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Diffstat (limited to 'arch/powerpc/boot/cpm-serial.c')
-rw-r--r--arch/powerpc/boot/cpm-serial.c89
1 files changed, 68 insertions, 21 deletions
diff --git a/arch/powerpc/boot/cpm-serial.c b/arch/powerpc/boot/cpm-serial.c
index 1f6225aad29..19dc15abe43 100644
--- a/arch/powerpc/boot/cpm-serial.c
+++ b/arch/powerpc/boot/cpm-serial.c
@@ -11,6 +11,7 @@
#include "types.h"
#include "io.h"
#include "ops.h"
+#include "page.h"
struct cpm_scc {
u32 gsmrl;
@@ -42,6 +43,22 @@ struct cpm_param {
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 {
@@ -54,10 +71,10 @@ static void *cpcr;
static struct cpm_param *param;
static struct cpm_smc *smc;
static struct cpm_scc *scc;
-struct cpm_bd *tbdf, *rbdf;
+static struct cpm_bd *tbdf, *rbdf;
static u32 cpm_cmd;
-static u8 *muram_start;
-static u32 muram_offset;
+static void *cbd_addr;
+static u32 cbd_offset;
static void (*do_cmd)(int op);
static void (*enable_port)(void);
@@ -119,20 +136,25 @@ static int cpm_serial_open(void)
out_8(&param->rfcr, 0x10);
out_8(&param->tfcr, 0x10);
-
- rbdf = (struct cpm_bd *)muram_start;
- rbdf->addr = (u8 *)(rbdf + 2);
+ out_be16(&param->mrblr, 1);
+ out_be16(&param->maxidl, 0);
+ out_be16(&param->brkec, 0);
+ out_be16(&param->brkln, 0);
+ out_be16(&param->brkcr, 0);
+
+ rbdf = cbd_addr;
+ rbdf->addr = (u8 *)rbdf - 1;
rbdf->sc = 0xa000;
rbdf->len = 1;
tbdf = rbdf + 1;
- tbdf->addr = (u8 *)(rbdf + 2) + 1;
+ tbdf->addr = (u8 *)rbdf - 2;
tbdf->sc = 0x2000;
tbdf->len = 1;
sync();
- out_be16(&param->rbase, muram_offset);
- out_be16(&param->tbase, muram_offset + sizeof(struct cpm_bd));
+ out_be16(&param->rbase, cbd_offset);
+ out_be16(&param->tbase, cbd_offset + sizeof(struct cpm_bd));
do_cmd(CPM_CMD_INIT_RX_TX);
@@ -175,9 +197,12 @@ static unsigned char cpm_serial_getc(void)
int cpm_console_init(void *devp, struct serial_console_data *scdp)
{
- void *reg_virt[2];
- int is_smc = 0, is_cpm2 = 0, n;
+ 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;
@@ -201,19 +226,18 @@ int cpm_console_init(void *devp, struct serial_console_data *scdp)
else
do_cmd = cpm1_cmd;
- n = getprop(devp, "fsl,cpm-command", &cpm_cmd, 4);
- if (n < 4)
+ if (getprop(devp, "fsl,cpm-command", &cpm_cmd, 4) < 4)
return -1;
- if (dt_get_virtual_reg(devp, reg_virt, 2) < 2)
+ if (dt_get_virtual_reg(devp, vreg, 2) < 2)
return -1;
if (is_smc)
- smc = reg_virt[0];
+ smc = vreg[0];
else
- scc = reg_virt[0];
+ scc = vreg[0];
- param = reg_virt[1];
+ param = vreg[1];
parent = get_parent(devp);
if (!parent)
@@ -227,17 +251,40 @@ int cpm_console_init(void *devp, struct serial_console_data *scdp)
return -1;
/* For bootwrapper-compatible device trees, we assume that the first
- * entry has at least 18 bytes, and that #address-cells/#data-cells
+ * 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, (void **)&muram_start, 1) < 1)
+ if (dt_get_virtual_reg(muram, &muram_addr, 1) < 1)
return -1;
- n = getprop(muram, "reg", &muram_offset, 4);
- if (n < 4)
+ 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;