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Linux/arch/arm/mach-highbank/highbank.c

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  1 /*
  2  * Copyright 2010-2011 Calxeda, Inc.
  3  *
  4  * This program is free software; you can redistribute it and/or modify it
  5  * under the terms and conditions of the GNU General Public License,
  6  * version 2, as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope it will be useful, but WITHOUT
  9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 11  * more details.
 12  *
 13  * You should have received a copy of the GNU General Public License along with
 14  * this program.  If not, see <http://www.gnu.org/licenses/>.
 15  */
 16 #include <linux/clk.h>
 17 #include <linux/clkdev.h>
 18 #include <linux/clocksource.h>
 19 #include <linux/dma-mapping.h>
 20 #include <linux/input.h>
 21 #include <linux/io.h>
 22 #include <linux/irqchip.h>
 23 #include <linux/pl320-ipc.h>
 24 #include <linux/of.h>
 25 #include <linux/of_irq.h>
 26 #include <linux/of_address.h>
 27 #include <linux/reboot.h>
 28 #include <linux/amba/bus.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/psci.h>
 31 
 32 #include <asm/hardware/cache-l2x0.h>
 33 #include <asm/mach/arch.h>
 34 #include <asm/mach/map.h>
 35 
 36 #include "core.h"
 37 #include "sysregs.h"
 38 
 39 void __iomem *sregs_base;
 40 void __iomem *scu_base_addr;
 41 
 42 static void __init highbank_scu_map_io(void)
 43 {
 44         unsigned long base;
 45 
 46         /* Get SCU base */
 47         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
 48 
 49         scu_base_addr = ioremap(base, SZ_4K);
 50 }
 51 
 52 
 53 static void highbank_l2c310_write_sec(unsigned long val, unsigned reg)
 54 {
 55         if (reg == L2X0_CTRL)
 56                 highbank_smc1(0x102, val);
 57         else
 58                 WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n",
 59                           reg);
 60 }
 61 
 62 static void __init highbank_init_irq(void)
 63 {
 64         irqchip_init();
 65 
 66         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
 67                 highbank_scu_map_io();
 68 }
 69 
 70 static void highbank_power_off(void)
 71 {
 72         highbank_set_pwr_shutdown();
 73 
 74         while (1)
 75                 cpu_do_idle();
 76 }
 77 
 78 static int highbank_platform_notifier(struct notifier_block *nb,
 79                                   unsigned long event, void *__dev)
 80 {
 81         struct resource *res;
 82         int reg = -1;
 83         u32 val;
 84         struct device *dev = __dev;
 85 
 86         if (event != BUS_NOTIFY_ADD_DEVICE)
 87                 return NOTIFY_DONE;
 88 
 89         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
 90                 reg = 0xc;
 91         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
 92                 reg = 0x18;
 93         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
 94                 reg = 0x20;
 95         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
 96                 res = platform_get_resource(to_platform_device(dev),
 97                                             IORESOURCE_MEM, 0);
 98                 if (res) {
 99                         if (res->start == 0xfff50000)
100                                 reg = 0;
101                         else if (res->start == 0xfff51000)
102                                 reg = 4;
103                 }
104         }
105 
106         if (reg < 0)
107                 return NOTIFY_DONE;
108 
109         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
110                 val = readl(sregs_base + reg);
111                 writel(val | 0xff01, sregs_base + reg);
112                 set_dma_ops(dev, &arm_coherent_dma_ops);
113         }
114 
115         return NOTIFY_OK;
116 }
117 
118 static struct notifier_block highbank_amba_nb = {
119         .notifier_call = highbank_platform_notifier,
120 };
121 
122 static struct notifier_block highbank_platform_nb = {
123         .notifier_call = highbank_platform_notifier,
124 };
125 
126 static struct platform_device highbank_cpuidle_device = {
127         .name = "cpuidle-calxeda",
128 };
129 
130 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
131 {
132         u32 key = *(u32 *)data;
133 
134         if (event != 0x1000)
135                 return 0;
136 
137         if (key == KEY_POWER)
138                 orderly_poweroff(false);
139         else if (key == 0xffff)
140                 ctrl_alt_del();
141 
142         return 0;
143 }
144 static struct notifier_block hb_keys_nb = {
145         .notifier_call = hb_keys_notifier,
146 };
147 
148 static void __init highbank_init(void)
149 {
150         struct device_node *np;
151 
152         /* Map system registers */
153         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
154         sregs_base = of_iomap(np, 0);
155         WARN_ON(!sregs_base);
156 
157         pm_power_off = highbank_power_off;
158         highbank_pm_init();
159 
160         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
161         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
162 
163         pl320_ipc_register_notifier(&hb_keys_nb);
164 
165         if (psci_ops.cpu_suspend)
166                 platform_device_register(&highbank_cpuidle_device);
167 }
168 
169 static const char *const highbank_match[] __initconst = {
170         "calxeda,highbank",
171         "calxeda,ecx-2000",
172         NULL,
173 };
174 
175 DT_MACHINE_START(HIGHBANK, "Highbank")
176 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
177         .dma_zone_size  = (4ULL * SZ_1G),
178 #endif
179         .l2c_aux_val    = 0,
180         .l2c_aux_mask   = ~0,
181         .l2c_write_sec  = highbank_l2c310_write_sec,
182         .init_irq       = highbank_init_irq,
183         .init_machine   = highbank_init,
184         .dt_compat      = highbank_match,
185         .restart        = highbank_restart,
186 MACHINE_END
187 

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