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828 lines
20 KiB
Diff
828 lines
20 KiB
Diff
--- a/drivers/i2c/busses/Makefile
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+++ b/drivers/i2c/busses/Makefile
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@@ -76,5 +76,6 @@
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obj-$(CONFIG_I2C_STUB) += i2c-stub.o
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obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
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obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
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+obj-$(CONFIG_I2C_FALCON) += i2c-falcon.o
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ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
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--- a/drivers/i2c/busses/Kconfig
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+++ b/drivers/i2c/busses/Kconfig
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@@ -281,6 +281,10 @@
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comment "I2C system bus drivers (mostly embedded / system-on-chip)"
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+config I2C_FALCON
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+ tristate "Falcon I2C interface"
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+# depends on SOC_FALCON
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+
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config I2C_AT91
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tristate "Atmel AT91 I2C Two-Wire interface (TWI)"
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depends on ARCH_AT91 && EXPERIMENTAL && BROKEN
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--- /dev/null
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+++ b/drivers/i2c/busses/i2c-falcon.c
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@@ -0,0 +1,802 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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+ */
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+
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+/* #define DEBUG */
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+
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+#include <linux/module.h>
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+#include <linux/ioport.h>
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+#include <linux/init.h>
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+#include <linux/platform_device.h>
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+#include <linux/i2c.h>
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+#include <linux/interrupt.h>
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+#include <linux/spinlock.h>
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+#include <linux/io.h>
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+#include <linux/clk.h>
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+#include <linux/err.h>
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+
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+/* CURRENT ISSUES:
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+ * - no high speed support
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+ * - rx issue with "address mode" & "tx end" interrupts
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+ * - ten bit mode is not tested
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+ */
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+
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+/* mapping for access macros */
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+#define reg_r32(reg) __raw_readl(reg)
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+#define reg_w32(val, reg) __raw_writel(val, reg)
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+#define reg_w32_mask(clear, set, reg) \
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+ reg_w32((reg_r32(reg) & ~(clear)) | (set), reg)
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+#define reg_r32_table(reg, idx) reg_r32(&((uint32_t *)®)[idx])
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+#define reg_w32_table(val, reg, idx) reg_w32(val, &((uint32_t *)®)[idx])
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+#define i2c (priv->membase)
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+#include <falcon/i2c_reg.h>
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+
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+/* enable hacks to overcome current issue */
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+#define FALCON_FIX_ME
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+
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+#define FALCON_I2C_ADDR 0x00
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+#define FALCON_I2C_READY_TIMEOUT 1000
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+#define FALCON_I2C_WAIT_TIMEOUT 10
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+
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+#define DRV_NAME "i2c-falcon"
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+
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+#if defined(DEBUG)
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+#define static /* no static functions for better debugging */
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+#endif
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+
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+#define FALCON_I2C_ARB_LOST (1 << 0)
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+#define FALCON_I2C_NACK (1 << 1)
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+#define FALCON_I2C_RX_UFL (1 << 2)
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+#define FALCON_I2C_RX_OFL (1 << 3)
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+#define FALCON_I2C_TX_UFL (1 << 4)
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+#define FALCON_I2C_TX_OFL (1 << 5)
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+#define FALCON_I2C_BURST_REQ (1 << 6)
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+#define FALCON_I2C_RX (1 << 7)
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+#define FALCON_I2C_TX_END (1 << 8)
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+#define FALCON_I2C_ADDR_MATCH (1 << 9) /* doesn't trigger */
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+
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+struct falcon_i2c {
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+ spinlock_t lock;
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+
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+ enum {
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+ FALCON_I2C_MODE_100 = 1,
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+ FALCON_I2C_MODE_400 = 2,
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+ FALCON_I2C_MODE_3400 = 3
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+ } mode; /* current speed mode */
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+
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+ int ten_bit; /* current address mode */
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+ unsigned long status; /* bus events holder */
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+ struct clk *clk; /* clock input for i2c hardware block */
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+ struct gpon_reg_i2c __iomem *membase; /* base of mapped registers */
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+ int irq_lb, irq_b, irq_err, irq_p; /* last burst, burst, error,
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+ protocol IRQs */
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+ struct completion done;
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+ struct i2c_adapter adap;
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+ struct device *dev;
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+};
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+
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+#define FALCON_I2C_ERROR_MASK (FALCON_I2C_NACK \
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+ | FALCON_I2C_ARB_LOST \
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+ | FALCON_I2C_RX_OFL \
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+ | FALCON_I2C_RX_UFL \
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+ | FALCON_I2C_TX_OFL \
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+ | FALCON_I2C_TX_UFL)
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+
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+#define FALCON_I2C_ERROR(priv) (priv->status & FALCON_I2C_ERROR_MASK)
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+#define FALCON_I2C_ERROR_CLEAR(priv) do { \
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+ priv->status &= \
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+ ~FALCON_I2C_ERROR_MASK; \
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+ } while (0)
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+
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+static void falcon_addr_configure(struct falcon_i2c *priv, int ten_bit)
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+{
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+ u32 ten_bit_mask = ten_bit ? I2C_ADDR_CFG_TBAM_10bit : 0;
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+
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+ /* configure address */
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+ i2c_w32(I2C_ADDR_CFG_SOPE_EN /* generate stop when no more data in the
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+ fifo */
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+ | I2C_ADDR_CFG_SONA_EN /* generate stop when NA received */
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+ | I2C_ADDR_CFG_MnS_EN /* we are master device */
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+ | ten_bit_mask
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+ | FALCON_I2C_ADDR, /* our address */
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+ addr_cfg);
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+}
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+
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+static irqreturn_t falcon_i2c_isr(int irq, void *dev_id)
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+{
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+ u32 i_raw, i_pro, i_err;
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+ struct falcon_i2c *priv = dev_id;
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+ unsigned long flags;
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+ unsigned int old_status;
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+
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+ spin_lock_irqsave(&priv->lock, flags);
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+
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+ old_status = (unsigned int)priv->status;
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+
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+ i_raw = i2c_r32(mis);
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+
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+ /* protocol interrupt */
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+ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC) {
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+ i_pro = i2c_r32(p_irqss);
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+
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+ /* tx -> rx switch */
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+ if (i_pro & I2C_P_IRQSS_RX)
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+ priv->status |= FALCON_I2C_RX;
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+
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+ /* tx end */
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+ if (i_pro & I2C_P_IRQSS_TX_END)
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+ priv->status |= FALCON_I2C_TX_END;
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+
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+ /* not acknowledge */
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+ if (i_pro & I2C_P_IRQSS_NACK)
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+ priv->status |= FALCON_I2C_NACK;
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+
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+ /* arbitration lost */
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+ if (i_pro & I2C_P_IRQSS_AL)
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+ priv->status |= FALCON_I2C_ARB_LOST;
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+
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+ /* address match */
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+ if (i_pro & I2C_P_IRQSS_AM)
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+ priv->status |= FALCON_I2C_ADDR_MATCH;
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+
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+ i2c_w32(i_pro, p_irqsc);
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+ }
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+
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+ /* error interrupt */
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+ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) {
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+ i_err = i2c_r32(err_irqss);
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+
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+ /* tx fifo overflow */
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+ if (i_err & I2C_ERR_IRQSS_TXF_OFL)
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+ priv->status |= FALCON_I2C_TX_OFL;
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+
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+ /* tx fifo underflow */
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+ if (i_err & I2C_ERR_IRQSS_TXF_UFL)
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+ priv->status |= FALCON_I2C_TX_UFL;
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+
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+ /* rx fifo overflow */
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+ if (i_err & I2C_ERR_IRQSS_RXF_OFL)
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+ priv->status |= FALCON_I2C_RX_OFL;
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+
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+ /* rx fifo underflow */
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+ if (i_err & I2C_ERR_IRQSS_RXF_UFL)
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+ priv->status |= FALCON_I2C_RX_UFL;
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+
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+ i2c_w32(i_err, err_irqsc);
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+ }
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+
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+ /* burst request */
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+ if (i_raw & I2C_RIS_BREQ_INT_INTOCC) {
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+ i2c_w32_mask(I2C_IMSC_BREQ_INT_EN, 0, imsc);
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+ i2c_w32_mask(0, I2C_ICR_BREQ_INT_CLR, icr);
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+
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+ priv->status |= FALCON_I2C_BURST_REQ;
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+ }
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+
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+ /* last burst request */
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+ if (i_raw & I2C_RIS_LBREQ_INT_INTOCC) {
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+ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN, 0, imsc);
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+ i2c_w32_mask(0, I2C_ICR_LBREQ_INT_CLR, icr);
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+
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+ priv->status |= FALCON_I2C_BURST_REQ;
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+ }
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+
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+ if (old_status != (unsigned int)priv->status)
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+ complete(&priv->done);
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+
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+ spin_unlock_irqrestore(&priv->lock, flags);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static int falcon_i2c_ready(struct falcon_i2c *priv)
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+{
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+ int timeout;
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+ u32 bus_stat;
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+ unsigned long flags;
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+ int ret;
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+
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+ for (timeout = 0; timeout < FALCON_I2C_READY_TIMEOUT; timeout++) {
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+ bus_stat = i2c_r32(bus_stat);
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+
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+ if (bus_stat & I2C_BUS_STAT_BS_SC) {
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+ cpu_relax();
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+ } else {
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+ spin_lock_irqsave(&priv->lock, flags);
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+
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+ if (FALCON_I2C_ERROR(priv)) {
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+ ret = priv->status;
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+
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+ dev_dbg(priv->dev, "bus ready wait error 0x%08lx\n", priv->status);
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+
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+ FALCON_I2C_ERROR_CLEAR(priv);
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+ } else {
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+ ret = 0;
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+ }
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+
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+ spin_unlock_irqrestore(&priv->lock, flags);
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+
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+ return ret;
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+ }
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+ }
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+
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+ dev_dbg(priv->dev, "bus ready wait timeout\n");
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+
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+ return -ETIME;
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+}
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+
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+static int falcon_i2c_wait(struct falcon_i2c *priv, unsigned long status)
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+{
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+ int ret = 0;
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+ unsigned long flags;
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+ unsigned int timeout;
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+
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+ spin_lock_irqsave(&priv->lock, flags);
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+
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+ priv->status &= FALCON_I2C_BURST_REQ;
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+
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+ /* check if the event already occurred */
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+ if ((priv->status & status) == status) {
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+ priv->status &= ~status;
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+ spin_unlock_irqrestore(&priv->lock, flags);
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+
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+ return 0;
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+ }
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+
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+ spin_unlock_irqrestore(&priv->lock, flags);
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+
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+ /* unmask burst interrupts */
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+ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc);
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+
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+ for (timeout = 0; timeout < FALCON_I2C_WAIT_TIMEOUT; timeout++) {
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+ /* wait for the data request */
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+ wait_for_completion_timeout(&priv->done, HZ / 10);
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+
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+ /* handle errors */
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+ spin_lock_irqsave(&priv->lock, flags);
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+
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+ if (FALCON_I2C_ERROR(priv)) {
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+ dev_dbg(priv->dev, "wait error 0x%08lx (waiting for 0x%08lx)\n",
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+ priv->status,
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+ status);
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+
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+ if (priv->status & FALCON_I2C_NACK)
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+ ret = -ENXIO;
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+ else
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+ ret = -EREMOTEIO;
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+
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+ FALCON_I2C_ERROR_CLEAR(priv);
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+ } else {
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+ if ((priv->status & status) == status) {
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+ priv->status &= ~status;
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+ spin_unlock_irqrestore(&priv->lock, flags);
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+
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+ return 0;
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+ }
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+ }
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+
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+ spin_unlock_irqrestore(&priv->lock, flags);
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+
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+ if (ret)
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+ return ret;
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+ }
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+
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+ dev_dbg(priv->dev, "wait timeout error 0x%08lx (waiting for 0x%08lx)\n",
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+ priv->status,
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+ status);
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+
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+ return -ETIME;
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+}
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+
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+static int falcon_i2c_tx(struct falcon_i2c *priv, int ten_bit, u16 addr,
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+ u8 *buf, int len)
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+{
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+ int i;
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+ int ret;
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+
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+ dev_dbg(priv->dev, "%s\n", __func__);
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+
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+ /* tell fifo the number of bytes we are going to send */
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+ i2c_w32(len + (ten_bit ? 2 : 1), tps_ctrl);
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+
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+ /* wait for the data request */
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+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
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+ if (ret)
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+ return ret;
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+
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+ /* send slave address */
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+ if (ten_bit) {
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+ i2c_w32(0x78 | ((addr >> 7) & 0x7), txd);
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+ i2c_w32(0x78 | ((addr & 0x7f) << 1) | 0, txd);
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+ } else {
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+ i2c_w32((addr << 1) | 0, txd);
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+ }
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+
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+ /* fill fifo */
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+ for (i = 0; i < len; i++) {
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+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
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+ if (ret)
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+ return ret;
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+
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+ i2c_w32(buf[i], txd);
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+ }
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+
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+ return falcon_i2c_wait(priv, FALCON_I2C_TX_END);
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+}
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+
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+static int falcon_i2c_rx(struct falcon_i2c *priv, int ten_bit, u16 addr,
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+ u8 *buf, int len)
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+{
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+ int i;
|
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+ int ret;
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+
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+ dev_dbg(priv->dev, "%s\n", __func__);
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+
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+ /* we need to transmit address only */
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+ i2c_w32(ten_bit ? 2 : 1, tps_ctrl);
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+
|
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+ /* set maximum received packet size */
|
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+ i2c_w32(len, mrps_ctrl);
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+
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+ /* wait for the data request */
|
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+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
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+ if (ret)
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+ return ret;
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+
|
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+ /* write down the address */
|
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+ if (ten_bit) {
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+ i2c_w32(0x78 | ((addr >> 7) & 0x7), txd);
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+ i2c_w32(0x78 | ((addr & 0x7f) << 1) | 1, txd);
|
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+ } else {
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+ i2c_w32((addr << 1) | 1, txd);
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+ }
|
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+
|
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+ /* wait for the read request */
|
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+ ret = falcon_i2c_wait(priv, FALCON_I2C_TX_END
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+#ifndef FALCON_FIX_ME
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+ | FALCON_I2C_ADDR_MATCH
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+#endif
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+ | FALCON_I2C_RX);
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+
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+ if (ret)
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+ return ret;
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+
|
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+ /* read bytes */
|
|
+ for (i = 0; i < len; i++) {
|
|
+#ifdef FALCON_FIX_ME
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+ while (i2c_r32(rps_stat) == 0)
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+ cpu_relax();
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+#else
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+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
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+
|
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+ if (ret)
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+ return ret;
|
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+#endif
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+
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+ buf[i] = i2c_r32(rxd);
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|
+ }
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+
|
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+#ifndef FALCON_FIX_ME
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|
+ /* wait for transmission end */
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+ return falcon_i2c_wait(priv, FALCON_I2C_TX_END);
|
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+#else
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+ return 0;
|
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+#endif
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+}
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+
|
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+static int falcon_i2c_xfer_msg(struct falcon_i2c *priv, struct i2c_msg *msg)
|
|
+{
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+ int ret;
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+ int ten_bit;
|
|
+ unsigned long flags;
|
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+
|
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+ dev_dbg(priv->dev, "%s %u byte(s) %s 0x%02x\n",
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|
+ (msg->flags & I2C_M_RD) ? "read" : "write", msg->len,
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+ (msg->flags & I2C_M_RD) ? "from" : "to", msg->addr);
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|
+
|
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+ if (msg->flags & I2C_M_TEN)
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+ ten_bit = 1;
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|
+ else
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+ ten_bit = 0;
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+
|
|
+ /* reconfigure bus if need to send message in different address mode */
|
|
+ spin_lock_irqsave(&priv->lock, flags);
|
|
+ if (ten_bit != priv->ten_bit) {
|
|
+
|
|
+ /* disable bus */
|
|
+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
|
|
+
|
|
+ /* reconfigure address */
|
|
+ falcon_addr_configure(priv, ten_bit);
|
|
+
|
|
+ /* enable bus */
|
|
+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
|
|
+
|
|
+ priv->ten_bit = ten_bit;
|
|
+ }
|
|
+ spin_unlock_irqrestore(&priv->lock, flags);
|
|
+
|
|
+ /* read/write actual message */
|
|
+ if (msg->flags & I2C_M_RD)
|
|
+ ret = falcon_i2c_rx(priv, ten_bit, msg->addr, msg->buf,
|
|
+ msg->len);
|
|
+ else
|
|
+ ret = falcon_i2c_tx(priv, ten_bit, msg->addr, msg->buf,
|
|
+ msg->len);
|
|
+
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int falcon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
|
|
+ int num)
|
|
+{
|
|
+ int i;
|
|
+ int ret;
|
|
+ unsigned long flags;
|
|
+ struct falcon_i2c *priv = i2c_get_adapdata(adap);
|
|
+
|
|
+ dev_dbg(priv->dev, "xfer %u messages\n", num);
|
|
+
|
|
+ /* transfer each message */
|
|
+ for (i = 0; i < num; i++) {
|
|
+#ifdef FALCON_FIX_ME
|
|
+ /* disable bus */
|
|
+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
|
|
+ /* enable bus */
|
|
+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
|
|
+#endif
|
|
+
|
|
+ /* clear bus status */
|
|
+ spin_lock_irqsave(&priv->lock, flags);
|
|
+ priv->status = 0;
|
|
+ spin_unlock_irqrestore(&priv->lock, flags);
|
|
+
|
|
+ /* wait for the bus to become ready */
|
|
+ ret = falcon_i2c_ready(priv);
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ /* transfer message */
|
|
+ ret = falcon_i2c_xfer_msg(priv, &msg[i]);
|
|
+
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ /* check for unhandled errors */
|
|
+ spin_lock_irqsave(&priv->lock, flags);
|
|
+ if (FALCON_I2C_ERROR(priv))
|
|
+ ret = priv->status;
|
|
+ spin_unlock_irqrestore(&priv->lock, flags);
|
|
+
|
|
+ if (ret) {
|
|
+ dev_warn(priv->dev, "message %u unhandled error 0x%x\n",
|
|
+ i, ret);
|
|
+
|
|
+ return ret;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static u32 falcon_i2c_func(struct i2c_adapter *adap)
|
|
+{
|
|
+ return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
|
|
+}
|
|
+
|
|
+static struct i2c_algorithm falcon_i2c_algorithm = {
|
|
+ .master_xfer = falcon_i2c_xfer,
|
|
+ .functionality = falcon_i2c_func,
|
|
+};
|
|
+
|
|
+static int falcon_i2c_hw_init(struct i2c_adapter *adap)
|
|
+{
|
|
+ struct falcon_i2c *priv = i2c_get_adapdata(adap);
|
|
+
|
|
+ /* disable bus */
|
|
+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
|
|
+
|
|
+ /* set normal operation clock divider */
|
|
+ i2c_w32(1 << I2C_CLC_RMC_OFFSET, clc);
|
|
+
|
|
+ /* set frequency */
|
|
+ if (priv->mode == FALCON_I2C_MODE_100) {
|
|
+ dev_dbg(priv->dev, "set standard mode (100 kHz)\n");
|
|
+
|
|
+ i2c_w32(0, fdiv_high_cfg);
|
|
+
|
|
+ i2c_w32((1 << I2C_FDIV_CFG_INC_OFFSET)
|
|
+ | (499 << I2C_FDIV_CFG_DEC_OFFSET),
|
|
+ fdiv_cfg);
|
|
+ } else if (priv->mode == FALCON_I2C_MODE_400) {
|
|
+ dev_dbg(priv->dev, "set fast mode (400 kHz)\n");
|
|
+
|
|
+ i2c_w32(0, fdiv_high_cfg);
|
|
+
|
|
+ i2c_w32((1 << I2C_FDIV_CFG_INC_OFFSET)
|
|
+ | (124 << I2C_FDIV_CFG_DEC_OFFSET),
|
|
+ fdiv_cfg);
|
|
+ } else if (priv->mode == FALCON_I2C_MODE_3400) {
|
|
+ dev_dbg(priv->dev, "set high mode (3.4 MHz)\n");
|
|
+
|
|
+ i2c_w32(0, fdiv_cfg);
|
|
+
|
|
+ /* TODO recalculate value for 100MHz input */
|
|
+ i2c_w32((41 << I2C_FDIV_CFG_INC_OFFSET)
|
|
+ | (152 << I2C_FDIV_CFG_DEC_OFFSET),
|
|
+ fdiv_high_cfg);
|
|
+ } else {
|
|
+ dev_warn(priv->dev, "unknown mode\n");
|
|
+
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ /* configure fifo */
|
|
+ i2c_w32(I2C_FIFO_CFG_TXFC /* tx fifo as flow controller */
|
|
+ | I2C_FIFO_CFG_RXFC /* rx fifo as flow controller */
|
|
+ | I2C_FIFO_CFG_TXFA_TXFA2 /* tx fifo 4-byte aligned */
|
|
+ | I2C_FIFO_CFG_RXFA_RXFA2 /* rx fifo 4-byte aligned */
|
|
+ | I2C_FIFO_CFG_TXBS_TXBS0 /* tx fifo burst size is 1 word */
|
|
+ | I2C_FIFO_CFG_RXBS_RXBS0, /* rx fifo burst size is 1 word */
|
|
+ fifo_cfg);
|
|
+
|
|
+ /* configure address */
|
|
+ falcon_addr_configure(priv, priv->ten_bit);
|
|
+
|
|
+ /* enable bus */
|
|
+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
|
|
+
|
|
+ /* mask burst interrupts */
|
|
+ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc);
|
|
+
|
|
+ /* enable interrupts */
|
|
+ i2c_w32(I2C_IMSC_LBREQ_INT_EN
|
|
+ | I2C_IMSC_BREQ_INT_EN
|
|
+ | I2C_IMSC_I2C_P_INT_EN
|
|
+ | I2C_IMSC_I2C_ERR_INT_EN,
|
|
+ imsc);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int __devinit falcon_i2c_probe(struct platform_device *pdev)
|
|
+{
|
|
+ int ret = 0;
|
|
+ struct falcon_i2c *priv;
|
|
+ struct i2c_adapter *adap;
|
|
+ struct resource *mmres, *ioarea,
|
|
+ *irqres_lb, *irqres_b, *irqres_err, *irqres_p;
|
|
+ struct clk *clk;
|
|
+
|
|
+ dev_dbg(&pdev->dev, "probing\n");
|
|
+
|
|
+ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ irqres_lb = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
|
|
+ "i2c_lb");
|
|
+ irqres_b = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "i2c_b");
|
|
+ irqres_err = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
|
|
+ "i2c_err");
|
|
+ irqres_p = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "i2c_p");
|
|
+
|
|
+ if (!mmres || !irqres_lb || !irqres_b || !irqres_err || !irqres_p) {
|
|
+ dev_err(&pdev->dev, "no resources\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ clk = clk_get(&pdev->dev, "fpi");
|
|
+ if (IS_ERR(clk)) {
|
|
+ dev_err(&pdev->dev, "failed to get fpi clk\n");
|
|
+ return -ENOENT;
|
|
+ }
|
|
+
|
|
+ if (clk_get_rate(clk) != 100000000) {
|
|
+ dev_err(&pdev->dev, "input clock is not 100MHz\n");
|
|
+ return -ENOENT;
|
|
+ }
|
|
+
|
|
+ /* allocate private data */
|
|
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
+ if (!priv) {
|
|
+ dev_err(&pdev->dev, "can't allocate private data\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ adap = &priv->adap;
|
|
+ i2c_set_adapdata(adap, priv);
|
|
+ adap->owner = THIS_MODULE;
|
|
+ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
|
|
+ strlcpy(adap->name, DRV_NAME "-adapter", sizeof(adap->name));
|
|
+ adap->algo = &falcon_i2c_algorithm;
|
|
+
|
|
+ priv->ten_bit = 0;
|
|
+ priv->mode = FALCON_I2C_MODE_100;
|
|
+ priv->clk = clk;
|
|
+ priv->dev = &pdev->dev;
|
|
+
|
|
+ spin_lock_init(&priv->lock);
|
|
+
|
|
+ ioarea = request_mem_region(mmres->start, resource_size(mmres),
|
|
+ pdev->name);
|
|
+
|
|
+ if (ioarea == NULL) {
|
|
+ dev_err(&pdev->dev, "I2C region already claimed\n");
|
|
+ ret = -ENXIO;
|
|
+ goto err_free_priv;
|
|
+ }
|
|
+
|
|
+ /* map memory */
|
|
+ priv->membase = ioremap_nocache(mmres->start & ~KSEG1,
|
|
+ resource_size(mmres));
|
|
+ if (priv->membase == NULL) {
|
|
+ ret = -ENOMEM;
|
|
+ goto err_release_region;
|
|
+ }
|
|
+
|
|
+ priv->irq_lb = irqres_lb->start;
|
|
+ ret = request_irq(priv->irq_lb, falcon_i2c_isr, IRQF_DISABLED,
|
|
+ irqres_lb->name, priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get last burst IRQ %d\n", irqres_lb->start);
|
|
+ ret = -ENODEV;
|
|
+ goto err_unmap_mem;
|
|
+ }
|
|
+
|
|
+ priv->irq_b = irqres_b->start;
|
|
+ ret = request_irq(priv->irq_b, falcon_i2c_isr, IRQF_DISABLED,
|
|
+ irqres_b->name, priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get burst IRQ %d\n", irqres_b->start);
|
|
+ ret = -ENODEV;
|
|
+ goto err_free_lb_irq;
|
|
+ }
|
|
+
|
|
+ priv->irq_err = irqres_err->start;
|
|
+ ret = request_irq(priv->irq_err, falcon_i2c_isr, IRQF_DISABLED,
|
|
+ irqres_err->name, priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get error IRQ %d\n", irqres_err->start);
|
|
+ ret = -ENODEV;
|
|
+ goto err_free_b_irq;
|
|
+ }
|
|
+
|
|
+ priv->irq_p = irqres_p->start;
|
|
+ ret = request_irq(priv->irq_p, falcon_i2c_isr, IRQF_DISABLED,
|
|
+ irqres_p->name, priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get protocol IRQ %d\n", irqres_p->start);
|
|
+ ret = -ENODEV;
|
|
+ goto err_free_err_irq;
|
|
+ }
|
|
+
|
|
+ dev_dbg(&pdev->dev, "mapped io-space to %p\n", priv->membase);
|
|
+ dev_dbg(&pdev->dev, "use IRQs %d, %d, %d, %d\n", irqres_lb->start,
|
|
+ irqres_b->start, irqres_err->start, irqres_p->start);
|
|
+
|
|
+ /* add our adapter to the i2c stack */
|
|
+ ret = i2c_add_numbered_adapter(adap);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't register I2C adapter\n");
|
|
+ goto err_free_p_irq;
|
|
+ }
|
|
+
|
|
+ platform_set_drvdata(pdev, priv);
|
|
+ i2c_set_adapdata(adap, priv);
|
|
+
|
|
+ /* print module version information */
|
|
+ dev_dbg(&pdev->dev, "module id=%u revision=%u\n",
|
|
+ (i2c_r32(id) & I2C_ID_ID_MASK) >> I2C_ID_ID_OFFSET,
|
|
+ (i2c_r32(id) & I2C_ID_REV_MASK) >> I2C_ID_REV_OFFSET);
|
|
+
|
|
+ init_completion(&priv->done);
|
|
+
|
|
+ /* initialize HW */
|
|
+ ret = falcon_i2c_hw_init(adap);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't configure adapter\n");
|
|
+ goto err_remove_adapter;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+err_remove_adapter:
|
|
+ i2c_del_adapter(adap);
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+err_free_p_irq:
|
|
+ free_irq(priv->irq_p, priv);
|
|
+
|
|
+err_free_err_irq:
|
|
+ free_irq(priv->irq_err, priv);
|
|
+
|
|
+err_free_b_irq:
|
|
+ free_irq(priv->irq_b, priv);
|
|
+
|
|
+err_free_lb_irq:
|
|
+ free_irq(priv->irq_lb, priv);
|
|
+
|
|
+err_unmap_mem:
|
|
+ iounmap(priv->membase);
|
|
+
|
|
+err_release_region:
|
|
+ release_mem_region(mmres->start, resource_size(mmres));
|
|
+
|
|
+err_free_priv:
|
|
+ kfree(priv);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit falcon_i2c_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct falcon_i2c *priv = platform_get_drvdata(pdev);
|
|
+ struct resource *mmres;
|
|
+
|
|
+ /* disable bus */
|
|
+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
|
|
+
|
|
+ /* remove driver */
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ i2c_del_adapter(&priv->adap);
|
|
+
|
|
+ free_irq(priv->irq_lb, priv);
|
|
+ free_irq(priv->irq_b, priv);
|
|
+ free_irq(priv->irq_err, priv);
|
|
+ free_irq(priv->irq_p, priv);
|
|
+
|
|
+ kfree(priv);
|
|
+
|
|
+ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ release_mem_region(mmres->start, resource_size(mmres));
|
|
+
|
|
+ dev_dbg(&pdev->dev, "removed\n");
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct platform_driver falcon_i2c_driver = {
|
|
+ .probe = falcon_i2c_probe,
|
|
+ .remove = __devexit_p(falcon_i2c_remove),
|
|
+ .driver = {
|
|
+ .name = DRV_NAME,
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init falcon_i2c_init(void)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ ret = platform_driver_register(&falcon_i2c_driver);
|
|
+
|
|
+ if (ret)
|
|
+ printk(KERN_DEBUG DRV_NAME ": can't register platform driver");
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static void __exit falcon_i2c_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&falcon_i2c_driver);
|
|
+}
|
|
+
|
|
+module_init(falcon_i2c_init);
|
|
+module_exit(falcon_i2c_exit);
|
|
+
|
|
+MODULE_DESCRIPTION("Lantiq FALC(tm) ON - I2C bus adapter");
|
|
+MODULE_ALIAS("platform:i2c_falcon");
|
|
+MODULE_LICENSE("GPL");
|