brcmfmac: expose device memory to devcoredump subsystem

Upon PSM watchdog event received from firmware the driver will obtain
a memory snapshot of the device and expose it to user-space through
the devcoredump framework. This will trigger a uevent.

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/brcm80211/brcmfmac/pcie.c
index 30baf352e234..36b386a000ca 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/pcie.c
@@ -448,6 +448,47 @@ brcmf_pcie_copy_mem_todev(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
 }
 
 
+static void
+brcmf_pcie_copy_dev_tomem(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
+			  void *dstaddr, u32 len)
+{
+	void __iomem *address = devinfo->tcm + mem_offset;
+	__le32 *dst32;
+	__le16 *dst16;
+	u8 *dst8;
+
+	if (((ulong)address & 4) || ((ulong)dstaddr & 4) || (len & 4)) {
+		if (((ulong)address & 2) || ((ulong)dstaddr & 2) || (len & 2)) {
+			dst8 = (u8 *)dstaddr;
+			while (len) {
+				*dst8 = ioread8(address);
+				address++;
+				dst8++;
+				len--;
+			}
+		} else {
+			len = len / 2;
+			dst16 = (__le16 *)dstaddr;
+			while (len) {
+				*dst16 = cpu_to_le16(ioread16(address));
+				address += 2;
+				dst16++;
+				len--;
+			}
+		}
+	} else {
+		len = len / 4;
+		dst32 = (__le32 *)dstaddr;
+		while (len) {
+			*dst32 = cpu_to_le32(ioread32(address));
+			address += 4;
+			dst32++;
+			len--;
+		}
+	}
+}
+
+
 #define WRITECC32(devinfo, reg, value) brcmf_pcie_write_reg32(devinfo, \
 		CHIPCREGOFFS(reg), value)
 
@@ -1352,12 +1393,36 @@ static void brcmf_pcie_wowl_config(struct device *dev, bool enabled)
 }
 
 
+static size_t brcmf_pcie_get_ramsize(struct device *dev)
+{
+	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
+	struct brcmf_pciedev *buspub = bus_if->bus_priv.pcie;
+	struct brcmf_pciedev_info *devinfo = buspub->devinfo;
+
+	return devinfo->ci->ramsize - devinfo->ci->srsize;
+}
+
+
+static int brcmf_pcie_get_memdump(struct device *dev, void *data, size_t len)
+{
+	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
+	struct brcmf_pciedev *buspub = bus_if->bus_priv.pcie;
+	struct brcmf_pciedev_info *devinfo = buspub->devinfo;
+
+	brcmf_dbg(PCIE, "dump at 0x%08X: len=%zu\n", devinfo->ci->rambase, len);
+	brcmf_pcie_copy_dev_tomem(devinfo, devinfo->ci->rambase, data, len);
+	return 0;
+}
+
+
 static struct brcmf_bus_ops brcmf_pcie_bus_ops = {
 	.txdata = brcmf_pcie_tx,
 	.stop = brcmf_pcie_down,
 	.txctl = brcmf_pcie_tx_ctlpkt,
 	.rxctl = brcmf_pcie_rx_ctlpkt,
 	.wowl_config = brcmf_pcie_wowl_config,
+	.get_ramsize = brcmf_pcie_get_ramsize,
+	.get_memdump = brcmf_pcie_get_memdump,
 };