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![Rafał Miłecki](/assets/img/avatar_default.png)
Starting with kernel 3.19-rc1 early registration of bcma on MIPS is done a bit later, with memory allocator available. This allows us to simplify code by using standard bus scanning method. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
278 lines
5.5 KiB
C
278 lines
5.5 KiB
C
/*
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* Broadcom specific AMBA
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* System on Chip (SoC) Host
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include "bcma_private.h"
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#include "scan.h"
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/bcma/bcma.h>
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#include <linux/bcma/bcma_soc.h>
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static u8 bcma_host_soc_read8(struct bcma_device *core, u16 offset)
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{
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return readb(core->io_addr + offset);
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}
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static u16 bcma_host_soc_read16(struct bcma_device *core, u16 offset)
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{
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return readw(core->io_addr + offset);
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}
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static u32 bcma_host_soc_read32(struct bcma_device *core, u16 offset)
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{
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return readl(core->io_addr + offset);
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}
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static void bcma_host_soc_write8(struct bcma_device *core, u16 offset,
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u8 value)
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{
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writeb(value, core->io_addr + offset);
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}
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static void bcma_host_soc_write16(struct bcma_device *core, u16 offset,
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u16 value)
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{
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writew(value, core->io_addr + offset);
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}
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static void bcma_host_soc_write32(struct bcma_device *core, u16 offset,
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u32 value)
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{
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writel(value, core->io_addr + offset);
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}
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#ifdef CONFIG_BCMA_BLOCKIO
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static void bcma_host_soc_block_read(struct bcma_device *core, void *buffer,
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size_t count, u16 offset, u8 reg_width)
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{
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void __iomem *addr = core->io_addr + offset;
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switch (reg_width) {
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case sizeof(u8): {
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u8 *buf = buffer;
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while (count) {
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*buf = __raw_readb(addr);
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buf++;
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count--;
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}
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break;
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}
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case sizeof(u16): {
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__le16 *buf = buffer;
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WARN_ON(count & 1);
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while (count) {
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*buf = (__force __le16)__raw_readw(addr);
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buf++;
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count -= 2;
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}
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break;
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}
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case sizeof(u32): {
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__le32 *buf = buffer;
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WARN_ON(count & 3);
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while (count) {
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*buf = (__force __le32)__raw_readl(addr);
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buf++;
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count -= 4;
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}
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break;
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}
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default:
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WARN_ON(1);
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}
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}
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static void bcma_host_soc_block_write(struct bcma_device *core,
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const void *buffer,
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size_t count, u16 offset, u8 reg_width)
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{
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void __iomem *addr = core->io_addr + offset;
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switch (reg_width) {
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case sizeof(u8): {
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const u8 *buf = buffer;
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while (count) {
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__raw_writeb(*buf, addr);
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buf++;
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count--;
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}
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break;
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}
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case sizeof(u16): {
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const __le16 *buf = buffer;
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WARN_ON(count & 1);
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while (count) {
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__raw_writew((__force u16)(*buf), addr);
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buf++;
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count -= 2;
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}
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break;
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}
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case sizeof(u32): {
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const __le32 *buf = buffer;
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WARN_ON(count & 3);
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while (count) {
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__raw_writel((__force u32)(*buf), addr);
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buf++;
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count -= 4;
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}
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break;
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}
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default:
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WARN_ON(1);
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}
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}
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#endif /* CONFIG_BCMA_BLOCKIO */
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static u32 bcma_host_soc_aread32(struct bcma_device *core, u16 offset)
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{
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if (WARN_ONCE(!core->io_wrap, "Accessed core has no wrapper/agent\n"))
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return ~0;
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return readl(core->io_wrap + offset);
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}
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static void bcma_host_soc_awrite32(struct bcma_device *core, u16 offset,
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u32 value)
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{
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if (WARN_ONCE(!core->io_wrap, "Accessed core has no wrapper/agent\n"))
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return;
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writel(value, core->io_wrap + offset);
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}
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static const struct bcma_host_ops bcma_host_soc_ops = {
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.read8 = bcma_host_soc_read8,
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.read16 = bcma_host_soc_read16,
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.read32 = bcma_host_soc_read32,
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.write8 = bcma_host_soc_write8,
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.write16 = bcma_host_soc_write16,
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.write32 = bcma_host_soc_write32,
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#ifdef CONFIG_BCMA_BLOCKIO
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.block_read = bcma_host_soc_block_read,
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.block_write = bcma_host_soc_block_write,
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#endif
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.aread32 = bcma_host_soc_aread32,
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.awrite32 = bcma_host_soc_awrite32,
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};
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int __init bcma_host_soc_register(struct bcma_soc *soc)
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{
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struct bcma_bus *bus = &soc->bus;
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/* iomap only first core. We have to read some register on this core
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* to scan the bus.
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*/
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bus->mmio = ioremap_nocache(BCMA_ADDR_BASE, BCMA_CORE_SIZE * 1);
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if (!bus->mmio)
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return -ENOMEM;
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/* Host specific */
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bus->hosttype = BCMA_HOSTTYPE_SOC;
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bus->ops = &bcma_host_soc_ops;
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bus->host_pdev = NULL;
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/* Initialize struct, detect chip */
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bcma_init_bus(bus);
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return 0;
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}
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int __init bcma_host_soc_init(struct bcma_soc *soc)
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{
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struct bcma_bus *bus = &soc->bus;
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int err;
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/* Scan bus and initialize it */
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err = bcma_bus_early_register(bus);
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if (err)
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iounmap(bus->mmio);
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return err;
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}
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#ifdef CONFIG_OF
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static int bcma_host_soc_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct bcma_bus *bus;
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int err;
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/* Alloc */
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bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
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if (!bus)
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return -ENOMEM;
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/* Map MMIO */
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bus->mmio = of_iomap(np, 0);
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if (!bus->mmio)
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return -ENOMEM;
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/* Host specific */
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bus->hosttype = BCMA_HOSTTYPE_SOC;
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bus->ops = &bcma_host_soc_ops;
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bus->host_pdev = pdev;
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/* Initialize struct, detect chip */
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bcma_init_bus(bus);
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/* Register */
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err = bcma_bus_register(bus);
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if (err)
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goto err_unmap_mmio;
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platform_set_drvdata(pdev, bus);
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return err;
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err_unmap_mmio:
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iounmap(bus->mmio);
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return err;
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}
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static int bcma_host_soc_remove(struct platform_device *pdev)
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{
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struct bcma_bus *bus = platform_get_drvdata(pdev);
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bcma_bus_unregister(bus);
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iounmap(bus->mmio);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static const struct of_device_id bcma_host_soc_of_match[] = {
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{ .compatible = "brcm,bus-axi", },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcma_host_soc_of_match);
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static struct platform_driver bcma_host_soc_driver = {
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.driver = {
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.name = "bcma-host-soc",
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.of_match_table = bcma_host_soc_of_match,
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},
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.probe = bcma_host_soc_probe,
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.remove = bcma_host_soc_remove,
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};
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int __init bcma_host_soc_register_driver(void)
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{
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return platform_driver_register(&bcma_host_soc_driver);
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}
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void __exit bcma_host_soc_unregister_driver(void)
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{
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platform_driver_unregister(&bcma_host_soc_driver);
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}
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#endif /* CONFIG_OF */
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