_MAP_VALUE(0x38)
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+#define I2C_TWI_OUT_DLY_REG I2C_MEM_MAP_VALUE(0x3C)
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+
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+#define I2C_BUS_ERROR_FLAG (0x1)
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+#define I2C_ACTION_DONE_FLAG (0x2)
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+
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+#define CNS3xxx_I2C_ENABLE() (I2C_CONTROLLER_REG) |= ((unsigned int)0x1 << 31)
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+#define CNS3xxx_I2C_DISABLE() (I2C_CONTROLLER_REG) &= ~((unsigned int)0x1 << 31)
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+#define CNS3xxx_I2C_ENABLE_INTR() (I2C_INTERRUPT_ENABLE_REG) |= 0x03
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+#define CNS3xxx_I2C_DISABLE_INTR() (I2C_INTERRUPT_ENABLE_REG) &= 0xfc
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+
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+#define TWI_TIMEOUT (10*HZ)
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+#define I2C_100KHZ 100000
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+#define I2C_200KHZ 200000
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+#define I2C_300KHZ 300000
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+#define I2C_400KHZ 400000
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+
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+#define CNS3xxx_I2C_CLK I2C_100KHZ
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+
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+#define STATE_DONE 1
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+#define STATE_ERROR 2
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+
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+struct cns3xxx_i2c {
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+ void __iomem *base;
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+ wait_queue_head_t wait;
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+ struct i2c_adapter adap;
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+ struct i2c_msg *msg;
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+ int state; /* see STATE_ */
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+ int rd_wr_len;
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+ u8 *buf;
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+};
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+
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+static u32 cns3xxx_i2c_func(struct i2c_adapter *adap)
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+{
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+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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+}
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+
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+static int
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+cns3xxx_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg)
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+{
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+ struct cns3xxx_i2c *i2c = i2c_get_adapdata(adap);
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+ int i, j;
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+ u8 buf[1] = { 0 };
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+
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+ if (msg->len == 0) {
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+ /*
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+ * We are probably doing a probe for a device here,
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+ * so set the length to one, and data to 0
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+ */
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+ msg->len = 1;
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+ i2c->buf = buf;
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+ } else {
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+ i2c->buf = msg->buf;
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+ }
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+
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+ if (msg->flags & I2C_M_TEN) {
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+ printk
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+ ("%s:%d: Presently the driver does not handle extended addressing\n",
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+ __FUNCTION__, __LINE__);
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+ return -EINVAL;
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+ }
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+ i2c->msg = msg;
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+
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+ for (i = 0; i < msg->len; i++) {
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+ if (msg->len - i >= 4)
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+ i2c->rd_wr_len = 3;
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+ else
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+ i2c->rd_wr_len = msg->len - i - 1;
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+
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+ // Set Data Width and TWI_EN
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+ I2C_CONTROLLER_REG = 0x80000000 | (i2c->rd_wr_len << 2) | (i2c->rd_wr_len);
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+
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+ // Clear Write Reg
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+ I2C_WRITE_DATA_REG = 0;
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+
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+ // Set the slave address
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+ I2C_SLAVE_ADDRESS_REG = (msg->addr << 1);
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+
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+ // Are we Writing
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+ if (!(msg->flags & I2C_M_RD)) {
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+ I2C_CONTROLLER_REG |= (1 << 4);
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+ if (i != 0) {
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+ /*
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+ * We need to set the address in the first byte.
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+ * The base address is going to be in buf[0] and then
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+ * it needs to be incremented by i - 1.
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+ */
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+ i2c->buf--;
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+ *i2c->buf = buf[0] + i - 1;
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+
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+ if (i2c->rd_wr_len < 3) {
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+ i += i2c->rd_wr_len;
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+ i2c->rd_wr_len++;
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+ I2C_CONTROLLER_REG = 0x80000000 | (1 << 4) | (i2c->rd_wr_len << 2) | (i2c->rd_wr_len);
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+ } else {
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+ i += i2c->rd_wr_len - 1;
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+ }
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+ } else {
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+ i += i2c->rd_wr_len;
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+ buf[0] = *i2c->buf;
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+ }
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+ for (j = 0; j <= i2c->rd_wr_len; j++) {
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+ I2C_WRITE_DATA_REG |= ((*i2c->buf++) << (8 * j));
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+ }
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+ } else {
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+ i += i2c->rd_wr_len;
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+ }
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+
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+ // Start the Transfer
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+ i2c->state = 0; // Clear out the State
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+ I2C_CONTROLLER_REG |= (1 << 6);
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+
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+ if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) ||
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+ (i2c->state == STATE_DONE), TWI_TIMEOUT)) {
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+ if (i2c->state == STATE_ERROR) {
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+ return -EIO;
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+ }
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+ } else {
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+ return -ETIMEDOUT;
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+ }
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+ }
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+ return 0;
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+}
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+
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+static int
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+cns3xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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+{
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+ int i;
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+ int ret;
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+ for (i = 0; i < num; i++)
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+ {
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+ ret = cns3xxx_i2c_xfer_msg(adap, &msgs[i]);
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+ if (ret < 0) {
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+ return ret;
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+ }
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+ }
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+ return num;
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+}
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+
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+
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+static struct i2c_algorithm cns3xxx_i2c_algo = {
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+ .master_xfer = cns3xxx_i2c_xfer,
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+ .functionality = cns3xxx_i2c_func,
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+};
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+
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+static struct i2c_adapter cns3xxx_i2c_adapter = {
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+ .owner = THIS_MODULE,
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+ .algo = &cns3xxx_i2c_algo,
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+ .algo_data = NULL,
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+ .nr = 0,
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+ .name = "CNS3xxx I2C 0",
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+ .retries = 5,
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+};
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+
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+static void cns3xxx_i2c_adapter_init(struct cns3xxx_i2c *i2c)
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+{
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+
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+ /* Steps
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+ * 1. Check if the power is enabled to the module (PMU_BASE + 0x010)
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+ * 2. Enable the clock (Enabled by default (PMU doc
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+ * but check clk status anyway PMU_BASE + 0X00C)
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+ * 3. Configure the registers of i2c
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+ */
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+
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+ // if (!CNS3xxx_I2C_POWER_ON())
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+// CNS3xxx_I2C_POWER_ENABLE();
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+
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+ // if (!CNS3xxx_I2C_CLOCK())
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+ // CNS3xxx_I2C_CLOCK_ENABLE();
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+
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+ cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_SPI_PCM_I2C);
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+ cns3xxx_pwr_power_up(0x1 << PM_CLK_GATE_REG_OFFSET_SPI_PCM_I2C);
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+ cns3xxx_pwr_soft_rst(0x1 << PM_CLK_GATE_REG_OFFSET_SPI_PCM_I2C);
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+
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+ /* Disable the I2C */
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+ I2C_CONTROLLER_REG = 0; /* Disabled the I2C */
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+
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+ //enable SCL and SDA which share pin with GPIOB_PIN_EN(0x18)
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+ //GPIOB[12]: SCL
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+ //GPIOB[13]: SDA
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+ (*(u32*)(CNS3XXX_MISC_BASE_VIRT+0x18)) |= ((1<<12)|(1<<13));
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+
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+ MISC_IOCDB_CTRL &= ~0x300;
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+ MISC_IOCDB_CTRL |= 0x300; //21mA...
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+
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+ /* Check the Reg Dump when testing */
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+ I2C_TIME_OUT_REG =
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+ ((((((cns3xxx_cpu_clock()*(1000000/8)) / (2 * CNS3xxx_I2C_CLK)) -
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+ 1) & 0x3FF) << 8) | (1 << 7) | 0x7F);
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+ I2C_TWI_OUT_DLY_REG |= 0x3;
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+
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+ /* Enable The Interrupt */
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+ CNS3xxx_I2C_ENABLE_INTR();
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+
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+ /* Clear Interrupt Status (0x2 | 0x1) */
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+ I2C_INTERRUPT_STATUS_REG |= (I2C_ACTION_DONE_FLAG | I2C_BUS_ERROR_FLAG);
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+
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+ /* Enable the I2C Controller */
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+ CNS3xxx_I2C_ENABLE();
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+}
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+
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+static irqreturn_t cns3xxx_i2c_isr(int irq, void *dev_id)
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+{
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+ struct cns3xxx_i2c *i2c = dev_id;
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+ int i;
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+ uint32_t stat = I2C_INTERRUPT_STATUS_REG;
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+
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+ /* Clear Interrupt */
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+ I2C_INTERRUPT_STATUS_REG |= 0x1;
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+
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+ if (stat & I2C_BUS_ERROR_FLAG) {
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+ i2c->state = STATE_ERROR;
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+ } else {
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+ if (i2c->msg->flags & I2C_M_RD) {
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+ for (i = 0; i <= i2c->rd_wr_len; i++)
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+ {
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+ *i2c->buf++ = ((I2C_READ_DATA_REG >> (8 * i)) & 0xff);
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+ }
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+ }
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+ i2c->state = STATE_DONE;
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+ }
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+ wake_up(&i2c->wait);
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+ return IRQ_HANDLED;
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+}
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+
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+static int __devinit cns3xxx_i2c_probe(struct platform_device *pdev)
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+{
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+ struct cns3xxx_i2c *i2c;
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+ struct resource *res, *res2;
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+ int ret;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res) {
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+ printk("%s: IORESOURCE_MEM not defined \n", __FUNCTION__);
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+ return -ENODEV;
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+ }
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+
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+ res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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+ if (!res2) {
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+ printk("%s: IORESOURCE_IRQ not defined \n", __FUNCTION__);
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+ return -ENODEV;
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+ }
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+
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+ i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
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+ if (!i2c)
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+ return -ENOMEM;
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+
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+ if (!request_mem_region(res->start, res->end - res->start + 1,
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+ pdev->name)) {
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+ dev_err(&pdev->dev, "Memory region busy\n");
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+ ret = -EBUSY;
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+ goto request_mem_failed;
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+ }
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+
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+ i2c->base = ioremap(res->start, res->end - res->start + 1);
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+ if (!i2c->base) {
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+ dev_err(&pdev->dev, "Unable to map registers\n");
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+ ret = -EIO;
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+ goto map_failed;
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+ }
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+
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+ cns3xxx_i2c_adapter_init(i2c);
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+
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+ init_waitqueue_head(&i2c->wait);
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+ ret = request_irq(res2->start, cns3xxx_i2c_isr, 0, pdev->name, i2c);
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+ if (ret) {
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+ dev_err(&pdev->dev, "Cannot claim IRQ\n");
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+ goto request_irq_failed;
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+ }
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+
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+ platform_set_drvdata(pdev, i2c);
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+ i2c->adap = cns3xxx_i2c_adapter;
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+ i2c_set_adapdata(&i2c->adap, i2c);
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+ i2c->adap.dev.parent = &pdev->dev;
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+
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+ /* add i2c adapter to i2c tree */
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+ ret = i2c_add_numbered_adapter(&i2c->adap);
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+ if (ret) {
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+ dev_err(&pdev->dev, "Failed to add adapter\n");
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+ goto add_adapter_failed;
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+ }
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+
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+ return 0;
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+
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+ add_adapter_failed:
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+ free_irq(res2->start, i2c);
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+ request_irq_failed:
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+ iounmap(i2c->base);
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+ map_failed:
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+ release_mem_region(res->start, res->end - res->start + 1);
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+ request_mem_failed:
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+ kfree(i2c);
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+
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+ return ret;
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+}
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+
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+static int __devexit cns3xxx_i2c_remove(struct platform_device *pdev)
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+{
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+ struct cns3xxx_i2c *i2c = platform_get_drvdata(pdev);
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+ struct resource *res;
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+
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+ /* disable i2c logic */
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+ CNS3xxx_I2C_DISABLE_INTR();
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+ CNS3xxx_I2C_DISABLE();
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+ /* remove adapter & data */
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+ i2c_del_adapter(&i2c->adap);
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+ platform_set_drvdata(pdev, NULL);
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+
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+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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+ if (res)
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+ free_irq(res->start, i2c);
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+
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+ iounmap(i2c->base);
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (res)
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+ release_mem_region(res->start, res->end - res->start + 1);
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+
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+ kfree(i2c);
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+#warning "CONFIG_PM defined: suspend and resume not implemented"
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+#define cns3xxx_i2c_suspend NULL
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+#define cns3xxx_i2c_resume NULL
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+#else
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+#define cns3xxx_i2c_suspend NULL
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+#define cns3xxx_i2c_resume NULL
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+#endif
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+
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+static struct platform_driver cns3xxx_i2c_driver = {
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+ .probe = cns3xxx_i2c_probe,
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+ .remove = cns3xxx_i2c_remove,
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+ .suspend = cns3xxx_i2c_suspend,
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+ .resume = cns3xxx_i2c_resume,
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "cns3xxx-i2c",
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+ },
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+};
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+
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+static int __init cns3xxx_i2c_init(void)
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+{
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+ return platform_driver_register(&cns3xxx_i2c_driver);
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+}
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+
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+static void __exit cns3xxx_i2c_exit(void)
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+{
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+ platform_driver_unregister(&cns3xxx_i2c_driver);
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+}
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+
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+module_init(cns3xxx_i2c_init);
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+module_exit(cns3xxx_i2c_exit);
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+
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+MODULE_AUTHOR("Cavium Networks");
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+MODULE_DESCRIPTION("Cavium CNS3XXX I2C Controller");
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+MODULE_LICENSE("GPL");
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--- a/drivers/i2c/busses/Kconfig
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+++ b/drivers/i2c/busses/Kconfig
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@@ -422,6 +422,12 @@ config I2C_MV64XXX
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This driver can also be built as a module. If so, the module
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will be called i2c-mv64xxx.
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+config I2C_CNS3XXX
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+ tristate "Cavium Networks CNS3XXX I2C Controller"
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+ depends on ARCH_CNS3XXX
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+ help
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+ Supports the Cavium Networks CNS3XXX on-chip I2C interfaces
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+
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config I2C_OCORES
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tristate "OpenCores I2C Controller"
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depends on EXPERIMENTAL
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--- a/drivers/i2c/busses/Makefile
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+++ b/drivers/i2c/busses/Makefile
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@@ -39,6 +39,7 @@ obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
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obj-$(CONFIG_I2C_IXP2000) += i2c-ixp2000.o
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obj-$(CONFIG_I2C_MPC) += i2c-mpc.o
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obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o
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+obj-$(CONFIG_I2C_CNS3XXX) += i2c-cns3xxx.o
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obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o
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obj-$(CONFIG_I2C_OMAP) += i2c-omap.o
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obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
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