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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH V2 3/4] xen/arm: Add support for Broadcom 7445D0 A15 platform.
This code supports the Broadcom 7445D0 32-bit A15 based platform.
Signed-off-by: Jon Fraser <jfraser@xxxxxxxxxxxx>
---
xen/arch/arm/platforms/Makefile | 1 +
xen/arch/arm/platforms/brcm.c | 294 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 295 insertions(+)
create mode 100644 xen/arch/arm/platforms/brcm.c
diff --git a/xen/arch/arm/platforms/Makefile b/xen/arch/arm/platforms/Makefile
index 680364f..3b92dde 100644
--- a/xen/arch/arm/platforms/Makefile
+++ b/xen/arch/arm/platforms/Makefile
@@ -1,4 +1,5 @@
obj-y += vexpress.o
+obj-$(CONFIG_ARM_32) += brcm.o
obj-$(CONFIG_ARM_32) += exynos5.o
obj-$(CONFIG_ARM_32) += midway.o
obj-$(CONFIG_ARM_32) += omap5.o
diff --git a/xen/arch/arm/platforms/brcm.c b/xen/arch/arm/platforms/brcm.c
new file mode 100644
index 0000000..a10de22
--- /dev/null
+++ b/xen/arch/arm/platforms/brcm.c
@@ -0,0 +1,294 @@
+/*
+ * xen/arch/arm/platforms/brcm.c
+ *
+ * Broadcom Platform startup.
+ *
+ * Jon Fraser <jfraser@xxxxxxxxxxxx>
+ * Copyright (c) 2013-2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/platform.h>
+#include <xen/mm.h>
+#include <xen/vmap.h>
+#include <asm/io.h>
+#include <xen/delay.h>
+
+struct brcm_plat_regs {
+ uint32_t hif_mask;
+ uint32_t hif_cpu_reset_config;
+ uint32_t hif_boot_continuation;
+ uint32_t cpu0_pwr_zone_ctrl;
+ uint32_t scratch_reg;
+};
+
+static u32 brcm_boot_continuation_pc;
+
+static struct brcm_plat_regs regs;
+
+static __init int brcm_get_dt_node(char *compat_str,
+ const struct dt_device_node **dn,
+ u32 *reg_base)
+{
+ const struct dt_device_node *node;
+ u64 reg_base_64;
+ int rc;
+
+ node = dt_find_compatible_node(NULL, NULL, compat_str);
+ if ( !node )
+ {
+ dprintk(XENLOG_ERR, "%s: missing \"%s\" node\n", __func__, compat_str);
+ return -ENOENT;
+ }
+
+ rc = dt_device_get_address(node, 0, ®_base_64, NULL);
+ if ( rc )
+ {
+ dprintk(XENLOG_ERR, "%s: missing \"reg\" prop\n", __func__);
+ return rc;
+ }
+
+ if ( dn )
+ *dn = node;
+
+ if ( reg_base )
+ *reg_base = reg_base_64;
+
+ return 0;
+}
+
+static __init int brcm_populate_plat_regs(void)
+{
+ int rc;
+ const struct dt_device_node *node;
+ u32 reg_base;
+ u32 val;
+
+ rc = brcm_get_dt_node("brcm,brcmstb-cpu-biu-ctrl", &node, ®_base);
+ if ( rc )
+ return rc;
+
+ if ( !dt_property_read_u32(node, "cpu-reset-config-reg", &val) )
+ {
+ dprintk(XENLOG_ERR, "Missing property \"cpu-reset-config-reg\"\n");
+ return -ENOENT;
+ }
+ regs.hif_cpu_reset_config = reg_base + val;
+
+ if ( !dt_property_read_u32(node, "cpu0-pwr-zone-ctrl-reg", &val) )
+ {
+ dprintk(XENLOG_ERR, "Missing property \"cpu0-pwr-zone-ctrl-reg\"\n");
+ return -ENOENT;
+ }
+ regs.cpu0_pwr_zone_ctrl = reg_base + val;
+
+ if ( !dt_property_read_u32(node, "scratch-reg", &val) )
+ {
+ dprintk(XENLOG_ERR, "Missing property \"scratch-reg\"\n");
+ return -ENOENT;
+ }
+ regs.scratch_reg = reg_base + val;
+
+ rc = brcm_get_dt_node("brcm,brcmstb-hif-continuation", NULL, ®_base);
+ if ( rc )
+ return rc;
+
+ regs.hif_boot_continuation = reg_base;
+
+ dprintk(XENLOG_INFO, "hif_cpu_reset_config : %08xh\n",
+ regs.hif_cpu_reset_config);
+ dprintk(XENLOG_INFO, "cpu0_pwr_zone_ctrl : %08xh\n",
+ regs.cpu0_pwr_zone_ctrl);
+ dprintk(XENLOG_INFO, "hif_boot_continuation : %08xh\n",
+ regs.hif_boot_continuation);
+ dprintk(XENLOG_INFO, "scratch_reg : %08xh\n",
+ regs.scratch_reg);
+
+ return 0;
+}
+
+#define ZONE_PWR_UP_REQ (1 << 10)
+#define ZONE_PWR_ON_STATE (1 << 26)
+
+static int brcm_cpu_power_on(int cpu)
+{
+ u32 tmp;
+ void __iomem *pwr_ctl;
+ unsigned int timeout;
+
+ dprintk(XENLOG_ERR, "%s: Power on cpu %d\n", __func__, cpu);
+
+ pwr_ctl = ioremap_nocache(regs.cpu0_pwr_zone_ctrl + (cpu * sizeof(u32)),
+ sizeof(u32));
+
+ if ( !pwr_ctl )
+ {
+ dprintk(XENLOG_ERR, "%s: Unable to map \"cpu0_pwr_zone_ctrl\"\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ /* request core power on */
+ tmp = readl(pwr_ctl);
+ tmp |= ZONE_PWR_UP_REQ;
+ writel(tmp, pwr_ctl);
+
+ /*
+ * Wait for the cpu to power on.
+ * Wait a max of 10 msec.
+ */
+ timeout = 10;
+ tmp = readl(pwr_ctl);
+
+ while ( !(tmp & ZONE_PWR_ON_STATE) )
+ {
+ if ( timeout-- == 0 )
+ break;
+
+ mdelay(1);
+ tmp = readl(pwr_ctl);
+ }
+
+ iounmap(pwr_ctl);
+
+ if ( timeout == 0 )
+ {
+ dprintk(XENLOG_ERR, "CPU%d power enable failed", cpu);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int brcm_cpu_release(u32 cpu)
+{
+ u32 tmp;
+ u32 __iomem *reg;
+
+ dprintk(XENLOG_INFO, "%s: Taking cpu %d out of reset \n", __func__, cpu);
+
+ reg = ioremap_nocache(regs.hif_cpu_reset_config, sizeof(u32));
+ if ( !reg )
+ {
+ dprintk(XENLOG_ERR, "%s: Unable to map \"hif_cpu_reset_config\"\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ /* now take the cpu out of reset */
+ tmp = readl(reg);
+ tmp &= ~(1 << cpu);
+ writel(tmp, reg);
+
+ iounmap(reg);
+
+ return 0;
+}
+
+static int brcm_set_boot_continuation(u32 cpu, u32 pc)
+{
+ u32 __iomem *reg;
+ dprintk(XENLOG_INFO, "%s: cpu %d pc 0x%x\n", __func__, cpu, pc);
+
+ reg = ioremap_nocache(regs.hif_boot_continuation + (cpu * 2 * sizeof(u32)),
+ 2 * sizeof(u32));
+ if ( !reg )
+ {
+ dprintk(XENLOG_ERR, "%s: Unable to map \"hif_boot_continuation\"\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ writel(0, reg);
+ writel(pc, reg + 1);
+
+ iounmap(reg);
+
+ return 0;
+}
+
+static int brcm_cpu_up(int cpu)
+{
+ int rc;
+
+ rc = brcm_cpu_power_on(cpu);
+ if ( rc )
+ return rc;
+
+ rc = brcm_set_boot_continuation(cpu, brcm_boot_continuation_pc);
+ if ( rc )
+ return rc;
+
+ return brcm_cpu_release(cpu);
+}
+
+static int __init brcm_smp_init(void)
+{
+ u32 __iomem *scratch;
+ u32 target_pc;
+
+ scratch = ioremap_nocache(regs.scratch_reg, sizeof(u32));
+
+ if ( !scratch )
+ {
+ dprintk(XENLOG_ERR, "%s: Unable to map \"scratch_reg\"\n", __func__);
+ return -EFAULT;
+ }
+ /*
+ * The HIF CPU BIU CTRL Scratch Register is used to pass
+ * addresses between this code in xen and the boot helper.
+ * The helper puts its own entry point in the scratch register.
+ * That address is written to the cpu boot continuation registers.
+ * The helper expects xen to put xen's entry point back in the register.
+ * The helper will jump to that address.
+ * The helper is in SRAM, which will always be a 32 bit address.
+ */
+
+ brcm_boot_continuation_pc = readl(scratch);
+
+ target_pc = __pa(init_secondary);
+ writel(target_pc, scratch);
+
+ iounmap(scratch);
+
+ dprintk(XENLOG_INFO, "%s: target_pc 0x%x boot continuation pc 0x%x\n",
+ __func__, target_pc, brcm_boot_continuation_pc);
+
+ return 0;
+}
+
+static __init int brcm_init(void)
+{
+ return brcm_populate_plat_regs();
+}
+
+static const char const *brcm_dt_compat[] __initconst =
+{
+ "brcm,bcm7445d0",
+ NULL
+};
+
+PLATFORM_START(brcm, "Broadcom B15")
+ .compatible = brcm_dt_compat,
+ .init = brcm_init,
+ .smp_init = brcm_smp_init,
+ .cpu_up = brcm_cpu_up,
+PLATFORM_END
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.9.0.138.g2de3478
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