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kernel-ark/drivers/serial/cpm_uart/cpm_uart_cpm2.c
Scott Wood 15f8c604a7 [POWERPC] cpm: Describe multi-user ram in its own device node. 
The way the current CPM binding describes available multi-user (a.k.a.
dual-ported) RAM doesn't work well when there are multiple free regions,
and it doesn't work at all if the region doesn't begin at the start of
the muram area (as the hardware needs to be programmed with offsets into
this area).  The latter situation can happen with SMC UARTs on CPM2, as its
parameter RAM is relocatable, u-boot puts it at zero, and the kernel doesn't
support moving it.

It is now described with a muram node, similar to QE.  The current CPM
binding is sufficiently recent (i.e. never appeared in an official release)
that compatibility with existing device trees is not an issue.

The code supporting the new binding is shared between cpm1 and cpm2, rather
than remain separated.  QE should be able to use this code as well, once
minor fixes are made to its device trees.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2007-10-04 15:47:05 -05:00

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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>
#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_cpm2_t __iomem *cp = cpm2_map(im_cpm);
out_be32(&cp->cp_cpcr, port->command | cmd | CPM_CR_FLG);
while (in_be32(&cp->cp_cpcr) & CPM_CR_FLG)
;
cpm2_unmap(cp);
}
#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.
*/
#ifndef CONFIG_STX_GP3
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;
#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, memsz;
u8 __iomem *dp_mem;
unsigned long dp_offset;
u8 *mem_addr;
dma_addr_t dma_addr = 0;
pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
dp_offset = cpm_dpalloc(dpmemsz, 8);
if (IS_ERR_VALUE(dp_offset)) {
printk(KERN_ERR
"cpm_uart_cpm.c: could not allocate buffer descriptors\n");
return -ENOMEM;
}
dp_mem = cpm_dpram_addr(dp_offset);
memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
if (is_con) {
mem_addr = alloc_bootmem(memsz);
dma_addr = virt_to_bus(mem_addr);
}
else
mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
GFP_KERNEL);
if (mem_addr == NULL) {
cpm_dpfree(dp_offset);
printk(KERN_ERR
"cpm_uart_cpm.c: could not allocate coherent memory\n");
return -ENOMEM;
}
pinfo->dp_addr = dp_offset;
pinfo->mem_addr = mem_addr;
pinfo->dma_addr = dma_addr;
pinfo->mem_size = memsz;
pinfo->rx_buf = mem_addr;
pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
* pinfo->rx_fifosize);
pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
return 0;
}
void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
{
dma_free_coherent(NULL, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
pinfo->rx_fifosize) +
L1_CACHE_ALIGN(pinfo->tx_nrfifos *
pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
pinfo->dma_addr);
cpm_dpfree(pinfo->dp_addr);
}
#ifndef CONFIG_PPC_CPM_NEW_BINDING
/* Setup any dynamic params in the uart desc */
int cpm_uart_init_portdesc(void)
{
#if defined(CONFIG_SERIAL_CPM_SMC1) || defined(CONFIG_SERIAL_CPM_SMC2)
u16 *addr;
#endif
pr_debug("CPM uart[-]:init portdesc\n");
cpm_uart_nr = 0;
#ifdef CONFIG_SERIAL_CPM_SMC1
cpm_uart_ports[UART_SMC1].smcp = (smc_t *) cpm2_map(im_smc[0]);
cpm_uart_ports[UART_SMC1].port.mapbase =
(unsigned long)cpm_uart_ports[UART_SMC1].smcp;
cpm_uart_ports[UART_SMC1].smcup =
(smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC1], PROFF_SMC_SIZE);
addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC1_BASE], 2);
*addr = PROFF_SMC1;
cpm2_unmap(addr);
cpm_uart_ports[UART_SMC1].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
cpm_uart_ports[UART_SMC1].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
cpm_uart_ports[UART_SMC1].port.uartclk = uart_clock();
cpm_uart_port_map[cpm_uart_nr++] = UART_SMC1;
#endif
#ifdef CONFIG_SERIAL_CPM_SMC2
cpm_uart_ports[UART_SMC2].smcp = (smc_t *) cpm2_map(im_smc[1]);
cpm_uart_ports[UART_SMC2].port.mapbase =
(unsigned long)cpm_uart_ports[UART_SMC2].smcp;
cpm_uart_ports[UART_SMC2].smcup =
(smc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SMC2], PROFF_SMC_SIZE);
addr = (u16 *)cpm2_map_size(im_dprambase[PROFF_SMC2_BASE], 2);
*addr = PROFF_SMC2;
cpm2_unmap(addr);
cpm_uart_ports[UART_SMC2].smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
cpm_uart_ports[UART_SMC2].smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
cpm_uart_ports[UART_SMC2].port.uartclk = uart_clock();
cpm_uart_port_map[cpm_uart_nr++] = UART_SMC2;
#endif
#ifdef CONFIG_SERIAL_CPM_SCC1
cpm_uart_ports[UART_SCC1].sccp = (scc_t *) cpm2_map(im_scc[0]);
cpm_uart_ports[UART_SCC1].port.mapbase =
(unsigned long)cpm_uart_ports[UART_SCC1].sccp;
cpm_uart_ports[UART_SCC1].sccup =
(scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC1], PROFF_SCC_SIZE);
cpm_uart_ports[UART_SCC1].sccp->scc_sccm &=
~(UART_SCCM_TX | UART_SCCM_RX);
cpm_uart_ports[UART_SCC1].sccp->scc_gsmrl &=
~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
cpm_uart_ports[UART_SCC1].port.uartclk = uart_clock();
cpm_uart_port_map[cpm_uart_nr++] = UART_SCC1;
#endif
#ifdef CONFIG_SERIAL_CPM_SCC2
cpm_uart_ports[UART_SCC2].sccp = (scc_t *) cpm2_map(im_scc[1]);
cpm_uart_ports[UART_SCC2].port.mapbase =
(unsigned long)cpm_uart_ports[UART_SCC2].sccp;
cpm_uart_ports[UART_SCC2].sccup =
(scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC2], PROFF_SCC_SIZE);
cpm_uart_ports[UART_SCC2].sccp->scc_sccm &=
~(UART_SCCM_TX | UART_SCCM_RX);
cpm_uart_ports[UART_SCC2].sccp->scc_gsmrl &=
~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
cpm_uart_ports[UART_SCC2].port.uartclk = uart_clock();
cpm_uart_port_map[cpm_uart_nr++] = UART_SCC2;
#endif
#ifdef CONFIG_SERIAL_CPM_SCC3
cpm_uart_ports[UART_SCC3].sccp = (scc_t *) cpm2_map(im_scc[2]);
cpm_uart_ports[UART_SCC3].port.mapbase =
(unsigned long)cpm_uart_ports[UART_SCC3].sccp;
cpm_uart_ports[UART_SCC3].sccup =
(scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC3], PROFF_SCC_SIZE);
cpm_uart_ports[UART_SCC3].sccp->scc_sccm &=
~(UART_SCCM_TX | UART_SCCM_RX);
cpm_uart_ports[UART_SCC3].sccp->scc_gsmrl &=
~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
cpm_uart_ports[UART_SCC3].port.uartclk = uart_clock();
cpm_uart_port_map[cpm_uart_nr++] = UART_SCC3;
#endif
#ifdef CONFIG_SERIAL_CPM_SCC4
cpm_uart_ports[UART_SCC4].sccp = (scc_t *) cpm2_map(im_scc[3]);
cpm_uart_ports[UART_SCC4].port.mapbase =
(unsigned long)cpm_uart_ports[UART_SCC4].sccp;
cpm_uart_ports[UART_SCC4].sccup =
(scc_uart_t *) cpm2_map_size(im_dprambase[PROFF_SCC4], PROFF_SCC_SIZE);
cpm_uart_ports[UART_SCC4].sccp->scc_sccm &=
~(UART_SCCM_TX | UART_SCCM_RX);
cpm_uart_ports[UART_SCC4].sccp->scc_gsmrl &=
~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
cpm_uart_ports[UART_SCC4].port.uartclk = uart_clock();
cpm_uart_port_map[cpm_uart_nr++] = UART_SCC4;
#endif
return 0;
}
#endif
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