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278 lines
5.5 KiB
278 lines
5.5 KiB
/* |
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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(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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/* 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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bus->dev = dev; |
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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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/* 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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