106 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3** hppb.c:4** HP-PB bus driver for the NOVA and K-Class systems.5**6** (c) Copyright 2002 Ryan Bradetich7** (c) Copyright 2002 Hewlett-Packard Company8**9**10*/11 12#include <linux/types.h>13#include <linux/init.h>14#include <linux/mm.h>15#include <linux/slab.h>16#include <linux/dma-mapping.h>17#include <linux/ioport.h>18 19#include <asm/io.h>20#include <asm/hardware.h>21#include <asm/parisc-device.h>22 23#include "iommu.h"24 25struct hppb_card {26 unsigned long hpa;27 struct resource mmio_region;28 struct hppb_card *next;29};30 31static struct hppb_card hppb_card_head = {32 .hpa = 0,33 .next = NULL,34};35 36#define IO_IO_LOW offsetof(struct bc_module, io_io_low)37#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)38 39/**40 * hppb_probe - Determine if the hppb driver should claim this device.41 * @dev: The device which has been found42 *43 * Determine if hppb driver should claim this chip (return 0) or not 44 * (return 1). If so, initialize the chip and tell other partners in crime 45 * they have work to do.46 */47static int __init hppb_probe(struct parisc_device *dev)48{49 int status;50 struct hppb_card *card = &hppb_card_head;51 52 while(card->next) {53 card = card->next;54 }55 56 if(card->hpa) {57 card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);58 if(!card->next) {59 printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");60 return 1;61 }62 card = card->next;63 }64 65 card->hpa = dev->hpa.start;66 card->mmio_region.name = "HP-PB Bus";67 card->mmio_region.flags = IORESOURCE_MEM;68 69 card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);70 card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;71 72 status = ccio_request_resource(dev, &card->mmio_region);73 74 pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.\n",75 &dev->hpa.start,76 &card->mmio_region,77 (status < 0) ? " not":"" );78 79 return 0;80}81 82static const struct parisc_device_id hppb_tbl[] __initconst = {83 { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */84 { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */85 { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */86 { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */87 { 0, }88};89 90static struct parisc_driver hppb_driver __refdata = {91 .name = "gecko_boa",92 .id_table = hppb_tbl,93 .probe = hppb_probe,94};95 96/**97 * hppb_init - HP-PB bus initialization procedure.98 *99 * Register this driver.100 */101static int __init hppb_init(void)102{103 return register_parisc_driver(&hppb_driver);104}105arch_initcall(hppb_init);106