diff options
Diffstat (limited to 'drivers/tty/serial/msm_serial.c')
| -rw-r--r-- | drivers/tty/serial/msm_serial.c | 197 |
1 files changed, 181 insertions, 16 deletions
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index b7d80bd57db9..7312e7e01b7e 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -19,33 +19,147 @@ # define SUPPORT_SYSRQ #endif +#include <linux/kernel.h> #include <linux/atomic.h> #include <linux/dma-mapping.h> #include <linux/dmaengine.h> -#include <linux/hrtimer.h> #include <linux/module.h> #include <linux/io.h> #include <linux/ioport.h> -#include <linux/irq.h> +#include <linux/interrupt.h> #include <linux/init.h> #include <linux/console.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/serial_core.h> -#include <linux/serial.h> #include <linux/slab.h> #include <linux/clk.h> #include <linux/platform_device.h> #include <linux/delay.h> #include <linux/of.h> #include <linux/of_device.h> - -#include "msm_serial.h" - -#define UARTDM_BURST_SIZE 16 /* in bytes */ -#define UARTDM_TX_AIGN(x) ((x) & ~0x3) /* valid for > 1p3 */ -#define UARTDM_TX_MAX 256 /* in bytes, valid for <= 1p3 */ -#define UARTDM_RX_SIZE (UART_XMIT_SIZE / 4) +#include <linux/wait.h> + +#define UART_MR1 0x0000 + +#define UART_MR1_AUTO_RFR_LEVEL0 0x3F +#define UART_MR1_AUTO_RFR_LEVEL1 0x3FF00 +#define UART_DM_MR1_AUTO_RFR_LEVEL1 0xFFFFFF00 +#define UART_MR1_RX_RDY_CTL BIT(7) +#define UART_MR1_CTS_CTL BIT(6) + +#define UART_MR2 0x0004 +#define UART_MR2_ERROR_MODE BIT(6) +#define UART_MR2_BITS_PER_CHAR 0x30 +#define UART_MR2_BITS_PER_CHAR_5 (0x0 << 4) +#define UART_MR2_BITS_PER_CHAR_6 (0x1 << 4) +#define UART_MR2_BITS_PER_CHAR_7 (0x2 << 4) +#define UART_MR2_BITS_PER_CHAR_8 (0x3 << 4) +#define UART_MR2_STOP_BIT_LEN_ONE (0x1 << 2) +#define UART_MR2_STOP_BIT_LEN_TWO (0x3 << 2) +#define UART_MR2_PARITY_MODE_NONE 0x0 +#define UART_MR2_PARITY_MODE_ODD 0x1 +#define UART_MR2_PARITY_MODE_EVEN 0x2 +#define UART_MR2_PARITY_MODE_SPACE 0x3 +#define UART_MR2_PARITY_MODE 0x3 + +#define UART_CSR 0x0008 + +#define UART_TF 0x000C +#define UARTDM_TF 0x0070 + +#define UART_CR 0x0010 +#define UART_CR_CMD_NULL (0 << 4) +#define UART_CR_CMD_RESET_RX (1 << 4) +#define UART_CR_CMD_RESET_TX (2 << 4) +#define UART_CR_CMD_RESET_ERR (3 << 4) +#define UART_CR_CMD_RESET_BREAK_INT (4 << 4) +#define UART_CR_CMD_START_BREAK (5 << 4) +#define UART_CR_CMD_STOP_BREAK (6 << 4) +#define UART_CR_CMD_RESET_CTS (7 << 4) +#define UART_CR_CMD_RESET_STALE_INT (8 << 4) +#define UART_CR_CMD_PACKET_MODE (9 << 4) +#define UART_CR_CMD_MODE_RESET (12 << 4) +#define UART_CR_CMD_SET_RFR (13 << 4) +#define UART_CR_CMD_RESET_RFR (14 << 4) +#define UART_CR_CMD_PROTECTION_EN (16 << 4) +#define UART_CR_CMD_STALE_EVENT_DISABLE (6 << 8) +#define UART_CR_CMD_STALE_EVENT_ENABLE (80 << 4) +#define UART_CR_CMD_FORCE_STALE (4 << 8) +#define UART_CR_CMD_RESET_TX_READY (3 << 8) +#define UART_CR_TX_DISABLE BIT(3) +#define UART_CR_TX_ENABLE BIT(2) +#define UART_CR_RX_DISABLE BIT(1) +#define UART_CR_RX_ENABLE BIT(0) +#define UART_CR_CMD_RESET_RXBREAK_START ((1 << 11) | (2 << 4)) + +#define UART_IMR 0x0014 +#define UART_IMR_TXLEV BIT(0) +#define UART_IMR_RXSTALE BIT(3) +#define UART_IMR_RXLEV BIT(4) +#define UART_IMR_DELTA_CTS BIT(5) +#define UART_IMR_CURRENT_CTS BIT(6) +#define UART_IMR_RXBREAK_START BIT(10) + +#define UART_IPR_RXSTALE_LAST 0x20 +#define UART_IPR_STALE_LSB 0x1F +#define UART_IPR_STALE_TIMEOUT_MSB 0x3FF80 +#define UART_DM_IPR_STALE_TIMEOUT_MSB 0xFFFFFF80 + +#define UART_IPR 0x0018 +#define UART_TFWR 0x001C +#define UART_RFWR 0x0020 +#define UART_HCR 0x0024 + +#define UART_MREG 0x0028 +#define UART_NREG 0x002C +#define UART_DREG 0x0030 +#define UART_MNDREG 0x0034 +#define UART_IRDA 0x0038 +#define UART_MISR_MODE 0x0040 +#define UART_MISR_RESET 0x0044 +#define UART_MISR_EXPORT 0x0048 +#define UART_MISR_VAL 0x004C +#define UART_TEST_CTRL 0x0050 + +#define UART_SR 0x0008 +#define UART_SR_HUNT_CHAR BIT(7) +#define UART_SR_RX_BREAK BIT(6) +#define UART_SR_PAR_FRAME_ERR BIT(5) +#define UART_SR_OVERRUN BIT(4) +#define UART_SR_TX_EMPTY BIT(3) +#define UART_SR_TX_READY BIT(2) +#define UART_SR_RX_FULL BIT(1) +#define UART_SR_RX_READY BIT(0) + +#define UART_RF 0x000C +#define UARTDM_RF 0x0070 +#define UART_MISR 0x0010 +#define UART_ISR 0x0014 +#define UART_ISR_TX_READY BIT(7) + +#define UARTDM_RXFS 0x50 +#define UARTDM_RXFS_BUF_SHIFT 0x7 +#define UARTDM_RXFS_BUF_MASK 0x7 + +#define UARTDM_DMEN 0x3C +#define UARTDM_DMEN_RX_SC_ENABLE BIT(5) +#define UARTDM_DMEN_TX_SC_ENABLE BIT(4) + +#define UARTDM_DMEN_TX_BAM_ENABLE BIT(2) /* UARTDM_1P4 */ +#define UARTDM_DMEN_TX_DM_ENABLE BIT(0) /* < UARTDM_1P4 */ + +#define UARTDM_DMEN_RX_BAM_ENABLE BIT(3) /* UARTDM_1P4 */ +#define UARTDM_DMEN_RX_DM_ENABLE BIT(1) /* < UARTDM_1P4 */ + +#define UARTDM_DMRX 0x34 +#define UARTDM_NCF_TX 0x40 +#define UARTDM_RX_TOTAL_SNAP 0x38 + +#define UARTDM_BURST_SIZE 16 /* in bytes */ +#define UARTDM_TX_AIGN(x) ((x) & ~0x3) /* valid for > 1p3 */ +#define UARTDM_TX_MAX 256 /* in bytes, valid for <= 1p3 */ +#define UARTDM_RX_SIZE (UART_XMIT_SIZE / 4) enum { UARTDM_1P1 = 1, @@ -78,10 +192,65 @@ struct msm_port { struct msm_dma rx_dma; }; +#define UART_TO_MSM(uart_port) container_of(uart_port, struct msm_port, uart) + +static +void msm_write(struct uart_port *port, unsigned int val, unsigned int off) +{ + writel_relaxed(val, port->membase + off); +} + +static +unsigned int msm_read(struct uart_port *port, unsigned int off) +{ + return readl_relaxed(port->membase + off); +} + +/* + * Setup the MND registers to use the TCXO clock. + */ +static void msm_serial_set_mnd_regs_tcxo(struct uart_port *port) +{ + msm_write(port, 0x06, UART_MREG); + msm_write(port, 0xF1, UART_NREG); + msm_write(port, 0x0F, UART_DREG); + msm_write(port, 0x1A, UART_MNDREG); + port->uartclk = 1843200; +} + +/* + * Setup the MND registers to use the TCXO clock divided by 4. + */ +static void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port) +{ + msm_write(port, 0x18, UART_MREG); + msm_write(port, 0xF6, UART_NREG); + msm_write(port, 0x0F, UART_DREG); + msm_write(port, 0x0A, UART_MNDREG); + port->uartclk = 1843200; +} + +static void msm_serial_set_mnd_regs(struct uart_port *port) +{ + struct msm_port *msm_port = UART_TO_MSM(port); + + /* + * These registers don't exist so we change the clk input rate + * on uartdm hardware instead + */ + if (msm_port->is_uartdm) + return; + + if (port->uartclk == 19200000) + msm_serial_set_mnd_regs_tcxo(port); + else if (port->uartclk == 4800000) + msm_serial_set_mnd_regs_tcxoby4(port); +} + static void msm_handle_tx(struct uart_port *port); static void msm_start_rx_dma(struct msm_port *msm_port); -void msm_stop_dma(struct uart_port *port, struct msm_dma *dma) +static void msm_stop_dma(struct uart_port *port, struct msm_dma *dma) { struct device *dev = port->dev; unsigned int mapped; @@ -388,10 +557,6 @@ static void msm_complete_rx_dma(void *args) val &= ~dma->enable_bit; msm_write(port, val, UARTDM_DMEN); - /* Restore interrupts */ - msm_port->imr |= UART_IMR_RXLEV | UART_IMR_RXSTALE; - msm_write(port, msm_port->imr, UART_IMR); - if (msm_read(port, UART_SR) & UART_SR_OVERRUN) { port->icount.overrun++; tty_insert_flip_char(tport, 0, TTY_OVERRUN); @@ -726,7 +891,7 @@ static void msm_handle_tx(struct uart_port *port) return; } - pio_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); + pio_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); dma_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); dma_min = 1; /* Always DMA */ |