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148 lines
4.5 KiB
Diff
148 lines
4.5 KiB
Diff
From fc9e25ed9db2fcfbf16a9cbbf5a1f449da78f1d9 Mon Sep 17 00:00:00 2001
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From: Marek Szyprowski <m.szyprowski@samsung.com>
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Date: Fri, 28 Feb 2014 14:42:49 +0100
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Subject: [PATCH 051/182] drivers: of: add support for custom reserved memory
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drivers
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Add support for custom reserved memory drivers. Call their init() function
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for each reserved region and prepare for using operations provided by them
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with by the reserved_mem->ops array.
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Based on previous code provided by Josh Cartwright <joshc@codeaurora.org>
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Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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Signed-off-by: Grant Likely <grant.likely@linaro.org>
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---
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drivers/of/of_reserved_mem.c | 29 +++++++++++++++++++++++++++++
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include/asm-generic/vmlinux.lds.h | 11 +++++++++++
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include/linux/of_reserved_mem.h | 32 ++++++++++++++++++++++++++++++++
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3 files changed, 72 insertions(+)
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--- a/drivers/of/of_reserved_mem.c
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+++ b/drivers/of/of_reserved_mem.c
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@@ -170,6 +170,33 @@ static int __init __reserved_mem_alloc_s
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return 0;
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}
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+static const struct of_device_id __rmem_of_table_sentinel
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+ __used __section(__reservedmem_of_table_end);
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+
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+/**
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+ * res_mem_init_node() - call region specific reserved memory init code
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+ */
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+static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
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+{
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+ extern const struct of_device_id __reservedmem_of_table[];
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+ const struct of_device_id *i;
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+
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+ for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
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+ reservedmem_of_init_fn initfn = i->data;
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+ const char *compat = i->compatible;
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+
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+ if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
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+ continue;
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+
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+ if (initfn(rmem, rmem->fdt_node, rmem->name) == 0) {
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+ pr_info("Reserved memory: initialized node %s, compatible id %s\n",
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+ rmem->name, compat);
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+ return 0;
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+ }
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+ }
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+ return -ENOENT;
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+}
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+
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/**
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* fdt_init_reserved_mem - allocate and init all saved reserved memory regions
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*/
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@@ -184,5 +211,7 @@ void __init fdt_init_reserved_mem(void)
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if (rmem->size == 0)
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err = __reserved_mem_alloc_size(node, rmem->name,
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&rmem->base, &rmem->size);
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+ if (err == 0)
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+ __reserved_mem_init_node(rmem);
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}
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}
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--- a/include/asm-generic/vmlinux.lds.h
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+++ b/include/asm-generic/vmlinux.lds.h
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@@ -177,6 +177,16 @@
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#define CLK_OF_TABLES()
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#endif
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+#ifdef CONFIG_OF_RESERVED_MEM
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+#define RESERVEDMEM_OF_TABLES() \
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+ . = ALIGN(8); \
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+ VMLINUX_SYMBOL(__reservedmem_of_table) = .; \
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+ *(__reservedmem_of_table) \
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+ *(__reservedmem_of_table_end)
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+#else
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+#define RESERVEDMEM_OF_TABLES()
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+#endif
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+
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#ifdef CONFIG_SMP
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#define CPU_METHOD_OF_TABLES() . = ALIGN(8); \
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VMLINUX_SYMBOL(__cpu_method_of_table_begin) = .; \
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@@ -510,6 +520,7 @@
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TRACE_SYSCALLS() \
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MEM_DISCARD(init.rodata) \
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CLK_OF_TABLES() \
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+ RESERVEDMEM_OF_TABLES() \
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CLKSRC_OF_TABLES() \
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CPU_METHOD_OF_TABLES() \
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KERNEL_DTB() \
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--- a/include/linux/of_reserved_mem.h
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+++ b/include/linux/of_reserved_mem.h
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@@ -1,21 +1,53 @@
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#ifndef __OF_RESERVED_MEM_H
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#define __OF_RESERVED_MEM_H
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+struct device;
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+struct of_phandle_args;
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+struct reserved_mem_ops;
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+
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struct reserved_mem {
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const char *name;
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unsigned long fdt_node;
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+ const struct reserved_mem_ops *ops;
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phys_addr_t base;
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phys_addr_t size;
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+ void *priv;
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+};
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+
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+struct reserved_mem_ops {
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+ void (*device_init)(struct reserved_mem *rmem,
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+ struct device *dev);
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+ void (*device_release)(struct reserved_mem *rmem,
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+ struct device *dev);
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};
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+typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem,
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+ unsigned long node, const char *uname);
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+
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#ifdef CONFIG_OF_RESERVED_MEM
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void fdt_init_reserved_mem(void);
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void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
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phys_addr_t base, phys_addr_t size);
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+
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+#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
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+ static const struct of_device_id __reservedmem_of_table_##name \
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+ __used __section(__reservedmem_of_table) \
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+ = { .compatible = compat, \
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+ .data = (init == (reservedmem_of_init_fn)NULL) ? \
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+ init : init }
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+
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#else
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static inline void fdt_init_reserved_mem(void) { }
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static inline void fdt_reserved_mem_save_node(unsigned long node,
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const char *uname, phys_addr_t base, phys_addr_t size) { }
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+
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+#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
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+ static const struct of_device_id __reservedmem_of_table_##name \
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+ __attribute__((unused)) \
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+ = { .compatible = compat, \
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+ .data = (init == (reservedmem_of_init_fn)NULL) ? \
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+ init : init }
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+
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#endif
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#endif /* __OF_RESERVED_MEM_H */
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