diff options
Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index f6d760581fa..bd9867f592b 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -32,6 +32,8 @@ ACPI_MODULE_NAME("acpi_lpss"); #define LPSS_GENERAL_LTR_MODE_SW BIT(2) #define LPSS_SW_LTR 0x10 #define LPSS_AUTO_LTR 0x14 +#define LPSS_TX_INT 0x20 +#define LPSS_TX_INT_MASK BIT(1) struct lpss_shared_clock { const char *name; @@ -39,6 +41,8 @@ struct lpss_shared_clock { struct clk *clk; }; +struct lpss_private_data; + struct lpss_device_desc { bool clk_required; const char *clkdev_name; @@ -46,6 +50,7 @@ struct lpss_device_desc { unsigned int prv_offset; bool clk_gate; struct lpss_shared_clock *shared_clock; + void (*setup)(struct lpss_private_data *pdata); }; static struct lpss_device_desc lpss_dma_desc = { @@ -60,6 +65,15 @@ struct lpss_private_data { const struct lpss_device_desc *dev_desc; }; +static void lpss_uart_setup(struct lpss_private_data *pdata) +{ + unsigned int tx_int_offset = pdata->dev_desc->prv_offset + LPSS_TX_INT; + u32 reg; + + reg = readl(pdata->mmio_base + tx_int_offset); + writel(reg | LPSS_TX_INT_MASK, pdata->mmio_base + tx_int_offset); +} + static struct lpss_device_desc lpt_dev_desc = { .clk_required = true, .prv_offset = 0x800, @@ -67,6 +81,14 @@ static struct lpss_device_desc lpt_dev_desc = { .clk_gate = true, }; +static struct lpss_device_desc lpt_uart_dev_desc = { + .clk_required = true, + .prv_offset = 0x800, + .ltr_required = true, + .clk_gate = true, + .setup = lpss_uart_setup, +}; + static struct lpss_device_desc lpt_sdio_dev_desc = { .prv_offset = 0x1000, .ltr_required = true, @@ -82,6 +104,7 @@ static struct lpss_device_desc byt_uart_dev_desc = { .prv_offset = 0x800, .clk_gate = true, .shared_clock = &uart_clock, + .setup = lpss_uart_setup, }; static struct lpss_shared_clock spi_clock = { @@ -120,8 +143,8 @@ static const struct acpi_device_id acpi_lpss_device_ids[] = { { "INT33C1", (unsigned long)&lpt_dev_desc }, { "INT33C2", (unsigned long)&lpt_dev_desc }, { "INT33C3", (unsigned long)&lpt_dev_desc }, - { "INT33C4", (unsigned long)&lpt_dev_desc }, - { "INT33C5", (unsigned long)&lpt_dev_desc }, + { "INT33C4", (unsigned long)&lpt_uart_dev_desc }, + { "INT33C5", (unsigned long)&lpt_uart_dev_desc }, { "INT33C6", (unsigned long)&lpt_sdio_dev_desc }, { "INT33C7", }, @@ -247,6 +270,9 @@ static int acpi_lpss_create_device(struct acpi_device *adev, } } + if (dev_desc->setup) + dev_desc->setup(pdata); + adev->driver_data = pdata; ret = acpi_create_platform_device(adev, id); if (ret > 0) |