Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
soc: apple: sart: Add SARTv0 support
Add support for SARTv0 as found on Apple A11 SoC.
Reviewed-by: Sven Peter <sven@kernel.org>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
Link: https://lore.kernel.org/r/20250821-t8015-nvme-v3-5-14a4178adf68@gmail.com
Signed-off-by: Sven Peter <sven@kernel.org>
authored by
Nick Chan
and committed by
Sven Peter
a67677d4
8409ebe2
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+49
drivers/soc/apple/sart.c
+49
drivers/soc/apple/sart.c
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#define APPLE_SART_MAX_ENTRIES 16
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/* SARTv0 registers */
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#define APPLE_SART0_CONFIG(idx) (0x00 + 4 * (idx))
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#define APPLE_SART0_CONFIG_FLAGS GENMASK(28, 24)
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#define APPLE_SART0_CONFIG_SIZE GENMASK(18, 0)
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#define APPLE_SART0_CONFIG_SIZE_SHIFT 12
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#define APPLE_SART0_CONFIG_SIZE_MAX GENMASK(18, 0)
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#define APPLE_SART0_PADDR(idx) (0x40 + 4 * (idx))
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#define APPLE_SART0_PADDR_SHIFT 12
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#define APPLE_SART0_FLAGS_ALLOW 0xf
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/* SARTv2 registers */
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#define APPLE_SART2_CONFIG(idx) (0x00 + 4 * (idx))
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#define APPLE_SART2_CONFIG_FLAGS GENMASK(31, 24)
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unsigned long protected_entries;
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unsigned long used_entries;
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};
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static void sart0_get_entry(struct apple_sart *sart, int index, u8 *flags,
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phys_addr_t *paddr, size_t *size)
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{
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u32 cfg = readl(sart->regs + APPLE_SART0_CONFIG(index));
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phys_addr_t paddr_ = readl(sart->regs + APPLE_SART0_PADDR(index));
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size_t size_ = FIELD_GET(APPLE_SART0_CONFIG_SIZE, cfg);
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*flags = FIELD_GET(APPLE_SART0_CONFIG_FLAGS, cfg);
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*size = size_ << APPLE_SART0_CONFIG_SIZE_SHIFT;
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*paddr = paddr_ << APPLE_SART0_PADDR_SHIFT;
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}
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static void sart0_set_entry(struct apple_sart *sart, int index, u8 flags,
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phys_addr_t paddr_shifted, size_t size_shifted)
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{
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u32 cfg;
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cfg = FIELD_PREP(APPLE_SART0_CONFIG_FLAGS, flags);
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cfg |= FIELD_PREP(APPLE_SART0_CONFIG_SIZE, size_shifted);
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writel(paddr_shifted, sart->regs + APPLE_SART0_PADDR(index));
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writel(cfg, sart->regs + APPLE_SART0_CONFIG(index));
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}
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static struct apple_sart_ops sart_ops_v0 = {
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.get_entry = sart0_get_entry,
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.set_entry = sart0_set_entry,
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.flags_allow = APPLE_SART0_FLAGS_ALLOW,
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.size_shift = APPLE_SART0_CONFIG_SIZE_SHIFT,
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.paddr_shift = APPLE_SART0_PADDR_SHIFT,
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.size_max = APPLE_SART0_CONFIG_SIZE_MAX,
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};
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static void sart2_get_entry(struct apple_sart *sart, int index, u8 *flags,
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{
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.compatible = "apple,t8103-sart",
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.data = &sart_ops_v2,
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},
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{
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.compatible = "apple,t8015-sart",
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.data = &sart_ops_v0,
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},
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{}
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};