Release 4.14 arch/powerpc/boot/cpm-serial.c
// SPDX-License-Identifier: GPL-2.0
/*
* 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"
#include "page.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;
u16 mrblr;
u32 rstate;
u8 res1[4];
u16 rbptr;
u8 res2[6];
u32 tstate;
u8 res3[4];
u16 tbptr;
u8 res4[6];
u16 maxidl;
u16 idlc;
u16 brkln;
u16 brkec;
u16 brkcr;
u16 rmask;
u8 res5[4];
};
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;
static struct cpm_bd *tbdf, *rbdf;
static u32 cpm_cmd;
static void *cbd_addr;
static u32 cbd_offset;
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)
;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
static void cpm2_cmd(int op)
{
while (in_be32(cpcr) & 0x10000)
;
out_be32(cpcr, op | cpm_cmd | 0x10000);
while (in_be32(cpcr) & 0x10000)
;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 40 | 100.00% | 1 | 100.00% |
| Total | 40 | 100.00% | 1 | 100.00% |
static void smc_disable_port(void)
{
do_cmd(CPM_CMD_STOP_TX);
out_be16(&smc->smcmr, in_be16(&smc->smcmr) & ~3);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static void scc_disable_port(void)
{
do_cmd(CPM_CMD_STOP_TX);
out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) & ~0x30);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static void smc_enable_port(void)
{
out_be16(&smc->smcmr, in_be16(&smc->smcmr) | 3);
do_cmd(CPM_CMD_RESTART_TX);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
static void scc_enable_port(void)
{
out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) | 0x30);
do_cmd(CPM_CMD_RESTART_TX);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
static int cpm_serial_open(void)
{
disable_port();
out_8(¶m->rfcr, 0x10);
out_8(¶m->tfcr, 0x10);
out_be16(¶m->mrblr, 1);
out_be16(¶m->maxidl, 0);
out_be16(¶m->brkec, 0);
out_be16(¶m->brkln, 0);
out_be16(¶m->brkcr, 0);
rbdf = cbd_addr;
rbdf->addr = (u8 *)rbdf - 1;
rbdf->sc = 0xa000;
rbdf->len = 1;
tbdf = rbdf + 1;
tbdf->addr = (u8 *)rbdf - 2;
tbdf->sc = 0x2000;
tbdf->len = 1;
sync();
out_be16(¶m->rbase, cbd_offset);
out_be16(¶m->tbase, cbd_offset + sizeof(struct cpm_bd));
do_cmd(CPM_CMD_INIT_RX_TX);
enable_port();
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 123 | 68.72% | 1 | 50.00% |
| Laurent Pinchart | 56 | 31.28% | 1 | 50.00% |
| Total | 179 | 100.00% | 2 | 100.00% |
static void cpm_serial_putc(unsigned char c)
{
while (tbdf->sc & 0x8000)
barrier();
sync();
tbdf->addr[0] = c;
eieio();
tbdf->sc |= 0x8000;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
static unsigned char cpm_serial_tstc(void)
{
barrier();
return !(rbdf->sc & 0x8000);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 44 | 100.00% | 1 | 100.00% |
| Total | 44 | 100.00% | 1 | 100.00% |
int cpm_console_init(void *devp, struct serial_console_data *scdp)
{
void *vreg[2];
u32 reg[2];
int is_smc = 0, is_cpm2 = 0;
void *parent, *muram;
void *muram_addr;
unsigned long muram_offset, muram_size;
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;
if (getprop(devp, "fsl,cpm-command", &cpm_cmd, 4) < 4)
return -1;
if (dt_get_virtual_reg(devp, vreg, 2) < 2)
return -1;
if (is_smc)
smc = vreg[0];
else
scc = vreg[0];
param = vreg[1];
parent = get_parent(devp);
if (!parent)
return -1;
if (dt_get_virtual_reg(parent, &cpcr, 1) < 1)
return -1;
muram = finddevice("/soc/cpm/muram/data");
if (!muram)
return -1;
/* For bootwrapper-compatible device trees, we assume that the first
* entry has at least 128 bytes, and that #address-cells/#data-cells
* is one for both parent and child.
*/
if (dt_get_virtual_reg(muram, &muram_addr, 1) < 1)
return -1;
if (getprop(muram, "reg", reg, 8) < 8)
return -1;
muram_offset = reg[0];
muram_size = reg[1];
/* Store the buffer descriptors at the end of the first muram chunk.
* For SMC ports on CPM2-based platforms, relocate the parameter RAM
* just before the buffer descriptors.
*/
cbd_offset = muram_offset + muram_size - 2 * sizeof(struct cpm_bd);
if (is_cpm2 && is_smc) {
u16 *smc_base = (u16 *)param;
u16 pram_offset;
pram_offset = cbd_offset - 64;
pram_offset = _ALIGN_DOWN(pram_offset, 64);
disable_port();
out_be16(smc_base, pram_offset);
param = muram_addr - muram_offset + pram_offset;
}
cbd_addr = muram_addr - muram_offset + cbd_offset;
scdp->open = cpm_serial_open;
scdp->putc = cpm_serial_putc;
scdp->getc = cpm_serial_getc;
scdp->tstc = cpm_serial_tstc;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 277 | 67.40% | 2 | 50.00% |
| Laurent Pinchart | 134 | 32.60% | 2 | 50.00% |
| Total | 411 | 100.00% | 4 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Scott Wood | 935 | 78.18% | 2 | 40.00% |
| Laurent Pinchart | 260 | 21.74% | 2 | 40.00% |
| Greg Kroah-Hartman | 1 | 0.08% | 1 | 20.00% |
| Total | 1196 | 100.00% | 5 | 100.00% |
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