2 * Sonics Silicon Backplane
3 * Broadcom MIPS core driver
5 * Copyright 2005, Broadcom Corporation
6 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
8 * Licensed under the GNU/GPL. See COPYING for details.
11 #include <linux/ssb/ssb.h>
13 #include <linux/serial.h>
14 #include <linux/serial_core.h>
15 #include <linux/serial_reg.h>
16 #include <linux/time.h>
18 #include "ssb_private.h"
21 static inline u32 mips_read32(struct ssb_mipscore *mcore,
24 return ssb_read32(mcore->dev, offset);
27 static inline void mips_write32(struct ssb_mipscore *mcore,
31 ssb_write32(mcore->dev, offset, value);
34 static const u32 ipsflag_irq_mask[] = {
42 static const u32 ipsflag_irq_shift[] = {
44 SSB_IPSFLAG_IRQ1_SHIFT,
45 SSB_IPSFLAG_IRQ2_SHIFT,
46 SSB_IPSFLAG_IRQ3_SHIFT,
47 SSB_IPSFLAG_IRQ4_SHIFT,
50 static inline u32 ssb_irqflag(struct ssb_device *dev)
52 return ssb_read32(dev, SSB_TPSFLAG) & SSB_TPSFLAG_BPFLAG;
55 /* Get the MIPS IRQ assignment for a specified device.
56 * If unassigned, 0 is returned.
58 unsigned int ssb_mips_irq(struct ssb_device *dev)
60 struct ssb_bus *bus = dev->bus;
66 irqflag = ssb_irqflag(dev);
67 ipsflag = ssb_read32(bus->mipscore.dev, SSB_IPSFLAG);
68 for (irq = 1; irq <= 4; irq++) {
69 tmp = ((ipsflag & ipsflag_irq_mask[irq]) >> ipsflag_irq_shift[irq]);
79 static void clear_irq(struct ssb_bus *bus, unsigned int irq)
81 struct ssb_device *dev = bus->mipscore.dev;
83 /* Clear the IRQ in the MIPScore backplane registers */
85 ssb_write32(dev, SSB_INTVEC, 0);
87 ssb_write32(dev, SSB_IPSFLAG,
88 ssb_read32(dev, SSB_IPSFLAG) |
89 ipsflag_irq_mask[irq]);
93 static void set_irq(struct ssb_device *dev, unsigned int irq)
95 unsigned int oldirq = ssb_mips_irq(dev);
96 struct ssb_bus *bus = dev->bus;
97 struct ssb_device *mdev = bus->mipscore.dev;
98 u32 irqflag = ssb_irqflag(dev);
102 ssb_dprintk(KERN_INFO PFX
103 "set_irq: core 0x%04x, irq %d => %d\n",
104 dev->id.coreid, oldirq, irq);
105 /* clear the old irq */
107 ssb_write32(mdev, SSB_INTVEC, (~(1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
109 clear_irq(bus, oldirq);
111 /* assign the new one */
113 ssb_write32(mdev, SSB_INTVEC, ((1 << irqflag) & ssb_read32(mdev, SSB_INTVEC)));
115 irqflag <<= ipsflag_irq_shift[irq];
116 irqflag |= (ssb_read32(mdev, SSB_IPSFLAG) & ~ipsflag_irq_mask[irq]);
117 ssb_write32(mdev, SSB_IPSFLAG, irqflag);
120 static void ssb_mips_serial_init(struct ssb_mipscore *mcore)
122 struct ssb_bus *bus = mcore->dev->bus;
125 mcore->nr_serial_ports = ssb_extif_serial_init(&bus->extif, mcore->serial_ports);
126 else if (bus->chipco.dev)
127 mcore->nr_serial_ports = ssb_chipco_serial_init(&bus->chipco, mcore->serial_ports);
129 mcore->nr_serial_ports = 0;
132 static void ssb_mips_flash_detect(struct ssb_mipscore *mcore)
134 struct ssb_bus *bus = mcore->dev->bus;
136 mcore->flash_buswidth = 2;
137 if (bus->chipco.dev) {
138 mcore->flash_window = 0x1c000000;
139 mcore->flash_window_size = 0x02000000;
140 if ((ssb_read32(bus->chipco.dev, SSB_CHIPCO_FLASH_CFG)
141 & SSB_CHIPCO_CFG_DS16) == 0)
142 mcore->flash_buswidth = 1;
144 mcore->flash_window = 0x1fc00000;
145 mcore->flash_window_size = 0x00400000;
149 u32 ssb_cpu_clock(struct ssb_mipscore *mcore)
151 struct ssb_bus *bus = mcore->dev->bus;
152 u32 pll_type, n, m, rate = 0;
154 if (bus->extif.dev) {
155 ssb_extif_get_clockcontrol(&bus->extif, &pll_type, &n, &m);
156 } else if (bus->chipco.dev) {
157 ssb_chipco_get_clockcpu(&bus->chipco, &pll_type, &n, &m);
161 if ((pll_type == SSB_PLLTYPE_5) || (bus->chip_id == 0x5365)) {
164 rate = ssb_calc_clock_rate(pll_type, n, m);
167 if (pll_type == SSB_PLLTYPE_6) {
174 void ssb_mipscore_init(struct ssb_mipscore *mcore)
177 struct ssb_device *dev;
178 unsigned long hz, ns;
182 return; /* We don't have a MIPS core */
184 ssb_dprintk(KERN_INFO PFX "Initializing MIPS core...\n");
186 bus = mcore->dev->bus;
187 hz = ssb_clockspeed(bus);
190 ns = 1000000000 / hz;
193 ssb_extif_timing_init(&bus->extif, ns);
194 else if (bus->chipco.dev)
195 ssb_chipco_timing_init(&bus->chipco, ns);
197 /* Assign IRQs to all cores on the bus, start with irq line 2, because serial usually takes 1 */
198 for (irq = 2, i = 0; i < bus->nr_devices; i++) {
199 dev = &(bus->devices[i]);
200 dev->irq = ssb_mips_irq(dev) + 2;
201 switch (dev->id.coreid) {
202 case SSB_DEV_USB11_HOST:
203 /* shouldn't need a separate irq line for non-4710, most of them have a proper
204 * external usb controller on the pci */
205 if ((bus->chip_id == 0x4710) && (irq <= 4)) {
211 case SSB_DEV_ETHERNET:
213 case SSB_DEV_USB20_HOST:
214 /* These devices get their own IRQ line if available, the rest goes on IRQ0 */
222 ssb_mips_serial_init(mcore);
223 ssb_mips_flash_detect(mcore);