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soc: apple: sart: Add SARTv0 support

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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>
This commit is contained in:
Nick Chan
2025-08-21 23:56:42 +08:00
committed by Sven Peter
parent 8409ebe2c3
commit a67677d4e2
1 changed files with 49 additions and 0 deletions
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49
drivers/soc/apple/sart.c
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@@ -25,6 +25,18 @@
#define APPLE_SART_MAX_ENTRIES 16
/* SARTv0 registers */
#define APPLE_SART0_CONFIG(idx) (0x00 + 4 * (idx))
#define APPLE_SART0_CONFIG_FLAGS GENMASK(28, 24)
#define APPLE_SART0_CONFIG_SIZE GENMASK(18, 0)
#define APPLE_SART0_CONFIG_SIZE_SHIFT 12
#define APPLE_SART0_CONFIG_SIZE_MAX GENMASK(18, 0)
#define APPLE_SART0_PADDR(idx) (0x40 + 4 * (idx))
#define APPLE_SART0_PADDR_SHIFT 12
#define APPLE_SART0_FLAGS_ALLOW 0xf
/* SARTv2 registers */
#define APPLE_SART2_CONFIG(idx) (0x00 + 4 * (idx))
#define APPLE_SART2_CONFIG_FLAGS GENMASK(31, 24)
@@ -71,6 +83,39 @@ struct apple_sart {
unsigned long used_entries;
};
static void sart0_get_entry(struct apple_sart *sart, int index, u8 *flags,
phys_addr_t *paddr, size_t *size)
{
u32 cfg = readl(sart->regs + APPLE_SART0_CONFIG(index));
phys_addr_t paddr_ = readl(sart->regs + APPLE_SART0_PADDR(index));
size_t size_ = FIELD_GET(APPLE_SART0_CONFIG_SIZE, cfg);
*flags = FIELD_GET(APPLE_SART0_CONFIG_FLAGS, cfg);
*size = size_ << APPLE_SART0_CONFIG_SIZE_SHIFT;
*paddr = paddr_ << APPLE_SART0_PADDR_SHIFT;
}
static void sart0_set_entry(struct apple_sart *sart, int index, u8 flags,
phys_addr_t paddr_shifted, size_t size_shifted)
{
u32 cfg;
cfg = FIELD_PREP(APPLE_SART0_CONFIG_FLAGS, flags);
cfg |= FIELD_PREP(APPLE_SART0_CONFIG_SIZE, size_shifted);
writel(paddr_shifted, sart->regs + APPLE_SART0_PADDR(index));
writel(cfg, sart->regs + APPLE_SART0_CONFIG(index));
}
static struct apple_sart_ops sart_ops_v0 = {
.get_entry = sart0_get_entry,
.set_entry = sart0_set_entry,
.flags_allow = APPLE_SART0_FLAGS_ALLOW,
.size_shift = APPLE_SART0_CONFIG_SIZE_SHIFT,
.paddr_shift = APPLE_SART0_PADDR_SHIFT,
.size_max = APPLE_SART0_CONFIG_SIZE_MAX,
};
static void sart2_get_entry(struct apple_sart *sart, int index, u8 *flags,
phys_addr_t *paddr, size_t *size)
{
@@ -319,6 +364,10 @@ static const struct of_device_id apple_sart_of_match[] = {
.compatible = "apple,t8103-sart",
.data = &sart_ops_v2,
},
{
.compatible = "apple,t8015-sart",
.data = &sart_ops_v0,
},
{}
};
MODULE_DEVICE_TABLE(of, apple_sart_of_match);