580 строки
16 KiB
C
580 строки
16 KiB
C
#include <linux/kernel.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_core.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <asm/io.h>
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#include <asm/mmu.h>
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#include <asm/prom.h>
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#include <asm/serial.h>
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#include <asm/udbg.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(fmt...) do { printk(fmt); } while(0)
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#else
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#define DBG(fmt...) do { } while(0)
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#endif
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#define MAX_LEGACY_SERIAL_PORTS 8
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static struct plat_serial8250_port
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legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
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static struct legacy_serial_info {
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struct device_node *np;
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unsigned int speed;
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unsigned int clock;
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int irq_check_parent;
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phys_addr_t taddr;
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} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
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static unsigned int legacy_serial_count;
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static int legacy_serial_console = -1;
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static int __init add_legacy_port(struct device_node *np, int want_index,
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int iotype, phys_addr_t base,
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phys_addr_t taddr, unsigned long irq,
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upf_t flags, int irq_check_parent)
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{
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u32 *clk, *spd, clock = BASE_BAUD * 16;
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int index;
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/* get clock freq. if present */
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clk = (u32 *)get_property(np, "clock-frequency", NULL);
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if (clk && *clk)
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clock = *clk;
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/* get default speed if present */
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spd = (u32 *)get_property(np, "current-speed", NULL);
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/* If we have a location index, then try to use it */
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if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
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index = want_index;
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else
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index = legacy_serial_count;
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/* if our index is still out of range, that mean that
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* array is full, we could scan for a free slot but that
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* make little sense to bother, just skip the port
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*/
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if (index >= MAX_LEGACY_SERIAL_PORTS)
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return -1;
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if (index >= legacy_serial_count)
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legacy_serial_count = index + 1;
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/* Check if there is a port who already claimed our slot */
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if (legacy_serial_infos[index].np != 0) {
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/* if we still have some room, move it, else override */
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if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
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printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
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index, legacy_serial_count);
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legacy_serial_ports[legacy_serial_count] =
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legacy_serial_ports[index];
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legacy_serial_infos[legacy_serial_count] =
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legacy_serial_infos[index];
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legacy_serial_count++;
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} else {
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printk(KERN_DEBUG "Replacing legacy port %d\n", index);
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}
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}
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/* Now fill the entry */
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memset(&legacy_serial_ports[index], 0,
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sizeof(struct plat_serial8250_port));
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if (iotype == UPIO_PORT)
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legacy_serial_ports[index].iobase = base;
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else
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legacy_serial_ports[index].mapbase = base;
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legacy_serial_ports[index].iotype = iotype;
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legacy_serial_ports[index].uartclk = clock;
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legacy_serial_ports[index].irq = irq;
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legacy_serial_ports[index].flags = flags;
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legacy_serial_infos[index].taddr = taddr;
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legacy_serial_infos[index].np = of_node_get(np);
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legacy_serial_infos[index].clock = clock;
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legacy_serial_infos[index].speed = spd ? *spd : 0;
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legacy_serial_infos[index].irq_check_parent = irq_check_parent;
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printk(KERN_DEBUG "Found legacy serial port %d for %s\n",
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index, np->full_name);
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printk(KERN_DEBUG " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
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(iotype == UPIO_PORT) ? "port" : "mem",
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(unsigned long long)base, (unsigned long long)taddr, irq,
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legacy_serial_ports[index].uartclk,
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legacy_serial_infos[index].speed);
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return index;
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}
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static int __init add_legacy_soc_port(struct device_node *np,
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struct device_node *soc_dev)
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{
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u64 addr;
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u32 *addrp;
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upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
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struct device_node *tsi = of_get_parent(np);
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/* We only support ports that have a clock frequency properly
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* encoded in the device-tree.
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*/
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if (get_property(np, "clock-frequency", NULL) == NULL)
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return -1;
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/* Get the address */
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addrp = of_get_address(soc_dev, 0, NULL, NULL);
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if (addrp == NULL)
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return -1;
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addr = of_translate_address(soc_dev, addrp);
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if (addr == OF_BAD_ADDR)
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return -1;
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/* Add port, irq will be dealt with later. We passed a translated
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* IO port value. It will be fixed up later along with the irq
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*/
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if (tsi && !strcmp(tsi->type, "tsi-bridge"))
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return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0);
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else
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return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0);
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}
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static int __init add_legacy_isa_port(struct device_node *np,
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struct device_node *isa_brg)
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{
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u32 *reg;
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char *typep;
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int index = -1;
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u64 taddr;
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DBG(" -> add_legacy_isa_port(%s)\n", np->full_name);
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/* Get the ISA port number */
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reg = (u32 *)get_property(np, "reg", NULL);
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if (reg == NULL)
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return -1;
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/* Verify it's an IO port, we don't support anything else */
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if (!(reg[0] & 0x00000001))
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return -1;
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/* Now look for an "ibm,aix-loc" property that gives us ordering
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* if any...
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*/
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typep = (char *)get_property(np, "ibm,aix-loc", NULL);
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/* If we have a location index, then use it */
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if (typep && *typep == 'S')
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index = simple_strtol(typep+1, NULL, 0) - 1;
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/* Translate ISA address. If it fails, we still register the port
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* with no translated address so that it can be picked up as an IO
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* port later by the serial driver
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*/
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taddr = of_translate_address(np, reg);
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if (taddr == OF_BAD_ADDR)
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taddr = 0;
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/* Add port, irq will be dealt with later */
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return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr,
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NO_IRQ, UPF_BOOT_AUTOCONF, 0);
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}
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#ifdef CONFIG_PCI
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static int __init add_legacy_pci_port(struct device_node *np,
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struct device_node *pci_dev)
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{
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u64 addr, base;
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u32 *addrp;
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unsigned int flags;
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int iotype, index = -1, lindex = 0;
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DBG(" -> add_legacy_pci_port(%s)\n", np->full_name);
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/* We only support ports that have a clock frequency properly
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* encoded in the device-tree (that is have an fcode). Anything
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* else can't be used that early and will be normally probed by
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* the generic 8250_pci driver later on. The reason is that 8250
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* compatible UARTs on PCI need all sort of quirks (port offsets
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* etc...) that this code doesn't know about
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*/
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if (get_property(np, "clock-frequency", NULL) == NULL)
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return -1;
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/* Get the PCI address. Assume BAR 0 */
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addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
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if (addrp == NULL)
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return -1;
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/* We only support BAR 0 for now */
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iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
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addr = of_translate_address(pci_dev, addrp);
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if (addr == OF_BAD_ADDR)
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return -1;
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/* Set the IO base to the same as the translated address for MMIO,
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* or to the domain local IO base for PIO (it will be fixed up later)
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*/
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if (iotype == UPIO_MEM)
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base = addr;
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else
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base = addrp[2];
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/* Try to guess an index... If we have subdevices of the pci dev,
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* we get to their "reg" property
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*/
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if (np != pci_dev) {
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u32 *reg = (u32 *)get_property(np, "reg", NULL);
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if (reg && (*reg < 4))
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index = lindex = *reg;
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}
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/* Local index means it's the Nth port in the PCI chip. Unfortunately
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* the offset to add here is device specific. We know about those
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* EXAR ports and we default to the most common case. If your UART
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* doesn't work for these settings, you'll have to add your own special
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* cases here
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*/
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if (device_is_compatible(pci_dev, "pci13a8,152") ||
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device_is_compatible(pci_dev, "pci13a8,154") ||
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device_is_compatible(pci_dev, "pci13a8,158")) {
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addr += 0x200 * lindex;
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base += 0x200 * lindex;
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} else {
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addr += 8 * lindex;
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base += 8 * lindex;
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}
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/* Add port, irq will be dealt with later. We passed a translated
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* IO port value. It will be fixed up later along with the irq
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*/
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return add_legacy_port(np, index, iotype, base, addr, NO_IRQ,
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UPF_BOOT_AUTOCONF, np != pci_dev);
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}
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#endif
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static void __init setup_legacy_serial_console(int console)
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{
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struct legacy_serial_info *info =
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&legacy_serial_infos[console];
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void __iomem *addr;
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if (info->taddr == 0)
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return;
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addr = ioremap(info->taddr, 0x1000);
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if (addr == NULL)
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return;
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if (info->speed == 0)
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info->speed = udbg_probe_uart_speed(addr, info->clock);
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DBG("default console speed = %d\n", info->speed);
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udbg_init_uart(addr, info->speed, info->clock);
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}
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/*
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* This is called very early, as part of setup_system() or eventually
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* setup_arch(), basically before anything else in this file. This function
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* will try to build a list of all the available 8250-compatible serial ports
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* in the machine using the Open Firmware device-tree. It currently only deals
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* with ISA and PCI busses but could be extended. It allows a very early boot
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* console to be initialized, that list is also used later to provide 8250 with
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* the machine non-PCI ports and to properly pick the default console port
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*/
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void __init find_legacy_serial_ports(void)
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{
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struct device_node *np, *stdout = NULL;
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char *path;
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int index;
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DBG(" -> find_legacy_serial_port()\n");
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/* Now find out if one of these is out firmware console */
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path = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
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if (path != NULL) {
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stdout = of_find_node_by_path(path);
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if (stdout)
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DBG("stdout is %s\n", stdout->full_name);
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} else {
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DBG(" no linux,stdout-path !\n");
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}
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/* First fill our array with SOC ports */
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for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
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struct device_node *soc = of_get_parent(np);
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if (soc && !strcmp(soc->type, "soc")) {
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index = add_legacy_soc_port(np, np);
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if (index >= 0 && np == stdout)
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legacy_serial_console = index;
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}
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of_node_put(soc);
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}
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/* First fill our array with ISA ports */
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for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
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struct device_node *isa = of_get_parent(np);
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if (isa && !strcmp(isa->name, "isa")) {
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index = add_legacy_isa_port(np, isa);
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if (index >= 0 && np == stdout)
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legacy_serial_console = index;
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}
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of_node_put(isa);
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}
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/* First fill our array with tsi-bridge ports */
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for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
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struct device_node *tsi = of_get_parent(np);
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if (tsi && !strcmp(tsi->type, "tsi-bridge")) {
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index = add_legacy_soc_port(np, np);
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if (index >= 0 && np == stdout)
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legacy_serial_console = index;
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}
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of_node_put(tsi);
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}
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#ifdef CONFIG_PCI
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/* Next, try to locate PCI ports */
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for (np = NULL; (np = of_find_all_nodes(np));) {
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struct device_node *pci, *parent = of_get_parent(np);
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if (parent && !strcmp(parent->name, "isa")) {
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of_node_put(parent);
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continue;
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}
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if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
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of_node_put(parent);
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continue;
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}
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/* Check for known pciclass, and also check wether we have
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* a device with child nodes for ports or not
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*/
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if (device_is_compatible(np, "pciclass,0700") ||
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device_is_compatible(np, "pciclass,070002"))
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pci = np;
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else if (device_is_compatible(parent, "pciclass,0700") ||
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device_is_compatible(parent, "pciclass,070002"))
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pci = parent;
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else {
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of_node_put(parent);
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continue;
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}
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index = add_legacy_pci_port(np, pci);
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if (index >= 0 && np == stdout)
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legacy_serial_console = index;
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of_node_put(parent);
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}
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#endif
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DBG("legacy_serial_console = %d\n", legacy_serial_console);
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if (legacy_serial_console >= 0)
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setup_legacy_serial_console(legacy_serial_console);
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DBG(" <- find_legacy_serial_port()\n");
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}
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static struct platform_device serial_device = {
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.name = "serial8250",
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.id = PLAT8250_DEV_PLATFORM,
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.dev = {
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.platform_data = legacy_serial_ports,
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},
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};
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static void __init fixup_port_irq(int index,
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struct device_node *np,
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struct plat_serial8250_port *port)
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{
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unsigned int virq;
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DBG("fixup_port_irq(%d)\n", index);
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virq = irq_of_parse_and_map(np, 0);
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if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) {
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np = of_get_parent(np);
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if (np == NULL)
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return;
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virq = irq_of_parse_and_map(np, 0);
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of_node_put(np);
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}
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if (virq == NO_IRQ)
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return;
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port->irq = virq;
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}
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static void __init fixup_port_pio(int index,
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struct device_node *np,
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struct plat_serial8250_port *port)
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{
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#ifdef CONFIG_PCI
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struct pci_controller *hose;
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DBG("fixup_port_pio(%d)\n", index);
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hose = pci_find_hose_for_OF_device(np);
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if (hose) {
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unsigned long offset = (unsigned long)hose->io_base_virt -
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#ifdef CONFIG_PPC64
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pci_io_base;
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#else
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isa_io_base;
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#endif
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DBG("port %d, IO %lx -> %lx\n",
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index, port->iobase, port->iobase + offset);
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port->iobase += offset;
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}
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#endif
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}
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static void __init fixup_port_mmio(int index,
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struct device_node *np,
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struct plat_serial8250_port *port)
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{
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DBG("fixup_port_mmio(%d)\n", index);
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port->membase = ioremap(port->mapbase, 0x100);
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}
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/*
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* This is called as an arch initcall, hopefully before the PCI bus is
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* probed and/or the 8250 driver loaded since we need to register our
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* platform devices before 8250 PCI ones are detected as some of them
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* must properly "override" the platform ones.
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*
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* This function fixes up the interrupt value for platform ports as it
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* couldn't be done earlier before interrupt maps have been parsed. It
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* also "corrects" the IO address for PIO ports for the same reason,
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* since earlier, the PHBs virtual IO space wasn't assigned yet. It then
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* registers all those platform ports for use by the 8250 driver when it
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* finally loads.
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*/
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static int __init serial_dev_init(void)
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{
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int i;
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if (legacy_serial_count == 0)
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return -ENODEV;
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/*
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* Before we register the platfrom serial devices, we need
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* to fixup their interrutps and their IO ports.
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*/
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DBG("Fixing serial ports interrupts and IO ports ...\n");
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for (i = 0; i < legacy_serial_count; i++) {
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struct plat_serial8250_port *port = &legacy_serial_ports[i];
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struct device_node *np = legacy_serial_infos[i].np;
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if (port->irq == NO_IRQ)
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fixup_port_irq(i, np, port);
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if (port->iotype == UPIO_PORT)
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fixup_port_pio(i, np, port);
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if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
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fixup_port_mmio(i, np, port);
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}
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DBG("Registering platform serial ports\n");
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return platform_device_register(&serial_device);
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}
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arch_initcall(serial_dev_init);
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/*
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* This is called very early, as part of console_init() (typically just after
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* time_init()). This function is respondible for trying to find a good
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* default console on serial ports. It tries to match the open firmware
|
|
* default output with one of the available serial console drivers, either
|
|
* one of the platform serial ports that have been probed earlier by
|
|
* find_legacy_serial_ports() or some more platform specific ones.
|
|
*/
|
|
static int __init check_legacy_serial_console(void)
|
|
{
|
|
struct device_node *prom_stdout = NULL;
|
|
int speed = 0, offset = 0;
|
|
char *name;
|
|
u32 *spd;
|
|
|
|
DBG(" -> check_legacy_serial_console()\n");
|
|
|
|
/* The user has requested a console so this is already set up. */
|
|
if (strstr(saved_command_line, "console=")) {
|
|
DBG(" console was specified !\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!of_chosen) {
|
|
DBG(" of_chosen is NULL !\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (legacy_serial_console < 0) {
|
|
DBG(" legacy_serial_console not found !\n");
|
|
return -ENODEV;
|
|
}
|
|
/* We are getting a weird phandle from OF ... */
|
|
/* ... So use the full path instead */
|
|
name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
|
|
if (name == NULL) {
|
|
DBG(" no linux,stdout-path !\n");
|
|
return -ENODEV;
|
|
}
|
|
prom_stdout = of_find_node_by_path(name);
|
|
if (!prom_stdout) {
|
|
DBG(" can't find stdout package %s !\n", name);
|
|
return -ENODEV;
|
|
}
|
|
DBG("stdout is %s\n", prom_stdout->full_name);
|
|
|
|
name = (char *)get_property(prom_stdout, "name", NULL);
|
|
if (!name) {
|
|
DBG(" stdout package has no name !\n");
|
|
goto not_found;
|
|
}
|
|
spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
|
|
if (spd)
|
|
speed = *spd;
|
|
|
|
if (0)
|
|
;
|
|
#ifdef CONFIG_SERIAL_8250_CONSOLE
|
|
else if (strcmp(name, "serial") == 0) {
|
|
int i;
|
|
/* Look for it in probed array */
|
|
for (i = 0; i < legacy_serial_count; i++) {
|
|
if (prom_stdout != legacy_serial_infos[i].np)
|
|
continue;
|
|
offset = i;
|
|
speed = legacy_serial_infos[i].speed;
|
|
break;
|
|
}
|
|
if (i >= legacy_serial_count)
|
|
goto not_found;
|
|
}
|
|
#endif /* CONFIG_SERIAL_8250_CONSOLE */
|
|
#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
|
|
else if (strcmp(name, "ch-a") == 0)
|
|
offset = 0;
|
|
else if (strcmp(name, "ch-b") == 0)
|
|
offset = 1;
|
|
#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
|
|
else
|
|
goto not_found;
|
|
of_node_put(prom_stdout);
|
|
|
|
DBG("Found serial console at ttyS%d\n", offset);
|
|
|
|
if (speed) {
|
|
static char __initdata opt[16];
|
|
sprintf(opt, "%d", speed);
|
|
return add_preferred_console("ttyS", offset, opt);
|
|
} else
|
|
return add_preferred_console("ttyS", offset, NULL);
|
|
|
|
not_found:
|
|
DBG("No preferred console found !\n");
|
|
of_node_put(prom_stdout);
|
|
return -ENODEV;
|
|
}
|
|
console_initcall(check_legacy_serial_console);
|
|
|