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path: root/drivers/tty/serial/msm_serial_hs.c
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-rw-r--r--drivers/tty/serial/msm_serial_hs.c1880
1 files changed, 1880 insertions, 0 deletions
diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
new file mode 100644
index 00000000000..2e7fc9cee9c
--- /dev/null
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -0,0 +1,1880 @@
+/*
+ * MSM 7k/8k High speed uart driver
+ *
+ * Copyright (c) 2007-2011, Code Aurora Forum. All rights reserved.
+ * Copyright (c) 2008 Google Inc.
+ * Modified: Nick Pelly <npelly@google.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Has optional support for uart power management independent of linux
+ * suspend/resume:
+ *
+ * RX wakeup.
+ * UART wakeup can be triggered by RX activity (using a wakeup GPIO on the
+ * UART RX pin). This should only be used if there is not a wakeup
+ * GPIO on the UART CTS, and the first RX byte is known (for example, with the
+ * Bluetooth Texas Instruments HCILL protocol), since the first RX byte will
+ * always be lost. RTS will be asserted even while the UART is off in this mode
+ * of operation. See msm_serial_hs_platform_data.rx_wakeup_irq.
+ */
+
+#include <linux/module.h>
+
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include <linux/atomic.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#include <mach/hardware.h>
+#include <mach/dma.h>
+#include <linux/platform_data/msm_serial_hs.h>
+
+/* HSUART Registers */
+#define UARTDM_MR1_ADDR 0x0
+#define UARTDM_MR2_ADDR 0x4
+
+/* Data Mover result codes */
+#define RSLT_FIFO_CNTR_BMSK (0xE << 28)
+#define RSLT_VLD BIT(1)
+
+/* write only register */
+#define UARTDM_CSR_ADDR 0x8
+#define UARTDM_CSR_115200 0xFF
+#define UARTDM_CSR_57600 0xEE
+#define UARTDM_CSR_38400 0xDD
+#define UARTDM_CSR_28800 0xCC
+#define UARTDM_CSR_19200 0xBB
+#define UARTDM_CSR_14400 0xAA
+#define UARTDM_CSR_9600 0x99
+#define UARTDM_CSR_7200 0x88
+#define UARTDM_CSR_4800 0x77
+#define UARTDM_CSR_3600 0x66
+#define UARTDM_CSR_2400 0x55
+#define UARTDM_CSR_1200 0x44
+#define UARTDM_CSR_600 0x33
+#define UARTDM_CSR_300 0x22
+#define UARTDM_CSR_150 0x11
+#define UARTDM_CSR_75 0x00
+
+/* write only register */
+#define UARTDM_TF_ADDR 0x70
+#define UARTDM_TF2_ADDR 0x74
+#define UARTDM_TF3_ADDR 0x78
+#define UARTDM_TF4_ADDR 0x7C
+
+/* write only register */
+#define UARTDM_CR_ADDR 0x10
+#define UARTDM_IMR_ADDR 0x14
+
+#define UARTDM_IPR_ADDR 0x18
+#define UARTDM_TFWR_ADDR 0x1c
+#define UARTDM_RFWR_ADDR 0x20
+#define UARTDM_HCR_ADDR 0x24
+#define UARTDM_DMRX_ADDR 0x34
+#define UARTDM_IRDA_ADDR 0x38
+#define UARTDM_DMEN_ADDR 0x3c
+
+/* UART_DM_NO_CHARS_FOR_TX */
+#define UARTDM_NCF_TX_ADDR 0x40
+
+#define UARTDM_BADR_ADDR 0x44
+
+#define UARTDM_SIM_CFG_ADDR 0x80
+/* Read Only register */
+#define UARTDM_SR_ADDR 0x8
+
+/* Read Only register */
+#define UARTDM_RF_ADDR 0x70
+#define UARTDM_RF2_ADDR 0x74
+#define UARTDM_RF3_ADDR 0x78
+#define UARTDM_RF4_ADDR 0x7C
+
+/* Read Only register */
+#define UARTDM_MISR_ADDR 0x10
+
+/* Read Only register */
+#define UARTDM_ISR_ADDR 0x14
+#define UARTDM_RX_TOTAL_SNAP_ADDR 0x38
+
+#define UARTDM_RXFS_ADDR 0x50
+
+/* Register field Mask Mapping */
+#define UARTDM_SR_PAR_FRAME_BMSK BIT(5)
+#define UARTDM_SR_OVERRUN_BMSK BIT(4)
+#define UARTDM_SR_TXEMT_BMSK BIT(3)
+#define UARTDM_SR_TXRDY_BMSK BIT(2)
+#define UARTDM_SR_RXRDY_BMSK BIT(0)
+
+#define UARTDM_CR_TX_DISABLE_BMSK BIT(3)
+#define UARTDM_CR_RX_DISABLE_BMSK BIT(1)
+#define UARTDM_CR_TX_EN_BMSK BIT(2)
+#define UARTDM_CR_RX_EN_BMSK BIT(0)
+
+/* UARTDM_CR channel_comman bit value (register field is bits 8:4) */
+#define RESET_RX 0x10
+#define RESET_TX 0x20
+#define RESET_ERROR_STATUS 0x30
+#define RESET_BREAK_INT 0x40
+#define START_BREAK 0x50
+#define STOP_BREAK 0x60
+#define RESET_CTS 0x70
+#define RESET_STALE_INT 0x80
+#define RFR_LOW 0xD0
+#define RFR_HIGH 0xE0
+#define CR_PROTECTION_EN 0x100
+#define STALE_EVENT_ENABLE 0x500
+#define STALE_EVENT_DISABLE 0x600
+#define FORCE_STALE_EVENT 0x400
+#define CLEAR_TX_READY 0x300
+#define RESET_TX_ERROR 0x800
+#define RESET_TX_DONE 0x810
+
+#define UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK 0xffffff00
+#define UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK 0x3f
+#define UARTDM_MR1_CTS_CTL_BMSK 0x40
+#define UARTDM_MR1_RX_RDY_CTL_BMSK 0x80
+
+#define UARTDM_MR2_ERROR_MODE_BMSK 0x40
+#define UARTDM_MR2_BITS_PER_CHAR_BMSK 0x30
+
+/* bits per character configuration */
+#define FIVE_BPC (0 << 4)
+#define SIX_BPC (1 << 4)
+#define SEVEN_BPC (2 << 4)
+#define EIGHT_BPC (3 << 4)
+
+#define UARTDM_MR2_STOP_BIT_LEN_BMSK 0xc
+#define STOP_BIT_ONE (1 << 2)
+#define STOP_BIT_TWO (3 << 2)
+
+#define UARTDM_MR2_PARITY_MODE_BMSK 0x3
+
+/* Parity configuration */
+#define NO_PARITY 0x0
+#define EVEN_PARITY 0x1
+#define ODD_PARITY 0x2
+#define SPACE_PARITY 0x3
+
+#define UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK 0xffffff80
+#define UARTDM_IPR_STALE_LSB_BMSK 0x1f
+
+/* These can be used for both ISR and IMR register */
+#define UARTDM_ISR_TX_READY_BMSK BIT(7)
+#define UARTDM_ISR_CURRENT_CTS_BMSK BIT(6)
+#define UARTDM_ISR_DELTA_CTS_BMSK BIT(5)
+#define UARTDM_ISR_RXLEV_BMSK BIT(4)
+#define UARTDM_ISR_RXSTALE_BMSK BIT(3)
+#define UARTDM_ISR_RXBREAK_BMSK BIT(2)
+#define UARTDM_ISR_RXHUNT_BMSK BIT(1)
+#define UARTDM_ISR_TXLEV_BMSK BIT(0)
+
+/* Field definitions for UART_DM_DMEN*/
+#define UARTDM_TX_DM_EN_BMSK 0x1
+#define UARTDM_RX_DM_EN_BMSK 0x2
+
+#define UART_FIFOSIZE 64
+#define UARTCLK 7372800
+
+/* Rx DMA request states */
+enum flush_reason {
+ FLUSH_NONE,
+ FLUSH_DATA_READY,
+ FLUSH_DATA_INVALID, /* values after this indicate invalid data */
+ FLUSH_IGNORE = FLUSH_DATA_INVALID,
+ FLUSH_STOP,
+ FLUSH_SHUTDOWN,
+};
+
+/* UART clock states */
+enum msm_hs_clk_states_e {
+ MSM_HS_CLK_PORT_OFF, /* port not in use */
+ MSM_HS_CLK_OFF, /* clock disabled */
+ MSM_HS_CLK_REQUEST_OFF, /* disable after TX and RX flushed */
+ MSM_HS_CLK_ON, /* clock enabled */
+};
+
+/* Track the forced RXSTALE flush during clock off sequence.
+ * These states are only valid during MSM_HS_CLK_REQUEST_OFF */
+enum msm_hs_clk_req_off_state_e {
+ CLK_REQ_OFF_START,
+ CLK_REQ_OFF_RXSTALE_ISSUED,
+ CLK_REQ_OFF_FLUSH_ISSUED,
+ CLK_REQ_OFF_RXSTALE_FLUSHED,
+};
+
+/**
+ * struct msm_hs_tx
+ * @tx_ready_int_en: ok to dma more tx?
+ * @dma_in_flight: tx dma in progress
+ * @xfer: top level DMA command pointer structure
+ * @command_ptr: third level command struct pointer
+ * @command_ptr_ptr: second level command list struct pointer
+ * @mapped_cmd_ptr: DMA view of third level command struct
+ * @mapped_cmd_ptr_ptr: DMA view of second level command list struct
+ * @tx_count: number of bytes to transfer in DMA transfer
+ * @dma_base: DMA view of UART xmit buffer
+ *
+ * This structure describes a single Tx DMA transaction. MSM DMA
+ * commands have two levels of indirection. The top level command
+ * ptr points to a list of command ptr which in turn points to a
+ * single DMA 'command'. In our case each Tx transaction consists
+ * of a single second level pointer pointing to a 'box type' command.
+ */
+struct msm_hs_tx {
+ unsigned int tx_ready_int_en;
+ unsigned int dma_in_flight;
+ struct msm_dmov_cmd xfer;
+ dmov_box *command_ptr;
+ u32 *command_ptr_ptr;
+ dma_addr_t mapped_cmd_ptr;
+ dma_addr_t mapped_cmd_ptr_ptr;
+ int tx_count;
+ dma_addr_t dma_base;
+};
+
+/**
+ * struct msm_hs_rx
+ * @flush: Rx DMA request state
+ * @xfer: top level DMA command pointer structure
+ * @cmdptr_dmaaddr: DMA view of second level command structure
+ * @command_ptr: third level DMA command pointer structure
+ * @command_ptr_ptr: second level DMA command list pointer
+ * @mapped_cmd_ptr: DMA view of the third level command structure
+ * @wait: wait for DMA completion before shutdown
+ * @buffer: destination buffer for RX DMA
+ * @rbuffer: DMA view of buffer
+ * @pool: dma pool out of which coherent rx buffer is allocated
+ * @tty_work: private work-queue for tty flip buffer push task
+ *
+ * This structure describes a single Rx DMA transaction. Rx DMA
+ * transactions use box mode DMA commands.
+ */
+struct msm_hs_rx {
+ enum flush_reason flush;
+ struct msm_dmov_cmd xfer;
+ dma_addr_t cmdptr_dmaaddr;
+ dmov_box *command_ptr;
+ u32 *command_ptr_ptr;
+ dma_addr_t mapped_cmd_ptr;
+ wait_queue_head_t wait;
+ dma_addr_t rbuffer;
+ unsigned char *buffer;
+ struct dma_pool *pool;
+ struct work_struct tty_work;
+};
+
+/**
+ * struct msm_hs_rx_wakeup
+ * @irq: IRQ line to be configured as interrupt source on Rx activity
+ * @ignore: boolean value. 1 = ignore the wakeup interrupt
+ * @rx_to_inject: extra character to be inserted to Rx tty on wakeup
+ * @inject_rx: 1 = insert rx_to_inject. 0 = do not insert extra character
+ *
+ * This is an optional structure required for UART Rx GPIO IRQ based
+ * wakeup from low power state. UART wakeup can be triggered by RX activity
+ * (using a wakeup GPIO on the UART RX pin). This should only be used if
+ * there is not a wakeup GPIO on the UART CTS, and the first RX byte is
+ * known (eg., with the Bluetooth Texas Instruments HCILL protocol),
+ * since the first RX byte will always be lost. RTS will be asserted even
+ * while the UART is clocked off in this mode of operation.
+ */
+struct msm_hs_rx_wakeup {
+ int irq; /* < 0 indicates low power wakeup disabled */
+ unsigned char ignore;
+ unsigned char inject_rx;
+ char rx_to_inject;
+};
+
+/**
+ * struct msm_hs_port
+ * @uport: embedded uart port structure
+ * @imr_reg: shadow value of UARTDM_IMR
+ * @clk: uart input clock handle
+ * @tx: Tx transaction related data structure
+ * @rx: Rx transaction related data structure
+ * @dma_tx_channel: Tx DMA command channel
+ * @dma_rx_channel Rx DMA command channel
+ * @dma_tx_crci: Tx channel rate control interface number
+ * @dma_rx_crci: Rx channel rate control interface number
+ * @clk_off_timer: Timer to poll DMA event completion before clock off
+ * @clk_off_delay: clk_off_timer poll interval
+ * @clk_state: overall clock state
+ * @clk_req_off_state: post flush clock states
+ * @rx_wakeup: optional rx_wakeup feature related data
+ * @exit_lpm_cb: optional callback to exit low power mode
+ *
+ * Low level serial port structure.
+ */
+struct msm_hs_port {
+ struct uart_port uport;
+ unsigned long imr_reg;
+ struct clk *clk;
+ struct msm_hs_tx tx;
+ struct msm_hs_rx rx;
+
+ int dma_tx_channel;
+ int dma_rx_channel;
+ int dma_tx_crci;
+ int dma_rx_crci;
+
+ struct hrtimer clk_off_timer;
+ ktime_t clk_off_delay;
+ enum msm_hs_clk_states_e clk_state;
+ enum msm_hs_clk_req_off_state_e clk_req_off_state;
+
+ struct msm_hs_rx_wakeup rx_wakeup;
+ void (*exit_lpm_cb)(struct uart_port *);
+};
+
+#define MSM_UARTDM_BURST_SIZE 16 /* DM burst size (in bytes) */
+#define UARTDM_TX_BUF_SIZE UART_XMIT_SIZE
+#define UARTDM_RX_BUF_SIZE 512
+
+#define UARTDM_NR 2
+
+static struct msm_hs_port q_uart_port[UARTDM_NR];
+static struct platform_driver msm_serial_hs_platform_driver;
+static struct uart_driver msm_hs_driver;
+static struct uart_ops msm_hs_ops;
+static struct workqueue_struct *msm_hs_workqueue;
+
+#define UARTDM_TO_MSM(uart_port) \
+ container_of((uart_port), struct msm_hs_port, uport)
+
+static unsigned int use_low_power_rx_wakeup(struct msm_hs_port
+ *msm_uport)
+{
+ return (msm_uport->rx_wakeup.irq >= 0);
+}
+
+static unsigned int msm_hs_read(struct uart_port *uport,
+ unsigned int offset)
+{
+ return ioread32(uport->membase + offset);
+}
+
+static void msm_hs_write(struct uart_port *uport, unsigned int offset,
+ unsigned int value)
+{
+ iowrite32(value, uport->membase + offset);
+}
+
+static void msm_hs_release_port(struct uart_port *port)
+{
+ iounmap(port->membase);
+}
+
+static int msm_hs_request_port(struct uart_port *port)
+{
+ port->membase = ioremap(port->mapbase, PAGE_SIZE);
+ if (unlikely(!port->membase))
+ return -ENOMEM;
+
+ /* configure the CR Protection to Enable */
+ msm_hs_write(port, UARTDM_CR_ADDR, CR_PROTECTION_EN);
+ return 0;
+}
+
+static int __devexit msm_hs_remove(struct platform_device *pdev)
+{
+
+ struct msm_hs_port *msm_uport;
+ struct device *dev;
+
+ if (pdev->id < 0 || pdev->id >= UARTDM_NR) {
+ printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id);
+ return -EINVAL;
+ }
+
+ msm_uport = &q_uart_port[pdev->id];
+ dev = msm_uport->uport.dev;
+
+ dma_unmap_single(dev, msm_uport->rx.mapped_cmd_ptr, sizeof(dmov_box),
+ DMA_TO_DEVICE);
+ dma_pool_free(msm_uport->rx.pool, msm_uport->rx.buffer,
+ msm_uport->rx.rbuffer);
+ dma_pool_destroy(msm_uport->rx.pool);
+
+ dma_unmap_single(dev, msm_uport->rx.cmdptr_dmaaddr, sizeof(u32 *),
+ DMA_TO_DEVICE);
+ dma_unmap_single(dev, msm_uport->tx.mapped_cmd_ptr_ptr, sizeof(u32 *),
+ DMA_TO_DEVICE);
+ dma_unmap_single(dev, msm_uport->tx.mapped_cmd_ptr, sizeof(dmov_box),
+ DMA_TO_DEVICE);
+
+ uart_remove_one_port(&msm_hs_driver, &msm_uport->uport);
+ clk_put(msm_uport->clk);
+
+ /* Free the tx resources */
+ kfree(msm_uport->tx.command_ptr);
+ kfree(msm_uport->tx.command_ptr_ptr);
+
+ /* Free the rx resources */
+ kfree(msm_uport->rx.command_ptr);
+ kfree(msm_uport->rx.command_ptr_ptr);
+
+ iounmap(msm_uport->uport.membase);
+
+ return 0;
+}
+
+static int msm_hs_init_clk_locked(struct uart_port *uport)
+{
+ int ret;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ ret = clk_enable(msm_uport->clk);
+ if (ret) {
+ printk(KERN_ERR "Error could not turn on UART clk\n");
+ return ret;
+ }
+
+ /* Set up the MREG/NREG/DREG/MNDREG */
+ ret = clk_set_rate(msm_uport->clk, uport->uartclk);
+ if (ret) {
+ printk(KERN_WARNING "Error setting clock rate on UART\n");
+ clk_disable(msm_uport->clk);
+ return ret;
+ }
+
+ msm_uport->clk_state = MSM_HS_CLK_ON;
+ return 0;
+}
+
+/* Enable and Disable clocks (Used for power management) */
+static void msm_hs_pm(struct uart_port *uport, unsigned int state,
+ unsigned int oldstate)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ if (use_low_power_rx_wakeup(msm_uport) ||
+ msm_uport->exit_lpm_cb)
+ return; /* ignore linux PM states,
+ use msm_hs_request_clock API */
+
+ switch (state) {
+ case 0:
+ clk_enable(msm_uport->clk);
+ break;
+ case 3:
+ clk_disable(msm_uport->clk);
+ break;
+ default:
+ dev_err(uport->dev, "msm_serial: Unknown PM state %d\n",
+ state);
+ }
+}
+
+/*
+ * programs the UARTDM_CSR register with correct bit rates
+ *
+ * Interrupts should be disabled before we are called, as
+ * we modify Set Baud rate
+ * Set receive stale interrupt level, dependant on Bit Rate
+ * Goal is to have around 8 ms before indicate stale.
+ * roundup (((Bit Rate * .008) / 10) + 1
+ */
+static void msm_hs_set_bps_locked(struct uart_port *uport,
+ unsigned int bps)
+{
+ unsigned long rxstale;
+ unsigned long data;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ switch (bps) {
+ case 300:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_75);
+ rxstale = 1;
+ break;
+ case 600:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_150);
+ rxstale = 1;
+ break;
+ case 1200:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_300);
+ rxstale = 1;
+ break;
+ case 2400:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_600);
+ rxstale = 1;
+ break;
+ case 4800:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_1200);
+ rxstale = 1;
+ break;
+ case 9600:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_2400);
+ rxstale = 2;
+ break;
+ case 14400:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_3600);
+ rxstale = 3;
+ break;
+ case 19200:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_4800);
+ rxstale = 4;
+ break;
+ case 28800:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_7200);
+ rxstale = 6;
+ break;
+ case 38400:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_9600);
+ rxstale = 8;
+ break;
+ case 57600:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_14400);
+ rxstale = 16;
+ break;
+ case 76800:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_19200);
+ rxstale = 16;
+ break;
+ case 115200:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_28800);
+ rxstale = 31;
+ break;
+ case 230400:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_57600);
+ rxstale = 31;
+ break;
+ case 460800:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_115200);
+ rxstale = 31;
+ break;
+ case 4000000:
+ case 3686400:
+ case 3200000:
+ case 3500000:
+ case 3000000:
+ case 2500000:
+ case 1500000:
+ case 1152000:
+ case 1000000:
+ case 921600:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_115200);
+ rxstale = 31;
+ break;
+ default:
+ msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_2400);
+ /* default to 9600 */
+ bps = 9600;
+ rxstale = 2;
+ break;
+ }
+ if (bps > 460800)
+ uport->uartclk = bps * 16;
+ else
+ uport->uartclk = UARTCLK;
+
+ if (clk_set_rate(msm_uport->clk, uport->uartclk)) {
+ printk(KERN_WARNING "Error setting clock rate on UART\n");
+ return;
+ }
+
+ data = rxstale & UARTDM_IPR_STALE_LSB_BMSK;
+ data |= UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK & (rxstale << 2);
+
+ msm_hs_write(uport, UARTDM_IPR_ADDR, data);
+}
+
+/*
+ * termios : new ktermios
+ * oldtermios: old ktermios previous setting
+ *
+ * Configure the serial port
+ */
+static void msm_hs_set_termios(struct uart_port *uport,
+ struct ktermios *termios,
+ struct ktermios *oldtermios)
+{
+ unsigned int bps;
+ unsigned long data;
+ unsigned long flags;
+ unsigned int c_cflag = termios->c_cflag;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ spin_lock_irqsave(&uport->lock, flags);
+ clk_enable(msm_uport->clk);
+
+ /* 300 is the minimum baud support by the driver */
+ bps = uart_get_baud_rate(uport, termios, oldtermios, 200, 4000000);
+
+ /* Temporary remapping 200 BAUD to 3.2 mbps */
+ if (bps == 200)
+ bps = 3200000;
+
+ msm_hs_set_bps_locked(uport, bps);
+
+ data = msm_hs_read(uport, UARTDM_MR2_ADDR);
+ data &= ~UARTDM_MR2_PARITY_MODE_BMSK;
+ /* set parity */
+ if (PARENB == (c_cflag & PARENB)) {
+ if (PARODD == (c_cflag & PARODD))
+ data |= ODD_PARITY;
+ else if (CMSPAR == (c_cflag & CMSPAR))
+ data |= SPACE_PARITY;
+ else
+ data |= EVEN_PARITY;
+ }
+
+ /* Set bits per char */
+ data &= ~UARTDM_MR2_BITS_PER_CHAR_BMSK;
+
+ switch (c_cflag & CSIZE) {
+ case CS5:
+ data |= FIVE_BPC;
+ break;
+ case CS6:
+ data |= SIX_BPC;
+ break;
+ case CS7:
+ data |= SEVEN_BPC;
+ break;
+ default:
+ data |= EIGHT_BPC;
+ break;
+ }
+ /* stop bits */
+ if (c_cflag & CSTOPB) {
+ data |= STOP_BIT_TWO;
+ } else {
+ /* otherwise 1 stop bit */
+ data |= STOP_BIT_ONE;
+ }
+ data |= UARTDM_MR2_ERROR_MODE_BMSK;
+ /* write parity/bits per char/stop bit configuration */
+ msm_hs_write(uport, UARTDM_MR2_ADDR, data);
+
+ /* Configure HW flow control */
+ data = msm_hs_read(uport, UARTDM_MR1_ADDR);
+
+ data &= ~(UARTDM_MR1_CTS_CTL_BMSK | UARTDM_MR1_RX_RDY_CTL_BMSK);
+
+ if (c_cflag & CRTSCTS) {
+ data |= UARTDM_MR1_CTS_CTL_BMSK;
+ data |= UARTDM_MR1_RX_RDY_CTL_BMSK;
+ }
+
+ msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+
+ uport->ignore_status_mask = termios->c_iflag & INPCK;
+ uport->ignore_status_mask |= termios->c_iflag & IGNPAR;
+ uport->read_status_mask = (termios->c_cflag & CREAD);
+
+ msm_hs_write(uport, UARTDM_IMR_ADDR, 0);
+
+ /* Set Transmit software time out */
+ uart_update_timeout(uport, c_cflag, bps);
+
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_TX);
+
+ if (msm_uport->rx.flush == FLUSH_NONE) {
+ msm_uport->rx.flush = FLUSH_IGNORE;
+ msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1);
+ }
+
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+ clk_disable(msm_uport->clk);
+ spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+/*
+ * Standard API, Transmitter
+ * Any character in the transmit shift register is sent
+ */
+static unsigned int msm_hs_tx_empty(struct uart_port *uport)
+{
+ unsigned int data;
+ unsigned int ret = 0;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ clk_enable(msm_uport->clk);
+
+ data = msm_hs_read(uport, UARTDM_SR_ADDR);
+ if (data & UARTDM_SR_TXEMT_BMSK)
+ ret = TIOCSER_TEMT;
+
+ clk_disable(msm_uport->clk);
+
+ return ret;
+}
+
+/*
+ * Standard API, Stop transmitter.
+ * Any character in the transmit shift register is sent as
+ * well as the current data mover transfer .
+ */
+static void msm_hs_stop_tx_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ msm_uport->tx.tx_ready_int_en = 0;
+}
+
+/*
+ * Standard API, Stop receiver as soon as possible.
+ *
+ * Function immediately terminates the operation of the
+ * channel receiver and any incoming characters are lost. None
+ * of the receiver status bits are affected by this command and
+ * characters that are already in the receive FIFO there.
+ */
+static void msm_hs_stop_rx_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+ unsigned int data;
+
+ clk_enable(msm_uport->clk);
+
+ /* disable dlink */
+ data = msm_hs_read(uport, UARTDM_DMEN_ADDR);
+ data &= ~UARTDM_RX_DM_EN_BMSK;
+ msm_hs_write(uport, UARTDM_DMEN_ADDR, data);
+
+ /* Disable the receiver */
+ if (msm_uport->rx.flush == FLUSH_NONE)
+ msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1);
+
+ if (msm_uport->rx.flush != FLUSH_SHUTDOWN)
+ msm_uport->rx.flush = FLUSH_STOP;
+
+ clk_disable(msm_uport->clk);
+}
+
+/* Transmit the next chunk of data */
+static void msm_hs_submit_tx_locked(struct uart_port *uport)
+{
+ int left;
+ int tx_count;
+ dma_addr_t src_addr;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+ struct msm_hs_tx *tx = &msm_uport->tx;
+ struct circ_buf *tx_buf = &msm_uport->uport.state->xmit;
+
+ if (uart_circ_empty(tx_buf) || uport->state->port.tty->stopped) {
+ msm_hs_stop_tx_locked(uport);
+ return;
+ }
+
+ tx->dma_in_flight = 1;
+
+ tx_count = uart_circ_chars_pending(tx_buf);
+
+ if (UARTDM_TX_BUF_SIZE < tx_count)
+ tx_count = UARTDM_TX_BUF_SIZE;
+
+ left = UART_XMIT_SIZE - tx_buf->tail;
+
+ if (tx_count > left)
+ tx_count = left;
+
+ src_addr = tx->dma_base + tx_buf->tail;
+ dma_sync_single_for_device(uport->dev, src_addr, tx_count,
+ DMA_TO_DEVICE);
+
+ tx->command_ptr->num_rows = (((tx_count + 15) >> 4) << 16) |
+ ((tx_count + 15) >> 4);
+ tx->command_ptr->src_row_addr = src_addr;
+
+ dma_sync_single_for_device(uport->dev, tx->mapped_cmd_ptr,
+ sizeof(dmov_box), DMA_TO_DEVICE);
+
+ *tx->command_ptr_ptr = CMD_PTR_LP | DMOV_CMD_ADDR(tx->mapped_cmd_ptr);
+
+ dma_sync_single_for_device(uport->dev, tx->mapped_cmd_ptr_ptr,
+ sizeof(u32 *), DMA_TO_DEVICE);
+
+ /* Save tx_count to use in Callback */
+ tx->tx_count = tx_count;
+ msm_hs_write(uport, UARTDM_NCF_TX_ADDR, tx_count);
+
+ /* Disable the tx_ready interrupt */
+ msm_uport->imr_reg &= ~UARTDM_ISR_TX_READY_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+ msm_dmov_enqueue_cmd(msm_uport->dma_tx_channel, &tx->xfer);
+}
+
+/* Start to receive the next chunk of data */
+static void msm_hs_start_rx_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT);
+ msm_hs_write(uport, UARTDM_DMRX_ADDR, UARTDM_RX_BUF_SIZE);
+ msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_ENABLE);
+ msm_uport->imr_reg |= UARTDM_ISR_RXLEV_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+ msm_uport->rx.flush = FLUSH_NONE;
+ msm_dmov_enqueue_cmd(msm_uport->dma_rx_channel, &msm_uport->rx.xfer);
+
+ /* might have finished RX and be ready to clock off */
+ hrtimer_start(&msm_uport->clk_off_timer, msm_uport->clk_off_delay,
+ HRTIMER_MODE_REL);
+}
+
+/* Enable the transmitter Interrupt */
+static void msm_hs_start_tx_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ clk_enable(msm_uport->clk);
+
+ if (msm_uport->exit_lpm_cb)
+ msm_uport->exit_lpm_cb(uport);
+
+ if (msm_uport->tx.tx_ready_int_en == 0) {
+ msm_uport->tx.tx_ready_int_en = 1;
+ msm_hs_submit_tx_locked(uport);
+ }
+
+ clk_disable(msm_uport->clk);
+}
+
+/*
+ * This routine is called when we are done with a DMA transfer
+ *
+ * This routine is registered with Data mover when we set
+ * up a Data Mover transfer. It is called from Data mover ISR
+ * when the DMA transfer is done.
+ */
+static void msm_hs_dmov_tx_callback(struct msm_dmov_cmd *cmd_ptr,
+ unsigned int result,
+ struct msm_dmov_errdata *err)
+{
+ unsigned long flags;
+ struct msm_hs_port *msm_uport;
+
+ /* DMA did not finish properly */
+ WARN_ON((((result & RSLT_FIFO_CNTR_BMSK) >> 28) == 1) &&
+ !(result & RSLT_VLD));
+
+ msm_uport = container_of(cmd_ptr, struct msm_hs_port, tx.xfer);
+
+ spin_lock_irqsave(&msm_uport->uport.lock, flags);
+ clk_enable(msm_uport->clk);
+
+ msm_uport->imr_reg |= UARTDM_ISR_TX_READY_BMSK;
+ msm_hs_write(&msm_uport->uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+ clk_disable(msm_uport->clk);
+ spin_unlock_irqrestore(&msm_uport->uport.lock, flags);
+}
+
+/*
+ * This routine is called when we are done with a DMA transfer or the
+ * a flush has been sent to the data mover driver.
+ *
+ * This routine is registered with Data mover when we set up a Data Mover
+ * transfer. It is called from Data mover ISR when the DMA transfer is done.
+ */
+static void msm_hs_dmov_rx_callback(struct msm_dmov_cmd *cmd_ptr,
+ unsigned int result,
+ struct msm_dmov_errdata *err)
+{
+ int retval;
+ int rx_count;
+ unsigned long status;
+ unsigned int error_f = 0;
+ unsigned long flags;
+ unsigned int flush;
+ struct tty_struct *tty;
+ struct uart_port *uport;
+ struct msm_hs_port *msm_uport;
+
+ msm_uport = container_of(cmd_ptr, struct msm_hs_port, rx.xfer);
+ uport = &msm_uport->uport;
+
+ spin_lock_irqsave(&uport->lock, flags);
+ clk_enable(msm_uport->clk);
+
+ tty = uport->state->port.tty;
+
+ msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_DISABLE);
+
+ status = msm_hs_read(uport, UARTDM_SR_ADDR);
+
+ /* overflow is not connect to data in a FIFO */
+ if (unlikely((status & UARTDM_SR_OVERRUN_BMSK) &&
+ (uport->read_status_mask & CREAD))) {
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+ uport->icount.buf_overrun++;
+ error_f = 1;
+ }
+
+ if (!(uport->ignore_status_mask & INPCK))
+ status = status & ~(UARTDM_SR_PAR_FRAME_BMSK);
+
+ if (unlikely(status & UARTDM_SR_PAR_FRAME_BMSK)) {
+ /* Can not tell difference between parity & frame error */
+ uport->icount.parity++;
+ error_f = 1;
+ if (uport->ignore_status_mask & IGNPAR)
+ tty_insert_flip_char(tty, 0, TTY_PARITY);
+ }
+
+ if (error_f)
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_ERROR_STATUS);
+
+ if (msm_uport->clk_req_off_state == CLK_REQ_OFF_FLUSH_ISSUED)
+ msm_uport->clk_req_off_state = CLK_REQ_OFF_RXSTALE_FLUSHED;
+
+ flush = msm_uport->rx.flush;
+ if (flush == FLUSH_IGNORE)
+ msm_hs_start_rx_locked(uport);
+ if (flush == FLUSH_STOP)
+ msm_uport->rx.flush = FLUSH_SHUTDOWN;
+ if (flush >= FLUSH_DATA_INVALID)
+ goto out;
+
+ rx_count = msm_hs_read(uport, UARTDM_RX_TOTAL_SNAP_ADDR);
+
+ if (0 != (uport->read_status_mask & CREAD)) {
+ retval = tty_insert_flip_string(tty, msm_uport->rx.buffer,
+ rx_count);
+ BUG_ON(retval != rx_count);
+ }
+
+ msm_hs_start_rx_locked(uport);
+
+out:
+ clk_disable(msm_uport->clk);
+
+ spin_unlock_irqrestore(&uport->lock, flags);
+
+ if (flush < FLUSH_DATA_INVALID)
+ queue_work(msm_hs_workqueue, &msm_uport->rx.tty_work);
+}
+
+static void msm_hs_tty_flip_buffer_work(struct work_struct *work)
+{
+ struct msm_hs_port *msm_uport =
+ container_of(work, struct msm_hs_port, rx.tty_work);
+ struct tty_struct *tty = msm_uport->uport.state->port.tty;
+
+ tty_flip_buffer_push(tty);
+}
+
+/*
+ * Standard API, Current states of modem control inputs
+ *
+ * Since CTS can be handled entirely by HARDWARE we always
+ * indicate clear to send and count on the TX FIFO to block when
+ * it fills up.
+ *
+ * - TIOCM_DCD
+ * - TIOCM_CTS
+ * - TIOCM_DSR
+ * - TIOCM_RI
+ * (Unsupported) DCD and DSR will return them high. RI will return low.
+ */
+static unsigned int msm_hs_get_mctrl_locked(struct uart_port *uport)
+{
+ return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
+}
+
+/*
+ * True enables UART auto RFR, which indicates we are ready for data if the RX
+ * buffer is not full. False disables auto RFR, and deasserts RFR to indicate
+ * we are not ready for data. Must be called with UART clock on.
+ */
+static void set_rfr_locked(struct uart_port *uport, int auto_rfr)
+{
+ unsigned int data;
+
+ data = msm_hs_read(uport, UARTDM_MR1_ADDR);
+
+ if (auto_rfr) {
+ /* enable auto ready-for-receiving */
+ data |= UARTDM_MR1_RX_RDY_CTL_BMSK;
+ msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+ } else {
+ /* disable auto ready-for-receiving */
+ data &= ~UARTDM_MR1_RX_RDY_CTL_BMSK;
+ msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+ /* RFR is active low, set high */
+ msm_hs_write(uport, UARTDM_CR_ADDR, RFR_HIGH);
+ }
+}
+
+/*
+ * Standard API, used to set or clear RFR
+ */
+static void msm_hs_set_mctrl_locked(struct uart_port *uport,
+ unsigned int mctrl)
+{
+ unsigned int auto_rfr;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ clk_enable(msm_uport->clk);
+
+ auto_rfr = TIOCM_RTS & mctrl ? 1 : 0;
+ set_rfr_locked(uport, auto_rfr);
+
+ clk_disable(msm_uport->clk);
+}
+
+/* Standard API, Enable modem status (CTS) interrupt */
+static void msm_hs_enable_ms_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ clk_enable(msm_uport->clk);
+
+ /* Enable DELTA_CTS Interrupt */
+ msm_uport->imr_reg |= UARTDM_ISR_DELTA_CTS_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+ clk_disable(msm_uport->clk);
+
+}
+
+/*
+ * Standard API, Break Signal
+ *
+ * Control the transmission of a break signal. ctl eq 0 => break
+ * signal terminate ctl ne 0 => start break signal
+ */
+static void msm_hs_break_ctl(struct uart_port *uport, int ctl)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ clk_enable(msm_uport->clk);
+ msm_hs_write(uport, UARTDM_CR_ADDR, ctl ? START_BREAK : STOP_BREAK);
+ clk_disable(msm_uport->clk);
+}
+
+static void msm_hs_config_port(struct uart_port *uport, int cfg_flags)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&uport->lock, flags);
+ if (cfg_flags & UART_CONFIG_TYPE) {
+ uport->type = PORT_MSM;
+ msm_hs_request_port(uport);
+ }
+ spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+/* Handle CTS changes (Called from interrupt handler) */
+static void msm_hs_handle_delta_cts(struct uart_port *uport)
+{
+ unsigned long flags;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ spin_lock_irqsave(&uport->lock, flags);
+ clk_enable(msm_uport->clk);
+
+ /* clear interrupt */
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_CTS);
+ uport->icount.cts++;
+
+ clk_disable(msm_uport->clk);
+ spin_unlock_irqrestore(&uport->lock, flags);
+
+ /* clear the IOCTL TIOCMIWAIT if called */
+ wake_up_interruptible(&uport->state->port.delta_msr_wait);
+}
+
+/* check if the TX path is flushed, and if so clock off
+ * returns 0 did not clock off, need to retry (still sending final byte)
+ * -1 did not clock off, do not retry
+ * 1 if we clocked off
+ */
+static int msm_hs_check_clock_off_locked(struct uart_port *uport)
+{
+ unsigned long sr_status;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+ struct circ_buf *tx_buf = &uport->state->xmit;
+
+ /* Cancel if tx tty buffer is not empty, dma is in flight,
+ * or tx fifo is not empty, or rx fifo is not empty */
+ if (msm_uport->clk_state != MSM_HS_CLK_REQUEST_OFF ||
+ !uart_circ_empty(tx_buf) || msm_uport->tx.dma_in_flight ||
+ (msm_uport->imr_reg & UARTDM_ISR_TXLEV_BMSK) ||
+ !(msm_uport->imr_reg & UARTDM_ISR_RXLEV_BMSK)) {
+ return -1;
+ }
+
+ /* Make sure the uart is finished with the last byte */
+ sr_status = msm_hs_read(uport, UARTDM_SR_ADDR);
+ if (!(sr_status & UARTDM_SR_TXEMT_BMSK))
+ return 0; /* retry */
+
+ /* Make sure forced RXSTALE flush complete */
+ switch (msm_uport->clk_req_off_state) {
+ case CLK_REQ_OFF_START:
+ msm_uport->clk_req_off_state = CLK_REQ_OFF_RXSTALE_ISSUED;
+ msm_hs_write(uport, UARTDM_CR_ADDR, FORCE_STALE_EVENT);
+ return 0; /* RXSTALE flush not complete - retry */
+ case CLK_REQ_OFF_RXSTALE_ISSUED:
+ case CLK_REQ_OFF_FLUSH_ISSUED:
+ return 0; /* RXSTALE flush not complete - retry */
+ case CLK_REQ_OFF_RXSTALE_FLUSHED:
+ break; /* continue */
+ }
+
+ if (msm_uport->rx.flush != FLUSH_SHUTDOWN) {
+ if (msm_uport->rx.flush == FLUSH_NONE)
+ msm_hs_stop_rx_locked(uport);
+ return 0; /* come back later to really clock off */
+ }
+
+ /* we really want to clock off */
+ clk_disable(msm_uport->clk);
+ msm_uport->clk_state = MSM_HS_CLK_OFF;
+
+ if (use_low_power_rx_wakeup(msm_uport)) {
+ msm_uport->rx_wakeup.ignore = 1;
+ enable_irq(msm_uport->rx_wakeup.irq);
+ }
+ return 1;
+}
+
+static enum hrtimer_restart msm_hs_clk_off_retry(struct hrtimer *timer)
+{
+ unsigned long flags;
+ int ret = HRTIMER_NORESTART;
+ struct msm_hs_port *msm_uport = container_of(timer, struct msm_hs_port,
+ clk_off_timer);
+ struct uart_port *uport = &msm_uport->uport;
+
+ spin_lock_irqsave(&uport->lock, flags);
+
+ if (!msm_hs_check_clock_off_locked(uport)) {
+ hrtimer_forward_now(timer, msm_uport->clk_off_delay);
+ ret = HRTIMER_RESTART;
+ }
+
+ spin_unlock_irqrestore(&uport->lock, flags);
+
+ return ret;
+}
+
+static irqreturn_t msm_hs_isr(int irq, void *dev)
+{
+ unsigned long flags;
+ unsigned long isr_status;
+ struct msm_hs_port *msm_uport = dev;
+ struct uart_port *uport = &msm_uport->uport;
+ struct circ_buf *tx_buf = &uport->state->xmit;
+ struct msm_hs_tx *tx = &msm_uport->tx;
+ struct msm_hs_rx *rx = &msm_uport->rx;
+
+ spin_lock_irqsave(&uport->lock, flags);
+
+ isr_status = msm_hs_read(uport, UARTDM_MISR_ADDR);
+
+ /* Uart RX starting */
+ if (isr_status & UARTDM_ISR_RXLEV_BMSK) {
+ msm_uport->imr_reg &= ~UARTDM_ISR_RXLEV_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+ }
+ /* Stale rx interrupt */
+ if (isr_status & UARTDM_ISR_RXSTALE_BMSK) {
+ msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_DISABLE);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT);
+
+ if (msm_uport->clk_req_off_state == CLK_REQ_OFF_RXSTALE_ISSUED)
+ msm_uport->clk_req_off_state =
+ CLK_REQ_OFF_FLUSH_ISSUED;
+ if (rx->flush == FLUSH_NONE) {
+ rx->flush = FLUSH_DATA_READY;
+ msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1);
+ }
+ }
+ /* tx ready interrupt */
+ if (isr_status & UARTDM_ISR_TX_READY_BMSK) {
+ /* Clear TX Ready */
+ msm_hs_write(uport, UARTDM_CR_ADDR, CLEAR_TX_READY);
+
+ if (msm_uport->clk_state == MSM_HS_CLK_REQUEST_OFF) {
+ msm_uport->imr_reg |= UARTDM_ISR_TXLEV_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR,
+ msm_uport->imr_reg);
+ }
+
+ /* Complete DMA TX transactions and submit new transactions */
+ tx_buf->tail = (tx_buf->tail + tx->tx_count) & ~UART_XMIT_SIZE;
+
+ tx->dma_in_flight = 0;
+
+ uport->icount.tx += tx->tx_count;
+ if (tx->tx_ready_int_en)
+ msm_hs_submit_tx_locked(uport);
+
+ if (uart_circ_chars_pending(tx_buf) < WAKEUP_CHARS)
+ uart_write_wakeup(uport);
+ }
+ if (isr_status & UARTDM_ISR_TXLEV_BMSK) {
+ /* TX FIFO is empty */
+ msm_uport->imr_reg &= ~UARTDM_ISR_TXLEV_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+ if (!msm_hs_check_clock_off_locked(uport))
+ hrtimer_start(&msm_uport->clk_off_timer,
+ msm_uport->clk_off_delay,
+ HRTIMER_MODE_REL);
+ }
+
+ /* Change in CTS interrupt */
+ if (isr_status & UARTDM_ISR_DELTA_CTS_BMSK)
+ msm_hs_handle_delta_cts(uport);
+
+ spin_unlock_irqrestore(&uport->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+void msm_hs_request_clock_off_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ if (msm_uport->clk_state == MSM_HS_CLK_ON) {
+ msm_uport->clk_state = MSM_HS_CLK_REQUEST_OFF;
+ msm_uport->clk_req_off_state = CLK_REQ_OFF_START;
+ if (!use_low_power_rx_wakeup(msm_uport))
+ set_rfr_locked(uport, 0);
+ msm_uport->imr_reg |= UARTDM_ISR_TXLEV_BMSK;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+ }
+}
+
+/**
+ * msm_hs_request_clock_off - request to (i.e. asynchronously) turn off uart
+ * clock once pending TX is flushed and Rx DMA command is terminated.
+ * @uport: uart_port structure for the device instance.
+ *
+ * This functions puts the device into a partially active low power mode. It
+ * waits to complete all pending tx transactions, flushes ongoing Rx DMA
+ * command and terminates UART side Rx transaction, puts UART HW in non DMA
+ * mode and then clocks off the device. A client calls this when no UART
+ * data is expected. msm_request_clock_on() must be called before any further
+ * UART can be sent or received.
+ */
+void msm_hs_request_clock_off(struct uart_port *uport)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&uport->lock, flags);
+ msm_hs_request_clock_off_locked(uport);
+ spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+void msm_hs_request_clock_on_locked(struct uart_port *uport)
+{
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+ unsigned int data;
+
+ switch (msm_uport->clk_state) {
+ case MSM_HS_CLK_OFF:
+ clk_enable(msm_uport->clk);
+ disable_irq_nosync(msm_uport->rx_wakeup.irq);
+ /* fall-through */
+ case MSM_HS_CLK_REQUEST_OFF:
+ if (msm_uport->rx.flush == FLUSH_STOP ||
+ msm_uport->rx.flush == FLUSH_SHUTDOWN) {
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX);
+ data = msm_hs_read(uport, UARTDM_DMEN_ADDR);
+ data |= UARTDM_RX_DM_EN_BMSK;
+ msm_hs_write(uport, UARTDM_DMEN_ADDR, data);
+ }
+ hrtimer_try_to_cancel(&msm_uport->clk_off_timer);
+ if (msm_uport->rx.flush == FLUSH_SHUTDOWN)
+ msm_hs_start_rx_locked(uport);
+ if (!use_low_power_rx_wakeup(msm_uport))
+ set_rfr_locked(uport, 1);
+ if (msm_uport->rx.flush == FLUSH_STOP)
+ msm_uport->rx.flush = FLUSH_IGNORE;
+ msm_uport->clk_state = MSM_HS_CLK_ON;
+ break;
+ case MSM_HS_CLK_ON:
+ break;
+ case MSM_HS_CLK_PORT_OFF:
+ break;
+ }
+}
+
+/**
+ * msm_hs_request_clock_on - Switch the device from partially active low
+ * power mode to fully active (i.e. clock on) mode.
+ * @uport: uart_port structure for the device.
+ *
+ * This function switches on the input clock, puts UART HW into DMA mode
+ * and enqueues an Rx DMA command if the device was in partially active
+ * mode. It has no effect if called with the device in inactive state.
+ */
+void msm_hs_request_clock_on(struct uart_port *uport)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&uport->lock, flags);
+ msm_hs_request_clock_on_locked(uport);
+ spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+static irqreturn_t msm_hs_rx_wakeup_isr(int irq, void *dev)
+{
+ unsigned int wakeup = 0;
+ unsigned long flags;
+ struct msm_hs_port *msm_uport = dev;
+ struct uart_port *uport = &msm_uport->uport;
+ struct tty_struct *tty = NULL;
+
+ spin_lock_irqsave(&uport->lock, flags);
+ if (msm_uport->clk_state == MSM_HS_CLK_OFF) {
+ /* ignore the first irq - it is a pending irq that occured
+ * before enable_irq() */
+ if (msm_uport->rx_wakeup.ignore)
+ msm_uport->rx_wakeup.ignore = 0;
+ else
+ wakeup = 1;
+ }
+
+ if (wakeup) {
+ /* the uart was clocked off during an rx, wake up and
+ * optionally inject char into tty rx */
+ msm_hs_request_clock_on_locked(uport);
+ if (msm_uport->rx_wakeup.inject_rx) {
+ tty = uport->state->port.tty;
+ tty_insert_flip_char(tty,
+ msm_uport->rx_wakeup.rx_to_inject,
+ TTY_NORMAL);
+ queue_work(msm_hs_workqueue, &msm_uport->rx.tty_work);
+ }
+ }
+
+ spin_unlock_irqrestore(&uport->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static const char *msm_hs_type(struct uart_port *port)
+{
+ return (port->type == PORT_MSM) ? "MSM_HS_UART" : NULL;
+}
+
+/* Called when port is opened */
+static int msm_hs_startup(struct uart_port *uport)
+{
+ int ret;
+ int rfr_level;
+ unsigned long flags;
+ unsigned int data;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+ struct circ_buf *tx_buf = &uport->state->xmit;
+ struct msm_hs_tx *tx = &msm_uport->tx;
+ struct msm_hs_rx *rx = &msm_uport->rx;
+
+ rfr_level = uport->fifosize;
+ if (rfr_level > 16)
+ rfr_level -= 16;
+
+ tx->dma_base = dma_map_single(uport->dev, tx_buf->buf, UART_XMIT_SIZE,
+ DMA_TO_DEVICE);
+
+ /* do not let tty layer execute RX in global workqueue, use a
+ * dedicated workqueue managed by this driver */
+ uport->state->port.tty->low_latency = 1;
+
+ /* turn on uart clk */
+ ret = msm_hs_init_clk_locked(uport);
+ if (unlikely(ret)) {
+ printk(KERN_ERR "Turning uartclk failed!\n");
+ goto err_msm_hs_init_clk;
+ }
+
+ /* Set auto RFR Level */
+ data = msm_hs_read(uport, UARTDM_MR1_ADDR);
+ data &= ~UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK;
+ data &= ~UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK;
+ data |= (UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK & (rfr_level << 2));
+ data |= (UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK & rfr_level);
+ msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+
+ /* Make sure RXSTALE count is non-zero */
+ data = msm_hs_read(uport, UARTDM_IPR_ADDR);
+ if (!data) {
+ data |= 0x1f & UARTDM_IPR_STALE_LSB_BMSK;
+ msm_hs_write(uport, UARTDM_IPR_ADDR, data);
+ }
+
+ /* Enable Data Mover Mode */
+ data = UARTDM_TX_DM_EN_BMSK | UARTDM_RX_DM_EN_BMSK;
+ msm_hs_write(uport, UARTDM_DMEN_ADDR, data);
+
+ /* Reset TX */
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_TX);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_ERROR_STATUS);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_BREAK_INT);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RESET_CTS);
+ msm_hs_write(uport, UARTDM_CR_ADDR, RFR_LOW);
+ /* Turn on Uart Receiver */
+ msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_RX_EN_BMSK);
+
+ /* Turn on Uart Transmitter */
+ msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_TX_EN_BMSK);
+
+ /* Initialize the tx */
+ tx->tx_ready_int_en = 0;
+ tx->dma_in_flight = 0;
+
+ tx->xfer.complete_func = msm_hs_dmov_tx_callback;
+ tx->xfer.execute_func = NULL;
+
+ tx->command_ptr->cmd = CMD_LC |
+ CMD_DST_CRCI(msm_uport->dma_tx_crci) | CMD_MODE_BOX;
+
+ tx->command_ptr->src_dst_len = (MSM_UARTDM_BURST_SIZE << 16)
+ | (MSM_UARTDM_BURST_SIZE);
+
+ tx->command_ptr->row_offset = (MSM_UARTDM_BURST_SIZE << 16);
+
+ tx->command_ptr->dst_row_addr =
+ msm_uport->uport.mapbase + UARTDM_TF_ADDR;
+
+
+ /* Turn on Uart Receive */
+ rx->xfer.complete_func = msm_hs_dmov_rx_callback;
+ rx->xfer.execute_func = NULL;
+
+ rx->command_ptr->cmd = CMD_LC |
+ CMD_SRC_CRCI(msm_uport->dma_rx_crci) | CMD_MODE_BOX;
+
+ rx->command_ptr->src_dst_len = (MSM_UARTDM_BURST_SIZE << 16)
+ | (MSM_UARTDM_BURST_SIZE);
+ rx->command_ptr->row_offset = MSM_UARTDM_BURST_SIZE;
+ rx->command_ptr->src_row_addr = uport->mapbase + UARTDM_RF_ADDR;
+
+
+ msm_uport->imr_reg |= UARTDM_ISR_RXSTALE_BMSK;
+ /* Enable reading the current CTS, no harm even if CTS is ignored */
+ msm_uport->imr_reg |= UARTDM_ISR_CURRENT_CTS_BMSK;
+
+ msm_hs_write(uport, UARTDM_TFWR_ADDR, 0); /* TXLEV on empty TX fifo */
+
+
+ ret = request_irq(uport->irq, msm_hs_isr, IRQF_TRIGGER_HIGH,
+ "msm_hs_uart", msm_uport);
+ if (unlikely(ret)) {
+ printk(KERN_ERR "Request msm_hs_uart IRQ failed!\n");
+ goto err_request_irq;
+ }
+ if (use_low_power_rx_wakeup(msm_uport)) {
+ ret = request_irq(msm_uport->rx_wakeup.irq,
+ msm_hs_rx_wakeup_isr,
+ IRQF_TRIGGER_FALLING,
+ "msm_hs_rx_wakeup", msm_uport);
+ if (unlikely(ret)) {
+ printk(KERN_ERR "Request msm_hs_rx_wakeup IRQ failed!\n");
+ free_irq(uport->irq, msm_uport);
+ goto err_request_irq;
+ }
+ disable_irq(msm_uport->rx_wakeup.irq);
+ }
+
+ spin_lock_irqsave(&uport->lock, flags);
+
+ msm_hs_write(uport, UARTDM_RFWR_ADDR, 0);
+ msm_hs_start_rx_locked(uport);
+
+ spin_unlock_irqrestore(&uport->lock, flags);
+ ret = pm_runtime_set_active(uport->dev);
+ if (ret)
+ dev_err(uport->dev, "set active error:%d\n", ret);
+ pm_runtime_enable(uport->dev);
+
+ return 0;
+
+err_request_irq:
+err_msm_hs_init_clk:
+ dma_unmap_single(uport->dev, tx->dma_base,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
+ return ret;
+}
+
+/* Initialize tx and rx data structures */
+static int __devinit uartdm_init_port(struct uart_port *uport)
+{
+ int ret = 0;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+ struct msm_hs_tx *tx = &msm_uport->tx;
+ struct msm_hs_rx *rx = &msm_uport->rx;
+
+ /* Allocate the command pointer. Needs to be 64 bit aligned */
+ tx->command_ptr = kmalloc(sizeof(dmov_box), GFP_KERNEL | __GFP_DMA);
+ if (!tx->command_ptr)
+ return -ENOMEM;
+
+ tx->command_ptr_ptr = kmalloc(sizeof(u32 *), GFP_KERNEL | __GFP_DMA);
+ if (!tx->command_ptr_ptr) {
+ ret = -ENOMEM;
+ goto err_tx_command_ptr_ptr;
+ }
+
+ tx->mapped_cmd_ptr = dma_map_single(uport->dev, tx->command_ptr,
+ sizeof(dmov_box), DMA_TO_DEVICE);
+ tx->mapped_cmd_ptr_ptr = dma_map_single(uport->dev,
+ tx->command_ptr_ptr,
+ sizeof(u32 *), DMA_TO_DEVICE);
+ tx->xfer.cmdptr = DMOV_CMD_ADDR(tx->mapped_cmd_ptr_ptr);
+
+ init_waitqueue_head(&rx->wait);
+
+ rx->pool = dma_pool_create("rx_buffer_pool", uport->dev,
+ UARTDM_RX_BUF_SIZE, 16, 0);
+ if (!rx->pool) {
+ pr_err("%s(): cannot allocate rx_buffer_pool", __func__);
+ ret = -ENOMEM;
+ goto err_dma_pool_create;
+ }
+
+ rx->buffer = dma_pool_alloc(rx->pool, GFP_KERNEL, &rx->rbuffer);
+ if (!rx->buffer) {
+ pr_err("%s(): cannot allocate rx->buffer", __func__);
+ ret = -ENOMEM;
+ goto err_dma_pool_alloc;
+ }
+
+ /* Allocate the command pointer. Needs to be 64 bit aligned */
+ rx->command_ptr = kmalloc(sizeof(dmov_box), GFP_KERNEL | __GFP_DMA);
+ if (!rx->command_ptr) {
+ pr_err("%s(): cannot allocate rx->command_ptr", __func__);
+ ret = -ENOMEM;
+ goto err_rx_command_ptr;
+ }
+
+ rx->command_ptr_ptr = kmalloc(sizeof(u32 *), GFP_KERNEL | __GFP_DMA);
+ if (!rx->command_ptr_ptr) {
+ pr_err("%s(): cannot allocate rx->command_ptr_ptr", __func__);
+ ret = -ENOMEM;
+ goto err_rx_command_ptr_ptr;
+ }
+
+ rx->command_ptr->num_rows = ((UARTDM_RX_BUF_SIZE >> 4) << 16) |
+ (UARTDM_RX_BUF_SIZE >> 4);
+
+ rx->command_ptr->dst_row_addr = rx->rbuffer;
+
+ rx->mapped_cmd_ptr = dma_map_single(uport->dev, rx->command_ptr,
+ sizeof(dmov_box), DMA_TO_DEVICE);
+
+ *rx->command_ptr_ptr = CMD_PTR_LP | DMOV_CMD_ADDR(rx->mapped_cmd_ptr);
+
+ rx->cmdptr_dmaaddr = dma_map_single(uport->dev, rx->command_ptr_ptr,
+ sizeof(u32 *), DMA_TO_DEVICE);
+ rx->xfer.cmdptr = DMOV_CMD_ADDR(rx->cmdptr_dmaaddr);
+
+ INIT_WORK(&rx->tty_work, msm_hs_tty_flip_buffer_work);
+
+ return ret;
+
+err_rx_command_ptr_ptr:
+ kfree(rx->command_ptr);
+err_rx_command_ptr:
+ dma_pool_free(msm_uport->rx.pool, msm_uport->rx.buffer,
+ msm_uport->rx.rbuffer);
+err_dma_pool_alloc:
+ dma_pool_destroy(msm_uport->rx.pool);
+err_dma_pool_create:
+ dma_unmap_single(uport->dev, msm_uport->tx.mapped_cmd_ptr_ptr,
+ sizeof(u32 *), DMA_TO_DEVICE);
+ dma_unmap_single(uport->dev, msm_uport->tx.mapped_cmd_ptr,
+ sizeof(dmov_box), DMA_TO_DEVICE);
+ kfree(msm_uport->tx.command_ptr_ptr);
+err_tx_command_ptr_ptr:
+ kfree(msm_uport->tx.command_ptr);
+ return ret;
+}
+
+static int __devinit msm_hs_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct uart_port *uport;
+ struct msm_hs_port *msm_uport;
+ struct resource *resource;
+ const struct msm_serial_hs_platform_data *pdata =
+ pdev->dev.platform_data;
+
+ if (pdev->id < 0 || pdev->id >= UARTDM_NR) {
+ printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id);
+ return -EINVAL;
+ }
+
+ msm_uport = &q_uart_port[pdev->id];
+ uport = &msm_uport->uport;
+
+ uport->dev = &pdev->dev;
+
+ resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (unlikely(!resource))
+ return -ENXIO;
+
+ uport->mapbase = resource->start;
+ uport->irq = platform_get_irq(pdev, 0);
+ if (unlikely(uport->irq < 0))
+ return -ENXIO;
+
+ if (unlikely(set_irq_wake(uport->irq, 1)))
+ return -ENXIO;
+
+ if (pdata == NULL || pdata->rx_wakeup_irq < 0)
+ msm_uport->rx_wakeup.irq = -1;
+ else {
+ msm_uport->rx_wakeup.irq = pdata->rx_wakeup_irq;
+ msm_uport->rx_wakeup.ignore = 1;
+ msm_uport->rx_wakeup.inject_rx = pdata->inject_rx_on_wakeup;
+ msm_uport->rx_wakeup.rx_to_inject = pdata->rx_to_inject;
+
+ if (unlikely(msm_uport->rx_wakeup.irq < 0))
+ return -ENXIO;
+
+ if (unlikely(set_irq_wake(msm_uport->rx_wakeup.irq, 1)))
+ return -ENXIO;
+ }
+
+ if (pdata == NULL)
+ msm_uport->exit_lpm_cb = NULL;
+ else
+ msm_uport->exit_lpm_cb = pdata->exit_lpm_cb;
+
+ resource = platform_get_resource_byname(pdev, IORESOURCE_DMA,
+ "uartdm_channels");
+ if (unlikely(!resource))
+ return -ENXIO;
+
+ msm_uport->dma_tx_channel = resource->start;
+ msm_uport->dma_rx_channel = resource->end;
+
+ resource = platform_get_resource_byname(pdev, IORESOURCE_DMA,
+ "uartdm_crci");
+ if (unlikely(!resource))
+ return -ENXIO;
+
+ msm_uport->dma_tx_crci = resource->start;
+ msm_uport->dma_rx_crci = resource->end;
+
+ uport->iotype = UPIO_MEM;
+ uport->fifosize = UART_FIFOSIZE;
+ uport->ops = &msm_hs_ops;
+ uport->flags = UPF_BOOT_AUTOCONF;
+ uport->uartclk = UARTCLK;
+ msm_uport->imr_reg = 0x0;
+ msm_uport->clk = clk_get(&pdev->dev, "uartdm_clk");
+ if (IS_ERR(msm_uport->clk))
+ return PTR_ERR(msm_uport->clk);
+
+ ret = uartdm_init_port(uport);
+ if (unlikely(ret))
+ return ret;
+
+ msm_uport->clk_state = MSM_HS_CLK_PORT_OFF;
+ hrtimer_init(&msm_uport->clk_off_timer, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL);
+ msm_uport->clk_off_timer.function = msm_hs_clk_off_retry;
+ msm_uport->clk_off_delay = ktime_set(0, 1000000); /* 1ms */
+
+ uport->line = pdev->id;
+ return uart_add_one_port(&msm_hs_driver, uport);
+}
+
+static int __init msm_serial_hs_init(void)
+{
+ int ret, i;
+
+ /* Init all UARTS as non-configured */
+ for (i = 0; i < UARTDM_NR; i++)
+ q_uart_port[i].uport.type = PORT_UNKNOWN;
+
+ msm_hs_workqueue = create_singlethread_workqueue("msm_serial_hs");
+ if (unlikely(!msm_hs_workqueue))
+ return -ENOMEM;
+
+ ret = uart_register_driver(&msm_hs_driver);
+ if (unlikely(ret)) {
+ printk(KERN_ERR "%s failed to load\n", __func__);
+ goto err_uart_register_driver;
+ }
+
+ ret = platform_driver_register(&msm_serial_hs_platform_driver);
+ if (ret) {
+ printk(KERN_ERR "%s failed to load\n", __func__);
+ goto err_platform_driver_register;
+ }
+
+ return ret;
+
+err_platform_driver_register:
+ uart_unregister_driver(&msm_hs_driver);
+err_uart_register_driver:
+ destroy_workqueue(msm_hs_workqueue);
+ return ret;
+}
+module_init(msm_serial_hs_init);
+
+/*
+ * Called by the upper layer when port is closed.
+ * - Disables the port
+ * - Unhook the ISR
+ */
+static void msm_hs_shutdown(struct uart_port *uport)
+{
+ unsigned long flags;
+ struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+ BUG_ON(msm_uport->rx.flush < FLUSH_STOP);
+
+ spin_lock_irqsave(&uport->lock, flags);
+ clk_enable(msm_uport->clk);
+
+ /* Disable the transmitter */
+ msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_TX_DISABLE_BMSK);
+ /* Disable the receiver */
+ msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_RX_DISABLE_BMSK);
+
+ pm_runtime_disable(uport->dev);
+ pm_runtime_set_suspended(uport->dev);
+
+ /* Free the interrupt */
+ free_irq(uport->irq, msm_uport);
+ if (use_low_power_rx_wakeup(msm_uport))
+ free_irq(msm_uport->rx_wakeup.irq, msm_uport);
+
+ msm_uport->imr_reg = 0;
+ msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+ wait_event(msm_uport->rx.wait, msm_uport->rx.flush == FLUSH_SHUTDOWN);
+
+ clk_disable(msm_uport->clk); /* to balance local clk_enable() */
+ if (msm_uport->clk_state != MSM_HS_CLK_OFF)
+ clk_disable(msm_uport->clk); /* to balance clk_state */
+ msm_uport->clk_state = MSM_HS_CLK_PORT_OFF;
+
+ dma_unmap_single(uport->dev, msm_uport->tx.dma_base,
+ UART_XMIT_SIZE, DMA_TO_DEVICE);
+
+ spin_unlock_irqrestore(&uport->lock, flags);
+
+ if (cancel_work_sync(&msm_uport->rx.tty_work))
+ msm_hs_tty_flip_buffer_work(&msm_uport->rx.tty_work);
+}
+
+static void __exit msm_serial_hs_exit(void)
+{
+ flush_workqueue(msm_hs_workqueue);
+ destroy_workqueue(msm_hs_workqueue);
+ platform_driver_unregister(&msm_serial_hs_platform_driver);
+ uart_unregister_driver(&msm_hs_driver);
+}
+module_exit(msm_serial_hs_exit);
+
+#ifdef CONFIG_PM_RUNTIME
+static int msm_hs_runtime_idle(struct device *dev)
+{
+ /*
+ * returning success from idle results in runtime suspend to be
+ * called
+ */
+ return 0;
+}
+
+static int msm_hs_runtime_resume(struct device *dev)
+{
+ struct platform_device *pdev = container_of(dev, struct
+ platform_device, dev);
+ struct msm_hs_port *msm_uport = &q_uart_port[pdev->id];
+
+ msm_hs_request_clock_on(&msm_uport->uport);
+ return 0;
+}
+
+static int msm_hs_runtime_suspend(struct device *dev)
+{
+ struct platform_device *pdev = container_of(dev, struct
+ platform_device, dev);
+ struct msm_hs_port *msm_uport = &q_uart_port[pdev->id];
+
+ msm_hs_request_clock_off(&msm_uport->uport);
+ return 0;
+}
+#else
+#define msm_hs_runtime_idle NULL
+#define msm_hs_runtime_resume NULL
+#define msm_hs_runtime_suspend NULL
+#endif
+
+static const struct dev_pm_ops msm_hs_dev_pm_ops = {
+ .runtime_suspend = msm_hs_runtime_suspend,
+ .runtime_resume = msm_hs_runtime_resume,
+ .runtime_idle = msm_hs_runtime_idle,
+};
+
+static struct platform_driver msm_serial_hs_platform_driver = {
+ .probe = msm_hs_probe,
+ .remove = __devexit_p(msm_hs_remove),
+ .driver = {
+ .name = "msm_serial_hs",
+ .owner = THIS_MODULE,
+ .pm = &msm_hs_dev_pm_ops,
+ },
+};
+
+static struct uart_driver msm_hs_driver = {
+ .owner = THIS_MODULE,
+ .driver_name = "msm_serial_hs",
+ .dev_name = "ttyHS",
+ .nr = UARTDM_NR,
+ .cons = 0,
+};
+
+static struct uart_ops msm_hs_ops = {
+ .tx_empty = msm_hs_tx_empty,
+ .set_mctrl = msm_hs_set_mctrl_locked,
+ .get_mctrl = msm_hs_get_mctrl_locked,
+ .stop_tx = msm_hs_stop_tx_locked,
+ .start_tx = msm_hs_start_tx_locked,
+ .stop_rx = msm_hs_stop_rx_locked,
+ .enable_ms = msm_hs_enable_ms_locked,
+ .break_ctl = msm_hs_break_ctl,
+ .startup = msm_hs_startup,
+ .shutdown = msm_hs_shutdown,
+ .set_termios = msm_hs_set_termios,
+ .pm = msm_hs_pm,
+ .type = msm_hs_type,
+ .config_port = msm_hs_config_port,
+ .release_port = msm_hs_release_port,
+ .request_port = msm_hs_request_port,
+};
+
+MODULE_DESCRIPTION("High Speed UART Driver for the MSM chipset");
+MODULE_VERSION("1.2");
+MODULE_LICENSE("GPL v2");