diff options
Diffstat (limited to 'arch/ppc/boot/simple/mpc52xx_tty.c')
| -rw-r--r-- | arch/ppc/boot/simple/mpc52xx_tty.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/arch/ppc/boot/simple/mpc52xx_tty.c b/arch/ppc/boot/simple/mpc52xx_tty.c deleted file mode 100644 index 6955891fb03..00000000000 --- a/arch/ppc/boot/simple/mpc52xx_tty.c +++ /dev/null @@ -1,137 +0,0 @@ -/* - * Minimal serial functions needed to send messages out a MPC52xx - * Programmable Serial Controller (PSC). - * - * Author: Dale Farnsworth <dfarnsworth@mvista.com> - * - * 2003-2004 (c) MontaVista, Software, Inc. This file is licensed under the - * terms of the GNU General Public License version 2. This program is licensed - * "as is" without any warranty of any kind, whether express or implied. - */ - -#include <linux/types.h> -#include <asm/uaccess.h> -#include <asm/mpc52xx.h> -#include <asm/mpc52xx_psc.h> -#include <asm/serial.h> -#include <asm/io.h> -#include <asm/time.h> - - -#ifdef MPC52xx_PF_CONSOLE_PORT -#define MPC52xx_CONSOLE MPC52xx_PSCx_OFFSET(MPC52xx_PF_CONSOLE_PORT) -#define MPC52xx_PSC_CONFIG_SHIFT ((MPC52xx_PF_CONSOLE_PORT-1)<<2) -#else -#error "MPC52xx_PF_CONSOLE_PORT not defined" -#endif - -static struct mpc52xx_psc __iomem *psc = - (struct mpc52xx_psc __iomem *) MPC52xx_PA(MPC52xx_CONSOLE); - -/* The decrementer counts at the system bus clock frequency - * divided by four. The most accurate time base is connected to the - * rtc. We read the decrementer change during one rtc tick - * and multiply by 4 to get the system bus clock frequency. Since a - * rtc tick is one seconds, and that's pretty long, we change the rtc - * dividers temporarily to set them 64x faster ;) - */ -static int -mpc52xx_ipbfreq(void) -{ - struct mpc52xx_rtc __iomem *rtc = - (struct mpc52xx_rtc __iomem *) MPC52xx_PA(MPC52xx_RTC_OFFSET); - struct mpc52xx_cdm __iomem *cdm = - (struct mpc52xx_cdm __iomem *) MPC52xx_PA(MPC52xx_CDM_OFFSET); - int current_time, previous_time; - int tbl_start, tbl_end; - int xlbfreq, ipbfreq; - - out_be32(&rtc->dividers, 0x8f1f0000); /* Set RTC 64x faster */ - previous_time = in_be32(&rtc->time); - while ((current_time = in_be32(&rtc->time)) == previous_time) ; - tbl_start = get_tbl(); - previous_time = current_time; - while ((current_time = in_be32(&rtc->time)) == previous_time) ; - tbl_end = get_tbl(); - out_be32(&rtc->dividers, 0xffff0000); /* Restore RTC */ - - xlbfreq = (tbl_end - tbl_start) << 8; - ipbfreq = (in_8(&cdm->ipb_clk_sel) & 1) ? xlbfreq / 2 : xlbfreq; - - return ipbfreq; -} - -unsigned long -serial_init(int ignored, void *ignored2) -{ - struct mpc52xx_gpio __iomem *gpio = - (struct mpc52xx_gpio __iomem *) MPC52xx_PA(MPC52xx_GPIO_OFFSET); - int divisor; - int mode1; - int mode2; - u32 val32; - - static int been_here = 0; - - if (been_here) - return 0; - - been_here = 1; - - val32 = in_be32(&gpio->port_config); - val32 &= ~(0x7 << MPC52xx_PSC_CONFIG_SHIFT); - val32 |= MPC52xx_GPIO_PSC_CONFIG_UART_WITHOUT_CD - << MPC52xx_PSC_CONFIG_SHIFT; - out_be32(&gpio->port_config, val32); - - out_8(&psc->command, MPC52xx_PSC_RST_TX - | MPC52xx_PSC_RX_DISABLE | MPC52xx_PSC_TX_ENABLE); - out_8(&psc->command, MPC52xx_PSC_RST_RX); - - out_be32(&psc->sicr, 0x0); - out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00); - out_be16(&psc->tfalarm, 0xf8); - - out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1 - | MPC52xx_PSC_RX_ENABLE - | MPC52xx_PSC_TX_ENABLE); - - divisor = ((mpc52xx_ipbfreq() - / (CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD * 16)) + 1) >> 1; - - mode1 = MPC52xx_PSC_MODE_8_BITS | MPC52xx_PSC_MODE_PARNONE - | MPC52xx_PSC_MODE_ERR; - mode2 = MPC52xx_PSC_MODE_ONE_STOP; - - out_8(&psc->ctur, divisor>>8); - out_8(&psc->ctlr, divisor); - out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1); - out_8(&psc->mode, mode1); - out_8(&psc->mode, mode2); - - return 0; /* ignored */ -} - -void -serial_putc(void *ignored, const char c) -{ - serial_init(0, NULL); - - while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP)) ; - out_8(&psc->mpc52xx_psc_buffer_8, c); - while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_TXEMP)) ; -} - -char -serial_getc(void *ignored) -{ - while (!(in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY)) ; - - return in_8(&psc->mpc52xx_psc_buffer_8); -} - -int -serial_tstc(void *ignored) -{ - return (in_be16(&psc->mpc52xx_psc_status) & MPC52xx_PSC_SR_RXRDY) != 0; -} |