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i2c: qcom-geni: add desc struct to prepare support for I2C Master Hub variant 

The I2C Master Hub is a stripped down version of the GENI Serial Engine
QUP Wrapper Controller but only supporting I2C serial engines without
DMA support.

Those I2C serial engines variants have some requirements:
- a separate "core" clock
- doesn't support DMA, thus no memory interconnect path
- fixed FIFO size not discoverable in the HW_PARAM_0 register

Add a desc struct specifying all those requirements which will be used in
a next change when adding the I2C Master Hub serial engine compatible.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Neil Armstrong 2022-11-29 15:47:05 +01:00 committed by Wolfram Sang
parent f4aba01db4
commit 14d02fbadb
1 changed files with 47 additions and 3 deletions
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50
drivers/i2c/busses/i2c-qcom-geni.c
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@ -88,6 +88,7 @@ struct geni_i2c_dev {
int cur_wr;
int cur_rd;
spinlock_t lock;
struct clk *core_clk;
u32 clk_freq_out;
const struct geni_i2c_clk_fld *clk_fld;
int suspended;
@ -100,6 +101,13 @@ struct geni_i2c_dev {
bool abort_done;
};
struct geni_i2c_desc {
bool has_core_clk;
char *icc_ddr;
bool no_dma_support;
unsigned int tx_fifo_depth;
};
struct geni_i2c_err_log {
int err;
const char *msg;
@ -764,6 +772,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
u32 proto, tx_depth, fifo_disable;
int ret;
struct device *dev = &pdev->dev;
const struct geni_i2c_desc *desc = NULL;
gi2c = devm_kzalloc(dev, sizeof(*gi2c), GFP_KERNEL);
if (!gi2c)
@ -776,6 +785,14 @@ static int geni_i2c_probe(struct platform_device *pdev)
if (IS_ERR(gi2c->se.base))
return PTR_ERR(gi2c->se.base);
desc = device_get_match_data(&pdev->dev);
if (desc && desc->has_core_clk) {
gi2c->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(gi2c->core_clk))
return PTR_ERR(gi2c->core_clk);
}
gi2c->se.clk = devm_clk_get(dev, "se");
if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(dev))
return PTR_ERR(gi2c->se.clk);
@ -819,7 +836,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
gi2c->adap.dev.of_node = dev->of_node;
strscpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));
ret = geni_icc_get(&gi2c->se, "qup-memory");
ret = geni_icc_get(&gi2c->se, desc ? desc->icc_ddr : "qup-memory");
if (ret)
return ret;
/*
@ -829,12 +846,17 @@ static int geni_i2c_probe(struct platform_device *pdev)
*/
gi2c->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
gi2c->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
if (!desc || desc->icc_ddr)
gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
ret = geni_icc_set_bw(&gi2c->se);
if (ret)
return ret;
ret = clk_prepare_enable(gi2c->core_clk);
if (ret)
return ret;
ret = geni_se_resources_on(&gi2c->se);
if (ret) {
dev_err(dev, "Error turning on resources %d\n", ret);
@ -844,10 +866,15 @@ static int geni_i2c_probe(struct platform_device *pdev)
if (proto != GENI_SE_I2C) {
dev_err(dev, "Invalid proto %d\n", proto);
geni_se_resources_off(&gi2c->se);
clk_disable_unprepare(gi2c->core_clk);
return -ENXIO;
}
fifo_disable = readl_relaxed(gi2c->se.base + GENI_IF_DISABLE_RO) & FIFO_IF_DISABLE;
if (desc && desc->no_dma_support)
fifo_disable = false;
else
fifo_disable = readl_relaxed(gi2c->se.base + GENI_IF_DISABLE_RO) & FIFO_IF_DISABLE;
if (fifo_disable) {
/* FIFO is disabled, so we can only use GPI DMA */
gi2c->gpi_mode = true;
@ -859,6 +886,16 @@ static int geni_i2c_probe(struct platform_device *pdev)
} else {
gi2c->gpi_mode = false;
tx_depth = geni_se_get_tx_fifo_depth(&gi2c->se);
/* I2C Master Hub Serial Elements doesn't have the HW_PARAM_0 register */
if (!tx_depth && desc)
tx_depth = desc->tx_fifo_depth;
if (!tx_depth) {
dev_err(dev, "Invalid TX FIFO depth\n");
return -EINVAL;
}
gi2c->tx_wm = tx_depth - 1;
geni_se_init(&gi2c->se, gi2c->tx_wm, tx_depth);
geni_se_config_packing(&gi2c->se, BITS_PER_BYTE,
@ -867,6 +904,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
dev_dbg(dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
}
clk_disable_unprepare(gi2c->core_clk);
ret = geni_se_resources_off(&gi2c->se);
if (ret) {
dev_err(dev, "Error turning off resources %d\n", ret);
@ -932,6 +970,8 @@ static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
gi2c->suspended = 1;
}
clk_disable_unprepare(gi2c->core_clk);
return geni_icc_disable(&gi2c->se);
}
@ -944,6 +984,10 @@ static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
if (ret)
return ret;
ret = clk_prepare_enable(gi2c->core_clk);
if (ret)
return ret;
ret = geni_se_resources_on(&gi2c->se);
if (ret)
return ret;