Commit a67677d4 authored by Nick Chan's avatar Nick Chan Committed by Sven Peter
Browse files

soc: apple: sart: Add SARTv0 support 



Add support for SARTv0 as found on Apple A11 SoC.

Reviewed-by: default avatarSven Peter <sven@kernel.org>
Signed-off-by: default avatarNick Chan <towinchenmi@gmail.com>
Link: https://lore.kernel.org/r/20250821-t8015-nvme-v3-5-14a4178adf68@gmail.com


Signed-off-by: default avatarSven Peter <sven@kernel.org>
parent 8409ebe2

drivers/soc/apple/sart.c

+49 −0
Original line number Diff line number Diff line
@@ -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);