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path: root/drivers/acpi/acpi_lpss.c
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Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
-rw-r--r--drivers/acpi/acpi_lpss.c88
1 files changed, 81 insertions, 7 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 652fd5ce303c..f6d760581faa 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -33,11 +33,19 @@ ACPI_MODULE_NAME("acpi_lpss");
#define LPSS_SW_LTR 0x10
#define LPSS_AUTO_LTR 0x14
+struct lpss_shared_clock {
+ const char *name;
+ unsigned long rate;
+ struct clk *clk;
+};
+
struct lpss_device_desc {
bool clk_required;
const char *clkdev_name;
bool ltr_required;
unsigned int prv_offset;
+ bool clk_gate;
+ struct lpss_shared_clock *shared_clock;
};
static struct lpss_device_desc lpss_dma_desc = {
@@ -56,6 +64,7 @@ static struct lpss_device_desc lpt_dev_desc = {
.clk_required = true,
.prv_offset = 0x800,
.ltr_required = true,
+ .clk_gate = true,
};
static struct lpss_device_desc lpt_sdio_dev_desc = {
@@ -63,6 +72,45 @@ static struct lpss_device_desc lpt_sdio_dev_desc = {
.ltr_required = true,
};
+static struct lpss_shared_clock uart_clock = {
+ .name = "uart_clk",
+ .rate = 44236800,
+};
+
+static struct lpss_device_desc byt_uart_dev_desc = {
+ .clk_required = true,
+ .prv_offset = 0x800,
+ .clk_gate = true,
+ .shared_clock = &uart_clock,
+};
+
+static struct lpss_shared_clock spi_clock = {
+ .name = "spi_clk",
+ .rate = 50000000,
+};
+
+static struct lpss_device_desc byt_spi_dev_desc = {
+ .clk_required = true,
+ .prv_offset = 0x400,
+ .clk_gate = true,
+ .shared_clock = &spi_clock,
+};
+
+static struct lpss_device_desc byt_sdio_dev_desc = {
+ .clk_required = true,
+};
+
+static struct lpss_shared_clock i2c_clock = {
+ .name = "i2c_clk",
+ .rate = 100000000,
+};
+
+static struct lpss_device_desc byt_i2c_dev_desc = {
+ .clk_required = true,
+ .prv_offset = 0x800,
+ .shared_clock = &i2c_clock,
+};
+
static const struct acpi_device_id acpi_lpss_device_ids[] = {
/* Generic LPSS devices */
{ "INTL9C60", (unsigned long)&lpss_dma_desc },
@@ -77,6 +125,13 @@ static const struct acpi_device_id acpi_lpss_device_ids[] = {
{ "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
{ "INT33C7", },
+ /* BayTrail LPSS devices */
+ { "80860F0A", (unsigned long)&byt_uart_dev_desc },
+ { "80860F0E", (unsigned long)&byt_spi_dev_desc },
+ { "80860F14", (unsigned long)&byt_sdio_dev_desc },
+ { "80860F41", (unsigned long)&byt_i2c_dev_desc },
+ { "INT33B2", },
+
{ }
};
@@ -98,7 +153,10 @@ static int register_device_clock(struct acpi_device *adev,
struct lpss_private_data *pdata)
{
const struct lpss_device_desc *dev_desc = pdata->dev_desc;
+ struct lpss_shared_clock *shared_clock = dev_desc->shared_clock;
+ struct clk *clk = ERR_PTR(-ENODEV);
struct lpss_clk_data *clk_data;
+ const char *parent;
if (!lpss_clk_dev)
lpt_register_clock_device();
@@ -117,14 +175,30 @@ static int register_device_clock(struct acpi_device *adev,
|| pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
return -ENODATA;
- pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev),
- clk_data->name, 0,
- pdata->mmio_base + dev_desc->prv_offset,
- 0, 0, NULL);
- if (IS_ERR(pdata->clk))
- return PTR_ERR(pdata->clk);
+ parent = clk_data->name;
+
+ if (shared_clock) {
+ clk = shared_clock->clk;
+ if (!clk) {
+ clk = clk_register_fixed_rate(NULL, shared_clock->name,
+ "lpss_clk", 0,
+ shared_clock->rate);
+ shared_clock->clk = clk;
+ }
+ parent = shared_clock->name;
+ }
+
+ if (dev_desc->clk_gate) {
+ clk = clk_register_gate(NULL, dev_name(&adev->dev), parent, 0,
+ pdata->mmio_base + dev_desc->prv_offset,
+ 0, 0, NULL);
+ pdata->clk = clk;
+ }
+
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
- clk_register_clkdev(pdata->clk, NULL, dev_name(&adev->dev));
+ clk_register_clkdev(clk, NULL, dev_name(&adev->dev));
return 0;
}