From 8369ae33b705222aa05ab53c7d6b4458f4ed161b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Mon, 9 May 2011 18:56:46 +0200 Subject: bcma: add Broadcom specific AMBA bus driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Broadcom has released cards based on a new AMBA-based bus type. From a programming point of view, this new bus type differs from AMBA and does not use AMBA common registers. It also differs enough from SSB. We decided that a new bus driver is needed to keep the code clean. In its current form, the driver detects devices present on the bus and registers them in the system. It allows registering BCMA drivers for specified bus devices and provides them basic operations. The bus driver itself includes two important bus managing drivers: ChipCommon core driver and PCI(c) core driver. They are early used to allow correct initialization. Currently code is limited to supporting buses on PCI(e) devices, however the driver is designed to be used also on other hosts. The host abstraction layer is implemented and already used for PCI(e). Support for PCI(e) hosts is working and seems to be stable (access to 80211 core was tested successfully on a few devices). We can still optimize it by using some fixed windows, but this can be done later without affecting any external code. Windows are just ranges in MMIO used for accessing cores on the bus. Cc: Greg KH Cc: Michael Büsch Cc: Larry Finger Cc: George Kashperko Cc: Arend van Spriel Cc: linux-arm-kernel@lists.infradead.org Cc: Russell King Cc: Arnd Bergmann Cc: Andy Botting Cc: linuxdriverproject Cc: linux-kernel@vger.kernel.org Signed-off-by: Rafał Miłecki Signed-off-by: John W. Linville --- drivers/bcma/driver_pci.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 drivers/bcma/driver_pci.c (limited to 'drivers/bcma/driver_pci.c') diff --git a/drivers/bcma/driver_pci.c b/drivers/bcma/driver_pci.c new file mode 100644 index 000000000000..b98b8359bef5 --- /dev/null +++ b/drivers/bcma/driver_pci.c @@ -0,0 +1,163 @@ +/* + * Broadcom specific AMBA + * PCI Core + * + * Copyright 2005, Broadcom Corporation + * Copyright 2006, 2007, Michael Buesch + * + * Licensed under the GNU/GPL. See COPYING for details. + */ + +#include "bcma_private.h" +#include + +/************************************************** + * R/W ops. + **************************************************/ + +static u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address) +{ + pcicore_write32(pc, 0x130, address); + pcicore_read32(pc, 0x130); + return pcicore_read32(pc, 0x134); +} + +#if 0 +static void bcma_pcie_write(struct bcma_drv_pci *pc, u32 address, u32 data) +{ + pcicore_write32(pc, 0x130, address); + pcicore_read32(pc, 0x130); + pcicore_write32(pc, 0x134, data); +} +#endif + +static void bcma_pcie_mdio_set_phy(struct bcma_drv_pci *pc, u8 phy) +{ + const u16 mdio_control = 0x128; + const u16 mdio_data = 0x12C; + u32 v; + int i; + + v = (1 << 30); /* Start of Transaction */ + v |= (1 << 28); /* Write Transaction */ + v |= (1 << 17); /* Turnaround */ + v |= (0x1F << 18); + v |= (phy << 4); + pcicore_write32(pc, mdio_data, v); + + udelay(10); + for (i = 0; i < 200; i++) { + v = pcicore_read32(pc, mdio_control); + if (v & 0x100 /* Trans complete */) + break; + msleep(1); + } +} + +static u16 bcma_pcie_mdio_read(struct bcma_drv_pci *pc, u8 device, u8 address) +{ + const u16 mdio_control = 0x128; + const u16 mdio_data = 0x12C; + int max_retries = 10; + u16 ret = 0; + u32 v; + int i; + + v = 0x80; /* Enable Preamble Sequence */ + v |= 0x2; /* MDIO Clock Divisor */ + pcicore_write32(pc, mdio_control, v); + + if (pc->core->id.rev >= 10) { + max_retries = 200; + bcma_pcie_mdio_set_phy(pc, device); + } + + v = (1 << 30); /* Start of Transaction */ + v |= (1 << 29); /* Read Transaction */ + v |= (1 << 17); /* Turnaround */ + if (pc->core->id.rev < 10) + v |= (u32)device << 22; + v |= (u32)address << 18; + pcicore_write32(pc, mdio_data, v); + /* Wait for the device to complete the transaction */ + udelay(10); + for (i = 0; i < 200; i++) { + v = pcicore_read32(pc, mdio_control); + if (v & 0x100 /* Trans complete */) { + udelay(10); + ret = pcicore_read32(pc, mdio_data); + break; + } + msleep(1); + } + pcicore_write32(pc, mdio_control, 0); + return ret; +} + +static void bcma_pcie_mdio_write(struct bcma_drv_pci *pc, u8 device, + u8 address, u16 data) +{ + const u16 mdio_control = 0x128; + const u16 mdio_data = 0x12C; + int max_retries = 10; + u32 v; + int i; + + v = 0x80; /* Enable Preamble Sequence */ + v |= 0x2; /* MDIO Clock Divisor */ + pcicore_write32(pc, mdio_control, v); + + if (pc->core->id.rev >= 10) { + max_retries = 200; + bcma_pcie_mdio_set_phy(pc, device); + } + + v = (1 << 30); /* Start of Transaction */ + v |= (1 << 28); /* Write Transaction */ + v |= (1 << 17); /* Turnaround */ + if (pc->core->id.rev < 10) + v |= (u32)device << 22; + v |= (u32)address << 18; + v |= data; + pcicore_write32(pc, mdio_data, v); + /* Wait for the device to complete the transaction */ + udelay(10); + for (i = 0; i < max_retries; i++) { + v = pcicore_read32(pc, mdio_control); + if (v & 0x100 /* Trans complete */) + break; + msleep(1); + } + pcicore_write32(pc, mdio_control, 0); +} + +/************************************************** + * Workarounds. + **************************************************/ + +static u8 bcma_pcicore_polarity_workaround(struct bcma_drv_pci *pc) +{ + return (bcma_pcie_read(pc, 0x204) & 0x10) ? 0xC0 : 0x80; +} + +static void bcma_pcicore_serdes_workaround(struct bcma_drv_pci *pc) +{ + const u8 serdes_pll_device = 0x1D; + const u8 serdes_rx_device = 0x1F; + u16 tmp; + + bcma_pcie_mdio_write(pc, serdes_rx_device, 1 /* Control */, + bcma_pcicore_polarity_workaround(pc)); + tmp = bcma_pcie_mdio_read(pc, serdes_pll_device, 1 /* Control */); + if (tmp & 0x4000) + bcma_pcie_mdio_write(pc, serdes_pll_device, 1, tmp & ~0x4000); +} + +/************************************************** + * Init. + **************************************************/ + +void bcma_core_pci_init(struct bcma_drv_pci *pc) +{ + bcma_pcicore_serdes_workaround(pc); +} -- cgit v1.2.3 From f1a9c1e694f84938e6526590d23e88a791a8069f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Thu, 12 May 2011 00:01:47 +0200 Subject: bcma: pci: trivial: correct amount of maximum retries MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rafał Miłecki Signed-off-by: John W. Linville --- drivers/bcma/driver_pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/bcma/driver_pci.c') diff --git a/drivers/bcma/driver_pci.c b/drivers/bcma/driver_pci.c index b98b8359bef5..e757e4e3c7e2 100644 --- a/drivers/bcma/driver_pci.c +++ b/drivers/bcma/driver_pci.c @@ -81,7 +81,7 @@ static u16 bcma_pcie_mdio_read(struct bcma_drv_pci *pc, u8 device, u8 address) pcicore_write32(pc, mdio_data, v); /* Wait for the device to complete the transaction */ udelay(10); - for (i = 0; i < 200; i++) { + for (i = 0; i < max_retries; i++) { v = pcicore_read32(pc, mdio_control); if (v & 0x100 /* Trans complete */) { udelay(10); -- cgit v1.2.3