b45d527974
This is a driver for the SB1250 DUART, a dual serial port implementation included in the Broadcom family of SOCs descending from the SiByte SB1250 MIPS64 chip multiprocessor. It is a new implementation replacing the old-fashioned driver currently present in the linux-mips.org tree. It supports all the usual features one would expect from a(n asynchronous) serial driver, including modem line control (as far as hardware supports it -- there is edge detection logic missing from the DCD and RI lines and the driver does not implement polling of these lines at the moment), the serial console, BREAK transmission and reception, including the magic SysRq. The receive FIFO threshold is not maintained though. The driver was tested with a SWARM board which uses a BCM1250 SOC (which is dual MIPS64 CMP) and has both ports of the single DUART implemented wired externally. Both were tested. Testing included using the ports as terminal lines at 1200bps (which is the ports minimum), 115200bps and a couple of random speeds inbetween. The modem lines were verified to operate correctly. No testing was performed with a use as a network interface, like with SLIP or PPP. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
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* Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/string.h>
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#include <asm/bootinfo.h>
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#include <asm/mipsregs.h>
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#include <asm/io.h>
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#include <asm/sibyte/sb1250.h>
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#include <asm/sibyte/bcm1480_regs.h>
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#include <asm/sibyte/bcm1480_scd.h>
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#include <asm/sibyte/sb1250_scd.h>
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unsigned int sb1_pass;
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unsigned int soc_pass;
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unsigned int soc_type;
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EXPORT_SYMBOL(soc_type);
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unsigned int periph_rev;
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unsigned int zbbus_mhz;
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static unsigned int part_type;
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static char *soc_str;
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static char *pass_str;
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static inline int setup_bcm1x80_bcm1x55(void);
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/* Setup code likely to be common to all SiByte platforms */
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static inline int sys_rev_decode(void)
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{
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int ret = 0;
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switch (soc_type) {
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case K_SYS_SOC_TYPE_BCM1x80:
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if (part_type == K_SYS_PART_BCM1480)
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soc_str = "BCM1480";
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else if (part_type == K_SYS_PART_BCM1280)
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soc_str = "BCM1280";
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else
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soc_str = "BCM1x80";
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ret = setup_bcm1x80_bcm1x55();
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break;
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case K_SYS_SOC_TYPE_BCM1x55:
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if (part_type == K_SYS_PART_BCM1455)
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soc_str = "BCM1455";
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else if (part_type == K_SYS_PART_BCM1255)
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soc_str = "BCM1255";
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else
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soc_str = "BCM1x55";
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ret = setup_bcm1x80_bcm1x55();
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break;
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default:
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printk("Unknown part type %x\n", part_type);
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ret = 1;
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break;
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}
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return ret;
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}
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static inline int setup_bcm1x80_bcm1x55(void)
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{
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int ret = 0;
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switch (soc_pass) {
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case K_SYS_REVISION_BCM1480_S0:
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periph_rev = 1;
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pass_str = "S0 (pass1)";
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break;
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case K_SYS_REVISION_BCM1480_A1:
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periph_rev = 1;
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pass_str = "A1 (pass1)";
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break;
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case K_SYS_REVISION_BCM1480_A2:
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periph_rev = 1;
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pass_str = "A2 (pass1)";
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break;
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case K_SYS_REVISION_BCM1480_A3:
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periph_rev = 1;
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pass_str = "A3 (pass1)";
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break;
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case K_SYS_REVISION_BCM1480_B0:
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periph_rev = 1;
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pass_str = "B0 (pass2)";
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break;
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default:
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printk("Unknown %s rev %x\n", soc_str, soc_pass);
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periph_rev = 1;
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pass_str = "Unknown Revision";
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break;
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}
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return ret;
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}
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void bcm1480_setup(void)
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{
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uint64_t sys_rev;
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int plldiv;
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sb1_pass = read_c0_prid() & 0xff;
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sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
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soc_type = SYS_SOC_TYPE(sys_rev);
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part_type = G_SYS_PART(sys_rev);
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soc_pass = G_SYS_REVISION(sys_rev);
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if (sys_rev_decode()) {
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printk("Restart after failure to identify SiByte chip\n");
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machine_restart(NULL);
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}
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plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
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zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
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printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
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soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
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printk("Board type: %s\n", get_system_type());
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}
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