From: Andrei Emeltchenko <[email protected]> Access to some registers depends on register access mode Three different modes are available for OMAP (at least) • Operational mode LCR_REG[7] = 0x0 • Configuration mode A LCR_REG[7] = 0x1 and LCR_REG[7:0]! = 0xBF • Configuration mode B LCR_REG[7] = 0x1 and LCR_REG[7:0] = 0xBF
Define access modes and remove redefinitions and magic numbers in serial drivers (and later in bluetooth driver). Signed-off-by: Andrei Emeltchenko <[email protected]> --- arch/arm/mach-omap2/serial.c | 12 ++++---- arch/arm/plat-omap/include/plat/omap-serial.h | 9 ------ drivers/serial/8250.c | 26 +++++++++--------- drivers/serial/omap-serial.c | 34 ++++++++++++------------ include/linux/serial_reg.h | 7 +++++ 5 files changed, 43 insertions(+), 45 deletions(-) diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index edd7c99de38dde5bf877788fb4e48055c0d9fbfa..14c87157d70758d4203593f78f2eaf4c2f2cca68 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -218,7 +218,7 @@ static void omap_uart_save_context(struct omap_uart_state *uart) return; lcr = serial_read_reg(uart, UART_LCR); - serial_write_reg(uart, UART_LCR, 0xBF); + serial_write_reg(uart, UART_LCR, UART_LCR_CONF_MODE_B); uart->dll = serial_read_reg(uart, UART_DLL); uart->dlh = serial_read_reg(uart, UART_DLM); serial_write_reg(uart, UART_LCR, lcr); @@ -226,7 +226,7 @@ static void omap_uart_save_context(struct omap_uart_state *uart) uart->sysc = serial_read_reg(uart, UART_OMAP_SYSC); uart->scr = serial_read_reg(uart, UART_OMAP_SCR); uart->wer = serial_read_reg(uart, UART_OMAP_WER); - serial_write_reg(uart, UART_LCR, 0x80); + serial_write_reg(uart, UART_LCR, UART_LCR_CONF_MODE_A); uart->mcr = serial_read_reg(uart, UART_MCR); serial_write_reg(uart, UART_LCR, lcr); @@ -250,19 +250,19 @@ static void omap_uart_restore_context(struct omap_uart_state *uart) else serial_write_reg(uart, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); - serial_write_reg(uart, UART_LCR, 0xBF); /* Config B mode */ + serial_write_reg(uart, UART_LCR, UART_LCR_CONF_MODE_B); efr = serial_read_reg(uart, UART_EFR); serial_write_reg(uart, UART_EFR, UART_EFR_ECB); serial_write_reg(uart, UART_LCR, 0x0); /* Operational mode */ serial_write_reg(uart, UART_IER, 0x0); - serial_write_reg(uart, UART_LCR, 0xBF); /* Config B mode */ + serial_write_reg(uart, UART_LCR, UART_LCR_CONF_MODE_B); serial_write_reg(uart, UART_DLL, uart->dll); serial_write_reg(uart, UART_DLM, uart->dlh); serial_write_reg(uart, UART_LCR, 0x0); /* Operational mode */ serial_write_reg(uart, UART_IER, uart->ier); - serial_write_reg(uart, UART_LCR, 0x80); + serial_write_reg(uart, UART_LCR, UART_LCR_CONF_MODE_A); serial_write_reg(uart, UART_MCR, uart->mcr); - serial_write_reg(uart, UART_LCR, 0xBF); /* Config B mode */ + serial_write_reg(uart, UART_LCR, UART_LCR_CONF_MODE_B); serial_write_reg(uart, UART_EFR, efr); serial_write_reg(uart, UART_LCR, UART_LCR_WLEN8); serial_write_reg(uart, UART_OMAP_SCR, uart->scr); diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h index 6a17880146111ddfabef564583e464c1c75bb379..b3e0bad9b77eb5138fe01253bd99bfc62bd6ac2d 100644 --- a/arch/arm/plat-omap/include/plat/omap-serial.h +++ b/arch/arm/plat-omap/include/plat/omap-serial.h @@ -33,15 +33,6 @@ #define OMAP_MODE13X_SPEED 230400 -/* - * LCR = 0XBF: Switch to Configuration Mode B. - * In configuration mode b allow access - * to EFR,DLL,DLH. - * Reference OMAP TRM Chapter 17 - * Section: 1.4.3 Mode Selection - */ -#define OMAP_UART_LCR_CONF_MDB 0XBF - /* WER = 0x7F * Enable module level wakeup in WER reg */ diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 4d8e14b7aa931bcf3de11c6e5805005e0bf413ca..aaf9907e6014f547f28a617504125e6ffd177cbe 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -653,13 +653,13 @@ static void serial8250_set_sleep(struct uart_8250_port *p, int sleep) { if (p->capabilities & UART_CAP_SLEEP) { if (p->capabilities & UART_CAP_EFR) { - serial_outp(p, UART_LCR, 0xBF); + serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_B); serial_outp(p, UART_EFR, UART_EFR_ECB); serial_outp(p, UART_LCR, 0); } serial_outp(p, UART_IER, sleep ? UART_IERX_SLEEP : 0); if (p->capabilities & UART_CAP_EFR) { - serial_outp(p, UART_LCR, 0xBF); + serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_B); serial_outp(p, UART_EFR, 0); serial_outp(p, UART_LCR, 0); } @@ -752,7 +752,7 @@ static int size_fifo(struct uart_8250_port *up) serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); serial_outp(up, UART_MCR, UART_MCR_LOOP); - serial_outp(up, UART_LCR, UART_LCR_DLAB); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A); old_dl = serial_dl_read(up); serial_dl_write(up, 0x0001); serial_outp(up, UART_LCR, 0x03); @@ -764,7 +764,7 @@ static int size_fifo(struct uart_8250_port *up) serial_inp(up, UART_RX); serial_outp(up, UART_FCR, old_fcr); serial_outp(up, UART_MCR, old_mcr); - serial_outp(up, UART_LCR, UART_LCR_DLAB); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A); serial_dl_write(up, old_dl); serial_outp(up, UART_LCR, old_lcr); @@ -782,7 +782,7 @@ static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p) unsigned int id; old_lcr = serial_inp(p, UART_LCR); - serial_outp(p, UART_LCR, UART_LCR_DLAB); + serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_A); old_dll = serial_inp(p, UART_DLL); old_dlm = serial_inp(p, UART_DLM); @@ -836,7 +836,7 @@ static void autoconfig_has_efr(struct uart_8250_port *up) * recommended for new designs). */ up->acr = 0; - serial_out(up, UART_LCR, 0xBF); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_out(up, UART_EFR, UART_EFR_ECB); serial_out(up, UART_LCR, 0x00); id1 = serial_icr_read(up, UART_ID1); @@ -945,7 +945,7 @@ static void autoconfig_16550a(struct uart_8250_port *up) * Check for presence of the EFR when DLAB is set. * Only ST16C650V1 UARTs pass this test. */ - serial_outp(up, UART_LCR, UART_LCR_DLAB); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A); if (serial_in(up, UART_EFR) == 0) { serial_outp(up, UART_EFR, 0xA8); if (serial_in(up, UART_EFR) != 0) { @@ -963,7 +963,7 @@ static void autoconfig_16550a(struct uart_8250_port *up) * Maybe it requires 0xbf to be written to the LCR. * (other ST16C650V2 UARTs, TI16C752A, etc) */ - serial_outp(up, UART_LCR, 0xBF); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B); if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) { DEBUG_AUTOCONF("EFRv2 "); autoconfig_has_efr(up); @@ -1024,7 +1024,7 @@ static void autoconfig_16550a(struct uart_8250_port *up) serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); status1 = serial_in(up, UART_IIR) >> 5; serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); - serial_outp(up, UART_LCR, UART_LCR_DLAB); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A); serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE); status2 = serial_in(up, UART_IIR) >> 5; serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO); @@ -1183,7 +1183,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) * We also initialise the EFR (if any) to zero for later. The * EFR occupies the same register location as the FCR and IIR. */ - serial_outp(up, UART_LCR, 0xBF); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_outp(up, UART_EFR, 0); serial_outp(up, UART_LCR, 0); @@ -1952,7 +1952,7 @@ static int serial8250_startup(struct uart_port *port) if (up->port.type == PORT_16C950) { /* Wake up and initialize UART */ up->acr = 0; - serial_outp(up, UART_LCR, 0xBF); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_outp(up, UART_EFR, UART_EFR_ECB); serial_outp(up, UART_IER, 0); serial_outp(up, UART_LCR, 0); @@ -2002,7 +2002,7 @@ static int serial8250_startup(struct uart_port *port) if (up->port.type == PORT_16850) { unsigned char fctr; - serial_outp(up, UART_LCR, 0xbf); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B); fctr = serial_inp(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); serial_outp(up, UART_FCTR, fctr | UART_FCTR_TRGD | UART_FCTR_RX); @@ -2363,7 +2363,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, if (termios->c_cflag & CRTSCTS) efr |= UART_EFR_CTS; - serial_outp(up, UART_LCR, 0xBF); + serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_outp(up, UART_EFR, efr); } diff --git a/drivers/serial/omap-serial.c b/drivers/serial/omap-serial.c index 03a96db67de4a5b3120e094b25e10e2364b8be86..1201eff1831e976910cefebed09882c26e2fcf01 100644 --- a/drivers/serial/omap-serial.c +++ b/drivers/serial/omap-serial.c @@ -570,7 +570,7 @@ serial_omap_configure_xonxoff unsigned char efr = 0; up->lcr = serial_in(up, UART_LCR); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); up->efr = serial_in(up, UART_EFR); serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB); @@ -598,7 +598,7 @@ serial_omap_configure_xonxoff efr |= OMAP_UART_SW_RX; serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); up->mcr = serial_in(up, UART_MCR); @@ -612,14 +612,14 @@ serial_omap_configure_xonxoff up->mcr |= UART_MCR_XONANY; serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); /* Enable special char function UARTi.EFR_REG[5] and * load the new software flow control mode IXON or IXOFF * and restore the UARTi.EFR_REG[4] ENHANCED_EN value. */ serial_out(up, UART_EFR, efr | UART_EFR_SCD); - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR); serial_out(up, UART_LCR, up->lcr); @@ -724,22 +724,22 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, * baud clock is not running * DLL_REG and DLH_REG set to 0. */ - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); serial_out(up, UART_DLL, 0); serial_out(up, UART_DLM, 0); serial_out(up, UART_LCR, 0); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); up->efr = serial_in(up, UART_EFR); serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); up->mcr = serial_in(up, UART_MCR); serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); /* FIFO ENABLE, DMA MODE */ serial_out(up, UART_FCR, up->fcr); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); if (up->use_dma) { serial_out(up, UART_TI752_TLR, 0); @@ -748,27 +748,27 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, } serial_out(up, UART_EFR, up->efr); - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); serial_out(up, UART_MCR, up->mcr); /* Protocol, Baud Rate, and Interrupt Settings */ serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); up->efr = serial_in(up, UART_EFR); serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); serial_out(up, UART_LCR, 0); serial_out(up, UART_IER, 0); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ serial_out(up, UART_LCR, 0); serial_out(up, UART_IER, up->ier); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_out(up, UART_EFR, up->efr); serial_out(up, UART_LCR, cval); @@ -782,18 +782,18 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, if (termios->c_cflag & CRTSCTS) { efr |= (UART_EFR_CTS | UART_EFR_RTS); - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); up->mcr = serial_in(up, UART_MCR); serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); up->efr = serial_in(up, UART_EFR); serial_out(up, UART_EFR, up->efr | UART_EFR_ECB); serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG); serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */ - serial_out(up, UART_LCR, UART_LCR_DLAB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A); serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS); serial_out(up, UART_LCR, cval); } @@ -815,13 +815,13 @@ serial_omap_pm(struct uart_port *port, unsigned int state, unsigned char efr; dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); efr = serial_in(up, UART_EFR); serial_out(up, UART_EFR, efr | UART_EFR_ECB); serial_out(up, UART_LCR, 0); serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0); - serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); serial_out(up, UART_EFR, efr); serial_out(up, UART_LCR, 0); /* Enable module level wake up */ diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h index 6f3823474e6c070bd8456d4dd70559f4e18f2500..3ecb71a9e505901c1a0ff3a3780ba29d3c4c3741 100644 --- a/include/linux/serial_reg.h +++ b/include/linux/serial_reg.h @@ -99,6 +99,13 @@ #define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */ #define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */ +/* + * Access to some registers depends on register access / configuration + * mode. + */ +#define UART_LCR_CONF_MODE_A UART_LCR_DLAB /* Configutation mode A */ +#define UART_LCR_CONF_MODE_B 0xBF /* Configutation mode B */ + #define UART_MCR 4 /* Out: Modem Control Register */ #define UART_MCR_CLKSEL 0x80 /* Divide clock by 4 (TI16C752, EFR[4]=1) */ #define UART_MCR_TCRTLR 0x40 /* Access TCR/TLR (TI16C752, EFR[4]=1) */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
