From 2090ad6052d0241bce169c0448a23914f6da25b0 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Tue, 14 Oct 2008 06:19:48 -0600 Subject: [PATCH] OMAP2/3 I2C: reprogram OCP_SYSCONFIG register after reset The I2C controller clears its OCP_SYSCONFIG register after an OCP soft reset. Reprogram OCP_SYSCONFIG for maximum power savings on rev3.6 controllers and beyond. On 2430, this involves setting the module AUTOIDLE bit. On 3430, this includes module AUTOIDLE, wakeup enable, slave smart-idle, and considers only the module functional clock state for idle-ack. Boot-tested on 2430SDP and 3430SDP. Signed-off-by: Paul Walmsley Cc: Richard Woodruff Signed-off-by: Tony Lindgren --- drivers/i2c/busses/i2c-omap.c | 40 +++++++++++++++++++++++++++++------ 1 file changed, 34 insertions(+), 6 deletions(-) diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index 3ac510d9c9b..b2023541587 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -123,11 +123,19 @@ #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ #endif -/* I2C System Status register (OMAP_I2C_SYSS): */ -#define OMAP_I2C_SYSS_RDONE (1 << 0) /* Reset Done */ +/* OCP_SYSSTATUS bit definitions */ +#define SYSS_RESETDONE_MASK (1 << 0) + +/* OCP_SYSCONFIG bit definitions */ +#define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) +#define SYSC_SIDLEMODE_MASK (0x3 << 3) +#define SYSC_ENAWAKEUP_MASK (1 << 2) +#define SYSC_SOFTRESET_MASK (1 << 1) +#define SYSC_AUTOIDLE_MASK (1 << 0) + +#define SYSC_IDLEMODE_SMART 0x2 +#define SYSC_CLOCKACTIVITY_FCLK 0x2 -/* I2C System Configuration Register (OMAP_I2C_SYSC): */ -#define OMAP_I2C_SYSC_SRST (1 << 1) /* Soft Reset */ struct omap_i2c_dev { struct device *dev; @@ -239,13 +247,13 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long internal_clk = 0; if (dev->rev >= OMAP_I2C_REV_2) { - omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST); + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); /* For some reason we need to set the EN bit before the * reset done bit gets set. */ timeout = jiffies + OMAP_I2C_TIMEOUT; omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & - OMAP_I2C_SYSS_RDONE)) { + SYSS_RESETDONE_MASK)) { if (time_after(jiffies, timeout)) { dev_warn(dev->dev, "timeout waiting " "for controller reset\n"); @@ -253,6 +261,26 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) } msleep(1); } + + /* SYSC register is cleared by the reset; rewrite it */ + if (dev->rev == OMAP_I2C_REV_ON_2430) { + + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, + SYSC_AUTOIDLE_MASK); + + } else if (dev->rev >= OMAP_I2C_REV_ON_3430) { + u32 v; + + v = SYSC_AUTOIDLE_MASK; + v |= SYSC_ENAWAKEUP_MASK; + v |= (SYSC_IDLEMODE_SMART << + __ffs(SYSC_SIDLEMODE_MASK)); + v |= (SYSC_CLOCKACTIVITY_FCLK << + __ffs(SYSC_CLOCKACTIVITY_MASK)); + + omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v); + + } } omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); -- 2.41.1