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|
/*
* linux/drivers/serial/cpm_uart_cpm2.c
*
* Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
*
* Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
* Pantelis Antoniou (panto@intracom.gr) (CPM1)
*
* Copyright (C) 2004 Freescale Semiconductor, Inc.
* (C) 2004 Intracom, S.A.
* (C) 2006 MontaVista Software, Inc.
* Vitaly Bordug <vbordug@ru.mvista.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/fs_pd.h>
#ifdef CONFIG_PPC_CPM_NEW_BINDING
#include <asm/prom.h>
#endif
#include <linux/serial_core.h>
#include <linux/kernel.h>
#include "cpm_uart.h"
/**************************************************************/
#ifdef CONFIG_PPC_CPM_NEW_BINDING
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{
cpm_command(port->command, cmd);
}
void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
struct device_node *np)
{
void __iomem *pram;
unsigned long offset;
struct resource res;
unsigned long len;
/* Don't remap parameter RAM if it has already been initialized
* during console setup.
*/
if (IS_SMC(port) && port->smcup)
return port->smcup;
else if (!IS_SMC(port) && port->sccup)
return port->sccup;
if (of_address_to_resource(np, 1, &res))
return NULL;
len = 1 + res.end - res.start;
pram = ioremap(res.start, len);
if (!pram)
return NULL;
if (!IS_SMC(port))
return pram;
if (len != 2) {
printk(KERN_WARNING "cpm_uart[%d]: device tree references "
"SMC pram, using boot loader/wrapper pram mapping. "
"Please fix your device tree to reference the pram "
"base register instead.\n",
port->port.line);
return pram;
}
offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
out_be16(pram, offset);
iounmap(pram);
return cpm_muram_addr(offset);
}
void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
{
if (!IS_SMC(port))
iounmap(pram);
}
#else
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{
ulong val;
int line = port - cpm_uart_ports;
volatile cpm_cpm2_t *cp = cpm2_map(im_cpm);
switch (line) {
case UART_SMC1:
val = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0,
cmd) | CPM_CR_FLG;
break;
case UART_SMC2:
val = mk_cr_cmd(CPM_CR_SMC2_PAGE, CPM_CR_SMC2_SBLOCK, 0,
cmd) | CPM_CR_FLG;
break;
case UART_SCC1:
val = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
cmd) | CPM_CR_FLG;
break;
case UART_SCC2:
val = mk_cr_cmd(CPM_CR_SCC2_PAGE, CPM_CR_SCC2_SBLOCK, 0,
cmd) | CPM_CR_FLG;
break;
case UART_SCC3:
val = mk_cr_cmd(CPM_CR_SCC3_PAGE, CPM_CR_SCC3_SBLOCK, 0,
cmd) | CPM_CR_FLG;
break;
case UART_SCC4:
val = mk_cr_cmd(CPM_CR_SCC4_PAGE, CPM_CR_SCC4_SBLOCK, 0,
cmd) | CPM_CR_FLG;
break;
default:
return;
}
cp->cp_cpcr = val;
while (cp->cp_cpcr & CPM_CR_FLG) ;
cpm2_unmap(cp);
}
void smc1_lineif(struct uart_cpm_port *pinfo)
{
volatile iop_cpm2_t *io = cpm2_map(im_ioport);
volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
/* SMC1 is only on port D */
io->iop_ppard |= 0x00c00000;
io->iop_pdird |= 0x00400000;
io->iop_pdird &= ~0x00800000;
io->iop_psord &= ~0x00c00000;
/* Wire BRG1 to SMC1 */
cpmux->cmx_smr &= 0x0f;
pinfo->brg = 1;
cpm2_unmap(cpmux);
cpm2_unmap(io);
}
void smc2_lineif(struct uart_cpm_port *pinfo)
{
volatile iop_cpm2_t *io = cpm2_map(im_ioport);
volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
/* SMC2 is only on port A */
io->iop_ppara |= 0x00c00000;
io->iop_pdira |= 0x00400000;
io->iop_pdira &= ~0x00800000;
io->iop_psora &= ~0x00c00000;
/* Wire BRG2 to SMC2 */
cpmux->cmx_smr &= 0xf0;
pinfo->brg = 2;
cpm2_unmap(cpmux);
cpm2_unmap(io);
}
void scc1_lineif(struct uart_cpm_port *pinfo)
{
volatile iop_cpm2_t *io = cpm2_map(im_ioport);
volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
/* Use Port D for SCC1 instead of other functions. */
io->iop_ppard |= 0x00000003;
io->iop_psord &= ~0x00000001; /* Rx */
io->iop_psord |= 0x00000002; /* Tx */
io->iop_pdird &= ~0x00000001; /* Rx */
io->iop_pdird |= 0x00000002; /* Tx */
/* Wire BRG1 to SCC1 */
cpmux->cmx_scr &= 0x00ffffff;
cpmux->cmx_scr |= 0x00000000;
pinfo->brg = 1;
cpm2_unmap(cpmux);
cpm2_unmap(io);
}
void scc2_lineif(struct uart_cpm_port *pinfo)
{
/*
* STx GP3 uses the SCC2 secondary option pin assignment
* which this driver doesn't account for in the static
* pin assignments. This kind of board specific info
* really has to get out of the driver so boards can
* be supported in a sane fashion.
*/
volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
#ifndef CONFIG_STX_GP3
volatile iop_cpm2_t *io = cpm2_map(im_ioport);
io->iop_pparb |= 0x008b0000;
io->iop_pdirb |= 0x00880000;
io->iop_psorb |= 0x00880000;
io->iop_pdirb &= ~0x00030000;
io->iop_psorb &= ~0x00030000;
#endif
cpmux->cmx_scr &= 0xff00ffff;
cpmux->cmx_scr |= 0x00090000;
pinfo->brg = 2;
cpm2_unmap(cpmux);
cpm2_unmap(io);
}
void scc3_lineif(struct uart_cpm_port *pinfo)
{
volatile iop_cpm2_t *io = cpm2_map(im_ioport);
volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
io->iop_pparb |= 0x008b0000;
io->iop_pdirb |= 0x00880000;
io->iop_psorb |= 0x00880000;
io->iop_pdirb &= ~0x00030000;
io->iop_psorb &= ~0x00030000;
cpmux->cmx_scr &= 0xffff00ff;
cpmux->cmx_scr |= 0x00001200;
pinfo->brg = 3;
cpm2_unmap(cpmux);
cpm2_unmap(io);
}
void scc4_lineif(struct uart_cpm_port *pinfo)
{
volatile iop_cpm2_t *io = cpm2_map(im_ioport);
volatile cpmux_t *cpmux = cpm2_map(im_cpmux);
io->iop_ppard |= 0x00000600;
io->iop_psord &= ~0x00000600; /* Tx/Rx */
io->iop_pdird &= ~0x00000200; /* Rx */
io->iop_pdird |= 0x00000400; /* Tx */
cpmux->cmx_scr &= 0xffffff00;
cpmux->cmx_scr |= 0x0000001b;
pinfo->brg = 4;
cpm2_unmap(cpmux);
cpm2_unmap(io);
}
#endif
/*
* Allocate DP-Ram and memory buffers. We need to allocate a transmit and
* receive buffer descriptors from dual port ram, and a character
* buffer area from host mem. If we are allocating for the console we need
* to do it from bootmem
*/
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
{
int dpmemsz,
|