i2c-omap: Enable I2C wakeups for 34xx
I2C_WE registers were not configured, which caused huge delays in I2C operations while cpu idle was enabled and omap entered WFI. This patch enables all I2C wakeup sources. Signed-off-by: Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
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@ -52,6 +52,8 @@
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#define OMAP_I2C_IE_REG 0x04
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#define OMAP_I2C_STAT_REG 0x08
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#define OMAP_I2C_IV_REG 0x0c
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/* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
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#define OMAP_I2C_WE_REG 0x0c
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#define OMAP_I2C_SYSS_REG 0x10
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#define OMAP_I2C_BUF_REG 0x14
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#define OMAP_I2C_CNT_REG 0x18
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@ -89,6 +91,24 @@
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#define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */
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#define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */
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/* I2C WE wakeup enable register */
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#define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */
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#define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */
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#define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/
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#define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */
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#define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */
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#define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */
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#define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */
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#define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */
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#define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */
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#define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */
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#define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \
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OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \
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OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \
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OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \
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OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE)
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/* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
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#define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */
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#define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */
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@ -279,6 +299,13 @@ static int omap_i2c_init(struct omap_i2c_dev *dev)
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__ffs(SYSC_CLOCKACTIVITY_MASK));
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omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, v);
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/*
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* Enabling all wakup sources to stop I2C freezing on
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* WFI instruction.
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* REVISIT: Some wkup sources might not be needed.
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*/
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omap_i2c_write_reg(dev, OMAP_I2C_WE_REG,
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OMAP_I2C_WE_ALL);
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}
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}
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