Ben, Did you happen to look at this ? > -----Original Message----- > From: Shilimkar, Santosh > Sent: Friday, February 19, 2010 10:03 PM > To: ben-linux@xxxxxxxxx > Cc: linux-omap@xxxxxxxxxxxxxxx; linux-i2c@xxxxxxxxxxxxxxx; Shilimkar, Santosh; Syed, Rafiuddin; Cory > Maccarrone > Subject: [PATCH] omap: i2c: Add i2c support on omap4 platform > > This patch is rebased version of earlier post to add I2C > driver support to OMAP4 platform. On OMAP4, all > I2C register address offsets are changed from OMAP1/2/3 I2C. > In order to not have #ifdef's at various places in code, > as well as to support multi-OMAP build, an array is created > to hold the register addresses with it's offset. > > This patch was submitted, reviewed and acked on mailing list > already. For more details refer below link > http://www.mail-archive.com/linux-i2c@xxxxxxxxxxxxxxx/msg02281.html > > This updated verion has a depedancy on "Add support for 16-bit registers" > posted on linux-omap. Below is the patch-works link for the same > > http://patchwork.kernel.org/patch/72295/ > > Signed-off-by: Syed Rafiuddin <rafiuddin.syed@xxxxxx> > Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx> > Acked-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx> > Reviewed-by: Paul Walmsley <paul@xxxxxxxxx> > Reviewed-by: Tony Lindgren <tony@xxxxxxxxxxx> > Cc: Ben Dooks <ben-linux@xxxxxxxxx> > Cc: Cory Maccarrone <darkstar6262@xxxxxxxxx> > --- > drivers/i2c/busses/i2c-omap.c | 146 ++++++++++++++++++++++++++++++++--------- > 1 files changed, 114 insertions(+), 32 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c > index 9c3ce4d..7c15496 100644 > --- a/drivers/i2c/busses/i2c-omap.c > +++ b/drivers/i2c/busses/i2c-omap.c > @@ -44,29 +44,37 @@ > /* I2C controller revisions present on specific hardware */ > #define OMAP_I2C_REV_ON_2430 0x36 > #define OMAP_I2C_REV_ON_3430 0x3C > +#define OMAP_I2C_REV_ON_4430 0x40 > > /* timeout waiting for the controller to respond */ > #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) > > -#define OMAP_I2C_REV_REG 0x00 > -#define OMAP_I2C_IE_REG 0x01 > -#define OMAP_I2C_STAT_REG 0x02 > -#define OMAP_I2C_IV_REG 0x03 > /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ > -#define OMAP_I2C_WE_REG 0x03 > -#define OMAP_I2C_SYSS_REG 0x04 > -#define OMAP_I2C_BUF_REG 0x05 > -#define OMAP_I2C_CNT_REG 0x06 > -#define OMAP_I2C_DATA_REG 0x07 > -#define OMAP_I2C_SYSC_REG 0x08 > -#define OMAP_I2C_CON_REG 0x09 > -#define OMAP_I2C_OA_REG 0x0a > -#define OMAP_I2C_SA_REG 0x0b > -#define OMAP_I2C_PSC_REG 0x0c > -#define OMAP_I2C_SCLL_REG 0x0d > -#define OMAP_I2C_SCLH_REG 0x0e > -#define OMAP_I2C_SYSTEST_REG 0x0f > -#define OMAP_I2C_BUFSTAT_REG 0x10 > +enum { > + OMAP_I2C_REV_REG = 0, > + OMAP_I2C_IE_REG, > + OMAP_I2C_STAT_REG, > + OMAP_I2C_IV_REG, > + OMAP_I2C_WE_REG, > + OMAP_I2C_SYSS_REG, > + OMAP_I2C_BUF_REG, > + OMAP_I2C_CNT_REG, > + OMAP_I2C_DATA_REG, > + OMAP_I2C_SYSC_REG, > + OMAP_I2C_CON_REG, > + OMAP_I2C_OA_REG, > + OMAP_I2C_SA_REG, > + OMAP_I2C_PSC_REG, > + OMAP_I2C_SCLL_REG, > + OMAP_I2C_SCLH_REG, > + OMAP_I2C_SYSTEST_REG, > + OMAP_I2C_BUFSTAT_REG, > + OMAP_I2C_REVNB_LO, > + OMAP_I2C_REVNB_HI, > + OMAP_I2C_IRQSTATUS_RAW, > + OMAP_I2C_IRQENABLE_SET, > + OMAP_I2C_IRQENABLE_CLR, > +}; > > /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ > #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ > @@ -169,6 +177,7 @@ struct omap_i2c_dev { > u32 speed; /* Speed of bus in Khz */ > u16 cmd_err; > u8 *buf; > + u8 *regs; > size_t buf_len; > struct i2c_adapter adapter; > u8 fifo_size; /* use as flag and value > @@ -187,15 +196,64 @@ struct omap_i2c_dev { > u16 westate; > }; > > +const static u8 reg_map[] = { > + [OMAP_I2C_REV_REG] = 0x00, > + [OMAP_I2C_IE_REG] = 0x01, > + [OMAP_I2C_STAT_REG] = 0x02, > + [OMAP_I2C_IV_REG] = 0x03, > + [OMAP_I2C_WE_REG] = 0x03, > + [OMAP_I2C_SYSS_REG] = 0x04, > + [OMAP_I2C_BUF_REG] = 0x05, > + [OMAP_I2C_CNT_REG] = 0x06, > + [OMAP_I2C_DATA_REG] = 0x07, > + [OMAP_I2C_SYSC_REG] = 0x08, > + [OMAP_I2C_CON_REG] = 0x09, > + [OMAP_I2C_OA_REG] = 0x0a, > + [OMAP_I2C_SA_REG] = 0x0b, > + [OMAP_I2C_PSC_REG] = 0x0c, > + [OMAP_I2C_SCLL_REG] = 0x0d, > + [OMAP_I2C_SCLH_REG] = 0x0e, > + [OMAP_I2C_SYSTEST_REG] = 0x0f, > + [OMAP_I2C_BUFSTAT_REG] = 0x10, > +}; > + > +const static u8 omap4_reg_map[] = { > + [OMAP_I2C_REV_REG] = 0x04, > + [OMAP_I2C_IE_REG] = 0x2c, > + [OMAP_I2C_STAT_REG] = 0x28, > + [OMAP_I2C_IV_REG] = 0x34, > + [OMAP_I2C_WE_REG] = 0x34, > + [OMAP_I2C_SYSS_REG] = 0x90, > + [OMAP_I2C_BUF_REG] = 0x94, > + [OMAP_I2C_CNT_REG] = 0x98, > + [OMAP_I2C_DATA_REG] = 0x9c, > + [OMAP_I2C_SYSC_REG] = 0x20, > + [OMAP_I2C_CON_REG] = 0xa4, > + [OMAP_I2C_OA_REG] = 0xa8, > + [OMAP_I2C_SA_REG] = 0xac, > + [OMAP_I2C_PSC_REG] = 0xb0, > + [OMAP_I2C_SCLL_REG] = 0xb4, > + [OMAP_I2C_SCLH_REG] = 0xb8, > + [OMAP_I2C_SYSTEST_REG] = 0xbC, > + [OMAP_I2C_BUFSTAT_REG] = 0xc0, > + [OMAP_I2C_REVNB_LO] = 0x00, > + [OMAP_I2C_REVNB_HI] = 0x04, > + [OMAP_I2C_IRQSTATUS_RAW] = 0x24, > + [OMAP_I2C_IRQENABLE_SET] = 0x2c, > + [OMAP_I2C_IRQENABLE_CLR] = 0x30, > +}; > + > static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, > int reg, u16 val) > { > - __raw_writew(val, i2c_dev->base + (reg << i2c_dev->reg_shift)); > + __raw_writew(val, i2c_dev->base + > + (i2c_dev->regs[reg] << i2c_dev->reg_shift)); > } > > static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) > { > - return __raw_readw(i2c_dev->base + (reg << i2c_dev->reg_shift)); > + return __raw_readw(i2c_dev->base + > + (i2c_dev->regs[reg] << i2c_dev->reg_shift)); > } > > static int __init omap_i2c_get_clocks(struct omap_i2c_dev *dev) > @@ -264,7 +322,11 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev) > WARN_ON(dev->idle); > > dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); > - omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); > + if (dev->rev >= OMAP_I2C_REV_ON_4430) > + omap_i2c_write_reg(dev, OMAP_I2C_IRQENABLE_CLR, 1); > + else > + omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); > + > if (dev->rev < OMAP_I2C_REV_2) { > iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); /* Read clears */ > } else { > @@ -329,7 +391,9 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) > * REVISIT: Some wkup sources might not be needed. > */ > dev->westate = OMAP_I2C_WE_ALL; > - omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate); > + if (dev->rev < OMAP_I2C_REV_ON_4430) > + omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, > + dev->westate); > } > } > omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); > @@ -356,7 +420,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) > psc = fclk_rate / 12000000; > } > > - if (cpu_is_omap2430() || cpu_is_omap34xx()) { > + if (!(cpu_class_is_omap1() || cpu_is_omap2420())) { > > /* > * HSI2C controller internal clk rate should be 19.2 Mhz for > @@ -746,9 +810,12 @@ complete: > if (dev->buf_len) { > *dev->buf++ = w; > dev->buf_len--; > - /* Data reg from 2430 is 8 bit wide */ > - if (!cpu_is_omap2430() && > - !cpu_is_omap34xx()) { > + /* > + * Data reg in 2430, omap3 and > + * omap4 is 8 bit wide > + */ > + if (cpu_class_is_omap1() || > + cpu_is_omap2420()) { > if (dev->buf_len) { > *dev->buf++ = w >> 8; > dev->buf_len--; > @@ -786,9 +853,12 @@ complete: > if (dev->buf_len) { > w = *dev->buf++; > dev->buf_len--; > - /* Data reg from 2430 is 8 bit wide */ > - if (!cpu_is_omap2430() && > - !cpu_is_omap34xx()) { > + /* > + * Data reg in 2430, omap3 and > + * omap4 is 8 bit wide > + */ > + if (cpu_class_is_omap1() || > + cpu_is_omap2420()) { > if (dev->buf_len) { > w |= *dev->buf++ << 8; > dev->buf_len--; > @@ -897,6 +967,8 @@ omap_i2c_probe(struct platform_device *pdev) > > if (cpu_is_omap7xx()) > dev->reg_shift = 1; > + else if (cpu_is_omap44xx()) > + dev->reg_shift = 0; > else > dev->reg_shift = 2; > > @@ -911,11 +983,16 @@ omap_i2c_probe(struct platform_device *pdev) > if ((r = omap_i2c_get_clocks(dev)) != 0) > goto err_iounmap; > > + if (cpu_is_omap44xx()) > + dev->regs = (u8 *) omap4_reg_map; > + else > + dev->regs = (u8 *) reg_map; > + > omap_i2c_unidle(dev); > > dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; > > - if (cpu_is_omap2430() || cpu_is_omap34xx()) { > + if (!(cpu_class_is_omap1() || cpu_is_omap2420())) { > u16 s; > > /* Set up the fifo size - Get total size */ > @@ -927,8 +1004,13 @@ omap_i2c_probe(struct platform_device *pdev) > * size. This is to ensure that we can handle the status on int > * call back latencies. > */ > - dev->fifo_size = (dev->fifo_size / 2); > - dev->b_hw = 1; /* Enable hardware fixes */ > + if (dev->rev >= OMAP_I2C_REV_ON_4430) { > + dev->fifo_size = 0; > + dev->b_hw = 0; /* Disable hardware fixes */ > + } else { > + dev->fifo_size = (dev->fifo_size / 2); > + dev->b_hw = 1; /* Enable hardware fixes */ > + } > } > > /* reset ASAP, clearing any IRQs */ > -- > 1.6.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
