diff options
Diffstat (limited to 'arch/arm/mach-versatile/integrator_ap.c')
| -rw-r--r-- | arch/arm/mach-versatile/integrator_ap.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/arch/arm/mach-versatile/integrator_ap.c b/arch/arm/mach-versatile/integrator_ap.c new file mode 100644 index 000000000000..e216fac917d0 --- /dev/null +++ b/arch/arm/mach-versatile/integrator_ap.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2000-2003 Deep Blue Solutions Ltd + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/syscore_ops.h> +#include <linux/amba/bus.h> +#include <linux/io.h> +#include <linux/irqchip.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/termios.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> + +#include <asm/mach/arch.h> +#include <asm/mach/map.h> + +#include "integrator-hardware.h" +#include "integrator-cm.h" +#include "integrator.h" + +/* Regmap to the AP system controller */ +static struct regmap *ap_syscon_map; + +/* + * All IO addresses are mapped onto VA 0xFFFx.xxxx, where x.xxxx + * is the (PA >> 12). + * + * Setup a VA for the Integrator interrupt controller (for header #0, + * just for now). + */ +#define VA_IC_BASE __io_address(INTEGRATOR_IC_BASE) + +/* + * Logical Physical + * f1400000 14000000 Interrupt controller + * f1600000 16000000 UART 0 + */ + +static struct map_desc ap_io_desc[] __initdata __maybe_unused = { + { + .virtual = IO_ADDRESS(INTEGRATOR_IC_BASE), + .pfn = __phys_to_pfn(INTEGRATOR_IC_BASE), + .length = SZ_4K, + .type = MT_DEVICE + }, { + .virtual = IO_ADDRESS(INTEGRATOR_UART0_BASE), + .pfn = __phys_to_pfn(INTEGRATOR_UART0_BASE), + .length = SZ_4K, + .type = MT_DEVICE + } +}; + +static void __init ap_map_io(void) +{ + iotable_init(ap_io_desc, ARRAY_SIZE(ap_io_desc)); +} + +#ifdef CONFIG_PM +static unsigned long ic_irq_enable; + +static int irq_suspend(void) +{ + ic_irq_enable = readl(VA_IC_BASE + IRQ_ENABLE); + return 0; +} + +static void irq_resume(void) +{ + /* disable all irq sources */ + cm_clear_irqs(); + writel(-1, VA_IC_BASE + IRQ_ENABLE_CLEAR); + writel(-1, VA_IC_BASE + FIQ_ENABLE_CLEAR); + + writel(ic_irq_enable, VA_IC_BASE + IRQ_ENABLE_SET); +} +#else +#define irq_suspend NULL +#define irq_resume NULL +#endif + +static struct syscore_ops irq_syscore_ops = { + .suspend = irq_suspend, + .resume = irq_resume, +}; + +static int __init irq_syscore_init(void) +{ + register_syscore_ops(&irq_syscore_ops); + + return 0; +} + +device_initcall(irq_syscore_init); + +/* + * For the PL010 found in the Integrator/AP some of the UART control is + * implemented in the system controller and accessed using a callback + * from the driver. + */ +static void integrator_uart_set_mctrl(struct amba_device *dev, + void __iomem *base, unsigned int mctrl) +{ + unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask; + u32 phybase = dev->res.start; + int ret; + + if (phybase == INTEGRATOR_UART0_BASE) { + /* UART0 */ + rts_mask = 1 << 4; + dtr_mask = 1 << 5; + } else { + /* UART1 */ + rts_mask = 1 << 6; + dtr_mask = 1 << 7; + } + + if (mctrl & TIOCM_RTS) + ctrlc |= rts_mask; + else + ctrls |= rts_mask; + + if (mctrl & TIOCM_DTR) + ctrlc |= dtr_mask; + else + ctrls |= dtr_mask; + + ret = regmap_write(ap_syscon_map, + INTEGRATOR_SC_CTRLS_OFFSET, + ctrls); + if (ret) + pr_err("MODEM: unable to write PL010 UART CTRLS\n"); + + ret = regmap_write(ap_syscon_map, + INTEGRATOR_SC_CTRLC_OFFSET, + ctrlc); + if (ret) + pr_err("MODEM: unable to write PL010 UART CRTLC\n"); +} + +struct amba_pl010_data ap_uart_data = { + .set_mctrl = integrator_uart_set_mctrl, +}; + +static void __init ap_init_irq_of(void) +{ + cm_init(); + irqchip_init(); +} + +/* For the Device Tree, add in the UART callbacks as AUXDATA */ +static struct of_dev_auxdata ap_auxdata_lookup[] __initdata = { + OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE, + "uart0", &ap_uart_data), + OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE, + "uart1", &ap_uart_data), + { /* sentinel */ }, +}; + +static const struct of_device_id ap_syscon_match[] = { + { .compatible = "arm,integrator-ap-syscon"}, + { }, +}; + +static void __init ap_init_of(void) +{ + struct device_node *syscon; + + of_platform_default_populate(NULL, ap_auxdata_lookup, NULL); + + syscon = of_find_matching_node(NULL, ap_syscon_match); + if (!syscon) + return; + ap_syscon_map = syscon_node_to_regmap(syscon); + if (IS_ERR(ap_syscon_map)) { + pr_crit("could not find Integrator/AP system controller\n"); + return; + } +} + +static const char * ap_dt_board_compat[] = { + "arm,integrator-ap", + NULL, +}; + +DT_MACHINE_START(INTEGRATOR_AP_DT, "ARM Integrator/AP (Device Tree)") + .reserve = integrator_reserve, + .map_io = ap_map_io, + .init_irq = ap_init_irq_of, + .init_machine = ap_init_of, + .dt_compat = ap_dt_board_compat, +MACHINE_END |