153 lines
3.0 KiB
C
153 lines
3.0 KiB
C
/*
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* udbg serial input/output routines for the Marvell MV64x60 (Discovery).
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*
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* Author: Dale Farnsworth <dale@farnsworth.org>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/udbg.h>
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#include <sysdev/mv64x60.h>
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#define MPSC_0_CR1_OFFSET 0x000c
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#define MPSC_0_CR2_OFFSET 0x0010
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#define MPSC_CHR_2_TCS (1 << 9)
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#define MPSC_0_CHR_10_OFFSET 0x0030
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#define MPSC_INTR_CAUSE_OFF_0 0x0004
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#define MPSC_INTR_CAUSE_OFF_1 0x000c
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#define MPSC_INTR_CAUSE_RCC (1<<6)
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static void __iomem *mpsc_base;
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static void __iomem *mpsc_intr_cause;
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static void mv64x60_udbg_putc(char c)
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{
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if (c == '\n')
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mv64x60_udbg_putc('\r');
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while(in_le32(mpsc_base + MPSC_0_CR2_OFFSET) & MPSC_CHR_2_TCS)
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;
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out_le32(mpsc_base + MPSC_0_CR1_OFFSET, c);
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out_le32(mpsc_base + MPSC_0_CR2_OFFSET, MPSC_CHR_2_TCS);
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}
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static int mv64x60_udbg_testc(void)
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{
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return (in_le32(mpsc_intr_cause) & MPSC_INTR_CAUSE_RCC) != 0;
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}
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static int mv64x60_udbg_getc(void)
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{
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int cause = 0;
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int c;
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while (!mv64x60_udbg_testc())
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;
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c = in_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2);
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out_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2, c);
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out_le32(mpsc_intr_cause, cause & ~MPSC_INTR_CAUSE_RCC);
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return c;
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}
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static int mv64x60_udbg_getc_poll(void)
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{
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if (!mv64x60_udbg_testc())
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return -1;
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return mv64x60_udbg_getc();
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}
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static void mv64x60_udbg_init(void)
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{
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struct device_node *np, *mpscintr, *stdout = NULL;
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const char *path;
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const phandle *ph;
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struct resource r[2];
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const int *block_index;
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int intr_cause_offset;
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int err;
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path = of_get_property(of_chosen, "linux,stdout-path", NULL);
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if (!path)
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return;
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stdout = of_find_node_by_path(path);
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if (!stdout)
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return;
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for_each_compatible_node(np, NULL, "marvell,mv64360-mpsc") {
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if (np == stdout)
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break;
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}
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of_node_put(stdout);
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if (!np)
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return;
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block_index = of_get_property(np, "cell-index", NULL);
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if (!block_index)
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goto error;
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switch (*block_index) {
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case 0:
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intr_cause_offset = MPSC_INTR_CAUSE_OFF_0;
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break;
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case 1:
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intr_cause_offset = MPSC_INTR_CAUSE_OFF_1;
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break;
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default:
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goto error;
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}
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err = of_address_to_resource(np, 0, &r[0]);
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if (err)
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goto error;
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ph = of_get_property(np, "mpscintr", NULL);
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mpscintr = of_find_node_by_phandle(*ph);
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if (!mpscintr)
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goto error;
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err = of_address_to_resource(mpscintr, 0, &r[1]);
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of_node_put(mpscintr);
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if (err)
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goto error;
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of_node_put(np);
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mpsc_base = ioremap(r[0].start, resource_size(&r[0]));
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if (!mpsc_base)
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return;
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mpsc_intr_cause = ioremap(r[1].start, resource_size(&r[1]));
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if (!mpsc_intr_cause) {
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iounmap(mpsc_base);
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return;
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}
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mpsc_intr_cause += intr_cause_offset;
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udbg_putc = mv64x60_udbg_putc;
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udbg_getc = mv64x60_udbg_getc;
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udbg_getc_poll = mv64x60_udbg_getc_poll;
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return;
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error:
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of_node_put(np);
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}
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void mv64x60_init_early(void)
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{
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mv64x60_udbg_init();
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}
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