summaryrefslogtreecommitdiff
path: root/post/cpu/ppc4xx/uart.c
diff options
context:
space:
mode:
Diffstat (limited to 'post/cpu/ppc4xx/uart.c')
-rw-r--r--post/cpu/ppc4xx/uart.c302
1 files changed, 22 insertions, 280 deletions
diff --git a/post/cpu/ppc4xx/uart.c b/post/cpu/ppc4xx/uart.c
index 6b61cc191e..d76895696b 100644
--- a/post/cpu/ppc4xx/uart.c
+++ b/post/cpu/ppc4xx/uart.c
@@ -26,9 +26,10 @@
*/
#include <common.h>
-#include <ppc4xx.h>
+#include <asm/ppc4xx.h>
#include <ns16550.h>
#include <asm/io.h>
+#include <serial.h>
/*
* UART test
@@ -46,299 +47,40 @@
* be overridden in the board config file
*/
#ifndef CONFIG_SYS_POST_UART_TABLE
-#define CONFIG_SYS_POST_UART_TABLE {UART0_BASE, UART1_BASE, UART2_BASE, UART3_BASE}
-#endif
-
-#include <asm/processor.h>
-#include <serial.h>
-
-#if defined(CONFIG_440)
-#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
- defined(CONFIG_440EPX) || defined(CONFIG_440GRX)
-#define UART0_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000300
-#define UART1_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000400
-#define UART2_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000500
-#define UART3_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000600
-#else
-#define UART0_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000200
-#define UART1_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000300
-#endif
-
-#if defined(CONFIG_440SP) || defined(CONFIG_440SPE)
-#define UART2_BASE CONFIG_SYS_PERIPHERAL_BASE + 0x00000600
-#endif
-
-#if defined(CONFIG_440GP)
-#define CR0_MASK 0x3fff0000
-#define CR0_EXTCLK_ENA 0x00600000
-#define CR0_UDIV_POS 16
-#define UDIV_SUBTRACT 1
-#define UART0_SDR CPC0_CR0
-#define MFREG(a, d) d = mfdcr(a)
-#define MTREG(a, d) mtdcr(a, d)
-#else /* #if defined(CONFIG_440GP) */
-/* all other 440 PPC's access clock divider via sdr register */
-#define CR0_MASK 0xdfffffff
-#define CR0_EXTCLK_ENA 0x00800000
-#define CR0_UDIV_POS 0
-#define UDIV_SUBTRACT 0
-#define UART0_SDR SDR0_UART0
-#define UART1_SDR SDR0_UART1
-#if defined(CONFIG_440EP) || defined(CONFIG_440EPX) || \
- defined(CONFIG_440GR) || defined(CONFIG_440GRX) || \
- defined(CONFIG_440SP) || defined(CONFIG_440SPE)
-#define UART2_SDR SDR0_UART2
-#endif
-#if defined(CONFIG_440EP) || defined(CONFIG_440EPX) || \
- defined(CONFIG_440GR) || defined(CONFIG_440GRX)
-#define UART3_SDR SDR0_UART3
-#endif
-#define MFREG(a, d) mfsdr(a, d)
-#define MTREG(a, d) mtsdr(a, d)
-#endif /* #if defined(CONFIG_440GP) */
-#elif defined(CONFIG_405EP) || defined(CONFIG_405EZ)
-#define UART0_BASE 0xef600300
-#define UART1_BASE 0xef600400
-#define UCR0_MASK 0x0000007f
-#define UCR1_MASK 0x00007f00
-#define UCR0_UDIV_POS 0
-#define UCR1_UDIV_POS 8
-#define UDIV_MAX 127
-#elif defined(CONFIG_405EX)
-#define UART0_BASE 0xef600200
-#define UART1_BASE 0xef600300
-#define CR0_MASK 0x000000ff
-#define CR0_EXTCLK_ENA 0x00800000
-#define CR0_UDIV_POS 0
-#define UDIV_SUBTRACT 0
-#define UART0_SDR SDR0_UART0
-#define UART1_SDR SDR0_UART1
-#define MFREG(a, d) mfsdr(a, d)
-#define MTREG(a, d) mtsdr(a, d)
-#else /* CONFIG_405GP || CONFIG_405CR */
-#define UART0_BASE 0xef600300
-#define UART1_BASE 0xef600400
-#define CR0_MASK 0x00001fff
-#define CR0_EXTCLK_ENA 0x000000c0
-#define CR0_UDIV_POS 1
-#define UDIV_MAX 32
+#define CONFIG_SYS_POST_UART_TABLE { CONFIG_SYS_NS16550_COM1, \
+ CONFIG_SYS_NS16550_COM2, CONFIG_SYS_NS16550_COM3, \
+ CONFIG_SYS_NS16550_COM4 }
#endif
DECLARE_GLOBAL_DATA_PTR;
-static void uart_post_init_common(struct NS16550 *com_port, unsigned short bdiv)
-{
- volatile char val;
-
- out_8(&com_port->lcr, 0x80); /* set DLAB bit */
- out_8(&com_port->dll, bdiv); /* set baudrate divisor */
- out_8(&com_port->dlm, bdiv >> 8); /* set baudrate divisor */
- out_8(&com_port->lcr, 0x03); /* clear DLAB; set 8 bits, no parity */
- out_8(&com_port->fcr, 0x00); /* disable FIFO */
- out_8(&com_port->mcr, 0x10); /* enable loopback mode */
- val = in_8(&com_port->lsr); /* clear line status */
- val = in_8(&com_port->rbr); /* read receive buffer */
- out_8(&com_port->scr, 0x00); /* set scratchpad */
- out_8(&com_port->ier, 0x00); /* set interrupt enable reg */
-}
-
-#if defined(CONFIG_440) || defined(CONFIG_405EX)
-#if !defined(CONFIG_SYS_EXT_SERIAL_CLOCK)
-static void serial_divs (int baudrate, unsigned long *pudiv,
- unsigned short *pbdiv)
-{
- sys_info_t sysinfo;
- unsigned long div; /* total divisor udiv * bdiv */
- unsigned long umin; /* minimum udiv */
- unsigned short diff; /* smallest diff */
- unsigned long udiv; /* best udiv */
- unsigned short idiff; /* current diff */
- unsigned short ibdiv; /* current bdiv */
- unsigned long i;
- unsigned long est; /* current estimate */
-
- get_sys_info(&sysinfo);
-
- udiv = 32; /* Assume lowest possible serial clk */
- div = sysinfo.freqPLB / (16 * baudrate); /* total divisor */
- umin = sysinfo.pllOpbDiv << 1; /* 2 x OPB divisor */
- diff = 32; /* highest possible */
-
- /* i is the test udiv value -- start with the largest
- * possible (32) to minimize serial clock and constrain
- * search to umin.
- */
- for (i = 32; i > umin; i--) {
- ibdiv = div / i;
- est = i * ibdiv;
- idiff = (est > div) ? (est-div) : (div-est);
- if (idiff == 0) {
- udiv = i;
- break; /* can't do better */
- } else if (idiff < diff) {
- udiv = i; /* best so far */
- diff = idiff; /* update lowest diff*/
- }
- }
-
- *pudiv = udiv;
- *pbdiv = div / udiv;
-}
-#endif
-
-static int uart_post_init (struct NS16550 *com_port)
+static int test_ctlr (struct NS16550 *com_port, int index)
{
- unsigned long reg = 0;
- unsigned long udiv;
- unsigned short bdiv;
-#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
- unsigned long tmp;
-#endif
+ int res = -1;
+ char test_str[] = "*** UART Test String ***\r\n";
int i;
+ int divisor;
- for (i = 0; i < 3500; i++) {
- if (in_8(&com_port->lsr) & UART_LSR_THRE)
- break;
- udelay (100);
- }
- MFREG(UART0_SDR, reg);
- reg &= ~CR0_MASK;
-
-#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
- reg |= CR0_EXTCLK_ENA;
- udiv = 1;
- tmp = gd->baudrate * 16;
- bdiv = (CONFIG_SYS_EXT_SERIAL_CLOCK + tmp / 2) / tmp;
-#else
- /* For 440, the cpu clock is on divider chain A, UART on divider
- * chain B ... so cpu clock is irrelevant. Get the "optimized"
- * values that are subject to the 1/2 opb clock constraint
- */
- serial_divs (gd->baudrate, &udiv, &bdiv);
-#endif
-
- reg |= (udiv - UDIV_SUBTRACT) << CR0_UDIV_POS; /* set the UART divisor */
+ divisor = (get_serial_clock() + (gd->baudrate * (16 / 2))) /
+ (16 * gd->baudrate);
+ NS16550_init(com_port, divisor);
/*
- * Configure input clock to baudrate generator for all
- * available serial ports here
+ * Set internal loopback mode in UART
*/
- MTREG(UART0_SDR, reg);
-#if defined(UART1_SDR)
- MTREG(UART1_SDR, reg);
-#endif
-#if defined(UART2_SDR)
- MTREG(UART2_SDR, reg);
-#endif
-#if defined(UART3_SDR)
- MTREG(UART3_SDR, reg);
-#endif
-
- uart_post_init_common(com_port, bdiv);
-
- return 0;
-}
-
-#else /* CONFIG_440 */
-
-static int uart_post_init (struct NS16550 *com_port)
-{
- unsigned long reg;
- unsigned long tmp;
- unsigned long clk;
- unsigned long udiv;
- unsigned short bdiv;
- int i;
-
- for (i = 0; i < 3500; i++) {
- if (in_8(&com_port->lsr) & UART_LSR_THRE)
- break;
- udelay (100);
- }
-
-#if defined(CONFIG_405EZ)
- serial_divs(gd->baudrate, &udiv, &bdiv);
- clk = tmp = reg = 0;
-#else
-#ifdef CONFIG_405EP
- reg = mfdcr(CPC0_UCR) & ~(UCR0_MASK | UCR1_MASK);
- clk = gd->cpu_clk;
- tmp = CONFIG_SYS_BASE_BAUD * 16;
- udiv = (clk + tmp / 2) / tmp;
- if (udiv > UDIV_MAX) /* max. n bits for udiv */
- udiv = UDIV_MAX;
- reg |= (udiv) << UCR0_UDIV_POS; /* set the UART divisor */
- reg |= (udiv) << UCR1_UDIV_POS; /* set the UART divisor */
- mtdcr (CPC0_UCR, reg);
-#else /* CONFIG_405EP */
- reg = mfdcr(CPC0_CR0) & ~CR0_MASK;
-#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
- clk = CONFIG_SYS_EXT_SERIAL_CLOCK;
- udiv = 1;
- reg |= CR0_EXTCLK_ENA;
-#else
- clk = gd->cpu_clk;
-#ifdef CONFIG_SYS_405_UART_ERRATA_59
- udiv = 31; /* Errata 59: stuck at 31 */
-#else
- tmp = CONFIG_SYS_BASE_BAUD * 16;
- udiv = (clk + tmp / 2) / tmp;
- if (udiv > UDIV_MAX) /* max. n bits for udiv */
- udiv = UDIV_MAX;
-#endif
-#endif
- reg |= (udiv - 1) << CR0_UDIV_POS; /* set the UART divisor */
- mtdcr (CPC0_CR0, reg);
-#endif /* CONFIG_405EP */
- tmp = gd->baudrate * udiv * 16;
- bdiv = (clk + tmp / 2) / tmp;
-#endif /* CONFIG_405EZ */
-
- uart_post_init_common(com_port, bdiv);
+ out_8(&com_port->mcr, in_8(&com_port->mcr) | UART_MCR_LOOP);
- return 0;
-}
-#endif /* CONFIG_440 */
-
-static void uart_post_putc (struct NS16550 *com_port, char c)
-{
- int i;
-
- out_8(&com_port->thr, c); /* put character out */
-
- /* Wait for transfer completion */
- for (i = 0; i < 3500; i++) {
- if (in_8(&com_port->lsr) & UART_LSR_THRE)
- break;
- udelay (100);
- }
-}
-
-static int uart_post_getc (struct NS16550 *com_port)
-{
- int i;
-
- /* Wait for character available */
- for (i = 0; i < 3500; i++) {
- if (in_8(&com_port->lsr) & UART_LSR_DR)
- break;
- udelay (100);
- }
-
- return 0xff & in_8(&com_port->rbr);
-}
-
-static int test_ctlr (struct NS16550 *com_port, int index)
-{
- int res = -1;
- char test_str[] = "*** UART Test String ***\r\n";
- int i;
+ /* Reset FIFOs */
+ out_8(&com_port->fcr, UART_FCR_RXSR | UART_FCR_TXSR);
+ udelay(100);
- uart_post_init (com_port);
+ /* Flush RX-FIFO */
+ while (NS16550_tstc(com_port))
+ NS16550_getc(com_port);
for (i = 0; i < sizeof (test_str) - 1; i++) {
- uart_post_putc (com_port, test_str[i]);
- if (uart_post_getc (com_port) != test_str[i])
+ NS16550_putc(com_port, test_str[i]);
+ if (NS16550_getc(com_port) != test_str[i])
goto done;
}
res = 0;
generated by cgit (git 2.34.1) at 2024-12-23 04:45:00 +0000