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authorMika Westerberg <mika.westerberg@linux.intel.com>2016-11-28 15:06:26 +0300
committerLee Jones <lee.jones@linaro.org>2017-01-03 17:34:16 +0000
commit87eb832ae9748fab00588b98c2e33e89de065438 (patch)
tree624bd7d0377b0266d79a83e790a05bea93adf3bd /drivers/mfd
parentff00d7a32a1b88b772981a13fc198e0d29300666 (diff)
downloadlinux-87eb832ae9748fab00588b98c2e33e89de065438.tar.bz2
mfd: lpc_ich: Add support for Intel Apollo Lake SoC
Intel Apollo Lake SoC exposes serial SPI flash through the LPC device. The SPI flash host controller is not discoverable through PCI config cycles because P2SB (function 0 of the device 13) is hidden by the BIOS. We unhide the device briefly in order to read BAR 0 of the SPI host controller. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/lpc_ich.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
index 985135828cfc..be42957a78e1 100644
--- a/drivers/mfd/lpc_ich.c
+++ b/drivers/mfd/lpc_ich.c
@@ -56,6 +56,7 @@
* document number TBD : Wildcat Point-LP
* document number TBD : 9 Series
* document number TBD : Lewisburg
+ * document number TBD : Apollo Lake SoC
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -92,6 +93,8 @@
#define BCR 0xdc
#define BCR_WPD BIT(0)
+#define SPIBASE_APL_SZ 4096
+
#define GPIOBASE_ICH0 0x58
#define GPIOCTRL_ICH0 0x5C
#define GPIOBASE_ICH6 0x48
@@ -239,6 +242,7 @@ enum lpc_chipsets {
LPC_BRASWELL, /* Braswell SoC */
LPC_LEWISBURG, /* Lewisburg */
LPC_9S, /* 9 Series */
+ LPC_APL, /* Apollo Lake SoC */
};
static struct lpc_ich_info lpc_chipset_info[] = {
@@ -561,6 +565,10 @@ static struct lpc_ich_info lpc_chipset_info[] = {
.iTCO_version = 2,
.gpio_version = ICH_V5_GPIO,
},
+ [LPC_APL] = {
+ .name = "Apollo Lake SoC",
+ .spi_type = INTEL_SPI_BXT,
+ },
};
/*
@@ -709,6 +717,7 @@ static const struct pci_device_id lpc_ich_ids[] = {
{ PCI_VDEVICE(INTEL, 0x3b14), LPC_3420},
{ PCI_VDEVICE(INTEL, 0x3b16), LPC_3450},
{ PCI_VDEVICE(INTEL, 0x5031), LPC_EP80579},
+ { PCI_VDEVICE(INTEL, 0x5ae8), LPC_APL},
{ PCI_VDEVICE(INTEL, 0x8c40), LPC_LPT},
{ PCI_VDEVICE(INTEL, 0x8c41), LPC_LPT},
{ PCI_VDEVICE(INTEL, 0x8c42), LPC_LPT},
@@ -1128,6 +1137,36 @@ static int lpc_ich_init_spi(struct pci_dev *dev)
}
break;
+ case INTEL_SPI_BXT: {
+ unsigned int p2sb = PCI_DEVFN(13, 0);
+ unsigned int spi = PCI_DEVFN(13, 2);
+ struct pci_bus *bus = dev->bus;
+
+ /*
+ * The P2SB is hidden by BIOS and we need to unhide it in
+ * order to read BAR of the SPI flash device. Once that is
+ * done we hide it again.
+ */
+ pci_bus_write_config_byte(bus, p2sb, 0xe1, 0x0);
+ pci_bus_read_config_dword(bus, spi, PCI_BASE_ADDRESS_0,
+ &spi_base);
+ if (spi_base != ~0) {
+ res->start = spi_base & 0xfffffff0;
+ res->end = res->start + SPIBASE_APL_SZ - 1;
+
+ pci_bus_read_config_dword(bus, spi, BCR, &bcr);
+ if (!(bcr & BCR_WPD)) {
+ bcr |= BCR_WPD;
+ pci_bus_write_config_dword(bus, spi, BCR, bcr);
+ pci_bus_read_config_dword(bus, spi, BCR, &bcr);
+ }
+ info->writeable = !!(bcr & BCR_WPD);
+ }
+
+ pci_bus_write_config_byte(bus, p2sb, 0xe1, 0x1);
+ break;
+ }
+
default:
return -EINVAL;
}