-/*
- * We scan the PROM tree recursively. This is the most reliable way
- * to find Zilog nodes on various platforms. However, we face an extreme
- * shortage of kernel stack, so we must be very careful. To that end,
- * we scan only to a certain depth, and we use a common property buffer
- * in the scan structure.
- */
-#define ZS_PROPSIZE 128
-#define ZS_SCAN_DEPTH 5
-
-struct zs_probe_scan {
- int depth;
- void (*scanner)(struct zs_probe_scan *t, int node);
-
- int devices;
- char prop[ZS_PROPSIZE];
-};
-
-static int __inline__ sunzilog_node_ok(int node, const char *name, int len)
-{
- if (strncmp(name, "zs", len) == 0)
- return 1;
- /* Don't fold this procedure just yet. Compare to su_node_ok(). */
- return 0;
-}
-
-static void __init sunzilog_scan(struct zs_probe_scan *t, int node)
-{
- int len;
-
- for (; node != 0; node = prom_getsibling(node)) {
- len = prom_getproperty(node, "name", t->prop, ZS_PROPSIZE);
- if (len <= 1)
- continue; /* Broken PROM node */
- if (sunzilog_node_ok(node, t->prop, len)) {
- (*t->scanner)(t, node);
- } else {
- if (t->depth < ZS_SCAN_DEPTH) {
- t->depth++;
- sunzilog_scan(t, prom_getchild(node));
- --t->depth;
- }
- }
- }
-}
-
-static void __init sunzilog_prepare(void)
-{
- struct uart_sunzilog_port *up;
- struct zilog_layout __iomem *rp;
- int channel, chip;
-
- /*
- * Temporary fix.
- */
- for (channel = 0; channel < NUM_CHANNELS; channel++)
- spin_lock_init(&sunzilog_port_table[channel].port.lock);
-
- sunzilog_irq_chain = up = &sunzilog_port_table[0];
- for (channel = 0; channel < NUM_CHANNELS - 1; channel++)
- up[channel].next = &up[channel + 1];
- up[channel].next = NULL;
-
- for (chip = 0; chip < NUM_SUNZILOG; chip++) {
- rp = sunzilog_chip_regs[chip];
- up[(chip * 2) + 0].port.membase = (void __iomem *)&rp->channelA;
- up[(chip * 2) + 1].port.membase = (void __iomem *)&rp->channelB;
-
- /* Channel A */
- up[(chip * 2) + 0].port.iotype = UPIO_MEM;
- up[(chip * 2) + 0].port.irq = zilog_irq;
- up[(chip * 2) + 0].port.uartclk = ZS_CLOCK;
- up[(chip * 2) + 0].port.fifosize = 1;
- up[(chip * 2) + 0].port.ops = &sunzilog_pops;
- up[(chip * 2) + 0].port.type = PORT_SUNZILOG;
- up[(chip * 2) + 0].port.flags = 0;
- up[(chip * 2) + 0].port.line = (chip * 2) + 0;
- up[(chip * 2) + 0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
-
- /* Channel B */
- up[(chip * 2) + 1].port.iotype = UPIO_MEM;
- up[(chip * 2) + 1].port.irq = zilog_irq;
- up[(chip * 2) + 1].port.uartclk = ZS_CLOCK;
- up[(chip * 2) + 1].port.fifosize = 1;
- up[(chip * 2) + 1].port.ops = &sunzilog_pops;
- up[(chip * 2) + 1].port.type = PORT_SUNZILOG;
- up[(chip * 2) + 1].port.flags = 0;
- up[(chip * 2) + 1].port.line = (chip * 2) + 1;
- up[(chip * 2) + 1].flags |= 0;
- }
-}
-