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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/mailbox.h>
 24 #include <linux/of.h>
 25 #include <linux/of_irq.h>
 26 #include <linux/of_platform.h>
 27 #include <linux/of_address.h>
 28 #include <linux/reboot.h>
 29 #include <linux/amba/bus.h>
 30 #include <linux/platform_device.h>
 31 
 32 #include <asm/psci.h>
 33 #include <asm/hardware/cache-l2x0.h>
 34 #include <asm/mach/arch.h>
 35 #include <asm/mach/map.h>
 36 
 37 #include "core.h"
 38 #include "sysregs.h"
 39 
 40 void __iomem *sregs_base;
 41 void __iomem *scu_base_addr;
 42 
 43 static void __init highbank_scu_map_io(void)
 44 {
 45         unsigned long base;
 46 
 47         /* Get SCU base */
 48         asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (base));
 49 
 50         scu_base_addr = ioremap(base, SZ_4K);
 51 }
 52 
 53 
 54 static void highbank_l2x0_disable(void)
 55 {
 56         outer_flush_all();
 57         /* Disable PL310 L2 Cache controller */
 58         highbank_smc1(0x102, 0x0);
 59 }
 60 
 61 static void __init highbank_init_irq(void)
 62 {
 63         irqchip_init();
 64 
 65         if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
 66                 highbank_scu_map_io();
 67 
 68         /* Enable PL310 L2 Cache controller */
 69         if (IS_ENABLED(CONFIG_CACHE_L2X0) &&
 70             of_find_compatible_node(NULL, NULL, "arm,pl310-cache")) {
 71                 highbank_smc1(0x102, 0x1);
 72                 l2x0_of_init(0, ~0UL);
 73                 outer_cache.disable = highbank_l2x0_disable;
 74         }
 75 }
 76 
 77 static void highbank_power_off(void)
 78 {
 79         highbank_set_pwr_shutdown();
 80 
 81         while (1)
 82                 cpu_do_idle();
 83 }
 84 
 85 static int highbank_platform_notifier(struct notifier_block *nb,
 86                                   unsigned long event, void *__dev)
 87 {
 88         struct resource *res;
 89         int reg = -1;
 90         u32 val;
 91         struct device *dev = __dev;
 92 
 93         if (event != BUS_NOTIFY_ADD_DEVICE)
 94                 return NOTIFY_DONE;
 95 
 96         if (of_device_is_compatible(dev->of_node, "calxeda,hb-ahci"))
 97                 reg = 0xc;
 98         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-sdhci"))
 99                 reg = 0x18;
100         else if (of_device_is_compatible(dev->of_node, "arm,pl330"))
101                 reg = 0x20;
102         else if (of_device_is_compatible(dev->of_node, "calxeda,hb-xgmac")) {
103                 res = platform_get_resource(to_platform_device(dev),
104                                             IORESOURCE_MEM, 0);
105                 if (res) {
106                         if (res->start == 0xfff50000)
107                                 reg = 0;
108                         else if (res->start == 0xfff51000)
109                                 reg = 4;
110                 }
111         }
112 
113         if (reg < 0)
114                 return NOTIFY_DONE;
115 
116         if (of_property_read_bool(dev->of_node, "dma-coherent")) {
117                 val = readl(sregs_base + reg);
118                 writel(val | 0xff01, sregs_base + reg);
119                 set_dma_ops(dev, &arm_coherent_dma_ops);
120         }
121 
122         return NOTIFY_OK;
123 }
124 
125 static struct notifier_block highbank_amba_nb = {
126         .notifier_call = highbank_platform_notifier,
127 };
128 
129 static struct notifier_block highbank_platform_nb = {
130         .notifier_call = highbank_platform_notifier,
131 };
132 
133 static struct platform_device highbank_cpuidle_device = {
134         .name = "cpuidle-calxeda",
135 };
136 
137 static int hb_keys_notifier(struct notifier_block *nb, unsigned long event, void *data)
138 {
139         u32 key = *(u32 *)data;
140 
141         if (event != 0x1000)
142                 return 0;
143 
144         if (key == KEY_POWER)
145                 orderly_poweroff(false);
146         else if (key == 0xffff)
147                 ctrl_alt_del();
148 
149         return 0;
150 }
151 static struct notifier_block hb_keys_nb = {
152         .notifier_call = hb_keys_notifier,
153 };
154 
155 static void __init highbank_init(void)
156 {
157         struct device_node *np;
158 
159         /* Map system registers */
160         np = of_find_compatible_node(NULL, NULL, "calxeda,hb-sregs");
161         sregs_base = of_iomap(np, 0);
162         WARN_ON(!sregs_base);
163 
164         pm_power_off = highbank_power_off;
165         highbank_pm_init();
166 
167         bus_register_notifier(&platform_bus_type, &highbank_platform_nb);
168         bus_register_notifier(&amba_bustype, &highbank_amba_nb);
169 
170         pl320_ipc_register_notifier(&hb_keys_nb);
171 
172         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
173 
174         if (psci_ops.cpu_suspend)
175                 platform_device_register(&highbank_cpuidle_device);
176 }
177 
178 static const char *highbank_match[] __initconst = {
179         "calxeda,highbank",
180         "calxeda,ecx-2000",
181         NULL,
182 };
183 
184 DT_MACHINE_START(HIGHBANK, "Highbank")
185 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
186         .dma_zone_size  = (4ULL * SZ_1G),
187 #endif
188         .init_irq       = highbank_init_irq,
189         .init_machine   = highbank_init,
190         .dt_compat      = highbank_match,
191         .restart        = highbank_restart,
192 MACHINE_END
193 

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