mpc512x: add multi serial PSC support

Extend mpc512x serial driver to support multiple PSC ports.

Subsequent patches for PDM360NG board support make use of this
functionality by defining CONFIG_SERIAL_MULTI in the board config
file. Additionally the used PSC devices are specified by defining
e.g. CONFIG_SYS_PSC1, CONFIG_SYS_PSC4 and CONFIG_SYS_PSC6.

Support for PSC devices other than 1, 3, 4 and 6 is not added
by this patch because these aren't used currently. In the future
it can be easily added using DECLARE_PSC_SERIAL_FUNCTIONS(N) and
INIT_PSC_SERIAL_STRUCTURE(N) macros in cpu/mpc512x/serial.c.
Additionally you have to add code for registering added
devices in serial_initialize() in common/serial.c.

Signed-off-by: Anatolij Gustschin <agust@denx.de>

1 files changed, 238 insertions, 28 deletions

diff --git a/arch/powerpc/cpu/mpc512x/serial.c b/arch/powerpc/cpu/mpc512x/serial.c
index ec2f41b..f421968 100644
--- a/arch/powerpc/cpu/mpc512x/serial.c
+++ b/arch/powerpc/cpu/mpc512x/serial.c
@@ -32,14 +32,16 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/processor.h>
+#include <serial.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#if defined(CONFIG_PSC_CONSOLE)
+#if defined(CONFIG_PSC_CONSOLE) || defined(CONFIG_SERIAL_MULTI)
 
 static void fifo_init (volatile psc512x_t *psc)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
+	u32 tfsize, rfsize;
 
 	/* reset Rx & Tx fifo slice */
 	out_be32(&psc->rfcmd, PSC_FIFO_RESET_SLICE);
@@ -49,8 +51,65 @@ static void fifo_init (volatile psc512x_t *psc)
 	out_be32(&psc->rfintmask, 0);
 	out_be32(&psc->tfintmask, 0);
 
-	out_be32(&psc->tfsize, CONSOLE_FIFO_TX_SIZE | (CONSOLE_FIFO_TX_ADDR << 16));
-	out_be32(&psc->rfsize, CONSOLE_FIFO_RX_SIZE | (CONSOLE_FIFO_RX_ADDR << 16));
+#if defined(CONFIG_SERIAL_MULTI)
+	switch (((u32)psc & 0xf00) >> 8) {
+	case 0:
+		tfsize = FIFOC_PSC0_TX_SIZE | (FIFOC_PSC0_TX_ADDR << 16);
+		rfsize = FIFOC_PSC0_RX_SIZE | (FIFOC_PSC0_RX_ADDR << 16);
+		break;
+	case 1:
+		tfsize = FIFOC_PSC1_TX_SIZE | (FIFOC_PSC1_TX_ADDR << 16);
+		rfsize = FIFOC_PSC1_RX_SIZE | (FIFOC_PSC1_RX_ADDR << 16);
+		break;
+	case 2:
+		tfsize = FIFOC_PSC2_TX_SIZE | (FIFOC_PSC2_TX_ADDR << 16);
+		rfsize = FIFOC_PSC2_RX_SIZE | (FIFOC_PSC2_RX_ADDR << 16);
+		break;
+	case 3:
+		tfsize = FIFOC_PSC3_TX_SIZE | (FIFOC_PSC3_TX_ADDR << 16);
+		rfsize = FIFOC_PSC3_RX_SIZE | (FIFOC_PSC3_RX_ADDR << 16);
+		break;
+	case 4:
+		tfsize = FIFOC_PSC4_TX_SIZE | (FIFOC_PSC4_TX_ADDR << 16);
+		rfsize = FIFOC_PSC4_RX_SIZE | (FIFOC_PSC4_RX_ADDR << 16);
+		break;
+	case 5:
+		tfsize = FIFOC_PSC5_TX_SIZE | (FIFOC_PSC5_TX_ADDR << 16);
+		rfsize = FIFOC_PSC5_RX_SIZE | (FIFOC_PSC5_RX_ADDR << 16);
+		break;
+	case 6:
+		tfsize = FIFOC_PSC6_TX_SIZE | (FIFOC_PSC6_TX_ADDR << 16);
+		rfsize = FIFOC_PSC6_RX_SIZE | (FIFOC_PSC6_RX_ADDR << 16);
+		break;
+	case 7:
+		tfsize = FIFOC_PSC7_TX_SIZE | (FIFOC_PSC7_TX_ADDR << 16);
+		rfsize = FIFOC_PSC7_RX_SIZE | (FIFOC_PSC7_RX_ADDR << 16);
+		break;
+	case 8:
+		tfsize = FIFOC_PSC8_TX_SIZE | (FIFOC_PSC8_TX_ADDR << 16);
+		rfsize = FIFOC_PSC8_RX_SIZE | (FIFOC_PSC8_RX_ADDR << 16);
+		break;
+	case 9:
+		tfsize = FIFOC_PSC9_TX_SIZE | (FIFOC_PSC9_TX_ADDR << 16);
+		rfsize = FIFOC_PSC9_RX_SIZE | (FIFOC_PSC9_RX_ADDR << 16);
+		break;
+	case 10:
+		tfsize = FIFOC_PSC10_TX_SIZE | (FIFOC_PSC10_TX_ADDR << 16);
+		rfsize = FIFOC_PSC10_RX_SIZE | (FIFOC_PSC10_RX_ADDR << 16);
+		break;
+	case 11:
+		tfsize = FIFOC_PSC11_TX_SIZE | (FIFOC_PSC11_TX_ADDR << 16);
+		rfsize = FIFOC_PSC11_RX_SIZE | (FIFOC_PSC11_RX_ADDR << 16);
+		break;
+	default:
+		return;
+	}
+#else
+	tfsize = CONSOLE_FIFO_TX_SIZE | (CONSOLE_FIFO_TX_ADDR << 16);
+	rfsize = CONSOLE_FIFO_RX_SIZE | (CONSOLE_FIFO_RX_ADDR << 16);
+#endif
+	out_be32(&psc->tfsize, tfsize);
+	out_be32(&psc->rfsize, rfsize);
 
 	/* enable Tx & Rx FIFO slice */
 	out_be32(&psc->rfcmd, PSC_FIFO_ENABLE_SLICE);
@@ -60,24 +119,47 @@ static void fifo_init (volatile psc512x_t *psc)
 	__asm__ volatile ("sync");
 }
 
-void serial_setbrg(void)
+void serial_setbrg_dev(unsigned int idx)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 	unsigned long baseclk, div;
+	unsigned long baudrate;
+	char buf[16];
+	char *br_env;
+
+	baudrate = gd->baudrate;
+	if (idx != CONFIG_PSC_CONSOLE) {
+		/* Allows setting baudrate for other serial devices
+		 * on PSCx using environment. If not specified, use
+		 * the same baudrate as for console.
+		 */
+		sprintf(buf, "psc%d_baudrate", idx);
+		br_env = getenv(buf);
+		if (br_env)
+			baudrate = simple_strtoul(br_env, NULL, 10);
+
+		debug("%s: idx %d, baudrate %d\n", __func__, idx, baudrate);
+	}
 
-	/* calculate dividor for setting PSC CTUR and CTLR registers */
+	/* calculate divisor for setting PSC CTUR and CTLR registers */
 	baseclk = (gd->ips_clk + 8) / 16;
-	div = (baseclk + (gd->baudrate / 2)) / gd->baudrate;
+	div = (baseclk + (baudrate / 2)) / baudrate;
 
 	out_8(&psc->ctur, (div >> 8) & 0xff);
 	out_8(&psc->ctlr,  div & 0xff); /* set baudrate */
 }
 
-int serial_init(void)
+int serial_init_dev(unsigned int idx)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
+#if defined(CONFIG_SERIAL_MULTI)
+	u32 reg;
+
+	reg = in_be32(&im->clk.sccr[0]);
+	out_be32(&im->clk.sccr[0], reg | CLOCK_SCCR1_PSC_EN(idx));
+#endif
 
 	fifo_init (psc);
 
@@ -100,7 +182,7 @@ int serial_init(void)
 	out_8(&psc->mode, PSC_MODE_1_STOPBIT);
 
 	/* set baudrate */
-	serial_setbrg();
+	serial_setbrg_dev(idx);
 
 	/* disable all interrupts */
 	out_be16(&psc->psc_imr, 0);
@@ -113,13 +195,27 @@ int serial_init(void)
 	return 0;
 }
 
-void serial_putc (const char c)
+int serial_uninit_dev(unsigned int idx)
+{
+	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
+	u32 reg;
+
+	out_8(&psc->command, PSC_RX_DISABLE | PSC_TX_DISABLE);
+	reg = in_be32(&im->clk.sccr[0]);
+	reg &= ~CLOCK_SCCR1_PSC_EN(idx);
+	out_be32(&im->clk.sccr[0], reg);
+
+	return 0;
+}
+
+void serial_putc_dev(unsigned int idx, const char c)
 {
 	volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 
 	if (c == '\n')
-		serial_putc ('\r');
+		serial_putc_dev(idx, '\r');
 
 	/* Wait for last character to go. */
 	while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
@@ -128,10 +224,10 @@ void serial_putc (const char c)
 	out_8(&psc->tfdata_8, c);
 }
 
-void serial_putc_raw (const char c)
+void serial_putc_raw_dev(unsigned int idx, const char c)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 
 	/* Wait for last character to go. */
 	while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
@@ -140,18 +236,16 @@ void serial_putc_raw (const char c)
 	out_8(&psc->tfdata_8, c);
 }
 
-
-void serial_puts (const char *s)
+void serial_puts_dev(unsigned int idx, const char *s)
 {
-	while (*s) {
-		serial_putc (*s++);
-	}
+	while (*s)
+		serial_putc_dev(idx, *s++);
 }
 
-int serial_getc (void)
+int serial_getc_dev(unsigned int idx)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 
 	/* Wait for a character to arrive. */
 	while (in_be32(&psc->rfstat) & PSC_FIFO_EMPTY)
@@ -160,18 +254,18 @@ int serial_getc (void)
 	return in_8(&psc->rfdata_8);
 }
 
-int serial_tstc (void)
+int serial_tstc_dev(unsigned int idx)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 
 	return !(in_be32(&psc->rfstat) & PSC_FIFO_EMPTY);
 }
 
-void serial_setrts(int s)
+void serial_setrts_dev(unsigned int idx, int s)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 
 	if (s) {
 		/* Assert RTS (become LOW) */
@@ -183,11 +277,127 @@ void serial_setrts(int s)
 	}
 }
 
-int serial_getcts(void)
+int serial_getcts_dev(unsigned int idx)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
-	volatile psc512x_t *psc = (psc512x_t *) &im->psc[CONFIG_PSC_CONSOLE];
+	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
 
 	return (in_8(&psc->ip) & 0x1) ? 0 : 1;
 }
+#endif /* CONFIG_PSC_CONSOLE || CONFIG_SERIAL_MULTI */
+
+#if defined(CONFIG_SERIAL_MULTI)
+
+#define DECLARE_PSC_SERIAL_FUNCTIONS(port) \
+	int serial##port##_init(void) \
+	{ \
+		return serial_init_dev(port); \
+	} \
+	int serial##port##_uninit(void) \
+	{ \
+		return serial_uninit_dev(port); \
+	} \
+	void serial##port##_setbrg(void) \
+	{ \
+		serial_setbrg_dev(port); \
+	} \
+	int serial##port##_getc(void) \
+	{ \
+		return serial_getc_dev(port); \
+	} \
+	int serial##port##_tstc(void) \
+	{ \
+		return serial_tstc_dev(port); \
+	} \
+	void serial##port##_putc(const char c) \
+	{ \
+		serial_putc_dev(port, c); \
+	} \
+	void serial##port##_puts(const char *s) \
+	{ \
+		serial_puts_dev(port, s); \
+	}
+
+#define INIT_PSC_SERIAL_STRUCTURE(port, name, bus) { \
+	name, \
+	bus, \
+	serial##port##_init, \
+	serial##port##_uninit, \
+	serial##port##_setbrg, \
+	serial##port##_getc, \
+	serial##port##_tstc, \
+	serial##port##_putc, \
+	serial##port##_puts, \
+}
+
+#if defined(CONFIG_SYS_PSC1)
+DECLARE_PSC_SERIAL_FUNCTIONS(1);
+struct serial_device serial1_device =
+INIT_PSC_SERIAL_STRUCTURE(1, "psc1", "UART1");
+#endif
+
+#if defined(CONFIG_SYS_PSC3)
+DECLARE_PSC_SERIAL_FUNCTIONS(3);
+struct serial_device serial3_device =
+INIT_PSC_SERIAL_STRUCTURE(3, "psc3", "UART3");
+#endif
+
+#if defined(CONFIG_SYS_PSC4)
+DECLARE_PSC_SERIAL_FUNCTIONS(4);
+struct serial_device serial4_device =
+INIT_PSC_SERIAL_STRUCTURE(4, "psc4", "UART4");
+#endif
+
+#if defined(CONFIG_SYS_PSC6)
+DECLARE_PSC_SERIAL_FUNCTIONS(6);
+struct serial_device serial6_device =
+INIT_PSC_SERIAL_STRUCTURE(6, "psc6", "UART6");
+#endif
+
+#else
+
+void serial_setbrg(void)
+{
+	serial_setbrg_dev(CONFIG_PSC_CONSOLE);
+}
+
+int serial_init(void)
+{
+	return serial_init_dev(CONFIG_PSC_CONSOLE);
+}
+
+void serial_putc(const char c)
+{
+	serial_putc_dev(CONFIG_PSC_CONSOLE, c);
+}
+
+void serial_putc_raw(const char c)
+{
+	serial_putc_raw_dev(CONFIG_PSC_CONSOLE, c);
+}
+
+void serial_puts(const char *s)
+{
+	serial_puts_dev(CONFIG_PSC_CONSOLE, s);
+}
+
+int serial_getc(void)
+{
+	return serial_getc_dev(CONFIG_PSC_CONSOLE);
+}
+
+int serial_tstc(void)
+{
+	return serial_tstc_dev(CONFIG_PSC_CONSOLE);
+}
+
+void serial_setrts(int s)
+{
+	return serial_setrts_dev(CONFIG_PSC_CONSOLE, s);
+}
+
+int serial_getcts(void)
+{
+	return serial_getcts_dev(CONFIG_PSC_CONSOLE);
+}
 #endif /* CONFIG_PSC_CONSOLE */