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/*
* CPM serial console support.
*
* Copyright 2007 Freescale Semiconductor, Inc.
* Author: Scott Wood <scottwood@freescale.com>
*
* It is assumed that the firmware (or the platform file) has already set
* up the port.
*/
#include "types.h"
#include "io.h"
#include "ops.h"
struct cpm_scc {
u32 gsmrl;
u32 gsmrh;
u16 psmr;
u8 res1[2];
u16 todr;
u16 dsr;
u16 scce;
u8 res2[2];
u16 sccm;
u8 res3;
u8 sccs;
u8 res4[8];
};
struct cpm_smc {
u8 res1[2];
u16 smcmr;
u8 res2[2];
u8 smce;
u8 res3[3];
u8 smcm;
u8 res4[5];
};
struct cpm_param {
u16 rbase;
u16 tbase;
u8 rfcr;
u8 tfcr;
};
struct cpm_bd {
u16 sc; /* Status and Control */
u16 len; /* Data length in buffer */
u8 *addr; /* Buffer address in host memory */
};
static void *cpcr;
static struct cpm_param *param;
static struct cpm_smc *smc;
static struct cpm_scc *scc;
struct cpm_bd *tbdf, *rbdf;
static u32 cpm_cmd;
static u8 *dpram_start;
static void (*do_cmd)(int op);
static void (*enable_port)(void);
static void (*disable_port)(void);
#define CPM_CMD_STOP_TX 4
#define CPM_CMD_RESTART_TX 6
#define CPM_CMD_INIT_RX_TX 0
static void cpm1_cmd(int op)
{
while (in_be16(cpcr) & 1)
;
out_be16(cpcr, (op << 8) | cpm_cmd | 1);
while (in_be16(cpcr) & 1)
;
}
static void cpm2_cmd(int op)
{
while (in_be32(cpcr) & 0x10000)
;
out_be32(cpcr, op | cpm_cmd | 0x10000);
while (in_be32(cpcr) & 0x10000)
;
}
static void smc_disable_port(void)
{
do_cmd(CPM_CMD_STOP_TX);
out_be16(&smc->smcmr, in_be16(&smc->smcmr) & ~3);
}
static void scc_disable_port(void)
{
do_cmd(CPM_CMD_STOP_TX);
out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) & ~0x30);
}
static void smc_enable_port(void)
{
out_be16(&smc->smcmr, in_be16(&smc->smcmr) | 3);
do_cmd(CPM_CMD_RESTART_TX);
}
static void scc_enable_port(void)
{
out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) | 0x30);
do_cmd(CPM_CMD_RESTART_TX);
}
static int cpm_serial_open(void)
{
int dpaddr = 0x800;
disable_port();
out_8(¶m->rfcr, 0x10);
out_8(¶m->tfcr, 0x10);
rbdf = (struct cpm_bd *)(dpram_start + dpaddr);
rbdf->addr = (u8 *)(rbdf + 2);
rbdf->sc = 0xa000;
rbdf->len = 1;
tbdf = rbdf + 1;
tbdf->addr = (u8 *)(rbdf + 2) + 1;
tbdf->sc = 0x2000;
tbdf->len = 1;
sync();
out_be16(¶m->rbase, dpaddr);
out_be16(¶m->tbase, dpaddr + sizeof(struct cpm_bd));
do_cmd(CPM_CMD_INIT_RX_TX);
enable_port();
return 0;
}
static void cpm_serial_putc(unsigned char c)
{
while (tbdf->sc & 0x8000)
barrier();
sync();
tbdf->addr[0] = c;
eieio();
tbdf->sc |= 0x8000;
}
static unsigned char cpm_serial_tstc(void)
{
barrier();
return !(rbdf->sc & 0x8000);
}
static unsigned char cpm_serial_getc(void)
{
unsigned char c;
while (!cpm_serial_tstc())
;
sync();
c = rbdf->addr[0];
eieio();
rbdf->sc |= 0x8000;
return c;
}
int cpm_console_init(void *devp, struct serial_console_data *scdp)
{
void *reg_virt[2];
int is_smc = 0, is_cpm2 = 0, n;
unsigned long reg_phys;
void *parent;
if (dt_is_compatible(devp, "fsl,cpm1-smc-uart")) {
is_smc = 1;
} else if (dt_is_compatible(devp, "fsl,cpm2-scc-uart")) {
is_cpm2 = 1;
} else if (dt_is_compatible(devp, "fsl,cpm2-smc-uart")) {
is_cpm2 = 1;
is_smc = 1;
}
if (is_smc) {
enable_port = smc_enable_port;
disable_port = smc_disable_port;
} else {
enable_port = scc_enable_port;
disable_port = scc_disable_port;
}
if (is_cpm2)
do_cmd = cpm2_cmd;
else
do_cmd = cpm1_cmd;
n = getprop(devp, "fsl,cpm-command", &cpm_cmd, 4);
if (n < 4)
return -1;
n = getprop(devp, "virtual-reg", reg_virt, sizeof(reg_virt));
if (n < (int)sizeof(reg_virt)) {
for (n = 0; n < 2; n++) {
if (!dt_xlate_reg(devp, n, ®_phys, NULL))
return -1;
reg_virt[n] = (void *)reg_phys;
}
}
if (is_smc)
smc = reg_virt[0];
else
scc = reg_virt[0];
param = reg_virt[1];
parent = get_parent(devp);
if (!parent)
return -1;
n = getprop(parent, "virtual-reg", reg_virt, sizeof(reg_virt));
if (n < (int)sizeof(reg_virt)) {
for (n = 0; n < 2; n++) {
if (!dt_xlate_reg(parent, n, ®_phys, NULL))
return -1;
reg_virt[n] = (void *)reg_phys;
}
}
cpcr = reg_virt[0];
dpram_start = reg_virt[1];
scdp->open = cpm_serial_open;
scdp->putc = cpm_serial_putc;
scdp->getc = cpm_serial_getc;
scdp->tstc = cpm_serial_tstc;
return 0;
}
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