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656 lines
18 KiB
656 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#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 <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/serial_reg.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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|
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#undef DEBUG |
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|
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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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|
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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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|
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static const struct of_device_id legacy_serial_parents[] __initconst = { |
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{.type = "soc",}, |
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{.type = "tsi-bridge",}, |
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{.type = "opb", }, |
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{.compatible = "ibm,opb",}, |
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{.compatible = "simple-bus",}, |
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{.compatible = "wrs,epld-localbus",}, |
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{}, |
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}; |
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|
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static unsigned int legacy_serial_count; |
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static int legacy_serial_console = -1; |
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|
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static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | |
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UPF_SHARE_IRQ | UPF_FIXED_PORT; |
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|
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static unsigned int tsi_serial_in(struct uart_port *p, int offset) |
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{ |
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unsigned int tmp; |
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offset = offset << p->regshift; |
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if (offset == UART_IIR) { |
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tmp = readl(p->membase + (UART_IIR & ~3)); |
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return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */ |
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} else |
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return readb(p->membase + offset); |
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} |
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static void tsi_serial_out(struct uart_port *p, int offset, int value) |
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{ |
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offset = offset << p->regshift; |
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if (!((offset == UART_IER) && (value & UART_IER_UUE))) |
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writeb(value, p->membase + offset); |
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} |
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|
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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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const __be32 *clk, *spd, *rs; |
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u32 clock = BASE_BAUD * 16; |
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u32 shift = 0; |
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int index; |
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|
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/* get clock freq. if present */ |
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clk = of_get_property(np, "clock-frequency", NULL); |
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if (clk && *clk) |
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clock = be32_to_cpup(clk); |
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|
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/* get default speed if present */ |
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spd = of_get_property(np, "current-speed", NULL); |
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|
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/* get register shift if present */ |
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rs = of_get_property(np, "reg-shift", NULL); |
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if (rs && *rs) |
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shift = be32_to_cpup(rs); |
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|
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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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|
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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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|
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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 != NULL) { |
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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_ports[index].regshift = shift; |
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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 ? be32_to_cpup(spd) : 0; |
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legacy_serial_infos[index].irq_check_parent = irq_check_parent; |
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if (iotype == UPIO_TSI) { |
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legacy_serial_ports[index].serial_in = tsi_serial_in; |
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legacy_serial_ports[index].serial_out = tsi_serial_out; |
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} |
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printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n", |
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index, np); |
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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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const __be32 *addrp; |
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struct device_node *tsi = of_get_parent(np); |
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|
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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 (of_get_property(np, "clock-frequency", NULL) == NULL) |
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return -1; |
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|
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/* if reg-offset don't try to use it */ |
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if ((of_get_property(np, "reg-offset", NULL) != NULL)) |
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return -1; |
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|
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/* if rtas uses this device, don't try to use it as well */ |
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if (of_get_property(np, "used-by-rtas", 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 (of_node_is_type(tsi, "tsi-bridge")) |
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return add_legacy_port(np, -1, UPIO_TSI, addr, addr, |
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0, legacy_port_flags, 0); |
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else |
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return add_legacy_port(np, -1, UPIO_MEM, addr, addr, |
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0, legacy_port_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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const __be32 *reg; |
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const char *typep; |
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int index = -1; |
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u64 taddr; |
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DBG(" -> add_legacy_isa_port(%pOF)\n", np); |
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/* Get the ISA port number */ |
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reg = of_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 (!(be32_to_cpu(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 = of_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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|
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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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* Note: Don't even try on P8 lpc, we know it's not directly mapped |
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*/ |
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if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") || |
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of_get_property(isa_brg, "ranges", NULL)) { |
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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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} else |
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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, be32_to_cpu(reg[1]), |
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taddr, 0, legacy_port_flags, 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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const __be32 *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(%pOF)\n", np); |
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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 (of_get_property(np, "clock-frequency", NULL) == NULL) |
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return -1; |
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|
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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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|
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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 = of_read_number(&addrp[2], 1); |
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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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const __be32 *reg = of_get_property(np, "reg", NULL); |
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if (reg && (be32_to_cpup(reg) < 4)) |
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index = lindex = be32_to_cpup(reg); |
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} |
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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 (of_device_is_compatible(pci_dev, "pci13a8,152") || |
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of_device_is_compatible(pci_dev, "pci13a8,154") || |
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of_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, 0, |
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legacy_port_flags, 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 = &legacy_serial_infos[console]; |
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struct plat_serial8250_port *port = &legacy_serial_ports[console]; |
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void __iomem *addr; |
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unsigned int stride; |
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stride = 1 << port->regshift; |
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|
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/* Check if a translated MMIO address has been found */ |
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if (info->taddr) { |
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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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udbg_uart_init_mmio(addr, stride); |
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} else { |
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/* Check if it's PIO and we support untranslated PIO */ |
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if (port->iotype == UPIO_PORT && isa_io_special) |
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udbg_uart_init_pio(port->iobase, stride); |
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else |
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return; |
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} |
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/* Try to query the current speed */ |
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if (info->speed == 0) |
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info->speed = udbg_probe_uart_speed(info->clock); |
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/* Set it up */ |
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DBG("default console speed = %d\n", info->speed); |
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udbg_uart_setup(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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const 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 = of_get_property(of_chosen, "linux,stdout-path", NULL); |
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if (path == NULL) |
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path = of_get_property(of_chosen, "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 %pOF\n", stdout); |
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} else { |
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DBG(" no linux,stdout-path !\n"); |
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} |
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/* Iterate over all the 16550 ports, looking for known parents */ |
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for_each_compatible_node(np, "serial", "ns16550") { |
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struct device_node *parent = of_get_parent(np); |
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if (!parent) |
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continue; |
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if (of_match_node(legacy_serial_parents, parent) != NULL) { |
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if (of_device_is_available(np)) { |
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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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} |
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of_node_put(parent); |
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} |
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|
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/* Next, fill our array with ISA ports */ |
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for_each_node_by_type(np, "serial") { |
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struct device_node *isa = of_get_parent(np); |
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if (of_node_name_eq(isa, "isa") || of_node_name_eq(isa, "lpc")) { |
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if (of_device_is_available(np)) { |
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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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} |
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of_node_put(isa); |
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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 (of_node_name_eq(parent, "isa")) { |
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of_node_put(parent); |
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continue; |
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} |
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if (!of_node_name_eq(np, "serial") && |
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!of_node_is_type(np, "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 whether we have |
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* a device with child nodes for ports or not |
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*/ |
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if (of_device_is_compatible(np, "pciclass,0700") || |
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of_device_is_compatible(np, "pciclass,070002")) |
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pci = np; |
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else if (of_device_is_compatible(parent, "pciclass,0700") || |
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of_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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|
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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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|
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DBG("fixup_port_irq(%d)\n", index); |
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|
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virq = irq_of_parse_and_map(np, 0); |
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if (!virq && 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) |
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return; |
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|
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port->irq = virq; |
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|
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#ifdef CONFIG_SERIAL_8250_FSL |
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if (of_device_is_compatible(np, "fsl,ns16550")) { |
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port->handle_irq = fsl8250_handle_irq; |
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port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE); |
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} |
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#endif |
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} |
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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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|
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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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|
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port->membase = ioremap(port->mapbase, 0x100); |
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} |
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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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{ |
|
int i; |
|
|
|
if (legacy_serial_count == 0) |
|
return -ENODEV; |
|
|
|
/* |
|
* Before we register the platform serial devices, we need |
|
* to fixup their interrupts and their IO ports. |
|
*/ |
|
DBG("Fixing serial ports interrupts and IO ports ...\n"); |
|
|
|
for (i = 0; i < legacy_serial_count; i++) { |
|
struct plat_serial8250_port *port = &legacy_serial_ports[i]; |
|
struct device_node *np = legacy_serial_infos[i].np; |
|
|
|
if (!port->irq) |
|
fixup_port_irq(i, np, port); |
|
if (port->iotype == UPIO_PORT) |
|
fixup_port_pio(i, np, port); |
|
if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) |
|
fixup_port_mmio(i, np, port); |
|
} |
|
|
|
DBG("Registering platform serial ports\n"); |
|
|
|
return platform_device_register(&serial_device); |
|
} |
|
device_initcall(serial_dev_init); |
|
|
|
|
|
#ifdef CONFIG_SERIAL_8250_CONSOLE |
|
/* |
|
* This is called very early, as part of console_init() (typically just after |
|
* time_init()). This function is respondible for trying to find a good |
|
* default console on serial ports. It tries to match the open firmware |
|
* default output with one of the available serial console drivers that have |
|
* been probed earlier by find_legacy_serial_ports() |
|
*/ |
|
static int __init check_legacy_serial_console(void) |
|
{ |
|
struct device_node *prom_stdout = NULL; |
|
int i, speed = 0, offset = 0; |
|
const char *name; |
|
const __be32 *spd; |
|
|
|
DBG(" -> check_legacy_serial_console()\n"); |
|
|
|
/* The user has requested a console so this is already set up. */ |
|
if (strstr(boot_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 = of_get_property(of_chosen, "linux,stdout-path", NULL); |
|
if (name == NULL) |
|
name = of_get_property(of_chosen, "stdout-path", NULL); |
|
if (name == NULL) { |
|
DBG(" no 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 %pOF\n", prom_stdout); |
|
|
|
name = of_get_property(prom_stdout, "name", NULL); |
|
if (!name) { |
|
DBG(" stdout package has no name !\n"); |
|
goto not_found; |
|
} |
|
spd = of_get_property(prom_stdout, "current-speed", NULL); |
|
if (spd) |
|
speed = be32_to_cpup(spd); |
|
|
|
if (strcmp(name, "serial") != 0) |
|
goto not_found; |
|
|
|
/* 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; |
|
|
|
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); |
|
|
|
#endif /* CONFIG_SERIAL_8250_CONSOLE */
|
|
|