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drkaiser: restore flash writing access state explicitly

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Instead of using reversible write (rpci_write_word) that relies on
global state, do it manually. Save original PCI config space
register contents to programmer's structure during initialization
and restore it in programmer's shutdown.

TOPIC=reduce_global_pci_state
TEST=builds

Change-Id: Ie99a7cb3e049b29e6838dd4af587eee8c3b18919
Signed-off-by: Alexander Goncharov <chat@joursoir.net>
Ticket: https://ticket.coreboot.org/issues/389
Reviewed-on: https://review.coreboot.org/c/flashrom/+/66838
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
This commit is contained in:
Alexander Goncharov 2022-08-17 20:56:43 +03:00 committed by Anastasia Klimchuk
parent 66b34f8ba3
commit 1d38651865
1 changed files with 12 additions and 3 deletions
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15
drkaiser.c
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@ -31,7 +31,9 @@
#define DRKAISER_MEMMAP_MASK ((1 << 17) - 1)
struct drkaiser_data {
struct pci_dev *dev;
uint8_t *bar;
uint16_t flash_access;
};
static const struct dev_entry drkaiser_pcidev[] = {
@ -58,6 +60,11 @@ static uint8_t drkaiser_chip_readb(const struct flashctx *flash,
static int drkaiser_shutdown(void *par_data)
{
struct drkaiser_data *data = par_data;
/* Restore original flash writing state. */
pci_write_word(data->dev, PCI_MAGIC_DRKAISER_ADDR, data->flash_access);
free(par_data);
return 0;
}
@ -88,9 +95,6 @@ static int drkaiser_init(void)
if (!addr)
return 1;
/* Write magic register to enable flash write. */
rpci_write_word(dev, PCI_MAGIC_DRKAISER_ADDR, PCI_MAGIC_DRKAISER_VALUE);
/* Map 128kB flash memory window. */
bar = rphysmap("Dr. Kaiser PC-Waechter flash memory", addr, DRKAISER_MEMMAP_SIZE);
if (bar == ERROR_PTR)
@ -101,8 +105,13 @@ static int drkaiser_init(void)
msg_perr("Unable to allocate space for PAR master data\n");
return 1;
}
data->dev = dev;
data->bar = bar;
/* Write magic register to enable flash write. */
data->flash_access = pci_read_word(dev, PCI_MAGIC_DRKAISER_ADDR);
pci_write_word(dev, PCI_MAGIC_DRKAISER_ADDR, PCI_MAGIC_DRKAISER_VALUE);
max_rom_decode.parallel = 128 * 1024;
return register_par_master(&par_master_drkaiser, BUS_PARALLEL, data);