anierin/msm-5.15
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i2c: i2c-msm-geni: i2c-hub support for kalama

Browse Source 
I2C master hub is a core which has a group of serial engines and
io_macros, which have reduced capabilities compared to qupv3 serial
engines and IO macros. It supports only I2C protocol and doesn't
support QUP related capabilities like GSI, DMA mode and AHB interface.

This change adds required code changes for i2c hub into existing GENI
i2c driver and takes care of eliminating not supported functions.

Change-Id: I40d3f99068e98ce6930786e0d990f7cc956d151f
Signed-off-by: aveshala <quic_aveshala@quicinc.com>
This commit is contained in:
aveshala
2021-12-28 01:08:02 -08:00
committed by Anvesh Salveru
parent 2eebd7f90f
commit da6f10d4e4
1 changed files with 62 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
drivers/i2c/busses/i2c-msm-geni.c
View File

@@ -63,12 +63,16 @@
#define GENI_ABORT_DONE 8
#define GENI_TIMEOUT 9
#define GENI_HW_PARAM 0x50
#define I2C_NACK GP_IRQ1
#define I2C_BUS_PROTO GP_IRQ3
#define I2C_ARB_LOST GP_IRQ4
#define DM_I2C_CB_ERR ((BIT(GP_IRQ1) | BIT(GP_IRQ3) | BIT(GP_IRQ4)) \
<< 5)
#define I2C_MASTER_HUB (BIT(0))
#define KHz(freq) (1000 * freq)
#define I2C_AUTO_SUSPEND_DELAY 250
@@ -164,6 +168,7 @@ struct geni_i2c_dev {
bool req_chan;
bool first_resume;
bool gpi_reset;
bool is_i2c_hub;
};
static struct geni_i2c_dev *gi2c_dev_dbg[MAX_SE];
@@ -369,7 +374,12 @@ static int geni_i2c_prepare(struct geni_i2c_dev *gi2c)
I2C_LOG_DBG(gi2c->ipcl, false, gi2c->dev,
"i2c in GSI ONLY mode\n");
} else {
int gi2c_tx_depth = geni_se_get_tx_fifo_depth(&gi2c->i2c_rsc);
int gi2c_tx_depth;
if (!gi2c->is_i2c_hub)
gi2c_tx_depth = geni_se_get_tx_fifo_depth(&gi2c->i2c_rsc);
else
gi2c_tx_depth = 16; /* i2c hub depth is fixed to 16 */
gi2c->se_mode = FIFO_SE_DMA;
@@ -1136,7 +1146,11 @@ static int geni_i2c_xfer(struct i2c_adapter *adap,
gi2c->cur = &msgs[i];
qcom_geni_i2c_calc_timeout(gi2c);
mode = msgs[i].len > 32 ? GENI_SE_DMA : GENI_SE_FIFO;
if (!gi2c->is_i2c_hub)
mode = msgs[i].len > 32 ? GENI_SE_DMA : GENI_SE_FIFO;
else
mode = GENI_SE_FIFO; /* i2c hub has only FIFO mode */
geni_se_select_mode(&gi2c->i2c_rsc, mode);
@@ -1273,6 +1287,27 @@ static const struct i2c_algorithm geni_i2c_algo = {
.functionality = geni_i2c_func,
};
static int get_geni_se_i2c_hub(struct geni_i2c_dev *gi2c)
{
int ret = 0;
int geni_hw_param;
ret = geni_se_common_clks_on(gi2c->i2c_rsc.clk, gi2c->m_ahb_clk, gi2c->s_ahb_clk);
if (ret) {
dev_err(gi2c->dev, "%s: Err in geni_se_clks_on %d\n", __func__, ret);
return ret;
}
geni_hw_param = geni_read_reg(gi2c->base, GENI_HW_PARAM);
if (geni_hw_param & I2C_MASTER_HUB)
gi2c->is_i2c_hub = true;
else
gi2c->is_i2c_hub = false;
geni_se_common_clks_off(gi2c->i2c_rsc.clk, gi2c->m_ahb_clk, gi2c->s_ahb_clk);
return ret;
}
static int geni_i2c_probe(struct platform_device *pdev)
{
struct geni_i2c_dev *gi2c;
@@ -1351,13 +1386,35 @@ static int geni_i2c_probe(struct platform_device *pdev)
return ret;
}
ret = geni_se_common_resources_init(&gi2c->i2c_rsc, GENI_DEFAULT_BW,
GENI_DEFAULT_BW, Bps_to_icc(gi2c->clk_freq_out));
ret = get_geni_se_i2c_hub(gi2c);
if (ret) {
dev_err(&pdev->dev, "Error geni_se_common_resources_init\n");
dev_err(&pdev->dev, "failing at get_geni_se_i2c_hub %d\n", ret);
return ret;
}
/*
* For I2C_HUB, qup-ddr voting not required.
*/
if (gi2c->is_i2c_hub) {
ret = geni_icc_get(&gi2c->i2c_rsc, NULL);
if (ret) {
dev_err(&pdev->dev, "%s: Error - geni_icc_get ret:%d\n",
__func__, ret);
return ret;
}
gi2c->i2c_rsc.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
gi2c->i2c_rsc.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
} else {
ret = geni_se_common_resources_init(&gi2c->i2c_rsc,
GENI_DEFAULT_BW, GENI_DEFAULT_BW,
Bps_to_icc(gi2c->clk_freq_out));
if (ret) {
dev_err(&pdev->dev, "%s: Error - resources_init ret:%d\n",
__func__, ret);
return ret;
}
}
gi2c->irq = platform_get_irq(pdev, 0);
if (gi2c->irq < 0)
return gi2c->irq;