From d0f53fafc016b3f4f20f63ecf52f6df8774bcb3c Mon Sep 17 00:00:00 2001 From: Scott Wood Date: Tue, 21 Aug 2007 03:39:57 +1000 Subject: [POWERPC] bootwrapper: Add CPM serial driver This serial port is used on all 8xx, many 82xx, and some 85xx chips. The driver requires that the port has already been set up by the firmware and/or platform code. Signed-off-by: Scott Wood Acked-by: David Gibson Signed-off-by: Paul Mackerras --- arch/powerpc/boot/cpm-serial.c | 249 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 249 insertions(+) create mode 100644 arch/powerpc/boot/cpm-serial.c (limited to 'arch/powerpc/boot/cpm-serial.c') diff --git a/arch/powerpc/boot/cpm-serial.c b/arch/powerpc/boot/cpm-serial.c new file mode 100644 index 000000000000..fcb8b5e956bd --- /dev/null +++ b/arch/powerpc/boot/cpm-serial.c @@ -0,0 +1,249 @@ +/* + * CPM serial console support. + * + * Copyright 2007 Freescale Semiconductor, Inc. + * Author: Scott Wood + * + * 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; +} -- cgit v1.2.3