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authorFeng Tang <feng.tang@intel.com>2010-07-27 11:20:22 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-11 00:47:46 +0400
commitd843fc6e9dc9bee7061b6833594860ea93ad98e1 (patch)
tree825f25909de7b4056a5c8e4180b2068fff339070 /include
parent464eb8f596fcbdadcfbbdb4a84847ffcb93cc4dd (diff)
downloadlinux-d843fc6e9dc9bee7061b6833594860ea93ad98e1.tar.xz
hsu: driver for Medfield High Speed UART device
This is a PCI & UART driver, which suppors both PIO and DMA mode UART operation. It has 3 identical UART ports and one internal DMA controller. Current FW will export 4 pci devices for hsu: 3 uart ports and 1 dma controller, each has one IRQ line. And we need to discuss the device model, one PCI device covering whole HSU should be a better model, but there is a problem of how to export the 4 IRQs info Current driver set the highest baud rate to 2746800bps, which is easy to scale down to 115200/230400.... To suport higher baud rate, we need add special process, change DLAB/DLH/PS/DIV/MUL registers all together. 921600 is the highest baud rate that has been tested with Bluetooth modem connected to HSU port 0. Will test more when there is right BT firmware. Current version contains several work around for A0's Silicon bugs Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/serial_core.h2
-rw-r--r--include/linux/serial_mfd.h47
-rw-r--r--include/linux/serial_reg.h16
3 files changed, 65 insertions, 0 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 9ddc866ccc09..f8fce351463d 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -189,6 +189,8 @@
/* MAX3107 */
#define PORT_MAX3107 94
+/* High Speed UART for Medfield */
+#define PORT_MFD 95
#ifdef __KERNEL__
diff --git a/include/linux/serial_mfd.h b/include/linux/serial_mfd.h
new file mode 100644
index 000000000000..2b071e0b034d
--- /dev/null
+++ b/include/linux/serial_mfd.h
@@ -0,0 +1,47 @@
+#ifndef _SERIAL_MFD_H_
+#define _SERIAL_MFD_H_
+
+/* HW register offset definition */
+#define UART_FOR 0x08
+#define UART_PS 0x0C
+#define UART_MUL 0x0D
+#define UART_DIV 0x0E
+
+#define HSU_GBL_IEN 0x0
+#define HSU_GBL_IST 0x4
+
+#define HSU_GBL_INT_BIT_PORT0 0x0
+#define HSU_GBL_INT_BIT_PORT1 0x1
+#define HSU_GBL_INT_BIT_PORT2 0x2
+#define HSU_GBL_INT_BIT_IRI 0x3
+#define HSU_GBL_INT_BIT_HDLC 0x4
+#define HSU_GBL_INT_BIT_DMA 0x5
+
+#define HSU_GBL_ISR 0x8
+#define HSU_GBL_DMASR 0x400
+#define HSU_GBL_DMAISR 0x404
+
+#define HSU_PORT_REG_OFFSET 0x80
+#define HSU_PORT0_REG_OFFSET 0x80
+#define HSU_PORT1_REG_OFFSET 0x100
+#define HSU_PORT2_REG_OFFSET 0x180
+#define HSU_PORT_REG_LENGTH 0x80
+
+#define HSU_DMA_CHANS_REG_OFFSET 0x500
+#define HSU_DMA_CHANS_REG_LENGTH 0x40
+
+#define HSU_CH_SR 0x0 /* channel status reg */
+#define HSU_CH_CR 0x4 /* control reg */
+#define HSU_CH_DCR 0x8 /* descriptor control reg */
+#define HSU_CH_BSR 0x10 /* max fifo buffer size reg */
+#define HSU_CH_MOTSR 0x14 /* minimum ocp transfer size */
+#define HSU_CH_D0SAR 0x20 /* desc 0 start addr */
+#define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */
+#define HSU_CH_D1SAR 0x28
+#define HSU_CH_D1TSR 0x2C
+#define HSU_CH_D2SAR 0x30
+#define HSU_CH_D2TSR 0x34
+#define HSU_CH_D3SAR 0x38
+#define HSU_CH_D3TSR 0x3C
+
+#endif
diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h
index cf9327c051ad..c7a0ce11cd47 100644
--- a/include/linux/serial_reg.h
+++ b/include/linux/serial_reg.h
@@ -221,8 +221,24 @@
#define UART_FCR_PXAR16 0x80 /* receive FIFO threshold = 16 */
#define UART_FCR_PXAR32 0xc0 /* receive FIFO threshold = 32 */
+/*
+ * Intel MID on-chip HSU (High Speed UART) defined bits
+ */
+#define UART_FCR_HSU_64_1B 0x00 /* receive FIFO treshold = 1 */
+#define UART_FCR_HSU_64_16B 0x40 /* receive FIFO treshold = 16 */
+#define UART_FCR_HSU_64_32B 0x80 /* receive FIFO treshold = 32 */
+#define UART_FCR_HSU_64_56B 0xc0 /* receive FIFO treshold = 56 */
+
+#define UART_FCR_HSU_16_1B 0x00 /* receive FIFO treshold = 1 */
+#define UART_FCR_HSU_16_4B 0x40 /* receive FIFO treshold = 4 */
+#define UART_FCR_HSU_16_8B 0x80 /* receive FIFO treshold = 8 */
+#define UART_FCR_HSU_16_14B 0xc0 /* receive FIFO treshold = 14 */
+#define UART_FCR_HSU_64B_FIFO 0x20 /* chose 64 bytes FIFO */
+#define UART_FCR_HSU_16B_FIFO 0x00 /* chose 16 bytes FIFO */
+#define UART_FCR_HALF_EMPT_TXI 0x00 /* trigger TX_EMPT IRQ for half empty */
+#define UART_FCR_FULL_EMPT_TXI 0x08 /* trigger TX_EMPT IRQ for full empty */
/*
* These register definitions are for the 16C950